摘要
直接种间电子传递(DIET)对扩散传质依赖低、电子传递速率快,可取代间接种间电子传递,成为城镇有机固废(主要包括餐厨垃圾和剩余污泥)厌氧消化的核心机制。然而,厌氧消化后残留的副产物沼渣对环境危害大,一直是实现“无废城市”建设目标的挑战。本研究以含铁沼渣为原料,探究了在不同碳化温度下制备的含铁沼渣基生物炭的形貌结构特征及其对城镇有机固废厌氧消化性能的影响,旨在实现“以废治废”。研究结果表明,随着碳化温度的升高,含铁沼渣基生物炭的孔隙结构增多,官能团组成简化,在800℃碳化条件下制备的含铁沼渣基生物炭,具有更丰富的孔隙和更高的铁含量。在厌氧消化实验中,添加800℃下制备的含铁沼渣基生物炭组的甲烷累积产量为184.24 mL/g挥发性固体(VS),比沼渣(.未添加含铁沼渣基生物炭)提高了19.78%;添加800℃下制备的含铁沼渣基生物炭组的VS去除率达到45.75%,比沼渣提高了6.73%。此外,添加500℃下制备的含铁沼渣基生物炭组相较于沼渣,甲烷累积产量提高了15.66%,VS去除率提高了5.79%,其他实验组的提升效果不显著。电化学分析结果表明,添加800℃下制备的含铁沼渣基生物炭组污泥具有更大的电容性和更低的电阻,表明污泥内部种间电子传递得到增强。此外,含铁沼渣基生物炭提高了Methanosaeta和Fastidiosipila的相对丰度,促进了它们之间的DIET,进而提高了城镇有机固废厌氧消化的性能。
Direct interspecies electron transfer(DIET)offers a faster electron transfer rate and a reduced dependence on diffusive mass transfer,potentially becoming a primary mechanism for the anaerobic digestion of urban organic solid wastes,such as food waste and excess sludge.However,digestate,the byproduct of anaerobic digestion,poses environmental hazards and hinders the achievement of a waste-free city.This study investigates the morphological and structural characteristics of iron-containing digestate-based biochar(Fe-BC)produced at various carbonization temperatures,and its impact on the anaerobic digestion of urban organic solid wastes,with the goal of achieving"waste-to-value-added products".The results showed that increasing the carbonization temperature led to a more developed pore structure in the Fe-BC,but reduced the complexity of its functional group composition.Fe-BC prepared at 800℃exhibited the most developed pore structure and the highest iron content,with more uniform iron distribution throughout the biochar.In anaerobic digestion experiments,the group with biochar prepared at 800℃ demonstrated a cumulative methane yield of 184.24 mL/g volatile solids(VS),a 19.78%increase compared to the control group(without biochar).The VS removal rate reached 45.75%,a 6.73% increase over the control group.The group with biochar prepared at 500℃ showed a 15.66%increase in cumulative methane yield and a 5.79%increase in the VS removal rate,while the other experimental groups showed no significant improvement.The effect of Fe-BC on promoting methane production was most pronounced in the middle of the experiment,peaking on the ninth day.Furthermore,Fe-BC prepared at 800℃improved both the methane content and the quality of the biogas produced.Electrochemical analysis indicated that the sludge in the Fe-BC group prepared at 800℃ exhibited greater capacitance and lower electrical resistance,suggesting enhanced interspecies electron transfer,microbial electron exchange,and electrical conductivity.Additionally,Fe-BC increased the relative abundance of Methanosaeta and.Fastidiosipila.In conclusion,Fe-BC derived from digestate possesses a well-developed pore structure,with Fe-BC prepared at 800℃ exhibiting the most developed porosity.The addition of Fe-BC prepared at 800℃was the most effective in promoting the anaerobic digestion of urban organic solid wastes.Moreover,Fe-BC enriched specific microorganisms,thereby promoting DIET and enhancing the anaerobic digestion of urban organic solid wastes.
作者
刘梦谣
何忻
赵智强
LIU Mengyao;HE Xin;ZHAO Zhiqiang(Key Laboratory of Industrial Ecology and Environmental Engineering,Ministry of Education,School of Environmental Science and Technology,Dalian University of Technology,Dalian 116024,China)
出处
《能源环境保护》
2025年第5期181-190,共10页
Energy Environmental Protection
基金
国家重点研发计划青年科学家资助项目(2022YFA0913100)
国家自然科学基金面上资助项目(52470140)
中央高校基本科研业务费(DUT24LK005)。
关键词
城镇有机固废
厌氧消化
含铁沼渣
生物炭
直接种间电子传递
Municipal organic solid wastes
Anaerobic digestion
Iron-containing digestate
Biochar
Direct interspecific electron transfer
