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Production of methane by bacterial action.
U S Pat 3 640 846 1972 Feb; :1-3
Addition of coal increased the yield of methane during the anaerobic fermentation of sewage. Fine coal (100 g) -325 mesh, was used per 2 l of sludge and fermentation for 1,300 h at 95 deg.-100 Deg. F.
U.S. Pat. 3,640,846
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