Performance and mechanism of potassium permanganate activation by percarbonate for enhancing short-chain fatty acid production in the anaerobic fermentation of waste-activated sludge

IF 6.3 2区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of water process engineering Pub Date : 2025-07-24 DOI:10.1016/j.jwpe.2025.108192

Zhengjiang Wang , Huilin Luan , Zhenlun Li , Yifan Zeng

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Abstract

Improving the production of short-chain fatty acids (SCFAs) via anaerobic fermentation of waste-activated sludge (WAS) using permanganate (PM) offers a sustainable approach for reducing carbon emissions and enhancing sludge management. However, the practical application of PM is hindered by its relatively low redox potential and its tendency to react with electron-rich compounds. In this study, the feasibility and underlying mechanism of a sodium percarbonate (SPC)–PM coupled strategy for enhancing SCFAs production were investigated. The results showed that SPC–PM treatment significantly increased SCFAs production while simultaneously inhibiting CH₄ formation. In the SPC (0.15 g/g TSS)–PM (0.2 g/g TSS) group, SCFA yield reached 4599.68 mg COD/L, representing increases of 3995 %, 167.98 %, and 118.05 % compared to the control (115.15 mg COD/L), SPC (2738.31 mg COD/L), PM (3896.29 mg COD/L), respectively. The SPC–PM treatment effectively disrupted WAS structure, released more dissolved organic matter for microbial metabolism. ·OH and Mn(III) were identified as the key reactive species facilitating solubilization in the SPC–PM system. Moreover, the treatment enhanced the activity of acetate kinase, α-glucosidase, and protease by 182.86 %, 371.08 %, and 112.55 %, respectively. CH₄ production was significantly suppressed to only 231.77 ppmv. Biochemical analysis revealed that the co-treatment enriched hydrolytic, acidogenic microbial communities and upregulated the expression of genes involved in organic matter hydrolysis, glycolysis, acetic acid metabolism.

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过碳酸盐活化高锰酸钾促进垃圾活性污泥厌氧发酵短链脂肪酸生成的性能及机理

利用高锰酸盐（PM）厌氧发酵废物活性污泥（WAS），提高短链脂肪酸（SCFAs）的产量，为减少碳排放和加强污泥管理提供了一种可持续的方法。然而，PM的实际应用受到其相对较低的氧化还原电位和倾向于与富电子化合物反应的阻碍。在这项研究中，研究了过碳酸钠(SPC) -PM耦合策略提高SCFAs产量的可行性和潜在机制。结果表明，SPC-PM处理显著增加了SCFAs的产生，同时抑制了CH4的形成。在SPC (0.15 g/g TSS) -PM （0.2 g/g TSS）组中，SCFA产率达到4599.68 mg COD/L，比对照（115.15 mg COD/L）、SPC （2738.31 mg COD/L）和PM （3896.29 mg COD/L）分别提高了3995%、167.98%和118.05%。SPC-PM处理有效地破坏了WAS结构，释放出更多的溶解有机物用于微生物代谢。·OH和Mn（III）被确定为在SPC-PM体系中促进增溶的关键反应物质。乙酸激酶、α-葡萄糖苷酶和蛋白酶活性分别提高了182.86%、371.08%和112.55%。CH4产量被显著抑制至231.77 ppmv。生化分析表明，共处理丰富了水解、产酸微生物群落，上调了参与有机物水解、糖酵解、乙酸代谢的基因表达。

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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