The influence of biochar pyrolysis temperature on anaerobic digestion of chicken litter in a leach bed coupled to a biochar filter

Q1 Environmental Science

Bioresource Technology Reports Pub Date : 2025-08-19 DOI:10.1016/j.biteb.2025.102219

Ben A. Collins , Cristian H. Birzer , Stephen P. Kidd , Tony Hall , Paul R. Medwell

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Abstract

Recent studies have shown that a dry anaerobic digestion system known as a leach bed reactor (LBR) is suitable for processing chicken litter — an abundant and problematic waste from broiler farming — and that biochar can enhance the process. The influence of biochar addition in anaerobic digestion technologies varies depending on biochar properties. This study considers the influence of wood biochar produced at different pyrolysis temperatures (450 to 900 °C) on anaerobic digestion of chicken litter in an LBR coupled to a biochar-packed anaerobic filter. The pyrolysis temperature of biochar applied as filter media did not significantly influence methane production rate and yield. However, hydrogen sulfide yield declined with decreasing biochar pyrolysis temperature. Application of 450 °C biochar reduced hydrogen sulfide yield by 30, 36 and 53% compared to biochars produced at 600, 750 and 900 °C, respectively. The presence of organic surface functional groups and capability to form liquid films on the surface of biochar are likely more important than surface area for enhancing hydrogen sulfide reduction.

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生物炭热解温度对耦合生物炭滤池中鸡粪厌氧消化的影响

最近的研究表明，一种被称为浸出床反应器（LBR）的干式厌氧消化系统适合处理鸡粪——肉鸡养殖中大量有问题的废物——而生物炭可以增强这一过程。生物炭添加对厌氧消化技术的影响取决于生物炭的性质。本研究研究了不同热解温度（450 ~ 900℃）下产生的木质生物炭对LBR -生物炭填料厌氧过滤器厌氧消化鸡粪的影响。生物炭作为过滤介质的热解温度对甲烷产率和产率影响不显著。硫化氢产率随热解温度的降低而降低。与600°C、750°C和900°C的生物炭相比，450°C生物炭的硫化氢产率分别降低了30%、36%和53%。有机表面官能团的存在和在生物炭表面形成液体膜的能力可能比表面积对增强硫化氢还原更重要。

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