首页> 外文期刊>Journal of Environmental Management >Responses of water quality and phytoplankton assemblages to remediation projects in two hypereutrophic tributaries of Chaohu Lake
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Responses of water quality and phytoplankton assemblages to remediation projects in two hypereutrophic tributaries of Chaohu Lake

机译:巢湖两个富营养化支流水质和浮游植物组合对修复工程的响应

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摘要

Water shortages and the presence of point and diffuse source pollution have caused a serious deterioration in water quality in two tributaries (the Tangxi River and Shiwuli River) of Chaohu Lake, China. To reduce nutrient pollution and suppress harmful algal blooms (HABs), hard engineering and ecological remediation projects were implemented. A post-project investigation from 2013 to 2016 was carried out to evaluate the outcome of the remediation projects by monitoring the seasonal and spatial variations in water quality and the phytoplankton community. In the Tangxi River, the average total phosphorus (TP) concentrations in the four seasons were below 0.5 mg L-1, with the lowest concentration (0.29 +/- 0.12 mg L-1) found in autumn. Remediation measures including sediment dredging, riparian buffer zone creation, downstream wetland park construction, and water augmentation using reclaimed water and filtered lake water might combine to promote P source mitigation. Moreover, the percentage of bloom-forming cyanobacteria (i.e., Microcystis, Aphanizomenon, Anabaena, Osanatoria, Phormidium and Planktothrix) in the phytoplankton assemblage and the biomass of the dominant species indicated successful HAB control. In the Shiwuli River, water quality improvements and phytoplankton responses have been observed since 2015 after the upgrading of a local wastewater treatment plant (WWTP) with effluent that was used for flow augmentation. Nevertheless, there is still room for improvement via increasing the river self-purification ability (e.g., the creation of downstream wetlands and riparian buffer zones) and promoting water augmentation according to the experience gained in the remediation projects of the Tangxi River.
机译:巢湖的两个支流(汤溪河和十五里河)的缺水以及点源和扩散源污染的存在已导致水质严重恶化。为了减少营养物质污染并抑制有害藻华(HABs),实施了艰巨的工程和生态修复项目。 2013年至2016年进行了项目后调查,通过监测水质和浮游植物群落的季节性和空间变化来评估整治项目的成果。在汤溪河,四个季节的平均总磷(TP)浓度低于0.5 mg L-1,而秋季的最低浓度(0.29 +/- 0.12 mg L-1)。补救措施包括泥沙疏,、河岸缓冲区创建,下游湿地公园建设以及使用再生水和过滤后的湖水增水,可能会促进缓解P源。此外,浮游植物组合中形成大花的蓝细菌(即微囊藻,Aphanizomenon,鱼腥藻,Osanatoria,Phormidium和Planktothrix)的百分比和优势种的生物量表明成功控制了HAB。自2015年以来,在Shiwuli河中,对当地废水处理厂(WWTP)进行了升级改造后,已经观察到水质改善和浮游植物的反应,废水被用于增加流量。尽管如此,根据汤溪河整治工程的经验,通过提高河流的自净能力(例如创建下游湿地和河岸缓冲带)和促进增水,仍有改善的空间。

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