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Seasonal Operation of Ponds for Chemical Precipitation of Wastewater
Div. of Sanitary Engineering, Luleå Univ. of Technology, SE-971 87 Luleå.
Mid Sweden University, Faculty of Science, Technology and Media, Department of Engineering and Sustainable Development.
Div. of Sanitary Engineering, Luleå Univ. of Technology, SE-971 87 Luleå.
2010 (English)In: Journal of cold regions engineering, ISSN 0887-381X, E-ISSN 1943-5495, Vol. 24, no 4, 98-111 p.Article in journal (Refereed) Published
Abstract [en]

Wastewaterprecipitation ponds (fellingsdams) are conventional stabilization ponds adapted to coldclimate by the use of chemical precipitation to attain sufficientremoval efficiency of impurities, primarily phosphorus. The objective with thisinvestigation was to study the influence of an interruption ofthe dosage of coagulant during summer periods at two fellingsdamsystems (Orrviken and Lockne) in the middle of Sweden. Theinvestigation took place over two years characterized by unusual precipitationconditions; 2001 was intense in precipitation whereas summer 2002 representeda dry season. The results showed that there is apotential to utilize the summer biological activity in fellingsdams. AtOrrviken the effluent quality measured as organic matter and phosphorusin the effluent was just slightly above the values thatwere reached by chemical precipitation. At Lockne the performance waslower. The organic matter reduction at Orrviken in the summersof 2001 and 2002 were 71 and 67%, respectively, comparedto previous years using precipitant when the average was 78%.At Lockne, however, the values in the summers of 2001and 2002 were 36 and 18%, respectively, compared to previousyears using precipitant when the average was 55%. The phosphorousreduction at Orrviken in the summers of 2001 and 2002were 85 and 89%, respectively, compared to previous years usingprecipitant when the average was 95%; at the Lockne plant,the phosphorous reduction during the summers of 2001 and 2002were 60 and 66%, respectively, compared to the previous years'average of 86%. The nitrogen reduction varied considerably over thetwo summer periods. The reduction at Orrviken was 13% in2001 and 58% in 2002; the reduction at Lockne was13% in 2001 and 33% in 2002. Reference values ofnitrogen reduction during normal operations were not available.

Place, publisher, year, edition, pages
ASCE , 2010. Vol. 24, no 4, 98-111 p.
Keyword [en]
Precipitation, Waste stabilization ponds KW - Abatement and removal, Organic matter, Phosphorus, Nitrogen, Cold regions
National Category
Other Environmental Engineering
Identifiers
URN: urn:nbn:se:miun:diva-12303DOI: 10.1061/(ASCE)CR.1943-5495.0000017ISI: 000284273900001Scopus ID: 2-s2.0-78349254555OAI: oai:DiVA.org:miun-12303DiVA: diva2:372776
Available from: 2010-11-28 Created: 2010-11-28 Last updated: 2016-09-22Bibliographically approved

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