SBR法短程硝化及过程控制研究

考察了采用SBR法处理氨氮浓度较高的化工废水时供氧方式对硝化过程中DO、ORP和pH值变化规律的影响。试验结果表明，在曝气量恒定的条件下，可以硝化过程中DO和pH值升高速率的不同表征反应的进程程序，即当氨氮浓度接近零时，DO和pH值升高速率或变化幅度加大，二者可以作为SBR硝化反应时间的控制参数，而ORP值对SBR硝化反应结束的批示作用不是很明显；在DO量恒定的情况下，pH值在整个硝化反应过程中都是缓慢下降或趋于稳定的，当硝化反应结束时突然升高，因此pH值也可作为SBR硝化反应时间较好的控制参数，而ORP值在硝化反应的初期快速升高，之后升高的速度越来越慢直至趋于平稳，它对SBR硝化反应结束的指标作用同样不是很明显。

Study on Short-cut Nitrification by Using SBR Process and Its Process Control

In the use of SBR process for treatment of chemical wastewater with high NH-3-N concentration, investigation was made for the effect of oxygen supply on DO, ORP and pH variation in nitrification process. The result showed that under the fixed aeration rate, different rising rate of DO and pH may be used to express the progress of nitrification, that is, when NH-3-N concentration approaches zero, the increase occurs in the rising rate and variation range of DO and pH, the both can be used as parameters for controlling nitrification time, and ORP gives no obvious indication of the ending of nitrification. Under the fixed DO, pH drops slowly or tends to be stable in whole course of nitrification, and abruptly rises in the ending of nitrification. Therefore, pH is also a desired controlling parameter in SBR nitrification; while OPR rises rapidly in the initial stage of nitrification, and then it rises at slower and slower speed until it approaches to stability, it also does not indicate distinctly the finishing of SBR uitrification.