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首页> 外文期刊>Journal of industrial and engineering chemistry >Study of flux decline and solute diffusion on an osmotically driven membrane process potentially applied to municipal wastewater reclamation
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Study of flux decline and solute diffusion on an osmotically driven membrane process potentially applied to municipal wastewater reclamation

机译：渗透驱动膜工艺中通量下降和溶质扩散的研究可能应用于市政废水回收

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One major challenge in this study was to investigate the performance of an osmotically driven membrane process, such as forward osmosis (FO) in a case of using raw wastewater that was obtained from a municipal wastewater treatment plant, with a focus on the flux decline and solute diffusion. First, to determine the effect of suspended solids (SS) in wastewater, wastewater was used containing 20 SS mg/L and filtered by a 0.45 mu m filter to remove the SS. The results showed that a noticeable flux decline was observed in the case of the existing SS, but flux was slightly decreased without the SS. Furthermore, a larger decline in reverse salt flux (J(s)) was also obtained with the SS, thus it can be implied that cake enhanced osmotic pressure (CEOP) phenomenon occurred. In other words, the SS could accelerate membrane fouling, resulting in a flux decline and hindered reverse salt diffusion. There was also a comparison of the FO performance using wastewater and a MBR permeate. As hypothesized, it has been found that wastewater resulted in a higher flux and reverse salt flux (J(s)) decline through the consecutive fouling experiments (four times), but a MBR permeate also brought about substantial flux decline, which was contrary to what was conjecture. These findings indicate that an effective method to control fouling, such as pretreatment and cleaning, may be required even if the treated water resulting from wastewater treatment is used as feed water. As the fouling was getting severe, UV254 rejection was gradually decreased. That phenomenon might possibly be attributed to the increased humic substances on the membrane surface, changes in the membrane characteristics, and J(s) decline. (C) 2015 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
机译：这项研究的主要挑战是研究渗透驱动膜工艺的性能，例如在使用从市政废水处理厂获得的原废水的情况下的正向渗透（FO），重点是通量下降和溶质扩散。首先，为了确定废水中悬浮固体（SS）的影响，使用了含20 SS mg / L的废水，并用0.45微米的过滤器过滤以去除SS。结果表明，在现有的SS情况下，通量明显下降，但在没有SS的情况下通量略有下降。此外，利用SS还获得了较大的反向盐通量（J（s））下降，因此可以暗示发生了滤饼增强的渗透压（CEOP）现象。换句话说，SS可能会加速膜结垢，导致通量下降并阻碍盐反向扩散。还对使用废水和MBR渗透液的FO性能进行了比较。如假设，通过连续的结垢实验（四次），发现废水导致较高的通量和反向盐通量（J（s））下降，但是MBR渗透物也导致通量大幅下降，这与什么是猜想。这些发现表明，即使将废水处理产生的处理水用作给水，也可能需要一种有效的控制结垢的方法，例如预处理和清洁。随着结垢变得越来越严重，UV254排斥率逐渐降低。该现象可能归因于膜表面上腐殖质的增加，膜特性的变化以及J（s）的下降。 （C）2015韩国工业和工程化学学会。由Elsevier B.V.发布。保留所有权利。

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