Application of response surface method as an experimental design to optimize coagulation–flocculation process for pre-treating paper wastewater

다국어 초록 (Multilingual Abstract)

The response surface methodology (RSM) was employed to study the pre-treatment of paper wastewaterwith polyaluminum chloride (PAC) as the coagulant and cationic polyacrylamide (c-PAM), as theflocculant in the coagulation–flocculation (CF) process. In addition, the three quadratic models of thethree factors of PAC dosage, PAM dosage, and pH were established with the chemical oxygen demand(COD), total suspended solids (TSS), and sludge volume index (SVI) as three responses. The optimalconditions obtained from the compromise of the three desirable responses are PAC 3689 mg/L, PAM39.9 mg/L, and pH 5.4, respectively. From zeta potential measurement, it was concluded that chargeneutralization is the main mechanism of coagulation at slightly acid pH, and c-PAM is very effective inthe bridge effect. Additionally, the results offered a certain reference value for the practical application ofthe CF process using hybrid PAC and c-PAM in stabilized paper pretreatment for COD and TSS removal.

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