The invention is directed to a homogenization device for cell suspensions, comprising a first rotating magnet; a shaft on which a propeller mixer is attached which rotates around the longitudinal axis of the shaft and is movable in lateral direction of the axis of the shaft; the propeller mixer being provided with at least two propeller blades of which at least one is provided with a second magnet; wherein the propeller mixer is rotated by magnetic interaction of the second magnet with the first rotating magnet.

A bioreactor (30) for production and harvesting of microalgae is described, comprising a reactor basin (32) in the form of a tank arranged to receive CO2 and water as well as algae, and which is equipped with at least one outlet for harvesting of algal biomass, where the reactor basin (32) comprises a rotating beam (54) equipped with one or more tillable mixing grates (60) and harvesting grates (62).

A vertically moving horizontal mixer assembly which includes a tank having an axis. A stator and blade support assembly is movable parallel to the tank axis. At least one rotatable blade substantially perpendicular to the tank axis is moveable parallel to the tank axis. The rotating blade may be a flat circular disk with raised tooth edges perpendicular to the disk around the circumference of the blade. An optional stator also directs and encourages movement and mixing of solids with liquids.

A stirring device for stirring a biphasic fluid has a stirring shaft that can be mounted with a mounting end into a stirring drive. The stirring device also has a first paddle that is arranged in a rotationally fixed manner at or near a stirring end of the stirring shaft that is opposite to the mounting end, and further has a second paddle that is arranged in a rotationally fixed manner at the stirring shaft in between the mounting end and the first paddle. The second paddle is mounted with respect to the stirring shaft in such a manner that it can be displaced in an axial direction along the stirring shaft, which allows for a change of an axial distance between the second paddle and the mounting end of the stirring shaft.

A pneumatic bioreactor includes a vessel containing a fluid to be mixed and at least one mixing device driven by gas pressure. A first embodiment includes a floating impeller that rises and falls in the fluid as gas bubbles carry it upward to the surface where the gas is then vented, permitting the impeller to sink in the fluid. The floating impeller may be tethered to a second impeller with a flexible member and pulley. The mixing speed is controlled with electromagnets in the vessel acting upon magnetic material in the impeller or its guides. In another embodiment, floating pistons mix the fluid, pushing it through a mixing plate with one or more apertures. In a third embodiment, the mixing device is a rotating drum with bubble-catching blades and rotating mixing plates with apertures. The top of the vessel for these mixers may include a closed top and sterile filters.

Embodiments of the present disclosure relate to a food waste disposer, and more specifically, to a food waste disposer which prevents the formation of a blind spot where food accumulates through the shape of a chamber in which food and microorganisms are accommodated, and improves the efficiency of food decomposition and processing by effectively stirring the food and microorganisms using blades and stirring rods.