生态砾石床在低污染水体治理中的应用研究

Study on Application of the Ecology Gravel Bed in Treatment of the Low-pollution Water Body

[目的]分析生态砾石床对荔枝湖湖水各种污染物的去除效果。[方法]以深圳市荔枝湖湖水为试验进水,以CODCr、总氮、氨氮、总磷、叶绿素a为水质分析指标,研究生态砾石床对荔枝湖湖水各种污染物的去除效果。[结果]在进水CODCr为16.7～30.7 mg/L、总氮为0.78～1.55 mg/L、氨氮为0.10～0.70 mg/L、总磷为0.057～0.120 mg/L和叶绿素a为15.7～47.7 mg/m3的条件下,生态砾石床系统对各污染物的平均去除率分别为36.8%、5.3%、>80.0%、52.4%、37.7%,出水浓度分别为10.2～21.1 mg/L、0.77～1.52 mg/L、<0.04 mg/L、0.016～0.074 mg/L、10.1～31.9 mg/m3。[结论]生态砾石床适用于低污染水体的治理,对荔枝湖湖水的各种污染物有着稳定的去除率(总氮除外)。

[Objective] The research aimed to analyze removal efficiencies of the ecology gravel bed on each pollutant of the water body from Lizhi Lake.[Method] Water body from Lizhi Lake in Shenzhen City was test water.CODCr,TN,NH3-N,TP and Chl-a were analytical indices of the water quality.Removal efficiencies of the ecology gravel bed on each pollutant of the water body from Lizhi Lake were studied.[Result] When CODCr of the test water was 16.7-30.7 mg/L,TN was 0.78-1.55 mg/L,NH3-N was 0.10-0.70 mg/L,TP was 0.057-0.120 mg/L,and Chl-a was 15.7-47.7 mg/m3,average removal efficiencies of the ecology gravel bed on each pollutant were respectively 36.8%,5.3%,80.0%,52.4% and 37.7%.Their effluent concentrations were 10.2-21.1 mg/L,0.77-1.52 mg/L,0.04 mg/L,0.016-0.074 mg/L,10.1-31.9 mg/m3.[Conclusion] Ecology gravel bed was suitable for treatment of the low-pollution water body.Except for TN,ecology gravel bed had stable removal efficiency on each pollutant.