Phosphate removal by peat from peat mining drainage water during overland flow wetland treatment
Overland flow technique, which involves conducting wastewater across a natural mire, has during the recent years been widely used in Finland to decrease the loading of P and other elements from peat mining areas to the watercourses. In this study the applicability of laboratory tests in estimating t...
Published in: | Journal of Environmental Quality |
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ftvttcrispub:oai:cris.vtt.fi:publications/ca8e0e74-489a-442f-af2a-6abcd1e59c00 2023-05-15T17:42:47+02:00 Phosphate removal by peat from peat mining drainage water during overland flow wetland treatment Heikkinen, Kaisa Ihme, Raimo Osma, Anna-Mari Hartikainen, Helinä 1995 https://cris.vtt.fi/en/publications/ca8e0e74-489a-442f-af2a-6abcd1e59c00 https://doi.org/10.2134/jeq1995.00472425002400040007x eng eng info:eu-repo/semantics/closedAccess Heikkinen , K , Ihme , R , Osma , A-M & Hartikainen , H 1995 , ' Phosphate removal by peat from peat mining drainage water during overland flow wetland treatment ' , Journal of Environmental Quality , vol. 24 , no. 4 , pp. 597-602 . https://doi.org/10.2134/jeq1995.00472425002400040007x article 1995 ftvttcrispub https://doi.org/10.2134/jeq1995.00472425002400040007x 2022-10-13T13:55:18Z Overland flow technique, which involves conducting wastewater across a natural mire, has during the recent years been widely used in Finland to decrease the loading of P and other elements from peat mining areas to the watercourses. In this study the applicability of laboratory tests in estimating the P retention by overland flow areas was assessed at a site in northern Finland. The ability of peat to retain PO4-P was determined by adsorption isotherms, and the data were compared with the actual decreases in P loads obtained in the field. The PO4-P retention curves obeyed rather well the conventional adsorption models, which suggests that sorption can be an important mechanism removing PO4-P from the peat mining drainage water during overflow treatment. The Freundlich equation gave a better fit to the P sorption than did the one-surface Langmuir model. The constants describing the sorption characteristics of the peat showed spatial and temporal variation. They indicated, however, that the theoretical effective P sorption time for the overland flow area can be 20 to 25 yr. The ability of peat to retain P increased with increasing concentrations of oxalate extractable Fe and Al. Sorption reactions were found to be important in the annual decreases in PO4-P from drainage waters in an overland flow area, but their efficiency in removing P from the peat mining drainage water appears to depend on hydrological conditions. In the first experimental year, the sorption calculated from the isotherm data amounted to 60% of the retention obtained in the field. Owing to the high flow conditions in the second year, the decrease in the loading of P in the field was decisively lower than estimated Article in Journal/Newspaper Northern Finland VTT's Research Information Portal Langmuir ENVELOPE(-67.150,-67.150,-66.967,-66.967) Journal of Environmental Quality 24 4 597 602 |
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VTT's Research Information Portal |
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ftvttcrispub |
language |
English |
description |
Overland flow technique, which involves conducting wastewater across a natural mire, has during the recent years been widely used in Finland to decrease the loading of P and other elements from peat mining areas to the watercourses. In this study the applicability of laboratory tests in estimating the P retention by overland flow areas was assessed at a site in northern Finland. The ability of peat to retain PO4-P was determined by adsorption isotherms, and the data were compared with the actual decreases in P loads obtained in the field. The PO4-P retention curves obeyed rather well the conventional adsorption models, which suggests that sorption can be an important mechanism removing PO4-P from the peat mining drainage water during overflow treatment. The Freundlich equation gave a better fit to the P sorption than did the one-surface Langmuir model. The constants describing the sorption characteristics of the peat showed spatial and temporal variation. They indicated, however, that the theoretical effective P sorption time for the overland flow area can be 20 to 25 yr. The ability of peat to retain P increased with increasing concentrations of oxalate extractable Fe and Al. Sorption reactions were found to be important in the annual decreases in PO4-P from drainage waters in an overland flow area, but their efficiency in removing P from the peat mining drainage water appears to depend on hydrological conditions. In the first experimental year, the sorption calculated from the isotherm data amounted to 60% of the retention obtained in the field. Owing to the high flow conditions in the second year, the decrease in the loading of P in the field was decisively lower than estimated |
format |
Article in Journal/Newspaper |
author |
Heikkinen, Kaisa Ihme, Raimo Osma, Anna-Mari Hartikainen, Helinä |
spellingShingle |
Heikkinen, Kaisa Ihme, Raimo Osma, Anna-Mari Hartikainen, Helinä Phosphate removal by peat from peat mining drainage water during overland flow wetland treatment |
author_facet |
Heikkinen, Kaisa Ihme, Raimo Osma, Anna-Mari Hartikainen, Helinä |
author_sort |
Heikkinen, Kaisa |
title |
Phosphate removal by peat from peat mining drainage water during overland flow wetland treatment |
title_short |
Phosphate removal by peat from peat mining drainage water during overland flow wetland treatment |
title_full |
Phosphate removal by peat from peat mining drainage water during overland flow wetland treatment |
title_fullStr |
Phosphate removal by peat from peat mining drainage water during overland flow wetland treatment |
title_full_unstemmed |
Phosphate removal by peat from peat mining drainage water during overland flow wetland treatment |
title_sort |
phosphate removal by peat from peat mining drainage water during overland flow wetland treatment |
publishDate |
1995 |
url |
https://cris.vtt.fi/en/publications/ca8e0e74-489a-442f-af2a-6abcd1e59c00 https://doi.org/10.2134/jeq1995.00472425002400040007x |
long_lat |
ENVELOPE(-67.150,-67.150,-66.967,-66.967) |
geographic |
Langmuir |
geographic_facet |
Langmuir |
genre |
Northern Finland |
genre_facet |
Northern Finland |
op_source |
Heikkinen , K , Ihme , R , Osma , A-M & Hartikainen , H 1995 , ' Phosphate removal by peat from peat mining drainage water during overland flow wetland treatment ' , Journal of Environmental Quality , vol. 24 , no. 4 , pp. 597-602 . https://doi.org/10.2134/jeq1995.00472425002400040007x |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.2134/jeq1995.00472425002400040007x |
container_title |
Journal of Environmental Quality |
container_volume |
24 |
container_issue |
4 |
container_start_page |
597 |
op_container_end_page |
602 |
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1766144693642461184 |