低基质浓度下pH和DO对厌氧氨氧化反应效能的影响

EFFECT OF pH AND DO ON ANAMMOX REACTION PERFORMANCE UNDER LOWER POLLUTANTS CONCENTRATION

在实验室稳定运行的ASBR反应器基础上,以人工模拟废水为原水,分别研究了p H值、DO对厌氧氨氧化反应器脱氮性能的影响,旨在找出厌氧氨氧化反应最佳的p H值范围,并考察过高的进水DO对厌氧氨氧化污泥脱氮效能的影响及厌氧氨氧化污泥对高浓度DO的抵抗性。结果表明:厌氧氨氧化反应器的最适进水p H为7.5~8.0,此范围内反应器脱氮性能良好且稳定,NH+4-N去除率达到90.2%,NO-2-N去除率达到91.1%。而厌氧氨氧化菌对DO十分敏感,水体中含氧量过高会产生明显的抑制作用,但控制进水溶解氧浓度后,厌氧氨氧化反应器脱氮性能可迅速恢复。一定时间内高浓度DO对厌氧氨氧化污泥的活性抑制是可以恢复的。

In order to find out the optimum range of p H value for anammox reaction,simulated wastewater was used to study the effect of different p H,DO concentration on the performance of anammox reactor for Nitrogen removal in an ASBR reactor.And it is investigated that the effect of higher DO concentration on the performance of anaerobic ammonia oxidation sludge for nitrogen removal and the resistance capacity of anammox sludge against high DO concentration. The result shows that the optimum range of p H value for anaerobic ammonia oxidation reactor is 7. 5 ~ 8. 0,and its nitrogen removal performance is good and stable within this range: the removal rate of NH+4- N reached 90. 2%,and the NO-2- N removal rate reached 91. 1%.And anammox bacteria are very sensitive to oxygen content. There is significant inhibition effect when the DO in water is too high,but anaerobic ammonia oxidation reactor nitrogen removal efficiency can rapidly recovered when DO concentration being under control.