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Microalgae at wastewater pond treatment in cold climate: an ecological engineering approach
Luleå tekniska universitet.
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: Luleå tekniska universitet, 2004. , 14 p.
Doctoral thesis / Luleå University of Technology 1 jan 1997 → …, ISSN 1402-1544 ; 2004:61
Research subject
Urban Water Engineering
URN: urn:nbn:se:ltu:diva-16822Local ID: 02f8ae20-54b4-11db-9592-000ea68e967bOAI: diva2:989809
Godkänd; 2004; 20061005 (ysko)Available from: 2016-09-29 Created: 2016-09-29Bibliographically approved

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