e-SBR (Sequencing Batch Reactor) systems are simply another version of conventional activated sludge processes.
As in any other activated sludge purification process, e-SBR develops a mixed culture of bacteria capable of removing COD, BOD5 and nutrients usually present in wastewater.
Unlike conventional systems, e-SBR develops complete purification operational cycles (equalisation, aeration, denitrification and settlement) inside a single tank. Several separate tanks are arranged in sequence and, thanks to an automated system, each cycle can have a different duration and start at any time in a 24-hour period, thus optimising the treatment process time.
For this reason e-SBR systems can be used to treat a wide variety of domestic and industrial wastewater types with a flow rate ranging from only a few to a hundred cubic metres per day and also with modular solutions with several
treatment lines.
This system guarantees extremely low energy consumption and allows for oxygen supply and biomass agitation to be carried out independently, making it also possible to eliminate the denitrification tank.
PROCESS STEPS
1. Fill – The influent entering the reactor is mixed by means of aerobic and anoxic cycles with modulating aeration; this allows nitrification and denitrification. The anoxic phase allows the control of filamentous organisms and is crucial for systems requiring phosphorus removal.
2. React – The wastewater ceases to flow and the entire volume is aerated on a continuous basis; the automatic oxygen supply guarantees maximum energy saving.
3. Decant – In a quiescent condition, with no aeration, the liquid/solid separation is carried out through settling.
4. Discharge – The purified supernatant is removed in the same quiescent condition and with no aeration. After completing this phase the reactor is ready for a new treatment cycle.
