较高负荷条件下活性污泥-生物膜联合系统对氮磷的去除

中试试验条件下,考察了较高的有机负荷对活性污泥-悬浮载体生物膜联合系统对氮磷去除效果的影响。试验表明,水温为20~33℃时,在联合系统污泥龄为4~9d,有机负荷达到0.18~0.55kg/kg.d条件下,对磷的去除效果稳定在90%左右,氨氮的去除率达到80%以上,出水总氮平均为11mg/L,达到《城镇污水处理厂污染物排放标准》(GB18918-2002)中一级排放标准。同时,试验过程中也发现了联合系统的好氧池中存在明显的同步硝化反硝化现象,并初步分析了其原因与影响因素。

INFLUENCE OF HIGH ORGANIC LOAD ON NITROGEN AND PHOSPHORUS REMOVAL IN A ACTIVATED SLUDGE-BIOFILM COMBINED SYSTEM

The influence of high organic load on nitrogen and phosphorus removal by activated sludge-biofilm combined system was studied in a pilot-scale reactor.Sludge retention time of the combined system was controlled between 4～9 d,temperature was 20～33℃, and organic load of the system was between 0.18～0.55 kg BOD_5/kg MLSS.d in the half-year study. Efficient nutrient removal was achieved,TP removal rate could be up to 90%,and NH_3-N removal rate could be more than 80%,the effluent TN was about 11 mg/L in average.At the same time, simultaneous nitrification and denitrification was observed in aerobic tanks,the cause and influence factors were analyzed.