Grundfos Holding A/s

Dominik Marek Dominiak

Tom Bjerregaard Jæger

Jacob Appelt Vibe Svendsen

Jan Carøe Aarestrup

Christian Rasmussen

Rikke Eriksen Gissel

Xing Zheng

Victor Augusto Yangali-Quintanilla

Marcel Gausmann

Wilhelmus Johannes Cornelis Van De Ven

Rune Hoejsholt

Tom Jæger

Rune Haubjerg Hoejsholt

Jacob Svendsen

A dosing pump () doses antiscalant into a membrane-based water treatment system (). The dosing pump () includes a displacement body for pumping antiscalant into the membrane-based water treatment system () in doses. A motor drives the displacement body. A control module controls the motor. The control module is configured to vary the dosage of antiscalant pumped into the water treatment system () based on a temperature corrected system variable (SVTc) being based on a plurality of operating variables of the water treatment system ().

Method for dosing antiscalant into a membrane-based water treatment system

The present invention relates to a process and device for selectively removal of deflocculated sludge below a pre-selected size from a sludge mixed liquor. The invention resides in the concept of removing from the sludge mixed liquor deflocculated sludge. The removal is preferably carried out by a two-step separation providing a fraction comprising sludge flocs, substantially freed from deflocculated sludge, and a fraction containing mostly deflocculated sludge. The fraction comprising sludge flocs is returned into the sludge mixed liquor, while the fraction containing mostly deflocculated sludge is removed from the system.

Multi-parameter enhancement of membrane bioreactor process efficiency by biomass selection and selective biomass wasting

The present invention relates to a filtering device for a water treatment system comprising a biological treatment device adapted to provide a sludge from wastewater or filtrated wastewater, and/or the biological treatment device being fluidic connectable to or in fluidic connection with the filtering device for receiving filtrated wastewater from the filtering device and for delivering sludge to the filtering device. The filtering device is a cake filtration device comprising a fluid penetrable support structure and the support structure is provided as one or more tubular elements having a filtration cake provided on the inside of the fluid penetrable support structure. The filtering has device an inlet being connectable to receive liquid to be filtered so that the flux of liquid to be filtered is from the inside of the support structure, through the filtration cake and to the outside of the support structure thereby providing a filtrate, an outlet for outletting liquid from the interior of the tubular element, and a filtrate outlet for outletting filtrate from the filtering device. The filtration cake is being provided by deposition of solids from the sludge formed in the biological treatment device.

Tubular elements for cake filtration and method of providing a filtration cake

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

a filtering method, with which a fluid to be filtered is led through a filter (), the filter () is back-flushed at regular time intervals and a pre-treatment agent is added to the fluid at the entry side of the filter. A process variable which describes the efficiency of the filtration is continuously computed during the filtration, and a metering quantity of the pre-treatment agent is reset on the basis of the values for the process variable or a characteristic values derived from this.

Filter method for filtering a fluid and adjusting a pre-treatment agent based on a process variable

The present invention relates to a method of filtering a feed and waste water treatment system using the filtration method. The method utilizes a filtration cake for the filtration, which filtration cake is formed by elements contained in a liquid having a different composition than the feed to the filtered. The invention relates in particular to a method for filtering a liquid containing solid particles of different sizes which utilizes a filtration cake formed at least partly and preferably only from particles contained in said liquid containing solid particles of different sizes. The particles of the filtration cake are deposited on a filtration cake support and the method involves separation of the liquid containing solid particles of different sizes into two fractions: one fraction containing solid particles above a certain size and one containing smaller particles, and filtering the fraction containing smaller particles through the filtration cake. According to preferred aspects of the invention, the feed to be filtered is activated sludge supernatant and the filtration cake is formed from floes of an activated sludge mixed liquor.

Method and system for filtration and filtration cake layer formation

The present invention relates to filtration of liquids, such as water, containing substances that desirably should be removed from the liquids. The invention relates in particular to a filtration cake, being produced in situ of a cleaning system from substances that desirably should be filtered away. Particular preferred embodiments of the present invention relate to treatment of waste water, where an activated sludge is provided, which sludge contains activated sludge flocs. These flocs are accumulated on a fluid penetrable support structure to form a layer of flocs, which subsequently is compressed to form a filter of desired properties. The invention also relates to adapting waste water&#x2014;or other liquids containing biodegradable substances&#x2014;to optimized biodegradation and filtration by deflocculating flocs in an activated sludge during or before a biodegradation step and subsequently promoting re-flocculation prior to filtering or other means of biomass separation.

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Lodz, Poland

Dominik Marek Dominiak