Effect of macro- and micro-nutrients addition during anaerobic mono-digestion of grass silage in leach-bed reactors

Padma Shanthi Jagadabhi, Prasad Kaparaju, Ari Väisänen, Jukka Rintala

    Research output: Contribution to journalArticleScientificpeer-review

    3 Citations (Scopus)

    Abstract

    The effect of macro- (NH4Cl) (set I) and micro-nutrients (Fe, Ni, Co and Mo) (set II) addition on chemical oxygen demand (COD) solubilisation during anaerobic mono-digestion of grass silage was investigated in two sets of leach bed reactor experiments at 35°C. Results showed that addition of NH4Cl and micro-nutrients improved COD solubilisation by 18% (0.56 g SCOD g−1 volatile solids) and 7% (0.45 g SCOD g−1 VS), respectively than control. About 20–50% of the added micro-nutrients were bioavailable in the produced leachates, while the rest (50–80%) were adsorbed onto the grass silage. Results of biological methane potential assays showed that, specific methane yields of grass silage were improved by 17% (0.36 ± 0.02 m3 CH4 kg−1 VSadded) when NH4Cl was supplemented while Fe, Ni, Co and Mo addition improved methane yields by 15% (0.33 ± 0.005 m3 CH4 kg−1 VSadded) when compared to control.

    Original languageEnglish
    Pages (from-to)418-429
    Number of pages12
    JournalEnvironmental Technology
    Volume40
    Issue number4
    DOIs
    Publication statusPublished - 2019
    Publication typeA1 Journal article-refereed

    Keywords

    • anaerobic digestion
    • grass silage
    • Leach bed reactor
    • methane
    • micro-nutrients

    Publication forum classification

    • Publication forum level 1

    ASJC Scopus subject areas

    • Environmental Chemistry
    • Water Science and Technology
    • Waste Management and Disposal

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