两种分段进水工艺脱氮除磷性能对比

以实际城市生活污水为处理对象,调整A/O分段进水工艺结构和运行参数,对比研究了系统去碳、脱氮、除磷性能,着重分析了改进后工艺(改良UCT分段进水工艺)的脱氮除磷机理.结果表明,改良UCT分段进水工艺在进水分配比40%:30%:30%,污泥龄8~9d,内循环和污泥循环比75%,厌氧区、缺氧区、好氧区的体积比1∶3∶6的运行条件下,可以同时获得碳、总氮、总磷的高效去除,去除率分别为(83.9±3.3)%、(83.5±1.4)%和(86.6±2.4)%,对比A/O分段进水工艺脱氮除磷性能得到了显著的提升.

Comparisons of Nutrients Removal Performance Between Two Types of Step Feed Processes From Municipal Wastewater

The anoxic/oxic(A/O) step feed process unit and operation parameters were adjusted to increase organics and nutrient removal by reconfiguring the process into a modified University of Cape town(UCT) step feed process treating municipal wastewater.The nutrients removal mechanisms in the modified UCT step feed process were discussed in detail.Results showed that the simultaneously highest removal efficiencies of chemical oxygen demanding(COD) of(83.9±3.3)%,total nitrogen(TN) of(83.5±1.4)% and phosphorus of(86.6±2.4)% were obtained in the modified UCT step feed process with the optimum operation parameters,which were the influent distribution ratio of 40%∶30%∶30%,the sludge retention time of 8~9 d,both the internal recycle ratio and the sludge recycle ratio of 75%,and the ratio of anaerobic/anoxic/oxic volumes of 1∶3∶6.In comparison with A/O step feed process,nitrogen and phosphorus removal performance was remarkablely improved.