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FOG and Scum on the Run: Receiving, Heating, Mixing, and Digester Feeding

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Scum and FOG: nuisance or commodity? Using an innovative approach, the 180 MGD capacity Back River Wastewater Treatment Plant is turning scum and FOG from a nuisance into a commodity. This paper describes a project that will provide improvements to better receive, convey, treat, and thicken trucked-in septage and FOG, as well as thicken primary scum, prior to processing in anaerobic digestion. Co-digesting this material more efficiently will improve anaerobic digestion and maximize energy production from the on-site engine generators. Trucked-in septage and FOG will be pre-treated, prior to thickening. Three new septage receiving units will screen and remove debris and grit. The screenings and grit will be discharged to dumpsters, while the liquid flow will be diverted to DAF thickener basins. Two existing out-of-service DAF thickening basins will be retrofitted to operate as a separation process. The screened septage and FOG, as well as the primary scum collected onsite, will be combined in the two existing thickening basins. The thickeners will retain the ability to add Waste Activated Sludge (WAS). Thickened scum/FOG will be digested, together with thickened primary and secondary sludge, in a two-phase, acid-gas anaerobic digestion process.
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Keywords: FOG; Scum; Thickening; anaerobic digestion; heating

Document Type: Research Article

Publication date: 2011-01-01

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