改良SBR工艺实现生活污水除磷与半亚硝化

常温条件下(20~25℃),采用序批式反应器(SBR),应用改进后的运行策略:进水、厌氧搅拌、曝气搅拌、静置沉淀、排水、选择性排泥、污泥床缺氧搅拌,控制污泥龄为20d,溶解氧为0.2~0.5mg/L,实现单污泥系统同步除磷亚硝化的稳定运行.结果表明:总磷去除率为95.9%~97.1%,出水总磷浓度为0.1~0.4mg/L,好氧阶段氨氮去除容积负荷为0.242kg N/(m3·d),出水氨氮和亚硝酸盐氮的比值约为1:1,可以为后续的厌氧氨氧化提供合适的进水.

Partial nitritation and phosphorus removal in improved SBR process treating domestic wastewater

The stable operation of dephosphorization-nitrosation was realized by a sequencing batch reactor (SBR) with improved operating strategy at normal temperature (20~25℃). The operating strategy include water loading, anaerobic mixing, aeration mixing, settling, drainage, selective sludge discharging and sludge bed anoxic mixing. In addition, the sludge age was 20d and the dissolved oxygen was 0.2~0.5mg/L. The results showed that the TP removal rate was 95.9%~97.1% and the volumetric load of ammonium removal during aeration phase was 0.242kg N/ (m3×d).The effluent of dephosphorization-nitrosation with the TP was 0.1~0.4mg/L and the ratio of ammonia nitrogen and nitrite nitrogen was about 1:1, which was appropriate for the influent of anaerobic ammonium oxidation process.