Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.V.

André Weidauer

Jörg Kubusch

Volker Kirchhoff

Frank-Holm Rögner

Gösta Mattausch

Christiane Wetzel

Jessy Schönfelder

Gaby Gotzmann

Ralf Blüthner

Rainer Labitzke

Burkhard Zimmermann

Ignacio Gabriel Vicente Gabas

Ralf BLÜTHNER

Gösta Dr Mattausch

A method may be provided for inactivating biologically active components in a liquid using low-energy electrons generated by an electron source, the electrons having an acceleration voltage of 25 keV to 300 keV. The method comprises the following steps: a) filling a vessel with a liquid volume; b) applying low-energy electrons to a first partial volume of the liquid filled into the vessel, wherein the first partial volume is a maximum of 10% of the liquid volume in the vessel; c) mixing the first partial volume of the liquid, applied with the low-energy electrons, to the second partial liquid volume in the vessel, which has not been applied with low-energy electrons; d) repeating steps b) and c) several times.

Method for inactivating biologically active components in a liquid

A method may be provided for stimulating the growth of a biomass, which is mixed with a liquid inside a bioreactor, by means of ionising radiation. The following method steps are used: a) exposing a first partial volume of the liquid in the bioreactor to ionising radiation, the first partial volume comprising at most 10% of the liquid volume in the bioreactor; b) mixing the first partial liquid volume, which has been exposed to ionising radiation, with the second partial liquid volume, which has not been exposed to ionising radiation, in the bioreactor; c) repeating method steps a) and b) multiple times, each partial volume of the liquid in the bioreactor being exposed to a total radiation dose of at most 50 Gy on statistical average.

Method for stimulating the growth of a biomass, contained in a liquid, inside a bioreactor

Apparatuses and methods are provided for applying accelerated electrons to a gaseous medium by means of an electron beam generator, which has at least one cathode for emitting electrons and at least one electron exit window, wherein a) the at least one cathode is annular and the at least one electron exit window is in the form of an annular first hollow cylinder, the annular electron exit window in the form of the first hollow cylinder forms an inner wall of an annular housing of the electron beam generator, wherein the electrons emitted by the cathode are accelerated to the ring axis of the annular housing; b) an annular second hollow cylinder is arranged within the electron exit window in the form of the first hollow cylinder and delimits an annular space between the first hollow cylinder and the second hollow cylinder; c) a cooling gas is fed through the annular space between the first hollow cylinder and the second hollow cylinder; and d) the gaseous medium to which accelerated electrons are to be applied is fed through the second hollow cylinder.

Apparatus and method for applying accelerated electrons to gaseous media

An apparatus is provided for generating accelerated electrons, including a housing; an inlet for supplying a working gas; at least one first cathode; and at least one first anode, between which a corona discharge plasma can be generated. Ions from the corona discharge plasma can be accelerated onto the surface of a second cathode. Electrons emitted by the second cathode can be accelerated in the direction of the electron exit window by means of a second electric voltage applied between the second cathode and a second anode. The housing, the second cathode, and the electron exit window are ring-shaped. The ring-shaped space is divided into ring segments. Each ring segment has at least one wire-shaped electrode, which extends through the ring segment. At least one separate power supply device is associated with each ring segment, by means of which the strength of the electrical current is adjustable.

Apparatus for generating accelerated electrons

An apparatus includes at least one electron beam generator for generating accelerated electrons with which bulk material particles are impingeable during free fall. The electron beam generator has an annular design in which the electrons are emitted and accelerated by an annular cathode. The electrons exit from an electron outlet window in the direction of the ring axis. The annular electron beam generator is arranged in such a way that the ring axis of the electron beam generator is oriented perpendicular to, or at an angle of up to 45&#xb0; from the horizontal. The apparatus may further include a device for separating bulk material particles arranged above the annular electron beam generator, the bottom wall of said device having at least one opening out of which the bulk material particles fall and, from there, fall through the ring which is formed by the electron beam generator.

Apparatus for impinging bulk material with accelerated electrons

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Dresden, Germany

André Weidauer