Integration of ceramic membrane and compressed air-assisted solvent extraction (CASX) for metal recovery
學年 98
學期 2
出版（發表）日期 2010-06-01
作品名稱 Integration of ceramic membrane and compressed air-assisted solvent extraction (CASX) for metal recovery
作品名稱（其他語言）
著者 Li, Chi-wang; Chiu, Chun-hao; Lee, Yu-cheng; Chang, Chia-hao; Lee, Yu-hsun; Chen, Yi-ming
單位 淡江大學水資源及環境工程學系
出版者 London: I W A Publishing
著錄名稱、卷期、頁數 Water Science and Technology 62(6), pp.1274-1280
摘要 In our previous publications, compressed air-assisted solvent extraction process (CASX) was developed and proved to be kinetically efficient process for metal removal. In the current study, CASX with a ceramic MF membrane integrated for separation of spent solvent was employed to remove and recover metal from wastewater. MF was operated either in crossflow mode or dead-end with intermittent flushing mode. Under crossflow mode, three distinct stages of flux vs. TMP (trans-membrane pressure) relationship were observed. In the first stage, flux increases with increasing TMP which is followed by the stage of stable flux with increasing TMP. After reaching a threshold TMP which is dependent of crossflow velocity, flux increases again with increasing TMP. At the last stage, solvent was pushed through membrane pores as indicated by increasing permeate COD. In dead-end with intermittent flushing mode, an intermittent flushing flow (2 min after a 10-min or a 30-min dead-end filtration) was incorporated to reduce membrane fouling by flush out MSAB accumulated on membrane surface. Effects of solvent concentration and composition were also investigated. Solvent concentrations ranging from 0.1 to 1% (w/w) have no adverse effect in terms of membrane fouling. However, solvent composition, i.e. D(2)EHPA/kerosene ratio, shows impact on membrane fouling. The type of metal extractants employed in CASX has significant impact on both membrane fouling and the quality of filtrate due to the differences in their viscosity and water solubility. Separation of MSAB was the limiting process controlling metal removal efficiency, and the removal efficiency of Cd(II) and Cr(VI) followed the same trend as that for COD.
關鍵字 ceramic membrane; dead-end filtration; recovery; solvent
語言 en
ISSN 0273-1223
期刊性質 國外
收錄於 SCI EI
產學合作
通訊作者 Li, Chi-wang
審稿制度
國別 GBR
公開徵稿
出版型式 紙本
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