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DUCON® Biotrickling Filter (BTF)
DUCON® Biotrickling Filter is an advanced biological air treatment technology that combines the advantages of a biofilter and a chemical scrubber for the abatement of volatile organic compounds (VOCs) and odor-causing gases in industrial emissions. The system harnesses the metabolic capabilities of specialized microorganisms to biologically degrade organic pollutants. It features a packed bed/column filled with inert plastic media that supports robust biofilm growth. The casing and internals can be fabricated from 304/316 stainless steel (SS), PP, HDPE, or FRP depending on process requirements.
How It Works
Gas Contact
Contaminated exhaust gas is passed through the packed bed where microorganisms are immobilized. These microbes utilize selected VOCs as sources of carbon and energy.
Mass Transfer
Pollutants transfer into the biofilm and into a counter-currently recirculated wash (nutrient) solution. This liquid nourishes the microorganisms and accelerates transfer from the gas phase into the biofilm.
Biodegradation & Regeneration
Within the bio‑reactive environment, microorganisms oxidize pollutants into harmless intermediate/final products. The system is routinely controlled to keep pH, nutrients, and salt balance within optimum ranges.
Blowdown & Biomass Control
Accumulated salts and excess biomass are removed via controlled blowdown; fresh water and nutrients are added to maintain equilibrium.
Mist Eliminator
The cleaned gas passes through a mist eliminator to remove residual droplets before discharge to atmosphere.
What Problem Does It Solve?
Biotrickling filters deliver high removal efficiencies particularly for water‑soluble VOCs and odorants (e.g., H₂S, NH₃, mercaptans, selected aldehydes/ketones/alcohols). Because they use naturally occurring microorganisms, they are an environmentally sustainable solution that helps protect air quality, achieve regulatory compliance, and improve workplace conditions.
