Journal
ENVIRONMENT INTERNATIONAL
Volume 137, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.envint.2020.105549
Keywords
Biological sulfide removal (BISURE); Partial sulfide oxidation (PSO); Process indicator; Sulfur selectivity; Sulfur secretion
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Funding
- Major Scientific and Technological Program for Water Pollution Control and Treatment of China [2017ZX07206-002]
- Major Scientific and Technological Specialized Project of Zhejiang Province [2015C03013]
- Fundamental Research Funds for the Central Universities [2017xzzx010-03]
- National Natural Science Foundation of China [51608474]
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Biological desulfurization technology is a sustainable process for the sulfide removal from biogas, which has multiple advantages. In this study, a biological sulfide removal (BISURE) system was established to investigate the working performances and process mechanisms. The results showed that the sulfide removal rate was 2.30 kg-S/(m(3) d), the sulfide removal efficiency was higher than 98%, the sulfur production rate was 1.76 kg-S/(m(3) d), the sulfur selectivity was 75.02 +/- 3.63% and the main form of products (sulfur compounds) was Rosickyite-S and S-8. The performance of BISURE system was supported by the dominant genus (abundance more than 60%) of sulfur-oxidizing bacteria (SOB) which shifted to Thiovirga at the high SLR. The sqr and dsrA genes could serve as the indicators for the pathway of two-step sulfide oxidation, i.e. partial sulfide oxidation (PSO, sulfide -> sulfur) and complete sulfide oxidation (CSO, sulfur -> sulfate). The sulfur selectivity was improved by enhancing PSO and inhibiting CSO with the indication of two genes. The cellular sulfur secretion was revealed, and the outer-membrane vesicles (OMVs)-dependent sulfur-secreting hypothesis was proposed to explain the transportation of elemental sulfur from inside to outside of SOB cells. The findings of this work provide a new perspective to understand the sulfur selection of sulfide bio-oxidation and the sulfur secretion of SOB cells so as to promote the development of biological desulfurization technology.
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