Process and device for separating biological particles contained in a fluid by means of filtration

A process for separating biological particles and the fluid that contains them comprising

• subjecting a fluid containing biological particles to at least one vertical filtration stage through a filter having a porosity suited to the nature of the biological particles to be separated so that said biological particles are retained by the filter, and the fluid passes through the filter
• wherein
• the filter comprises at least one elementary filtration area, each elementary filtration area having a limited surface,
• each elementary filtration area and the number of elementary filtration areas are set according to the nature of the fluid to be filtered, the nature of the biological particles to be separated and the volume of fluid to be filtered,
• each elementary filtration area has a surface equal to that of a disk with a diameter of between 0.6 cm and 3 cm, and
• the number of elementary filtration areas is set so that the ratio of the volume of fluid filtered and of the filtration surface is less than 40 ml/cm2.