as for the second biological contact oxidation pond, the optimal HRT and air/water ration were 2.64h(its ALR 0.78 kg/m3d) and 6 respectfully, the nitrifying effect was better as effluent D0=5~6mg/l.

• 对于进行硝化处理的二级生物接触氧化池的坂让l一、瓦工为:.；川:(对应共氦抓如衍为0