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Inclusion of Saccharina latissima in conventional anaerobic digestion systems
Research and Development Department , Scandinavian Biogas Fuels AB , Stockholm , Sweden.
Research and Development Department , Scandinavian Biogas Fuels AB , Stockholm , Sweden.
Linköping University, Department of Thematic Studies, Tema Environmental Change. Linköping University, Faculty of Arts and Sciences.
Linköping University, Department of Thematic Studies, Tema Environmental Change. Linköping University, Faculty of Arts and Sciences.
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2018 (English)In: Environmental technology, ISSN 0959-3330, E-ISSN 1479-487X, Vol. 39, no 5, p. 628-639Article in journal (Refereed) Published
Abstract [en]

Loading macroalgae into existing anaerobic digestion (AD) plants allows us to overcome challenges such as low digestion efficiencies, trace elements limitation, excessive salinity levels and accumulation of volatile fatty acids (VFAs), observed while digesting algae as a single substrate. In this work, the co-digestion of the brown macroalgae Saccharina latissima with mixed municipal wastewater sludge (WWS) was investigated in mesophilic and thermophilic conditions. The hydraulic retention time (HRT) and the organic loading rate (OLR) were fixed at 19 days and 2.1 g l-1 d-1of volatile solids (VS), respectively. Initially, WWS was digested alone. Subsequently, a percentage of the total OLR (20%, 50% and finally 80%) was replaced by S. latissima biomass. Optimal digestion conditions were observed at medium-low algae loading (=50% of total OLR) with an average methane yield close to [Formula: see text] and [Formula: see text] in mesophilic and thermophilic conditions, respectively. The conductivity values increased with the algae loading without inhibiting the digestion process. The viscosities of the reactor sludges revealed decreasing values with reduced WWS loading at both temperatures, enhancing mixing properties.

Place, publisher, year, edition, pages
Taylor & Francis, 2018. Vol. 39, no 5, p. 628-639
Keywords [en]
Seaweed; biomethane; co-digestion; salinity; viscosity
National Category
Water Treatment
Identifiers
URN: urn:nbn:se:liu:diva-146067DOI: 10.1080/09593330.2017.1309075ISI: 000427166700008PubMedID: 28317451Scopus ID: 2-s2.0-85017127668OAI: oai:DiVA.org:liu-146067DiVA, id: diva2:1193805
Available from: 2018-03-27 Created: 2018-03-27 Last updated: 2018-06-13Bibliographically approved

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The full text will be freely available from 2019-04-04 00:01
Available from 2019-04-04 00:01

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Björn, AnnikaSafaric, LukaSvensson, Bo H.Ejlertsson, Jörgen

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