6. Tests

Their purpose is to experimentally determine the filtration coefficient k _o , the permeability B _o of the clean bed, the retention function F ( $\sigma$ ) and the pressure function G ( $\sigma$ ). They can be carried out either in the industrial plant, or by means of a small-section pilot unit. In both cases, it is first necessary to determine the evolution of the retention profile $\sigma \left(z\right)$ or that of the concentration profile y (z), as well...