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The potential of hollow fiber vacuum multi-effect membrane distillation for brine treatment

机译：盐水处理中空纤维真空多效膜蒸馏的潜力

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摘要

Vacuum membrane distillation can extract pure water from degraded sources, but it requires relatively high energy inputs as compared to other thermal-driven technologies. As a commercially successful example, Memsys Water Technologies GmbH has addressed this key limitation by developing a flat sheet-based vacuum membrane distillation module where the latent heat recycled internally by using multiple distillation effects. In this paper, we propose an alternative hollow fiber-based design which also recycles the latent heat with multiple effects, but with an even more compact membrane packing format. The proposed design uses 3-dimensional printing to 'unlock' this configuration via a hollow aluminium alloy baffle which relies on its low thermal resistance to recover the latent heat effectively. The printed metal baffle (0.8 mm wall thickness) was calculated to have a very high conductive heat transfer coefficient, similar to 180 kW/m(2)K (surpassing even the similar to 20 mu m polypropylene foil used in the Memsys module, which has a conductance of similar to 10 kW/m(2)K). Our experimental and theoretical results indicate that this design uses a condensation-convection-distillation heat and mass transfer mechanism which enables a three-effect system to reduce the energy consumption by similar to 60% over a single-effect design (i.e. from 672 kWh/m(3) to 263 kWh/m(3)) for synthetic geothermal brine (-200 g/L salt concentration). Furthermore, the prototype reached a high average permeate flux of similar to 5.1 LMH and a salt rejection rate of 99.99%, approaching zero liquid discharge. Overall, this work suggests that hollow fiber membranes can indeed be used in a multi-effect mode and represents a promising new pathway for membrane distillation.
机译：真空膜蒸馏可以从降解的源中提取纯水，但与其他热驱动技术相比，它需要相对高的能量输入。作为商业成功的例子，Memsys Water Technologies GmbH通过开发基于平板的真空膜蒸馏模块来解决了这种关键限制，其中通过使用多个蒸馏效果来潜伏在内部再循环。在本文中，我们提出了一种基于替代的中空纤维的设计，其还通过多种效果回收潜热，但具有更紧凑的膜填料格式。所提出的设计通过中空铝合金挡板使用三维印刷来“解锁”这种配置，依靠其低热阻以有效地回收潜热。计算印刷金属挡板（0.8mm壁厚）以具有非常高的导电传热系数，类似于180kW / m（2）k（即使类似于MEMSYS模块中使用的20μm聚丙烯箔）电导率类似于10 kW / m（2）k）。我们的实验和理论结果表明，该设计使用冷凝 - 对流蒸馏热量和传质机制，使三效系统能够通过单一效果设计（即672千瓦时/的60％）降低能量消耗。用于合成地热盐水（-200g / L盐浓度）的M（3）至263千瓦时/ m（3））。此外，原型达到了与5.1LmH的高平均渗透剂通量，即> 99.99％的盐排斥率，接近零液体排出。总的来说，这项工作表明，中空纤维膜确实可以在多效模式下使用，并且代表膜蒸馏的有希望的新途径。

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  • 来源
    《Applied Energy》 |2020年第15期|115437.1-115437.14|共14页
  • 作者

    Li Qiyuan; Omar Amr; Cha-Umpong Withita; Liu Qian; Li Xiaopeng; Wen Jianping; Wang Yinfeng; Razmjou Amir; Guan Jing; Taylor Robert A.;

  • 作者单位

    Univ New South Wales UNSW Sch Chem Engn Kensington NSW 2052 Australia|Univ New South Wales UNSW Sch Mech & Mfg Engn Kensington NSW 2052 Australia;

    Univ New South Wales UNSW Sch Mech & Mfg Engn Kensington NSW 2052 Australia;

    Univ New South Wales UNSW Sch Chem Engn Kensington NSW 2052 Australia;

    Univ New South Wales UNSW Sch Mech & Mfg Engn Kensington NSW 2052 Australia;

    Univ New South Wales UNSW Sch Mech & Mfg Engn Kensington NSW 2052 Australia;

    Beijing OriginWater Technol Co Ltd Beijing 101400 Peoples R China;

    Nanjing Tech Univ Sch Energy Sci & Engn Nanjing 211816 Peoples R China;

    Univ New South Wales UNSW Sch Chem Engn Kensington NSW 2052 Australia;

    Beijing OriginWater Technol Co Ltd Beijing 101400 Peoples R China;

    Univ New South Wales UNSW Sch Mech & Mfg Engn Kensington NSW 2052 Australia|Univ New South Wales UNSW Sch Photovolta & Renewable Energy Engn Kensington NSW 2052 Australia;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Multi-effect membrane distillation; Latent heat recovery; Heat exchanger; Brine treatment; Desalination; Metal 3D printing;

    机译：多效膜蒸馏;潜热回收;换热器;盐水处理;海水淡化;金属3D印刷;

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