The SBR is a fill-and-draw system. In this system, wastewater is added to the reactor, treated to remove undesirable components, and then discharged. For larger flows, two or more tanks can be used in an alternating sequence.
Sludge settles when aeration is shut down and a drainage mechanism used to draw off the supernatant liquor. The various treatment stages take place at predetermined and programmable intervals, all the stage constituting a cycle. A typical cycle comprises five sequences grouped to form three phases figure Click here to create your account in order to view the illustrations Figure Typical SBR cycle The final idle stage can be eliminated by removing the sludge at the end of the drainage period.
The durations quoted are provided for information as a percentage of the total cycle that can fluctuate between 4 and 12 hours, or even more for some IWW. These durations may vary according to the influent concentration and because the aim is the exclusive elimination of carbon or the elimination of carbon and nitrogen, or even phosphorous.
In this type of system, with one single tank, effluent feed and discharge will be intermittent. In order to achieve continuous infeed, a second tank has to be added, offset by half a cycle in the case of the example selected.
However, at least four tanks will be required in order to ensure a constant outflow. Based on this fundamental principle, a number of variants to this process have been developed, all using intermittent decant.
Previously used by small and medium capacity plants, the SBR technique now applies to major urban areas over 1 million p. We give below the advantages and drawbacks associated with this type of system.
For some time, SUEZ has been developing sequential systems, starting for fixed water levels and appropriate to small plants: Finally, having recognised the advantages of batched systems during the 90'stwo systems, including the Cyclazur were offered, leading to the following two systems at present: Each cylindrical or rectangular reactor is of the variable water level type principales phases du cycle The successive phases that take place in the same cell follow the sequence detailed below figure The liquid level rises in the cell and aeration commences.
The various biological reactions take place during this phase: It is during this period that sludge static sedimentation takes place together with endogenous denitrification within the biological floc; drainage phase 3: Sludge blanket sedimentation and endogenous denitrification continue.
Excess sludge is extracted at the end of the drainage period. This selector acts as a contact zone and, depending on its characteristics plug flow, hydraulic contact timewill: This mechanism is controlled by a measurement of the dissolved oxygen found in the Cyclor cell using programmed dissolved oxygen concentration settings.
Using the GreenBassTM regulation system is also suitable. The standard Cyclor is not fitted with an agitator.The sequencing batch reactor process (SBR) involves a single complete mix type reactor in which aeration takes place followed by clarification, whence the designation “sequential”.
Sludge settles when aeration is shut down and a drainage mechanism used to draw off the supernatant liquor. • Sequencing Batch Reactors (SBR) are a special form of activated sludge treatment in which all of the treatment process takes place in the reactor tank and. Wastewater Technology Fact Sheet Sequencing Batch Reactors DESCRIPTION The sequencing batch reactor (SBR) is a fill-and-draw activated sludge system for wastewater treatment.
In this system, wastewater is added to a .
The AquaSBR ® sequencing batch reactor provides true batch reactor technology with all phases of treatment accomplished in a single reactor.
All components are easily accessible and the advanced decant system ensures optimum quality effluent withdrawal. • Sequencing Batch Reactors (SBR) are a special form of activated sludge treatment in which all of the treatment process takes place in the reactor tank and clarifiers are not required.
This process treats the wastewater in batch mode and each batch is sequenced through a series of treatment stages. A sequencing batch reactor is a wastewater treatment plant and for this reason, small installations up to 50 total population refer to the EN specifications.