Diana S. Moura
Modeling phosphorus exchange between bottom sediment and water in tropical semiarid reservoirs.
Moura, Diana S.; Lima Neto, Iran E.; Clemente, Allan; Oliveira, Samylla; Pestana, Carlos J.; Aparecida de Melo, Maria; Capelo-Neto, Jos�
Authors
Iran E. Lima Neto
Allan Clemente
Samylla Oliveira
Dr Carlos Pestana c.pestana@rgu.ac.uk
Lecturer
Maria Aparecida de Melo
Jos� Capelo-Neto
Abstract
This study investigated phosphorus (P) dynamics in the sediment-water interface of three distinct reservoirs located in a tropical semiarid region. Sequential chemical fractioning of the P content in the sediment and controlled experiments of the sediment-water interface were performed to understand and model the effect of the different P fractions on the exchange dynamics under anoxic and oxic scenarios. The results revealed that the older the reservoir, the higher the amount of iron and aluminum-bound P in the sediment, and that this fraction was responsible for a 10-fold increase in P concentration in the water during anoxic conditions. After aeration, P in water decreased but did not return to its initial concentration. The most recently constructed reservoir showed the lowest P concentration in the sediment and dominance of the unavailable P fraction, resulting in no potential impact on water quality. Phosphorus release and precipitation rates were well described by zero- and first-order models, respectively. Reservoirs with high P availability in the sediment, not only released more phosphorus but also presented a lower precipitation rate, resulting in higher potential damage to water quality and making some in-lake treatment techniques ineffective.
Citation
MOURA, D.S., LIMA NETO, I.E., CLEMENTE, A., OLIVEIRA, S., PESTANA, C.J., APARECIDA DE MELO, M. and CAPELO-NETO, J. 2020. Modeling phosphorus exchange between bottom sediment and water in tropical semiarid reservoirs. Chemosphere [online], 246, article ID 125686. Available from: https://doi.org/10.1016/j.chemosphere.2019.125686
Journal Article Type | Article |
---|---|
Acceptance Date | Dec 16, 2019 |
Online Publication Date | Dec 17, 2019 |
Publication Date | May 31, 2020 |
Deposit Date | Dec 23, 2019 |
Publicly Available Date | Dec 18, 2020 |
Journal | Chemosphere |
Print ISSN | 0045-6535 |
Electronic ISSN | 1879-1298 |
Publisher | Elsevier |
Peer Reviewed | Peer Reviewed |
Volume | 246 |
Article Number | 125686 |
DOI | https://doi.org/10.1016/j.chemosphere.2019.125686 |
Keywords | Bottom sediments; Eutrophication; Internal load; Mathematical modeling; Phosphorus availability |
Public URL | https://rgu-repository.worktribe.com/output/819643 |
Files
MOURA 2020 Modeling phosphorus
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Publisher Licence URL
https://creativecommons.org/licenses/by-nc-nd/4.0/
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