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Optimization of Coagulation with PFS‐PDADMAC Composite Coagulants Using the Response Surface Methodology Experimental Design Technique
Author(s) -
Tshukudu Tiroyaone,
Zheng Huaili,
Yang Jun
Publication year - 2013
Publication title -
water environment research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.356
H-Index - 73
eISSN - 1554-7531
pISSN - 1061-4303
DOI - 10.2175/106143012x13560205144515
Subject(s) - response surface methodology , turbidity , central composite design , coagulation , flocculation , chemistry , composite number , chromatography , yield (engineering) , residual , pulp and paper industry , materials science , mathematics , composite material , organic chemistry , geology , psychology , oceanography , algorithm , psychiatry , engineering
In this study, two composite coagulants, PFPD 1 , and PFPD 2, were prepared and studied with the inorganic polymer coagulant PFS. A response surface design was used to investigate the effect that changes in the level of coagulant dose and coagulation pH have on residual turbidity and TOC. In addition, the optimum combinations of dose and pH, that yield the lowest residual turbidity and TOC, were determined. The results revealed that the optimum conditions for the three coagulants were a dosage of 204 mg/L and pH of 8.06 for PFS; a dosage of 179 mg/L and pH of 7.99 for PFPD 1 ; and a dosage of 112 mg/L and pH of 7.65 for PFPD 2 . The models showed that for residual turbidity, the effectiveness of the coagulants in decreasing order was PFS>PFPD 1 >PFPD 2 , while for residual TOC, the order was PFPD 2 >PFPD 1 >PFS. The verification experiments demonstrated that a RSM approach was appropriate for optimizing the coagulation‐flocculation process.