Journal of Food, Agriculture and Environment

Comparative studies of the different mechanical oxygenation systems used in the restoration of lakes and reservoirs

Author(s):

Mustapha Gafsi ¹, Ahmed Kettab ², Saadia Benmamar ², Salim Benziada ²

Recieved Date: 2008-10-02, Accepted Date: 2009-03-25

Abstract:

The techniques used for the restoration of lakes or to prevent eutrophication are numerous (chemical, biologic, mechanical, etc). Due to their excessive costs and the relatively insignificant outcomes of some of these techniques, the process of artificial aeration is one of the most promising methods. Four strategic techniques for the control of nutrients are selected for this study: artificial destratification by the bubble plume, partial (or total) lift hypolimnetic aerator, bubble plume oxygenation and Speece cone oxygenation. Each of these methods has both advantages and disadvantages. Technical and economic analyses established by different researchers reveal that hypolimnetic oxygenation is most favorable for nutrient control. In hypolimnetic aeration systems, the bubble plume appears to be most economical and perhaps most simple among the systems proposed for Standley Lake (Colorado, USA), even as other researches selected the Speece cone aeration system in other applications. Based on existing hypolimnetic aeration research, this study provides a synthesis of a number of issues related to the aeration in lakes and reservoirs, including the advantages and disadvantages of these aeration systems. This study also concentrates on the economic and technical aspects associated with these aeration systems. We found that the use of oxygen limits the nitrogen saturation and in contrast with using air. We demonstrate that the most efficient hypolimnetic aeration system is the bubble plume diffuser, although accidental destratification may occur. The destratification can be used in winter because the temperature of the lake is not modified. However, the hypolimnetic aeration is used in summer in order to avoid the homogenization of the lake temperature during this period.

Keywords:

Aeration, eutrophication, destratification, hypolimnetic aeration, temperature, dissolved oxygen, pollution, thermal stratification, restoration techniques, lake

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Journal: Journal of Food, Agriculture and Environment
Year: 2009
Volume: 7
Issue: 2
Category: Environment
Pages: 815-822

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