Pretreatment of lignocellulosic biomass with cattle rumen fluid for methane production: Fate of added rumen microbes and indigenous microbes of methane seed sludge

Yasunori Baba, Yu Matsuki, Shuhei Takizawa, Yoshihisa Suyama, Chika Tada, Yasuhiro Fukuda, Masanori Saito, Yutaka Nakai

    Research output: Contribution to journalArticlepeer-review

    9 Citations (Scopus)

    Abstract

    The pretreatment of lignocellulosic substrates with cattle rumen fluid was successfully developed to increase methane production. In the present study, a 16S rRNA gene-targeted amplicon sequencing approach using the MiSeq platform was applied to elucidate the effects of the rumen fluid treatment on the microbial community structure in laboratory-scale batch methane fermenters. Methane production in fermenters fed rumen fluid-treated rapeseed (2,077.3 mL CH4 reactor–1 for a 6-h treatment) was markedly higher than that in fermenters fed untreated rapeseed (1,325.8 mL CH4 reactor–1). Microbial community profiling showed that the relative abundance of known lignocellulose-degrading bacteria corresponded to lignocellulose-degrading enzymatic activities. Some dominant indigenous cellulolytic and hemicellulolytic bacteria in seed sludge (e.g., Cellulosilyticum lentocellum and Ruminococcus flavefaciens) and rumen fluid (e.g., Butyrivibrio fibrisolvens and Prevotella ruminicola) became undetectable or markedly decreased in abundance in the fermenters fed rumen fluid-treated rapeseed, whereas some bacteria derived from seed sludge (e.g., Ruminofilibacter xylanolyticum) and rumen fluid (e.g., R. albus) remained detectable until the completion of methane production. Thus, several lignocellulose-degrading bacteria associated with rumen fluid proliferated in the fermenters, and may play an important role in the degradation of lignocellulosic compounds in the fermenter.

    Original languageEnglish
    Pages (from-to)421-428
    Number of pages8
    JournalMicrobes and environments
    Volume34
    Issue number4
    DOIs
    Publication statusPublished - 2019

    Keywords

    • Bioaugmentation
    • Lignocellulose
    • Methane fermentation
    • MiSeq
    • Rumen

    ASJC Scopus subject areas

    • Ecology, Evolution, Behavior and Systematics
    • Soil Science
    • Plant Science

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