ABR-生物滴滤池组合工艺处理农村生活污水

采用ABR-生物滴滤池组合工艺,研究在水力停留时间为3 d、滴滤池水力负荷为5 m3/（m2·d）的条件下,组合工艺对生活污水中主要污染物的去除效果、滴滤池内部污染物浓度变化和微生物的沿程分布规律。实验结果表明,组合工艺对COD、TN、NH＋4-N和TP的平均去除率分别可达73%、32%、58%和30%;滴滤池内各层污染物浓度除TP在中层略有升高外,其余均沿程逐渐降低。滴滤池底层对各种污染物的去除能力均较强,原因是果壳活性炭填料较强的截留吸附能力以及底层微生物优势菌属较好的降解作用。总氮的去除依靠滴滤池内填料的物理化学作用和微生物同步硝化反硝化作用,其中微生物作用约占60%,成为脱氮的主要途径。

Combined process of ABR-Bio-trickling filter for treatment of rural domestic sewage

The combined process of ABR-bio-trickling filter was used to treat the rural domestic sewage,with the study focusing on the contaminant removal efficiency,the concentration variation rules and microbial distribution with distance under the conditions of hydraulic retention time of 3 d and hydraulic loading of 5 m3/（m2 ·d）.The results showed that the average removal efficiencies of COD,TN,NH＋ 4-N and TP were 73%,32%,58% and 30%,respectively;TP concentration in the middle layer of trickling filter increased slightly while the other pollutants concentration decreased along layers.The bottom of trickling filter had strong decontamination ability on various pollutants,mainly because of strong absorbing ability of the nutshell activated carbon filler and degradating ability of the microbial dominant species.The removal of TN relied on the physical and chemical effects of filter and nitrification and de-nitrification effects of microbial,and the contribution rate of the latter was about 60%,so it became the main way of nitrogen removal.