Sherry - I have seen methane recovery at the Ina Road wastewater treatment plant that processes about 25 to 30 million gallons per day. The recovered gas is used to co-generate electricity for the plant. Contact Information: http://www.ci.tucson.az.us/pubutil.htm Ina Road Treatment Plant Capacity: http://www.azstarnet.com/~trwc/info4.htm Tom Barron P2 Consultant