沸石-核桃壳曝气生物滤池去除废水中氨氮的研究

采用核桃壳和沸石组合作为曝气生物滤池填料,处理废水中的NH_4~+-N。试验期间,每天定时监测曝气生物滤池进水和出水的pH、溶解氧、COD、NH_4~+-N、亚硝酸盐氮和硝酸盐氮等水质指标。考察了核桃壳-沸石曝气生物滤池的脱氮性能,研究了水力负荷和气水比对曝气生物滤池去除NH_4~+-N效率的影响。此外,研究了曝气生物滤池的沿程特性。试验结果表明,核桃壳和沸石是可取的曝气生物滤池填料,具有较好的硝化能力,能有效地去除污染物。最佳水力负荷为0.04 m/h,最佳气水比为6∶1,在此条件下,NH_4~+-N去除率保持在80%以上。填料层底部向上25~55 cm段为NH_4~+-N去除高效段。

Research on the removal of ammonia nitrogen from wastewater by zeolite and walnut combined fillers of the biological aerated filter

The combination of wal nut shells and zeolite as the fillers of biological aerated filter has been used for removing ammonia nitrogen from wastewater. During the testing,the water quality indicators,such as pH,dissolved oxygen,COD,ammonia nitrogen,nitrite nitrogen,nitrate nitrogen,etc. are monitored regularly every day. The denitri-fication capacity of zeolite and walnut combined fillers of the biological aerated filter is investigated ,and the influences of hydraulic load and gas-water ratio studied. In addition,the characteristics along the process of biological aerated filter are studied,too. The experimental results show that walnut shell and zeolite are advisable fillers of biological aerated filter,which have better nitrification ability,and can remove pollutants effectively. The optimal hydraulic load is 0.04 m/h and the optimum gas-water ratio is 6:1. Under these conditions,the removing rate of NH4+-N maintains at 80%. The highly efficient segment of NH4+-N removal is upward from the bottom of filler layer 25 cm to 55 cm segment.