一体式厌氧氨氧化工艺处理高氨氮污泥消化液的启动

利用新型固定生物膜一活性污泥反应器处理实际污泥消化液,通过接种短程硝化污泥和厌氧氨氧化生物膜填料,逐渐提高进水氨氮浓度并控制溶解氧浓度在0.11~0.42mg/L,系统在65d内实现了短程硝化-厌氧氨氧化反应的启动.反应器系统稳定运行阶段具有良好的污染物去除效果,进水COD和氨氮浓度为921和1120.8mg/L,COD、氨氮和总氮去除率分别为66.8%,99.0%和94.4%,总氮去除负荷为0.27kg N/(m3·d).试验表明采取逐步提高进水中消化液比例的策略,有利于一体式厌氧氨氧化工艺的快速启动.进一步分析发现系统同时存在厌氧氨氧化和反硝化的脱氮途径,对总氮去除的贡献率分别为67.4%~91.1%和8.9%~32.6%.

Start-up of one-stage partial nitrification/anammox process treating ammonium-rich reject water

Partial nitrification/anammox (PN/A) process has become one of the most innovative developments in reject water treatment in recent years. In this study, a one-stage integrated fixed-film activated sludge reactor was used to treat reject water. By inoculating partial nitrification floc sludge and anammox biofilm, gradually increasing ammonium concentration of influent and controlling DO at 0.11~0.42mg/L, the reactor was started successfully in 65days. In the stable phage, the system had a good contaminant removal performance. With influent concentration of COD and ammonium were 921mg/L and 1120.8mg/L respectively, 66.8% COD, 99.0% ammonia and 94.4% total nitrogen were removed respectively and total nitrogen removal rate reached 0.27kgN/(m3·d). The experiment showed that the start-up of PN/A process was promoted by increasing the ratio of reject water in influent gradually. Further analysis revealed that both anammox and denitrification process were present in system. The contributions to total nitrogen removal of anammox and denitrification were 67.4%~91.1% and 8.9%~32.6%, respectively.