Liquefaction/solubilization processes of Spanish coals by microorganisms

摘要

Several fundamental aspects of microbial coal liquefaction/solubilization have been studied in this work. The first one is the mechanisms implicated on coal transformation. During coal solubilization, fungal cells produced extracellular peroxidase, esterase and some times phenol oxidase enzymes which appear to be involved in solubilization. Moreover, the analysis of liquefaction/solubilization products was done. In this regard, a reduction on the average size of humic acids derived from lignite was observed, probably due to depolymerization caused by microorganisms. Finally, microorganisms showed a specific adherence to the coal surface, that seems to promote the microbial attack to coal.