利用ORP和pH控制豆制品废水的处理过程

研究ORP和pH在豆制品废水处理过程中的变化与有机物和氨氮的去除间的内在关系，有利于实现SBR法处理废水的在线控制．以豆制品废水为研究对象进行不同进水有机物和污泥质量浓度的试验，结果显示，在有机物降解过程中，0RP出现两个特征点：第1个为ORP凹点，表示反应器内大部分有机物已被去除；第2个为0RP平台，表示有机物已基本不再降解；pH存在两个变化区域：在反应初期为波动区，当有机物降解接近结束时，pH上升速度明显减慢，最后出现平台区．不同进水有机物和初始污泥质量浓度对反应过程的特征点并没有影响，因此可应用ORP和pH作为SBR法去除有机物的模糊控制参数．

Using ORP and pH value to control treatment of soybean wastewater

It is significant to study control parameters in wastewater treatment. The conditions for removal of COD and NH 3-N can be known indirectly using the control parameters. A sequencing Batch Reactor (SBR) was operated to dispose soybean wastewater. In order to achieve reliable control parameters, the change of oxidation reduction potential (ORP) and pH in treatment process was researched. As a result, two distinct inflection points were observed in the change curve of ORP throughout each SBR processing cycle. The first inflection point was ORP concave value, it expresses that a majority of COD has been removed. The second inflection point was ORP flat roof; it shows the end of treatment process. There are two regions in the change curve of pH. The first region was at the beginning of treatment, the change of pH was acute in this region. The second region was at the end of treatment,the change of pH was calm in this region. These inflection points ware not influenced by different inflow organic loadings and MLSS concentration. So, on line fuzzy control of organic pollutant removal can be achieved by applying ORP and pH.