Technical 0O 90O 180O 270O 360O (a) Single‐phase sine wave consisting of 360O Phase A Phase B Phase C 0O 120O 240O 360O


One of the greatest benefits of a diffused air system is that it neither uses any moving parts nor electricity in the water and, for these reasons, it’s one of the most popular aeration devices for large ponds and lakes that are at least 4.5m deep


(b) Three‐phase sine wave: each sine wave is 120O Figure 1: single-phase vs. three-phase power


creating circulation and de‐stratifying the pond, but they also replenish the oxygen supply throughout the water, and this allows for aerobic bacteria to rid the pond of noxious gases such as hydrogen sulfide and ammonia. Moreover, on the surface of the lake, the bubbles create a smooth rippling effect which deflects sunlight from reaching the pond bottom, thus deterring algae growth.


As with any type of aerator, efficiency depends on a few factors. In this case, the most influential are the size of the bubbles being dispersed and the depth of lake, which should be 4.5m deep or greater.


Bubble size


As a general rule of thumb, researchers agree that the smaller the bubble, the more effective the system. This is primarily due to the fact that smaller bubbles tend to stay in the water longer, creating a greater residual effect and spreading across a greater surface area of the water while rising to the surface. On the other hand, larger bubbles tend to rise to the surface quicker and, as opposed


to a smaller bubble, leave less time for oxygen to dissolve in the water. The motion of bubbles to the pond surface has the capacity to move an enormous amount of water, estimated between 5000‐8000 pounds per hour. Water circulation will increase as the depth increases, which means the greater the depth of the pond or lake, the better the water will be mixed and aerated. Scientists have determined that the peak efficiency depth is 15ft and studies indicate that, for every three foot decrease in depth, the system's relative efficiencies drop by about 50 percent.


Proper placement of the diffuser is also highly relevant to the effectiveness of aeration, however this matter is very site‐ specific. Since most ponds have varying depths and many are designed with what are called ‘dead spots’, it’s sensible to have a professional examine the site to determine where to place the diffuser so it will be both efficient and effective.


One of the greatest benefits of a diffused air system is that it neither uses any moving


Reg Varney, international sales manager at Otterbine


SPPS - World Class Ground Care


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 


echneat PC JUNE/JULY 2018 I 123


parts nor electricity in the water and, for these reasons, it’s one of the most popular aeration devices for large ponds and lakes that are at least 4.5m deep. So, as the temperature rises, there’s no need to despair; there’s plenty that can be done.


Otterbine’s sole UK distributor, Reesink Turfcare, can be contacted via info@reesinkturfcare.co.uk


out of phase with the next ”


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