SBR法反硝化模糊控制参数pH和ORP的变化规律

为实现SBR法处理啤酒废水反硝化的在线模糊控制,研究了啤酒原水及其不同投加量、不同投加方式以及乙酸钠、甲醇和内源呼吸碳源对反硝化过程中pH和ORP变化规律的影响.结果表明,pH不断上升直至反硝化结束转而持续下降;ORP则减速下降,在反硝化结束时突然下降速度增加出现拐点.不论使用何种碳源以及不论投加碳源的方式和数量如何都证明在反硝化结束时pH和ORP有特征点出现,通过pH上升的速度的差别可以判断碳源是否充足,调控碳源的投加.

Characters of Fuzzy Control Parameters pH and ORP of Denitrification in SBR Process

In order to achieve fuzzy control of denitrification in Sequencing Batch Reactor,the effects of beer wastewater, sodium acetate, methanol and endogenous carbon source on the relationships between pH,ORP and denitrification were studied. Different amount of beer wastewater and two different methods of dose were examined. All the results indicated that ORP decreased quickly and then slowly, when denitrification stopped ORP decreased quickly, showing a breakpoint on the ORP curve; pH increased till denitrification stopped, then decreased , showing a turning point. When carbon was the limiting factor, through comparing the increasing rate of pH, whether the carbon was enough or not could be known and when the carbon should be added again could be decided.