Odor Mitigation In Very Deep (Hypolimnetic) Ponds

Your Lake Odors May Be A Deeper Problem Than You Think


underwater imageIt is rare hypolimnetic odors are an issue in small lakes and ponds as they tend to be shallower in nature; however, there are cases when ponds with small surface acreages are exceptionally deep.

Dissolved oxygen (DO) is an essential component of water chemistry, required by most aquatic life for the oxidative breakdown of organic matter to gain energy for metabolic processes. Oxygen gets into a lake primarily by diffusion across the air-water interface, and by photosynthetic production from algae and submersed aquatic plants. DO depletion due to respiratory requirements of bacteria, algae, zooplankton, fish, etc. occurs throughout the water column, but is more concentrated in deeper, dark waters and bottom sediments where organic matter and detritus accumulate and DO inputs are minimal.  Algae that sink to the bottom deplete available dissolved oxygen (DO), enabling the formation of hydrogen sulfide (H2S) that produces a rotten egg odor when exposed to air. Thermal stratification during summer months, and under ice during the winter, allows H2S to accumulate in bottom waters that can create a significant odor event (and potential fish kill) with lake turnover in the fall and ice-out in the spring.


Hypolimnetic oxygenation keeps bottom waters sufficiently oxic so that H2S does not accumulate significantly in bottom waters.


SolarBee® long-distance circulation moves water both horizontally and vertically.  By setting the intake hose into deeper waters below the thermocline, the deep circulation provides hypolimnetic oxygenation, reduces hydrogen sulfide accumulation in anoxic bottom waters, and is beneficial for fishery improvement.

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