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Effects of water depth and phosphorus on nitrogen removal in agricultural wetlands
Halmstad University, School of Business, Engineering and Science.
2018 (English)Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

Excess nitrogen (N) from agriculture runoff is a problematic pollutant in aquatic ecosystems. Free water surface created wetlands are widely used as a buffering system to lower the impacts of extra nutrients from agriculture runoff. The purpose of this paper is to evaluate critical factors for nitrogen removal. In this study, 12 free water flow wetlands with similar size and vegetation type and density were used as experimental wetlands. The effects of water depths, mean depth of 0.4m and 0.6m, and phosphorus, with external phosphorus and without external phosphorus were investigated from July 2017 to October 2017.

Significant higher relative nitrogen removal (%) and first-order area-based rate coefficients (Ka) with modified Arrenhius temperature dependency were found in deep wetland basins. No significant difference in absolute nitrogen removal (g m-2 d-1) between the different water depths. As for phosphorus, significant higher absolute nitrogen removal and first-order area-based rate coefficients were found in basins with external phosphorus. No significant difference in relative nitrogen removal between the wetland basins with phosphorus and without phosphorus. Both the nitrogen removal and first-order area-based rate coefficients showed seasonal patterns, with better performance during warm period.

Place, publisher, year, edition, pages
2018. , p. 15
Keywords [en]
Free water surface created wetlands, Agriculture runoff, Nitrogen removal, Water depth, Phosphorus
National Category
Environmental Sciences
Identifiers
URN: urn:nbn:se:hh:diva-37338OAI: oai:DiVA.org:hh-37338DiVA, id: diva2:1225430
Subject / course
Environmental Science
Educational program
Master's Programme in Applied Environmental Science
Supervisors
Examiners
Available from: 2018-07-03 Created: 2018-06-27 Last updated: 2018-07-03Bibliographically approved

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Citation style
  • apa
  • harvard1
  • ieee
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  • vancouver
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  • de-DE
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  • en-US
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  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf