KOUDian-liang,LIUCun-li,WEIJing.Case Study and Analysis of Water Environment Ecological Restoration of Mingyue Lake in Nanning[J].China Water & Wastewater,2025,41(18):106-111.
南宁市明月湖水环境生态修复案例及分析
- Title:
- Case Study and Analysis of Water Environment Ecological Restoration of Mingyue Lake in Nanning
- 摘要:
- 由于长期受到合流制排水系统和周边地块初期雨水径流引起的面源污染影响，南宁市明月湖河道严重淤积、水生态系统脆弱、水体自净能力差，水质长期处于地表水劣Ⅴ类且伴有黑臭现象。为改善这一状况，采用“控源截污、内源治理、生态修复”的技术路线，系统性推进明月湖水环境治理工作。在确保河道行洪功能的前提下，通过降低水体常水位标高以增强水体流动性，提升水体自净能力；同时，通过排口上游错混接改造、末端截污及河道清淤等措施，有效控制污染源。在治理过程中融入海绵城市理念，利用人工湿地对污水处理厂尾水进行深度处理后作为生态补水回注明月湖；对湖中裸露岛屿进行加固改造，将其转变为生态岛，促进区域生态系统的恢复；此外，在滩涂湿地成功培育淡水红树林，进一步增强区域生态功能。经过综合治理，除总氮外，明月湖水质稳定达到地表水Ⅳ类标准，具有显著的生态效益和社会效益。
- Abstract:
- Mingyue Lake in Nanning experienced severely silted up and had fragile aquatic ecosystem, poor self-purification capacity, and persistent black and odorous water conditions, with the water quality consistently categorized as worse than level Ⅴ standard, due to long-term impact of non-point source caused by combined drainage system and initial runoff from surrounding plots. To address these challenges, the Mingyue Lake water environment governance project adopted a comprehensive technical strategy integrating “source control and pollution interception, internal pollution management, and ecological restoration” to systematically advance the restoration process. While ensuring the water body’s flood conveyance function, the lake’s self-purification capacity is improved by reducing the normal water level to enhance water circulation. Additionally, pollution source control is achieved through upstream intercepting and mixed connection transformation of discharge outlets, end-of-pipe interception, and riverbed dredging. The project also integrated the sponge city concept, utilizing constructed wetlands to further treat effluent from the wastewater treatment plant, which was then reused as ecological replenishment water for Mingyue Lake. Exposed islands were reinforced and transformed into ecological islands to promote the recovery of the regional ecosystem. Furthermore, the successful cultivation of mangrove forests in the intertidal wetlands further enhanced the ecological functionality of the area. Through the implementation of these integrated measures, the water quality of Mingyue Lake has been stabilized at the level Ⅳ of surface water standard, yielding significant ecological and social benefits.
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