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Driver/Benefit Summary Examples Increased Biogas Production Some facilities noted that they are taking on additional waste streams that will boost their biogas production, and CHP was a natural fit to capitalize on the increased fuel availability. Additional waste streams include wastes from other nearby treatment facilities, additional industrial wastes, or FOG. • The Des Moines Metro Wastewater Reclamation Facility noted that it is upgrading its anaerobic digesters to handle additional hauled wastes, and that expanding its existing CHP system will give the facility the ability to make efficient use of the increased biogas generation. Enhanced Biosolid Management Once the decision was made to incorporate anaerobic digesters into the treatment process, all facilities recognized that utilizing the resulting biogas in a CHP system made sense. Treating biosolids in anaerobic digesters reduces biosolid mass, decreasing the burdens associated with drying biosolids on site and/or shipping them to landfills, while also producing biogas that can be used to generate power and heat on site. A couple of facilities noted that the “green” attributes of CHP at WWTFs (i.e., increased efficiency and reduced emissions through the use of renewable biogas), and the myriad other benefits offered by CHP, generated public interest and positive awareness for the facility. Although not a driver for initial installation, WWTFs see the positive response from the public as a benefit and a driver for continued operation. Onsite generation of power at WWTFs can help utilities that operate in constrained areas shed load rather than invest in new generation infrastructure or add additional burden to existing transmission and distribution systems. • The Theresa Street Wastewater Treatment Facility described keeping raw sludge out of landfills through better biosolids management as a key driver for installing anaerobic digesters on site. With the digesters in place, CHP allowed the facility to generate clean power and heat with the resulting biogas. “Green” Publicity/Positive Public Relations • Both the Allentown Wastewater Treatment Plant and the Columbia Boulevard Wastewater Treatment Plant reported that their CHP systems were very well received by their communities and generated a lot of positive buzz. Utility Load Shedding • The Fairfield Water Pollution Control Authority noted that its CHP system not only helps the local utility avoid installing new capacity, but also enables the facility to avoid the premium price paid for electricity during high demand periods. The Fairfield facility is located in Southwestern Connecticut, a highly constrained electric area. that the scheduled facility upgrade allowed them to install a newer CHP system that would help simplify O&M, increase system reliability, and offer increased efficiencies. today, approximately 70 percent of the biogas produced at the facility is derived from hauled waste. The facility plans to take in additional hauled waste and is upgrading its anaerobic digesters to accommodate the increased load. To take advantage of the resulting increased biogas production, the facility plans to install four additional reciprocating engines, two of which will be incorporated with the CHP system. The other two will be used as standby power. • Little Rock, Arkansas, currently has a program in place for pretreatment of FOG to which participants must adhere. The Fourche Creek Treatment Plant is interested in how it might adapt one of its existing digesters to handle FOG, which is a possibility for future expansion. The facility would consider CHP expansion to handle any increases in biogas generation. 33PDF Image | Combined Heat and Power at Wastewater Treatment Facilities
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