Abstract
Pig waste (PW) and paper sludge (PS) possess complementary properties that can be combined for successful anaerobic digestion. Biochemical methane potential (BMP) tests revealed that a PW:PS 3:1 (v/v) ratio had the highest normalized CH(4)-COD removal (54%), while PS had the lowest value (11%) and PW had 44%. Batch BMP tests revealed a significant decrease in lag times for methane production in the order of PW:PS 1:3 (14 days)<PW:PS 1:1 (17 days)<PW:PS 3:1 (20 days)<PW (23 days). Hydrolysis constants (k(hyd)) were higher for all PW:PS combinations than for either of the individual waste streams: 0.004 d(-1) (PS)<0.02 d(-1) (PW)<0.024 d(-1) (PW:PS 3:1)<0.03 d(-1) (PW:PS 1:1)<0.05 d(-1) (PW:PS 1:3). Semi-continuous reactors performing co-digestion of PW and PS at a 2:1 ratio showed 1.5 times higher methane production than baseline PW-only reactors, confirming the BMP results.
Published Version
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