纳米Fe3O4在煤微生物降解产CH4过程中的催化作用OACSTPCD

Objective To study the catalytic effect of nano-Fe3O4 on producing methane(CH4)in the process of microbial degradation of coal,Methods two types of microbial communities,which were come from the mine water from Jincheng mining area and soil from Zhongyuan oilfield,were used to anaerobic digest coal samples from Yima mining area.The effects of temperature and nano Fe3O4 addition quantity on the molar concentration of CH4 produced in the reaction system were investigated.The changes of the molar concentra-tions of CO2 and H2 were also analyzed during the process of CH4 production;their effects on the molar con-centration of CH4 were evaluated.The role and maximum loading of iron were also evaluated in the anaerobic digestion reaction system and CH4 production.Results Basing on analysis of co-cultivation results of anaerobic methanogenic archaea and polycyclic aromatic hydrocarbon decomposing bacteria;it was believed that the anaerobic reaction of coal degradation and methanogenesis were consisting of two main steps,the first step was the carboxylation reaction of fused-ring aromatic hydrocarbon activation,which degraded coal into pmethylphenol and 2-naphthalenecarboxylic acid-;the second step was that organic acids,methyl groups and gases produced by coal decomposition were used to generate methane through the biochemical reaction of coenzymes,the yield of methane in this process increased with the increasing of temperature,and a large amount of CO2 had been existed in the initiating reaction of the process.The production of methane gas in-creased 39.6%～50.8%after adding nano-Fe3O4 into the bacteria co-cultivation system.The catalytic effect of nano-Fe3O4 on the process of production of methane gas was to promote the production of intermediate products(hydrogen,CO2 etc.),which were consumed by methanogenic archaea and liquid water was generated to re-duce the gas pressure of the reaction system,so the catalytic reaction could continue in a positive direction.Conclusion The catalytic effect of nano-Fe3O4 on microbial degradation of coal producing CH4 requires a multi-bacterial environment,and there is an optimal loading amount during the catalytic process.