A major concern in modern landfill prisms is their microbiology and the question of by-product generation, especially the effectiveness of methanogenesis under limited availability of biodegradable organic matter. Thus, in this study, seven samples of MP leachate (from the 2nd, 5th, 8th, 13th, 19th, 25th and 37th month of MP operation) were further subjected to next-generation sequencing and q-PCR searching for the key functional genes involved in the
methanogenesis (mcrA) and dissimilatory sulphate reduction (dsrA) processes.