A novel magnetic adsorption and capacitive deionization coupled technology for industrial saline wastewater recycling

IF 11.4 1区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL

Water Research Pub Date : 2025-03-26 DOI:10.1016/j.watres.2025.123559

Shuo Wang , Hongjie Wang , Xinyuan Huang , Zefeng Wu , Hongyang Xue , Chunxia Zhao

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Abstract

The cost-effective desalination technologies were urgent needed to recycle industrial saline wastewater, desalinate seawater and brackish water. Deionisation techniques based on the adsorption principle usually suffer from low adsorption capacity of the adsorbent, susceptibility to contamination, regeneration difficulties and secondary contamination. In this paper, the magnetic reduced graphene oxide (mrGO) was successfully prepared as magnetic media, and a novel magnetic adsorption deionization and capacitive deionization coupled system (MDI-CDI) was constructed, in which a superposition magnetic field with consistent direction was formed by the internal additional magnetic field of magnetic media and the external magnetic field. The relationship between various salt solutions, initial concentration, operation patterner and deionization effect were investigated by KCl solution to optimize the MDI system. The actual petrochemical circulating wastewater (0.933 mS/cm), were adopted to investigate the magneto-electric coupling effect of MDI-CDI system, the average desalination rate and COD removal were 96.9 % and 84.8 %, respectively. In addition, the three-stage tandem MDI system was adopted to investigate the enhanced magnetic adsorption deionization effect, which was 79.3 % of catalytic cracking wastewater (37.4 mS/cm) and 84.0 % of petrochemical wastewater (3.68 mS/cm), respectively. The results indicate that the main deionization mechanisms of MDI system were enhanced by a superimposed magnetic field, including physical adsorption, magnetic attraction, electrostatic attraction, and surface complexation/deposition effects. The MDI-CDI coupled deionisation system can mitigate membrane contamination, regenerate online without secondary pollution under low-consumption, high-efficiency and stable state, providing a new technological idea for the regeneration and utilization of saline wastewater.

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用于工业含盐废水回收的新型磁吸附和电容去离子耦合技术

回收利用工业含盐废水、淡化海水和苦咸水迫切需要具有成本效益的海水淡化技术。基于吸附原理的去离子技术通常存在吸附剂吸附能力低、易受污染、再生困难和二次污染等问题。本文成功制备了磁性还原氧化石墨烯（mrGO）作为磁性介质，并构建了一种新型的磁性吸附去离子和电容去离子耦合系统（MDI-CDI），其中磁性介质的内部附加磁场和外部磁场形成了方向一致的叠加磁场。通过 KCl 溶液研究了各种盐溶液、初始浓度、运行模式和去离子效果之间的关系，以优化 MDI 系统。采用实际石油化工循环废水（0.933 mS/cm）研究了 MDI-CDI 系统的磁电耦合效应，其平均脱盐率和 COD 去除率分别为 96.9% 和 84.8%。此外，采用三级串联 MDI 系统考察了增强磁吸附去离子效果，催化裂化废水（37.4 mS/cm）和石油化工废水（3.68 mS/cm）的去离子率分别为 79.3%和 84.0%。结果表明，叠加磁场增强了 MDI 系统的主要去离子机理，包括物理吸附、磁吸引、静电吸引和表面络合/沉积效应。MDI-CDI耦合去离子系统能缓解膜污染，在低耗、高效、稳定的状态下在线再生，不产生二次污染，为含盐废水的再生利用提供了一种新的技术思路。

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来源期刊

Water Research 环境科学-工程：环境

CiteScore

20.80

自引率

9.40%

发文量

1307

审稿时长

38 days

期刊介绍： Water Research, along with its open access companion journal Water Research X, serves as a platform for publishing original research papers covering various aspects of the science and technology related to the anthropogenic water cycle, water quality, and its management worldwide. The audience targeted by the journal comprises biologists, chemical engineers, chemists, civil engineers, environmental engineers, limnologists, and microbiologists. The scope of the journal include: •Treatment processes for water and wastewaters (municipal, agricultural, industrial, and on-site treatment), including resource recovery and residuals management; •Urban hydrology including sewer systems, stormwater management, and green infrastructure; •Drinking water treatment and distribution; •Potable and non-potable water reuse; •Sanitation, public health, and risk assessment; •Anaerobic digestion, solid and hazardous waste management, including source characterization and the effects and control of leachates and gaseous emissions; •Contaminants (chemical, microbial, anthropogenic particles such as nanoparticles or microplastics) and related water quality sensing, monitoring, fate, and assessment; •Anthropogenic impacts on inland, tidal, coastal and urban waters, focusing on surface and ground waters, and point and non-point sources of pollution; •Environmental restoration, linked to surface water, groundwater and groundwater remediation; •Analysis of the interfaces between sediments and water, and between water and atmosphere, focusing specifically on anthropogenic impacts; •Mathematical modelling, systems analysis, machine learning, and beneficial use of big data related to the anthropogenic water cycle; •Socio-economic, policy, and regulations studies.