Phosphate removal by peat from peat mining drainage water during overland flow wetland treatment

Kaisa Heikkinen (Corresponding Author), Raimo Ihme, Anna-Mari Osma, Helinä Hartikainen

Research output: Contribution to journalArticleScientificpeer-review

34 Citations (Scopus)

Abstract

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
Original languageEnglish
Pages (from-to)597-602
JournalJournal of Environmental Quality
Volume24
Issue number4
DOIs
Publication statusPublished - 1995
MoE publication typeA1 Journal article-refereed

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Peat
drainage water
Wetlands
overland flow
Drainage
Sorption
peat
water flow
Phosphates
sorption
wetland
Water
isotherm
adsorption
mire
oxalate
Adsorption isotherms
Isotherms
phosphate removal
Wastewater

Cite this

Heikkinen, Kaisa ; Ihme, Raimo ; Osma, Anna-Mari ; Hartikainen, Helinä. / Phosphate removal by peat from peat mining drainage water during overland flow wetland treatment. In: Journal of Environmental Quality. 1995 ; Vol. 24, No. 4. pp. 597-602.
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abstract = "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",
author = "Kaisa Heikkinen and Raimo Ihme and Anna-Mari Osma and Helin{\"a} Hartikainen",
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Phosphate removal by peat from peat mining drainage water during overland flow wetland treatment. / Heikkinen, Kaisa (Corresponding Author); Ihme, Raimo; Osma, Anna-Mari; Hartikainen, Helinä.

In: Journal of Environmental Quality, Vol. 24, No. 4, 1995, p. 597-602.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Phosphate removal by peat from peat mining drainage water during overland flow wetland treatment

AU - Heikkinen, Kaisa

AU - Ihme, Raimo

AU - Osma, Anna-Mari

AU - Hartikainen, Helinä

N1 - Project code: YKI4332

PY - 1995

Y1 - 1995

N2 - 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

AB - 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

U2 - 10.2134/jeq1995.00472425002400040007x

DO - 10.2134/jeq1995.00472425002400040007x

M3 - Article

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JF - Journal of Environmental Quality

SN - 0047-2425

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ER -