坡岸截留强化处理设施在不同运行条件下对农业面源污染物去除效果

对坡岸截留强化处理设施在不同温度、不同雨强、不同降雨间隔条件下处理农业面源污染进行中试试验研究.结果表明,水温从20℃下降至4.3℃,COD、TN、NH+4-N、TP去除率下降了15.58%、48.93%、42.26%、57.75%;降雨强度由0.65mm·min-1增加1倍至1.30 mm·min-1,COD的平均去除率低了15.19%,TN、NH+4-N的去除效率相当,TP的去除效率提高了11.21%,但COD、TN、NH+4-N、TP单位面积去除的总量却提高了26.27%、68.3%、32.6%、104.2%;降雨间隔从2 d增加到4 d时对COD去除的影响不大,但使NH+4-N、TN的处理效率提高19.31%、13.95%,对TP的单位面积去除量提高71.43%,但去除总量有限.

Agricultural Non-Point Source Pollutants Removal by Enhanced Riverbank Interception Facilities Under Different Operating Conditions

Treatment of agricultural non-point source pollution in a pilot scale by enhanced riverbank interception facilities with different temperatures, rainfall intensities and rainfall interval conditions was investigated. The results showed that if water temperature decreased from 20 degrees to 4.3 degrees, the removal efficiencies of COD, TN, NH₄⁺-N, TP decreased by 15.58%, 48.93%, 42.26%, 57.75% respectively, and no significant effect on the removal of SS was found. If rainfall intensity increased doubled from 0.65mm ·min^-1 to 1.30mm ·min^-1, it made the average removal rate of COD decrease 15.19%, TN, NH₄⁺-N did not change and removal efficiency of TP increased 11.21%. But the total removed quantity per unit area of COD, TN, NH₄⁺-N, TP increased by 26.27%, 68.3%, 32.6%, and 104.2%. If rainfall interval increased from 2 to 4 days, it would make NH₄⁺-N, TN removal efficiencies increase by 19.31%, 13.95% respectively, and the removed quantity per unit area of TP increased 71.43%, but the total removal quantity of TP was limited.