Co-Digestion of Wastewater Sludge with Municipal Solid Waste

Description:The co-digestion of wastewater sludge with municipal solids waste (MSW) has become increasingly viable as cities move towards diverting source separated organics (SSOs) away from landfills. This interest is further driven by the need for resource recovery of biogas for heat and power generation, and organic material that that can be beneficially reused as a soil amendment or landfill cover material. Co-digestion at a wastewater treatment plant (WWTP) usually involves the importation of external SSOs such fats, oils and grease (FOG), deicing fluid, and food processing wastes. The treatment of food wastes, agricultural wastes and yard wastes in WWTP digesters is not considered to be practical. A recent study conducted at 312 wastewater treatment plants in California found that the biogas generated through anaerobic digestion at these facilities could be increased by 60 percent by treating suitable imported SSOs at the plant. 114 of the 312 plants in the study currently have anaerobic digesters, many with unused excess capacity. Wet digestion and dry digestion technologies have also been developed for the anaerobic treatment of SSOs at MSW management facilities. In cities with effective SSO programs, the relatively small mass of wastewater sludge generated can be co-digested at the MSW facility. This paper presents some of the benefits and challenges related to implementing co-digestion programs at both WWTPs and MSW management facilities.

Authors: Rabinowitz, Barry

Subjects: Wastewater, Residuals and Biosolids

Tags:source separated organics (SSOs),sludge,resource recovery,co-digestion,biogas,anaerobic,WWTP,ac2012

Citation:2012 BCWWA Annual Conference, Session 8, Penticton

Publication Date:Aug 7th, 2012 Upload Date:Aug 7th, 2012

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