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The overall function of the thickener is to increase the density of a slurry stream. This is achieved by feeding the slurry stream into the thickener and by allowing the solids to settle.
The supernatant overflows for further processing or disposal.
In the case of a clarifier, the main function is to provide a clear overflow. The settled solids are raked to the centre cone of the thickener/clarifier and are removed as thickened slurry suitable for further processing or disposal as the case maybe.
Due to the low solids, the discharge of a clarifier is generally intermittent.