Abstract
| Original language | English |
|---|---|
| Pages (from-to) | 207-214 |
| Journal | Applied Geochemistry |
| Volume | 10 |
| Issue number | 2 |
| DOIs | |
| Publication status | Published - 1995 |
| MoE publication type | A1 Journal article-refereed |
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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 journal › Article › Scientific › peer-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 -