Evaluation of Eutrophication Control Through Hypolimnetic Oxygenation

The accumulation of nutrients in water bodies occur due to excessive phosphorus and nitrogen loads from the catchments and other external sources, causing buildup of nutrients in sediments. Often, water bodies that present thermal stratification, experience depletion of dissolved oxygen (DO) in the...

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Bibliographic Details
Published in:Procedia earth and planetary science 2017, Vol.17, p.598-601
Main Authors: Hansen, Anne M., Hernández-Martínez, Claudia, Falcón-Rojas, Axel
Format: Article
Language:English
Subjects:
Eutrophication control
Hypolimnetic oxygenation
Internal load
Oxygen demand
Water and sediment respiration
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Summary:The accumulation of nutrients in water bodies occur due to excessive phosphorus and nitrogen loads from the catchments and other external sources, causing buildup of nutrients in sediments. Often, water bodies that present thermal stratification, experience depletion of dissolved oxygen (DO) in the hypolimnion, thereby causing anoxic conditions, favoring the release of nutrients and leading to eutrophic conditions. The use of hypolimnetic oxygenation systems (HOS), which can supply over 50mg/L of DO in the hypolimnion of deeper water bodies, has demonstrated to reverse these conditions in lakes and reservoirs in North America, Europe, and Australia. The objective of this study was to develop a model for forecasting the remediation progress of a eutrophied reservoir using HOS. For this purpose, a mass-balance model was developed that calculates the oxygen accumulation in water bodies, using experimentally obtained oxygen demand (OD) of water and sediment from the reservoir, the extracted OD, the external load of OD, DO provided by natural sources such as photosynthesis and interaction with the atmosphere, and DO supplied by the HOS. The model was applied to forecast DO concentrations in the hypolimnion of a Mexican reservoir under different scenarios of external load of OD and hypolimnetic oxygenation.
ISSN:1878-5220
1878-5220
DOI:10.1016/j.proeps.2016.12.159