title: Long-term purification efficiency of a wetland constructed to treat runoff from peat extraction.
abstract: Peat extraction increases the phosphorus, nitrogen, organic matter, suspended solids, and iron concentrations in runoff, resulting in negative effects on downstream water bodies. Wetlands are commonly used as natural cost-effective solutions to mitigate these negative effects. This study analyzed changes in the quality of runoff water from peat extraction areas and the long-term efficiency of constructed wetlands. The results indicate that the quality of runoff water changed after the initial drainage and during peat extraction. Nitrogen leached at high concentrations in the early stages of peat extraction following drainage, whereas the leaching of iron and phosphorus increased after peat extraction from deeper layers. Comparison of water quality and impurities retained immediately after treatment wetland construction and 14 years later showed that the treatment wetland remained functional, with good retention capacity, over a long period.
authors.affiliation: a Freshwater Centre, Finnish Environment Institute , Oulu , Finland.
authors.forename: Satu M
authors.initials: SM
authors.lastname: Karjalainen
authors.affiliation: a Freshwater Centre, Finnish Environment Institute , Oulu , Finland.
authors.forename: Kaisa
authors.initials: K
authors.lastname: Heikkinen
authors.affiliation: a Freshwater Centre, Finnish Environment Institute , Oulu , Finland.
authors.forename: Raimo
authors.initials: R
authors.lastname: Ihme
authors.affiliation: b Water Resources and Environmental Engineering Research Group, Faculty of Technology, University of Oulu , Finland.
authors.forename: Bjørn
authors.initials: B
authors.lastname: Kløve
mesh_terms: D005387:Finland; D007501:Iron / Q000032:analysis; D009584:Nitrogen / Q000032:analysis; D010758:Phosphorus / Q000032:analysis; D012987:Soil / Q000737:chemistry*; D013997:Time Factors; D014867:Water / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000032:analysis* / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*; D060753:Water Quality; D053833:Wetlands
chemical_list: D012987:Soil; D014874:Water Pollutants, Chemical; D014867:Water; D010758:Phosphorus; D007501:Iron; D009584:Nitrogen
keywords: Nitrogen; peat extraction; phosphorus; suspended solids; water purification; wetland