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Evaluation of aluminum treatment efficiency on water quality and internal phosphorus cycling in six Danish lakes.

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Název: Evaluation of aluminum treatment efficiency on water quality and internal phosphorus cycling in six Danish lakes.
Autoři: Jensen, Henning, Reitzel, Kasper, Egemose, Sara
Zdroj: Hydrobiologia; Jun2015, Vol. 751 Issue 1, p189-199, 11p
Témata: PHOSPHORUS cycle (Biogeochemistry), WATER quality, ALUM, LAKE restoration, SEDIMENT capping, LAKES
Geografický termín: DENMARK
Abstrakt: If dosed sufficiently relative to the pool of excess phosphorus (P) in the lake sediment and lake water, aluminum (Al) is hypothesized to block sediment P release and thereby improve water clarity in eutrophic lakes. Aluminum has been used in >200 lakes worldwide, but in some 30% of the known cases water clarity did not improve beyond the first year, likely because of underdosing or continued high external P loading. We evaluate the viability of the aluminum dosing hypothesis for six Danish lakes that received Al in a molar ratio of <2-10 relative to the potentially mobile P pool. Lake water total P declined to values that could be predicted from the external P loading but increased again in the two lakes receiving the lowest Al doses. Lasting (>2-3 years) improvement of water clarity was only observed in two lakes. Sediment P release rates, which were measured in four lakes, declined significantly but then increased gradually again in the two lakes receiving the lowest doses. We conclude that if external P-loading is sufficiently low, lasting improvement of water quality can be obtained if Al is dosed 10:1 or higher relative to the size of the mobile P pool. [ABSTRACT FROM AUTHOR]
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Databáze: Complementary Index
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Abstrakt:If dosed sufficiently relative to the pool of excess phosphorus (P) in the lake sediment and lake water, aluminum (Al) is hypothesized to block sediment P release and thereby improve water clarity in eutrophic lakes. Aluminum has been used in >200 lakes worldwide, but in some 30% of the known cases water clarity did not improve beyond the first year, likely because of underdosing or continued high external P loading. We evaluate the viability of the aluminum dosing hypothesis for six Danish lakes that received Al in a molar ratio of <2-10 relative to the potentially mobile P pool. Lake water total P declined to values that could be predicted from the external P loading but increased again in the two lakes receiving the lowest Al doses. Lasting (>2-3 years) improvement of water clarity was only observed in two lakes. Sediment P release rates, which were measured in four lakes, declined significantly but then increased gradually again in the two lakes receiving the lowest doses. We conclude that if external P-loading is sufficiently low, lasting improvement of water quality can be obtained if Al is dosed 10:1 or higher relative to the size of the mobile P pool. [ABSTRACT FROM AUTHOR]
ISSN:00188158
DOI:10.1007/s10750-015-2186-4