Contribution of cation exchange property of overflow wetland peat to removal of NH4+ discharged from some Finnish peat mines

Kaisa Heikkinen, Raimo Ihme, Esko Lakso

Research output: Contribution to journalArticleScientificpeer-review

11 Citations (Scopus)

Abstract

The importance of adsorption on peat for decreasing NH4+ was estimated in four overland flow areas (OFA) in northern Finland, where peat mining water is purified by conducting it across a natural mire of a given size. The effective cation exchange capacity (ECEC) values of peat in the OFAs ranged from 21.4 to 92.7 meq per 100g, being generally highest in the surface 0–15 cm. It was estimated that about 4.6–5.8% of the peat cation exchan e sites could be occupied by NH4+, corresponding to a NH4+ retention capacity of about 0.18 to 0.77 g kg−1 dry peat. Assuming that the retention was attributable to the 0–15 cm surface peat layer alone, the calculated NH4+ retention potential of OFA peat should have lasted under 6 months with the loadings imposed on the OFAs and the decreases in NH4+ amounts in peat mining water considered here. The actual duration of peat capacity to retain NH4+ in the OFAs has, however, already been shown in this research to be longer, and apparently will be so also in future, probably as a result of two processes: nitrification and subsequent N loss through denitrification, and biological assimilation. Hence, cation exchange capacity of OFA was an important property that contributed to surface water protection against eutrophication by N.

Original languageEnglish
Pages (from-to)207-214
JournalApplied Geochemistry
Volume10
Issue number2
DOIs
Publication statusPublished - 1995
MoE publication typeA1 Journal article-refereed

Fingerprint

Peat
Wetlands
Cations
peat
ion exchange
Ion exchange
Positive ions
wetland
overland flow
cation exchange capacity
removal
Eutrophication
Nitrification
Water
Denitrification
mire
Surface waters
nitrification
eutrophication
denitrification

Cite this

@article{4dc8bbf6d6d746ce9fd4592609b72d74,
title = "Contribution of cation exchange property of overflow wetland peat to removal of NH4+ discharged from some Finnish peat mines",
abstract = "The importance of adsorption on peat for decreasing NH4+ was estimated in four overland flow areas (OFA) in northern Finland, where peat mining water is purified by conducting it across a natural mire of a given size. The effective cation exchange capacity (ECEC) values of peat in the OFAs ranged from 21.4 to 92.7 meq per 100g, being generally highest in the surface 0–15 cm. It was estimated that about 4.6–5.8{\%} of the peat cation exchan e sites could be occupied by NH4+, corresponding to a NH4+ retention capacity of about 0.18 to 0.77 g kg−1 dry peat. Assuming that the retention was attributable to the 0–15 cm surface peat layer alone, the calculated NH4+ retention potential of OFA peat should have lasted under 6 months with the loadings imposed on the OFAs and the decreases in NH4+ amounts in peat mining water considered here. The actual duration of peat capacity to retain NH4+ in the OFAs has, however, already been shown in this research to be longer, and apparently will be so also in future, probably as a result of two processes: nitrification and subsequent N loss through denitrification, and biological assimilation. Hence, cation exchange capacity of OFA was an important property that contributed to surface water protection against eutrophication by N.",
author = "Kaisa Heikkinen and Raimo Ihme and Esko Lakso",
note = "Project code: YKI4332",
year = "1995",
doi = "10.1016/0883-2927(94)00049-C",
language = "English",
volume = "10",
pages = "207--214",
journal = "Applied Geochemistry",
issn = "0883-2927",
publisher = "Elsevier",
number = "2",

}

Contribution of cation exchange property of overflow wetland peat to removal of NH4+ discharged from some Finnish peat mines. / Heikkinen, Kaisa; Ihme, Raimo; Lakso, Esko.

In: Applied Geochemistry, Vol. 10, No. 2, 1995, p. 207-214.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Contribution of cation exchange property of overflow wetland peat to removal of NH4+ discharged from some Finnish peat mines

AU - Heikkinen, Kaisa

AU - Ihme, Raimo

AU - Lakso, Esko

N1 - Project code: YKI4332

PY - 1995

Y1 - 1995

N2 - The importance of adsorption on peat for decreasing NH4+ was estimated in four overland flow areas (OFA) in northern Finland, where peat mining water is purified by conducting it across a natural mire of a given size. The effective cation exchange capacity (ECEC) values of peat in the OFAs ranged from 21.4 to 92.7 meq per 100g, being generally highest in the surface 0–15 cm. It was estimated that about 4.6–5.8% of the peat cation exchan e sites could be occupied by NH4+, corresponding to a NH4+ retention capacity of about 0.18 to 0.77 g kg−1 dry peat. Assuming that the retention was attributable to the 0–15 cm surface peat layer alone, the calculated NH4+ retention potential of OFA peat should have lasted under 6 months with the loadings imposed on the OFAs and the decreases in NH4+ amounts in peat mining water considered here. The actual duration of peat capacity to retain NH4+ in the OFAs has, however, already been shown in this research to be longer, and apparently will be so also in future, probably as a result of two processes: nitrification and subsequent N loss through denitrification, and biological assimilation. Hence, cation exchange capacity of OFA was an important property that contributed to surface water protection against eutrophication by N.

AB - The importance of adsorption on peat for decreasing NH4+ was estimated in four overland flow areas (OFA) in northern Finland, where peat mining water is purified by conducting it across a natural mire of a given size. The effective cation exchange capacity (ECEC) values of peat in the OFAs ranged from 21.4 to 92.7 meq per 100g, being generally highest in the surface 0–15 cm. It was estimated that about 4.6–5.8% of the peat cation exchan e sites could be occupied by NH4+, corresponding to a NH4+ retention capacity of about 0.18 to 0.77 g kg−1 dry peat. Assuming that the retention was attributable to the 0–15 cm surface peat layer alone, the calculated NH4+ retention potential of OFA peat should have lasted under 6 months with the loadings imposed on the OFAs and the decreases in NH4+ amounts in peat mining water considered here. The actual duration of peat capacity to retain NH4+ in the OFAs has, however, already been shown in this research to be longer, and apparently will be so also in future, probably as a result of two processes: nitrification and subsequent N loss through denitrification, and biological assimilation. Hence, cation exchange capacity of OFA was an important property that contributed to surface water protection against eutrophication by N.

U2 - 10.1016/0883-2927(94)00049-C

DO - 10.1016/0883-2927(94)00049-C

M3 - Article

VL - 10

SP - 207

EP - 214

JO - Applied Geochemistry

JF - Applied Geochemistry

SN - 0883-2927

IS - 2

ER -