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Tank aeration and circulation systems combine our aeration technology with a circulation of the tank content to achieve maximum conditioning performance. Besides keeping the sewage in aerobic condition (no risk of hydrogen sulphide (H2S) or sulphuric acid (H2SO4) formation, support of natural biological processes), these systems also effectively prevent sedimentation. When tank contents develop sediments, the suspended solids concentrate in the lower layers and the dissolved solids in the upper layers.

When the “thick” lower layers are fed into the STP, there is the risk of clogging the sludge compartment, cleaning nozzle and sensors inside the STP. When the “thin” upper layers are fed into the STP, the Dissolved Air Flotation (DAF) may not perform properly as it relies on a good balance of suspended solids and dissolved solids in the influent sewage mix for the process. We recommend tank aearation and circulation systems for all tanks with high solids concentrations, primarily the sewage mixing tank and black water holding tanks. The longer untreated sewage is to be stored in a tank, the more important a tank aeration and circulation systems gets.

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