as for the first biological contact oxidation pond, the optimal HRT was 4h(its OLR_(COD) was 3.6~4.1kg/m3d, OLR_(BOD) was 1.62-1.85kg/m3-d), the effect was better when its air/water ration#6 and effluent D0=4.5-6mg/l;

• 对于主要去除碳化有机物的一级生物接触氧化池的最佳HRT为4h(对应其COD容积负荷为 3.；6一4