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首页> 外文期刊>Separation and Purification Technology >Removal of silica from brackish water by electrocoagulation pretreatment to prevent fouling of reverse osmosis membranes
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Removal of silica from brackish water by electrocoagulation pretreatment to prevent fouling of reverse osmosis membranes

机译：通过电凝预处理从微咸水中去除二氧化硅，以防止反渗透膜结垢

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Desalination of seawater and brackish water by reverse osmosis(RO)has become increasingly important for drinking water supply in a greater part of the world.The presence of high silica concentrations in some brackish water,however,limits the application of RO desalination due to the potential formation of silica scales that irreversibly deteriorate the membrane material and performance.This study investigates the feasibility of electrocoagulation as a pretreatment process to remove silica from the source brackish water.The effects of several electrical parameters,including electrode arrangement,current intensity and hydraulic retention time,were studied on the basis of silica removal efficiency.Bipolar configuration attained greater extent of silica removal as compared to monopolar configuration.Increases in charge loading generally improved the silica removal efficiency,but excessive hydraulic retention time(60 min)was detrimental to the system performance.In this study,with no modification of the source water,silica removal efficiency up to 80% was achieved under a current intensity of 0.5 A and a hydraulic retention time of 30 min.The subsequent nanofiltration studies demonstrated severe flux declines over the first 3 h,yielding only 70% of its initial flux for brackish water containing 100mg/L silica,and progressively lower with higher silica concentrations.For the pretreated water by electrocogulation,the extent of flux decline was markedly improved,suggesting that the pretreatment was effective for the attenuation of the flux decline.Electron micrograph images of the-membrane autopsy also confirmed the lack of scale formation for the pretreated water as compared to those without pretreatment.
机译：反渗透（RO）对海水和微咸水进行淡化对于世界上大部分地区的饮用水供应变得越来越重要。但是，由于微咸水在某些微咸水中存在高二氧化硅浓度，限制了RO淡化的应用。可能会不可逆转地破坏膜材料和性能的氧化硅垢的形成。时间，是基于除二氧化硅的效率来研究的。与单极性配置相比，双极性构型的二氧化硅去除程度更大。电荷负荷的增加通常会提高二氧化硅的去除效率，但是过多的水力停留时间（60分钟）不利于硅的去除。系统性能。在本研究中，无修改阳离子水，在0.5 A的电流强度和30分钟的水力停留时间下，去除硅的效率高达80％。随后的纳滤研究表明，在最初的3小时内，通量急剧下降，仅产生了70％的通量。对于含100mg / L二氧化硅的微咸水，其初始通量随着二氧化硅浓度的升高而逐渐降低。对于电凝预处理的水，通量下降的程度得到了显着改善，这表明预处理对于减少通量下降是有效的。膜尸检的电子显微镜图像也证实，与未经预处理的水相比，经过预处理的水缺乏垢的形成。

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