COD Removal from Domestic Sewage by Response Surface Optimization Flocculation
In order to explore the optimal process conditions for COD removal in domestic sewage,the effects of PAC dosage,pH value,PAM dosage and stirring speed on COD removal rate were investigated by single factor test and response surface optimization test.The results show that,combined with the predicted value of Design-Expert software and the verification experiment,the optimal process parameters of COD re-moval in sewage are as follows:PAC dosage is 0.4 mL,pH=7.5,PAM dosage is 7.5 mL,stirring speed is 150 r/min,under these conditions,the predicted COD removal rate is 77.75%,the measured value is(75.89±1.36)%.The predicted value is close to the measured value.
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