Flottaflo - Dissolved Air Flotation (DAF) Unit
After the sieving stage, the wastewater is sent into the flotation unit. Micro-bubbles are injected under pressure into the liquid. These microscopic bubbles with a diameter of between 20 and 50 μm activate the flotation and raise the grease particles to the surface, forming a layer of scum to be scraped off.
- It is a given that air diffusion improves the phenomenon of gravitational separation. The air bubbles are fixed to the particles through the effect of surface tension, an effect that is all the more pronounced the smaller the bubble.
- The flotation unit performance can be improved by adding a physical-chemical treatment (coagulation, flocculation) upstream.
PRETREATMENT OF WASTEWATER
Food industry :
- Abattoirs
- Meat processing
- Dairy
- Cheese factories
- Patisseries
Other industries :
- Biotechnologies
- Cosmetics
- Chemicals
- Paper works
- Textiles
- Sludge thickening
- Tertiary sewage treatment
R&O Dépollution offers a wide range of processes able to treat throughputs of between 2 m/h and 200 m/h, for a scraped surface of 1.8 to 22 m² and a volume of 1.5 to 39 m3 (complete dimensional data sheet available for further data).
The dimensions of the flotation unit depend on the characteristics of the effluent, the hydraulic head, the mass load and the retention time in the flotation unit. The suspended solids (SS) load must be below 12 kg/m3/h for grease removal applications and below 6 kg/m3/h for sludge thickening.
- Small footprint
- Cost-effective
- Easy to install and implement
- High reliability of the CE-certified pressurisation system
- Extremely easy adjustment, commissioning and operation
- Robustness: 304 or 316 L stainless steel
- Possible full process