深圳荔枝湖富营养化成因和总磷模型分析

Pollutant Loading Analyses and TP Model Calculation for Eutrophication in Lichee Lake in Shenzhen

通过9个月水质连续监测,分析了深圳荔枝湖污染来源和负荷.外源污染主要来自雨水管网溢流,降雨后湖水水质急剧恶化,TP浓度可高达0.347 mg/L.底泥释放试验表明,总氮第1周平均释放速率为0.036 8 g/(m2.d),磷源在好氧条件下释放较少.并建立荔枝湖四湖总磷串联模型,通过2组实测数据进行校验,计算结果和实测值吻合;在此基础上,用模型分析,设计初始条件下,采用组合治理工艺每天连续运行24 h,则需要2.18 d可将荔枝湖各湖TP浓度恢复为0.1 mg/L以下,达Ⅳ类地表水标准.

Based on 9-month consecutive in situ monitoring data,this paper investigated the pollutant sources and loadings of eutrophication in Lichee Lake in Shenzhen.The external source mainly comes from overflow of storm sewer system,which will deteriorate water quality in lake.Total phosphorus concentration was measured with a maximum of 0.347mg/L after overflow.The sediment release experiment showed that the release rate of total nitrogen during the first week was about0.0368g/（m^2·d）,and less release of total phosphorus from sediment into water was measured under aerobic condition.The total phosphorus modeling of each sub-lake for Lichee Lake was developed.The model had a good agreement with 2 groups of monitoring data.And calculation results showed that,it will take 2.18 days subject to 24-hour operations of the integrated treatment project per day to improve water quality in Lake to satisfy the National Standard Ⅳ of surface water.