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论文类型：期刊论文

发表时间：2015-04-01

发表刊物：BIORESOURCE TECHNOLOGY

收录刊物：SCIE、EI、PubMed、Scopus

卷号：182

页面范围：75-81

ISSN号：0960-8524

关键字：Sulfide removal; Nitrate-reducing; Dissolved oxygen; Elemental sulfur regeneration

摘要：A continuous reactor in microaerobic conditions was adopted for sulfide-oxidizing, nitrate-reducing and elemental sulfur (S-0) regenerating, simultaneously. The results showed that appropriate dissolved oxygen (DO) enhanced S-0 regeneration efficiency, sulfide oxidation efficiency, and nitrate reduction efficiency. When the DO concentration was 0.1-0.3 mg L-1, the microaerobic bioreactor simultaneously converted 8.16 kg-S m(-3) d(-1) of sulfide to S-0 and 2.48 kg-N m(-3)d(-1) of nitrate to nitrogen with the sulfide and nitrate removal efficiency of 100% and 90% respectively. Compared with anaerobic sulfide and nitrate removal process previously reported, the loading sulfide was higher and more S-0 was generated during the operation in microaerobic reactor. Analysis using the 16S rDNA gene clone library revealed that Azoarcus, Thauera, Paracoccus, Sulfurospirillum, Arcobacter and Clostridium were the dominant microorganisms in the sulfide and nitrate removal system. (c) 2015 Elsevier Ltd. All rights reserved.