Thermophilic co-digestion of organic fraction of municipal solid wastes with FOG wastes from a sewage treatment plant: Reactor performance and microbial community monitoring

Lucia Martín-González, Rita Castro, M. Alcina Pereira, M. Madalena Alves, Xavier Font, Teresa Vicent

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    Abstract

    Working at thermophilic conditions instead of mesophilic, and also the addition of a co-substrate, are both the ways to intend to improve the anaerobic digestion of the source-collected organic fraction of municipal solid wastes (SC-OFMSW). Addition of sewage treatment plant fat, oil and grease wastes (STP-FOGW), that are nowadays sent to landfill, would represent an opportunity to recover a wasted methane potential and, moreover, improve the whole process. In this study, after a first period feeding only SC-OFMSW, a co-digestion step was performed maintaining thermophilic conditions. During the co-digestion period enhancements in biogas production (52%) and methane yield (36%) were achieved. In addition, monitoring of microbial structure by using PCR-DGGE and cloning techniques showed that bacterial community profiles clustered in two distinct groups, before and after the extended contact with STP-FOGW, being more affected by the STP-FOGW addition than the archaeal one. © 2011 Elsevier Ltd.
    Original languageEnglish
    Pages (from-to)4734-4741
    JournalBioresource Technology
    Volume102
    DOIs
    Publication statusPublished - 1 Apr 2011

    Keywords

    • FOG wastes
    • Microbial diversity
    • OFMSW
    • PCR-DGGE
    • Thermophilic anaerobic co-digestion

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