Dissolved Air Flotation

In the water treatment process, solid-liquid separation and its equipment are one of the key projects. Dissolved air flotation is one of the most effective methods whose specific gravity is close to 1.0 from water.

Dissolved Air Flotation Introduction

Dissolved Air Flotation EquipmentDissolved air flotation is one of the most effective methods whose specific gravity is close to 1.0 from water.Dissolved Air Flotation is liquid/solid or liquid/liquid separation process to remove tiny suspended solids that density close to the water, colloid , oil and grease etc. Benenv dissolved air flotation is an innovation combined with traditional dissolved air flotation concept and modern technology.

Features

● Small footprint, lower energy consumption; easy operation and simple management

● High efficiency of dissolved air, stable treatment effects. Electro-mechanic instruments are integrally controlled

● This equipment’s dissolved air efficiency reaches up to 90%. But its volume is only one fifth of the ordinary dissolved air system. Moreover, it has stronger anti-clogging capability than other DAF

● This equipment uses new type dissolved air releaser with the advantages of high releasing degree and self-cleaning functions. And the average particle size of micro bubbles is about 15~30μm

● This equipment uses chain-plate-type skimmer with advantages of stable operation and high efficiency of scraping

Dissolved Air Flotation Jobsites

Structures and Its Working Processes

DAF consists of flotation tank, dissolved air system, reflux pipe, dissolved air released system, skimmer (Based on customer needs, there are combined type, traveling type and chain-plate type to choose.), electric cabinet and so on.

Air flotation separation technology dissolves air into water at certain working pressure. In the process, pressurized water is saturated with dissolved air and is discharged into a flotation vessel. The microscopic air bubbles produced by released air attach to suspended solids and float them to the surface, forming a sludge blanket. A scoop removes the thickened sludge. Finally, it complete purifies the water.

Air flotation technology plays an important in solid-liquid separation (Simultaneously reduce COD, BOD, chroma, etc). Firstly, mix flocculating agent into raw water and stir thoroughly. After the effective retention time (lab determines the time, dosage and flocculation effect), the raw water enters into the contact zone where microscopic air bubbles adhere to the floc and then flows into the separation zone. Under the buoyancy effects, the tiny bubbles float the flocs to the surface, forming a sludge blanket. A skimming device removes the sludge into the sludge hopper. Then the lower clarified water flows into the clean-water reservoir through the collecting pipe. Some of water are recycled to the flotation tank for the air dissolving system, while others will be discharged.

Dissolved air flotation Principle


Application

The aim is to separate the fine suspended solids in water, algae and micro-floc.
● Separate or recycle waste oil or grease in : oil exploration and refining, biodiesel, machining , food production and catering and so on.
● High concentration organic wastewater treatment: paper, printing and dyeing, textile, leather, pharmaceutical, fermentation wastewater and so on.
● Biochemical effluent liquid separation: the anaerobic effluent solid-liquid separation, aerobic (activated sludge process, contact oxidation, filter) biochemical water solid-liquid separation, the secondary settling tank Effluent treatment and so on.
● Farm and slaughter house wastewater treatment: cattle, pigs, chickens farm, slaughter house wastewater.
● Manufacturing waste: electroplating, painting, etc.
● Purification: river, landscape, recycle water and so on.

Characteristics Advantages

Core technology

● Micro-bubble generation technology
● Forth circulation and flocculation technology


Characteristics and Advantages

● Overall specialized, compact structure, and high performance
● Huge markets ,high maturity, stable performance and reliable operation
● Hydraulic load: 3 ~ 5 m³ / (m².h)
● Maximum inlet SS concentration is ≤ 1000 mg/L
● Automatic scum discharge, solid content can be up to 30 ~ 100 mg/L
● Applied for the wastewater with suspended solids & floc density lighter than water or close to the water and weak precipitation phenomenon

Parameter

Dissolved Air Flotation Drawing

Model

Capacity

Power(kw)

Dimension(m)

Pipe connection(DN)

(m³/h)

Recycle pump

Air compressor

Skimming system

L/L1

W/W1

H/H1

(a) Water inlet

(b) water outlet

(c) sludge outlet

BNDAF-002

~2

0.75

0.55

0.2

3.2/2.5

2.4/1.16

2.2/1.7

40

40

80

BNDAF-003

~3

0.75

0.55

0.2

3.5/2.8

2.4/1.16

2.2/1.7

80

80

100

BNDAF-005

~5

1.1

0.55

0.2

3.8/3.0

2.4/1.16

2.2/1.7

80

80

100

BNDAF-010

~10

1.5

0.55

0.2

4.5/3.8

2.7/1.36

2.4/1.9

100

100

100

BNDAF-015

~15

2.2

0.75

0.2

5.5/4.5

2.9/1.6

2.4/1.9

100

100

100

BNDAF-020

~20

3

0.75

0.2

5.7/4.8

3.2/2.2

2.4/1.9

150

150

150

BNDAF-030

~30

3

0.75

0.2

6.5/5.5

3.2/2.2

2.5/2.0

150

150

150

BNDAF-040

~40

5.5

0.75

0.2

7.7/6.7

3.6/2.6

2.5/2.1

200

200

150

BNDAF-050

~50

5.5

0.75

0.2

8.1/7.1

3.6/2.6

2.5/2.1

200

200

150

BNDAF-060

~60

7.5

1.50

0.2

9.5/8.4

3.8/2.8

2.5/2.1

250

250

150

BNDAF-070

~70

7.5

1.50

0.2

10.0/9.0

3.8/2.8

2.5/2.1

250

250

150

BNDAF-080

~80

11

1.50

0.2

10.5/9.5

4.0/3.0

2.5/2.1

250

250

150

BNDAF-100

~100

15

2.20

0.2

11.7/10.6

4.2/3.2

2.5/2.1

300

300

150

BNDAF-120

~120

15

2.20

0.2

12.5/11.4

4.4/3.4

2.5/2.1

300

300

150

Dissolved Air Flotation Application

Contact Us

Contact: Zoe Wang

Tel: 86-510-80798006

Email: zoe.wang@benenv.com