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Preparation and Characterization of a Composite Coagulant: Polyferric Titanium Sulfate
Chen, Wei1,2; Zheng, Huaili1,2; Guo, Jinsong3; Li, Fengting4; Tang, Xiaomin1; Liu, Bingzhi1; Zhou, Yuhao1
2016-03-01
摘要In this study, a novel composite coagulant polyferric titanium sulfate (PFTS) was synthesized and the kaolin-fulvic acid simulated water was employed to verify the coagulation efficiency. To obtain the optimal conditions for preparing the composite coagulant, the parameters affecting the coagulation performance such as Ti/Fe, P/Fe, OH/Fe, and oxidizer dosage were evaluated by single factor experiments and response surface methodology. The structure and morphology of PFTS were investigated by some conventional methods and those affecting coagulation-flocculation behaviors such as coagulant dosage, water sample initial pH, were also examined. Flocs properties of PFTS were investigated by Mastersizer 2000. The results indicated that PFTS presented a porous and a compacted gel network structure, in which some major phase structure and chemical bonds were discovered. The jar tests demonstrated the superior coagulation performance at coagulant dosage of 20-30 mg/L and the optimum pH range of 7-8. The optimum synthetic conditions were Ti/Fe, P/Fe, OH/Fe molar ratio and oxidant adding speed of 0.13, 0.25, 0.29, and 4 mL/min, respectively. Under the optimal condition, the residual turbidity, (Dissolved organic matter) DOC removal and residual iron of 0.82, 53 %, and 0.08 mg/L, respectively, could be acquired by PFTS. The flocs analysis results manifested that the dominant mechanism in flocs growth is absorption-bridging and sweeping coagulation, while charge neutralization mechanisms is the primary in the formation of compact flocs.
关键词Composite coagulant Polyferric sulfate Titanous sulfate Water treatment RSM
DOI10.1007/s11270-016-2766-6
发表期刊WATER AIR AND SOIL POLLUTION
ISSN0049-6979
卷号227期号:3页码:17
通讯作者Zheng, HL (reprint author), Chongqing Univ, State Minist Educ, Key Lab Three Gorges Reservoir Reg Ecoenvironm, Chongqing 400045, Peoples R China.
收录类别SCI
WOS记录号WOS:000371427300007
语种英语