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学科主题: Engineering, Chemical
题名: Variables affecting melanoidins removal from molasses wastewater by coagulation/flocculation
作者: Liang, Zhen1, 2, 3; Wang, Yanxin1, 2; Zhou, Yu1, 2; Liu, Hui1, 2; Wu, Zhenbin3
通讯作者: Wang, YX, China Univ Geosci, Sch Environm Studies, Wuhan 430074, Peoples R China
关键词: Molasses wastewater ; Coagulation ; Rapid mixing parameters ; Coagulant aids ; Settling characteristics
刊名: SEPARATION AND PURIFICATION TECHNOLOGY
发表日期: 2009-08-25
DOI: 10.1016/j.seppur.2009.06.011
卷: 68, 期:3, 页:382-389
收录类别: SCI
文章类型: Article
部门归属: [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
WOS标题词: Science & Technology ; Technology
资助者: National Natural Science Foundation of China [40830748]; China Postdoctoral Science Foundation [20080440976]; Ministry of Environmental Protection of China
类目[WOS]: Engineering, Chemical
研究领域[WOS]: Engineering
摘要: Coagulation/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.
英文摘要: Coagulation/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 SO(4)(2-)-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.
关键词[WOS]: ORGANIC-MATTER ; FERRIC-CHLORIDE ; COAGULATION ; FLOCCULATION ; DECOLORIZATION ; POLYELECTROLYTES ; POLYMERS ; EFFLUENT ; DESIGN ; SALTS
语种: 英语
WOS记录号: WOS:000269416600013
ISSN号: 1383-5866
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.ihb.ac.cn/handle/152342/7596
Appears in Collections:中科院水生所知识产出(2009年前)_期刊论文

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作者单位: 1.China Univ Geosci, Sch Environm Studies, Wuhan 430074, Peoples R China
2.China Univ Geosci, MOE Key Lab Biogeol & Environm Geol, Wuhan 430074, Peoples R China
3.Chinese Acad Sci, Inst Hydrobiol, State Key Lab Freshwater Ecol & Biotechnol, Wuhan 430072, Peoples R China

Recommended Citation:
Liang, Zhen; Wang, Yanxin; Zhou, Yu; Liu, Hui; Wu, Zhenbin.Variables affecting melanoidins removal from molasses wastewater by coagulation/flocculation,SEPARATION AND PURIFICATION TECHNOLOGY,2009,68(3):382-389
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