Biogest Surface Aerator

Equipment name: Surface Aerator

Brand: Biogest

Region: Germany

Equipment Type: Aerator

Model: 

Application: Wastewater Treatment

Description

The aeration system is responsible for supplying the required oxygen (from 5 to 85 kg per hour per aerator) and effective mixing. At low speeds, the aerator acts as a mixer, and as a result, the amount of oxygen entering the tank at the surface is minimal. And at high speed, the function of this system is to supply oxygen.

Biogest’s surface Aerators with the commercial name of CROWN was developed in cooperation with Technische Hochschule Darmstadt university for circulation and oxygen provision to the wastewater-activated sludge.

The CROWN surface aerator has been successfully installed in more than 150 plants due to its main characteristics as follows.
1) Intensive mixing in aeration tanks: according to the specific design that creates horizontal and vertical currents a complete mixing will be achieved.

CROWN OB 2500

CROWN OB 2000

CROWN OB 1600

CROWN OB 1200

CROWN OB 900

CROWN OB 750

VA 1.4301

Material

85

52

31

18

8

5

Maximum Oxygen input (KgO2/h)

45

37

22

11

5.5

3

Motor power(KW)

2500

2000

1600

1200

900

750

Diameter of aerator (mm)

998

832

720

600

400

333

Height of aerator (mm)

24

20

16

14

10

8

Number of blades

500

400

200

120

45

38

Aerator weight (Kg)

19

19

15

11.5

9

8

Max. tank length

6

5

4.5

4

3.5

2.5

Water level

1

1

1

1

0.8

0.8

Freeboard (m)

2250

1850

1100

550

275

150

Max. tank volume (m3)

Combination of mixing (denitrification) and oxygen provision (nitrification) according to the operation of aerator in different speed, low speed for mixing and high speed to provide oxygen demand.

4) Completely steel construction
5) long lifetime without reduction of its efficiency due to the robust construction
6) low energy consumption
7) low maintenance, all required maintenance parts are located above water level so any required repair would be easy

Application in fixed and variable water levels is based on the following.

1- Fixed water level:
1-1- Lateral installation (installation near the wall), to ensure the needed mixing of tank’s content it is necessary to be complemented by a mixer.

              

 

1-2- Central installation, the aerator has to be installed on a bridge

             

 

2- Variable water level
2-1- Lateral installation (installation near the wall), to ensure the needed mixing of tank’s content it is necessary to be complemented by a mixer.

              

 

2-2- Central installation, the aerator has to be installed on a bridge

             

 

Important features of surface aeration:

  • Oxygen input efficiency up to 2.8 kg / kWh
  • Input capacity up to 308 kg per hour
  • Made entirely of stainless steel
  • Almost unlimited life while maintaining aeration efficiency due to its strong structure
  • Concentrated mixing
  • Low energy consumption
  • Commissioning at different speeds and application in two modes of fixed and variable sewage level

 

Customized design:
Under consideration of project-related requirements, the standard scope of delivery of the CROWN surface aerator can be enlarged by several optional components. The main optional components are as follows:
1- Complementing by a crusher unit, the advantage is rejected of particulates which incoming with sewage which makes the requirement of pretreatment no more necessary.