氮掺杂芦荟碳和磁场对厌氧共发酵系统产甲烷的协同作用

SYNERGISTIC EFFECT OF ALOE PEEL-DERIVED NITROGEN-DOPED BIO-BASED CARBON AND MAGNETIC FIELD ON METHANE PRODUCTION IN ANAEROBIC CO-DIGESTION

采用氮掺杂芦荟碳(N-C)作为厌氧共发酵的添加剂,研究其和磁场的协同作用对厌氧共发酵系统的甲烷产量、总化学需氧量(TCOD)去除率、pH值、总固体(TS)和挥发性固体(VS)去除率的影响。结果表明:与对照组CK相比,添加N-C可使发酵系统的产气高峰提前、沼气产量增加。给发酵系统施加5 mT的磁场,添加N-C可进一步提升共发酵系统性能。N-C添加剂和磁场协同作用可使产沼气高峰比CK组提前2~3 d,累计沼气产量提高48.4%~101.6%。质量分数为0.30%N-C的添加量使发酵系统获得最高的沼气产量(537.6 mL/g VS)、最高的甲烷含量(59.3%)和甲烷产量(318.8 mL/g VS)、最高的TCOD去除率(79.02%)、最高的TS去除率(44.1%)和VS去除率(55.7%)。最后,解释N-C作为添加剂和磁场在增强厌氧共发酵甲烷产量的协同作用。

In this study,aloe peel-derived nitrogen-doped bio-based carbon(N-C)was used as an additive in an anaerobic co-digestion system to investigate the synergistic effect of N-C and a magnetic field on methane production,pH value,and the removal rates of total chemical oxygen demand(TCOD),total solids(TS),and volatile solids(VS).The results show that,compared with the control group,the addition of N-C can improve the gas production peak of the digestion system and increase biogas production.Applying a magnetic field of 5 mT to the digestion system and adding N-C can further improve the performance of the co-digestion system.The synergistic effect of the N-C additive and a magnetic field results in a biogas production peak 2-3 days earlier than that of the CK group,and the cumulative biogas production increases by 48.40%-101.6%.The addition of 0.30%N-C enable the digestion system to obtain the highest biogas production(537.6 mL/g VS),methane content(59.3%),methane production(318.8 mL/g VS),and removal rate of TCOD(79.02%),TS(44.1%)and VS(55.7%).This paper explains the synergistic effect of N-C as an additive and a magnetic field in enhancing methane production in anaerobic co-digestion.