基于生物膜反应器的作物青贮液处理研究

Research on treatment of the plant silage effluent based on membrane reactor

作物青贮渗出液属于高CODCr、高氨氮废水，对水环境质量影响不容忽视．采用沸石生物膜的方法处理奶牛养殖场玉米青贮渗出液，研究了对CODCr氨氮的去除效果．结果表明，挂膜23d后，CODCr的去除率可以稳定在70％，氨氮去除率可以稳定在80％以上，挂膜成熟后沸石生物膜反应器对CODCr和氨氮有较好的去除效果；当气水比为2：1，水力停留时间为12h，生物膜活性达到最高，有机污染物的去除效果最好；当CODCr的质量浓度达到280mg／L时，氨氮的去除率降为32．79／6，显示出有机污染物的降解好氧严重抑制了硝化细菌的生长，有机负荷对氨氮去除效果影响较大．

In plant silage effluent, CODcr and NH4 ＋-N are in high concentration, which has caused seri- ously envircmental pollution. Bio-zeolite system, removal of CODcr and NH4＋-N, was selected to treat the corn silage effluent in dairy farm. The following results are obtained, after the 23th day from bicfilm formatial , the removal efficiency of CODer and NH4＋ - N are over 70% and 80% respectively , whichreveals the stable for the removal of CODcr and NH4 ＋-N by bio-zeolite system after the biofilm matura- tion. When the gas to liquid ratio is 2 ： 1, hydraulic retention time is 12 h, the biofilm has the best of acti- vation and the highest removal rate of organic pollutant. The removal rate of NH4＋- N decreases to 32. 7% when the concentration of CODcr increases to 280 mg/L. The removal of NH4＋-N is limited by or- ganic load and the decrease of DO concentration, organic degradation, severely inhibites the growth of ni- trifying bacteria.