Abstract: The invention relates to a device and to a method for the hydrodynamic removal of dense materials from a suspension, said device comprising a hydrocyclone (1), which holds the suspension, a classifying tube (2), which adjoins the hydrocyclone, and a storage chamber (3), which holds the removed dense materials, wherein a flushing water flow to the classifying tube (2) and a flushing water flow to the storage chamber (3) are provided, which can be controlled in a closed-loop or open-loop manner by means of a control element provided at the feed to the classifying tube and a control element provided at the feed to the storage chamber, respectively.

Abstract: The invention relates to a device and to a method for the hydrodynamic removal of dense materials from a suspension, said device comprising a hydrocyclone (1), which holds the suspension, a classifying tube (2), which adjoins the hydrocyclone, and a storage chamber (3), which holds the removed dense materials, wherein a flushing water flow to the classifying tube (2) and a flushing water flow to the storage chamber (3) are provided, which can be controlled in a closed-loop or open-loop manner by means of a control element provided at the feed to the classifying tube and a control element provided at the feed to the storage chamber, respectively.

Abstract: A process and an apparatus for low-emission storage of biodegradable materials by means of aeration, without aerobic conditions materializing in the material, permits a more consistent feed of the downstream stages in the process. Aeration inhibits methanogenesis and the risk potential of an explosive gas mixture forming in the storage vessel or in the components of the system exhausting waste gas. Closed loop control of the aeration adapts the rate of aeration to the biological activity in the stored material and minimizes air input so as to minimize the loss of methanogenesis potential by aerobic conversion of the matter whilst minimizing the energy required for aeration. The process is characterized in that controlling the aeration in the storage vessel inhibits relevant methanogenesis.

Abstract: The invention relates to a pulper and to its method for recycling wastes and/or product residuals. The pulper comprises a tank is which a rotor is provided for defibrating the stock mixture to be recycled, as well as a screen for drawing off the defibrated outfeed from the tank, the rotor being powered by an electric motor comprising a drive shaft in active transmission with the rotor. In accordance with the invention the electric motor is configured as a three-phase synchronous motor for operation in a speed range from 0 to 1000 rpm. It is connected to the output of a frequency inverter controlled by a controller, the output of the drive shaft being directly connected to the rotor.

Abstract: The invention relates to a pulper and to its method for recycling wastes and/or product residuals. The pulper comprises a tank is which a rotor is provided for defibrating the stock mixture to be recycled, as well as a screen for drawing off the defibrated outfeed from the tank, the rotor being powered by an electric motor comprising a drive shaft in active transmission with the rotor. In accordance with the invention the electric motor is configured as a three-phase synchronous motor for operation in a speed range from 0 to 1000 rpm. It is connected to the output of a frequency inverter controlled by a controller, the output of the drive shaft being directly connected to the rotor.