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Currently, many municipal sewage treatment plants cap- ture sludge and convert it to biogas through anaerobic digestion and use the gas on-site to power the facility.
If the anaerobic digester facilities could be expanded to accommodate the collection and processing of organic food waste, the additional biogas generated could turn sewage treatment plants into power plants.
Collecting organic food waste and delivering it to an expanded anaerobic digester at a centralized municipal sewage treatment plant takes advantage of existing citywide systems and has the advantage of aggregating waste at the city scale.
The waste from a mixed-use infill project of 5,000 units of housing will produce ten tons of organic food waste per day, enough to justify a small anaerobic digester.
It is feasible to supplement the anaerobic digester with sludge collected from sewage settling tanks or pumping stations in the neighborhood and to expand the fuel source for the cogeneration plant to include dry combustible waste such as yard waste and construction waste.
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