Through continuous monitoring of the parameters, such as DO, pH,ORP and water quality, of every reaction tank at various stages of the first half cycle of the operation of the CMICAO technology ( commutative multi-influent cascade A2/O) , relationships between the parameters and water quality were explored. It was found that when the CMICAO opera-tion went on under optimal conditions, the concentration of TN, NH4+-N, NO3--N and TP in the effluent was measured to be 9. 9, 1. 3, 6. 4 and 0. 47 mg·L-1 , respectively. During the operation, when the anoxic tank turned from positive into negative in d pH/d t, the anaerobic tank turned from negative into positive or approached to zero in d ORP/d t, the aero-bic tank turned from negative to near zero in d ORP/d t or soared up suddenly in dρ( DO)/d t, and the convertible reac-tion tank went on to the next phase of the operation;when the 1st-4th tanks finished their reactions for the first half of the cycle, the fifth would also finish its reaction for the first half of the cycle and enter the second half cycle. All the findings suggest that the state parameters ( DO, pH and ORP ) can be used as indicators for real-time control of the CMICAO process, thus enhancing its effect of N and P removal.%通过连续监测多点交替进水阶式A2/O(CMICAO)工艺上半周期各阶段每个反应池的状态参数〔溶解氧(DO)、pH值、氧化还原电位(ORP)〕与水质参数,分析状态参数与水质变化的相关关系. 当CMICAO工艺在优化工况下运行时,出水TN、NH4+-N、NO3--N和TP质量浓度分别为9. 9、1. 3、6. 4和0. 47 mg·L-1. 工艺运行中,当缺氧池d pH/d t( t为反应时间)由正转负、厌氧池d ORP/d t由负转为接近于0和好氧池d ORP/d t由正转为接近于0,或d ρ( DO)/d t突然增大时,可转变反应池的运行状态至下一阶段;当1~4号池上半周期反应结束时,5号池也结束上半周期,进入下半周期. 结果表明,可利用状态参数对CMICAO工艺的运行进行实时控制,以强化对氮磷的去除效果.
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