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Biological processes − the basics

Aerobic wastewater treatment with classical activated sludge Source: Judd Water & Wastewater Consultants / YouTube

The conventional activated sludge process

The CAS process comprises a biological tank, in which aerobic treatment takes place to bio-degrade the organic carbon and amino compounds, followed by a sedimentation tank (secondary clarifier). A membrane bioreactor is an adaptation of the conventional or classical activated sludge (CAS) process.

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