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Abstract
Methane fermentation of low-solids dairy waste was studied in horizontal, unagitated, isothermally maintained, tubular fermenters. The methane fermentation characteristics at temperatures of 20, 30 and 40°C and hydraulic retention times (HRTs) of 1, 2, 4, 6, 8 and 10 days are reported. Methane production per fermenter volume was greatest at a 1 day HRT; production of 0·22, 0·31 and 0·32 m 3 of methane/m 3 fermenter volume/day occurred at 20, 30 and 40°C, respectively. Maximum methane production per unit of substrate fed, however, occurred at longer HRTs. Maximum methane production was: 0·55 m 3 at 20°C and an 8 day HRT; 0·55 m 3 at 30°C and an 8 day HRT; 0·82 m 3 at 40°C and an 8 day HRT (all per kg volatile solids fed).
Published Version
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