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In contrast to secondary clarifiers in conventional treatment plants, the treated wastewater in SB-reactors cannot be discharged using an overflow channel due to process-specific reasons. As volume needs to be provided in the SB-reactor for new raw wastewater of the subsequent cycle, an extraction device for clear water is required, which follows the falling water level.
The decisive factor is here a discharge process which neither floating sludge nor activated sludge is captured. The decanting device also must offer a fail-safe operation, as it is one of the most important process components of a SBR wastewater treatment plant.
Our aim developing a clear water discharge device was mainly to create a system, which does not suffer from the known disadvantages of many existing systems. More than 400 installed BSK®-decanters around the world prove the successful product implementation. Following features have convinced and convince both planners and users:
Remarkable high discharge volume - already with small diameters
Two different discharge modes allow the end-user to adapt the water flow according to the specific project conditions
Used material AISI 304 or AISI 316 only (depending on the field of application)
Well-proven technology protected by an additional weather hood
Simple and prefabricated parts allow a quick setup
Effective barrier by baffle plate
Maintenance free and lifetime lubricated swivel joints
Clear water discharge by use of gravity
Wastewater treatment
Biogas plants
Water treatment
Municipal wastewater treatment plants/private companies:
Mobile wastewater treatment systems:
Industrial wastewater treatment systems for the food industry:
Animal breeding and slaughterhouses:
Industrial wastewater treatment plants for the non-food sector:
1 Local switch box or control box
2 Electrical winch
3 Lifting rope, stainless steel
4 Air vent valve
5 Air vent pipe
6 Conductive sensor (option)
7 Inlet pipe
8 Sludge baffle / barrier for floatings
9 Connection pipe
10 Swivel joint / rotating link
11 Concrete wall
12 Catching rope, stainless steel
13 Discharge of cleared wastewater
A Maximum water level
B Minimum water level’
C Sludge level
The standard BSK®-Decanter is used in 7 different sizes (pipe diameters). For normative applications (WLmax = 5.0 m, WLmin = 3.0 m, head loss = 1.0 m) the following capacities of each size apply:
| Product Type | Qab [m3/h] |
|---|---|
| BSK®-DCW 100 | 130 |
| BSK®-DCW 150 | 320 |
| BSK®-DCW 200 | 570 |
| BSK®-DCW 250 | 790 |
| BSK®-DCW 300 | 1.180 |
| BSK®-DCW 350 | 1.650 |
| BSK®-DCW 400 | 2.160 |
Fabrication in different stainless steel grades possible:
Further additional options are available.
Normally, the BSK®-DCW model is used in SB-Reactors as fully automatic discharge system.
The BSK®-DSW model is typically used is basins for sludge thickening, in which the supernatant water is mainly discharged manually.
Accordingly, every BSK®-Decanter is especially adapted to its individual application.
Our operationally safe BSK®-Decanters are used worldwide, e. g.:
Biogest International® GmbH
Abwassertechnische Systeme
Berthold-Haupt-Str. 37
01257 Dresden, Germany
