期刊
SCIENCE OF THE TOTAL ENVIRONMENT
卷 674, 期 -, 页码 336-343出版社
ELSEVIER
DOI: 10.1016/j.scitotenv.2019.04.206
关键词
Sulfate-reducer; Biocathode; Sulfate reduction; Nitrobenzene removal; Elemental sulfur
资金
- Pearl River S and T Nova Program of Guangzhou, China [201710010031]
- National Key R & D Program of China [2017YFB0903700, 2017YFB0903703]
- National Natural Science Foundation of China [51308557, 51278500, 41471181]
- Guangdong Science and Technology Department [2017A010104007]
This study aimed to enhance treatment of wastewater containing nitrobenzene (NB) and sulfate using biocathode enriched with sulfate-reducing bacteria in microbial electrolysis cell (MEC). Artificial wastewater with 50 mg L-1 NB and 200 mg L-1 sulfate was used as the catholyte. With 0.8 V applied voltage, removal efficiencies of NB and sulfate reached 98% and 34%, respectively, within 36 h. Aniline and sulfide were the main reductive products in the catholyte with concentrations increased to 0.32 and 0.51 mM, which accounted for 97% and 78% of the removed NB and sulfate, respectively. Sulfate-reducer Desulfovibrio sp. and Wolinella sp. played the dominant role in the biocathode for the reductions of sulfate and NB. Analyses of scanning electron microscope and X-ray photoelectron spectroscopy showed the formation of elemental S on the biocathode surface. The relative abundance of sulfur-oxidizing bacterium Thioclava sp. reached 24% on the biocathode. The results indicated that the oxidation process from S2- to S-0 occurred on the biocathode, which provided electrons to biofilm for NB reduction. The MEC with sulfate-reducer enriched biocathode can be used as an alternative to treat complex wastewater containing NB and sulfate. (C) 2019 Elsevier B.V. All rights reserved.
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