Chapter Seventeen

Capillary Suction Time (CST)

N.F. Gray     Water Technology Research Group, Trinity Centre for the Environment, Trinity College, University of Dublin, Dublin, Ireland


Capillary suction time (CST) is a simple and precise measure of the rate at which water is released from a sludge matrix. This measure of sludge dewaterability is used to optimize the performance and operation of sludge dewatering processes (e.g., belt and filter presses, vacuum filters, centrifuges, and drying beds), including the calculation of optimal chemical addition to aid separation (i.e., coagulants, flocculants, or conditioners). Sludges that release water quickly have a low CST and vice versa. The test is primarily used in the water and wastewater ...

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