The Influence of Whole Lake Aeration on the Limnology of a Hypereutrophic Lake in Central Florida

24 Feb

Excerpt from: The influence of whole lake aeration on the limnology of a hypereutrophic lake in central Florida

Prepared by: Bruce C. Cowell, Clinton J. Dawes, William E. Gardiner & Sandra M. Scheda. Department of Biology, University of South Florida, Tampa, FL 33620, USA

Abstract

We closely monitored the physical-chemical and biological parameters of a small sinkhole lake, in order to determine the influence of multiple inversion aeration systems, for 15 months prior to starting aeration as well as 24 months thereafter. Our observations determined that aeration eliminated thermal stratification and dissolved oxygen concentrations of bottom waters during aeration increased significantly. In addition, the total volume of phytoplankton cells decreased 2-fold.

Introduction

Many lakes throughout the world are undergoing accelerated aging or eutrophication. The deteriorating water quality is due to man’s activities such as the influences of agricultural, industrial and domestic pollutions, these activities also affect phytoplankton blooms, oxygen levels, fish kills and sediment infilling. Limnologists, in recent years, have attempted to reverse the eutrophication with various lake restoration methods, which limit fertility and sedimentation or attempt to control the consequences of eutrophication.

Conclusions

Clean-Flo’s multiple inversion aeration system successfully eliminated some of the undesirable consequences of eutrophication. However, it did not decrease the trophic state index or produce a significant decreased of the extensive layers of flocculent sediment. Thus, leading to the conclusion that aeration of hypereutrophic lakes may be necessary for multiple years in order to maintain desired conditions.

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