SBR法短程硝化及过程控制研究

考察采用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溶解氧(DO)质量浓度、氧化还原电位(ORP)和pH变化规律的影响。试验结果表明,在曝气流量恒定的条件下,可以硝化过程中DO质量浓度和pH升高速率的不同表征反应的进行程度,即当氨氮浓度接近零时,DO质量浓度和pH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在DO质量浓度恒定的情况下,pH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也可作为SBR硝化反应时间较好的控制参数。

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 NH3-N concentration,investigation was made for the effect of oxygen supply on Dissolved Oxygen(DO),mass Concentration,Oxidation-Reduction Potential(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 NH3-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 fixedDO,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.