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Composting MSW 241
mixing the contents in the bioreactors. From the gasholder the gas is transferred to engines to pro-
duce electricity. The digested slurry is pasteurized at ~7°C for 30 min to produce a material that is
safe for spreading on agricultural land.
The feasibility of applying anaerobic digestion for stabilization of solid wastes generated dur-
ing space missions was investigated (Chynoweth et al., 2003). High-solids leachbed anaerobic
digestion involved solid-phase fermentation with leachate recycling between new and old reactors
for inoculation, wetting, and removal of volatile organic acids during startup. Anaerobic biochemi-
cal methane potential assays were run on several waste feedstocks expected during space missions.
The methane yields ranged from 0.23 to 0.30 L/g of volatile solids added.

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