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Layer Aeration

Overview

Layer Aeration: (Innovative Technology Award presented by USEPA-NE) Layer Aeration circulates and aerates specific depth layers in a reservoir or lake. The method takes advantage of oxygen produced by plants in upper waters to offset the demand for oxygen in deeper water. Hence, power requirements and costs are substantially lower than other aeration approaches. (US Pat 4,724,086) The method is especially beneficial for:

  • High Quality Withdrawal Layers for Raw Supply Water Withdrawal
  • Restoring Cold Water Habitat (for cold water fish and as zooplankton refuge)
  • Reducing internal nutrient cycling which stimulates blooms of bluegreen algae

Help your lake to Aerate Itself!

Layer Aeration is most applicable in deeper lakes where oxygen loss ascends above the thermocline and results in significant loss of cool water habitat (for cold water fish and zooplankton refuge), and internal nutrient loading that stimulates bluegreen algae blooms. It is especially useful for coldwater fishery habitat restoration, water supply quality (when several vertical intake gates are available), and in lakes which exhibit very high areal oxygen demand. Layer aeration “adjusts how stratification develops”, but does not destratify the water column.

Layer Aeration establishes a mixed aerated water layer in the middle of the water column, typically from the bottom of the epilimnion to several meters down into the hypolimnion. The layer is bounded above and below by thermoclines. The thickness of the aerated layer and vertical positioning is designed specifically for a particular lake in order to utilize photosynthetic oxygen production above the compensation depth, maintain aerobic conditions over a large bottom area, maintain water quality at the depth of water supply withdrawal gates, and reduce the area and volume of the deepest hypolimnion. The smaller hypolimnion remains isolated, and can have some oxygen input to maintain a higher oxidation-reduction potential to prevent hydrogen sulfide accumulation and operate the deepest bottom area in the nitrogen and iron cycle very efficiently.

If you were to take 10 Million Gallons per Day (MGD) of water at 24 degrees and 8 mg/L dissolved oxygen, and mix it with 10 MGD of water at 14 degrees and 2 mg/L oxygen, and return it between the two vertical withdrawals, what would get? ......20 MGD of Layer Aeration!

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