Enhancement of anaerobic digestion of dairy wastewater by addition of conductive materials with or without the combination of external voltage application

IF 2.8 4区生物学 Q3 BIOTECHNOLOGY & APPLIED MICROBIOLOGY

Journal of chemical technology and biotechnology Pub Date : 2024-05-29 DOI:10.1002/jctb.7685

Michail S Fountoulakis, Zuzana Frkova, Sébastien Lemaigre, Xavier Goux, Magdalena Calusinska, Jimmy Roussel

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Abstract

BACKGROUND

The addition of conductive materials or the application of external voltage is a promising novel methodology to enhance methane production in anaerobic digesters. However, there is limited knowledge about their individual or combined effects on the anaerobic digestion of dairy wastewater. The aim of this study was to examine the effects of granular activated carbon (GAC) or magnetite addition and external voltage application, both individually and in combination, for the anaerobic digestion of real, undiluted dairy wastewater.

RESULTS

The results showed that the estimated maximum methane production rate increased significantly (P < 0.05) from 143 ± 8 mL gVS_added⁻¹ day⁻¹ in the control reactors to 163 ± 11 mL gVS_added⁻¹ day⁻¹ and 166 ± 11 mL gVS_added⁻¹ day⁻¹ in the reactors containing GAC, with or without the combination of external voltage, respectively. The addition of GAC, in both cases, resulted in higher consumption rate of acetate, indicating a promotion of the methanogenesis step. By contrast, the application of external voltage or the addition of magnetite had no significant effect on either methane production rate nor methane yield. Moreover, the analysis of the microbial community showed that the addition of GAC resulted in the enrichment of Desulfobacterota, Methanosarcina, Candidatus Methanofastidiosum and Methanolinea.

CONCLUSION

Overall, GAC addition seems a promising strategy to increase methane production in anaerobic digesters treating dairy wastewater. © 2024 The Author(s). Journal of Chemical Technology and Biotechnology published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry (SCI).

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通过添加导电材料并结合或不结合外加电压，提高乳制品废水的厌氧消化能力

背景添加导电材料或施加外部电压是一种很有前途的新方法，可提高厌氧消化器中的甲烷产量。然而，人们对它们对乳制品废水厌氧消化的单独或综合影响了解有限。本研究的目的是考察颗粒活性炭（GAC）或磁铁矿的添加以及外加电压单独或联合应用对真实未稀释乳制品废水厌氧消化的影响。结果结果表明，在含有 GAC 的反应器中，无论是否结合使用外加电压，估计的最大甲烷生产率都从对照组的 143 ± 8 mL gVSadded-1 天-1 显著增加到 163 ± 11 mL gVSadded-1 天-1 和 166 ± 11 mL gVSadded-1 天-1（P < 0.05）。在这两种情况下，添加 GAC 都会导致醋酸消耗率升高，这表明甲烷生成步骤得到了促进。相比之下，施加外部电压或添加磁铁矿对甲烷产生率和甲烷产量都没有显著影响。此外，对微生物群落的分析表明，添加 GAC 后，脱硫菌群、Methanosarcina、Candidatus Methanofastidiosum 和 Methanolinea 的数量增加。© 2024 作者。化学技术与生物技术期刊》由约翰威利与桑斯有限公司代表化学工业学会（SCI）出版。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of chemical technology and biotechnology 工程技术-工程：化工

CiteScore

7.00

自引率

5.90%

发文量

268

审稿时长

1.7 months

期刊介绍： Journal of Chemical Technology and Biotechnology(JCTB) is an international, inter-disciplinary peer-reviewed journal concerned with the application of scientific discoveries and advancements in chemical and biological technology that aim towards economically and environmentally sustainable industrial processes.