landiaworld.com ENGINEERED TO LAST No. 435 – Mixers Mixers meet need for true aeration By Soren Rasmussen, Director, Landia, Inc. Dealing with solids in aeration tanks requires careful consideration for performance and longevity – because looks can be deceiving. At first glance, there can often appear what seems to be plenty of aeration activity in an effluent tank, but in reality, there is sometimes very little happening that is beneficial to the process. Outdated equipment, such as old surface aerators, can busily create ‘a dancing tank’ with lots of noise and bubbles. However, this type of equipment is only capable of aerating the top part of the tank - often as little as 20% of the total volume. Therefore, despite all the bubbling commotion, solids can and do settle o

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