The accumulation of non- or slowly biodegradable organic compounds in an activated sludge process within a Kraft Pulp Mill

Sakari Toivakainen, Heikki Hannukainen, Timo Laukkanen, Olli Dahl

    Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

    1 Citation (Scopus)

    Abstract

    Adsorption of non- or slowly biodegradable organic compounds such as lignin or its derivatives on biosludge may weaken its dewatering properties and suitability for anaerobic digestion. These compounds accumulate in biosludge of an activated sludge process (ASP) within a kraft pulp mill as the sludge retention time (SRT) increases. The specific adsorption characteristics of influent COD and BOD were studied in laboratory-scale with biosludge and ferric sulphate. The accumulation of non- or slowly biodegradable compounds in biosludge was estimated by dynamic modelling using specific influent COD characteristics and the process data from an ECF kraft pulp mill. Approximately 20-30% of influent COD consisted of adsorbable organic compounds that had no effect on BOD5. Due to this fraction, the non- or slowly biodegradable organic content of mixed liquor volatile suspended solids (MLVSS) in biosludge was 45-70% with SRT varying between 25 and 60 days.

    Original languageEnglish
    Title of host publicationPEERS Conference 2014
    PublisherTAPPI Press
    Pages264-274
    Number of pages11
    ISBN (Electronic)9781510815063
    Publication statusPublished - 2014
    MoE publication typeA4 Article in a conference publication
    EventTAPPI PEERS Conference - Tacoma, United States
    Duration: 14 Sep 201417 Sep 2014

    Conference

    ConferenceTAPPI PEERS Conference
    CountryUnited States
    CityTacoma
    Period14/09/201417/09/2014

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