Production system of electrolyzed water

Abstract

An electrolyzed water production system comprises a water treatment device, a treated water storage barrel, a sterilization unit and an electrolysis device. The water treatment equipment is suitable for carrying out water quality treatment on raw water, so that the raw water becomes treated water. The treated water storage tank is in fluid communication with the water treatment equipment and is suitable for containing the treated water. The sterilization unit is in fluid communication with the treated water storage tank and is adapted to sterilize treated water flowing out of the treated water storage tank with ultraviolet rays. The electrolysis device is in fluid communication with the sterilization unit and is suitable for electrolyzing the sterilized treated water into electrolyzed water. An existing ozone sterilization mode is replaced with an ultraviolet sterilization mode, and due to the fact that ozone sterilization is not needed, the problem that bromate exceeds the standard is solved.

Description

Technical Field

[0001] The utility model relates to a production system of drinking water / packaged water, in particular to a production system of electrolyzed water. Background Art

[0002] Among them, drinking water such as alkaline ionized water needs to be disinfected and sterilized during production to ensure hygiene and safety and comply with regulations. Currently, most existing disinfection and sterilization methods use chlorine or oxygen disinfectants for disinfection. However, chlorine disinfectants will make the taste of drinking water unpleasant due to residual chlorine, so the more popular disinfection method nowadays is ozone disinfection.

[0003] See also Figure 1 . Figure 1 The present invention is a simplified schematic diagram of an existing electrolyzed water production system. The electrolyzed water production system comprises a water treatment device 11, a storage tank 12 located downstream and connected to the water treatment device 11, and an electrolysis device 13 located downstream and connected to the storage tank 12. The ozone disinfection is mostly carried out by introducing ozone disinfection into the storage tank 12 after the water treatment of the water treatment device 11 is completed.

[0004] After the water in the storage tank 12 is introduced into the ozone disinfection, there will be residual ozone in the water, so it can be ensured that the water will be sterile when it flows in the pipeline, electrolyzed or even filled. However, ozone disinfection is not foolproof because the bromide ions (Br - ) is easily oxidized by ozone and forms bromate (BrO3 - ) and combines with cations in water to form bromate, which has carcinogenic risk. Therefore, drinking water produced by ozone disinfection needs to be further improved. Summary of the invention

[0005] The purpose of the present invention is to improve at least one disadvantage of the prior art.

[0006] The utility model discloses an electrolyzed water production system, which is suitable for producing electrolyzed water with raw water, and comprises a water treatment device, a treated water storage barrel, and an electrolysis device, wherein the water treatment device is suitable for treating the raw water so that the raw water becomes treated water, the treated water storage barrel is fluidically connected to the water treatment device, and is suitable for containing the treated water, the electrolysis device can produce electrolyzed water, and the electrolyzed water production system further comprises a sterilization unit which is fluidically connected between the treated water storage barrel and the electrolysis device, the sterilization unit is suitable for sterilizing the treated water flowing out of the treated water storage barrel by at least one of filtering and ultraviolet rays, the electrolysis device is suitable for electrolyzing the treated water sterilized by the sterilization unit into electrolyzed water, the electrolysis device comprises a plurality of electrolysis units which are fluidically connected to the treated water storage barrel through the sterilization unit and are connected in parallel with each other and can electrolyze the treated water into electrolyzed water, and a plurality of sterilization units which are located downstream and fluidically connected to the electrolysis units respectively.

[0007] The electrolyzed water production system described in the utility model, the water treatment equipment includes a raw water storage barrel suitable for storing the raw water, and a first water treatment unit and a second water treatment unit that are fluidically connected between the raw water storage barrel and the treated water storage barrel, the first water treatment unit includes water softening treatment, and the second water treatment unit does not include water softening treatment.

[0008] In the electrolytic water production system of the utility model, each electrolysis unit comprises a plurality of electrolyzers connected in parallel.

[0009] In the electrolyzed water production system of the utility model, each of the sterilization units can sterilize the electrolyzed water by filtering the electrolyzed water multiple times and irradiating the electrolyzed water with ultraviolet rays multiple times.

[0010] The electrolyzed water production system of the utility model is suitable for use with additives. The electrolysis equipment also includes an addition tank connected to the electrolysis unit by fluid, and the addition tank is suitable for allowing the additive to be input into the electrolysis unit.

[0011] The electrolyzed water production system described in the utility model also includes a filling device, a control unit whose fluid is connected between the filling device and the sterilization unit, and a storage device whose fluid is connected to the control unit. The control unit can control the electrolyzed water flowing out of the sterilization unit to flow to the filling device or the storage device.

[0012] The electrolyzed water production system described in the utility model comprises a control unit comprising a first control valve and a second control valve which are respectively fluidly connected to the sterilization unit and are spaced from each other, a third control valve which is fluidically connected to the first control valve, the second control valve and the filling device, and a connecting pipeline which fluidly connects the first control valve, the second control valve and the third control valve to each other.

[0013] In the electrolyzed water production system of the utility model, the control unit also includes a steam source which is fluidically connected to the first control valve, the second control valve and the third control valve.

[0014] In the electrolyzed water production system of the utility model, the first control valve and the second control valve are fluidly connected to the water treatment equipment or the treated water storage tank.

[0015] The beneficial effect of the utility model is that the existing ozone sterilization treatment method is replaced by filtration or ultraviolet sterilization methods, and because ozone sterilization is not used, there will be no problem of excessive bromate. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Other features and beneficial effects of the present invention will be clearly presented in the embodiments with reference to the accompanying drawings, in which:

[0017] Figure 1 is a schematic diagram illustrating an existing electrolyzed water production system;

[0018] Figure 2 It is a device circuit diagram, which illustrates an embodiment of the electrolytic water production system of the utility model;

[0019] Figure 3 This is a device circuit diagram, enlarged to illustrate Figure 2 A water treatment device, a treated water storage tank, and a sterilization unit are shown in the figure. The complex circuit design is simplified in the figure, mainly showing the connection relationship between the various devices;

[0020] Figure 4 This is a device circuit diagram, enlarged to illustrate Figure 2 An electrolysis device in the figure, which simplifies the complex circuit design and mainly illustrates the connection relationship between the various devices; and

[0021] Figure 5 This is a device circuit diagram, enlarged to illustrate Figure 2 The figure shows a control unit and a storage device. The complex circuit design is simplified in the figure, mainly illustrating the connection relationship between the devices. DETAILED DESCRIPTION

[0022] See also Figure 2An embodiment of the electrolyzed water production system of the utility model is suitable for producing electrolyzed water with raw water. The raw water refers to water from a water source that has not been treated. The water source that has not been treated can be, for example, surface water sources or underground water sources such as river water, lake water, reservoir water, underground stream water, spring water, and well water. The electrolyzed water refers to water that has been electrolyzed during the production process. The water quality treatment is, for example, but not limited to, one or several of the treatment methods such as precipitation, softening, filtration, and sterilization.

[0023] The electrolyzed water production system includes a water treatment device 2, a treated water storage tank 3 fluidly connected to the water treatment device 2, a sterilization unit 4 fluidly connected to the treated water storage tank 3, an electrolysis device 5 located downstream and fluidly connected to the sterilization unit 4, a control unit 6 located downstream and fluidly connected to the electrolysis device 5, a storage device 7 fluidly connected to the control unit 6, a filling device 81 located downstream and fluidly connected to the control unit 6, an in-situ cleaning device 82 (Clean in Place) fluidly connected to the water treatment device 2, and an ultra-high temperature sterilization device 83 (Ultra-High Temperature) fluidly connected to the filling device 81.

[0024] See also Figure 2 , 3 The water treatment equipment 2 is suitable for treating the raw water, and includes a raw water storage barrel 20 suitable for storing the raw water, and a first water treatment unit 21 and a second water treatment unit 22 located downstream and fluidically connected to the raw water storage barrel 20.

[0025] The first water treatment unit 21 includes a first laminate filter 211, a first activated carbon filter 212, a soft water filter 213, a first filter 214, a reverse osmosis filter 215 (Reverse Osmosis, RO), a first water storage tank 216, and a micron filter 217 which are fluidically connected in sequence.

[0026] The first stacked filter 211 is located downstream and fluidly connected to the raw water storage tank 20. The first filter 214 is a filter with a pore size of about 1 micron. The first water storage tank 216 is fluidly connected between the reverse osmosis filter 215 and the micron filter 217. The micron filter 217 is fluidly connected between the first water storage tank 216 and the treated water storage tank 3. The micron filter 217 is a filter with a pore size of about 0.2 microns.

[0027] The second water treatment unit 22 does not include any soft water filter, and includes a second laminated filter 221, a second activated carbon filter 222, a second filter 223, an ultrafiltration filter 224 (Ultra Filtration, UF), and a second water storage tank 225 which are fluidically connected in sequence.

[0028] The second layer filter 221 is located downstream and fluidly connected to the raw water storage tank 20. The second filter 223 is a filter with a pore size of about 1 micron. The second water storage tank 225 is fluidly connected between the ultrafiltration filter 224 and the treated water storage tank 3.

[0029] The treated water storage tank 3 is fluidly connected to the first water storage tank 216 downstream through the micron filter 217, and the treated water storage tank 3 is directly fluidly connected to the second water storage tank 225 downstream. The treated water storage tank 3 can store treated water obtained by mixing raw water treated by the first water treatment unit 21 and the second water treatment unit 22.

[0030] The sterilization unit 4 includes two sterilizers 41 connected in parallel. The sterilizer 41 is located downstream and fluidically connected to the treated water storage tank 3. Each of the sterilizers 41 uses a low-pressure ultraviolet lamp to sterilize the treated water using ultraviolet rays with a wavelength of about 254 nm. In other embodiments of the present invention, each of the sterilizers 41 can also use a medium-pressure ultraviolet lamp, and the wavelength of the generated ultraviolet rays can be between 200 and 400 nm. For example, an ultraviolet lamp with a wavelength of 240 to 400 nm produced by Atlantium of Israel can be used. In other embodiments of the present invention, the sterilizer 41 can also sterilize the treated water by filtering.

[0031] The low pressure and medium pressure mentioned above are industry terms, which refer to the pressure of the ultraviolet generating medium (such as inert gas) filled in the ultraviolet lamp. Ultraviolet lamps with different pressures can generate different ultraviolet wavelengths.

[0032] See also Figure 2 , 3 4. The electrolysis device 5 includes two electrolysis units 51 which are fluidically connected to the treated water storage tank 3 through the sterilization unit 4 and are connected in parallel to each other and can electrolyze the treated water, an addition tank 52 and a by-product tank 53 which are fluidically connected to the electrolysis units 51, two sterilization units 54 located downstream and fluidically connected to the electrolysis units 51, and a pipe valve unit 55 for connecting the components and controlling the flow of liquid.

[0033] Each of the electrolysis units 51 includes a plurality of (three in this embodiment) electrolyzers 511 connected in parallel. Each of the electrolyzers 511 can electrolyze the treated water into electrolyzed water (alkaline water) and acidic water.

[0034] Each of the sterilization units 54 can sterilize the electrolyzed water by filtering the electrolyzed water in several steps and irradiating the electrolyzed water with ultraviolet rays in several steps. Specifically, each of the sterilization units 54 includes a first micron filter 541, a first ultraviolet sterilizer 542, a second micron filter 543, a second ultraviolet sterilizer 544, and a third micron filter 545 connected in series.

[0035] Each of the first micron filters 541 is a filter with a pore size of about 0.45 microns. Each of the second micron filters 543 and the third micron filter 545 is a filter with a pore size of about 0.2 microns. Each of the first ultraviolet sterilizers 542 uses a low-pressure ultraviolet lamp, and the wavelength of the ultraviolet light generated is about 254 nm. Each of the second ultraviolet sterilizers 544 uses a medium-pressure ultraviolet lamp, and the wavelength of the ultraviolet light generated is 200-400 nm. For example, each of the second ultraviolet sterilizers 544 can use an ultraviolet lamp with a wavelength of 240-400 nm produced by the Israeli Atlantium company as mentioned above.

[0036] The pipe and valve unit 55 includes two water inlet pipes 551 respectively located downstream and fluidly connected to the treated water storage tank 3 for the treated water to flow into the electrolyzer 511 of the electrolysis unit 51, two water inlet liquid valves 552 arranged on the water inlet pipes 551, two water outlet pipes 553 respectively for allowing electrolyzed water to flow out of the electrolyzer 511 of the electrolysis unit 51, two water outlet liquid valves 554 arranged at the ends of the water outlet pipes 553, two sterilization pipes 555 located downstream and fluidly connected between the water outlet liquid valves 554 and the sterilization unit 54, two control liquid valves 556 respectively arranged on the sterilization pipes 555, an addition pipe 557 connected between the addition tank 52 and the water outlet liquid valve 554, a cleaning pipe 558 connected between the addition tank 52 and the water inlet liquid valve 552, and two discharge pipe valve groups 559 connected between the by-product tank 53 and the electrolysis unit 51.

[0037] See also Figure 3 , 4, 5, the control unit 6 includes a first control valve 61, a second control valve 62 and a third control valve 63 spaced apart from each other, a connecting pipeline 64 that fluidly connects the first control valve 61, the second control valve 62 and the third control valve 63 to each other, two water inlet pipelines 65 that fluidly connect the first control valve 61, the second control valve 62 and the sterilization unit 54, a storage pipeline 66 that connects the first control valve 61 and the storage device 7, two return pipelines 67 that fluidly connect the first control valve 61, the second control valve 62 and the treated water storage barrel 3, a steam pipeline 68 that fluidly connects the first control valve 61, the second control valve 62 and the third control valve 63, and a steam source 69 that fluidly connects the steam pipeline 68.

[0038] The storage device 7 includes an electrolyzed water temporary storage tank 71 and a sterile gas source 72 in fluid communication with the electrolyzed water temporary storage tank 71. The sterile gas source 72 can be used to control the internal pressure of the electrolyzed water temporary storage tank 71.

[0039] See also Figure 2 , 3 5. The filling device 81 is fluidically connected to the third control valve 63 of the control unit 6 through a filling pipeline 811. The filling device 81 can fill and package the electrolyzed water into a packaging bottle to produce bottled water.

[0040] The on-site cleaning device 82 is fluidically connected to the first water storage barrel 216 and the second water storage barrel 225 of the water treatment device 2, the treated water storage barrel 3, and the storage device 7 through a cleaning pipeline 821.

[0041] The ultra-high temperature sterilization equipment 83 is connected through a sterilization pipeline 831 (see Figure 2 ) fluid is connected to the filling device 81, so as to sterilize the filling device 81.

[0042] See also Figure 3 , 45. When the present embodiment is in operation, the raw water from the water source will be stored in the raw water storage barrel 20, and then respectively input into the first water treatment unit 21 and the second water treatment unit 22 for water purification. Since the first water treatment unit 21 includes a soft water filter 213 and a reverse osmosis filter 215, the raw water will become pure water without minerals after the water softening treatment and reverse osmosis treatment of the first water treatment unit 21, and will be stored in the first storage barrel. Since the second water treatment unit 22 does not perform water softening treatment, the raw water will become purified water containing minerals after the treatment of the second water treatment unit 22, and will be stored in the second water storage barrel 225. Then, the pure water and purified water are mixed into the treated water, and stored in the treated water storage barrel 3.

[0043] In this embodiment, the treated water is a mixture of the pure water and the clean water. The advantage of this is that the treated water has a better taste when drunk. However, if the taste is not a concern, the treated water can also be the pure water or the clean water after water quality treatment.

[0044] Before the treated water enters the electrolysis unit 51 through the water inlet pipe 551 of the electrolysis device 5 and is electrolyzed, it first passes through the sterilization unit 4 and is sterilized by ultraviolet light by the sterilizer 41 of the sterilization unit 4. Therefore, the first feature of the electrolyzed water production system is that ultraviolet light is used for sterilization instead of ozone, so there will be no problem of excessive bromate caused by ozone sterilization.

[0045] After the treated water is input into the electrolysis unit 51 through the water inlet pipe 551 of the electrolysis unit 51, it is electrolyzed into alkaline electrolyzed water and acidic acidic water by the electrolyzer 511 of the electrolysis unit 51. The second feature of the electrolyzed water production system is that the electrolyzers 511 are connected in parallel with each other through the water inlet pipe 551, and can electrolyze the treated water into electrolyzed water at the same time, thereby increasing the production per unit time.

[0046] The alkaline electrolyzed water produced after electrolysis will flow to the sterilization unit 54 through the outlet pipe 553 and the sterilization pipe 555, while the acidic acidic water will flow to the byproduct tank 53 through the discharge pipe valve group 559. The third feature of the electrolyzed water production system is that the byproduct tank 53 is suitable for containing the acidic water produced after the treated water is electrolyzed, which can be used to further produce byproducts such as hypochlorous acid (water) to increase revenue.

[0047] The fourth feature of the electrolyzed water production system is that the addition tank 52 is fluidly connected to the water outlet valve 554 through the addition pipeline 557, so the addition tank 52 can add additives (such as calcium salt) into the electrolyzed water. In addition, the addition tank 52 is also fluidly connected to the water inlet valve 552 through the cleaning pipeline 558, so the addition tank 52 is also suitable for introducing a cleaning agent (such as citric acid) into the electrolyzer 511 of the electrolysis unit 51 to clean the scale stuck in the electrolyzer 511.

[0048] After the electrolyzed water flows into the sterilization unit 54 of the electrolysis device 5, it can be sterilized again by the sterilization unit 54 to ensure a sterile state. Among them, the first micron filter 541 of each of the sterilization units 54 has the effect of blocking dirt. The second micron filter 543 and the first ultraviolet sterilizer 542 of each of the sterilization units 54 are the first checkpoints for filtering / killing bacteria. The second ultraviolet sterilizer 544 and the third micron filter 545 of each of the sterilization units 54 are the second reinforcement checkpoints for filtering / killing bacteria.

[0049] After the electrolyzed water is sterilized by the sterilization unit 54 of the electrolysis device 5, it will flow to the first control valve 61 and the second control valve 62 through the water inlet pipeline 65 of the control unit 6. Under normal conditions, the electrolyzed water flowing to the first control valve 61 and the second control valve 62 will flow to the third control valve 63 through the connecting pipeline 64 of the control unit 6, and finally flow into the filling device 81 through the filling pipe 811 of the filling device 81. At this time, the steam source 69 of the control unit 6 will provide steam to the first control valve 61, the second control valve 62 and the third control valve 63 through the steam pipeline 68, blocking the electrolyzed water from flowing into the storage pipeline 66 and the return pipeline 67.

[0050] Among them, when the filling device 81 located downstream has a problem and cannot be filled immediately to consume electrolyzed water. The steam source 69 of the control unit 6 will provide steam to the third control valve 63 through the steam pipeline 68, so that the third control valve 63 blocks the electrolyzed water from flowing into the filling pipeline 811, and at the same time, the first control valve 61 will switch to connect the storage pipeline 66 with the connecting pipeline 64. In this abnormal state, the electrolyzed water continuously delivered by the electrolysis device 5 will be able to flow to the electrolyzed water temporary storage tank 71 through the connecting pipeline 64 and the storage pipeline 66 for temporary storage. When the problem of the filling device 81 is eliminated and the packaged water can be filled normally, the third control valve 63 can be opened again, so that the electrolyzed water temporarily stored in the electrolyzed water temporary storage tank 71 can be delivered to the filling device 81 for filling. When the electrolyzed water in the electrolyzed water temporary storage tank 71 is completely consumed, the first control valve 61 can again use steam switching to prevent the electrolyzed water from flowing into the electrolyzed water temporary storage tank 71 .

[0051] If the filling device 81 still cannot eliminate the problem after a period of time, resulting in the electrolyzed water temporary storage tank 71 being full and unable to continue to store, the first control valve 61 will switch so that the electrolyzed water cannot flow to the storage pipeline 66 and the connecting pipeline 64, and can only flow to one of the return pipelines 67, and the second control valve 62 will switch so that the electrolyzed water cannot flow to the connecting pipeline 64, and can only flow to the other return pipeline 67. In this way, the electrolyzed water that cannot continue to be temporarily stored in the electrolyzed water temporary storage tank 71 will flow back to the treated water storage tank 3 through the return pipeline 67 (see Figure 3 Schematic diagram).

[0052] The fifth feature of the electrolyzed water production system is that through the unique layout design of the pipeline and control valve of the control unit 6, combined with the storage device 7, a first line of defense can be established when the filling device 81 has a problem, so that the electrolyzed water temporary storage tank 71 can accommodate the continuously produced electrolyzed water without directly discharging the excess electrolyzed water, thereby avoiding wasting water resources and increasing production costs.

[0053] The sixth characteristic of the electrolyzed water production system is that when the first line of defense, i.e., the electrolyzed water temporary storage tank 71, is insufficient to continuously accommodate more electrolyzed water, the electrolyzed water can flow back to the treated water storage tank 3. In this way, the electrolyzed water flowing back to the treated water storage tank 3 will be sterilized / filtered out bacteria by the sterilization unit 4 and the sterilization unit 54 as described above, which can ensure sanitation and safety. At the same time, it can also avoid the waste of water resources.

[0054] Before the electrolyzed water production system starts operation, or during annual maintenance, or when there is other need, the on-site cleaning equipment 82 can be used to introduce hot water or steam sufficient to kill bacteria into the aforementioned pipelines / pipelines / ducts, and the first water storage tank 216, the second water storage tank 225, the treated water storage tank 3, and the storage device 7 that are fluid-connected to the on-site cleaning equipment 82 can be cleaned for disinfection and sterilization.

[0055] In summary, the beneficial effect of the electrolyzed water production system of the utility model is that it replaces the existing ozone sterilization treatment method with filtration or ultraviolet sterilization methods. Because ozone sterilization is not used, there will be no problem of excessive bromate.

[0056] The above is only a specific implementation of the present invention, and cannot be used to limit the scope of the claims of the present invention. Equivalent changes made according to the claims of the present invention and the contents of the specification should also be covered by the scope of the claims of the present invention.

Claims

1. An electrolyzed water production system, suitable for producing electrolyzed water from raw water, and comprising a water treatment device, a treated water storage tank, and an electrolysis device, wherein the water treatment device is suitable for treating the raw water to make the raw water treated water, the treated water storage tank is fluidically connected to the water treatment device and is suitable for containing the treated water, the electrolysis device can produce electrolyzed water, and is characterized in that: The electrolyzed water production system also includes a sterilization unit that is fluidically connected between the treated water storage barrel and the electrolysis equipment. The sterilization unit is suitable for sterilizing the treated water flowing out of the treated water storage barrel by at least one of filtration and ultraviolet rays. The electrolysis equipment is suitable for electrolyzing the treated water sterilized by the sterilization unit into electrolyzed water. The electrolysis equipment includes a plurality of electrolysis units that are fluidically connected to the treated water storage barrel through the sterilization unit and are connected in parallel to each other and can electrolyze the treated water into electrolyzed water, and a plurality of sterilization units located downstream and fluidically connected to the electrolysis units respectively.

2. The electrolyzed water production system according to claim 1, characterized in that: The water treatment equipment includes a raw water storage barrel suitable for storing the raw water, and a first water treatment unit and a second water treatment unit which are fluidically connected between the raw water storage barrel and the treated water storage barrel. The first water treatment unit includes water softening treatment, and the second water treatment unit does not include water softening treatment.

3. The electrolyzed water production system according to claim 1, characterized in that: Each of the electrolysis units includes a plurality of electrolyzers connected in parallel.

4. The electrolyzed water production system according to claim 1 or 3, characterized in that: Each of the sterilization units can sterilize the electrolyzed water by filtering the electrolyzed water multiple times and irradiating the electrolyzed water with ultraviolet rays multiple times.

5. The electrolyzed water production system according to claim 1 is suitable for use with additives, characterized in that: The electrolysis device further comprises an addition tank in fluid communication with the electrolysis unit, wherein the addition tank is adapted to allow the additive to be input into the electrolysis unit.

6. The electrolyzed water production system according to claim 1, characterized in that: The electrolyzed water production system also includes a filling device, a control unit whose fluid is connected between the filling device and the sterilization unit, and a storage device whose fluid is connected to the control unit. The control unit can control the electrolyzed water flowing out of the sterilization unit to flow to the filling device or the storage device.

7. The electrolyzed water production system according to claim 6, characterized in that: The control unit includes a first control valve and a second control valve which are respectively fluidly connected to the sterilization unit and are spaced from each other, a third control valve which is fluidically connected to the first control valve, the second control valve and the filling device, and a connecting pipeline which connects the first control valve, the second control valve and the third control valve to each other.

8. The electrolyzed water production system according to claim 7, characterized in that: The control unit also includes a steam source in fluid communication with the first control valve, the second control valve, and the third control valve.

9. The electrolyzed water production system according to claim 7, characterized in that: The first control valve and the second control valve are fluidically connected to the water treatment equipment or the treated water storage tank.

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