An system for processing biomass comprising a stator, a rotor having an axis of rotation, the rotor being disposed inside the stator and configured to rotate about the axis of rotation therein, a processing chamber defined between the rotor and the stator, an inlet in fluid communication with the processing chamber which is designed to introduce unprocessed biomass into the processing chamber, an outlet in fluid communication with the processing chamber which is designed to carry out processed biomass from the processing chamber and a pump operationally associated with the inlet and the outlet, wherein the pump is configured to pump the unprocessed biomass through the processing chamber.