| 引用本文: | 曾祥平,刘杰,丁文川,曾晓岚,张玉,罗万申.滇池环湖截污体系优选截留率及其影响因素研究.湖泊科学,2024,36(6):1757-1768. DOI:10.18307/2024.0623 |
| Zeng Xiangping,Liu Jie,Ding Wenchuan,Zeng Xiaolan,Zhang Yu,Luo Wanshen.Optimized interception rate of interception system around Lake Dianchi and influence factors. J. Lake Sci.2024,36(6):1757-1768. DOI:10.18307/2024.0623 |
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| 滇池环湖截污体系优选截留率及其影响因素研究 |
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曾祥平1,2, 刘杰3, 丁文川1,2, 曾晓岚1,2, 张玉4, 罗万申4
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1.重庆大学, 三峡库区生态环境教育部重点实验室, 重庆 400045;2.重庆大学, 低碳绿色建筑国际联合研究中心, 重庆 400045;3.武汉大学, 水资源工程与调度全国重点实验室, 武汉 430072;4.中国市政工程西南设计研究总院有限公司, 成都 610081
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| 摘要: |
| 农村农业非点源污染是滇池污染负荷的主要来源之一,环湖截污治污体系对农村农业污水的截留具有重要意义。为实现对该体系的自动化控制,有效支撑智能化控制平台的高效运行,本研究在前期通过对比分析,确定截污治污体系截流井采用基于总磷(TP)浓度阈值控制模式对农村农业非点源污染物负荷截留效果最好的基础上,针对环湖截污治污体系现状条件下,采用TP 浓度阈值控制模式对应的优选截留率进行研究,探讨了重现期和雨峰系数的影响,并就选择性截留后枯、平和丰水年农业农村非点源污染负荷的入湖系数进行计算。结果表明,(1)当干渠发生溢流时,存在优选TP浓度阈值,当截留TP浓度大于等于该阈值的径流时,可以使溢流进入滇池的污染物负荷最小,此时截留径流量与总径流量的比值即为优选截留率。(2)随重现期的增大,TP浓度阈值的设定值整体呈减小趋势,所截留的污染物平均浓度减小,优选截留率减小。(3)随雨峰系数增大,TP浓度阈值的设定值增大,优选截留率变化不大。(4)考虑基于TP浓度阈值控制模式的环湖截污系统截留作用后,滇池农业农村非点源污染负荷的入湖系数:枯、平、丰水年COD分别为0.09、0.14、0.23;总氮分别为 0.10、0.22、0.31;TP分别为 0.07、0.12、0.19,均较不考虑环湖截污系统截留作用时显著降低。(5)采用TP浓度阈值控制模式,在枯、平及丰水年均可有效提升截污干渠末端水质净化厂的进水浓度,增强处理工艺的运行稳定性。 |
| 关键词: 优选截留率 TP 浓度阈值控制模式 农村农业污水 截污体系 滇池流域 重现期 雨峰系数 入湖系数 |
| DOI：10.18307/2024.0623 |
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| 基金项目:国家水体污染控制与治理科技重大专项(2012ZX07102-001-004)和重庆大学大型仪器设备开放基金项目(202303150061,202303150125)联合资助。 |
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| Optimized interception rate of interception system around Lake Dianchi and influence factors |
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Zeng Xiangping1,2, Liu Jie3, Ding Wenchuan1,2, Zeng Xiaolan1,2, Zhang Yu4, Luo Wanshen4
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1.Key Laboratory of Ecological Environment in Three Gorges Reservoir Area, Ministry of Education, Chongqing University, Chongqing 400045, P. R. China;2.International Joint Research Center for Low Carbon Green Buildings, Chongqing University, Chongqing 400045, P. R. China;3.State Key Laboratory of Water Resources Engineering and Management, Wuhan University, Wuhan 430072, P. R. China;4.Southwest Design and Research Institute of China Municipal Engineering, Chengdu 610081, P. R. China
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| Abstract: |
| Rural agricultural non-point source pollution is one of the main sources of pollution load in Lake Dianchi. The interception and treatment system around the lake is of great significance to the interception of rural agricultural sewage. The previous result of our research group by comparative analysis indicated that total phosphorus (TP) concentration threshold-based control mode for the interception wells of the system is most effective. In order to achieve automated control of the system and support the efficient operation of the intelligent control platform, corresponding to the TP concentration threshold control mode, the optimized (runoff) retention rate, the influences of the recurrence interval and peak intensity position coefficient on it under the current conditions were studied. In low, normal, and high flow years, the lake entry coefficients of the rural agricultural non-point source pollution loads were calculated after interception. The results showed that: (1) when the main canal overflowed, it could minimize the pollutant load overflowed into Lake Dianchi with the existing optimized TP concentration threshold, and the corresponding ratio of the intercepted runoff to the total runoff was the optimized retention rate; (2) with the increase of the recurrence interval, the TP concentration threshold presented a decreasing trend, as well as the average concentration of pollutants intercepted and the optimized retention rate; (3) with the increase of the peak intensity position coefficient, the TP concentration threshold increased and the optimized retention rate remained steady; (4) considering interception of the system with TP concentration threshold control model, the lake entry coefficients of the rural agricultural non-point source pollution loads in low, normal, and high flow years were: COD 0.09, 0.14, 0.23, TN 0.10, 0.22, 0.31, and TP 0.07, 0.12, 0.19, respectively, which were significantly lower than those without interception. (5) with TP concentration threshold control mode, the influent concentration of pollutants in the water quality purification plant at the end of main canal could be increased effectively, as well as the operational stability of the treatment processes. |
| Key words: Optimized interception rate TP concentration threshold-based control model rural agricultural sewage interception system Lake Dianchi Basin recurrence interval peak intensity position coefficient lake entry coefficient |
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