Which version of the activated sludge process is a recent variation that uses batch treatment?

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Multiple Choice

Which version of the activated sludge process is a recent variation that uses batch treatment?

Explanation:
Sequencing Batch Reactor is a version of the activated sludge process that operates in batch cycles. In an SBR, the treatment happens in one reactor through a sequence of stages: fill, react (aerate and mix), settle, decant, and idle. This batch operation allows handling variable influent and loading, improves settling performance, and often reduces the required footprint, making it a newer variation that uses batch treatment. The other options—extended aeration, oxidation ditch, and complete mix—are typically continuous-flow configurations with ongoing aeration and mixing rather than discrete batch cycles.

Sequencing Batch Reactor is a version of the activated sludge process that operates in batch cycles. In an SBR, the treatment happens in one reactor through a sequence of stages: fill, react (aerate and mix), settle, decant, and idle. This batch operation allows handling variable influent and loading, improves settling performance, and often reduces the required footprint, making it a newer variation that uses batch treatment. The other options—extended aeration, oxidation ditch, and complete mix—are typically continuous-flow configurations with ongoing aeration and mixing rather than discrete batch cycles.

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