New approach to agro-industrial solid and liquid waste management: Performance of an EGSB reactor at different hydraulic retention times for methane production

IF 9 1区工程技术 Q1 ENERGY & FUELS

Renewable Energy Pub Date : 2024-11-05 DOI:10.1016/j.renene.2024.121822

Caroline Varella Rodrigues , Leonardo Matias de Oliveira Filho , Franciele Pereira Camargo , Henrique de Souza Dornelles , Isabel Kimiko Sakamoto , Sandra Imaculada Maintinguer , Edson Luiz Silva , Maria Bernadete Amâncio Varesche

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Abstract

This study investigated the removal of agro-industrial wastes (5 g COD L⁻¹ from coffee and 0.5 g COD L⁻¹ from brewery wastewater, plus 1 g L⁻¹ of coffee pulp and husk) in a continuous Expanded Granular Sludge Bed (EGSB) reactor at 35 °C. The effect of Hydraulic Retention Times (HRTs) of 72h, 48h, and 24h on CH₄ yield was examined using a mixed culture of cattle manure and granular sludge. Methane yields were 201, 124.5, and 113.8 mL CH₄ g⁻¹ COD for the 1st, 2nd, and 3rd phases, respectively. Volatile fatty acids, particularly acetic acid, increased at lower HRTs. Sequencing of the 16S rRNA gene on the Illumina HiSeq platform revealed a syntrophic relationship between Syntrophorhabdus, Syntrophobacter, and Pseudomonas with methanogens Methanomassiliicoccus, Methanospirillum, and Methanobacterium, aiding in the removal of phenolic compounds. The study suggests that an HRT of 72h is optimal for maximizing CH₄ production in the EGSB reactor.

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农用工业固体和液体废物管理的新方法：不同水力停留时间下 EGSB 反应器生产甲烷的性能

本研究调查了在 35 °C、连续式膨胀颗粒污泥床（EGSB）反应器中去除农工业废物（5 g COD L-1 来自咖啡，0.5 g COD L-1 来自酿酒厂废水，外加 1 g L-1 的咖啡浆和咖啡壳）的情况。使用牛粪和颗粒污泥混合培养，考察了 72 小时、48 小时和 24 小时水力停留时间（HRT）对甲烷产量的影响。第一、第二和第三阶段的甲烷产量分别为 201、124.5 和 113.8 mL CH₄ g-1 COD。挥发性脂肪酸，尤其是乙酸，在较低的 HRTs 条件下有所增加。在 Illumina HiSeq 平台上对 16S rRNA 基因进行测序后发现，Syntrophorhabdus、Syntrophobacter 和假单胞菌与甲烷菌 Methanomassiliicoccus、Methanospirillum 和 Methanobacterium 之间存在合成营养关系，有助于酚类化合物的去除。研究表明，72 小时的 HRT 是使 EGSB 反应器中 CH₄ 产量最大化的最佳时间。

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来源期刊

Renewable Energy 工程技术-能源与燃料

CiteScore

18.40

自引率

9.20%

发文量

1955

审稿时长

6.6 months

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