Grundfos Management A/s

Grundfos Holding A/s

Grundfos A/s

Christian Rasmussen

Finn Beldring

Helge Grann

Jacob Appelt Vibe Svendsen

Dominik Marek Dominiak

Kjeld Appel

Jan Harding Gliemann

Rune Hoejsholt

Eigil D Andersen

Rune Haubjerg Hoejsholt

Jacob Svendsen

A control method is provided for a filter system, which includes at least one filter element (). The method includes continuously recording a total energy consumption (E) during a filtration cycle () of the filter system. The total energy consumption (E) includes at least of the energy consumption (E) for a physical cleaning () and the energy consumption (E) for the subsequent production cycle () up to a predefined, in particular current point in time. The method further includes computing a relative energy consumption (E) by way of division of the recorded total energy consumption (E) by a net permeate volume (Q) which has been produced during the filtration cycle () up to the predefined point in time and starting a physical cleaning () in dependence on the relative energy consumption or of a characteristic value derived from this.

Control method for a filter system

The invention relates to a forward osmosis (FO) device () with a semipermeable membrane () capable of performing forward osmosis between a first (F) and a second fluid (F). In a first fluid confinement (), a first swirl generator () is positioned and in a second fluid confinement () positioned on the other second side of the membrane, a second swirl generator () is positioned. The swirl generators are arranged to create a circular flow pattern (S, S) for the first and the second fluid, respectively, wherein the first () and second () swirl generator, upon engagement, are arranged to create a circular flow pattern for the first and the second fluid, respectively, by rotating motion (RA, RA). The invention is advantageous by obtaining FO device that is capable of reducing the concentration polarization (CP) near the membrane by creating a cross flow velocity over the membrane and facilitate control of the cross flow velocity independent of the through flow of the membrane. The external concentration polarization can thereby be controlled and further reduced.

Forward osmosis device

A pump unit is provided having a wet-running electric motor, wherein a rotor of the pump unit can be driven by the electric motor at a maximum speed of greater than 20,000 rev/min, and the rotor is sealed off axially in the region of a suction port.

Pump assembly

A reactor includes a tubular-shaped housing in which a stack of filter plates can be rotationally arranged. The cross-sectional area of the reactor container is, in the region of the stack of filter plates, a maximum of 40% greater than the cross-sectional area of the stack of filter plates. The longitudinal extension of the reactor housing is a multiple of the longitudinal extension of the stack of filter plates, such that inside the reactor, adjacent to the stack of filter plates, additional processing devices can be arranged. The rotating stack of filter plates ensures that the entire reactor is cross-flown in an intensive manner.

Reactor comprising a stack of filter plates

The filter device is provided with a housing () and with a stack of filter plates () arranged therein at a spacing from one another. The housing includes an inlet () for the fluid to be filtered, an outlet () for the filtrate which is connected in a conducting manner to the inside of the filter plates (), and a cavity extending through the stack and formed by recesses in the filter plates (). The filter plate stack is arranged fixed to the housing, and a centrifugal pump () with several impellers () is arranged within the filter plate stack. This pump ensures an intensive through-flow of the filter plate stack and thus a removal of the filter residues.

Filter device

A submersible pump unit having a wet-running electric motor and only a single impeller can be driven by the electric motor with a rotation speed greater than 20,000 rpm. The rotor of the electric motor has a diameter of less than 25 mm.

Submersible pump unit

A filter device includes a housing () having at least two rotation bodies (,) which are arranged therein and are driven by a shaft (). The rotation bodies () are designed and arranged for producing a centrifugal pumping effect. A guidance device () is provided between the rotation bodies (), which connects the pressure side () of a first rotation body () to the suction side () of a rotation body () arranged therebehind in the flow direction (). The intermediate spaces between the rotation bodies are provided with a filter arrangement.

A device is provided for fluid treatment, in particular for waste water treatment. The fluid is led along a surface () coated with biological material. A wiper element () is provided, which brushes the surface () not as a whole, but in paths. The path course is selected such that the coated surface () is successively brushed in sections.

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Tjele, Denmark

Christian Rasmussen