Distilleries are important to India’s beverage and ethanol industries. They produce everything from high-quality spirits to the fuel-grade ethanol used in the country’s bioethanol blending program. These operations promote economic growth, support renewable energy, and provide crucial help to rural communities. However, there is a challenge that worries both local communities and regulators. It involves the strong odours that often come from distillery operations.
Fermentation processes spent wash handling, storage, and effluent treatment plants release strong, unpleasant smells that can travel far beyond the factory walls. These odours not only affect worker comfort and community health but also attract regulatory complaints and damage brand reputation. Despite their seriousness, odour issues are often overlooked in favour of more visible measures like wastewater treatment or Zero Liquid Discharge (ZLD).
This is something that Elixir Enviro Systems can provide a difference—assisting distilleries deal with odour issues through sustainable, efficient outcomes.
In this blog, we’ll explore:
By the end, you’ll see why odour control is not just a regulatory requirement but a strategic investment—and how Elixir Enviro Systems can help distilleries turn this challenge into a sustainable advantage.
The characteristic smells from distilleries mainly come from the breakdown of organic matter, fermentation processes, and chemical reactions that happen during alcohol production. How strong and long-lasting these odours are often depends on the type of raw materials used, how by-products are handled, and the management of waste streams like spent wash.
Several compounds are responsible for the characteristic “distillery smell”:
Compared to grain-based plants, molasses-based distilleries are typically far more odour-intensive. One cause is being the handling of by products and wastewater, and is mainly due to:
While grain-based distilleries also emit odours, their effluents are easier to treat, making emissions comparatively less intense.
Odour generation occurs at multiple points in the production process. Key sources include:
1 Fermentation Tanks
Fermentation releases carbon dioxide mixed with ethanol vapours, aldehydes, and fusel oils, producing noticeable solvent-like odours around tanks.
2 Distillation Units
Distillation strips VOCs and fusel oils from the process stream. If gases from condensers and vents are not captured, they lead to strong odour emissions.
3 Spent Wash Lagoons
The single biggest source of odour in distilleries. Anaerobic decomposition of spent wash continuously releases foul gases such as hydrogen sulphide and volatile fatty acids.
4 Sludge Drying and Handling
Sludge rich in organics emits hydrogen sulphide, ammonia, and amines during drying, storage, or handling. Without proper management, this becomes a persistent odour source.
5 By-Products and Residues
By-products like press mud, compost, and distillers dried grains with solubles (DDGS) can produce strong odours if not stored properly. This adds to the overall odour issue.
Odour management is no longer just an environmental best practice—it is increasingly linked to regulatory compliance and social acceptance. Both Indian and global frameworks are tightening their expectations for distilleries to actively control odour emissions.
Across the world, environmental regulators are moving beyond traditional emission-based limits and focusing more on how industrial operations affect surrounding communities. For distilleries, this means that simply meeting emission standards may no longer be enough. If odour complaints persist, authorities can still impose penalties, restrict operations, or require the adoption of advanced odour control technologies.
Effective odour management depends on measuring and tracking emissions. Distilleries are adopting both traditional and advanced monitoring tools to ensure transparency and compliance.
Distilleries worldwide have implemented innovative odour control strategies that Indian plants can adapt to remain competitive and sustainable:
For Indian distilleries, adopting these proven practices can not only resolve local odour issues but also align operations with global sustainability benchmarks.
Managing odour in distilleries requires a combination of technologies and operational best practices. No single solution works in isolation; instead, a carefully designed system ensures compliance, efficiency, and community acceptance.
The most effective odour management plan is multi-pronged—combining biological, chemical, process-level, and monitoring solutions tailored to site-specific needs.
Odour management is more than just an operational requirement—it’s an important part of a distillery’s Environmental, Social, and Governance (ESG) performance. By investing in advanced odour control technologies, distilleries show their commitment to sustainability, transparency, and creating long-term value for both the business and the communities around them.
By implementing advanced odour control systems, distilleries can improve their ESG ratings, making themselves more attractive to investors, global partners, and eco-conscious consumers.
At Elixir Enviro Systems (EES), we specialise in delivering end-to-end odour control solutions for distilleries, combining technical innovation with sustainability. Our approach is tailored to each facility, ensuring compliance, efficiency, and long-term reliability.
Our expertise includes:
With over a million m³/hr air treatment capacity delivered across industries, Elixir helps distilleries not just manage odour but turn it into an opportunity for sustainability, community acceptance, and ESG leadership.
Odour control in distilleries goes far beyond regulatory compliance — it reflects a sense of responsibility, sustainability, and long-term competitiveness. When odours from fermentation, distillation, and spent wash lagoons are left unchecked, they can weaken community trust, invite regulatory action, and harm a distillery’s reputation.
By adopting modern technologies such as anaerobic digestion, biofiltration, scrubbing systems, and Zero Liquid Discharge (ZLD), distilleries can turn odour management from an operational burden into a strategic opportunity — improving environmental performance while building stronger relationships with the communities they serve.
Through an ESG perspective, odour control delivers triple benefits:
Distilleries that prioritise odour management today will not only stay ahead of tightening regulations but also build stronger market positions, healthier communities, and greater investor confidence—emerging as truly future-ready businesses.
Q1. Why do distilleries produce such strong odours?
Distilleries generate strong odours mainly due to the breakdown of organic materials during processes like fermentation, distillation, and effluent treatment. Gases such as hydrogen sulphide (H₂S), volatile fatty acids (VFAs), and volatile organic compounds (VOCs) are the key culprits behind these unpleasant smells.
Q2. What is the biggest source of odour in distilleries?
The single largest source is spent wash lagoons, where untreated effluent decomposes anaerobically, releasing foul-smelling gases such as H₂S, ammonia, and VFAs
Q3. How can distilleries effectively control odours?
A multi-pronged approach works best—combining biological systems (biofilters, biotrickling filters), chemical/physical systems (scrubbers, activated carbon), and process optimisation (anaerobic digestion, covered lagoons).
Q4. What are the regulatory requirements for odour control in Indian distilleries?
The CPCB mandates Zero Liquid Discharge (ZLD) for molasses-based distilleries. In addition, State Pollution Control Boards (SPCBs) can act on community complaints, sometimes halting operations until corrective measures are taken.
Q5. How does odour control improve ESG performance?
Odour management reduces harmful emissions (Environmental), protects workers and nearby communities (Social), and ensures transparent compliance with norms (Governance)—boosting overall ESG ratings
Slaughterhouse and chicken waste rendering plants are integral to managing by-products from the meat and poultry processing industries in India, one of the largest meat producers and exporters in the world. With an export valuation of 2.89 billion USD in 2020 and 1,176 slaughterhouses alongside 75 modern abattoirs, India generates substantial waste, including high volumes of poultry processing waste because of the high demand for chicken. Rendering plants process these wastes into valuable products, but they produce malodorous emissions that pose environmental and public health challenges. This Blog explains the procedure of slaughterhouse and chicken waste rendering, odourous compounds in exhaust gases, world odour control practices, individual and combined odour control units, biological methods, and the advantages, disadvantages, and issues of having rendering plants near slaughterhouses, particularly collection of waste from small-scale slaughterhouses in India.
The rendering process changes waste from slaughterhouses and chickens, such as inedible animal tissues (organs, bones, blood, feathers, offal, and poultry-specific materials like heads, feet, and viscera), into stable products like animal feed, fertilizers, or industrial materials.
In a rendering plant, the process begins from the collection and transportation of raw waste to the plant. The raw waste is subsequently cooked at high heat (usually 115–145°C) to separate fats, remove moisture, and eliminate pathogens. Grinding, screening, and pressing follow for the production of products such as meat and bone meal, poultry meal, feather meal, or tallow. Chicken waste rendering is supplemented with other processes to render feathers, which are hydrolyzed under pressure for the breakdown of keratin into digestible protein to create feed. Cooking and drying processes, especially for poultry waste with high protein and moisture content, create high gaseous emissions, responsible for the odour problem. Rendering is a common practice in India but the energy-intensive process and inadequate odour control are responsible for environmental problems, particularly in poultry-dominated areas.
Slaughterhouse and chicken waste rendering Exhaust gas is a mixture of volatile organic compounds (VOCs) and inorganic compounds which generate malodours. The primary odourous compounds are:
Rendering plant exhaust gases have high temperatures (cooking), high water content (poultry waste with 60–70% water), and badly soluble parts, so they are difficult to treat odour. Poultry rendering, particularly feather hydrolysis, produces unique odours due to sulfur-rich keratin breakdown. Volatile compounds in India’s warm climate are enhanced causing an increase in odour intensity and dispersion.
Globally, rendering plants for slaughterhouse and chicken waste employ diverse odour control technologies tailored to exhaust gas characteristics and regulatory requirements. Common practices include:
In the Netherlands and Germany, biofiltration is the best available control technology, achieving up to 90% odour reduction since the 1960s. American meat rendering facilities use thermal oxidizers and wet scrubbers to meet strict emission standards. This is especially important in poultry processing facilities that deal with large amounts of feathers and offal.
Combinations enhance efficiency for the diverse odorous compounds in slaughterhouse and chicken waste rendering exhaust:
Biotechniques are of special significance in India because they are economical and environmentally friendly. Microbial degradation is the basis of biofiltration, biotrickling filters, and bioscrubbers producing minimal secondary waste. Considerations are important:
The most important factor in any treatment plant is the correct engineering of the treatment unit. In a majority of the instances, it has been observed that the plants will have some kind of odour control units but are highly undersized and are not fulfilling its intention. It involves designing a system with correct control and monitoring system.
Advantages:
Disadvantages:
Challenges:
In India, small-scale slaughterhouses, especially poultry units, are common. Centralized rendering plants that collect waste from several facilities can work, but they have some challenges:
Feasibility Factors:
Challenges:
At Elixir Enviro Systems (EES), we recognise that odour from slaughterhouses and poultry waste rendering plants is one of the most pressing challenges for the industry. Emissions of hydrogen sulfide (H₂S), ammonia (NH₃), volatile fatty acids, and feather-processing VOCs not only lead to strong community complaints but also expose operators to strict regulatory action under CPCB and SPCB norms.
To address these challenges, EES provides customised odour control solutions designed specifically for the unique conditions of Indian slaughterhouses and poultry rendering facilities.
Advanced Biological Odour Control
Hybrid Systems for Complex Emissions
Pilot Studies & Onsite Assessment
Waste-to-Energy Integration
At Elixir Enviro Systems, our goal is to transform odour challenges into sustainable opportunities. By combining engineering precision with biological expertise, we help slaughterhouse and poultry rendering plants across India achieve cleaner operations, regulatory compliance, and improved community wellbeing.
Odour control in chicken waste-rendering and slaughterhouse facilities is crucial in India, which has a large poultry and meat industry. Rendering, cooking at high temperatures, and feather hydrolysis generates odorous compounds like H₂S, methanethiol, ammonia, and VOCs, with high sulfur and moisture content of poultry waste. Global practices, including biofiltration, activated carbon adsorption, and thermal oxidation, offer effective solutions, with biological methods being cost-effective for India. Hybrid systems are cost-effective but have the disadvantages of high cost and maintenance. Remote rendering plants reduce community impact but have transport cost, particularly for small poultry slaughterhouses. Centralized plants receiving waste from multiple facilities are feasible with good logistics and subsidies.
1. Why do rendering plants smell so bad?
Rendering Plants also releases pungent volatile gases like hydrogen sulfide, ammonia, and volatile fatty acids from decomposing animal and poultry waste. Feathers, blood, and viscera create especially strong odours.
2. Which odour control method works best for poultry waste in India?
Biological systems like biotrickling filters and biofilters are the most efficient and affordable for India. They can remove up to 90% of the odour if designed properly.
3. Can odour control in rendering plants also reduce pollution?
Yes. Many odour control systems also capture VOCs and harmful gases, improving air quality and reducing environmental pollution.
4. Why is it difficult to manage poultry waste odours in India?
India’s hot climate accelerates decomposition, small slaughterhouses lack resources, and many odour control systems are undersized or poorly maintained.
5. What are the benefits of centralised rendering plants?
They allow advanced odour control, support the circular economy by producing biogas and organic fertilizer, and reduce illegal dumping of poultry waste.
Municipal solid waste (MSW) composting is an important way to manage the large amount of organic waste in India, where organic matter makes up 60 to 70% of total waste. This process turns organic materials into nutrient-rich compost, providing a sustainable waste management option. However, composting produces smelly compounds that can create environmental and public health issues, especially in India’s crowded urban areas. The use of mechanical equipment like trommels, belt conveyors, and large reception pits in Indian composting facilities makes odour emissions worse due to more waste handling and exposure. Effective control of odours is essential for successful operations and community support. This document details the characteristics of mixed waste in India, identifies key odorous compounds, outlines Indian regulations for odour control, describes global odour control practices, explores odour control technologies, and highlights effective strategies.
Municipal solid waste in India consists of 60 to 70% organic material. This includes food waste, vegetable peels, garden trimmings, and other biodegradable items. The rest includes recyclables such as paper, plastic, glass, and metals, along with hazardous household waste like batteries, paints, and chemicals, as well as inert materials such as sand, grit, and construction debris. The waste has a high moisture content, often over 50%, due to wet organic waste like kitchen scraps. It also has a low calorific value of 800 to 1,000 kcal/kg, which makes composting a better option than thermal processing. The quick breakdown of the organic part, along with the high moisture and poor airflow, leads to anaerobic conditions. This creates unpleasant smells during decomposition, especially in large pits where waste is stored before processing.
The decomposition of organic matter in MSW composting generates various odourous compounds due to microbial activity under varying oxygen conditions. Key compounds include:
These compounds are released during waste handling, preprocessing (e.g., trommel screening, conveyor transport), and storage in reception pits, requiring targeted odour control measures.
The Ministry of Environment, Forest and Climate Change (MoEF&CC) notified the Solid Waste Management Rules, 2016, which regulate the management of MSW in India for urban agglomerations, census towns, notified industrial townships, and other such areas. Major provisions for odour control are:
The technical guidelines of the CPCB suggest aeration, control of moisture, and technologies such as biofilters to control odours. Inconsistent follow-up due to financial limitations, infrastructural constraints, and lack of awareness leads to ongoing odour issues, especially in centres with big reception pits. Nevertheless, it is practically difficult to control the odour with the change in process only.
Globally, MSW composting facilities use process optimization and advanced technologies to manage odours, especially in systems with mechanical equipment and reception pits:
Biological systems use microbial activity to break down odorous compounds. They provide cost-effective and sustainable solutions:
Non-biological systems are utilized for pungent smells or where biological systems are unavailable:
Combining odour control technologies enhances efficiency and addresses a broader range of compounds:
These blends are designed according to the character and volume of the odour of the plant, with air from trommels, reception pits, and conveyors blown to the main treatment unit (e.g., biofilter) and then to a secondary unit (e.g., activated carbon) for further removal.
At Elixir Enviro Systems, we specialize in designing and delivering comprehensive odour control solutions tailored for municipal solid waste (MSW) composting plants across India. With deep domain expertise in biological air treatment and solid waste handling, we offer:
Odour control in mixed waste composting plants is a serious concern in India because of high organic load, non-segregation, high moisture, and use of mechanical systems like trommels, conveyors, and large reception pits. Segregation, effective processing, and emission control are mandated under the Solid Waste Management Rules, 2016, but the gaps in implementation persist because of non-availability of resources. Significant odourous compounds like VOCs, ammonia, H2S, mercaptans, VFAs, and amines are released during handling of wastes, and specific interventions like enclosed preprocessing, aeration, and pit management are necessary. Internationally, technologies like in-vessel composting, biological systems (biofilters, biotrickling filters, bioscrubbers), and non-biological systems (chemical scrubbers, activated carbon filters, thermal oxidation, ozone treatment, plasma technology) are useful in odour control, and combination treatments enhance efficiency. For India, using low-cost biological technologies like biofilters, along with better segregation, pit aeration, and enclosing mechanical systems, may improve odour control and support sustainable composting operations.
Q1: Why does municipal solid waste composting produce strong odours?
Municipal solid waste composting involves the decomposition of high-moisture, organic-rich waste. Under anaerobic conditions—often caused by poor aeration or excess moisture—this generates volatile organic compounds (VOCs), ammonia, hydrogen sulfide (H₂S), volatile fatty acids (VFAs), and other malodorous gases.
Q2: What are the main sources of odour in Indian composting plants?
The key sources include large reception pits with poor ventilation, trommel screening equipment, and open conveyor systems. These areas facilitate anaerobic conditions and release odorous compounds during waste handling and storage.
Q3: What is the best odour control technology for MSW composting in India?
Biological systems like biofilters and biotrickling filters are the best in cost terms for Indian conditions. They provide high odour removal efficiency (85–98%) with relatively lower running cost, especially when combined with appropriate enclosures and pit aeration systems.
Q4: Are Indian composting plants required to control odour under law?
Yes. The Solid Waste Management Rules, 2016, control odour by proper segregation of waste, standards for processing, and measures for controlling emissions. A permission from the State Pollution Control Boards is required for plants with more than 5 metric tonnes per day with special provisions for odour control.
Q5: Can process adjustments alone eliminate odour emissions?
No. While process improvement like aeration and moisture control reduces odour formation, odour formation cannot be eliminated. Effective odour control relies on the application of a combination of biological or chemical treatment processes, equipment enclosures, and efficient management of sound reception pits.
Sewage Treatment Plants (STP), Fecal Sludge (Septage) Treatment Plants (FSTP), and Effluent Treatment Plants (ETP) are essential for managing wastewater generated from domestic, municipal, household, and industrial sources. However, these facilities are often associated with foul odour emissions, which pose a serious nuisance to the surrounding communities.
Odour generation depends on factors such as plant size, wastewater composition, retention time, aeration levels, and the design and maintenance of the treatment process. Unpleasant odours are not merely a comfort issue—they can lead to public complaints, regulatory scrutiny, and operational inefficiencies.
Elixir Enviro Systems Pvt Ltd (www.elixirenviro.in) the pioneer in odour control, Offers customised and integrated odour control solutions for STPs and ETPs across India. From proper ventilation design to advanced treatment technologies, Elixir provides systems to eliminate odour at the source, enhance air quality, and ensure regulatory compliance.
Odour formation in sewage, septage, and effluent treatment plants (STPs, FSTPs, and ETPs) is primarily due to the anaerobic decomposition of organic matter. Under low or no oxygen conditions, microorganisms break down waste and release gases with pungent, foul odours. Understanding the source of these odours is essential for devising effective control measures.
Odour control is not a universal solution. The technology you choose depends on the air volume that needs treatment, the level of pollutants, and the specific stages of the treatment process that produce odour. Here are the most common odour control systems used in sewage and effluent treatment plants:
What is a biofilter? A biofilter is a porous bed made of organic media, some are generic media and some are proprietary fomulations. Generic media includes substances such as compost, wood chips, or synthetic materials. The proprietary media include the media manufactured by Elixir enviro systems (www.elixirenviro.in) such as Cocofil® 25 & Cocofil® 25 etc, wherein the manufacturer guarantees the removal efficiencies. It supports a microbial population that biologically degrades odourous compounds such as hydrogen sulphide (H₂S), ammonia (NH₃), and volatile organic compounds (VOCs).
The odourous air is passed through the media bed, and the microorganisms convert the pollutants into harmless by-products like CO₂ and H₂O. Biofilters are highly effective and can remove up to 95% of odours when properly maintained. However, the performance is highly dependent on media moisture content and air distribution. Few versions of biofilters offered by Elixir Enviro Systems can be seen at: Click Here
Bio-trickling filters employ inert packing media over which water and nutrients continuously trickle, creating a moist environment conducive to microbial growth. As odour-laden air passes through the filter, aerobic bacteria break down the pollutants.
These well-aerated systems can treat both volatile organic and inorganic compounds. A primary benefit is their ability to efficiently handle high odour concentrations in a compact design. However, nutrient dosing and the risk of clogging due to biomass buildup must be carefully managed.
Also known as a bio-washer, the bio-scrubber operates in two stages. In the first stage, odourous air comes in contact with a liquid absorbent, typically water or a chemical solution, which absorbs the pollutants. In the second stage, the liquid goes into a separate tank for biological treatment. This is where microbes come in—they break down the compounds that were previously absorbed.
Bio-scrubbers are especially effective at treating highly soluble compounds such as H₂S. They are known for their high reliability and low chemical consumption, particularly when supported by proper nutrient management.
Chemical scrubbers remove odourous gases using acidic or alkaline solutions. The polluted air stream is brought into contact with a scrubbing liquid in a packed tower, where chemical reactions neutralise the odourous compounds.
The pH of the scrubber is maintained based on the nature of the pollutants (acidic for ammonia, alkaline for H₂S). Although chemical scrubbers are efficient and quick acting, they require chemical handling infrastructure and periodic monitoring. This is particularly suitable where the odour characterization is done and fine removal is not expected.
Elixir Enviro’s scrubber systems are custom-built to ensure precise dosing, optimal contact time, and minimal chemical waste.
A carbon filter is a highly effective solution frequently selected for its easy installation. It operates through adsorption, with activated carbon capturing and retaining odourous gases such as hydrogen sulfide (H₂S), ammonia (NH₃), and volatile organic compounds (VOCs) commonly released from wastewater treatment.
The activated carbon can come from bituminous coal or coconut shells and might be treated with chemicals to improve its ability to absorb specific pollutants. The carbon bed sits in a sealed container through which the foul air passes, letting the media absorb contaminants before clean air is released. A well-designed carbon filter system can remove up to 99% of odours. Maintenance includes regular inspections, monitoring pressure drops, and changing the carbon media every 12 to 24 months, depending on the gas load. Carbon filters are compact, quiet, and easy to fit into existing systems, but the ongoing cost, which is almost as high as the initial cost, can make them less appealing for larger units.
In many sewage and effluent treatment plants, using a mix of treatment techniques works better than sticking to just one method.
For instance, biofilters used with chemical scrubbers or bio-trickling filters followed by activated carbon polishing can offer multiple layers of odour removal. This helps meet strict air quality standards.
Elixir Enviro creates modular systems that fit into new or existing plants, allowing for easier adjustments as needs change.
Prevention is always better than cure. In addition to treatment technologies, smart plant design and operation significantly reduce odour emissions. Key approaches include:
Controlling odours from sewage and effluent treatment plants is important for multiple reasons.
At Elixir Enviro Systems, we specialize in designing and executing custom odour control solutions tailored to the unique needs of sewage and effluent treatment plants across municipal, industrial, and residential sectors. With decades of expertise and a strong focus on innovation, our solutions are engineered to deliver maximum odour reduction, regulatory compliance, and community satisfaction.
Odour control from sewage and effluent treatment plants is not a luxury—it is a necessity. It ensures cleaner air, healthier environments, and peaceful coexistence with surrounding communities.
Elixir Enviro Systems Pvt Ltd is a trusted partner in delivering customised, cost-effective, and high-performance odour control solutions for both municipal STPs and industrial ETPs across India. With a comprehensive range of technologies—from biofilters and scrubbers to modelling and monitoring tools—Elixir ensures that your facility stays compliant, efficient, and community-friendly.
Interested in Odour Control Solutions for Your Treatment Plant?
📞 Reach out to us at info@elixirenviro.in 🌐: www.elixirenviro.in
Odours in STPs and ETPs mainly come from the breakdown of organic matter in the absence of oxygen. This process releases gases such as hydrogen sulphide (H₂S), ammonia (NH₃), volatile organic compounds (VOCs), and mercaptans. These gases have strong, bad smells and can be harmful to health if not managed.
Yes, prolonged exposure to gases such as H₂S and ammonia can cause eye irritation, headaches, nausea, and respiratory problems. At high concentrations, these gases can be toxic, making affected people unconscious and sometimes causes death as well. There are several cases of people falling into the drains and lost lives, mainly due to the toxicity of gases like H2S. This can happen in STPs as well, especially when the source is in a confined zone. Effective odour control is important for the health and safety of plant workers and surrounding communities.
Key odour-generating zones include:
These areas should be prioritised for containment and odour control systems.
When properly maintained, biofilters can remove up to 95% of odourous compounds, especially hydrogen sulphide and VOCs. Their efficiency depends on type of media, moisture content of the media, air distribution, and microbial activity.
In the dairy industries maintaining a clean hygienic and Odour free environment is critical not only for regulatory compliance but also for employee health and brand image. From milk pasteurization to ghee carification, each stage in dairy processing can emit various smell that, if left unchecked can cause discomfort , environmental concerns and even neighbour complaints. This blog guides you to explore the cause of odour in dairy, milk and ghee processing plants and effective strategies to control and eliminate them.
Dairy processing involves the handling of large amounts of organic materials such as raw milk, cream, curd and butter, which are subjected to spoilage and fermentation. If not managed properly, the by-products of these processes can lead to the release of unpleasant smells. Here’s why odour control should be a top priority:
Understanding the sources of odour helps in deploying targeted solutions. Some of the most common odour sources in a dairy or ghee processing facility include:
Psychrophilic (bacteria with optimal growth rate below 15°C) and Mesophilic (bacteria with optimal growth rate between 20-40°C) bacterial growth can make the milk processing plant smell awful. This happens, If the milk is stored for extended periods at improper temperatures, it can ferment and can produce sour or putrid odours.
The heating of milk and cream releases volatile organic compounds (VOCs) that contribute to strong smells, especially during ghee production. Also improper processing like Overheating butter during clarification can cause burnt odours, while incomplete removal of milk solids can lead to spoilage-related smells.
Whey, a by-product of curd and cheese making, contains organic matter that decomposes quickly. Improper disposal leads to foul smells.
Milk spills or leftover residue on floors can rot and produce odour if not cleaned thoroughly.
Effluents containing milk solids, fats, and detergents from cleaning-in-place (CIP) systems can create anaerobic conditions, emitting hydrogen sulfide and other gases.
Managing odour in dairy processing plants requires a multi-pronged approach combining engineering, chemical, and biological controls. Here are some proven strategies:
Whenever possible, ensure that odour-generating processes like ghee clarification or cheese ripening are enclosed and equipped with fume extraction systems. Also its always better to use the enclosed crate washing units and so on to avoid the spillage milk speading all over and acting as a fugitive source of odour.
These eco-friendly systems use microbial activity to neutralize odours.
✅ Biofilters (Cocofil™ or Organic Media)
A mixture of coconut husk, compost, and soil traps and degrades VOCs biologically. These are perfect for continuous, low-concentration odour sources.
In this setup, odourous air is washed with water in a tower where bacteria are suspended. The scrubbing media absorbs odourous gas, and which is later transferred to an aeration-based treatment unit. At this aeration tank the microbes digest compounds like H₂S and ammonia and making it odourless compounds. This liquor is later circulated again in the absorption/scrubbing column to as a continuous system.
✅ Biotrickling Filter
In this setup, odourous air is passed through a column where the microbes are attached on a packing medium like in the trickling filter. Unlike trickling filter, which is used for wastewater treatment, here the case of biotrickling filter, air is being treated. Similar to that in the scrubber, the mass transfer of odourous2 compounds first happens from waste gas to the liquid that is being trickled over the media containing bacteria. Then the compounds gets taken up by the bacteria from the liquid and neutralize them.
All the above systems are low-maintenance, energy-efficient, and are highly effective for odour control.
Ideal for point-source odours with high gas concentrations. Here, odourous air is passed through a packed column or spray scrubbers where it reacts with acid/alkali solutions.
Used for ammonia control (uses acidic solution as scrubbing liquid)
Used for hydrogen sulfide and other acid gas control (alkaline solutions are used as scrubbing liquid).
Always include mist eliminators to prevent chemical carryover.
These are compact, plug-and-play systems that adsorb odourous gases using porous carbon media. Suitable for:
They offer high removal efficiency and minimal maintenance, making them a popular choice.
Instead of letting organic waste rot in open containers, convert it into compost or manage it through covered anaerobic digestion tanks.
Managing odour effectively starts with knowing when, where, and how it’s being released. One of the smartest ways to do this is by using real-time odour mapping and monitoring with advanced sensor technology.
By placing sensors and data loggers in key areas around the facility, plant operators can keep an eye on odour levels, spot unusual changes, and identify problem spots quickly. This steady flow of data helps teams take action early—before odour becomes a regulatory issue or leads to complaints from the community.
How Oizom Helps with Odour Monitoring
Oizom (www.oizom.com), a leader in environmental monitoring, provides innovative tools like Polludrone and Odosense to tackle odour challenges. These smart, IoT-enabled devices are designed to accurately detect a variety of odourous gases, including hydrogen sulfide (H₂S), ammonia (NH₃), methane (CH₄), and VOCs, giving operators the insights they need to stay ahead of potential problems.
In India and many other countries, dairy processing units—including those producing milk, curd, butter, and ghee—must adhere to stringent odour emission norms laid out by their respective Pollution Control Boards. The Central Pollution Control Board (CPCB) and State Pollution Control Boards (SPCBs) have specific environmental guidelines aimed at minimizing nuisance odours that can affect local communities. To stay on the right side of regulations, facilities need to run regular environmental audits, keep current records of their emissions and cleanup efforts, and work with certified experts in odour control. Why go through all that? Because staying compliant doesn’t just help avoid fines or legal trouble—it also builds public trust and shows that the company genuinely cares about the environment.
Elixir Enviro Systems is a leading name and pioneer in India in industrial odour control, providing end-to-end solutions that help dairy processing units stay compliant, efficient, and community-friendly. With extensive experience in managing odour emissions across diverse industries, Elixir offers specialized services tailored for dairies, milk processing units, and ghee manufacturing plants, where organic waste, fermentation processes, and effluent treatment systems often result in strong and persistent odours.
Our offerings include:
With over 1 million m³/hr of treated air capacity across India, Elixir Enviro Systems is the trusted partner for sustainable, scalable, and proven odour control in the dairy industry.
Odour control in dairy, milk, and ghee processing plants is not a luxury—it’s a necessity. Persistent odours don’t just affect your plant’s environment; they can compromise employee health, community relations, and compliance with environmental regulations. A proactive, well-engineered odour management strategy enhances operational efficiency, reduces legal risk, and strengthens your brand’s reputation.
Elixir Enviro Systems helps dairy processors take odour control from an afterthought to a core operational priority. With industry-specific expertise, cutting-edge technologies, and end-to-end support, we empower your facility to operate cleaner, safer, and more sustainably.
📞 Need help with odour control at your facility?
Partner with Elixir Enviro Systems to implement reliable, compliant, and sustainable odour control solutions tailored to your dairy operations.
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Foul odours can result from the fermentation of spoiled milk (raw material handling), heating of fats (processing), waste accumulation, whey disposal, and inefficient cleaning processes. Also, wastewater treatment plant collection tanks and headworks creates big odour nuisance issues. In many places, the emissions from the spray drying column also creates huge odour nuisance. In short, the odour from dairy can be the following places
Odour perception is subjective but measurable using sensory and instrumental techniques. Commonly detected smells in dairy operations include sour milk, rotten eggs (hydrogen sulphide), rancid butter, and ammonia-like scents. Odour monitoring includes both qualitative and quantitative approaches:
Several key compounds are responsible for malodour in dairy operations:
Operational changes can significantly reduce odour:
Use enclosed heating systems, make sure the area is well-ventilated, and use air scrubbers or odour-neutralizing products. Keeping the space clean and removing waste regularly also makes a big difference.
Yes, Biofilters, Biotrickling filters, Bioscrubbers and plasma ionization are sustainable, environmentally friendly options that effectively neutralize odours. Generally, the Biological systems such as Biofilter, Biotrickling filters and Bioscrubbers turns out to be the lowest lifetime cost system. Require low energy and offer high removal efficiency for H2S and VOCs
Key considerations:
Absolutely. Most environmental boards require odour management plans, and effective odour control helps meet these compliance standards
The fish and shrimp feed manufacturing industry plays a vital role in aquaculture, providing essential nutrition for farmed species. However, one of the major challenges faced by feed producers is odour emissions during processing. Strong, unpleasant odours can arise from raw materials like fishmeal, fish oil, and other protein-rich ingredients, leading to environmental concerns and potential regulatory issues.
Effective odour control is crucial not only for maintaining a healthy work environment but also for ensuring compliance with environmental regulations and fostering good community relations. In this blog, we will explore the sources of odour in fish and shrimp feed production and discuss practical strategies to mitigate them
Bacteria and fungi acting on proteins and fats in raw materials and waste streams produce odorous compounds such as:
Odour emissions from fish and shrimp feed manufacturing plants are a significant environmental concern affecting air quality and local communities. These odours, mainly caused by volatile organic compounds (VOCs) and nitrogenous compounds released during processing, contribute to air pollution and can lead to frequent community complaints. Persistent and strong odours from aquafeed production can also negatively impact local biodiversity by disturbing nearby ecosystems and sensitive wildlife.
Effective odour control in fish feed manufacturing not only reduces these environmental impacts but also helps improve relations with surrounding communities. By managing odour emissions proactively, feed manufacturers can prevent complaints, avoid costly fines, and reduce the risk of legal action. Strong odour management practices enhance a company’s reputation and demonstrate a commitment to sustainable and responsible aquaculture production.
The fish and shrimp feed manufacturing industry must comply with strict environmental regulations related to odour emissions and air pollution control. In India, agencies like the Central Pollution Control Board (CPCB) enforce standards for odour limits and air quality that feed producers must meet. Globally, regulations from bodies such as the United States Environmental Protection Agency (EPA) and the European Union (EU) provide guidelines for industrial odour control and emissions management in aquafeed production.
Compliance with these odour regulations is essential for legal operation and plays a vital role in corporate social responsibility (CSR) and sustainability reporting. Meeting regulatory requirements helps aquafeed manufacturers avoid penalties, ensures operational continuity, and supports environmental stewardship goals. Integrating advanced odour control technologies and following regulatory frameworks enable companies to reduce volatile organic compounds (VOCs) and improve air quality, fostering sustainable fish and shrimp feed production.
To address these challenges, manufacturers can adopt the following strategies:
A leading shrimp feed manufacturer with a production capacity of 400 tons per day was facing persistent and intense odour emissions at its facility. The primary raw materials—fishmeal, fish oil, soybean meal, vitamins, and minerals—generated strong, fishy odours, particularly during cooking, drying, and cooling phases. Additional odour sources included the grinder unit and material conveying systems.
The company approached Elixir Enviro Systems Pvt. Ltd. for an end-to-end odour control solution. After a detailed site audit and airflow assessment, Elixir designed and installed a high-performance odour abatement system consisting of:
The system was engineered to handle a process airflow of 75,000 CMH, blending hot air from the dryer and directing it efficiently into the biofilters. Performance testing revealed a remarkable odour removal efficiency with final odour concentration at the outlet measuring just 4 OU/m3 (Odour Units), when tested using field olfactometry—well below industry standards
This successful implementation not only eliminated odour-related complaints but also helped the client align with environmental norms, boosting their sustainability credentials.
If you’re seeking reliable odour control solutions for fish and shrimp feed manufacturing, Elixir Enviro Systems is your trusted partner. We specialize in industrial odour treatment, wastewater management, and biofiltration systems for factories and processing plants.
With years of experience, Elixir offers complete turnkey solutions—from design and installation to testing and long-term maintenance. Whether your facility requires wet scrubbers, biofilters, regenerative thermal oxidizers (RTOs), or real-time odour monitoring systems, Elixir has you covered.
Why Choose Elixir Enviro?
✅ Pioneer in Industrial Odour Control in India
✅ Largest player in India, treating about 1 Million cubic meters of air per hour
✅ Experts in aquafeed manufacturing odour control
✅ Custom solutions tailored to your industrial odour challenges
✅ In-house R&D and advanced simulation tools
✅ Onsite odour audits and pilot testing for optimized solutions
✅ Solutions designed to meet all local and global environmental regulations
Our expertise and innovative technology ensure your facility operates with minimal odour impact while maintaining productivity and compliance
As the aquafeed industry continues to grow, so does the responsibility to operate sustainably and sensitively—especially when it comes to odour emissions. Effective odour control in fish and shrimp feed manufacturing is not just about meeting regulations; it’s about protecting the health and well-being of plant workers, maintaining good relationships with surrounding communities, and upholding your company’s environmental integrity.
By implementing smart engineering controls, modern treatment technologies, and best operational practices, facilities can significantly reduce their odour footprint while improving overall efficiency and compliance.
At Elixir Enviro Systems, we specialise in designing and delivering tailored odour control solutions that work—from raw material intake to final air discharge. Whether you’re upgrading an existing system or planning a new facility, we’re here to help you create a cleaner, safer production environment.
📞 Ready to tackle odour challenges at your aquafeed plant?
💬 Contact Elixir Enviro Systems today for expert consultation, onsite assessment, or a custom solution that meets your regulatory and operational goals.
Q1: Why is odour control important in fish and shrimp feed manufacturing?
Odour control helps reduce environmental pollution, ensures compliance with regulations, protects worker health, and maintains good relations with nearby communities.
Q2: What are the main sources of odour in aquafeed production?
Odour mainly originates from raw materials like fishmeal and shrimp meal, processing stages (grinding, cooking, drying), storage of raw materials and waste, and microbial activity breaking down organic compounds.
Q3: Which technologies are effective for odour control in feed plants?
Common technologies include biofilters, wet scrubbers, thermal oxidizers, enclosed systems, and advanced ventilation combined with real-time odour monitoring.
Q4: How can wastewater treatment help with odour control?
Treating wastewater and organic solids promptly prevents decomposition that generates odours. Methods like anaerobic digestion reduce odours and produce useful biogas.
Q5: How often should odour control equipment be maintained?
Regular maintenance is essential and should be conducted based on manufacturer guidelines and site-specific needs to ensure continuous effective performance.