Prevent Fish Kill

Fish kills typically occur at times of sudden complete whole-lake mixing following a period of extended stratification. During periods of stratification – during summer months or under ice during winter – bottom waters can become depleted of dissolved oxygen (DO). Under these anoxic conditions, hydrogen sulfide (H2S) can accumulate in bottom waters. Both anoxic waters and H2S are toxic to fish. If the volume of anoxic water is relatively large, a fish kill can occur when a pond or lake completely mixes (e.g., fall turnover, spring turnover, or a summer storm event). SolarBee circulation can help prevent fish kills by preventing blue-green algae blooms (whose death and subsequent decomposition are a major cause of bottom water DO depletion), and by improving the distribution of DO throughout the water column.

Setting the SolarBee hose deep for hypolimnetic circulation has shown effective at addressing these water quality issues. Hypolimnetic oxygenation involves bringing up oxygen-poor water to the surface for natural re-oxygenation via transport across the air-water interface and from algal photosynthesis. At the same time, oxygen-rich water gets transported downward to the depth of the SolarBee intake hose through displacement. This method of deployment is most frequently used in drinking water supply reservoirs to prevent taste and odour problems. Keeping deep waters below the level of the intake pipe to the water treatment plant well oxygenated effectively prevents odour-causing Mn and H2S intrusions into the plant.

Prevent accumulation of Mn, Fe, H2S and methyl-Hg


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