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Nitrogen removal from pretreated wastewater in surface flow wetlands
SMHI, Research Department.
1995 (English)In: Water Science and Technology, ISSN 0273-1223, E-ISSN 1996-9732, Vol. 32, no 3, 69-78 p.Article in journal (Refereed) Published
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Text
Abstract [en]

The wastewater treatment plant in the town of Oxelosund (12,500 inhabitants), Sweden, has mechanical and chemical treatment for removal of BOD and phosphorus. With the aim to achieve 50% nitrogen removal, a surface flow wetland system of 21 ha was created as a final step during 1993. It consists of 5 cells, where 2+2 are operated in parallel with a final common cell, This allows intermittent filling and emptying, the goal of which is to promote both nitrification and denitrification for a design flow of 6000 m(3) day(-1). During the first year of operation, August 1993 to July 1994, the wetland removed 720 kg ha(-1) of total nitrogen from the load of 1810 kg ha(-1). Ammonium-N was the dominant fraction at the inlet as well as at the outlet, 79% and 90% of total nitrogen, respectively. The large fraction of NH4+ at the outlet showed that nitrification was the limiting step. An intensive monitoring effort in May 1994 indicated that neither wastewater toxicity nor oxygen deficiency were likely to limit nitrification. Instead, sub-optimal hydraulic loading conditions; a lack of suitable surfaces for ion exchange of NH4+ as well as for attachment of nitrifiers; and phosphorus deficiency, were considered potentially important factors in limiting nitrification. In addition to nitrogen removal, the wetland system reduced total phosphorus, BOD7 and E. coli (44 degrees C) to very low levels at the outlet.

Place, publisher, year, edition, pages
KING CTY DEPT PUBL WORKS,RD & ENGN DIV,SEATTLE,WA 98104., 1995. Vol. 32, no 3, 69-78 p.
Keyword [en]
municipal wastewater, nitrification, nitrogen removal, surface flow wetland
National Category
Oceanography, Hydrology, Water Resources
Research subject
Hydrology
Identifiers
URN: urn:nbn:se:smhi:diva-1657DOI: 10.1016/0273-1223(95)00606-0ISI: A1995TP20600009OAI: oai:DiVA.org:smhi-1657DiVA: diva2:897567
Conference
4th International Conference on Wetland Systems for Water Pollution Control, NOV 06-10, 1994, CANTON, PEOPLES R CHINA
Available from: 2016-01-26 Created: 2015-12-22 Last updated: 2016-04-05Bibliographically approved

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