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Sequencing Batch Reactors
Sequencing Batch Reactors

Sequencing batch reactors or SBRs are a type of reaction tank used in wastewater treatment, where a series of steps are allowed to proceed in one tank, hence its name.

The first stage is the fill phase, where the tank is filled with the wastewater to be treated. Next is the react phase, where the reactions like oxidation and nitrification proceed. This phase is usually accompanied by aeration. This is followed by the settling phase, where pollutants are allowed to settle, and the decant phase, where the supernatant liquid is drawn from the reaction tank to the next unit operation. The final stage is the idle phase, where the reaction tank does not hold any wastewater, but this is when waste sludge is discharged from the tank. The process goes back to the first stage and the cycle is repeated.

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MLSS is used to measure the TSS in activated sludge, while MLVSS is used to measure the concentration of biomass in activated sludge.

Return activated sludge, or RAS, is used to maintain the population of microorganisms needed for reaction to proceed in the aeration tank. In a way, this is a method of optimization in wastewater treatment.

Several factors could cause foaming in the SBR and the CCC, sometimes even in the equalization tank.
1. First, check that you are not overaerating; the maximum DO in each tank should be at 4mg/L. If it's more than that,... (More)