The effects of post-treatments and temperature on recovering the methane potential of > 2 mm solid fraction of digested cow manure

Prasad Laxmi-Narasimha Kaparaju, J.A. Rintala

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    The effects of thermal and chemical treatments, mechanical maceration and freezing and thawing on recovering the remaining methane potential of the > 2 mm solid fraction of digested cow manure - which accounted for 30% of the original potential of digested cow manure - were studied in laboratory batch assays at 5-20 degrees C and at 35-55 degrees C to evaluate the treatment effects both under long-term (340 d) storage of solids and during active digestion (30 d), respectively. The effects of different treatments on the methane production of the solids varied with incubation temperatures and time. However, in all cases, methane productions at 15 degrees C and lower were slow and low for both untreated and treated solids even after long-term incubation. At 35 and 55 degrees C more methane was recovered from untreated solids producing up to 61-82 ml g(-1) volatile solids (VS)(added) in 30 d and 179-215 ml g(-1) VSadded in 340 d. Only chemical treatment with or without thermal treatment enhanced the methane yields while some treatments even decreased the yields. An increase in temperature to 35 degrees C of the assays incubated for 6 months at
    Original languageEnglish
    JournalEnvironmental Technology (United Kingdom)
    Volume26
    Issue number6
    Pages (from-to)625-631
    ISSN0959-3330
    Publication statusPublished - 2005

    Keywords

    • thermal
    • manure
    • chemical
    • biogas
    • anaerobic digestion
    • post-treatments
    • freeze/ thaw
    • maceration

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