Diffused Reservoir Aerators

Diffusing reservoir aerators that entrain water - Heathland Aquatic Engineering Norfolk Suffolk UK

It’s all about entraining* water in your reservoir

* To entrain means to draw in and transport.

This starts with our range of diffused aerators. At Heathland Aquatic Engineering we have a range of diffusers available offering both tube or disc style diffuser membranes. Tube style diffuser membranes entrain water from 360° around the tube, allowing them to reach deeper water while the height of the diffuser base prevents them from disturbing the actual reservoir bottom. Disc style diffuser membranes entrain water from the top of the membrane up through the water column.

Why is entraining water in Reservoir Aeration so important?

Thermal stratification is the layering of water and this generally happens in the summer. The top layer of the reservoir consists of warm oxygen rich water and the bottom layer is a cooler, oxygen deprived layer. The middle transitory section between these two is known as the thermocline. The differences in density at the thermocline is the reason these two layer do not mix.

It all has to do with the mixing and blending of the water column

Diffused aeration units are designed to pump air through the diffuser membranes, which is then able to make its way up to the reservoir surface in the form of millions of tiny  bubbles. As these bubbles travel up through the layers of thermal stratification they entrain water and this water is then brought up to the surface layers of the reservoir where it becomes naturally oxygenated and so the water in the reservoir is aerated.

This aeration process creates aerobic conditions near the reservoir base where microbial process can naturally break down nutrients that would otherwise be used in the production of noxious aquatic weeds and algae. By circulating and aerating from the reservoir base upwards, the toxic gases that would normally be trapped underneath the thermocline layer are released, providing a balanced habitat for aquatic life.


Thermal stratification in reservoirs - aeration for reservoirs - Heathland Aquatic Engineering Norfolk UK


Key features to using diffused aeration systems in your reservoir;

  • Breaks up thermal stratification layers throughout the water column allowing the entire water column to be oxygenated, eliminating highs and lows in both temperature and oxygen levels.
  • Increases the breakdown of aquatic waste by providing a habitat beneficial for aerobic bacteria to flourish.
  • When operated continuously in freezing climates, these pumps will keep areas of the ice open letting toxic gases escape and thereby increasing the oxygen level in the water.
  • Operating throughout winter will  keep areas of frozen reservoirs open allowing birds and other wildlife to gain much needed water they need during freezing conditions.

Click on the images or links below to see our range of diffused reservoir aerators.