Abstract: The invention concerns the use of filtering means comprising a housing (2) wherein are arranged parallel to one another a plurality of hollow fibers (3), whereof the porous wall (3a) of each defines an aperture (4), so that said means comprises a inner path and an outer path (B) corresponding to the volume available between the fibers and the disc separator for treating an initial sample with large volume comprising in diluted state a plurality of micro-organisms of different sizes. The invention is characterised in that during at least a concentration step, one single means of filtering is available, the atomic mass unit threshold of the porous wall (3a) of the fibers is determined so as to retain the smallest micro-organism of the initial sample, said means being used in frontal mode and discontinuously, thereby providing the output sample liquid, that is the concentrate.

Abstract: The invention concerns a method for avoiding irreversible membrane clogging while maximising productivity, whatever the quality of the fluid at the installation intake. It consists in automatically controlling the installation operating parameters by performances induced by the quality of the fluid to be treated, based on predictions concerning the evolution of the membrane clogging carried out by modelling with a neuron network so as to simulate the long term operating conditions of the membrane filtering installation, the model enabling, on the basis of the quality of the in-flowing fluid and on the state of the membranes during a given cycle, to calculate the evolution of the clogging state of said membranes on a time basis, on a specific horizon, said calculation being performed for a simulated in-flowing quality, constant or variable, on said horizon (H) and to control and adjust the installation operating parameters.

Abstract: The invention concerns the use of filtering means comprising a housing (2) wherein are arranged parallel to one another a plurality of hollow fibres (3), whereof the porous wall (3a) of each defines an aperture (4), so that said means comprises a inner path and an outer path (B) corresponding to the volume available between the fibres and the disc separator for treating an initial sample with large volume comprising in diluted state a plurality of micro-organisms of different sizes. The invention is characterised in that during at least a concentration step, one single means of filtering is available, the atomic mass unit threshold of the porous wall (3a) of the fibres is determined so as to retain the smallest micro-organism of the initial sample, said means being used in frontal mode and discontinuously, thereby providing the output sample liquid, that is the concentrate.