The hydrolysis behaviors of polyferric sulfate (PFS) and ferric sulfate (FS) under conditions similar to raw wastewater were investigated and the coagulation of biologically pretreated molasses wastewater using PFS and FS was evaluated by studying coagulation efficiency, zeta potential and microscopic surface morphology of flocs. Experimental results show that the hydrolysis behavior of PFS is different from that of FS on the basis of ferron assay. In the case of FS, fast-reacting Fe(III) polymers were the dominant polynuclear species while large fraction of slow-reacting iron polymers is present in PFS. Despite slightly fewer dosages of PFS required as compared to FS, there is no marked difference in the coagulation of molasses effluent between PFS and FS, especially at the optimum dosages. Both coagulants destabilize organic compounds predominantly through charge neutralization-precipitation mechanism. Hydrolysis rate of PFS in synthetic solution is appreciably different from that in raw wastewater. This may due to the effect of sulfate anion introduced as counter-ion as well as depolymerization of larger polymeric Fe(III) species by the organic ligands present in molasses effluent.
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Research Article|
March 01 2009
Hydrolysis and coagulation behavior of polyferric sulfate and ferric sulfate
Zhen Liang;
1State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China E-mail: liangzhenren@126.com; wuzb@ihb.ac.cn
2School of Environmental Studies and MOE Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan 430074, China Tel.: +86-27-67883998 Fax:
+86-27-87481030
E-mail: yx.wang@cug.edu.cn; lixiangzy@126.com; jhzhou168@163.comE-mail: liangzhenren@126.com
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Yanxin Wang;
Yanxin Wang
2School of Environmental Studies and MOE Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan 430074, China Tel.: +86-27-67883998 Fax:
+86-27-87481030
E-mail: yx.wang@cug.edu.cn; lixiangzy@126.com; jhzhou168@163.com
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Yu Zhou;
Yu Zhou
2School of Environmental Studies and MOE Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan 430074, China Tel.: +86-27-67883998 Fax:
+86-27-87481030
E-mail: yx.wang@cug.edu.cn; lixiangzy@126.com; jhzhou168@163.com
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Hui Liu;
Hui Liu
2School of Environmental Studies and MOE Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan 430074, China Tel.: +86-27-67883998 Fax:
+86-27-87481030
E-mail: yx.wang@cug.edu.cn; lixiangzy@126.com; jhzhou168@163.com
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Zhenbin Wu
Zhenbin Wu
2School of Environmental Studies and MOE Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan 430074, China Tel.: +86-27-67883998 Fax:
+86-27-87481030
E-mail: yx.wang@cug.edu.cn; lixiangzy@126.com; jhzhou168@163.com
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Water Sci Technol (2009) 59 (6): 1129–1135.
Citation
Zhen Liang, Yanxin Wang, Yu Zhou, Hui Liu, Zhenbin Wu; Hydrolysis and coagulation behavior of polyferric sulfate and ferric sulfate. Water Sci Technol 1 March 2009; 59 (6): 1129–1135. doi: https://doi.org/10.2166/wst.2009.096
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