Seawater pretreatment for thermal plant by pressure stimuli-responsive forward osmosis membrane

IF 8 Q1 ENERGY & FUELS
Daoud Khanafer , Ali Altaee , Alaa H. Hawari , Yahia Aedan , John Zhou , Akshaya K. Samal
{"title":"Seawater pretreatment for thermal plant by pressure stimuli-responsive forward osmosis membrane","authors":"Daoud Khanafer ,&nbsp;Ali Altaee ,&nbsp;Alaa H. Hawari ,&nbsp;Yahia Aedan ,&nbsp;John Zhou ,&nbsp;Akshaya K. Samal","doi":"10.1016/j.nexus.2025.100488","DOIUrl":null,"url":null,"abstract":"<div><div>Scale formation and deposition on the heat exchanger of thermal desalination have serious consequences on the plant performance and energy consumption. This study presented a patented method for diluting the brine from the multi-stage flash (MSF) plant with seawater using nanofiltration (NF) membranes of specific characteristics in the forward osmosis (FO) process. Three flat-sheet NF membranes of &lt; 200 µm structure parameter were tested as pressure stimuli-responsive (PSR) membranes in the FO process. The NF membranes are designed to reject divalent ions, such as sulfate, magnesium, and calcium, which are the main reason for scale formation and deposition in the MSF plant. In this study, the performance of cellulose triacetate (CTA) and thin film-composite (TFC) FO membrane was compared with the PSR NF membranes for seawater pretreatment using an MSF brine draw solution at 40 °C. The water flux in the PSR NF membrane was insignificant at 0 bar pressure but increased several times when the feed pressure increased to 2 and 4 bar pressure. For the FO tests at 4 bar pressure, the average water flux in the PSR membranes was up to 2.6 times more than that in the CTA and TFC FO membranes, all without increasing the energy requirements of the FO process. In the tight NF membrane, the MSF brine dilution occurred by the permeation flow, but in the loose NF membrane, it was by permeation flow and ions' reverse diffusion from the draw solution to the feed solution. Notably, the PSR NF membranes achieved a substantial cost reduction that is ten times cheaper than the FO membrane, which has excellent potential to reduce the cost of the FO process.</div></div>","PeriodicalId":93548,"journal":{"name":"Energy nexus","volume":"19 ","pages":"Article 100488"},"PeriodicalIF":8.0000,"publicationDate":"2025-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Energy nexus","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2772427125001299","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENERGY & FUELS","Score":null,"Total":0}
引用次数: 0

Abstract

Scale formation and deposition on the heat exchanger of thermal desalination have serious consequences on the plant performance and energy consumption. This study presented a patented method for diluting the brine from the multi-stage flash (MSF) plant with seawater using nanofiltration (NF) membranes of specific characteristics in the forward osmosis (FO) process. Three flat-sheet NF membranes of < 200 µm structure parameter were tested as pressure stimuli-responsive (PSR) membranes in the FO process. The NF membranes are designed to reject divalent ions, such as sulfate, magnesium, and calcium, which are the main reason for scale formation and deposition in the MSF plant. In this study, the performance of cellulose triacetate (CTA) and thin film-composite (TFC) FO membrane was compared with the PSR NF membranes for seawater pretreatment using an MSF brine draw solution at 40 °C. The water flux in the PSR NF membrane was insignificant at 0 bar pressure but increased several times when the feed pressure increased to 2 and 4 bar pressure. For the FO tests at 4 bar pressure, the average water flux in the PSR membranes was up to 2.6 times more than that in the CTA and TFC FO membranes, all without increasing the energy requirements of the FO process. In the tight NF membrane, the MSF brine dilution occurred by the permeation flow, but in the loose NF membrane, it was by permeation flow and ions' reverse diffusion from the draw solution to the feed solution. Notably, the PSR NF membranes achieved a substantial cost reduction that is ten times cheaper than the FO membrane, which has excellent potential to reduce the cost of the FO process.
压力刺激响应正向渗透膜预处理热电厂海水
热脱盐换热器上结垢和结垢对设备性能和能耗造成严重影响。本研究提出了一种利用正渗透(FO)过程中具有特定特性的纳滤(NF)膜,用海水稀释多级闪蒸(MSF)装置卤水的专利方法。三种<平板NF膜;将200µm结构参数作为压力刺激响应(PSR)膜在FO过程中进行测试。滤膜的设计目的是排斥二价离子,如硫酸盐、镁和钙,这些离子是MSF工厂中结垢和沉积的主要原因。在本研究中,比较了三醋酸纤维素(CTA)和薄膜复合(TFC) FO膜与PSR NF膜在40°C的MSF盐水抽取溶液中预处理海水的性能。在0 bar压力下,PSR - NF膜中的水通量不显著,但当进料压力增加到2和4 bar压力时,水通量增加了几倍。在4 bar压力下进行的FO测试中,PSR膜中的平均水通量是CTA和TFC膜中的2.6倍,并且没有增加FO过程的能量需求。在致密的纳滤膜中,MSF盐水的稀释是通过渗透流动发生的,而在松散的纳滤膜中,MSF盐水的稀释是通过渗透流动和离子从抽提液向进料液的反向扩散发生的。值得注意的是,PSR NF膜的成本大幅降低,比FO膜便宜十倍,这在降低FO工艺成本方面具有很大的潜力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
求助全文
约1分钟内获得全文 求助全文
来源期刊
Energy nexus
Energy nexus Energy (General), Ecological Modelling, Renewable Energy, Sustainability and the Environment, Water Science and Technology, Agricultural and Biological Sciences (General)
CiteScore
7.70
自引率
0.00%
发文量
0
审稿时长
109 days
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
copy
已复制链接
快去分享给好友吧!
我知道了
右上角分享
点击右上角分享
0
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:604180095
Book学术官方微信