曝气气水比对人工湿地处理效果的影响

INFLUENCE OF AERATING GAS-WATER RATIO ON TREATING EFFECT OF CONSTRUCTED WETLAND

从溶解氧角度出发,考察了曝气气水比对人工湿地处理效果的影响。选取气水比为0、2、4、6、8、10、12七种工艺参数进行试验。结果表明,曝气可明显改善整个湿地的溶解氧水平及湿地的处理效果,尤其是脱氮效果。在气水比为6时,人工湿地各污染物的去除率达到最大,COD去除率为85.6%,TP去除率为70.9%,TN去除率为83.1%,NH3-N去除率为84.2%,出水NO3--N浓度最低,为6.32 mg/L。

The influence of different aerating gas-water ratio on treating effect of constructed wetland was discussed from dissolved oxygen.Seven kinds of gas-water ratios,0,2,4,6,8,10 and 12,were selected for test operation condition.The result showed that aeration could make the level of DO and treating effect improve obviously,especially the removal rate of TN.Treating effect of wetlands was best when gas-water ratio was 6,and removal rate of COD,TP,TN and NH_3-N was respectively up to 85.6%,70.9%,83.1% and 84.2%,the concentration of NO^-_3-N of the effluent was the lowest(6.32 mg/L).