不同导电材料及用量对菊芋秸秆与猪粪共消化性能的影响OA

To explore the application potential of different conductive materials in anaerobic digestion systems,based on the medium temperature batch anaerobic digestion technology,7 conductive materials including graphite(C1),biochar(C2),activated carbon(C3),nano-zero-valent iron(F1),micro-zero-valent iron(F2),Fe2O3(F3)and Fe3O4(F4)were added to the co-digestion system of Jerusalem artichoke straw and pig manure,their enhancement effects on co-digestion at different dosages(2%,6%,10%,14%)were investigated.The results showed that the addition of conductive materials was all able to enhance the methanogenic performance of the co-digestion system,and Fe2O3 and Fe3O4 in the iron-based materials and biochar in the carbon-based materials showed better enhancement effects overall.The co-digestion performance was closely related to the dosages of conductive materials.The optimal amount of micro-zero-valent iron,Fe2O3,Fe3O4,graphite and biochar were 6%,and nano-zero-valent iron and activated carbon were 2%and 10%,respectively.Among them,the cumulative methane production was higher in the 6%C2,6%F3 and 6%F4 treatments,which were 433.86,429.92 and 428.13 mL·g-1,respectively,which were elevated by 35.46%,34.24%and 33.68%,respectively,compared to the control group without conductive materials(CK).6%C2 treatment was considered the optimal conductive material treatment method in co-digestion systems due to its superior methanogenic performance,lower dosage requirements and better economic benefits.Compared to CK,the relative abundance of Syner-01 bacteria increased in samples with conductive materials.Clostridium_sensu_stricto_1 also rose in these samples,except with nano-zero-valent iron.In archaeal communities,Methanothrix and Methanosarcina were more abundant in biochar,activated carbon,graphite,and both forms of zero-valent iron samples,Methanoculleus was higher in Fe2O3 and Fe3O4 samples.The study demonstrated that carbon-based materials and zero-valent iron enhanced methane production by enriching acetoclastic methanogens and strengthening direct interspecies electron transfer.In contrast,iron oxide amendments primarily boosted methane yield by stimulating the metabolic activity of hydrogenotrophic methanogens.Above results provided a scientific basis for the resource utilization of agricultural wastes such as crop straw and manure.