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Tom Ferrero
Elkhart Environmental Processing Corp
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• Overview o Why Odor Control?o Available Techniqueso Biofilter Construction
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• Safety o Corrosion• HydrogenSulfideo Explosion• Methaneo Health• Airbornedisease
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• OdorControlStrategy o Iden?fySourcesofOdors
• SeptageReceivingArea• ScreeningandGritRemoval• Equaliza?onTanks• Processing–Dewatering• Filtrate
o Es?mateDegreeofControlRequiredbasedonproximityofdownwindreceptors
o EvaluateOp?onso SelectAppropriateStrategyo DesignandConstruct
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• OdorControlStrategy o BestManagementPrac?ces• Usequick-disconnectfiOngs• Avoid“FreeFall”ofseptage• Providewashdownfacili?es
forspills• Ven?latetankstoodorcontrol
system• Everythinginside!
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• OdorControlStrategy o BestManagementPrac?ces
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• OdorControlStrategy o BestManagementPrac?ces
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• OdorControlStrategy o BestManagementPrac?ces
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• OdorControlStrategy o BestManagementPrac?ces
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• OdorControlStrategy o BestManagementPrac?ces
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• Available Techniques o RemoteSiteo Odorcounteractants(Mis?ng)o WetScrubbero Ac?vatedCarbono Biofilter
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• Available Techniques o RemoteSite
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• Available Techniqueso Mis?ng(odorcounteractants)
• Sprayedintotheatmosphere• Reactwithodorouscompounds• Encapsulateodorouscompounds• Substan?alcostofchemicals• 30to40%reduc?onofodors
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• Available Techniques o OdorCounteractants
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• Available Techniques o WetScrubber
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• Available Techniques o Ac?vatedCarbonAbsorber
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• Available Techniques o Ac?vatedCarbonAbsorber
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• Available Techniques o Biofilters
- Passing odorous air through a media containing microbial populations
- Microbes use the odorous compounds as a food source
- Media must be kept moist and air must have good paths through media
- Requires long contact times and low velocities
- Systems come in a variety of designs and media configurations
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• Available Techniques o Biofilters
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Technique Cost Factors Advantages Disadvantages
Wet Scrubber Moderate Capital and operating costs
Effective and Reliable
High Chemical Use, and spent chemical to dispose
Activated Carbon Absorber
Cost depends on frequency of carbon use
Simple, few moving parts, effective
Only applicable for dilute streams
Biofilters Low capital and O&M costs
Simple, minimum O&M
Design criteria not well established, large land area
Odor Counteractants
Cost dependent upon chemical usage
Low Capital cost
Limited odor removal efficiency
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• Biofilter Construction
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• Biofilter Construction
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• Biofilter Construction
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Typical Design Criteria for Biofilters
Parameter Value
Hydraulic Loading 2-10 cfm/sq ft
Detention Time 20-60 seconds
Media Depth 3-5 ft
Media pH 6-8
Pore Volume 40-50%
Moisture Content 50-60%
Media Constitutents Bark Mulch, hardwood chips, biosolids or leaf compost
Humidity of inlet air 80-100%
Recommend air changes 6 volume changes/hour
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Typical Design Criteria for Biofilters
Parameter Value
Hydraulic Loading 2-10 cfm/sq ft
Detention Time 20-60 seconds
Media Depth 3-5 ft
Media pH 6-8
Pore Volume 40-50%
Moisture Content 50-60%
Media Constitutents Bark Mulch, hardwood chips, biosolids or leaf compost
Humidity of inlet air 80-100%
Recommend air changes 6 volume changes/hour
15000 cfm / 2500 sf
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Typical Design Criteria for Biofilters
Parameter Value
Hydraulic Loading 2-10 cfm/sq ft
Detention Time 20-60 seconds
Media Depth 3-5 ft
Media pH 6-8
Pore Volume 40-50%
Moisture Content 50-60%
Media Constitutents Bark Mulch, hardwood chips, biosolids or leaf compost
Humidity of inlet air 80-100%
Recommend air changes 6 volume changes/hour
6 cfm / sq ft
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Typical Design Criteria for Biofilters
Parameter Value
Hydraulic Loading 2-10 cfm/sq ft
Detention Time 20-60 seconds
Media Depth 3-5 ft
Media pH 6-8
Pore Volume 40-50%
Moisture Content 50-60%
Media Constitutents Bark Mulch, hardwood chips, biosolids or leaf compost
Humidity of inlet air 80-100%
Recommend air changes 6 volume changes/hour
6 cfm / sq ft
4 ft
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Typical Design Criteria for Biofilters
Parameter Value
Hydraulic Loading 2-10 cfm/sq ft
Detention Time 20-60 seconds
Media Depth 3-5 ft
Media pH 6-8
Pore Volume 40-50%
Moisture Content 50-60%
Media Constitutents Bark Mulch, hardwood chips, biosolids or leaf compost
Humidity of inlet air 80-100%
Recommend air changes 6 volume changes/hour
6 cfm / sq ft
4 ft
40 seconds