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Anaerobic Digester Biogas & Methane Calculator environmental
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Anaerobic Digester Biogas & Methane Calculator

Determine daily biogas production (SCFD), pure methane energy yield, volatile solids destruction (VSD), and CHP cogenerated electric power in kW.

Sludge Feed & Solids Loading

EPA 503 requires ≥ 38% for VAR

Biogas Composition & Energy

Biogas & Renewable Energy Yield

Daily Biogas Production
-- SCFD
-- Nm³/day
CHP Electric Power
-- kW
-- kWh / day
Pure Methane (CH4)
-- SCFD
-- MMBTU/day
Volatile Solids Destroyed: -- lbs VS/day
EPA Part 503 VAR Compliance: --
Estimated Annual Power Value: $ -- / yr (@ $0.12/kWh)
Volatile solids destruction (VSD) exceeding 38% complies with EPA 503 Vector Attraction Reduction (VAR) for beneficial biosolids land application.

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Frequently Asked Questions

How is biogas production calculated from volatile solids destruction (VSD)?

Anaerobic bacteria convert biodegradable organic matter (volatile solids) into methane and carbon dioxide. Well-operated municipal anaerobic digesters reliably produce 14 to 18 cubic feet of biogas for every pound of volatile solids destroyed: Biogas (SCFD) = Volatile Solids Fed (lbs/day) × VSD% × 15.0 cu ft/lb.

What is EPA Part 503 Vector Attraction Reduction (VAR)?

EPA Part 503 regulations governing sewage sludge land application mandate that biosolids must achieve at least 38% Volatile Solids Destruction (VSD) during anaerobic digestion. This reduces odors and eliminates the organic food source that attracts disease vectors such as flies, mosquitoes, and rodents.

What is the heating value of anaerobic digester biogas?

Pure methane (CH4) has a higher heating value of 1,012 BTU per standard cubic foot (SCF). Typical raw digester biogas containing 60% to 65% methane and 35% carbon dioxide has a net heating value of approximately 600 to 650 BTU per standard cubic foot.