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    Membrane distillation for industrial wastewater treatment: Studying the effects of membrane parameters on the wetting performance

    Year: 2018

    Journal: Chemosphere, Volume 206, SEP, page 793–801

    Authors: Damtie, Mekdimu Mezemir; Kim, Bongchul; Woo, Yun Chul; Choi, June-Seok

    Organizations: UST (Daejeon); Industrial Facilities & Infrastructure Research Program - Ministry of Land, Infrastructure, and Transport of Korean government under Korean Institute of civil engineering and building technology (MCI) [17IFIP-B065893-05]

    Keywords: Membrane distillation; Defluoridation; Membrane parameters; Industrial wastewater; DCMD wetting

    Substantial amounts of trace hazardous elements have been detected in industrial wastewater (e.g fluoride > 900 mg/L). Feed water characteristics, operational parameters, and membrane properties are major factors affecting flux and rejection of the MD process. Membrane parameters such as membrane material type and pore size have been investigated. Fluoride ion rejection was selected to setup a methodology to remove trace elements from wastewater by adjusting the membrane parameters in DCMD. Study of the fouling thickness of the MD membrane using pH and feed water composition revealed that a PVDF membrane with a smooth surface holds a thicker fouling layer, which enhances fluoride rejection while reducing the permeate flux. On the other hand, PTFE and PP membranes showed higher mass transfer and higher wetting performance, respectively. Therefore,a PVDF membrane with low organic feed water at higher alkaline pH can be utilized to obtain high-quality permeate, while PTFE can provide the highest flux with acceptable permeate water quality. Therefore, this methodology can be applied toidentify the optimum membrane to fit the required permeate flux, rejection requirements,and operating pH to treat any kind of non-volatileinorganic pollutants from industrial wastewater. (C) 2018 Elsevier Ltd. All rights reserved.
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