School of Mechanical Engineering, Tianjin University of Commerce
Environmental Energy+X Innovation Laboratory, Tianjin University of Commerce
College of Biotechnology and Food Science, Tianjin University of Commerce
School of Environmental Science and Engineering, Tianjin University
Metener Company

厌氧发酵是农村有机废弃物能源化转化的重要手段之一,沼渣的高效资源化利用对于促进农业农村低碳能源利用及可持续发展具有重要意义。接种物为发酵过程提供特定的微生物群落,直接影响发酵启动速度、有机物去除率、沼气产量及沼渣品质。为探究不同接种物厌氧发酵对生物质热解行为的影响,以污泥和瘤胃液2种常见和较少见的厌氧发酵接种物为例,对玉米秸秆厌氧消化沼渣进行研究。通过热重和多谱联用分析厌氧发酵前后物料的热解特性,并对热解炭进行了表征。结果表明,沼渣热解所需的表观活化能高于未经发酵的原料,具有更高的热稳定性;污泥发酵沼渣热解活化能较瘤胃液接种沼渣更高;热解过程中,挥发性产物主要以酚类和羰基化合物为主;沼渣热解炭的产率显著高于原料热解炭,且均超过60%;相较于原料热解炭,沼渣热解炭表面粗糙度和多孔结构大幅增加,比表面积和孔隙率增高,同时,污泥沼渣热解炭的比表面积和孔隙率均高于瘤胃液沼渣热解炭,但后者中吡咯-N的相对含量更高,可为沼渣资源化利用提供参考。

To investigate the effects of anaerobic fermentation with different inoculants on thepyrolysis behavior of biomass,this study used biogas residues from anaerobic digestion of corn strawinoculated with rumen fluid and sludge as examples. The pyrolysis characteristics of the materialsbefore and after anaerobic fermentation were analyzed using thermogravimetric analysis and pyrolysis-Energy Environmental Protectiongas chromatography-mass spectrometry (PY-GC-MS), and the resulting biochar was characterized.The results indicated that the apparent activation energy required for the pyrolysis of biogas residueswas higher than that of the raw material before fermentation, indicating greater thermal stability.Furthermore,the activation energy required for the pyrolysis of sludge-fermented biogas residues washigher than that for rumen fluid-fermented biogas residues. The volatile products generated duringpyrolysis were predominantly phenolic compounds and carbonyl compounds. The biochar yield frombiogas residues was significantly higher than that of the raw material,exceeding 60% in both cases.Compared to the raw material,biochar from biogas residue showed increased surface roughness andporosity,resulting in higher specific surface area and porosity. Additionally,the biochar from sludgefermentation had a higher specific surface area and porosity than that from rumen fluid fermentation,though the relative content of pyrrolic-N was higher in the latter. This study provides a reference for theresource utilization of biogas residues.

国家重点研发政府间国际科技创新合作项目(2022YFE0125100)

穆兰,许秦洁,蒋晨光,等.不同接种物发酵沼渣热解制炭对比研究[J].能源环境保护,2024,38(6):188−198.

MU Lan, XU Qinjie, JIANG Chenguang, et al. Comparative study on charcoal production by pyrolysis offermented sludge with different inoculants[J]. Energy Environmental Protection, 2024, 38(6): 188−198.