Response surface methodology (RSM) was conducted to study the effects of the key operation parameters combined or not on the performance of phosphorus removal with ferrous salt. The results showed that the effect of individual operation parameter on phosphorus removal was followed as the order of Fe(Ⅱ)/P>pH>FMS(flash mixing speed). The combined effects of the operation parameters were negative and the effects decreased in turn of Fe(Ⅱ)/P-FMS >pH-FMS>Fe(Ⅱ)/P-pH. "Priority/Combination" model was proposed to optimize the phosphorus removal with ferrous salt based on the results. The optimal operation parameters were Fe(Ⅱ)/P=3.32, pH=7.49, FMS=182r/min. The verification experiment with both synthetic and real wastewater showed that the model was valid and effective.%以响应曲面法研究了亚铁盐除磷过程主要操作条件(Fe(II)/P、pH值、快速搅拌速度(FMS)对废水除磷效果的单独效应和联合效应.试验结果表明,各操作条件对除磷效率的贡献排序为:Fe(II)/p＞pH值＞FMS；操作条件间的复合效应为负效应,其大小排序为:Fe(II)/P-FMS＞pH值-FMS＞Fe(II)/P-pH值.提出了“优先/联合”优化模式,确定了对于浓度为100mg/L的含磷废水,经优化的操作参数为:Fe(II)/P为3.32,pH值为7.49,FMS为182r/min.采用模拟废水和实际废水验证了该优化模式的实施效果,验证结果表明,“优先/联合”操作模式行之有效.
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