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AppendixB: AnaerobicDigesterDesignCriteriaUsedforTechnicalPotentialAnalysis The following anaerobic digester design criteria were used to estimate the total wastewater influent flow rate that a typically sized digester can treat, as well as the biogas generation rate and the heat load of a typically sized digester. All criteria are based on a typically sized mesophilic digester. System Design Parameter Value Reactor Type1 Reactor Shape1 Organic Load2 (lbs/day VS) Percent Solids in Flow2 (% w/w) Sludge Density2 (lbs/gal) Flow to Reactor (lbs/day) Flow to Reactor (gal/day) Flow to Reactor (ft3/day) Reactor Depth3 (ft) Design Load1 (lbs VS/ft3/day) Total Reactor Volume (ft3) Reactor Area (ft) Reactor Diameter1 (ft) Retention Time (days) Influent Temp – Winter (°F) Air Temp – Winter (°F) Earth Around Wall Temp – Winter (°F) Earth Below Floor Temp – Winter (°F) Reactor Temp (°F) Influent Temp – Summer (°F) Air Temp Summer (°F) Earth Around Wall Temp – Summer (°F) Earth Below Floor Temp – Summer (°F) Sp. Heat Sludge1 (Btu/lb*°F) Area Walls (ft2) Area Roof (ft2) Area Floor (ft2) U Walls – Concrete1 (Btu/hr*ft2*°F) U Roof – Concrete1 (Btu/hr*ft2*°F) U Floor – Concrete1 (Btu/hr*ft2*°F) Gas Generation1 (ft3/lb VS) Gas Heat Content1 (Btu/ft3) (HHV) VS Removal Percent at 20 days2 (%) VS Removed (lbs/day) Gas Generation (ft3/day) Heat Potential of Gas (Btu/day) Gas Generation per Capita1 (ft3/day/person) Population Served by POTW (persons) Flow per Capita3 (gal/day/person) Total POTW Flow (MGD) Sources: Complete Mix Circular 13,730 8 8.5 171,625 20,191 2,699 20 0.25 54,920 2,746 60 20 40 40 40 40 98 78 78 47 47 1.0 3,769.9 2,827.4 2,827.4 0.12 0.28 0.30 12 650 55 7,552 90,618 58,901,700 1 90,618 100 9.1 1. Metcalf and Eddy, “Wastewater Engineering and Design, 4th Edition”, 2003. 2. Eckenfelder, “Principals of Water Quality Management,” 1980. 3. Great LakesUpper Mississippi Board of State and Provincial Public Health and Environmental Managers, “Recommended Standards for Wastewater Facilities (TenState Standards),” 2004. 42PDF Image | Combined Heat and Power at Wastewater Treatment Facilities
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