SBR法去除有机物、硝化和反硝化过程中pH变化规律

LAW OF CHANGES IN pH DURING PROCESSES OF NITRIFICATION,DENITRIFICATION AND ORGANISM REMOVAL BY SBR

为实现SBR法脱氮在线模糊控制 ,以啤酒废水为研究对象 ,通过不同进水氨氮浓度和不同进水有机物浓度的试验 ,研究了SBR法去除有机物、硝化和反硝化过程中pH的变化规律。试验结果表明在有机物去除过程中pH呈现大幅上升的现象 ;有机物去除结束时pH停止上升 ,随着硝化反应的进行pH不断下降直至反应结束 ,然后pH突然快速上升或维持不变。在反硝化过程中 ,pH不断上升直至反硝化结束出现转折点 ,然后持续下降 ,指示反硝化已经结束。不同进水氨氮浓度和进水有机物浓度的试验进一步验证了pH特征点的重现性 ,可以作为SBR法去除有机物。

In order to achieve fuzzy control of denitrification in Sequencing Batch Reactor(SBR)beer wastewater was treated.Through nitrogen shock loading and organic shock loading experimentations we have studied the relationship between pH and organic matter degradation,nitrification and denitrification.During the degradation of organic matter,pH increases quickly.During nitrification pH decreases.When ammonia stops degrading,pH increases quickly or then maintains the same value.During denitrification,pH increases till denitrification stops,then decreases,showing a turning point.Nitrogen shock loading and organic shock loading experimentations and the derivative curve verify the reproducibility of pH characterishic points and could be used as process control parameters.