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Microalgae as biological treatment for municipal wastewater - Effects on the sludge handling in a treatment plant
Mälardalen University, School of Business, Society and Engineering, Future Energy Center.ORCID iD: 0000-0002-0861-6438
Mälardalen University, School of Business, Society and Engineering, Future Energy Center.ORCID iD: 0000-0002-5014-3275
Mälardalen University, School of Business, Society and Engineering, Future Energy Center.ORCID iD: 0000-0003-3311-9465
Mälardalen University, School of Business, Society and Engineering, Future Energy Center.ORCID iD: 0000-0002-3485-5440
2018 (English)In: Water Science and Technology, ISSN 0273-1223, E-ISSN 1996-9732, ISSN 0273-1223, Vol. 78, no 3, p. 644-654Article in journal (Refereed) Published
Abstract [en]

A mix of microalgae and bacteria was cultivated on pre-sedimented municipal wastewater in a continuous operated microalgae-activated sludge process. The excess material from the process was co-digested with primary sludge in mesophilic and thermophilic conditions in semi-continuous mode (5 L digesters). Two reference digesters (5 L digesters) fed with waste-activated sludge (WAS) and primary sludge were operated in parallel. The methane yield was slightly reduced (≈10%) when the microalgal-bacterial substrate was used in place of the WAS in thermophilic conditions, but remained approximately similar in mesophilic conditions. The uptake of heavy metals was higher with the microalgal-bacterial substrate in comparison to the WAS, which resulted in higher levels of heavy metals in the digestates. The addition of microalgal-bacterial substrate enhanced the dewaterability in thermophilic conditions. Finally, excess heat can be recovered in both mesophilic and thermophilic conditions. 

Place, publisher, year, edition, pages
IWA Publishing , 2018. Vol. 78, no 3, p. 644-654
Keywords [en]
Dewaterability, Heat balance, Heavy metals, Microalgae, Semi-continuous study, Waste activated sludge, Algae, Anaerobic digestion, Biological water treatment, Microorganisms, Wastewater treatment, Micro-algae, Semi-continuous, Waste activated sludges, Activated sludge process, Bacteria (microorganisms)
National Category
Water Engineering
Identifiers
URN: urn:nbn:se:mdh:diva-41017DOI: 10.2166/wst.2018.334ISI: 000445518100018PubMedID: 30208005Scopus ID: 2-s2.0-85053616456OAI: oai:DiVA.org:mdh-41017DiVA, id: diva2:1251556
Available from: 2018-09-27 Created: 2018-09-27 Last updated: 2019-06-18Bibliographically approved

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Olsson, JesperSchwede, SebastianNehrenheim, EmmaThorin, Eva

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