Internal circulation electrolysis for ammonia disinhibition in stabilization of sludge autothermal thermophilic aerobic digestion

IF 6.3 2区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of water process engineering Pub Date : 2025-05-13 DOI:10.1016/j.jwpe.2025.107907

Hanlin Liu, Haiping Yuan, Yangyang Liu, Huabo Gong, Nanwen Zhu

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Abstract

Ammonia inhibition poses a significant challenge in autothermal thermophilic aerobic digestion (ATAD), limiting the efficiency of sludge stabilization. This study proposed an innovative strategy integrating internal circulation electrolysis with ATAD to alleviate ammonia accumulation and enhance stabilization of sludge. The optimal electrolytic parameters were determined as a voltage of 6.44 V, electrode distance of 0.79 cm, and reaction time of 55.92 min with response surface methodology (RSM), achieving a total ammonia nitrogen (TAN) removal efficiency of 32.44 % ± 1.31 %. The stabilization time of sludge reduced from 20 days to 8 days when coupling electrolysis with ATAD at a sludge circulation ratio of 7.5: 1 compared with that of conventional ATAD. Mechanistic analysis revealed that the coupling system promoted microbial activity by enriching denitrifying genus (e.g., Luteimonas) and upregulated functional genes associated with nitrogen metabolism (e.g., glnA and gltB), enhancing ammonia assimilation into glutamine pathways. Additionally, reactive oxygen species (ROS) induced from electrolysis facilitated cell lysis and ammonia oxidation, further mitigating inhibition. These findings demonstrate that internal circulation electrolysis could effectively address ammonia inhibition in ATAD process, offering a sustainable solution for rapid sludge stabilization with minimized operational complexity.

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内循环电解氨解抑制污泥自热嗜热好氧消化稳定化

氨抑制对自热嗜热好氧消化（ATAD）提出了重大挑战，限制了污泥稳定的效率。本研究提出了一种将内循环电解与ATAD相结合的创新策略，以减轻氨的积累，提高污泥的稳定性。采用响应面法（RSM）确定最佳电解参数为电压6.44 V、电极距离0.79 cm、反应时间55.92 min，总氨氮（TAN）去除率为32.44%±1.31%。与常规ATAD相比，电解与ATAD耦合，污泥循环比为7.5:1，污泥稳定时间由20天缩短至8天。机制分析表明，该耦合系统通过富集反硝化属（如Luteimonas）和上调氮代谢相关功能基因（如glnA和gltB），促进氨同化进入谷氨酰胺途径，从而促进微生物活性。此外，电解诱导的活性氧（ROS）促进了细胞裂解和氨氧化，进一步减轻了抑制作用。这些研究结果表明，内循环电解可以有效地解决ATAD工艺中的氨抑制问题，为快速稳定污泥提供了一种可持续的解决方案，同时最小化了操作复杂性。

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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