Controlling the Growth of Microcystis Using Surged Artificial Aeration

International Review of Hydrobiology - Tập 84 Số 3 - Trang 243-254 - 1999
Karl‐Erich Lilndenschmidt1
1Umweltforschungszentrum, Projektbereich Fluß‐ und Seenlandschaften, Brückstraße 3a, 39114 Magdeburg, Germany

Tóm tắt

AbstractThis paper investigates the effect of lake mixing, due to artificial hypolimnetic aeration, on the succession and ecological composition of selected phytoplankton species in Tegeler See, Berlin. Special attention is given to Microcystis, a nuisance bloom‐forming blue‐green algae and its competitor (in this lake) Ceratium, a dinoflagellate. Due to the installation configuration, the aerators frequently destratified the lake, especially when the stratification was weak. Five years representing three different operating schemes of the 15 aerators (continuous aeration, non‐aeration and surge aeration) in this lake were used to determine possible aeration strategies in controlling Microsystis. In order to ease correlation of the mixing status in the lake with its yearly successions of phytoplankton growth a non‐dimensional parameter called the Lake number was utilised. This parameter represents a balance between: i) forcing due to wind and aerator discharge and ii) potential energy acquired from the stratification of the lake. The results indicate that surged operation of the aerators is effective in suppressing massive growth of Microcystis. Due to their ability to adapt to the mixing/stability state of the water column, prolonged aeration or prolonged stable stratified conditions have little effect in controlling this algae.

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International Review of Hydrobiology

Tập 84 Số 3

243-254

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