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Microalgae at wastewater pond treatment in cold climate: an ecological engineering approach
Mid Sweden University, Faculty of Science, Technology and Media, Department of Engineering, Physics and Mathematics.
2004 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Three types of wastewater ponds in subarctic climates were investigated, each of them highly dependent on microalgae. They were fellingsdams, i.e. wastewater stabilization ponds complemented with chemical precipitation, high-rate algal ponds (HRAPs), and a type of aquaculture interface ponds between a wastewater treatment plant and the natural surrounding.

From a microalgae taxa perspective green algae and cryptophytes were dominant in the wastewater ponds. Green algae and cryptophytes were also, together with chryso- and haptophytes, dominating the hypereutrophic and eutrophic stages of the natural lakes. Biomasses in the different types of ponds were of very different order of magnitude. From 100-1000 mg/l in the stabilization ponds during summer and 10-100 mg/l in spring and autumn, 70- 90 mg/l in a HRAP in autumn, to 5-30 mg/l in the most hypereutrophic stage in the natural ponds, 1-10 mg/l in the eutrophic stage, and below 1 mg/l in the oligotrophic stage.

The connection between wastewater pond treatment and the field of ecological engineering was recognized. Future development of pond technology may benefit from a stronger connection to the theoretical framework of systems ecology developed in collaboration with the field of ecological engineering and ecotechnology.

Place, publisher, year, edition, pages
Luleå: Univ , 2004.
Series
Doctoral thesis / Luleå tekniska universitet, ISSN 1402-1544 ; 2004:61
National Category
Other Environmental Engineering
Identifiers
URN: urn:nbn:se:miun:diva-9393OAI: oai:DiVA.org:miun-9393DiVA, id: diva2:227633
Public defence
(English)
Available from: 2009-07-15 Created: 2009-07-15 Last updated: 2011-04-06Bibliographically approved

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Grönlund, Erik

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