环境工程学报2025，Vol.19Issue(8)：1807-1816,10.DOI:10.12030/j.cjee.202410120
微生物电解池耦合纳米磁铁矿对养猪废水与稻秆混合厌氧消化的影响
Effect of microbial electrolysis cell coupled with nano-magnetite on anaerobic co-digestion of piggery wastewater and rice straw
摘要
Abstract
The anaerobic co-digestion of piggery wastewater and rice straw holds dual value for resource utilization and environmental protection.However,traditional anaerobic digestion(AD)faces challenges such as low organic degradation efficiency,poor system stability,and low methane production.To enhance methane yield,this study investigated the individual and combined effects of nano-magnetite(50 mg·g-1,based on total solids)and a microbial electrolytic cell(MEC,applied voltage 0.6 V)on anaerobic digestion.Results showed that both MEC and nano-magnetite significantly improved methane production and gas generation rates.After 45 days of digestion,the cumulative methane yields in the nano-magnetite-amended AD(M-AD)and MEC-assisted AD(MEC-AD)systems increased by 29.2％and 13.7％,respectively,compared to the control(AD).The coupling of nano-magnetite and MEC(M-MEC-AD)exhibited a synergistic effect,achieving the highest cumulative methane yield-4.3％and 18.6％higher than M-AD and MEC-AD,respectively.Gompertz model fitting indicated that the combined approach shortened the methane production lag phase and significantly boosted methane yield.Both nano-magnetite and MEC increased the iron ion concentration in the fermentation broth,enhancing microbial activity and promoting organic hydrolysis.The rice straw degradation rate in M-MEC-AD reached 70.5％,surpassing those of M-AD(66.8％)and MEC-AD(65.4％).Individually or combined,nano-magnetite and MEC facilitated interspecies electron transfer,accelerating the conversion of propionate and butyrate to acetate,while also reducing free ammonia nitrogen(FAN)concentration,thereby improving system stability.Correlation analysis identified Fe2+as a key factor influencing cumulative methane production.These findings provide theoretical insights for optimizing agricultural waste valorization and MEC-AD processes.关键词
养猪废水/厌氧消化/微生物电解池/纳米磁铁矿Key words
piggery wastewater/anaerobic digestion/microbial electrolytic cell/nano-magnetite分类
资源环境引用本文复制引用
陈钱,潘云霞..微生物电解池耦合纳米磁铁矿对养猪废水与稻秆混合厌氧消化的影响[J].环境工程学报,2025,19(8):1807-1816,10.基金项目
重庆市社会民生科技创新专项项目(cstc2016shmszx80114) （cstc2016shmszx80114）
