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Microbial mechanism for improving biogas production performance from boiling acidified pig manure feedstock
Bioresource Technology ( IF 9.7 ) Pub Date : 2025-01-22 , DOI: 10.1016/j.biortech.2025.132104
Ming Wang, Kai Liu, Qichen Li, Yunting Li, Hao Peng, Qingjie Wang, Manman Wang, Wenzhe Li
Bioresource Technology ( IF 9.7 ) Pub Date : 2025-01-22 , DOI: 10.1016/j.biortech.2025.132104
Ming Wang, Kai Liu, Qichen Li, Yunting Li, Hao Peng, Qingjie Wang, Manman Wang, Wenzhe Li
A short heat treatment (HT, 90 °C–100 °C, 5 min) was applied to two-phase anaerobic digestion (TPAD) of pig manure (PM) to investigate its effect on microbial inactivation in the acidified feedstock during the methanogenic phase. The results showed that no differences in biogas production at organic loading rate (OLR) below 4.28 g volatile solid (VS)/(L·d). However, as the organic load increased, the TPAD with HT exhibited greater biogas production and volatile organic acids removal than the control. By stabilizing pH, digestion of HT acidified feedstock at 9.56 g VS/(L·d) OLR resulted in a biogas yield of 340.1 mL/g VS, exceeding the control by 35.6 %. HT enriched syntrophic bacteria, Methanothrix and Methanobacterium methanogens, and one-carbon metabolizing genes in the methanogenic phase, enhancing energy storage and conversion. Accordingly, acidification followed by HT could be a potential method to improve microbial community and load tolerance in methanogenic phase of TPAD.
中文翻译:
提高煮沸酸化猪粪原料沼气生产性能的微生物机制
对猪粪 (PM) 的两阶段厌氧消化 (TPAD) 进行短热处理 (HT,90 °C–100 °C,5 min),以研究其对产甲烷阶段酸化原料中微生物灭活的影响。结果表明,在有机负荷率 (OLR) 低于 4.28 g 挥发性固体 (VS)/(L·d) 时,沼气产量无差异。然而,随着有机负荷的增加,含 HT 的 TPAD 表现出比对照更高的沼气产量和挥发性有机酸的去除。通过稳定 pH 值,在 9.56 g VS/(L·d) OLR 下消化 HT 酸化原料,沼气产量为 340.1 mL/g VS,比对照高出 35.6 %。HT 富含同养细菌、甲烷螺菌和产甲烷杆菌,以及产甲烷阶段的一碳代谢基因,增强能量储存和转化。因此,酸化后进行 HT 可能是改善 TPAD 产甲烷期微生物群落和负荷耐受性的潜在方法。
更新日期:2025-01-22
中文翻译:
提高煮沸酸化猪粪原料沼气生产性能的微生物机制
对猪粪 (PM) 的两阶段厌氧消化 (TPAD) 进行短热处理 (HT,90 °C–100 °C,5 min),以研究其对产甲烷阶段酸化原料中微生物灭活的影响。结果表明,在有机负荷率 (OLR) 低于 4.28 g 挥发性固体 (VS)/(L·d) 时,沼气产量无差异。然而,随着有机负荷的增加,含 HT 的 TPAD 表现出比对照更高的沼气产量和挥发性有机酸的去除。通过稳定 pH 值,在 9.56 g VS/(L·d) OLR 下消化 HT 酸化原料,沼气产量为 340.1 mL/g VS,比对照高出 35.6 %。HT 富含同养细菌、甲烷螺菌和产甲烷杆菌,以及产甲烷阶段的一碳代谢基因,增强能量储存和转化。因此,酸化后进行 HT 可能是改善 TPAD 产甲烷期微生物群落和负荷耐受性的潜在方法。