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Author:
Michael Klepik, Chief Executive Officer
Michael Klepik, Chief Executive Officer
A broiler or layer complex puts out several hundred thousand cfm carrying compounds at parts per billion, moved by fans with no pressure reserve. Chemistry is the easier half of poultry farm odor control; airflow and static pressure decide what gets built.
What the Exhaust Stream Actually Carries
Ammonia carries most of the gas load. Birds excrete nitrogen chiefly as uric acid, which microbes convert through several intermediates to urea and then, by urease, to ammonia; release accelerates once litter moisture passes roughly 30% and pH rises above 7. ACGIH sets an 8-hour TLV of 25 ppm for NH3 with a 35 ppm short-term limit — worker exposure figures, not emission limits, and separate from flock welfare targets.
Reduced sulfur compounds matter for another reason: hydrogen sulfide, mercaptans and dimethyl sulfide register at low parts per billion, so exhaust clearing every gas limit still draws complaints at the fence line.
Reduced sulfur compounds matter for another reason: hydrogen sulfide, mercaptans and dimethyl sulfide register at low parts per billion, so exhaust clearing every gas limit still draws complaints at the fence line.
Poultry Farm
Particulate earns its own line. Feather barbules, bedding fines and feed particles carry adsorbed odorants out of the building; field biofilters on animal housing removed 90% or more of PM10 while stripping much less of the gas phase. Three scales apply and none converts to another: OSHA's 15 mg/m3 breathing-zone limit for particulates not otherwise regulated, PM10 and PM2.5 as gravimetric size fractions, and nuisance as a dilution-to-threshold ratio per ASTM E679. Fix which one the job is judged on before sizing.
Animal Feed Dust | Characteristics, Hazards, and Suitable Dust Collection Systems
Airflow and Static Pressure Set the Size
A tunnel-ventilated house 40 ft wide with an 8 ft mean cross-section needs 500 to 600 ft/min in hot weather, putting summer exhaust near 160,000 to 190,000 cfm. Winter minimum ventilation runs at a tenth of that or less, so any train faces a 10:1 turndown or takes a slice of the flow.
Pressure is the harder constraint. Direct-drive axial house fans are rated at 0.05 and 0.10 in. w.g., and delivery falls away sharply as resistance climbs. A packed bed adds 2 to 3 in. w.g. once packing, spray section and mist eliminator are counted, so bolting one onto an existing fan strips out the ventilation the flock needs. The treated stream needs its own booster. Narrowing scope to the minimum-ventilation fans shrinks the equipment and the power bill, but the same packing depth imposes the same resistance.
Cross-section follows from superficial velocity, A = Q / v. At 400 ft/min a 20,000 cfm side stream needs 50 ft2 of bed area, close to an 8 ft diameter column. Empty bed residence time is packing depth over that velocity, so 3 ft of random packing gives an EBRT of 0.45 s — true contact time is shorter, since packing and liquid hold-up take part of the volume. Full-scale monitoring of animal-house scrubbers in the Netherlands logged minimum EBRT of 0.4 to 1.1 s at average NH3 removal of 96% for acid-dosed units, 70% for biotrickling filters.
Pressure is the harder constraint. Direct-drive axial house fans are rated at 0.05 and 0.10 in. w.g., and delivery falls away sharply as resistance climbs. A packed bed adds 2 to 3 in. w.g. once packing, spray section and mist eliminator are counted, so bolting one onto an existing fan strips out the ventilation the flock needs. The treated stream needs its own booster. Narrowing scope to the minimum-ventilation fans shrinks the equipment and the power bill, but the same packing depth imposes the same resistance.
Cross-section follows from superficial velocity, A = Q / v. At 400 ft/min a 20,000 cfm side stream needs 50 ft2 of bed area, close to an 8 ft diameter column. Empty bed residence time is packing depth over that velocity, so 3 ft of random packing gives an EBRT of 0.45 s — true contact time is shorter, since packing and liquid hold-up take part of the volume. Full-scale monitoring of animal-house scrubbers in the Netherlands logged minimum EBRT of 0.4 to 1.1 s at average NH3 removal of 96% for acid-dosed units, 70% for biotrickling filters.
Flow animation in a scrubber with random packing
Those figures cover one wet stage. Losses add across a train: the three-stage arrangement below runs 6 to 11 in. w.g. before ductwork, or 29 to 53 bhp at 20,000 cfm.
Expert insights from Michael Klepik on ammonia scrubbers
Equipment Types and the Media Inside Them
A packed column dosed with sulfuric acid holds liquor at pH 3 to 4, converting ammonia into ammonium sulfate that leaves with the blowdown. Our wet scrubbers cover this duty: TORNADO RP vertical units with random packing run 600 to 24,000 cfm, and the fluidized-bed TORNADO FB reaches 175,000 cfm. Feather fiber and bedding fines favour the fluidized version, whose moving packing resists the bridging fixed beds suffer on dusty air.
Activated and impregnated carbon brings H2S, mercaptans and residual organics to trace levels, and our adsorbers and dry scrubbers are built for that duty. Water handling decides whether the bed works. A mist eliminator strips droplets but not vapour, and air leaving a wet stage sits near saturation, so reheat or drying belongs ahead of the carbon. Sensitivity differs by media: humidity competes for pore volume on virgin carbon, while alkali-impregnated grades need a surface water film to convert H2S.
Activated and impregnated carbon brings H2S, mercaptans and residual organics to trace levels, and our adsorbers and dry scrubbers are built for that duty. Water handling decides whether the bed works. A mist eliminator strips droplets but not vapour, and air leaving a wet stage sits near saturation, so reheat or drying belongs ahead of the carbon. Sensitivity differs by media: humidity competes for pore volume on virgin carbon, while alkali-impregnated grades need a surface water film to convert H2S.
Biofilter manufactured by Torch-Air
An open bed of wood chip and compost suits sites with land to spare. Monitored biobeds on animal housing, one on a laying-hen manure dryer at 75,000 m3/h, ran 1.4 to 3.3 s EBRT at 22 to 287 Pa for 38 to 74% NH3 and 43 to 62% odour reduction, breakthrough below 60% media moisture.
Feed silos, litter conveyors and manure dryers are concentrated point sources, far easier to enclose and duct than a barn. Our baghouse and cartridge collectors run 3 to 20 ft/min filtration velocity, and silo filters handle displacement air during feed delivery. Dry collection here is cheap and effective on particulate, though what it contributes to bird odor control site-wide is a measurement question, and it leaves house exhaust gases untouched.
Feed silos, litter conveyors and manure dryers are concentrated point sources, far easier to enclose and duct than a barn. Our baghouse and cartridge collectors run 3 to 20 ft/min filtration velocity, and silo filters handle displacement air during feed delivery. Dry collection here is cheap and effective on particulate, though what it contributes to bird odor control site-wide is a measurement question, and it leaves house exhaust gases untouched.
Installation of the TORNADO-RP Vertical Scrubber With Random Packing at a Meat Processing Plant
Choosing a Configuration and Specifying It
Distance to the nearest receptor, the regulatory driver and the hours that actually produce complaints matter more than removal percentages. A permit condition with a numeric limit forces continuous treatment of a defined stack. A complaint history asks for different work: pull the dates and hours, read them against wind and stability, size for the flow running then. Where that turns out to be minimum ventilation, a poultry odor control budget drops to a fraction of peak summer cost, provided the untreated share is accounted for.
Single-stage trains rarely hold up: a dry pre-filter, an acid-dosed wet stage and a carbon polisher in series each take what the previous one leaves.
Before quoting, a supplier needs design flow and temperature, inlet and target outlet NH3 and H2S, dust loading in gr/ft3, available static pressure at the fan, water hardness, and the lowest winter ambient the liquid loop must survive. Our engineers size from a questionnaire in one to two days.
Single-stage trains rarely hold up: a dry pre-filter, an acid-dosed wet stage and a carbon polisher in series each take what the previous one leaves.
Before quoting, a supplier needs design flow and temperature, inlet and target outlet NH3 and H2S, dust loading in gr/ft3, available static pressure at the fan, water hardness, and the lowest winter ambient the liquid loop must survive. Our engineers size from a questionnaire in one to two days.
Keeping Performance From Drifting
Liquor chemistry moves first. pH climbs as ammonia loads the solution, so acid dosing and blowdown follow continuous pH and conductivity readings, not a calendar. Nozzles plug with feather fiber and bedding fines, and a fouled spray pattern shows as falling removal long before it shows as pressure change.
On one animal by-product project we supplied, plain water in the scrubber tank grew a bacterial population that produced a smell of its own, fixed only by periodic washing with a cleaning reagent.
Carbon beds fail quietly, so change-out follows outlet sampling rather than elapsed hours. Biofilter beds fail comparably: channeling drops resistance and removal together, so a falling differential is a warning, not good news. Freeze protection belongs in the base scope for odor control in poultry houses across the northern states.
On one animal by-product project we supplied, plain water in the scrubber tank grew a bacterial population that produced a smell of its own, fixed only by periodic washing with a cleaning reagent.
Carbon beds fail quietly, so change-out follows outlet sampling rather than elapsed hours. Biofilter beds fail comparably: channeling drops resistance and removal together, so a falling differential is a warning, not good news. Freeze protection belongs in the base scope for odor control in poultry houses across the northern states.
Odor Wet Scrubbers Design, Applications, and Advantages
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We always perform precise calculations and offer expert assistance in selecting the optimal dust collection or gas cleaning systems, typically completing this process within 1 to 2 days
Head of Engineering,
Vladimir Nikulin
Vladimir Nikulin
CALCULATION AND SELECTION
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