The pump extracts from a receptacle tank the suction-pressurized liquid to be separated and pumps this into the vessel-type Bioselect. Within this unit, the low-viscosity phase is separated from the solid matter, supported mechanically by the separating unit. By means of suction pressure generated by pump, the separated low-viscosity liquid travels through collecting space via the pressure connection line, to the transfer point and into the outgoing pipe for further utilization. The separating and clearing unit carries the solid-phase in the direction of the viscous-matter pump. The pressure build-up of pump, in coordination with the pumping characteristics of pump, provides the required separating result. Using frequency-control, TS content levels between 10% and 25% dry matter can be achieved. The bioselect solid/liquid separation enables a thickening of the supply quantity, as desired, only to tank-truck-suitable reduction up to high TS-content stackable thick material phases. Analogous to the measurement units A to D, actual states are displayed manometrically. These values are managed and monitored in the switching system. According to the degree of thickening, the thick phase can be conveyed with pump to another point, e.g. to a transport vehicle. Convincing arguments: - Enclosed separation system - No additives - One flow results in two diverted flows - Low-energy separation - Separating - Transporting - Controlling - No liquid discharge - Odor-neutral operation