Production of biochar from crop residues and its application for anaerobic digestion
Résumé
Anaerobic digestion is a viable and cost-effective method for converting organic waste into renewable energy. The efficiency of organic waste digestion, nonetheless, is limited due to inhibition and instability. Accordingly, biochar is an effective method for improving the efficiency of anaerobic digestion by adsorbing inhibitors, promoting biogas generation and methane concentration, maintaining process stability, colonizing microorganisms selectively, and mitigating the inhibition of digestion by volatile fatty acids and ammonia. Here we review crop waste-derived biochar and applications in anaerobic digestion systems. Four critical roles of biochar were identified: maintaining pH stability, promoting hydrolysis, enhancing the direct interspecies electron transfer pathway, and supporting microbial development. The interaction between biochar dose, amount of organic component in the substrate, and inoculum-to-substrate ratio should be the focus of future research before deploying commercial applications.
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