Sunday, December 04, 2011
Sludge To Fertilizer II
Someone was thinking when they engineered this public works project. The byproduct of the digestion process is 70 percent methane gas, which is captured and piped to boilers that generate enough heat to warm the buildings on the site as well as for the heat-dependent treatment processes. The steam from those boilers is sent through a steam turbine generator (STG) producing an average of approximately 3 megawatts of electricity. The digested sludge from the giant eggs leaves Deer Island through the Inter-Island Tunnel to MWRA's pelletizing facility at Fore River in Quincy, where it is further processed into a fertilizer product.