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首页> 外文期刊>Desalination: The International Journal on the Science and Technology of Desalting and Water Purification >Pressure-driven membrane operations and membrane distillation technology integration for water purification
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Pressure-driven membrane operations and membrane distillation technology integration for water purification

机译：压力驱动的膜操作和膜蒸馏技术集成，用于水净化

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In the last years,boron and arsenic are gaining wide attention in the water treatment community due to their adverse effects both on human/animal health and on agriculture.As a consequence,nowadays,the number of water treatment plants equipped with boron and arsenic removal facilities is growing.Usually it is difficult to remove them from water due to their size and charge.Therefore,in order to obtain substantial arsenic and boron reduction in the treated water,the most part of the desalination/purification plants have to use chemicals agents and Reverse Osmosis (RO) systems with several pass-stages.In this paper the potentialities of Membrane Distillation (MD) as a new and innovative technique for contaminants removal from water were investigated.The purposes of the present work are as follows:1) to examine the efficiency of different pressure driven membrane processes for boron and arsenic removal from water;2) to test experimentally the performance of Membrane Distillation for water purification;3) to analyse and propose an innovative integrated system for the contaminants removal from water.In the proposed flow sheet,pressure-driven membrane operations have been synergically joined with membrane distillation technology for reaching the Process Intensification goals thanks to the possibility of overcoming the limits of the single units and,thus,to improve the performance of the overall operation.The designed system is constituted by a Reverse Osmosis (RO) step followed by a Membrane Distillation (MD) one.In this process in order to achieve,in the produced fresh water,a boron and arsenic concentration equal or less the maximum recommended values,only 36% of the RO permeate has to be sent to the MD module.Moreover MD operation allows total boron arsenic removal from water without the use of chemical agents,which results in less chemical cost and,above all,in a less environmental impact.
机译：近年来，硼和砷由于对人类/动物健康和农业产生不利影响而在水处理界引起了广泛关注。结果，如今，配备硼和砷去除的水处理厂的数量有所增加。通常，由于其大小和电荷，很难将其从水中去除。因此，为了使处理后的水中的砷和硼大量减少，大多数脱盐/提纯工厂必须使用化学试剂。本文研究了膜蒸馏（MD）作为一种从水中去除污染物的新技术的潜力。本文的目的如下：1）检验不同压力驱动的膜法从水中去除硼和砷的效率; 2）通过实验测试水的膜蒸馏性能纯化; 3）分析并提出创新的集成系统以去除水中的污染物。在拟议的流程中，由于克服了可能，压力驱动的膜操作已与膜蒸馏技术协同作用，以达到工艺强化目标限制了单个单元的数量，从而提高了整体操作的性能。设计的系统由反渗透（RO）步骤和膜蒸馏（MD）步骤组成。在此过程中，在生产的淡水中，硼和砷的浓度等于或小于最大推荐值，仅需将36％的RO渗透物送入MD模块。此外，MD操作允许在不使用化学药品的情况下从水中去除总硼砷剂，从而降低了化学成本，最重要的是，对环境的影响也较小。

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