Journal
INTERNATIONAL BIODETERIORATION & BIODEGRADATION
Volume 114, Issue -, Pages 24-30Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ibiod.2016.05.014
Keywords
WAS alkaline fermentation; VFAs; Bio-surfactants; Illumina sequencing; Microbial community
Funding
- National Science and Technology Pillar Program [2012BAC11B04]
- National Natural Science Foundation of China [51108333, 51478325]
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This study investigated the effects of three types of bio-surfactants (BS), namely, saponin (SP), surfactin (SF), and rhamnolipid (RL), with alkaline conditions on volatile fatty acid (VFA) production and microbial community in sludge fermentation. BS combined with a pH of 9 significantly enhanced hydrolase activities, promoted VFA production and inhibited methanation. SP & pH 9 was more efficient in converting organics to VFAs and thus achieved the highest yield of 425.2 mg COD/g VSS, which was 1.5 times that at pH 10. The lower negative effect of SP on metabolic potential and diversity than that of SF or RL was confirmed through a Biolog assay. Illumina-sequencing further proved that the relative abundances of acidogens in SP & pH 9 were higher than those in other tests, including Proteiniclasticum, Fusibacter, Macellibacteroides and Petrimonas et al. This study provided a strategy for plant-derived SP applications in sludge moderate alkaline fermentation to enhance VFA production. (C) 2016 Elsevier Ltd. All rights reserved.
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