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#### 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.



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 [Overview](#1) [Applications](#2) 

 

 

## 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.