Journal
BIORESOURCE TECHNOLOGY
Volume 171, Issue -, Pages 159-167Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2014.08.059
Keywords
Polyhydroxyalkanoates (PHA); Bacterial consortium; Sludge fermentation liquid (SFL); Pilot scale
Funding
- National key project on the Water Pollution Control and Management in China [2012ZX07301-001]
- Tsinghua University Initiative Scientific Research Program [20101081834, 20121087922]
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The generation of polyhydroxyalkanoates (PHA) from excess sludge fermentation liquid (SFL) was studied at lab and pilot scale. A PHA-accumulated bacterial consortium (S-150) was isolated from activated sludge using simulated SFL (S-SFL) contained high concentration volatile fatty acids (VFA) and nitrogen. The maximal PHA content accounted for 59.18% in S-SFL and dropped to 23.47% in actual SFL (L-SFL) of the dry cell weight (DCW) at lab scale. The pilot-scale integrated system comprised an anaerobic fermentation reactor (AFR), a ceramic membrane system (CMS) and a PHA production bio-reactor (PHAR). The PHA content from pilot-scale SFL (P-SFL) finally reached to 59.47% DCW with the maximal PHA yield coefficient (Y-P/S) of 0.17 gPHA/gCOD. The results indicated that VFA-containing SFL was suitable for PHA production. The adverse impact of excess nitrogen and non-VFAs in SFL might be eliminated by pilot-scale domestication, which might resulted in community structure optimization and substrate selective ability improvement of S-150. (C) 2014 Elsevier Ltd. All rights reserved.
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