Optimised energy recovery from wastewater sludge

Elina Merta, Mona Arnold

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

    Abstract

    The paper presents a case-based comparison of energy balances and costs of municipal wastewater sludge process chains based on anaerobic digestion or incineration. In chains based on anaerobic digestion, several biogas utilisation options were studied. In addition, the potential of enhancing anaerobic digestion e.g. by converting the process to thermophilic was studied. Based on the results, sludge incineration was the most expensive option of the studied scenarios, but justified if the heat generated can be utilised in district heating. However, the electricity balances in both incineration and anaerobic digestion are close to one another. If anaerobic digestion is used, both from an economical and energy point of view, the best option is to feed the generated biogas to a gas engine to produce electricity and heat. Based on the calculations, thermophilic anaerobic digestion can improve the economy of a WWTP provided that the biogas yield is sufficiently higher than in a mesophilic process.
    Original languageEnglish
    Title of host publicationProceedings
    Subtitle of host publicationThird International Symposium on Energy from Biomass and Waste, Venice 2010
    PublisherCisa Publisher
    ISBN (Print)978-8-8626-5008-3
    Publication statusPublished - 2010
    MoE publication typeA4 Article in a conference publication
    EventThird International Symposium on Energy from Biomass and Waste, Venice 2010 - Venice , Italy
    Duration: 8 Nov 201011 Nov 2010

    Conference

    ConferenceThird International Symposium on Energy from Biomass and Waste, Venice 2010
    Abbreviated titleVenice 2010
    Country/TerritoryItaly
    CityVenice
    Period8/11/1011/11/10

    Keywords

    • anaerobic digestion
    • biogas
    • sludge treatment
    • sludge incineration

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