Anaerobic digestion of crude glycerol from biodiesel manufacturing using a large-scale pilot plant: Methane production and application of digested sludge as fertilizer

Yasunori Baba, Chika Tada, Ryoya Watanabe, Yasuhiro Fukuda, Nobuyoshi Chida, Yutaka Nakai

    Research output: Contribution to journalArticlepeer-review

    42 Citations (Scopus)

    Abstract

    This report is the first to consider methane production energy balance from crude glycerol at a practical rather than a laboratory scale. Crude glycerol was added to the plant progressively at between 5 and 75L glycerol/30m3-day for 1.5years, and the energy balance was positive at a loading rate of 30L glycerol/30m3-day (1ml/L-day). At this loading rate over one year, an energy output equivalent to 106% of the energy input was achieved. The surplus energy was equivalent to transport for 1200km, so the proper feedstock-transportation distance was within a 12.5-km radius of the biogas plant. In addition, the digested sludge contained fertilizer components (T-N: 0.11%, P2O5: 0.036%, K2O: 0.19%) that increased grass yield by 1.2 times when applied to grass fields. Thus, crude glycerol is an attractive bioresource that can be used as both a feedstock for methane production and a liquid fertilizer.

    Original languageEnglish
    Pages (from-to)342-348
    Number of pages7
    JournalBioresource Technology
    Volume140
    DOIs
    Publication statusPublished - 2013 Jul

    Keywords

    • Crude glycerol
    • Digested sludge
    • Energy balance
    • Methane production
    • Pilot plant

    ASJC Scopus subject areas

    • Bioengineering
    • Environmental Engineering
    • Renewable Energy, Sustainability and the Environment
    • Waste Management and Disposal

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