Dissolved Air Flotation PCL type

The K-Pack flotation units are designed to remove solids, oil, grease and/or flocs from the wastewater which do not have sufficient buoyancy to float.
The PCL units are designed to treat large wastewater flows from 225 up to 650
m3/hour per unit.

Process description
The PCL flotation unit is executed with a combination of a cross flow and counter current plate pack. Due to this plate pack the internal surface is increased, which results in a very stable and laminar flow through the unit. Under these circumstances optimal separation of flocculated materials takes place.

The wastewater enters the flotation unit through a distribution system where air is added to the wastewater. At elevated pressure, the air will dissolve in the water. Next, the pressure will be reduced to atmospheric pressure. This reduction causes the dissolved air to form micron size air bubbles. These bubbles will be formed on or will attach to suspended materials, increasing the buoyancy, which make them float to the surface of the flotation unit.

Here they will be removed by a unique sludge discharge system containing a skimmer with static sludge thickener. This results in a high dry solids load of the floating sludge.

Sand and other settling materials are removed by the bottom screw which is placed over the full length of the base.

All PCL flotation units consist of a stainless steel vessel (standard AISI 304, other materials are possible) with supporting steelwork and stiffeners. The unit is standard executed with a plate pack, skimmer system, auger, static sludge thickener, recirculation system complete, automatic sedimentation discharge
valve, pneumatic control panel and electric control panel.

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