自生生物动态膜反应器处理低碳氮比污水的研究

Self-forming dynamic membrane bioreactor for treatment of low C/N ratio wastewater

在好氧连续曝气方式下采用自生生物动态膜反应器处理低C／N污水，水力停留时间为5h，膜通量为17～19L／（m^2·h），COD／NH4^＋-N在0．56～2．22，COD去除率在起始阶段达70％左右，运行稳定后，下降到40％左右；NH4^＋-N的去除率一直稳定在60．0％左右。在NH4^＋-N的氧化过程中，NH^4＋-N除被生物利用外，大部分被转化为NOF-N（出水中NO3^-N浓度非常低），亚硝化率平均达到94％。

Under aerobic condition, a self-forming dynamic membrane bioreactor was used for the treatment of septic tank wastewater at HRT=5 h, the membrane flux=17-19 L/（m2 · h） and the COD/NH4^＋-N= 0.56-2.22. The removal efficiency of COD was 70% initially and decreased to 40% later. The NH4^＋-N removal was about 60.0%. A major part of NH4^＋ -N was oxidized to nitrite as evidenced by a low nitrate level in the effluent while the nitrite level increased in the reactor.