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Enhanced high-quality biomethane production from anaerobic digestion of primary sludge by corn stover biochar
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Researchers showed that adding corn stover biochar to anaerobic digesters processing primary sewage sludge increased methane content from 67.5% to up to 87.3%, enhanced methane yields by up to 18%, and reduced digestate volume by 15% over a 116-day continuous trial — demonstrating biochar as a practical tool for improving both energy recovery and sludge reduction in wastewater treatment.
This study conducted batch and continuous tests to reveal the feasibility of corn stover biochar on improving anaerobic digestion of primary sludge (PS). Dosing biochar (1.82, 2.55 and 3.06 g/g Total Solids (TS)) in digester improved methane content increasing from 67.5% to 81.3-87.3% and enhanced methane production by 8.6-17.8%. Model analysis indicated that biochar accelerated PS hydrolysis and enhanced methane potential of PS. The mechanistic studies showed that biochar enhanced process stability provided by strong buffering capacity and alleviated NH inhibition. In continuous test over 116 days, the volatile solids (VS) destruction in the biochar-dosed digester increased by 14.9%, resulting in a 14% reduction in the volume of digestate for disposal. Biochar changed microbial community in an expected direction for anaerobic digestion. This work suggests that biochar technology would apply to co-digestion of WAS and PS to maximize the energy recovery and sludge reduction from the two sludge streams.
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Researchers found that biochar addition effectively mitigated the inhibitory effects of polyethylene nanoplastics on anaerobic granular sludge, restoring methane production by reducing oxidative stress and improving microbial community stability.
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Researchers found that combining biochar with Methanosarcina thermophila bioaugmentation improved methane yields in thermophilic anaerobic digestion of food waste, while polypropylene microplastics used as a comparison growth support showed different performance, highlighting biochar as a promising additive for optimizing digestion systems.
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This study found that adding cotton stalk biochar to sewage sludge during composting simultaneously reduced heavy metal availability by up to 81% and increased microplastic degradation by up to 58%. The biochar worked by promoting beneficial microorganisms and creating conditions that break down plastic particles, offering a practical strategy for treating two common pollutants in sewage that can otherwise end up in agricultural soil and the food chain.
Biochar amendment to advance contaminant removal in anaerobic digestion of organic solid wastes: A review
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This review examined how biochar amendment improves anaerobic digestion of organic solid wastes by enhancing biodegradation, reducing inhibitory substances, and facilitating removal of contaminants such as antibiotics, heavy metals, microplastics, and PAHs, proposing mechanisms by which biochar's porous and conductive properties drive these benefits.
Synergistic effects of biochar derived from different sources on greenhouse gas emissions and microplastics mitigation during sewage sludge composting
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Researchers found that biochar from different sources (wheat straw, sawdust, pig manure) added during sewage sludge composting significantly reduced greenhouse gas emissions and microplastic abundance, with sawdust biochar showing the most effective mitigation of global warming potential.
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When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.