Phosphorus removal in a wetland constructed on former arable land

Journal of Environmental Quality
A LiikanenHelinä Hartikainen

Abstract

Phosphorus in surface runoff water may cause eutrophication of recipient water. This study clarifies the mechanisms of P removal in the wetland of Hovi, Finland, constructed on arable land in 1998. Before the construction, the surface soil (removed in the construction) and subsoil (the current wetland bottom) were analyzed for Al and Fe oxides (Al(ox) and Fe(ox)) reactive in P sorption, and for the distribution of P between various pools as well as for P exchange properties. Retention of P from runoff water within the wetland was studied from 1999 to 2001 in situ and factors affecting the P removal (O2 availability and P concentration in water) were investigated in a laboratory microcosm. The processes taking place in the wetland diminished by 68% the total P load and by 49% the dissolved reactive P load. Desorption-sorption tests indicated that without removal of the surface soil, there would have been a risk of the wetland being a source of P, since the equilibrium P concentration of the soil removed was high compared with the mean P concentration of the inflowing water. The subsoil contained less P and high amounts of reactive oxides, which could bind P. Evidently, the P sorption by Al(ox) played an important role in a first...Continue Reading

Citations

May 22, 2013·Environmental Science and Pollution Research International·Dong ZhouJing-Chao Han
Jan 23, 2009·The Science of the Total Environment·Marika TruuJaak Truu
Jan 6, 2007·The Science of the Total Environment·A K Søvik, B Kløve
Sep 13, 2007·Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering·Guang Jin, Timothy R Kelley
Oct 31, 2006·Journal of Environmental Quality·A K SøvikP Wachniew
Apr 28, 2011·Journal of Environmental Quality·Chris C Tanner, James P S Sukias
Aug 26, 2009·Journal of Environmental Quality·Carl Christian HoffmannBrian Kronvang
Nov 26, 2013·Environmental Science. Processes & Impacts·Allyson S Smith, Pierre-Andre Jacinthe

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