Improving the stability of thermophilic anaerobic digesters treating SS-OFMSW through enrichment with compost and leachate seeds

Sophia Ghanimeh, Mutasem El-Fadel, Pascal Saikaly

    Research output: Contribution to journalArticlepeer-review

    21 Scopus citations

    Abstract

    This paper examines the potential of improving the stability of thermophilic anaerobic digestion of source-sorted organic fraction of municipal solid waste (SS-OFMSW) by adding leachate and compost during inoculation. For this purpose, two stable thermophilic digesters, A (control) and B (with added leachate and compost), were subjected to a sustained substrate shock by doubling the organic loading rate for one week. Feeding was suspended then gradually resumed to reach the pre-shock loading rate (2. gVS/l/d). Digester A failed, exhibiting excessive increase in acetate and a corresponding decrease in pH and methane generation, and lower COD and solids removal efficiencies. In contrast, digester B was able to restore its functionality with 90% recovery of pre-shock methane generation rate at stable pH, lower hydrogen levels, and reduced VFAs and ammonia accumulation.

    Original languageBritish English
    Pages (from-to)53-59
    Number of pages7
    JournalBioresource Technology
    Volume131
    DOIs
    StatePublished - Mar 2013

    Keywords

    • Non-acclimated seed
    • Shock-load
    • Stability
    • Thermophilic anaerobic digestion

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