The insufficient oxygen supply in partial materials commonly results in significant greenhouse gas emissions during composting, which is essentially attributed to the poor electron transfer in the composting systems. Electric field-assisted aerobic composting (EAC) is considered effective in mitigation of greenhouse gas emissions, but the poor conductivity of composting materials hampers its efficiency and applicability. In this study, conductive biochar was added in the EAC system to investigate its effects on the performance and greenhouse gas emissions during the composting processes. In the system of EAC with biochar, the electrochemical properties, O₂ utilization and composting performance were improved compared to the systems without biochar or assisted electric field. The maximum current of EAC with biochar was 0.32 A, higher than that without biochar (0.28A). Particularly, the peak concentrations of CH₄ and N₂O in the EAC system with biochar were 0.86 mg·kg⁻¹ and 1.43 mg·kg⁻¹, which were 45 % and 27 % lower than those in the EAC without biochar, respectively. The direct global warming potential attributed to CO₂, CH₄, and N₂O was 3.96 g CO₂-equivalent·kg⁻¹ dry mass, providing a 31.6 % reduction compared to conventional composting. Microbial analyses revealed that biochar increased the relative abundance of electroactive bacteria including Bacillus, Tepidimicrobium and Corynebacterium. In contrast, the abundances of potential nitrifying and denitrifying bacterial species of Pseudomonas, Corynebacterium, Acinetobacter, and Bacillus were significantly lowered in the biochar-assisted EAC system (11.35 %). The results showed that the addition of biochar was able to promote the electrical conductivity of composting materials and accelerate the organic oxidation process by increasing O₂ consumption, and accordingly change the dominant microbial community on both composting and biochar particles. This study verified the mechanism of the effectiveness of biochar in greenhouse gas control in composting processes, and thus provided evidence for facilitating the sustainable development of composting technologies.

部分材料中氧气供应不足通常会导致堆肥过程中大量温室气体排放，这主要归因于堆肥系统中电子传递不良。电场辅助好氧堆肥（EAC）被认为可有效减少温室气体排放，但堆肥材料的导电性差阻碍了其效率和适用性。在这项研究中，在 EAC 系统中添加了导电生物炭，以研究其对堆肥过程中性能和温室气体排放的影响。在EAC与生物炭的体系中，电化学性质，O ₂与没有生物炭或辅助电场的系统相比，利用率和堆肥性能有所提高。加入生物炭的EAC的最大电流为0.32 A，高于未加入生物炭的（0.28A）。_{特别是加入生物炭的EAC体系中CH 4}和N ₂ O的峰值浓度分别为0.86 mg·kg ^-1和1.43 mg·kg ^-1，分别比没有加入生物炭的EAC降低了45 %和27 %。 . 归因于 CO ₂、CH ₄和 N ₂ O 的直接全球变暖潜势为 3.96 g CO ₂ -当量·kg ^-1干重，与传统堆肥相比减少了 31.6%。微生物分析表明，生物炭增加了电活性细菌的相对丰度，包括芽孢杆菌属、Tepidimicrobium和棒状杆菌属。相比之下，在生物炭辅助的 EAC 系统中，潜在的硝化和反硝化细菌种类的假单胞菌、棒状杆菌、不动杆菌和芽孢杆菌的丰度显着降低 (11.35 %)。结果表明，生物炭的添加能够促进堆肥材料的导电性，并通过增加O _{2来加速有机物的氧化过程。}消耗，并相应地改变堆肥和生物炭颗粒上的主要微生物群落。本研究验证了生物炭在堆肥过程中控制温室气体的有效性机制，从而为促进堆肥技术的可持续发展提供了依据。