Enhance the biomethane yield of food waste by anaerobic fermentation

Q1 Environmental Science Bioresource Technology Reports Pub Date : 2024-08-10 DOI:10.1016/j.biteb.2024.101931

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Abstract

This research investigates optimizing food waste (FW) concentrations for enhanced methane production in anaerobic digestion (AD) systems. Various FW concentrations (10, 20, 30, 40, 50, and 100 % v/v) were assessed for their impact on methane yield, pH stability, volatile fatty acid (VFA) levels, and microbial community composition. The study found that FW concentrations up to 20 % v/v maximized methane production, achieving a peak yield of 140.20 mL CH₄/gVS within an ideal pH range of 6.00–7.00. However, higher FW concentrations (>30 % v/v) significantly reduced methane output, with 100 % v/v halting production due to excessive VFA accumulation and pH drops. Key microbial players included acetoclastic methanogens like Methanosaeta and hydrogenotrophic methanogens such as Methanospirillum. These findings emphasize the importance of managing FW concentrations to maintain AD system efficiency, providing valuable insights into sustainable waste management and renewable energy production.

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通过厌氧发酵提高厨余垃圾的生物甲烷产量

本研究调查了优化厨余（FW）浓度以提高厌氧消化（AD）系统甲烷产量的问题。研究评估了各种食物垃圾浓度（10%、20%、30%、40%、50% 和 100% v/v）对甲烷产量、pH 值稳定性、挥发性脂肪酸 (VFA) 含量和微生物群落组成的影响。研究发现，FW 浓度不超过 20% v/v 时，甲烷产量最大，在 6.00-7.00 的理想 pH 值范围内，甲烷产量峰值为 140.20 mL CH4/gVS。然而，较高的 FW 浓度（30 % v/v）会显著降低甲烷产量，100 % v/v 浓度则会因过量的 VFA 积累和 pH 值下降而停止生产。主要的微生物包括醋酸甲烷菌（如 Methanosaeta）和养氢甲烷菌（如 Methanospirillum）。这些发现强调了管理 FW 浓度以保持厌氧消化（AD）系统效率的重要性，为可持续废物管理和可再生能源生产提供了宝贵的见解。

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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