高效菌藻塘系统对农村污水中磷的强化去除效果研究

研究了高效菌藻塘系统处理太湖地区农村生活污水除磷效果及其强化措施。高效菌藻塘和水生生物塘HRT分别为8 d和4 d,进水总磷浓度为1.7～17.1 mg/L,出水总磷浓度全年平均值为3.33 mg/L,高效菌藻塘系统的除磷能力欠佳。通过降低水生生物塘内水深、采用废弃石膏作为填料构建了新型复合水生生物塘,HRT=1.6 d条件下,复合水生生物塘出水总磷可保持在1 mg/L以下,可达到GB18918-2002一级B排放标准。

Enhancement of phosphorus removal from rural domestic wastewater with HRAP

Enhancement of nutrient removal from domestic wastewater was studied in a high-rate algal pond system ( HRAP ) in rural area of Taihu. At HRT of 8 days and 4 days for algal pond and hydrophyte pond respec-tively,when influent phosphorus fluctuated from 1.7 to 17. 1 mg/L,the annual average of effluent phosphorus was 3.33 mg/L. Aimed at unsatisfactory phosphorus removal in HRAP system,enhancement strategies were pro-posed,such as lowering the water depth in hydrophyte pond and using waste gypsum as planting medium to con-struct complex hydrophyte pond. After the modification,the HRT of hydrophyte pond was reduced to 1.6 day while total phosphorus in the treated effluent was maintained below 1 mg/L,which met the first class of national wastewater discharge limit ( GB18918-2002 ).