生物膜-人工湿地组合工艺处理城镇生活污水的研究

Studies on Municipal Wastewater Treatment with A Combination System of Biofilm Reactor and Constructed Wetland

采用以天然植物中空纤维作为填料的生物质-生物膜反应器(BBFR)串联复合垂直流人工湿地(IVCW)的组合工艺处理系统,研究了5种不同的运行工况,即不同的停留时间、水力及污染负荷条件下对城镇生活污水的处理效果。结果表明,5种工况下组合系统的出水均能达到一级排放标准,COD、TN和TP的平均去除率分别达到89.86%、93.5%和74.78%。各工况条件下因为装置控制参数和稳定程度的不同,各运行阶段下的净化效果也有一定的差异。通过探讨BBFR和IVCW的最佳耦合模式,即系统处理效果达到最佳时的运行参数,实现了BBFR和IVCW二者间的优势互补。

The purification efficiency of a combination system, consisted of biofilm reactor and constructed wetland to treat municipal wastewater was studied. The biofilm reactor was filled with hollow fibre of natural plants. The system was operated under different running status, which was different combinations of hydraulic retention time, volume and pollutant loading. The results showed that the wastewater after treated under all the status could meet rank 1 of the integrated wastewater discharge standard of China, and the removal efficiency for COD, TN and TP were 89.86%, 93.5% and 74.78%, respectively. Because of the various combinations and the stability of the system, the treatment efficiency among the different status was somewhat different.This paper also explored more reasonable model for the combination system of biofilm reactor-constructed wetland that was the proper selection of running parameters, under which the highest treatment efficiency could be reached. Finally, the biofilm reactor and constructed wetland could fit each other well.