Li, et al (2025) Effect of biocharBiochar is a carbon-rich material created from biomass decomposition in low-oxygen conditions. It has important applications in environmental remediation, soil improvement, agriculture, carbon sequestration, energy storage, and sustainable materials, promoting efficiency and reducing waste in various contexts while addressing climate change challenges. More on anaerobic co-digestion performance of cellulosic ethanol refinery waste liquor with swine manure. https://doi.org/10.1016/j.jwpe.2024.106574

Researchers have explored using biochar to improve anaerobic co-digestion (AcoD) of cellulosic ethanol refinery waste liquor (WL) and swine manure (SM), offering a sustainable solution for waste recycling in biofuel production. This study, published in the Journal of Water Process Engineering, examines how biochar derived from refinery waste residue (WR) can enhance methane yield and stabilize digestion systems.

The team tested WL and SM mixtures under mesophilic conditions, optimizing ratios to achieve maximum methane output. Mixing WL and SM at a 75:25 ratio produced a cumulative methane yield (CMY) of 225.48 mL/g VS, a 14% improvement over mono-digestion. Adding biochar pyrolyzed at 400°C (BC400) further boosted CMY to 255.67 mL/g VS, a 15.25% increase compared to controls.

Biochar’s effectiveness stems from its porous structure and oxygen-containing functional groups, which promote microbial activity and enhance direct interspecies electron transfer (DIET). High-throughput sequencing confirmed that BC400 enriched hydrolytic, acidogenic, and methanogenic microbial communities, accelerating waste decomposition and methane production.

This research demonstrates a dual benefit: improving biofuel refinery efficiency while recycling its byproducts. Using WR-derived biochar not only reduces waste management costs but also decreases carbon emissions by minimizing the need for external additives. These findings provide a practical framework for integrating waste recycling into cellulosic ethanol production, advancing the industry’s economic and environmental sustainability.