漂浮植物塘处理农村分散生活污水的应用

通过现场实验评价了漂浮植物塘配合化粪池处理农村分散生活污水的效果。实验结果表明,漂浮植物有效地抑制了污染水体中藻类的生长;在平均水力停留时间为36 d,COD、TN、TP平均污染负荷分别为3.1、0.86和0.056 g/(m2.d)的条件下,大薸塘对COD、TN、TP的平均去除率分别为68.5%、89.9%和85.2%,出水COD、TN和TP平均浓度分别为47、4.15和0.40 mg/L,达到GB18918-2002中的一级A标准。在水乡地区利用漂浮植物与农村宅河构造漂浮植物处理系统,是一种深度处理化粪池出水、控制农村生活污水对河道造成污染的有效措施。

Application of floating aquatic macrophytes system for treatment of rural domestic wastewater

Field experiment was conducted to investigate the performance of the process combining floating aquatic macrophytes treatment system with septic tanks for treating rural domestic wastewater. The results indicate that floating aquatic plants can inhibit the growth of algae effectively. Average removal rates of COD, TN and TP in the pond stocked with water lettuce were 68.5%, 89.9% and 85.2%, respectively when HRT was 36 d and average loading rates of COD, TN and TP were 3.1, 0.86 and 0.056 g/(m²·d), respectively. Concentrations of COD, TN and TP in the effluent were 47 mg/L, 4.15 mg/L and 0.40 mg/L, respectively, meeting the standard of level A stipulated by Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant(GB18918-2002). The process which combines floating aquatic macrophytes treatment system with septic tanks can effectively improve the quality of river water which has been severely polluted by rural domestic wastewater.