For the formation of microbubbles, the AS-FLOT equipment types use a specially designed pump, which sucks-in air automatically during the pumping action. Because of this, no compressor and/or other connected equipment is necessary. Owing to this design, the AS-FLOT units are energetically and operationally undemanding as well as highly reliable…
For the formation of microbubbles, the AS-FLOT equipment types use a specially designed pump, which sucks-in air automatically during the pumping action. Because of this, no compressor and/or other connected equipment is necessary. Owing to this design, the AS-FLOT units are energetically and operationally undemanding as well as highly reliable.
Principle of the flotation technology
The flotation technology principle is based on a separation process, which is used for separation of dispersed particles (either solid or fatty matter) from liquids by the use of air microbubbles. During the flotation process, polluting particles are attached to air microbubbles and consequently brought to the water surface together, where they form flotation foam. This foam is subsequently drawn off the water surface by a wiping device. This principle is particularly suitable for cleaning of water types containing fatty substances. The flotation process is efficiency further enhanced by the use of chemical precipitation before the flotation process itself.
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Applications
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Advantages
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Up to the capacity of AS-FLOT 7.5, the flotation units can be supplied in a container version – the product type: AS-ISO FLOT. The container is provided with completely installed and interconnected equipment for wastewater pre-treatment operations with the use of the flotation unit. Once the connections among the underground tanks and the container flotation unit are complete, the unit can be operated immediately. 
Container advantages
| Standard container fittings and mountings • Flotation unit, incl. accessories • Mechanical pre-treatment • Chemical pre-treatment • Electrical panelboard, incl. control system |
Optional equipment possibilities • Flotation foam withdrawal pump • Other electrical drives connected to the central panelboard of the container flotation unit • Fixtures and fittings for underground tanks (such as screen basket, pumps, stirrers, strain gauges, etc.) |
The flotation unit is designed as a part of the wastewater pre-treatment process. An example of the flotation unit use is given in the process flow diagram below.
From the pumping station, wastewater is pumped over the mechanical pre-treatment section to the accumulation tank, where it is homogenised. From the accumulation tank, the water stream is uniformly pumped over the chemical treatment section to the flotation unit. After the chemicals are dosed in, pollutants partially tend to agglomerate (forming the socalled flocculi) that are separated in the flotation unit by air microbubbles and subsequently brought to the water surface as flotation foam.
The flotation foam and sediments from the flotation unit are merged to the sludge tank. The pre-treated water stream from the flotation unit is either discharged into a sewer system or brought to a biological (final) treatment plant.
From miniature-scale work in the workshop to installation at an elevation of 1,740 meters above sea level.
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5. 8. 2026
Based on the requirement to verify the possibility of the WWTP function during a long-term shutdown, especially for recreationally inhabited objects with a long seasonal break, we tested the wastewater treatment plant for these modified operating conditions.
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15. 4. 2026
And how long will the purifier last?
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24. 7. 2025
