双系统曝气生物滤池处理玉米青贮渗出液

采用双系统改性沸石曝气生物滤池(BAF)反应器对玉米青贮渗出液进行除碳脱氮处理,研究了对COD、氨氮、总氮(TN)的去除效果及其影响因素气水比(流量比)、水力停留时间、有机负荷和回流比。结果表明:挂膜成熟后,沸石生物膜反应器对COD和氨氮有较好的去除效果;挂膜23 d后,COD的去除率可以稳定在70%,氨氮去除率可以稳定在80%以上;当气水比为2∶1,水力停留时间为12 h,生物膜活性达到最高,COD去除率达到83.4%;有机负荷对氨氮去除效果影响较大,有机物质量浓度从160 mg/L提高到280 mg/L时,NH4+-N的去除率由88.6%降为32.7%;回流比对COD、氨氮去除率影响不大,但对TN的去除影响显著,回流比从50%提高到300%,TN去除率从42.3%上升到81.3%。双系统改性沸石BAF反应器明显地改善了玉米青贮渗出液的出水水质。

Treatment of corn silage effluent by using double zeolite-biological aerated filter system

Double modified zeolite-biological aerated filter(BAF) system was selected to treat the corn silage effluent for the removal of COD,NH+4-N and total nitrogen(TN).Removal efficiency and effecting factors such as the flow ratio of gas to water,hydraulic retention time(HRT),organic load and reflux ratio were investigated.The results show that after the biofilm maturation the bio-zeolite system BAF has obvious and stable removal of COD and NH+4-N;the removal efficiency of COD and NH+4-N is over 70% and 80% respectively after 23 d.When the flow ratio of gas to water is 2 ∶1,HRT is 12 h,the biofilm has the best activation,and the removal efficiency of COD is 83.4%.Increasing the organic load,the removal of NH+4-N is severely inhibited,which can be reduced from 88.6% to 32.7% when the organic mass concentration increases from 160 mg/L to 280 mg/L.The removal of TN is influenced significantly by reflux ratio,by which the removal efficiency increases from 42.3% to 81.3% when the reflux ratio is raised from 50% to 300%.But it is not significant for COD and NH+4-N.The effluent quality of corn silage effluent is obviously improved through the double zeolite-BAF system.