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AmerAir Bio-Trickling Filter Odour Control System in India 

AmerAir Bio Trickling Technology is an advanced biological odour control system that removes hydrogen sulphide (H₂S), mercaptans, VOCs, and other odour-causing compounds from industrial and municipal air streams. Using specialised packing media and naturally occurring microorganisms, it delivers efficient odour removal with low operating costs and sustainable performance.

What is a Bio-Trickling Filter System?

Bio-Trickling Filter (BTF) is an advanced biological odour control system that removes unpleasant and harmful gases from industrial air streams. It uses specialised microorganisms that grow on specially designed packing media to break down odour-causing compounds such as hydrogen sulphide (H₂S), mercaptans and VOCs. Instead of using harsh chemicals, the system biologically converts these pollutants into harmless by-products, providing effective, sustainable and environmentally friendly odour control.

[Contaminated Exhaust Air] > [Fan Extraction] > [Counter-Current Tower Bed] > [Microbial Oxidation] > [Clean Air Stack Discharge]

How Does the AmerAir Bio-Trickling Filter System Work?

The AmerAir® system utilises an engineered counter-current process to maximise gas-liquid mass transfer and support efficient biological degradation.

1. Extraction

A heavy-duty fan extracts foul air from source areas such as sewage wet wells, screen channels, sludge holding tanks and ETP units, and directs it into the bottom of the filter tower.

2. Ascent & Dissolution

The gas stream travels upward through the specialised packing bed, while fresh water or utility water flows downward through automated spray nozzles. During this process, the odorous compounds dissolve into the liquid phase.

3. Biological Oxidation

Specialised microorganisms attached to the packing media consume the dissolved gases as a food source. Through biological oxidation, the pollutants are converted into harmless, odour-free by-products.

4. Clean Discharge

The treated air is released safely through the top of the tower, significantly reducing odours and improving air quality.

Key Advantages of AmerAir Bio-Trickling Filter 

  • High Odour Removal Efficiency: Up to 99.5% H₂S removal and up to 85% removal of other odour-causing compounds.

  • Low Operating Costs: Reduced chemical usage, maintenance requirements and energy consumption.

  • Sustainable Technology: Environmentally friendly biological oxidation process with minimal secondary pollution.

  • Automated Operation: Automated water management and monitoring for reliable performance.

Target Industrial Applications in India

This technology is perfectly optimized to meet Indian climatic conditions and industrial requirements, serving:
 

  • Municipal Sewage Infrastructure: Sewage Treatment Plants (STPs), pumping stations, wet wells, and screen areas.

  • Effluent Treatment Plants (ETPs): Industrial wastewater treatment units in Chemical, Pharma, Textile, and Dairy industries.

  • Solid Waste Management: Composting facilities and organic waste processing plants.

  • Manufacturing Plants: Pulp & Paper, Tanneries, and Petrochemical processing plants facing severe sulfide odours.

Proprietary Technology: AmerAir OpeNet™ Packing Media

The core efficiency of any biological filter lies in its packing material. AmerAir® systems feature the proprietary OpeNet™ Media, designed to maximise biological performance and ensure long-term reliability.

High Biomass Density

A multilayered, structured woven synthetic material rolled into compact bundles to fit perfectly within the filter housing. This design provides a large surface area for microbial growth and activity.

Zero Channelling

Its structured configuration prevents air or water channelling, ensuring maximum gas-to-biomass contact time and consistent treatment performance throughout the media bed.

Ultra-Low Pressure Drop

The media is designed to minimise resistance to airflow, reducing the electrical load on extraction fans and significantly lowering ongoing energy costs.

Exceptional Durability

Fully resistant to corrosive by-products, including sulphuric acid, the media is backed by a 10-year warranty and offers an expected service life of up to 20 years.

Smart Automation: Water Control Cabinet

To maintain optimum biological activity, the system is equipped with an integrated water control cabinet designed for automated operation and precise process control.

Automated Irrigation

A motorised valve automatically regulates the addition of water across the media bed, ensuring the ideal moisture conditions for microbial activity.

PLC Monitoring

To maintain optimum biological activity, the system is equipped with an integrated water control cabinet designed for automated operation and precise process control.

The Science Behind the Dual-Zone Design

Unlike conventional biological systems, AmerAir® utilises a once-through water irrigation architecture that creates a distinct vertical pH profile within a single tower. This unique design establishes ideal conditions for two different types of specialised microorganisms to thrive simultaneously, enhancing overall treatment efficiency and odour removal performance.

  • Bottom Section (Acidic Conditions): Autotrophic bacteria thrive here, effectively removing Hydrogen Sulfide (H₂S).

  • Top Section (Neutral Conditions): Heterotrophic bacteria flourish, effectively removing Mercaptans and VOC compounds.
     

Chemical Reactions:

  • H₂S Oxidation (Autotrophic Bacteria): H₂S + 2O₂ → H₂SO₄

  • Mercaptan Oxidation (Heterotrophic Bacteria): 2CH₃SH + 7O₂ → 2CO₂ + 2H₂SO₄ + 2H₂O

Why Choose Amalgam Biotech as Your AmerAir Partner?

Authorised AmerAir Partner in India

Gain access to proven AmerAir Bio-Trickling Systems backed by global expertise and local technical support for industrial and municipal applications.

Application Assessment & Technology Selection

Our team evaluates odour sources, airflow requirements, contaminant characteristics, and operational objectives to recommend the most suitable Bio Trickling Filter, Carbon Adsorption System, or Chemical Scrubber for your facility.

Engineering, Installation & Commissioning Support

From system sizing and process integration to installation guidance and start-up assistance, we work closely with your team to support successful project implementation.

After-Sales Technical Support

We provide ongoing operational guidance, troubleshooting assistance, and performance optimisation support to help maintain reliable long-term system performance.

Complete Odour Management Solutions

In addition to AmerAir technologies, we offer OdoServe Odour Control Solutions, BactaServe Biocultures, and Turnkey Odour Control Services to help facilities address odour challenges at both the source and treatment stages.

Supplying AmerAir Bio-Trickling Filter Systems Across India

We provide technical consultation, application support, and odour control solutions for industrial and municipal facilities across major regions of India.
 

  • West & North India: Mumbai, Pune, Ahmedabad, Surat, Vadodara, Nashik, Nagpur, Indore, Jaipur, Chandigarh, and Delhi NCR.

  • South & East India: Hyderabad, Chennai, Bengaluru, Coimbatore, Kochi, Visakhapatnam, Bhubaneswar, Kolkata, and surrounding industrial regions.

Looking to Implement AmerAir Bio Trickling Technology in India? 

Control H₂S, mercaptans, VOCs, and wastewater odours with a proven biological odour control solution. Whether you are upgrading an existing facility or planning a new STP, ETP, pumping station, or industrial plant, our team can help you select and implement the right AmerAir Bio Trickling System.

Frequently Asked Questions

Q1: How does an AmerAir Bio Trickling Filter remove hydrogen sulfide (H₂S) and organic odours?

AmerAir Bio Trickling Filters pass foul air upwards through structured synthetic media that is continuously irrigated with a nutrient solution. Naturally occurring, non-pathogenic microorganisms growing on the media absorb and biologically oxidise pollutants such as H₂S, methyl mercaptan, and DMS into harmless by-products, including water, CO₂, and sulphates.

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  • The Science: Autotrophic bacteria grow on the synthetic media and convert corrosive H₂S gas into acidic liquid runoff. This biological process delivers long-term removal efficiencies of more than 99.5% without the need for hazardous chemical additives.

Q2: Why does structured synthetic media perform better than traditional organic media in biofilters?

AmerAir uniform synthetic media resists compaction, clogging, and acid degradation, maintaining a consistently low pressure drop even at high airflows. Unlike organic woodchip or compost media, which rots, settles, and needs replacing every 2 to 3 years, synthetic media provides long-term operational stability.
 

  • Operational Impact: Prevents media channelling, reduces fan power consumption, and lowers the total cost of ownership by removing the need for frequent media replacement.

Q3: How do AmerAir Bio Trickling Filters achieve up to 70% lower operating costs than Chemical Scrubbers?

AmerAir Bio Trickling Filters can reduce operating costs by up to 70% by using biological digestion instead of continuous chemical reagents. Operating costs are mainly limited to low-power recirculation pumps, blowers, and occasional water top-ups, removing the need for costly chemical purchases such as sodium hydroxide or hypochlorite.
 

  • OPEX Breakdown:

    • Bio-trickling Filter: Power consumption with minimal water and nutrient dosing. No hazardous chemical inventory required.

    • Chemical Scrubber: Requires continuous chemical dosing, hazardous chemical storage, and additional safety compliance costs.

Q4: What materials of construction are used to protect AmerAir Bio Trickling Filters from acidic corrosion?

AmerAir Bio Trickling Filter vessels are manufactured from high-grade Fibreglass Reinforced Plastic (FRP) or Polypropylene (PP). These non-corrosive materials are specially designed to withstand highly acidic internal conditions, with pH levels dropping as low as 1.0 during H₂S biological oxidation.

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  • Structural Integrity: Provides a vessel design life of more than 20 years in demanding industrial environments such as STP headworks, wet wells, and sludge processing facilities.

Q5: What key applications and industries benefit most from AmerAir Bio Trickling Filters?

AmerAir Bio Trickling Filters are ideal for continuous, high-volume applications with heavy H₂S and organic sulfide loading. They are widely used in Municipal Sewage Treatment Plants (STPs), Wastewater Treatment Plants (WWTPs), pumping stations, food processing facilities, rendering plants, and composting operations.

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  • Ideal Operating Conditions: Designed for continuous 24/7 process air streams where biological cultures remain active and hydrated through automated trickle irrigation.

Q6: Can an AmerAir Bio Trickling Filter handle fluctuating gas loads and cold temperatures?

Yes, AmerAir BTFs are designed with resilient microbial biofilms that can handle temporary increases in inlet gas concentrations and flow fluctuations. Integrated automated water recirculation panels control irrigation, nutrient dosing, and pH to maintain consistent biological digestion under changing operating conditions.

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  • Process Control: For extreme load fluctuations or strict zero-odour discharge requirements, Amalgam Biotech often installs a downstream AmerAir Carbon Adsorber as a final polishing stage.

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