* 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.