水平流生物膜反应器处理村镇污水的运行特性

Performance of Horizontal Flow Biofilm Reactor for Treatment of Decentralized Rural Sewage

分别采用聚乙烯平板和无纺布负载平板作为水平流生物膜反应器(HFBR)的载体,考察了不同载体对HFBR除污效果的影响。中试结果表明,采用聚乙烯平板和无纺布负载平板作为HFBR的载体时对COD和氨氮均有较好的去除效果。但聚乙烯平板上的生物量相对较低,与无纺布负载平板相比,处理同样污水所需的载体平板数较多。当进水COD为150 mg/L、氨氮为22mg/L时,以无纺布负载平板作为生物膜载体的HFBR对COD和氨氮的去除率分别为85.0%和99.5%。通过测定污染物浓度的沿程变化及对主要功能微生物的荧光原位杂交分析可知,污染物的浓度随着流程而逐层下降,主要功能菌群所占比例随着对应基质浓度的改变而相应变化。

Polyethylene sheets and non-woven fabric sheets were used respectively as biofilm carriers in two pilot-scale structurally identical horizontal flow biofilm reactors （HFBRs） to investigate their pollutant removal performance. The experimental results indicated that both HFBRs with polyethylene sheets and non-woven fabric sheets were effective in removal of COD and ammonia nitrogen. However, biomass on polyethylene sheets was relatively low, which indicated that more polyethylene sheets than non-woven fabric sheets were needed when the same wastewater was treated in HFBR. When using nonwoven fabric sheets as biofilm carrier in HFBR to treat wastewater with 150 mg/L COD and 22 mg/L ammonia nitrogen, the removal rates of COD and ammonia nitrogen were 85.0% and 99.5% , respectively. Fluorescent in situ hybridization （FISH） and image analysis suggested that both the pollutant concentra- tion and the percentage of main functional microbial populations in biofilms changed with the concentra- tion of pollutants gradually along the flow.