复合床生态滤池处理城市污水中试研究

Pilot test on multiple layer microbial-earthworm eco-filter system for sewage treatment

复合床生态滤池(MMEEF)是利用由微生物和蚯蚓为代表的微型动物共同组成的人工生态系统,是对城镇污水中的污染物进行降解处理的新型污水处理技术.滤床由植物性填料层和惰性填料层组成.复合床生态滤池处理初沉池出水,水力负荷为2 0m3·m-2·d-1,出水SS小于5mg·L-1,CODCr去除率为74%～87%,NH+4 N去除率为30%～50%,TN去除率为25%～40%,TP去除率为40%～57%.水力负荷降低,NH+4 N去除率和硝酸根浓度的增加量4 N去除率增加,硝酸根浓度增加,NH+与碱度减少量成正相关.惰性颗粒层在硝化方面起着主要作用,蚯蚓对生态滤池的正常运行有重要作用.

Multiple Layer Microbial-Earthworm Eco-filter System (MMEEF) with combination of microbe and earthworm is a representative of micro-fauna to form artificial ecosystem and is a new wastewater treatment technique to degrade pollutants for sewage treatment. The filter bed is composed of material deprived plant and inert particle material. In this study, at the hydraulic load rate (HLR) of 2.0?m^3·m^(-2)·d^(-1), the system can remove 74%～87% of chemical oxygen demand (COD_(Cr)), 30%～57% of ammonium nitrogen (NH^+_4-N), 25%～40% of total nitrogen (TN) and 40%