Long-term effect of water diversion and CSOs on the remediation of heavy metals and microbial community in river sediments

被引:10
作者
Wu, Jun [1 ,2 ]
Xu, Zuxin [1 ,2 ]
Li, Huaizheng [1 ,2 ,3 ]
Li, Peng [1 ]
Wang, Mei [1 ]
Xiong, Lijun [4 ]
Zhang, Jin [5 ]
机构
[1] Tongji Univ, Coll Environm Sci & Engn, Shanghai 200092, Peoples R China
[2] Shanghai Inst Pollut Control & Ecol Secur, Shanghai 200092, Peoples R China
[3] Tongji Univ, Minist Educ, Key Lab Yangtze River Water Environm, Shanghai 200092, Peoples R China
[4] Shanghai Acad Environm Sci, 508 Qingzhou Rd, Shanghai 200233, Peoples R China
[5] Jinan Univ, Inst Groundwater & Earth Sci, Guangzhou 510632, Guangdong, Peoples R China
关键词
bacterial community composition; combined sewer overflow; heavy metals; microbial; COMBINED SEWER OVERFLOWS; ORGANIC MICROPOLLUTANTS; 14; ANTIBIOTICS; WASTE-WATER; LAKE CHAOHU; QUALITY; BIODEGRADATION; PERFORMANCE; AFFINITY; PROJECTS;
D O I
10.2166/wst.2019.242
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Untreated combined sewer overflows (CSOs) cause serious water pollution problems. In this study, the effects of CSO-induced heavy metals and the remediation practice of installation of a long-term water diversion (LTWD) on the microbial environment in river sediments were analyzed in an inland river. The Zn, Cd, Cr, and Cu contents in sediments and water were analyzed. DNA extraction and polymerase chain reaction analysis were conducted based on the Illumina MiSeq platform. The results showed that CSOs have a significant adverse impact on the diversity of microbial populations in river sediments. The LTWD is helpful in improving the richness of microorganisms and the proportion of Gram -ves, but it is challenging to reduce the accumulation of heavy metals in the sediment. The correlation analysis shows a strong relationship between some metabolic pathways and Zn and Cd accumulation in river sediments. Some detoxification compound metabolisms are also promoted at these sites. Thus, chronic exposure to environmental heavy metals from CSOs decreases the river microbial community, and further affects the ecological environment of the river. Therefore, without eliminating CSOs or reducing overflow frequency, it is difficult to alleviate the accumulation of heavy metals in river sediments and improve river ecology via water diversion alone.
引用
收藏
页码:2395 / 2406
页数:12
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