沼渣水热炭添加对猪粪中温厌氧消化的促进作用

摘要

Swine manure digestate hydrochar (H-190) was prepared by hydrothermal carbonization under temperature of 190℃.The hydrochar was added to a bench-scale pig manure batch digester and its effect on anaerobic digestion under temperature of 37℃ was studied.The results showed that,under the system TS of 4.0％,and with the addition of H-190,the biogas and methane productions were 313.07 mL · g-1 VS and 191.35 mL · g-1VS respectively,increasing 29.81％ and 26.22％ respectively comparing with the system without H-190.Under the system TS of 8.0％,the biogas and methane productions were 233.59 mL · g-1VS and 145.00 mL · g-1VS,respectively with the H-190 addition,increasing 12.08％ and 13.39％ respectively comparing with the system without H-190.Addition of H-190 could improve the anaerobic digestion efficiency and shorten the retention time of swine manure system with TS of 4.0％;whereas the opposite trend was found for TS 8.0％ system.The hydrochar prepared from digested swine manure possessed excellent surface characteristics,which might be the major factor for relieving the inhibition of metabolites during anaerobic digestion,promoting the electron transfer between microorganisms.%为探明沼渣水热炭添加对猪粪中温厌氧消化产气的影响,该研究以190℃水热炭化制备的猪粪沼渣水热炭(H-190)为研究对象,采用批次发酵实验,探讨H-190添加对猪粪中温(37℃)厌氧消化产气特性的影响.结果表明,TS=4.0％的猪粪中温厌氧消化系统中,添加H-190后系统的平均产气量和产甲烷量分别为313.07和191.35 mL·g-1VS,较纯猪粪处理提高了29.81％和26.22％;而TS=8％的体系中,添加H-190后,二者分别为233.59和145.00 mL·g-1VS,较纯猪粪处理提高了12.08％和13.39％.添加H-190可提高TS=4％猪粪中温厌氧发酵系统的消化效率,缩短厌氧消化的延滞期,但对TS =8.0％的系统则相反.沼渣水热炭优良的表面特性是缓解猪粪厌氧消化过程中中间代谢物质的抑制、促进微生物间的电子传递、提高系统消化产气和产甲烷的主要原因.该研究对养殖场粪污厌氧消化高效处理具有工程指导意义.