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论文类型：期刊论文

发表时间：2016-01-01

发表刊物：CHEMICAL ENGINEERING JOURNAL

收录刊物：SCIE、EI、ESI高被引论文

卷号：283

页面范围：167-174

ISSN号：1385-8947

关键字：WAS fermentation liquid; Sulfide oxidization; Nitrate reduction; Elemental sulfur generation; Microaerobic

摘要：Possible use of waste activated sludge (WAS) fermentation liquid as carbon and energy source for the growth and activity of sulfide-oxidizing bacteria (SOB) and nitrate-reducing bacteria (NRB) for the treatment of enriched sulfide and nitrate under microaerobic conditions was studied for the first time. The present bioreactor simultaneously converted 100% of sulfide to sulfur and 95% of nitrate to nitrogen while removing 92% of COD, with loading of 8.52 kg-S.m(-3) d(-1), 2.53 kg-N.m(-3) d(-1) and 25.13 kg-COD.m(-3) d(-1). This outcome was much better than those reported previously in literature. This work demonstrated that WAS fermentation liquid not only was a potential alternative to traditional SOB and NRB substrates but also had direct implication for sustainable operation of SOB and NRB bioreactors for treating enriched sulfide and nitrate. The results of polymerase chain reaction of 16S rDNA analysis confirmed the sulfide oxidation, denitrification and chemical oxygen demand (COD) removal in the micro-aerobic reactor and showed that Sulfurospirillum sp., Thauera sp., Azoarcus sp., Arcobacter sp. and Clostridium sp. were the dominant bacteria in the bacterial community. (C) 2015 Elsevier B.V. All rights reserved.