The decanter is the core equipment in intermittent activated sludge processes (such as SBR, CASS, CAST processes), mainly used to accurately discharge the supernatant from the surface of the tank at the end of the sedimentation stage, while avoiding disturbance to the bottom sludge layer. Its core functions and features include:
1. Efficient Drainage and Water Quality Assurance
Slowly discharge water from top to bottom through weir or siphon design to ensure that the concentration of suspended solids in the effluent meets the standard.
Structures such as floats and slag blocking plates can isolate floating debris, further improving water quality.
2. Support intermittent process operation
Replace traditional secondary sedimentation tanks and sludge return systems, saving land and investment.
When multiple pools are connected in series, flexible switching between continuous water intake and intermittent drainage can be achieved.
3. Energy saving and automation control
Adopting PLC intelligent drive or buoyancy balance design, it has low energy consumption and can automatically follow water level changes.
Rotating, floating and other types can reduce manual intervention.
Diversified application scenarios
In addition to sewage treatment, it is also used for liquid filtration in industries such as chemical, food processing, and pharmaceuticals.
There are also applications in laboratory sample separation, drinking water purification, and other fields.
The typical types of decanters include rotary, siphon, float, etc. The selection should be determined based on process requirements such as drainage depth, velocity, and other parameters. Its material is usually stainless steel, which has the characteristics of strong corrosion resistance and long service life.