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Variables affecting melanoidins removal from molasses wastewater by coagulation/flocculation
Liang, Zhen; Wang, Yanxin; Zhou, Yu; Liu, Hui; Wu, Zhenbin; Wang, YX, China Univ Geosci, Sch Environm Studies, Wuhan 430074, Peoples R China
2009
Source PublicationSEPARATION AND PURIFICATION TECHNOLOGY
Volume68Issue:3Pages:382-389
AbstractCoagulation/flocculation process was applied in the polishing treatment of molasses wastewater on a bench-scale. Important operating variables, including coagulant type and dosage, solution pH, rapid mixing conditions as well as the type and dosage of polyeletrolytes were investigated based on the maximum removal efficiencies of chemical oxygen demand (COD) and color, residual turbidity and settling characteristics of flocs. HPSEC was utilized to evaluate the removal of molecular weight fractions of melanoidins-dominated organic compounds. Experimental results indicate that ferric chloride was the most effective among the conventional coagulants, achieving 89% COD and 98% color eliminations; while aluminum sulfate was the least effective, giving COD and color reductions of 66% and 86%, respectively. In addition to metal cations, counter-ions exert significant influence on the coagulation performance since Cl--based metal salts attained better removal efficiency than SO42--based ones at the optimal coagulant dosages. Coagulation of molasses effluent is a highly pH-dependent process, with better removal efficiency achieved at lower pH levels. Rapid mixing intensity, rather than rapid mixing time, has relatively strong influence on the settling characteristics of flocs formed. Lowering mixing intensity resulted in increasing settling rate but the accumulation of floating flocs. When used as coagulant aids, synthetic polyelectrolytes showed little effects on the improvement in organic removal. On the other hand, cationic polyacrylamide was observed to substantially enhance the settleability of flocs as compared to anionic polyacrylamide. The effects of rapid mixing conditions and polymer flocculants on the coagulation performance were discussed. (C) 2009 Elsevier B.V. All rights reserved.
KeywordMolasses Wastewater Coagulation Rapid Mixing Parameters Coagulant Aids Settling Characteristics
Department[Liang, Zhen; Wang, Yanxin; Zhou, Yu; Liu, Hui] China Univ Geosci, Sch Environm Studies, Wuhan 430074, Peoples R China; [Liang, Zhen; Wang, Yanxin; Zhou, Yu; Liu, Hui] China Univ Geosci, MOE Key Lab Biogeol & Environm Geol, Wuhan 430074, Peoples R China; [Liang, Zhen; Wu, Zhenbin] Chinese Acad Sci, Inst Hydrobiol, State Key Lab Freshwater Ecol & Biotechnol, Wuhan 430072, Peoples R China
Subject AreaEngineering, Chemical
Funding OrganizationNational Natural Science Foundation of China [40830748]; China Postdoctoral Science Foundation [20080440976]; Ministry of Environmental Protection of China ; National Natural Science Foundation of China [40830748]; China Postdoctoral Science Foundation [20080440976]; Ministry of Environmental Protection of China ; National Natural Science Foundation of China [40830748]; China Postdoctoral Science Foundation [20080440976]; Ministry of Environmental Protection of China ; National Natural Science Foundation of China [40830748]; China Postdoctoral Science Foundation [20080440976]; Ministry of Environmental Protection of China
Indexed BySCI
Language英语
WOS IDWOS:000269416600013
Funding OrganizationNational Natural Science Foundation of China [40830748]; China Postdoctoral Science Foundation [20080440976]; Ministry of Environmental Protection of China ; National Natural Science Foundation of China [40830748]; China Postdoctoral Science Foundation [20080440976]; Ministry of Environmental Protection of China ; National Natural Science Foundation of China [40830748]; China Postdoctoral Science Foundation [20080440976]; Ministry of Environmental Protection of China ; National Natural Science Foundation of China [40830748]; China Postdoctoral Science Foundation [20080440976]; Ministry of Environmental Protection of China
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Cited Times:42[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ihb.ac.cn/handle/152342/7596
Collection期刊论文
Corresponding AuthorWang, YX, China Univ Geosci, Sch Environm Studies, Wuhan 430074, Peoples R China
Recommended Citation
GB/T 7714
Liang, Zhen,Wang, Yanxin,Zhou, Yu,et al. Variables affecting melanoidins removal from molasses wastewater by coagulation/flocculation[J]. SEPARATION AND PURIFICATION TECHNOLOGY,2009,68(3):382-389.
APA Liang, Zhen,Wang, Yanxin,Zhou, Yu,Liu, Hui,Wu, Zhenbin,&Wang, YX, China Univ Geosci, Sch Environm Studies, Wuhan 430074, Peoples R China.(2009).Variables affecting melanoidins removal from molasses wastewater by coagulation/flocculation.SEPARATION AND PURIFICATION TECHNOLOGY,68(3),382-389.
MLA Liang, Zhen,et al."Variables affecting melanoidins removal from molasses wastewater by coagulation/flocculation".SEPARATION AND PURIFICATION TECHNOLOGY 68.3(2009):382-389.
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