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首页> 外文期刊>Environmental Engineering Science >A Novel Method for Investigating the Influence of Feed Water Recovery on Colloidal and NOM Fouling of RO and NF Membranes
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A Novel Method for Investigating the Influence of Feed Water Recovery on Colloidal and NOM Fouling of RO and NF Membranes

机译:调查给水回收率对RO和NF膜的胶体和NOM结垢影响的新方法

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摘要

A systematic investigation on the role of feed water recovery (or concentration factor) in colloidal and natural organic matter (NOM) fouling of reverse osmosis (RO) and nanofiltration (NF) membranes is reported. Fouling experiments were conducted using a laboratory-scale crossflow test unit with continuous permeate disposal to simulate concentration factor (CF) and feed water recovery as commonly observed in full-scale RO/NF systems. With this novel method, the deterioration in membrane performance due to fouling and recovery-related osmotic pressure buildup can be distinguished. For colloidal fouling of RO membranes, the so-called "cake enhanced osmotic pressure" is a key fouling mechanism resulting in severe decline in permeate flux and significant decrease in salt rejection with increasing CF. On the other hand, NOM-calcium complexation rather than enhanced osmotic pressure is the key mechanism for NOM fouling of NF membranes. The decline in permeate flux and decrease in solute rejection with increasing CF were significant under favorable conditions for fouling, namely at higher initial permeate flux, ionic strength, and calcium ion concentration.
机译:对进水回收率(或浓缩因子)在反渗透(RO)和纳滤(NF)膜的胶体和天然有机物(NOM)结垢中的作用进行了系统研究。使用实验室规模的错流测试装置进行污垢实验,该装置具有连续的渗透物处理功能,以模拟浓缩因子(CF)和给水回收率,这在全尺寸RO / NF系统中通常会观察到。用这种新颖的方法,可以区分由于结垢和与恢复有关的渗透压积累而引起的膜性能的下降。对于RO膜的胶体结垢,所谓的“滤饼增强的渗透压”是一个关键的结垢机制,可导致渗透通量严重下降,并且随着CF的增加,盐分截留率显着下降。另一方面,NOM-钙的络合而不是增加的渗透压是NF膜NOM结垢的关键机制。在有利的结垢条件下,即在较高的初始渗透通量,离子强度和钙离子浓度下,随着CF的增加,渗透通量的下降和溶质截留率的降低是显着的。

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