Influence of Phoslock® on legacy phosphorus, nutrient ratios, and algal assemblage composition in hypereutrophic water resources.
Environ Sci Pollut Res Int
; 25(5): 4544-4557, 2018 Feb.
Article
em En
| MEDLINE
| ID: mdl-29188598
ABSTRACT
Acceleration of eutrophication in freshwater resources can result in prolific growth of nuisance algae, notably cyanobacteria. In this research, we evaluated the ability of an in situ P binding technology (Phoslock®) to alter available water column and sediment P, and the subsequent impact on nutrient ratios and algal assemblage composition. Two golf course irrigation ponds with legacy nutrient loads and chronic cyanobacterial blooms were treated with Phoslock and monitored for 2 years post-treatment. Phoslock significantly (P < 0.05) decreased water column total P levels and shifted mobile sediment P fractions (i.e., labile, reductant-soluble, organic) to the residual fraction. Total N/P ratios (by mass) significantly increased and were sustained at over 301 in the Hickory Meadows irrigation pond and 1001 in the Chockyotte irrigation pond throughout the study. Consequent changes in the algal assemblage included decreases in dominance and overall density of cyanobacteria as well as a shift away from scum-forming genera (e.g., Microcystis spp. and Anabaena [Dolichospermum] sp.) to planktonic forms (e.g., Pseudanabaena sp. and Planktolyngbya sp.). This research provides information regarding mitigation of in situ water and sediment P toward shifting nutrient ratios and altering algal assemblage composition.
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Texto completo:
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Base de dados:
MEDLINE
Assunto principal:
Fósforo
/
Poluentes Químicos da Água
/
Lagoas
/
Cianobactérias
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Eutrofização
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Recuperação e Remediação Ambiental
País/Região como assunto:
America do norte
Idioma:
En
Revista:
Environ Sci Pollut Res Int
Ano de publicação:
2018
Tipo de documento:
Article
País de afiliação:
Estados Unidos