A theoretical basis for the operational condition of hypolimnetic aerators is described. The widely observed increase in hypolimnetic oxygen demand during aeration is ascribed to enhanced sediment oxygen demand due to induced circulation currents. The present model enables quantitative prediction of dissolved oxygen and phosphate concentrations during hypolimnetic aeration. Simple mass balance in the hypolimnoin shows a necessary condition to halt phosphate release. A time scale of changes in oxygen concentration is also discussed. These results will assist in designing an aerator and selecting an optimum operational condition.

Aerator design, diffusive layer, hypolimnetic aeration, lake restoration, oxygen depletion, phosphate release, sediment oxygen demand
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© IWA Publishing 1996
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