Flotation is a separation process consisting in the generation and injection of microbubbles of gas into a liquid containing particles: bubbles attach to the particles and, like buoys, drag them to the surface to form a foam which is scraped off.
The principle is simple. Putting it in practise much less.
We started to study this process in 1991 to finally design a unit that now meets, as far as possible the expectations in terms of:
This was obtained after a great deal of research and testing on all the stages of the process:
Our range of flotation units SERDAF includes the following models:
All our models are equipped with the air dissolution system and micro bubble generator SERKIT assembly
This SERKIT can be sold separately to transform any static separator, equipped with a surface scraper and a bottom purge, into a dissolved air flotator.
These kits SERKITgenerate air microbubbles of 10 and 100 microns in diameter that cling to the particles contained in the water to be treated, to drive them to the surface.
They are designed to dissolve as much air as possible in the water and form bubbles as small as possible, while requiring minimum maintenance.
A pressurization pump sucks up part of the clean water leaving the flotation unit. Precisely dosed air is injected at the pump outlet. The rise in pressure causes the air to dissolve in the water. The flow passes through a reservoir in which the dissolution continues and where the excess air is purged.
The pressurized water is sent to the raw water inlet line in the flotation unit, where sudden depressurization generates what is known as “white water”. This milky appearance is the result of the appearance of myriads of microbubbles which allow the separation of the particles.
The choice of the model, the sizing of the flotation unit and the pressurization kit are made by our engineers in agreement with the customer, according to the flow rate of the water to be treated, the nature and the load of suspended solids and the BOD (Biological Demand in Oxygen).
The particularity of our dissolved air flotation units SERDAF are their efficacy, fiability and minimal operation requirements.
Extend the possibilities of your equipment.
For the SERDAF FPmodel, the lamellar pack is of the embossed polypropylene type
SERTAM rotary sieve at the inlet with piping for connection to the float
316L stainless steel construction. Pneumatically operated valve for draining sediment Electric panel
From a hydrodynamic point of view each of the models is made up of 3 zones:
The surface foams are swept up by scraping into a recovery chute, ie:
In every DAF model, sediments accumulate in the bottom hoppers of the flotation tanks.
They are extracted: