Ecobatch™, or the Sequencing Batch Reactor SBR (generic name) is a basin, or a set of basins of waste activated sludge (WAS) working discontinuously, alternating filling and emptying phases.
Overview
A settling phase is included to deliver treated water. An SBR is thus both an activated sludge basin and a final clarifier. In most applications five phases are repeated during a cycle: filling, reaction, settling, emptying and idle.
Applications
- Small or medium sized plants.
- High sludge ages (N or N/DN purpose).
- Cold wastewater.
- Applications requiring flexibility (e.g. industry).
- Concentrated waters (e.g. industry)
- Low SVI.
Features & Benefits
Ecobatch is a SBR (Sequencing Batch Reactor), which is a basin, or a set of basins of waste activated sludge operated discontinuously by alternating filling and emptying phases. A SBR combines both an activated sludge basin and a final clarifier.
Similar to a conventional biological tank
Principle (biodegradation), input (raw water), output (performance achieved) and requirement (aeration and mixing) are similar too a conventional biological tank. SBR is suitable for all biological treatment application, either municipal or industrial wastewater, to comply with any C, N and P removal requirements. However SBR is most suitable in the following cases:
Small or medium sized plants
- High sludge ages (N or N/DN purpose)
- Cold wastewater
- Flexibility demand (ex :industrials)
- Concentrated water (ex :industrials)
- Low SVI
- Easy ground excavation
Applications
Fill phase
Wastewater is pumped in under alternating nitrification/denitrification conditions (on/off aeration).
This phase can continue until the tank is full or can be time-controlled.
One or more tanks can be filled simultaneously.
Reaction phase
No pumping in. Aeration.
This phase is time-controlled and typical duration is 30 min.
The phase may be omitted if inlet flow is high.
Decantation phase
The sludge settles.
This phase is time-controlled and typical duration is 30-60 min.
Pumping out of excess sludge can start in the middle of the phase.
Outlet phase
The treated water is discharged through the decanter.
This phase is controlled by the capacity of the decanters and typical duration is 30-90 min.
Pumping out of excess sludge occurs throughout the entire phase.
Idle phase
No inlet, no outlet and no aeration.
This phase is time-controlled and typical duration is from 30 min. or longer.
The phase can be omitted if inlet flow is high.
Pumping out of excess sludge occurs during the entire phase.