Dissolved Air Flotation

DAF Unit for Industrial and Municipal Wastewater treatment

Introduction:

dissolved air flotation (DAF) A flotation machine is a wastewater treatment system that purifies wastewater (or other water) by removing suspended matter such as oil or solids.

Application:

Widely used in machinery, chemical industry, light textile, transportation, food and other industries, especially suitable for the treatment of oilfield drilling sewage, oilfield reinjection water, and oil refinery sewage.

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Working Princple

Schematic diagram of the interaction between bubbles and flocs

How it works: In a DAF unit, millions of tiny air bubbles are released from the air sparger, allowing flocculent particles to attach and float on the surface of the water.

Air is dissolved under pressure in a clean liquid, usually the effluent recovered from a DAF unit, which is then injected into the original feed stream. Upon entering the DAF unit, the air pressure is released and combined with the liquid, which becomes supersaturated and filled with micron-sized air bubbles.

The suspended matter attaches to the air bubbles, making the specific gravity of the clumps (floc) lower than that of water, thereby effectively lifting the suspended particles to the liquid surface, forming a floating sludge layer, which is periodically removed by the skimmer into the sludge tank . The clarified water flows to the bottom of the flotation cell and then to the effluent control weir for treatment or reuse.

Working principle diagram of dissolved air flotation machine

Model

Model	Flow（m3/h）	Length（mm）	Width(mm)	Height(mm)	Platform width（mm）	Recovery flow
QY-DAF-5	5	3500	1000	1700	650-800	15-30%
QY-DAF-10	10	4500	1200	2000	2000
QY-DAF-15	15	5000	1500	2000	2000
QY-DAF-20	20	5000	1800	2000	2000
QY-DAF-30	30	6000	2000	2100	2100
QY-DAF-40	40	7000	2200	2100	2100
QY-DAF-50	50	7000	2700	2100	2100
QY-DAF-70	70	9000	3000	2100	2100
QY-DAF-100	100	10500	3600	2100	2100
	Remarks:
	*To improve our system, dimensions are subject to change without notice
	*Flow rates are based on a typical rate of ascent of 6m/h. Depending on the type of wastewater, the rate of rise varies from 4 - 8m3/m2.
	*Recovery flow will vary depending on the type of wastewater, the concentration or suspended solids level in the wastewater, and the desired effluent quality at the outlet of the DAF unit.

Engineering case

Dissolved air flotation machine installation project case