南方城市黑臭水体综合治理——以南宁市竹排江e段(那考河)为例

竹排江e段(那考河)是南宁市典型的城市黑臭水体,亟需进行治理。分析了那考河水质污染特征,识别其主要污染来源;针对污水和初期雨水入河、河道底泥淤积、生态基流匮乏、河道水生态系统严重退化等问题,提出采取控源截污、内源清理、活水保质、生态修复措施进行综合整治,并因地制宜地开发了流域适用的“净水梯田”生态护岸技术,对溢流或径流雨水进行多级净化;采用政府和社会资本合作(PPP)+按效付费的建设模式,治理后那考河水质稳步改善且达到GB 3838—2002《地表水环境质量标准》Ⅳ类水质标准,生态效益显著,水体周边人居与商业环境明显改善。

Comprehensive treatment of urban black and odorous water bodies in southern cities: a case study of Zhupai River e section (Nakao River) in Nanning City

Zhupai River e section (Nakao River Basin) was a typical urban black and odorous water body in Nanning City which was in dire need of governance. The water pollution characteristics of Nakao River were analyzed and the main sources of pollution were recognized. In view of the problems such as the inflow of sewage and initial rainwater into the river, the siltation of river sediment, the lack of ecological base flow and the serious degradation of river water ecosystem, the measures of controlling sources and cutting off pollution, cleaning up internal sources, maintaining the quality of living water and ecological restoration for comprehensive treatment of Nakao River were put forward. The ecological revetment technology of “water purification terraces” suitable for the basin was developed according to the local conditions, so as to carry out multi-stage purification of overflow or runoff rainwater. The construction model of government and social capital cooperation (PPP) + pay-for-performance was adopted. After treatment, the river water quality improved steadily and achieved Grade Ⅳ of Surface Water Environmental Quality Standards(GB 3838-2002), the ecological benefit was remarkable, and the surrounding residential and commercial water environment improved significantly.