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Policy Brief: Impacts of Anaerobic Digesters (PDF)
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Anaerobic digesters are facilities that decompose organic waste, separating biogas from solids and liquids, called “digestate.” Biogas can be used on-site or processed into purified pipeline-grade biomethane for electricity or transportation. On confined animal feeding operations (CAFOs), a biodigester may be a cover on a cesspit. After the methane is captured, CAFO operators dump untreated digestate full of heavy metals and biological hazards like thermotolerant E.coli onto farm fields as “fertilizer.”
In this policy brief from FLOW, we break down the unintended environmental and economic impacts of anaerobic digesters, and the hidden costs of biogas production. We also make recommendations for how the state of Michigan should regulate digesters to protect our groundwater, and ultimately, the Great Lakes.
