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SBR/MBBR is a high-performance solution for wastewater treatment that can successfully handle batch operations. Hence it is perfect to use where the waste water generated per day is very low. The technology also helps in saving the running cost and low sludge generation. No need of separate clarifier or settling tank.

BASIC TREATMENT PROCESS

The operation of an SBR is based on a fill-and-draw principle, which consists of five steps —fill, react, settle, decant, and idle. These steps can be altered for different operational applications.

FILL

During the fill phase, the basin receives influent wastewater. The influent brings food to the microbes in the activated sludge, creating an environment for biochemical reactions to take place.

REACT

This phase allows for further reduction or “polishing” of wastewater parameters. During this phase, no wastewater enters the basin and the mechanical mixing and aeration units are on. Because there are no additional volume and organic loadings, the rate of organic removal increases dramatically. Most of the carbonaceous BOD removal occurs in the react phase.

SETTLE

During this phase, activated sludge is allowed to settle under quiescent conditions no flow enters the basin and no aeration and mixing takes place. The activated sludge tends to settle as a flocculent mass, forming a distinctive interface with the clear supernatant. The sludge mass is called the sludge blanket. This phase is a critical part of the cycle, because if the solids do not settle rapidly, some sludge can be drawn off during the subsequent decant phase and thereby degrade effluent quality.

DECANT

During this phase, by using electrical actuator to remove the clear supernatant sewage. Once the settle phase is complete, a signal is sent to the valve the opening of a sewage-discharge valve.

IDLE

This step occurs between the decant and the fill phases. The time varies, based on the influent flow rate and the operating strategy. During this phase, a small amount of activated sludge at the bottom of the SBR basin is pumped out a process called wasting. The treated water is discharged for gardening after disinfecting with hypo. Excess sludge from the aeration tank is dewatered and dried sludge will be disposed periodically.

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