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Anaerobic Biogas

Organization(s) Narragansett Bay Commission
Project Description Anaerobic digestion is commonly used to convert sewage sludge into methane-containing biogas. The process is a good way to manage the large amount of sludge generated daily by the sewage treatment process, and it produces an energy surplus. Harnessing the energy from the biogas through an efficient combustion process destroys the methane. This is beneficial because methane is a greenhouse gas that is 20 times stronger than carbon dioxide. The NBC Bucklin Point WWTF produces approximately 200,000 cubic feet/day of biogas containing 60 percent methane. Currently, a major portion of this biogas is burned in an on-site boiler to heat the facility's three primary digesters – any excess biogas is flared. Using a $25,000 matching funds grant from the RISEO, NBC is studying how to use this biogas more effectively. Preliminary results indicate that it is most economically feasible to clean the biogas and generate electricity and useful heat in a 500 kW CHP system, such as a micro-turbine or reciprocating engine.

Contaminants in municipal wastewater can interfere with the energy recovery process. Volatile siloxane compounds that are commonly found in many personal care products transfer out of the sludge and into the biogas and subsequently foul the energy recovery equipment. As part of the feasibility study, NBC will determine the optimal methods to clean and use the biogas that will save money and reduce demand on the energy infrastructure. An outside engineering consultant is being chosen to confirm NBC's preliminary findings and to assist with the selection and final design of a system.

 
Project Contact
Name Barry Wenskowicz
Phone 401-461 8848 ext. 329
E-mail
 
Project Keywords
Processes Wastewater Treatment
Areas of P2 Expertise Energy Efficiency
Industrial Sectors Water Use/Treatment
Activity Keywords Funding and grants, Research and development
 
Source
Newsletter Northeast Assistance & Pollution Prevention News - Vol. 17 No. 1, Spring 2007 [PDF]

 

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