影响UASB厌氧氨氧化反应器脱氮性能的因素研究

摘要

目的 研究溶解氧(DO)、温度、pH值和水力停留时间(HRT)对UASB厌氧氨氧化反应器脱氮性能的影响,寻找快速有效的脱氮处理途径.方法 试验进水以人工配水的方式模拟城市生活污水,分别考察UASB反应器在不同的DO、温度、pH值和HRT反应条件下,通过检测进、出水中NH4-N、NO2--N与NO3--N的质量浓度,分析UASB厌氧氨氧化反应器的脱氮性能,并确定最优环境因素.结果 在进水中NH4+-N和NO2--N质量浓度分别为50 mg/L和66 mg/L、p (DO)＜1 mg/L、温度为30～ 35℃、pH =7 ～8、HRT=12 h的反应条件下,该反应器中的菌种具有最大的生物活性,污水的脱氮效果最优,总氮(TN)去除率维持在80％以上.结论 厌氧氨氧化反应最佳条件的确定,为厌氧氨氧化工艺脱氮性能稳定性的控制起到关键作用.%The purpose of this paper was to investigate the effects of DO,temperature,pH and HRT on the nitrogen removal performance of anammox UASB reactor,to find a fast and effective way for nitrogen removal.Artificial synthetic wastewater was used to simulate urban sewage as influent water of test.The nitrogen removal performance of UASB reactor was investigated to determine the optimal environmental factors under the different DO,T,pH and HRT conditions,by detecting the concentration of the inlet and outlet of NH4+-N,NO2--N and NO3--N.The results showed that when the concentration of NH4+-N and NO2--N is 50 mg· L-1 and 66 mg· L-1,ρ (DO) ＜ 1 mg·L-1,T =30 ～35 C,pH =7 ～8,HRT =12 h,the bacteria in the reactor had the highest bio logical activity,the nitrogen removal efficiency was the best,and the TN removal rate was above 80％.Therefore,the optimum conditions of anammox reaction,is the key role to control the stability of nitrogen removal performance.