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题名: Fouling behavior and scaling mitigation strategy of CaSO4 in submerged vacuum membrane distillation
作者: Zou, Tong1, 2;  Dong, Xiangling1, 2;  Kang, Guodong1;  Zhou, Meiqing1;  Li, Meng1;  Cao, Yiming1
关键词: Submerged membrane distillation ;  Fouling ;  Scaling mitigation ;  Air backwash
刊名: DESALINATION
发表日期: 2017-10-29
DOI: 10.1016/j.desal.2017.10.015
卷: 425, 页:86-93
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Technology ;  Physical Sciences
类目[WOS]: Engineering, Chemical ;  Water Resources
研究领域[WOS]: Engineering ;  Water Resources
英文摘要: Fouling and scaling in membrane distillation (MD) is one of the major obstacles to its long term stability. Submerging the membrane directly into the feed is an alternative method to prevent flow channel blockage. The fouling behavior of CaSO4 in submerged vacuum membrane distillation at varying experimental conditions was investigated. It presented a two-stage trend when the initial concentration of CaSO4 was < 2700 mg/L. Dramatic flux decline occurred once the feed was concentrated to a critical level of saturation. A on-line periodically air backwash was applied to reduce CaSO4 crystals deposition on the membrane surface or penetration in the membrane pores. While the role of air bubbles in affecting the fouling behavior of CaSO4 largely depended on the crystal formation mechanism. The fouling rate was reduced by 54% with the help of air backwash when surface crystallization controlled the process while negligible effect was made when bulk crystallization played a more important role. The result could be explained by combining the experimental data with a first-order kinetic model proposed by Tansel. The off-line water cleaning suggested that the fouling layer could be removed effectively without additional chemical agent.
关键词[WOS]: HOLLOW-FIBER MEMBRANES ;  DESALINATION APPLICATIONS ;  MASS-TRANSFER ;  WATER ;  PRETREATMENT ;  PERFORMANCE ;  RESISTANCES ;  PARAMETERS ;  FILTRATION ;  OSMOSIS
语种: 英语
WOS记录号: WOS:000414890300008
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/149785
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, Dalian Inst Chem Phys, Dalian Natl Lab Clean Energy DNL, Dalian 116023, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China

Recommended Citation:
Zou, Tong,Dong, Xiangling,Kang, Guodong,et al. Fouling behavior and scaling mitigation strategy of CaSO4 in submerged vacuum membrane distillation[J]. DESALINATION,2017,425:86-93.
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