Pilot-scale study of CO2 enrichment effects on anaerobic digestion performance

IF 4.1 2区工程技术 Q2 ENGINEERING, CHEMICAL Chemical Engineering Science Pub Date : 2025-02-01 DOI:10.1016/j.ces.2024.121070

Lucie Castel , Guillaume Cazaudehore , Jean-Baptiste Beigbeder , Rémy Guyoneaud , Christine Peyrelasse

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Abstract

Recent studies on anaerobic digestion (AD) off-gas valorization have explored ways to enhance biological methane production by enriching the digestate with carbon dioxide (CO₂). This approach aims to increase AD profitability by biological conversion of CO₂ to methane (CH₄). However, existing research lacks consensus on the effectiveness of CO₂ injection, with the underlying biological mechanisms remaining poorly understood.

This study investigates the impact of CO₂ injection on AD in a pilot-scale setup using standard on-farm feedstocks. Two pilot-scale reactors were operated in parallel: one serving as a control, and the other featuring CO₂ injection through a bubble column with digestate recirculation. Results showed no demonstrable improvement in biomethane yields from CO₂ enrichment. In fact, a high-rate CO₂ injection had a detrimental effect on methane production.

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CO2富集对厌氧消化性能影响的中试研究

近年来对厌氧消化（AD）废气增值的研究探索了通过向消化池中富集二氧化碳（CO2）来提高生物甲烷产量的方法。该方法旨在通过将二氧化碳生物转化为甲烷（CH4）来提高AD的盈利能力。然而，现有的研究对二氧化碳注射的有效性缺乏共识，其潜在的生物学机制仍然知之甚少。本研究在使用标准农场原料的中试装置中调查了二氧化碳注入对AD的影响。两个中试反应器平行运行：一个作为控制，另一个通过带消化液再循环的气泡塔注入二氧化碳。结果表明，CO2富集对生物甲烷产量没有明显的改善。事实上，高速率的二氧化碳注入对甲烷产量有不利影响。

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

Chemical Engineering Science 工程技术-工程：化工

CiteScore

7.50

自引率

8.50%

发文量

1025

审稿时长

50 days

期刊介绍： Chemical engineering enables the transformation of natural resources and energy into useful products for society. It draws on and applies natural sciences, mathematics and economics, and has developed fundamental engineering science that underpins the discipline. Chemical Engineering Science (CES) has been publishing papers on the fundamentals of chemical engineering since 1951. CES is the platform where the most significant advances in the discipline have ever since been published. Chemical Engineering Science has accompanied and sustained chemical engineering through its development into the vibrant and broad scientific discipline it is today.