Enhanced electrodialysis by electric double-layer capacitors to minimize membrane use in digestate ammonia recovery: mechanisms and effects

IF 6.3 2区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of water process engineering Pub Date : 2025-05-16 DOI:10.1016/j.jwpe.2025.107920

Qin-Hua Xu, Yaofeng Cai, Jiajie Li, Minglin Zhou, Yanbin Xu

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引用次数: 0

Abstract

Anaerobic digestion technology effectively recovers energy from livestock manure but discharges digestate with high ammonia nitrogen (NH₄⁺-N). NH₄⁺-N in digestate can be effectively recovered by electrodialysis (ED) technology. However, the implementation of ED technology is limited by membrane and energy costs. Here, we present a capacitor-circuit-switching electrodialysis (CCSE) strategy to enhance ED efficiency by integrating an electric double-layer capacitor (EDLC). We reveal that the energy storage mechanism of EDLC improves the power density while the intermittent operation mitigates the concentration polarization effect. In the practice of the real digestate, CCSE elevated the pH to 9.4, and 98.8 % of the NH₄⁺ ions migrated to the cathode compartment after 3.5 h. The specific energy consumption and the current efficiency are 15 kWh/kg NH₄⁺-N (N) and 64.1 %, respectively. High pH contributes to carbon reduction in the stripping process, and subsequent alkaline contamination can be controlled by neutralization of the anode effluent. Moreover, the CCSE-stripping system achieved 95 % NH₄⁺-N removal and 93 % stripping recovery efficiency. This work provides valuable insights and solutions for the design and optimization of ED systems.

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通过双层电电容器增强电渗析，以减少消化氨回收中膜的使用：机制和效果

厌氧消化技术能有效地从畜禽粪便中回收能量，但排出的消化液氨氮含量较高。电渗析（ED）技术可有效回收消化液中的NH4+-N。然而，ED技术的实施受到膜和能源成本的限制。在这里，我们提出了一种电容-电路开关电渗析（CCSE）策略，通过集成电双层电容器（EDLC）来提高电渗析效率。研究发现，EDLC的储能机制提高了功率密度，而间歇运行则减轻了浓度极化效应。在实际消化过程中，CCSE将pH提高到9.4,3.5 h后，98.8%的NH4+离子迁移到阴极室，比能耗为15 kWh/kg NH4+-N (N)，电流效率为64.1%。高pH值有助于汽提过程中的碳还原，随后的碱性污染可以通过阳极出水中和来控制。此外，ccse -汽提系统的NH4+-N去除率达到95%，汽提回收率达到93%。这项工作为ED系统的设计和优化提供了有价值的见解和解决方案。

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来源期刊

Journal of water process engineering Biochemistry, Genetics and Molecular Biology-Biotechnology

CiteScore

10.70

自引率

8.60%

发文量

846

审稿时长

24 days

期刊介绍： The Journal of Water Process Engineering aims to publish refereed, high-quality research papers with significant novelty and impact in all areas of the engineering of water and wastewater processing . Papers on advanced and novel treatment processes and technologies are particularly welcome. The Journal considers papers in areas such as nanotechnology and biotechnology applications in water, novel oxidation and separation processes, membrane processes (except those for desalination) , catalytic processes for the removal of water contaminants, sustainable processes, water reuse and recycling, water use and wastewater minimization, integrated/hybrid technology, process modeling of water treatment and novel treatment processes. Submissions on the subject of adsorbents, including standard measurements of adsorption kinetics and equilibrium will only be considered if there is a genuine case for novelty and contribution, for example highly novel, sustainable adsorbents and their use: papers on activated carbon-type materials derived from natural matter, or surfactant-modified clays and related minerals, would not fulfil this criterion. The Journal particularly welcomes contributions involving environmentally, economically and socially sustainable technology for water treatment, including those which are energy-efficient, with minimal or no chemical consumption, and capable of water recycling and reuse that minimizes the direct disposal of wastewater to the aquatic environment. Papers that describe novel ideas for solving issues related to water quality and availability are also welcome, as are those that show the transfer of techniques from other disciplines. The Journal will consider papers dealing with processes for various water matrices including drinking water (except desalination), domestic, urban and industrial wastewaters, in addition to their residues. It is expected that the journal will be of particular relevance to chemical and process engineers working in the field. The Journal welcomes Full Text papers, Short Communications, State-of-the-Art Reviews and Letters to Editors and Case Studies