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Acidophilic degradation of methanol by a methanogenic enrichment culture
Authors:L. Florencio  A. Nozhevnikova  A. van  Langerak   A.J.M. Stams  J.A. Field  G. Lettinga
Affiliation:Department of Environmental Technology, Wageningen Agricultural University, Wageningen, The Netherlands; Department of Microbiology, Wageningen Agricultural University, Wageningen, The Netherlands
Abstract:Abstract An acidophilic methanogenic enrichment culture was obtained in a continuous up-flow anaerobic sludge blanket reactor operated at pH 4.2 with methanol as the sole carbon source. The specific methylotrophic methanogenic activity of the enriched reactor sludge at pH 5 was 3.57 g COD g−1 volatile suspended solids day−1 and the apparent doubling time of the biomass was 15.8 h. Acidic conditions were obligatory, since the enrichment culture was not able to produce methane or to grow at pH 7. Based on morphological characteristics, the dominant methanogenic species in the enrichment culture was a Methanosarcina .
Keywords:Methylotrophic    Acidophilic methanogenesis    Methanosarcina    Methanol    Bioreactor    Anaerobic degradation
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