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Performance of an Experimental Wastewater Treatment High-Rate Algal Pond in Subarctic Climate
Mid Sweden University, Faculty of Science, Technology and Media, Department of Engineering and Sustainable Development.
Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences, Engineering and Mathematics.
2010 (English)In: Water environment research, ISSN 1061-4303, E-ISSN 1554-7531, Vol. 82, no 9, 830-839 p.Article in journal (Refereed) Published
Abstract [en]

A pilot-scale experimental high-rate algal pond (HRAP) was investigated in the subarctic mid-Sweden region, at latitude 63°N. During autumn 2002, conditions included temperatures below 10°C and photosynthetic active radiation below 200 µE/m2·s. Biochemical oxygen demand was reduced by approximately 90% (approximately 40 g/m3), chemical oxygen demand by 65% (approximately 80 g/m3), total phosphorus by 20% (approximately 1 g/m3), and total nitrogen by 46% (approximately 15 g/m3), at a retention time of approximately 2.5 days. During autumn 2003, the performance of the HRAP appeared better with a more dense microalgae culture; however, as a result of poor settling of the microalgae, the reduction was considerably lower. A major difference between the years was the microalgae composition. In 2002, the large green algae Coelastrum dominated with Chlamydomonas, Scenedesmus, Lagerheimia, and the Cryptophyte Rhodomonas. In 2003, there was a total dominance of the very small green algae Chlorella, known to be difficult to settle. In batch growth experiments during spring 2002, doubling times of 4 to 6 days were achieved. The period of temperatures above 10°C and an insolation of more than approximately 270 uE/m2·s (125 Langleys), which is well-documented as appropriate for HRAP function (<xref ref-type="bibr" rid="i1061-4303-82-9-830-Oswald2">Oswald, 1988a</xref>, <xref ref-type="bibr" rid="i1061-4303-82-9-830-Oswald4">1988c</xref>), were measured to last for 4 to 4.5 months from early May to late September. However, the growth and treatment performance experiments indicated that a longer season may be possible—6.5 to 7 months, at best—from early April to late October.

Place, publisher, year, edition, pages
2010. Vol. 82, no 9, 830-839 p.
Keyword [en]
microalgae; wastewater; raceway; high-rate algal pond; cold climate
National Category
Biological Sciences
Identifiers
URN: urn:nbn:se:miun:diva-13150DOI: 10.2175/106143009X12487095236478ISI: 000281195900008Scopus ID: 2-s2.0-79952112453OAI: oai:DiVA.org:miun-13150DiVA: diva2:390797
Available from: 2011-01-24 Created: 2011-01-24 Last updated: 2016-09-22Bibliographically approved

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Grönlund, ErikFalk, Stefan
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