EP2697409A2 - Système et procédé pour nettoyage industriel - Google Patents

Système et procédé pour nettoyage industriel

Info

Publication number
EP2697409A2
EP2697409A2 EP12771682.7A EP12771682A EP2697409A2 EP 2697409 A2 EP2697409 A2 EP 2697409A2 EP 12771682 A EP12771682 A EP 12771682A EP 2697409 A2 EP2697409 A2 EP 2697409A2
Authority
EP
European Patent Office
Prior art keywords
concentration
ppm
chlorine
anolyte
available chlorine
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP12771682.7A
Other languages
German (de)
English (en)
Other versions
EP2697409A4 (fr
Inventor
Kenneth J. Roach
Henry VON REGE
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Diversey Inc
Original Assignee
Diversey Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Diversey Inc filed Critical Diversey Inc
Publication of EP2697409A2 publication Critical patent/EP2697409A2/fr
Publication of EP2697409A4 publication Critical patent/EP2697409A4/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B15/00—Operating or servicing cells
    • C25B15/08—Supplying or removing reactants or electrolytes; Regeneration of electrolytes
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/008—Control or steering systems not provided for elsewhere in subclass C02F
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
    • C02F1/467—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction
    • C02F1/4672—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction by electrooxydation
    • C02F1/4674—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction by electrooxydation with halogen or compound of halogens, e.g. chlorine, bromine
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2201/00—Apparatus for treatment of water, waste water or sewage
    • C02F2201/46—Apparatus for electrochemical processes
    • C02F2201/461—Electrolysis apparatus
    • C02F2201/46105—Details relating to the electrolytic devices
    • C02F2201/46115—Electrolytic cell with membranes or diaphragms
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2201/00—Apparatus for treatment of water, waste water or sewage
    • C02F2201/46—Apparatus for electrochemical processes
    • C02F2201/461—Electrolysis apparatus
    • C02F2201/46105—Details relating to the electrolytic devices
    • C02F2201/4612—Controlling or monitoring
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/001—Upstream control, i.e. monitoring for predictive control
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/005—Processes using a programmable logic controller [PLC]
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/06—Controlling or monitoring parameters in water treatment pH
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/29—Chlorine compounds
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/0318—Processes
    • Y10T137/0324—With control of flow by a condition or characteristic of a fluid
    • Y10T137/0329—Mixing of plural fluids of diverse characteristics or conditions

Definitions

  • Electrolyzed water can be produced by passing a brine solution through an electrolytic cell.
  • an anode and a cathode apply a low direct-current voltage.
  • two types of water are produced: at the anode, an anolyte that includes hypochlorous acid, and at the cathode, a catholyte that includes hydroxide.
  • the anolyte can be used as a cleanser, detergent, provide microbial control, and/or disinfectant, and the catholyte can similarly be used as a cleanser or detergent.
  • an industrial cleaning system comprising: an electrochemical activation unit that is capable of generating an anolyte from a brine solution, the anolyte having a concentration of available chorine; an anolyte dosing pump that is connected to the electrochemical activation unit; a chlorine probe capable of measuring the concentration of available chlorine in a diluted anolyte; and a controller unit operatively coupled to the chlorine probe and the anolyte dosing pump, wherein the controller unit activates the anolyte dosing pump when the measured concentration of available chlorine is lower than a predetermined concentration of available chlorine.
  • the disclosure relates to a method for maintaining the concentration of available chlorine in an industrial cleaning system, wherein the method comprises providing an electrochemically activated solution comprising an amount of available chlorine; measuring the concentration of available chlorine in the solution using a chlorine probe, wherein the chlorine probe has a linear or substantially linear response to the concentration of available chlorine up to at least 50 ppm and a flat or substantially flat response over a given pH range; and providing an additional amount of available chlorine to the system when the measured concentration is lower than a predetermined concentration of available chlorine.
  • the disclosure relates to a method for cleaning a system, the method comprising: providing an electrochemically activated solution having a concentration of available chlorine; determining a concentration of available chlorine that is suitable for cleaning at a given pH of the electrochemically activated solution; measuring the concentration of available chlorine in the electrochemically activated solution; activating a dosing pump when the measured concentration of available chlorine is lower than the determined concentration of available chlorine; and contacting the system with the electrochemically activated solution.
  • Figure 1 is a schematic representation of a non-limiting embodiment of an industrial cleaning system falling within the scope of the disclosure.
  • Figure 2 is a schematic representation of a non-limiting electrochemical activation unit suitable for use with the industrial cleaning system as described herein including, for example, FIG. 1.
  • Figure 3 is a generalized qualitative graph plotting the various chlorine species in an electrolyzed water solution as a function of the pH of the electrolyzed water solution generated in the electrochemical activation unit as described herein including, for example, of FIGs. 1 and 2.
  • Figure 4 illustrates the testing and evaluation of a chlorine probe.
  • Figure 4A plots the ratio of available chlorine concentration (chlorine probe/titration) as a function of pH and illustrates a response that is linear or substantially linear to chlorine concentration, and has a flat or substantially flat chlorine probe response over a pH range (see Examples).
  • Figure 4B illustrates, for purposes of contrast, a chlorine probe response that is not flat or substantially flat (the line has a non-zero slope) as a function of pH (plotted ratio of chlorine probe:titration).
  • Figure 4C plots the chlorine concentration as measured by a probe against the concentration as measured by titration demonstrating a linear or substantially linear response to chlorine concentration.
  • any numerical value recited herein includes any and all values from the lower value to the upper value, i.e., all possible combinations of numerical values between the lowest value and the highest value enumerated are to be considered to be expressly stated in this application.
  • a range is stated as 1% to 50%, it is intended that values such as 2% to 40%, 10% to 30%, or 1% to 3%, etc., are expressly enumerated in this specification.
  • particular numbers may be recited as examples falling within a disclosed range, however these are only examples of what is specifically intended.
  • ECA electrochemically activated
  • CIP ECA clean in place
  • a typical use solution can include an available chlorine concentration of about 40 ppm, which is usually adequate to provide an appropriate or acceptable kill (i.e., microbial control) against microorganisms (e.g., typically pathogenic and/or spoilage microorganisms).
  • an appropriate or acceptable kill i.e., microbial control
  • microorganisms e.g., typically pathogenic and/or spoilage microorganisms.
  • kill i.e., microbial control
  • microorganisms e.g., typically pathogenic and/or spoilage microorganisms.
  • Prior to the methods and systems provided herein, prior art systems and methods could not provide for the accurate and convenient measurement of chlorine concentrations in a range above 1-2 ppm (e.g., in swimming pools) and below several hundred ppm (e.g., hard surface disinfectants).
  • the source of the dilution water that is added to an anolyte concentrate is often from a local source (e.g., tap) and as such its composition can vary widely between various localities (e.g., water from a particular municipality may have increased buffering capacity relative to water from another municipality because of differing local water treatment(s)).
  • the final pH in the chlorine use solution determines the ratio of hypochlorite to hypochlorous acid.
  • both the methods and apparatus disclosed herein provide are that they allow for establishing a linearity between an amperometric signal and the read out of available chlorine within a given pH window (slight acid to slight alkaline) and at available chlorine (or "FAC") levels which are typical for CIP applications (e.g. a target FAC of 40 ppm for a sanitizing step in CIP).
  • FAC available chlorine
  • the disclosure provides this advantage without the need for an additional buffer component addition to the cell such as are currently found in the art, or without the need for additional components (e.g., acidification units).
  • the methods and systems disclosed herein allow for the use of any type or source of potable water to be used in connection with the system. That is, once the methods and systems disclosed herein are calibrated, a change in the potable water supply will not result in a change in the reading of available chlorine concentration (i.e., potable water source independent). It will be appreciated that periodic probe calibration should be incorporated according to the probe manufacturer's recommendations (e.g., biweekly, monthly, etc.).
  • the system and method disclosed herein can be adapted for use in any number of industrial manufacturing, processing, and conveyance systems and associated cleaning systems.
  • the method and system disclosed herein can be adapted for and/or applied to equipment generally cleaned using clean-in-place (“CIP") cleaning procedures, and find general use in any industrial setting/application where soils need to be removed (e.g., food and beverage, oil processing, industrial agriculture, and ethanol processing).
  • CIP processing is generally well- known and can include contacting (applying) one or more cleaning solution that includes one or more diluted cleaning agents with the surface to be cleaned. The solution flows on the surface at a particular rate (e.g., 0.5 to 6 feet/second) or for a particular contact time (e.g., 1, 2, 3, 4, 5, 10, 15, 30, 60, etc. minutes), and removes the soil.
  • a particular rate e.g., 0.5 to 6 feet/second
  • a particular contact time e.g., 1, 2, 3, 4, 5, 10, 15, 30, 60, etc. minutes
  • the process can include one or more steps that apply new cleaning solution to the surface, or the process and system can be set up to recirculate and reapply the same solution to the surface.
  • Common CIP processes can include any number of steps depending on the type of soil to be removed and/or the type of system to be cleaned (e.g., pretreatments, fresh water rinses, alkaline solution washes, acid solution washes, oxidizing solution washes, prolonged washing protocols for heavy cleaning, quick washing protocols for light cleaning, etc.).
  • by weight refers to the total weight of the composition. For example, if a composition has a total weight of 100 grams and comprises 40% (by weight) of a component, the composition comprises 40 grams of that component.
  • the term "about” refers to variability in the recited numerical quantity that can occur because of, for example, typical measuring and liquid handling procedures used for making concentrates or use solutions, through inadvertent error and propagation of error in these procedures; through differences in the manufacturing method, source, or purity of the ingredients used to make the compositions or components used to carry out the methods; and the like.
  • the term “about” also encompasses amounts that differ due to different equilibrium conditions for a composition resulting from a particular initial mixture.
  • chlorine species that are present in an aqueous solution in an oxidized form such as hypochlorous acid (HOC1) or hypochlorite anion (OCl ⁇ , or commonly, bleach), are interchangeably called “free chlorine,” “available chlorine,” or “free available chlorine.”
  • hypochlorous acid HOC1
  • OCl ⁇ hypochlorite anion
  • available chlorine available chlorine
  • free available chlorine available chlorine
  • An "electrochemical activation unit” or “ECA unit” as used herein includes a system that is capable of generating an anolyte from a brine solution and typically comprises an anode and a cathode. ECA units are known in the art and are commercially available from a number of manufacturers and suppliers. Suitably the activation unit generates a catholyte and an anolyte from a brine solution.
  • ECA electrochemically activated
  • ECA water solution electrochemically activated
  • electrochemical oxidizing water includes solutions generated from the action of the electrochemical activation unit on the brine solution such as, for example, an anolyte comprising a concentration of available chlorine and a catholyte having a concentration of caustic.
  • An “anolyte” as used herein includes the solution that is produced in the electrochemical activation unit at the anode, and suitably comprises a concentration of free chlorine.
  • a “catholyte” as used herein includes the solution that is produced in the electrochemical activation at the cathode, and suitably comprises a concentration of caustic.
  • Brines as used herein relates to an aqueous solution that includes some concentration of a salt such as, for example, an alkali metal chloride (e.g., NaCl, KC1, or LiCl).
  • a salt such as, for example, an alkali metal chloride (e.g., NaCl, KC1, or LiCl).
  • Brines can be generated manually to have a particular salt concentration and/or conductivity and can be readily determined and prepared by one of ordinary skill in the art (e.g., by addition of salts as solids or concentrated solutions to water to achieve a desired composition). Brines can also be derived from a natural source such as, for example, tap water or well water sources.
  • a brine can comprise a conductivity of about 3 to about 5 mS/cm.
  • a "dosing pump” as used herein includes any pump that can circulate a liquid at a particular flow rate, such as a peristaltic pump or a metering pump.
  • a "controller unit” as used herein includes any programmable controller that is suitable for use in monitoring and/or controlling automation of electromechanical processes, for example in response to an input condition/signal.
  • a "chlorine probe” as used herein includes an electrochemical sensor (electrode) suitable for measuring the chlorine concentration in water, as generally known in the art. In some embodiments a chlorine probe exhibits certain performance characteristics as described herein.
  • a "chlorine tank” as used herein includes a tank that contains a chlorine working solution (or anolyte use solution), such as is found in some clean-in-place systems.
  • a "caustic” as used herein includes a basic solution (e.g., high pH), suitably hydroxide solution.
  • "Maintaining" when used herein with respect to “maintaining" a concentration of available chlorine also includes continuous and/or periodic monitoring of the concentration of available chlorine in a solution to ensure the concentration remains at or near a particular level or threshold (e.g., within 10% of a desired concentration, above a particular minimum threshold concentration, etc.).
  • a particular level or threshold e.g., within 10% of a desired concentration, above a particular minimum threshold concentration, etc.
  • an industrial cleaning system comprising: an electrochemical activation unit that is capable of generating an anolyte from a brine solution, the anolyte having a concentration of available chorine; an anolyte dosing pump that is connected to the electrochemical activation unit; a chlorine probe capable of measuring the concentration of available chlorine in a diluted anolyte (or anolyte use solution); and a controller unit operatively coupled to the chlorine probe and the anolyte dosing pump, wherein the controller unit activates the anolyte dosing pump when the measured concentration of available chlorine is lower than a predetermined concentration of available chlorine.
  • the chlorine probe can be selected from any type of commercially available chlorine probe (electrode) that can provide a linear or substantially linear response to the concentration of available chlorine in ranges of about 1 ppm to about 50 ppm or more, and a flat or substantially flat response to changes in pH from about 5-9 (i.e., where changes in pH do not cause a change in detected chlorine concentration).
  • the concentration of available chlorine can be, for example, about 1 ppm, 2 ppm, 3 ppm, 4 ppm, 5 ppm, 6 ppm, 7 ppm, 8 ppm, 9 ppm, 10 ppm, 11 ppm, 12 ppm, 13 ppm, 14 ppm, 15 ppm, 16 ppm, 17 ppm, 18 ppm, 19 ppm, 20 ppm, 21 ppm, 22 ppm, 23 ppm, 24 ppm, 25 ppm, 26 ppm, 27 ppm, 28 ppm, 29 ppm, 30 ppm, 31 ppm, 32 ppm, 33 ppm, 34 ppm, 35 ppm, 36 ppm, 37 ppm, 38 ppm, 39 ppm, 40 ppm, 41 ppm, 42 ppm, 43 ppm, 44 ppm, 45 ppm, 46 ppm, 47 ppm, 48 ppm
  • Substantially linear response includes a response that provides a concentration of available chlorine within 15% (including all values to within 1%) of the particular available chlorine concentration.
  • a “linear response” typically includes a response that provides a concentration of available chlorine within 1% of the particular available chlorine concentration, or alternatively within the known tolerance/error of the chlorine probe.
  • a linear or substantially linear response can be evaluated using a series of standard or stock chlorine solutions of known concentration, or evaluated using another method or kit for determining chlorine concentration such as, for example, colorimetric methods, titration (amperometric, iodometric, etc.), orthotolidine, syringaldazine (FACTS), or other methods and kits that are known in the art and/or commercially available (e.g., from Hach Company).
  • the probe can provide a chlorine concentration response that is flat or substantially flat in response to changes in solution pH including, for example, pH values from about 5.0, 5.1, 5.2, 5.3, 5.4, 5.5, 5.6, 5.7, 5.8, 5.9, 6.0, 6.1, 6.2, 6.3, 6.4, 6.5, 6.6, 6.7, 6.8, 6.9, 7.0, 7.1, 7.2, 7.3, 7.4, 7.5, 7.6, 7.7, 7.8, 7.9, 8.0, 8.1, 8.2, 8.3, 8.4, 8.5, 8.6, 8.7, 8.8, 8.9, or about 9.0.
  • the probe provides a flat or substantially flat response to the concentration of available chlorine in solutions having a pH range of about 4 to about 9, about 5 to about 9, about 6 to about 8, about 6.5 to about 8, about 6.5 to about 7.5, or about 7 to about 7.5.
  • the probe provides a flat or substantially flat response in a solution having about a neutral pH or alternatively, a pH of a local water source (e.g., tap water, well water, and the like).
  • a probe having a "flat or substantially flat response” relates to chlorine probes that provide a reading or measurement of chlorine concentration that does not vary substantially in response to a change in solution pH.
  • a flat or substantially flat response relates to 0% to about 10% variance in chlorine concentration over a pH range, including all values falling within that range, (e.g., about 0.01, 0.05, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.25, 1.5, 1.75, 2.0, 2.5, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0, or about 10%>).
  • a flat or substantially flat response relates to a variance of no more than about 10% in chlorine concentration over a pH range.
  • a flat or substantially flat response relates to 0% to about 5% variance in chlorine concentration over a pH range, including all values falling within that range, (e.g., about 0.01, 0.05, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.25, 1.5, 1.75, 2.0, 2.5, 3.0, 4.0, or about 5.0%).
  • a flat or substantially flat response relates to a variance of no more than about 5% variance in chlorine concentration over a pH range.
  • a non-limiting example of a chlorine probe includes a TARAline chlorine probe manufactured by Reiss GmbH in Weinheim, Germany.
  • Other chlorine probes are similarly useful in the systems and methods described herein as long as they provide a linear or substantially linear response to the concentration of available chlorine and a flat or substantially flat response over a range of solution pH values such as, for example, the conditions described herein.
  • the probe can be set up using a single calibration based on the source of available water (e.g., local tap water source, well water, and the like) and/or brine solution.
  • the predetermined concentration of available chlorine can be determined/identified by one of skill in the art depending on the particular cleaning that is necessary or desired (e.g., light cleaning, heavy cleaning, etc.) as well as the industrial equipment and soils that are to be cleaned.
  • the predetermined concentration is a value within the linear or substantially linear range of the chlorine probe.
  • the predetermined concentration is a value within the linear or substantially linear range of the chlorine probe in a solution within a pH range in which the chlorine probe has a flat or substantially flat response with respect to changes in pH.
  • the predetermined value is about 40 ppm at a pH range of about 4 to about 9, about 5 to about 9, about 6 to about 8, about 6.5 to about 8, about 6.5 to about 7.5, or about 7 to about 7.5.
  • the predetermined value can be adjusted to a higher or lower value (e.g., about 10 ppm, 11 ppm, 12 ppm, 13 ppm, 14 ppm, 15 ppm, 16 ppm, 17 ppm, 18 ppm, 19 ppm, 20 ppm, 21 ppm, 22 ppm, 23 ppm, 24 ppm, 25 ppm, 26 ppm, 27 ppm, 28 ppm, 29 ppm, 30 ppm, 31 ppm, 32 ppm, 33 ppm, 34 ppm, 35 ppm, 36 ppm, 37 ppm, 38 ppm, 39 ppm, 40 ppm, 41 ppm, 42 ppm, 43 ppm, 44 ppm, 45 ppm, 46 ppm, 47 ppm, 48 ppm, 49 ppm, 50 ppm, 51 ppm, 52 ppm, 53 ppm, 54 ppm, 55 ppm,
  • the system further comprises a tank, such as a chlorine tank, that receives the anolyte from the anolyte dosing pump and an optional water source for dilution of anolyte to particular desired concentrations or pH ranges.
  • the chlorine tank suitably contains a working anolyte solution for various methods described herein, such as clean-in-place (CIP).
  • CIP clean-in-place
  • a chlorine tank can be used to recycle/recover anolyte solution after a cleaning application, or alternatively can provide a single use solution (i.e., subsequently routed for disposal).
  • the industrial cleaning generally includes an electrochemical activation unit that is capable of generating an anolyte from a brine solution.
  • ECA unit Any known and commercially available ECA unit can be used in connection with the instant disclosure.
  • FIG. 1 is a schematic representation of one embodiment of a cleaning-in-place system or industrial cleaning or cleansing system 10 that can be adapted for any industrial setting such as, for example, a food production facility or a beverage facility (e.g., a soft-drink production facility).
  • a food production facility or a beverage facility e.g., a soft-drink production facility.
  • the industrial cleaning system 10 includes an electrochemical activation unit 12 that receives reverse osmosis (RO) water or softened water and sodium chloride (NaCl), and passes the resulting brine solution through an electrolytic cell 14.
  • RO reverse osmosis
  • NaCl sodium chloride
  • the electrochemical activation unit 12 generates at the anode side 15 an anolyte that has a concentration of hypochlorous acid, by the following reaction:
  • the electrochemical activation unit 12 also generates at the cathode side 17 a catholyte that has a concentration of hydroxide or caustic, by the following reaction:
  • the anolyte and the catholyte are separated in the electrochemical activation unit 12 by a permeable membrane 16.
  • the electrochemical activation unit 12 thus forms a dual-stream system that generates both the anolyte and the catholyte, the anolyte having a concentration of available chlorine and the catholyte having a concentration of caustic.
  • the electrochemical activation unit 12 does not include a membrane 16 that separates the anolyte and the catholyte, thereby forming a single-stream system.
  • the acid generated at the anode side 15 is neutralized by the hydroxide at the cathode side 17.
  • the concentrations of the anolyte and catholyte can be proportionate to factors such as the brine flow rate and salt concentration in the feed solution.
  • the electrochemical activation unit 12 can generate a catholyte concentrate that has a concentration of caustic in the amount of about 800 to about 1000 ppm. Other caustic concentrations are possible depending on the usage requirements or operating parameters of the electrochemical activation unit 12.
  • the hydrogen gas generated at the cathode can be about 400 ppm.
  • the electrochemical activation unit 12 can generate an anode concentrate that has a concentration of hypochlorous acid in the amount of about 600 to about 800 ppm.
  • the anolyte in its raw form has a pH of about 2. This can be corrosive to industrial equipment that are made, of or contain components that are made of, soft metals and stainless steel (e.g., equipment in food and beverage processing applications).
  • the anolyte can be blended with the catholyte. In one embodiment, 60% of the generated catholyte is added to the anolyte, bringing the anolyte to a pH of about 4.0 to about 7.0.
  • the anolyte is also diluted with tap water, bringing it to a pH of about 6.5 to about 7.5.
  • some embodiments provide for an anolyte that is diluted and/or buffered so as not to be corrosive to metals, such as those used in industrial manufacturing equipment.
  • other well known components can be added to anolyte solutions (e.g., surfactants, builders, stabilizers) so long as those components do not affect the response of the probe to chlorine concentration, as described herein.
  • the industrial cleaning system 10 further includes an anolyte dosing pump 18 that is connected to the electrochemical activation unit 12.
  • the anolyte can then be streamed to an anolyte dosing pump 18 that is connected to the electrochemical activation unit 12.
  • the anolyte dosing pump 18 can send the anolyte to a chlorine tank 20.
  • the industrial cleaning system 10 further includes a water source and a water flow meter 22 that is connected to the chlorine tank 20.
  • the chlorine tank 20 thus receives anolyte from the anolyte dosing pump 18 and can further dilute the anolyte into an anolyte working solution.
  • the anolyte may flow directly from the electrochemical activation unit 12 to contact the industrial production system without requiring the chlorine tank 20.
  • the anolyte concentrate from the electrochemical activation unit 12 in this case can be diluted directly from a water source that is controlled, for example, by a water flow meter.
  • the industrial cleaning system 10 further includes a controller unit that acts (action/signal depicted by 28) and is operatively coupled to the anolyte dosing pump 18 and a chlorine probe 30.
  • the chlorine probe 30, discussed herein is capable of measuring the concentration of available chlorine in the anolyte working solution of the chlorine tank 20 (or anolyte that is otherwise diluted to form an anolyte working solution). When the measured concentration of available chlorine is lower than a predetermined concentration of available chlorine, the controller unit 28 activates the anolyte dosing pump 18 to provide an additional amount of available chlorine to the anolyte working solution.
  • the predetermined concentration of available chlorine can be suitably about 40 ppm at a pH range of about 4.0 to about 9.0.
  • the predetermined concentration of available chlorine can also be about 40 ppm at a pH range of about 5 to about 9, about 6 to about 8, about 6.5 to about 8, about 6.5 to about 7.5, or about 7 to about 7.5.
  • An anolyte working solution with this concentration of available chlorine e.g., at least 40 ppm
  • the water flow meter 22 can generate a signal for the controller unit 28 to initially charge the chlorine tank 20 with a proportionally controlled volume of water from the water flow meter 22 and anolyte from the anolyte dosing pump 18. Subsequently, the controller unit 28 controls makeups of the anolyte working solution by monitoring the concentration of available chlorine through the chlorine probe 30. The controller unit 28 can thus automate the monitoring and controlling of the anolyte working solution in a user- friendly manner.
  • the industrial cleaning system 10 may include a catholyte dosing pump 32 that is operatively coupled to the controller unit 28.
  • the catholyte dosing pump 32 can be activated by the controller unit 28 by conductivity when the concentration of caustic is lower than a predetermined concentration of caustic.
  • the catholyte can be an effective cleaner for sugar-based soil such as soft-drink concentrates, and other water-soluble soils such as coffee, milk, and soy milk.
  • additives containing surfactants, builders and/or other functional cleaning components such as Kompleet or Brightwash, both available from Diversey (Sturtevant, WI) can be used with the catholyte.
  • Increasing the temperature of the catholyte, for example to 50°C, can also have a positive effect on the cleaning properties of the catholyte.
  • the catholyte can also be diluted with water.
  • the anolyte working solution flows from the chlorine tank 20 through a cleaning-in-place pump 24 and cleaning-in-place flow meter 26 to contact the industrial equipment (e.g., food and beverage production system).
  • the anolyte working solution can return from the industrial production system to the chlorine tank 20, as shown in the extended dashed arrow 36.
  • the anolyte working solution can also be for single use, not returning to the chlorine tank 20, as shown in the solid arrow 34.
  • the industrial cleaning system 10 includes a chlorine probe capable of measuring the chlorine concentration in a diluted anolyte solution. While the oxidizing potential of the particular species of available chlorine is the same, the particular efficacy in microbial control is different between various chlorine species.
  • the anolyte working solution is generally in the pH range of about 4.0 to about 9.0, about 5 to about 9, about 6 to about 8, about 6.5 to about 8, about 6.5 to about 7.5, or about 7 to about 7.5 where the hypochlorous acid is in equilibrium with the hypochlorite anion OC1 " .
  • the chlorine probe suitably measures chlorine concentration with a linear or substantially linear response to changes in chlorine concentration, and provides a flat or substantially flat response for chlorine concentrations over a range of solution pH (e.g., see FIG. 4A, contrast from FIG. 4B).
  • each chlorine species can follow a different response curve as a function of the pH of the anolyte working solution.
  • available chlorine consists predominantly of HOC1 and chlorine gas (Cl 2(g) ).
  • OC1 " starts to dominate, and above a pH of 9.5, available chlorine consists almost entirely of OC1 " .
  • the disclosure relates to a method for maintaining the concentration of available chlorine in an industrial cleaning system, wherein the method comprises providing an electrochemically activated solution comprising an amount of available chlorine; measuring the concentration of available chlorine in the solution using a chlorine probe, wherein the chlorine probe has a linear or substantially linear response to the concentration of available chlorine up to at least 50 ppm or more, and a flat or substantially flat response to changes in solution pH (i.e., changes in pH from about 5-9 do not cause a change in detected chlorine concentration); and providing an additional amount of available chlorine to the system when the measured concentration is lower than a predetermined concentration of available chlorine.
  • the method is used in a system for a CIP method.
  • the flat or substantially flat response is at a pH range of about 4 to about 9, about 5 to about 9, about 6 to about 8, about 6.5 to about 8, about 6.5 to about 7.5, or about 7 to about 7.5.
  • the method generally includes providing an electrochemically activated solution comprising an amount of available chlorine, optionally diluting the solution, measuring and/or monitoring the concentration of available chlorine in the solution using the chlorine probe 30, and providing an additional amount of available chlorine to the system when the measured concentration is lower than a predetermined concentration of available chlorine.
  • the general method disclosed herein can be adapted to or incorporated into any number of cleaning methods that can comprise other steps that are known in any cleaning protocol such as, for example, CIP (e.g., soaking, pretreatment, rinses, etc.).
  • CIP e.g., soaking, pretreatment, rinses, etc.
  • the chlorine probe exhibits a substantially flat response to available chlorine up to at least about 50 ppm within pH range of about 4.0 to about 9.0.
  • the chlorine probe 30 has a substantially flat response to available chlorine up to at least 50 ppm at a pH of about 4 to about 9, about 5 to about 9, about 6 to about 8, about 6.5 to about 8, about 6.5 to about 7.5, or about 7 to about 7.5.
  • Tables 2-4 The data plotted in Fig. 4A is summarized in Tables 2-4 in the Examples below.
  • the chlorine probe can be a single electrode calibrated for the anolyte working solution, showing a response in less than about 2 minutes.
  • the temperature exposure of the chlorine probe can be limited to less than 45°C, but is suitably robust up to about 50°C with some embodiments providing for a chlorine probe that can self- compensate for temperature.
  • the chlorine probe used to measure/monitor the amount of available chlorine is suitably coupled to (i.e., is in electronic communication with) any suitable programmable logic controller unit known in the art such as, for example, Webmaster manufactured by Walchem in Hollison, Massachusetts; BiOx from Diversey (Sturtevant, WI); or LABView manufactured by National Instruments in Austin, Texas.
  • any suitable programmable logic controller unit known in the art such as, for example, Webmaster manufactured by Walchem in Hollison, Massachusetts; BiOx from Diversey (Sturtevant, WI); or LABView manufactured by National Instruments in Austin, Texas.
  • the logic controller in response to one or more chlorine concentration reading inputs from the probe, can initiate an adjustment (increase or decrease) in the amount of anolyte added to the use solution (e.g., via a dosing pump), the amount of dilution water, or the amount of catholyte, depending on the predetermined value of chlorine concentration used in the method.
  • the aspects disclosed herein also provide a method for cleaning a system, the method comprising: providing an electrochemically activated solution having a concentration of available chlorine; determining a concentration of available chlorine that is suitable for cleaning at a given pH of the electrochemically activated solution; measuring the concentration of available chlorine in the electrochemically activated solution; activating a dosing pump when the measured concentration of available chlorine is lower than the determined concentration of available chlorine; and contacting the system with the electrochemically activated solution for a time or in an amount sufficient to provide an amount of cleaning.
  • the method includes a second electrochemically activated water solution provided at a concentration that is suitable for optional dilution with water.
  • the second ECA solution comprises catholyte.
  • the method can be used for cleaning a system that comprises manufacturing, production, or conveyance equipment.
  • the equipment is used in the food or beverage industry.
  • the method is used in a clean-in- place system.
  • a test apparatus including a recirculation pump, a chlorine probe and a fluid reservoir was assembled.
  • the recirculation pump was a magnetic drive pump [Model MD20RZT-115NL, Iwaki] capable of maintaining a continuous flow of 0.5 L/min across the face of the chlorine probe.
  • Table 1 shows that the pH of the diluent water was experimentally adjusted at a titrated chlorine concentration of 52.5 ppm.
  • the ratio of measured concentration to titrated concentration in this case showed a linear correlation to the pH (measured using a pH meter [model 51875-60, Hach Company]).
  • the chlorine probe was calibrated at a given pH of the diluent water (in Sturtevant, WI). Within a range of the calibrated pH, the chlorine probe thus suitably maintains the ratio of measured concentration to titrated concentration close to 1.000 (a flat or substantially flat response).
  • test solution was then discarded and replaced with a fresh 5 litres of selected diluent water.
  • a fresh sample of mixed anolyte was collected from the ECA unit and the above cycle was repeated.
  • Table 2 summarizes measurements of the TARAline chlorine probe for various mixed anolyte solutions diluted by tap water (Sturtevant, WI).
  • Table 3 summarizes measurements of the TARAline chlorine probe for various olyte solutions diluted by water that includes 200 ppm of HCO 3 " and 0 ppm of hardness.
  • Table 4 summarizes measurements of the TARAline chlorine probe for various mixed anolyte solutions diluted by water that includes 200 ppm of HCO 3 " and 200 ppm of hardness.
  • the data above for the TARAline chlorine probe demonstrates that it has a linear or substantially linear and flat or substantially flat response over relevant available chlorine concentrations and solution pH, and can be used in the systems and methods described herein.
  • the methods and apparatus disclosed herein provide and establish a linearity between the amperometric signal and the read out of available chlorine within a pH range (exemplified above in a range from slightly acidic to slightly alkaline) and at available chlorine concentrations typical for CIP applications (e.g. about 40 ppm for a sanitizing step in CIP).
  • the methods and apparatus disclosed herein do not require additional buffers or equipment (e.g., acidification units) for proper operation.

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Abstract

L'invention concerne des systèmes et des procédés utiles pour le nettoyage, la désinfection et/ou le contrôle microbien d'équipements industriels tels que par exemple les systèmes de transport et de production/fabrication.
EP12771682.7A 2011-04-12 2012-04-12 Système et procédé pour nettoyage industriel Withdrawn EP2697409A4 (fr)

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US20140026971A1 (en) 2014-01-30

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