Journal
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
Volume 27, Issue 32, Pages 40392-40404Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s11356-020-09805-x
Keywords
Black-odor sediment; Redox potential; Microbial community succession; Functional genes; Iron; sulfate reducers; Field investigation
Categories
Funding
- National Key Research and Development Program of China [2016YFE0106600]
- National Natural Science Foundation of China [41501278]
- Science and Technology Program of Guangzhou, China [2016201604030057, 201806010050]
- Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology (Sun Yat-sen University) [2018K10]
- Science and Technology Program by Guangdong Financial Department [PM-zx097201601-024]
- SCIES Science & Technology Project [PM-zx703201512-044, PM-zx703-201602-032]
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The black-odor phenomenon in polluted urban rivers is a serious environmental problem that has received increasing attention in the recent years. The low redox potential (less than - 100 mV) in the sediment is considered to be the key factor causing the occurrence of black-odor phenomenon. Here, we studied the structure and function of the microbial community during the remediation of urban rivers. Results showed a clear improvement in water quality after undergoing river remediation processes. The on-site treatments showed a succession in the microbial composition and their predicted functions. The primary iron- and sulfur-reducing bacteria (Thiobacillus,Sulfuricurvum, andSulfursoma) and the related reactions rapidly decreased after the dredging treatment but reappeared after a year. The structure and abundance of nitrogen and methane participants were also affected by river remediation process. These results indicated that although the water quality temporarily improved shortly after a dredging process, a recurrence of the black-odor phenomenon may occur as a result of the rebound in the microbial communities.
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