低P/COD进水对同步硝化反硝化的影响

摘要

针对化学强化一级处理出水的水质,主要研究了不同低磷含量进水对氮素等营养物去除的影响.在序批式活性污泥反应器(SBR)内,进水总磷和化学需氧量(P/COD)之比分别控制在1/500、1/250和1/156.结果表明,运行结束时三个P/COD比系统内的总磷含量均低于检测水平,表明三种低磷含量的进水对于总磷的去除影响不大.而总氮的去除率随着磷含量的增加从42.74％升高至79.60％,同时硝化和反硝化反应速率达到平衡,有效地实现了同步硝化反硝化过程.其中,在P/COD比1/156的进水系统内,氨氮和总氮的去除率最高,分别达到85.91％和79.60％.这些结果表明,氮的去除效率受到了磷含量的影响,并且氮的损失主要是基于同步硝化反硝化的方式.%The main objective was to study the influences of low phosphorus levels on nitrogen and other nutrients removal.The experiments were performed by controlling the influent total phosphorus and chemical oxygen demand ratios (P/COD) of 1/500、1/250 and 1/156.Results showed that the phosphorus concentrations were lower than the analytical method detection limits at the end of the cycle period,indicating phosphorus removal was irrespective of P/COD ratios.The total nitrogen (TN) removal efficiencies fluctuated from 42.74％ to 79.6％ with increasing phosphorus contents.Furthermore,the nitrification and denitrification rates reached equilibrium,resulting in efficient simultaneous nitrification and denitrification (SND).Among them,the P/COD ratio of 1/156 in the influent system,ammonia nitrogen (NH3-N) and TN removal rate was the highest,reaching 85.91％ and 79.60％.The experimental results indicated that the removal efficiency of nitrogen was affected by phosphorus content,and the loss of nitrogen was mainly based on the method of SND.