Design of an ammonium chloride aqueous solution concentration process using osmotically assisted reverse osmosis (OARO)

IF 9 1区工程技术 Q1 ENGINEERING, CHEMICAL Separation and Purification Technology Pub Date : 2025-08-14 Epub Date: 2025-02-24 DOI:10.1016/j.seppur.2025.132266

Yota Fujii , Shuya Yoneyama , Masaru Nakaiwa , Keigo Matsuda

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Abstract

This study evaluated the separation performance of an ammonium ion concentration process in aqueous solutions using osmotically assisted reverse osmosis (OARO) membrane separation. The investigation focused on the advanced separation of an aqueous ammonium chloride solution (flow rate: 1000 kg/day, concentration: 0.4 wt%) by analyzing discharge pressure, membrane area, and reflux ratio as the main parameters for both OARO and RO systems. The results indicated that OARO achieved higher separation performance and energy efficiency compared to RO under conditions where discharge pressure exceeded 4.0 MPa, the reflux ratio was above 7.2, and the membrane area was at least 45 m². It was found that as the discharge pressure, membrane area and reflux ratio increased in OARO, the concentration ratio increased up to 50 times. Notably, it was suggested that reducing the membrane area towards the downstream side in OARO improves the concentration performance regardless of the total membrane area, identifying this as a key parameter in process design.

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渗透辅助反渗透（OARO）氯化铵水溶液浓缩工艺设计

本研究评估了渗透辅助反渗透（OARO）膜分离在水溶液中铵离子浓缩过程的分离性能。以流量为1000 kg/d，浓度为0.4 wt%的氯化铵水溶液为研究对象，分析了OARO和RO系统的排气压力、膜面积和回流比等主要参数。结果表明，在排气压力大于4.0 MPa、回流比大于7.2、膜面积≥45 m2的条件下，OARO比RO具有更高的分离性能和能效。结果表明，随着OARO中排气压力、膜面积和回流比的增加，浓缩比增加了50倍。值得注意的是，研究表明，在OARO中，无论总膜面积如何，向下游减少膜面积都可以提高浓缩性能，并将其确定为工艺设计的关键参数。

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来源期刊

Separation and Purification Technology 工程技术-工程：化工

CiteScore

14.00

自引率

12.80%

发文量

2347

审稿时长

43 days

期刊介绍： Separation and Purification Technology is a premier journal committed to sharing innovative methods for separation and purification in chemical and environmental engineering, encompassing both homogeneous solutions and heterogeneous mixtures. Our scope includes the separation and/or purification of liquids, vapors, and gases, as well as carbon capture and separation techniques. However, it's important to note that methods solely intended for analytical purposes are not within the scope of the journal. Additionally, disciplines such as soil science, polymer science, and metallurgy fall outside the purview of Separation and Purification Technology. Join us in advancing the field of separation and purification methods for sustainable solutions in chemical and environmental engineering.