Dissolved air flotation unit Flottaflo ®

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.

Operating principle

  • 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.

MAXIMUM REMOVAL
PHYSICAL FLOTATION :

GREASE : 85%

BOD5 and COD : 45%

SS : 85%

MAXIMUM REMOVAL
PHYSICAL-CHEMICAL FLOTATION :

GREASE : 95%

BOD5 and COD : 75%

SS : 95%

MAIN APPLICATIONS

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

SPECIFICATIONS

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.

BENEFITS

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

Download this product’s specifications

Download

Contact an R&O engineer

Contact