The community digester located near Waunakee is the stateÕs first to process manure from more than one farm. Roughly 100,00 gallons of manure from 2,400 cows on three nearby farms is pumped daily through underground pipes to the digester. Its purpose is to keep phosphorus from polluting the Yahara watershed.

Manure digesters seen as best hope for curbing lake pollution, but drawbacks remain

Since 2001, manure digesters have been popping up across the state. Wisconsin now has 34, the most in the nation, with two more scheduled to begin operating by 2015. In all these digesters, bacteria eat biomass like manure, food scraps or whey and emit energy in the form of methane gas. Continue Reading

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