MBR工艺处理高盐度废水试验

采用MBR工艺对高盐度废水处理的影响因素进行研究。试验条件如下:污水中海水比例为50%,COD为700~800 mg/L,氨氮为80~100 mg/L,HRT为12 h,污泥浓度为7~8 g/L。试验结果表明:在高盐度条件下,采用低溶解氧(DO为1~2 mg/L),COD和氨氮的平均去除率可分别达到91.91%和91.44%;但氨氮负荷提高到0.4 kg/(m3.d)左右时,其平均去除率仅为62.47%。通过降低DO浓度和提高进水氨氮浓度可以使亚硝化率达到50%以上,但不能保持稳定的亚硝酸盐积累。

EXPERIMENT ON THE TREATMENT OF WASTEWATER CONTAINING HIGH SALT BY MBR PROCESS

The experimental study is about the influence factor of the treatment of wastewater containing high salt by MBR process. The test conditions are as below: wastewater containing 50% seawater, COD was 700～800 mg/L, NH_3-N was 80～100 mg/L, HRT was 12 h, MLSS was 7～8 g/L. The result showed that the average removal efficiency of COD and NH_3-N was 91.91% and 91.44% respectively when the DO was 1～2 mg/L in the salty condition. But when the loading of NH_3-N was increased to 0.4 kg/(m~3-d) , the average removal efficiency of ammonia was just 62.47 % . The rate of nitrosation could exceed 50 % by reducing the concentration of DO and increasing the NH_3-N concentration of the influent, but this way could not keep a steady rate of nitrite accumulation.