Dissolved Air Flotation

Dissolved air flotation can be used to remove suspended solids and oil & grease. In the wastewater, when the SS and O&G are removed, the BOD, COD and TSS and be reduced at the same time. It is widely used in textile, paper making, slaughter house, food, chemical industry wastewater treatment.

Description

Technical Data

SpecificationDAF-005DAF-010DAF-015DAF-020DAF-030DAF-040DAF-050DAF-080DAF-100DAF-200
Treating Capacity (m3/hr)510152030405080100200
Power Consumption (KW)Dissolved Pump3333.753.7555.57.51118.5
Air Compressor0.550.550.550.550.750.751.51.52.24
Skimmer0.10.10.10.10.20.20.20.40.40.4
Coagulate Agitator0.550.550.550.550.550.550.550.550.550.55
Flocculate Agitator0.550.550.550.550.750.750.751.11.11.1
PH Agitator0.550.550.550.550.750.750.751.11.11.1
External Dimensions (mm)L36004000490058006100690076008700950017600
W1700200023502350280028002800340038003800
H1850200021402140226022602260242024202720
Reference Weight (kgs)24902980365048505380578063508500980018500

Features

  • Design load rate 10m3/m2.h
  • Retention time 25 – 30 mins
  • Reflux ratio 30% – 50%
  • Vessel pressure 0.4 – 0.5Mpa
  • Air-water ratio 3% – 5%

Work Process


The wastewater enters RT1 (coagulation reaction tank) and RT2 (flocculation reaction tank) from the equalization tank through the lift pump, and coagulates with PAC flocculate with (PAM) respectively from the flocks.

Then the wastewater and dissolved water enter the reaction zone of the DAF tank, and the microbubbles and flocs in the dissolved water are mixed and adhered to form solid particles, which the density less than water, and float up to the surface of the DFA tank.

Under the action of buoyancy, scum is scraped to the slag tank, The clean water is collected down to the collection tank through the water collecting pipe, and most of the outer water is discharges (or into the next process), and a small part of the water is recirculated to from the dissolved water.