城市内湖水质改善对策研究——以广州市南湖为例

Study on water quality improvement of urban inner lake: A case study of Nanhu Lake in Guangzhou

随着社会经济的快速发展,城市内湖水体的环境质量也受到越来越多的不利影响。以广州市南湖及其排水流域内相关排水管网为研究对象,通过构建水动力及水质模型,分析不同情景下南湖水质变化情况。结果表明,底泥疏浚和调蓄对南湖水质改善起到明显作用,并对工程实施后的水环境质量进行了预测,结果显示:在暴雨条件下,南湖全水域COD、TP均可满足《地表水环境质量标准》(GB 3838-2002)Ⅴ类标准,TN基本可满足Ⅴ类标准,局部区域会出现超标情况;同时建议将调蓄池中的污水经预处理后,通过人工湿地重新注入南湖,以维持南湖的"水平衡"。

With the rapid development of social economy,the environmental quality of urban inner lakes has been more and more adversely affected.Taking Nanhu and its drainage network in Guangzhou as the research object,the water quality changes of Nanhu under different scenarios were analyzed by constructing hydrodynamic and water-quality models.The results show that the dredging and storage play a significant role in improving the water quality of Nanhu Lake,and the water quality after the implementation of the project is predicted.The results show that under the condition of rainstorm,CODcr and TP in the whole water area can meet the class V standard of environmental quality standard for surface water(GB 3838-2002),TN can basically meet the class V standard,and some areas will exceed the standard.In order to maintain the"water balance"of Nanhu Lake,the sewage from the storage tank is pretreated and then re-injected into Nanhu Lake through constructed wetland.