State Environmental Protection Key Laboratory of Urban Ecological Environment Simulation and Protection, South China Institute of Environmental Sciences, Ministry of Ecology and Environment of China, Guangzhou, 510535, China.
Guangdong Provincial Key Laboratory of Microbial Culture Collection and Application, Guangdong Institute of Microbiology, Guangzhou, 510070, China.
Environ Sci Pollut Res Int. 2020 Nov;27(32):40392-40404. doi: 10.1007/s11356-020-09805-x. Epub 2020 Jul 14.
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, and Sulfursoma) 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.
城市污染河流中的黑臭现象是一个严重的环境问题，近年来受到了越来越多的关注。沉积物中较低的氧化还原电位（小于-100 mV）被认为是导致黑臭现象发生的关键因素。在这里，我们研究了城市河流修复过程中微生物群落的结构和功能。结果表明，经过河流修复处理后，水质明显改善。现场处理显示微生物组成及其预测功能的连续变化。主要的铁和硫还原菌（硫杆菌、硫卷曲菌和硫磺菌）及其相关反应在疏浚处理后迅速减少，但一年后又重新出现。氮和甲烷参与者的结构和丰度也受到河流修复过程的影响。这些结果表明，尽管疏浚处理后水质暂时得到改善，但由于微生物群落的反弹，黑臭现象可能再次发生。
