Pond Aeration

Aeration and Dissolved Oxygen

Most aquatic organisms (fish included) are totally dependent on Dissolved Oxygen (DO) — that is, the amount of oxygen that can be held in solution. Atmospheric pressure, temperature and salinity collectively determine the amount of DO in water, which is contributed by atmospheric diffusion at the surface and by photosynthesis from water plants.

Where natural processes are insufficient, artificial means to influence oxygen levels, such as aeration, need to be sought.

When Oxygen meets Bacteria

Algae thrive in lakes and ponds that suffer from a build-up of nutrients (Eutrophication) – typically as a consequence of sediment washed into the water as run-off from the surrounding land. This is often heavily contributed to by leaf litter, agricultural activity, property development and human recreation.

Through aeration, oxygen becomes available to aerobic bacteria in the sediment which helps to break it down. In turn, nutrients are reduced, restricting algal growth. Meanwhile DO remains available to fish, invertebrates and other aquatic organisms.

Ultimately a continual build-up of sediment and organic matter without any mechanical or biological intervention would eventually cause a lake or pond to dry out. This is the first stage of a natural process known as ecological succession.

Aeration as a solution promotes a wealth of ecological benefits, especially to water bodies maintained as an amenity.

The implications of water aeration

Under the right circumstances, aeration can bring a multitude of benefits to a water body, but it is not a solution to every issue. It's important to understand what the results of aeration are likely to be before installation, so if you have any questions at all, we would be glad to help.