The bio-filter is installed to reduce the smell from rest gas and air from protein processing plants like rendering (meat and bone) and fishmeal plants.
The design is normally a large (typically 10 x 20 x 2 meters or much larger) basin like a “swimming pool” where the smelly rest gas is slowly filtered from the bottom through a layer of moist “bio media” like coconut husks, tree (pine) bark, rice husk or similar bio materials after having been cooled down and condensed to less than 40 deg C.
Simple bio filters may be a heap of media on the ground with a pipe going to the center of the heap to release the smelly rest gas and air.
The naturally occurring bacteria in the filter will “eat” the remaining smell molecules. This sounds strange but it works.
The rest gas comes from condensers of vapor from cookers and dryers, point suction of air/vapor from machines and bins and free air from inside the building.
If the temperature is higher than 40 deg C the bacteria will die and there will be no deodorizing effect.
The media must be moist to function and there is installed a garden type sprinkler system all over the media that is turned on and off by a timer.
The size of the bio filter is calculated by retention time, this at the time the rest gas is in contact with media, typically 30 to 60 seconds. Sometimes there is installed a cross-flow water scrubber just before the bio filter to remove dust and moisten the rest gas.
ASTW can supply drawings for the filter basin and supply all mechanical components, blower, scrubber and ducting.
The bio filter is typically 2 meters deep where 0.5 meter is free space for the rest gas to distribute and 1.5 meter is filled with the media.
After some time, the filter material or bio media will turn into fertile earth mold and will have to be replaced, for bark this may take 4-5 years.
To study in detail read website: BIO FILTER, M887_Final Report ,– from Australian Rendering Industry
Proven success across 300+ installations worldwide. Discover how ASTW’s turnkey fishmeal and rendering solutions have helped global clients achieve superior efficiency, reduce operational costs, and exceed environmental compliance standards.
ASTW delivered a turnkey fishmeal plant in eastern Thailand, designed for lean fish and marine by-products. The project included full installation, energy-saving systems, and odor control to comply with local environmental regulations. Key Equipment 3-Phase Decanter LTR Disc Dryer Preheater Twin Screw Press WHE
Proven success across 300+ installations worldwide. Discover how ASTW’s turnkey fishmeal and rendering solutions have helped global clients achieve superior efficiency, reduce operational costs, and exceed environmental compliance standards.
Our fishmeal and rendering plants process various raw materials including fish waste and by-products, poultry offal and feathers, beef and pork by-products, mixed animal waste, and seafood processing waste. Each plant is customized for specific material types to ensure optimal processing efficiency and product quality.
Yes, ASTW delivers complete turnkey solutions including engineering design, equipment manufacturing, worldwide shipping, on-site installation, system commissioning, operator training, and ongoing technical support. Our 40+ certified technicians handle projects from concept to full operation across 36+ countries.
We provide comprehensive 24-month equipment warranty, 5-year major component guarantee, lifetime technical support, global spare parts availability, preventive maintenance programs, and 24/7 emergency service. Our service network ensures minimal downtime and maximum plant performance.
Absolutely. Our plants include advanced odor control systems (biofilters, scrubbers, thermal oxidizers), environmental monitoring equipment, waste heat recovery systems, and compliance with international environmental standards including EU, EPA, and local regulations worldwide.
Emergency spare parts are available within 24-48 hours for critical components through our global distribution network. Standard parts ship within 5-7 business days. We maintain strategic inventory locations in Asia, Europe, and Americas to ensure rapid delivery worldwide.
Our plants range from 50 tons/day for smaller operations to 600+ tons/day for large-scale industrial facilities. We design custom solutions based on your raw material volume, product requirements, site conditions, and future expansion plans.
