Enhancing biogas production from lignocellulosic digestate through priming and post-digestion

Q1 Environmental Science

Bioresource Technology Reports Pub Date : 2025-06-01 DOI:10.1016/j.biteb.2025.102168

Mette Axelsson Bjerg , Fredrik Heino , Sepehr Shakeri Yekta , Luka Šafarič , Alex Enrich Prast , Jan Moestedt , Ebba Perman , Anna Schnürer , Annika Björn

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Abstract

The application of priming, the increase of microbial organic matter turnover by the addition of easily degradable carbon, was investigated for improving biogas production and post-digestion efficiency. Continuously stirred tank main- and post-digesters were operated on manure-based agricultural waste. Potato starch was added as the priming substrate to the post-digester. Addition of 0.2 g VS/L starch every other day increased biogas production from 413 ± 97 to 509 ± 58 mL biogas/day. The increased biogas production exceeds the output from the individual substrates confirming the priming effect. Additionally, the specific biomethane production increased from 74 ± 16 to 116 ± 43 mL/g VS. A shift in microbial community was detected, benefiting lignocellulolytic activities, as degradation of cellulose, hemicellulose and total sugar was enhanced. The results indicate successful application of priming which can improve the overall efficiency of biogas production from manure-based feedstock.

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通过启动和后消化提高木质纤维素消化物的沼气产量

研究了通过添加易降解碳增加微生物有机质周转，以提高沼气产量和后消化效率的应用。以农业废弃物为原料，进行了连续搅拌槽主消化池和后消化池的试验研究。马铃薯淀粉作为起始底物加入后消化池。每隔一天添加0.2 g VS/L淀粉，使沼气产量从413±97 mL /天增加到509±58 mL /天。增加的沼气产量超过了单个基质的产量，证实了启动效应。此外，比生物甲烷产量从74±16 mL/g增加到116±43 mL/g，微生物群落的变化有利于木质纤维素的降解，因为纤维素、半纤维素和总糖的降解增强了。结果表明，在沼液发酵过程中，沼液发酵技术的成功应用，提高了以粪肥为原料生产沼气的整体效率。

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