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The Effect of Thermochemical Pretreatment on Lignin Breakdown and Biogas Yield from Co-Digested Sawdust and Cowdung

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Abstract:

This study investigates the production of biogas through the co-anaerobic digestion of cow dung and sawdust, utilizing thermochemical pretreatment to enhance lignin breakdown. A 50:50 and a 75:25 mixture of the substrates (Cowdung:sawdust) were subjected to sodium hydroxide pretreatment and thermal conditioning at 80°C. Lignin content reduced from 31.94% to 22.73%. The results demonstrated approximately a 43% increase in biogas yield for both the 50:50 and 75:25 substrate ratios. A four-day earlier gas production onset was recorded for pretreated substrates compared to untreated samples. The methane content of the biogas reached 56% (50:50 ratio) and 60% (75:25 ratio), with hydrogen sulfide at about 1% in both ratios. Process parameters such as pH, and temperature were measured. This study provides a scalable approach for waste-to-energy applications and demonstrates the role of pretreatment in improving substrate digestibility and biogas yield.

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Periodical:

Defect and Diffusion Forum (Volume 447)

Pages:

111-122

DOI:

https://doi.org/10.4028/p-4pOAZv

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Online since:

February 2026

Authors:

Aghogho Mboutidem Obukonise*, Osedome Adokiye Paul Ukwadi

Keywords:

Anaerobic Digestion, Biogas, Cow Dung, Renewable Energy, Sawdust, Thermochemical Pretreatment

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© 2026 Trans Tech Publications Ltd. All Rights Reserved

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