 |
|
|
HUBER Dissolved Air Flotation Plant HDF |
|
|
- waste water treatment
- material recovery and
- recycling of used water
by flotation with micro bubbles
Non-clogging saturation system
Non-clogging integral lamella packages |
|
|
The (waste) water enters the flotation tank via the inlet line. There the pressure water, which is saturated with air, is introduced by means of nozzles. The micro bubbles produced on release of pressure (40-70 µm dia.) are intensively mixed with the suspended material. Gas bubbles attach to the solids forming solids/gas flocs which are lighter than water and therefore rise to the surface.
The solids/gas flocs rise to the water surface in the flotation tank and form a floating layer which is removed by the skimmer and guided into the flotate discharge hopper. Specially designed scraper bars dewater the flotate, which is then either collected in a container or further transported by an eccentric screw pump to further treatment steps (i.e. sludge dewatering RoS 3.
The lamella separator increases the effective separation surface of the plant so that its maximum admissible hydraulic load is higher than that of traditional plants of equal dimensions. The separation distances are largely reduced owing to the plate package. The final distributed solids form both bigger flotate/floc compounds on the lower side of the plates and sediment/floc compounds on the upper side of the inclined plates. From there, the compact compounds rise and become part of the floating layer and slide down into the sludge collection hopper respectively. The settled solids are discharged either by an eccentric screw pump or by gravity with pneumatic or electric valve control.
The clear water flows behind the submerged scum board into the clear water chamber from where it exits over a height-adjustable weir into the clear water outlet. The water level in the flotation tank and consequently the immersion depth of the scraper bars are adjustable by means of this weir.
A partial flow of clarified water is taken from the clear water chamber of the outlet area to be reused as pressure water. It is brought to a pressure of approx. 6 bar by means of a multistage rotary pump. Air addition is achieved with a compressor feeding directly into the rotor casing of the pump. Intensive mixing of air with the water results in a large exchange area for the liquid and gaseous phase so that the air in the water is dissolved. This pressure water is directed to nozzles below the water intake via the pressure water line and the pressure water distributor. There it is injected and the micro bubbles are released.
|
|
|
|
HUBER - WHERE QUALITY AND SERVICE SPRING TO MIND
Huber Technology UK, Units C and D Brunel Park
Bumpers Farm, Chippenham Wiltshire SN14 6NQ
Phone +44 1249 765000, Fax +44 1249 449076, E-mail: rotamat@huber.co.uk |
|
|
|
