Applying rhamnolipid to enhance hydrolysis and acidogenesis of waste activated sludge: retarded methanogenic community evolution and methane production.

ABSTRACT: Recently, bio-surfactants, like rhamnolipid (RL), have been used as efficient pre-treatments to enhance the accumulation of short-chain fatty acids (SCFAs) from waste activated sludge (WAS). The current study found that SCFA accumulation occurred with evolutional variation in methanogen with RL (0.04 g RL g^-1 TSS), resulting in a retarded methane production over a period of 20 days. However, a slow methane production was only detected before the 18^th day, while the concentration of acetic acid (HAc) accumulated to a peak at 2616.94 ± 310.77 mg L^-1 in the presence of RL, which was 2.58-fold higher than the control assay. During the retarded methane production, the concentration of dissolved hydrogen also increased to 49.27 ± 6.02 μmol L^-1, in comp

SUBMITTER: Li J 

PROVIDER: S-EPMC9059744 | biostudies-literature | 2019 Jan

REPOSITORIES: biostudies-literature