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    Title: Integration of ceramic membrane and compressed air-assisted solvent extraction (CASX) for metal recovery
    Authors: Li, Chi-wang;Chiu, Chun-hao;Lee, Yu-cheng;Chang, Chia-hao;Lee, Yu-hsun;Chen, Yi-ming
    Contributors: 淡江大學水資源及環境工程學系
    Keywords: ceramic membrane;dead-end filtration;recovery;solvent
    Date: 2010-06
    Issue Date: 2011-08-11 10:14:57 (UTC+8)
    Publisher: London: I W A Publishing
    Abstract: 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.
    Relation: Water Science and Technology 62(6), pp.1274-1280
    DOI: 10.2166/wst.2010.851
    Appears in Collections:[Graduate Institute & Department of Water Resources and Environmental Engineering] Journal Article

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