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US 12,673,883 B2Granted
Method of dosing biocide into a fluid system
AssigneeGrundfos Holding A/S
InventorsSébastien D'Antonio, Victor Augusto Yangali Quintanilla, Joachim Bach Kaas, Kristian Lydersen Rindom
Life of this patent
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Abstract
A method and apparatus are provided for dosing biocide into fluid. A biofilm sensor configured to measure an amount of biofilm on the biofilm sensor is used. A method identifies, if present, in a data set representing measurement over time by the biofilm sensor a minimum and an inflection point and, if identified. According to some embodiments, dosing of biocide is determined to be effectuated when an inflection point has been identified occurring time wise after an identified minimum.
Claims20
A method of dosing biocide into a fluid system, the method comprising:
- providing a control unit, a biofilm sensor arranged in the fluid system and a dosing pump arranged in the fluid system to dose biocide into the fluid system, the biofilm sensor having a sensing surface configured to be exposed to a flow of fluid in the fluid system, the sensor being configured to measure an amount of biofilm on said sensing surface of the biofilm sensor, said control unit being configured to obtain and store data representing measurements of the amount of biofilm on said biofilm sensor from said biofilm sensor, said dosing pump being controlled by said control unit to dose biocide into the fluid system;
- controlling said pump by the control unit to provide a dose of biocide into the fluid system;
- after said initial dose of biocide, obtaining and storing data from said biofilm sensor via said control unit, said data representing measurements of a first amount of biofilm on said biofilm sensor measured by said biofilm sensor after said initial dose of biocide;
- determining a minimum in said data via said control unit, wherein said minimum represents a maximum obtainable biofilm removal from said sensor based on said initial dose of biocide;
- determining an inflection point in said data via said control unit, the inflection point occurring after said minimum in said data, and recording the inflection point via said control unit, wherein said inflection point represents a point in time at which measurements of a second amount of biofilm begin to go towards a plateau, wherein said plateau represents that said biofilm sensor is no longer capable measuring biofilm growth on said sensing surface;
- determining the point in time based on said data via said control unit to provide a subsequent dosing of biocide into the fluid system via said control unit after said inflection point and said minimum are determined, wherein said point in time is determined to occur after said inflection point and before said plateau in said data is reached;
- and
- controlling said pump by the control unit to provide said subsequent dosing into the fluid system via said dosing pump at said point in time.
5 more elements
A method of dosing biocide into a fluid system, the method comprising:
- providing a control unit, a biofilm sensor arranged in the fluid system and a dosing pump arranged in the fluid system to dose biocide into the fluid system, the biofilm sensor having a sensing surface configured to be exposed to a flow of fluid in the fluid system, the sensor being configured to measure an amount of biofilm on said sensing surface of the biofilm sensor, said dosing pump being controlled by said control unit to dose biocide into the fluid system;
- controlling said pump by the control unit to provide an initial dose of biocide into the fluid system;
- after providing said initial dose of biocide, measuring the amount of biofilm on said biofilm sensor via said biofilm sensor to provide biofilm data;
- transmitting said biofilm data to said control unit, said control unit storing said biofilm data;
- determining a minimum in said biofilm data via said control unit, wherein said minimum represents a maximum obtainable biofilm removal from said sensor based on said initial dose of biocide;
- determining an inflection point in said biofilm data via said control unit, the inflection point occurring after said minimum in said data, and recording the inflection point via said control unit, wherein said inflection point represents a point in time at which said measurements of a second amount of biofilm begin to go towards a plateau, wherein the plateau represents that the biofilm sensor is no longer capable of measuring biofilm growth on the sensing surface;
- determining the point in time based on said data via said control unit to provide a subsequent dosing of biocide into the fluid system via said control unit after said inflection point and said minimum are determined, wherein said point in time is determined to occur after said inflection point and before said point in time is reached at which said biofilm sensor is no longer capable of measuring biofilm growth on said sensor surface;
- controlling said pump by the control unit to provide said subsequent dosing into the fluid system via said dosing pump at said point in time.
5 more elements
Dependencies are inferred from the claim text.