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WWTP data

Sewage Sludge Production Values

⁄ Wastewater, on average, contains 200 mg/L of bio-degradable solids

⁄ Water chemistry, including pH, salinity, metal content,
etc. will effect sewage sludge quality and impact the production
of Hydrogen Sulfides (H S) and Silioxanes
2
⁄ Sewage Sludge, properly digested, can generated enough methane
rich biogas to have a lower heating value (LHV)

between 5.5 to 6.5 KWh/m (550 to 650 btu/scft) (50–70% CH )
3
4
Biogas Production from Sewage Sludge

⁄ 80–150 m of Biogas/ton of sewage sludge
3
⁄ 1.2–2.4 scft of Biogas/lbs of sewage sludge

Rules of Thumb

⁄ 378 liters of wastewater per day per day = 20 liters of biogas per day*

⁄ 100 gallons of wastewater per person per day = 1 scft of biogas per day*
* = Source: “Wastewater Engineering: Treatment
th
and Reuse, 4 Edition “ Metcalf & Eddy, 2003

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