JP7275525B2 - Drinking water supply system for ships - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drinking water supply system for ships, and more particularly to a drinking water supply system for ships capable of producing delicious drinking water containing an appropriate amount of minerals.

Conventionally, in potable water production equipment for ships that obtains fresh water from seawater, sodium chloride is removed by distillation or RO membrane desalination, but these desalinated waters also remove minerals. It is a strong stimulus to the human body and is not suitable for drinking. Therefore, minerals are artificially added.

However, when minerals are artificially added, water-soluble chemicals are mainly added, and most of them contain chloride ions and sulfate ions as anions. Chloride ions and sulfate ions cause a harsh taste and the like, and there is a problem that the original taste of water cannot be reproduced.

Therefore, it is conceivable to install a large-capacity storage tank for drinking water on the ship and store a sufficient amount of drinking water in it. Not only is it difficult to control the water quality of effluent from storage tanks and stagnant water in the pipes that supply drinking water from storage tanks, but there is also the problem of deterioration of water quality over time, making it difficult to drink. There was a problem that it was not optimal in terms of safety.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a drinking water supply system for ships that can produce delicious drinking water containing an appropriate amount of minerals.

In order to achieve the above object, the present invention is for a ship comprising a seawater desalination apparatus for producing desalinated water from seawater, and a drinking water production apparatus for producing drinking water from the desalinated water supplied from the seawater desalination apparatus. Provided is a drinking water supply system for ships, wherein the drinking water production device includes a carbon dioxide dissolving device and a mineral dissolving means (Invention 1).

According to this invention (Invention 1), it is possible to produce delicious drinking water containing a moderate amount of minerals. This is for the following reasons. That is, as a result of examining the elements that people feel water is delicious, (1) no offensive taste or smell, (2) moderate mineral content (hardness component) is dissolved, and (3) gas component is dissolved. It turned out that it is necessary to satisfy all of the things you are doing. Therefore, by dissolving carbon dioxide gas in the desalinated water with little offensive odor supplied from the seawater desalination device with the carbon dioxide dissolving device and dissolving mineral components such as calcium with the mineral dissolving means, the mineral components are converted into bicarbonate. Because it dissolves, you get delicious drinking water.

In the above invention (invention 1), it is preferable to provide flow rate measuring means for measuring the amount of supply of the desalted water (invention 2). Further, it is preferable that the flow rate measuring means is connected to an arithmetic control device, and that the carbon dioxide gas dissolving device and the mineral dissolving means are controllable by the arithmetic control device (Invention 3).

According to such inventions (inventions 2 and 3), the amount of supplied desalted water is measured and the amount of gas supplied from the carbon dioxide dissolving device is adjusted in accordance with the amount of supplied desalted water to obtain carbonic acid in the desalted water. The concentration can be adjusted to the desired concentration. When minerals are dissolved from the mineral-dissolving means in such carbonated water, the bicarbonate hardness component is eluted, so that the bicarbonate hardness component in the resulting drinking water can be changed. . By these, it is possible to produce delicious drinking water containing moderate mineral content.

In the above inventions (Inventions 1 to 3), it is preferable that an activated carbon cartridge is provided downstream of the carbon dioxide dissolving device and the mineral dissolving means (Invention 4).

According to this invention (Invention 4), it is possible to produce clear-tasting drinking water by removing organic matter and off-flavour components with the activated carbon cartridge.

According to the drinking water supply system for ships of the present invention, carbon dioxide gas is dissolved in the desalinated water with little offensive taste and odor supplied from the seawater desalination apparatus by the carbon dioxide dissolving device, and mineral components such as calcium are dissolved by the mineral dissolving means. Therefore, delicious drinking water can be produced.

BRIEF DESCRIPTION OF THE DRAWINGS It is the schematic which shows the drinking water supply system for ships by 1st embodiment of this invention. It is the schematic which shows the drinking water supply system for ships by 2nd embodiment of this invention.

A first embodiment of a drinking water supply system for ships according to the present invention will be described in detail below with reference to FIG.

FIG. 1 shows a drinking water supply system for vessels according to a first embodiment of the present invention. In FIG. and a drinking water production device 3 for producing drinking water from the desalted water D.

[Seawater desalination equipment]
In the present embodiment, the seawater desalination device 2 is an RO desalination device, and this RO desalination device includes a supply line 21 for seawater S as raw water and a reverse osmosis (RO ) It has a membrane desalination device 22 and a desalted water supply line 23 provided on the permeation side of the RO membrane desalination device 22, and the concentration side of the RO membrane desalination device 22 has a recovery channel 24 and a discharge channel 25 are provided. Reference numeral 26 is a supply pump for the seawater S, reference numeral 27 is an opening/closing valve for the recovery channel 24, and reference numeral 28 is an opening/closing valve for the discharge channel 25.

[Drinking water production equipment]
The drinking water production apparatus 3 includes a carbon dioxide gas cylinder 31 having a regulator 32 as a carbon dioxide dissolving device, and a carbon dioxide gas supply line 33 connected to the carbon dioxide gas cylinder 31 . A carbon dioxide reservoir 34 is arranged in the middle of the carbon dioxide supply line 33, and a carbon dioxide replenishment valve 35A and a carbon dioxide injection valve 35B are provided before and after it. A flow meter 23A as a flow rate measuring means is provided in the middle of the desalted water supply line 23, and the above-mentioned carbon dioxide gas supply line 33 joins at the rear stage of the flow meter 23A.

A mineral cartridge 36 serving as mineral dissolving means is provided at the end of the demineralized water supply line 23 . The mineral cartridge 36 is filled with a solid powdery mineral agent, and the mineral agent can be derived from rocks or from nature. preferred.

Furthermore, an activated carbon cartridge 38 equipped with an MF membrane is provided at the end of a mineral water supply pipe 37 connected to a mineral cartridge 36, and a drinking water supply pipe 39 at the subsequent stage is a point of use such as a faucet or a water cooler. communicates with In FIG. 1, reference numeral 41 denotes an on-off valve for the desalted water supply line 23, reference numeral 42 denotes a desalted water D boosting pump, reference numeral 43 denotes a discharge pipe connected to the drinking water supply pipe 39, Reference numeral 44 is an open/close valve for the drinking water W discharge pipe 43 .

In the drinking water production apparatus 3 as described above, the flowmeter 23A can transmit a pulse signal to the computing device 45 such as a personal computer at every constant flow rate, and the computing device 45 can can be counted to control the opening and closing of various valves such as the carbon dioxide injection valve 35B. The computing device 45 is connected to a display device 46 such as a display, which displays the integrated flow rate of the demineralized water D, the operation status of the drinking water production device 3, and the replacement timing of the carbon dioxide gas cylinder 31, the mineral cartridge 36, and the activated carbon cartridge 38. etc. can be displayed as needed.

[Method for producing drinking water for ships]
Next, a method for producing drinking water using the drinking water supply system for ships according to the present embodiment having the configuration described above will be described below.

First, with the on-off valve 27 of the seawater desalination apparatus 2 opened and the on-off valve 28 closed, the supply pump 26 is driven to supply the seawater S from the supply line 21 to the reverse osmosis (RO) membrane desalination apparatus 22. do. In this RO membrane desalinator 22 , desalted water D is discharged to a desalted water supply line 23 from which minerals, such as calcium and magnesium, that determine the taste of water are removed in addition to sodium chloride in the seawater S.

Next, the on-off valve 41 of the desalted water supply line 23 and the on-off valve 44 of the drinking water W discharge pipe 43 are closed, the carbon dioxide replenishment valve 35A is opened, and the carbon dioxide gas injection valve 35B is closed. A salt water D is fed from a desalted water supply line 23 . After the desalted water D is pressurized by driving the pressurizing pump 42, the flow rate is measured by the flow meter 23A, and when the set integrated flow rate is reached, the carbon dioxide injection valve 35B is opened and Carbon dioxide stored in 34 is mixed with desalted water D and dissolved. As a result, carbon dioxide-dissolved water with a controlled carbon dioxide concentration is produced. Here, the desalted water D is controlled by the arithmetic device 45 so that the concentration of the carbon dioxide in the demineralized water D is about 100 to 500 ppm, thereby increasing the bicarbonate hardness component concentration of the bicarbonate hardness component-containing water in the mineral cartridge 36 to be described later. The desired concentration can be adjusted. By opening the carbon dioxide replenishment valve 35A and closing the carbon dioxide injection valve 35B, the carbon dioxide gas is supplied to the carbon dioxide reservoir 34 up to the pressure set by the regulator 32. When the set pressure is reached, the carbon dioxide injection valve 35B is closed.

Subsequently, the demineralized water D in which the carbon dioxide gas is dissolved flows into the mineral cartridge 36 . When passing through the mineral cartridge 36, calcium in the mineral agent in the mineral cartridge 36 is eluted as calcium bicarbonate in proportion to the carbonic acid concentration. Other mineral components are similarly dissolved as bicarbonates. In particular, by using uncalcined shell calcium, uncalcined coral calcium, or the like as a solid powdery mineral agent, not only calcium carbonate but also magnesium carbonate components are eluted, and mineral water containing these components can be obtained. can. Here, in the present embodiment, since the desalted water D in which carbon dioxide gas is dissolved is circulated, bicarbonate ions are present as counter ions of calcium and magnesium, resulting in less sulfate ions and chloride ions. can obtain delicious drinking water W. By passing through the mineral cartridge 36, the flow rate of the demineralized water D in which carbon dioxide gas is dissolved may be set so that the mineral water has a desired total hardness. However, if the total hardness of the mineral water exceeds 100, mineral components tend to precipitate, so the mineral cartridge 36 is filled so that the total hardness is about 100, 200 or less at most.

Finally, the obtained mineral water is passed through a mineral water supply pipe 37 through an activated carbon cartridge 38 equipped with an MF membrane to remove organic substances, miscellaneous taste components, and turbidity components contained in the mineral water. Delicious and clear drinking water W can be produced.

In the manufacturing process of the drinking water W as described above, the flow rate of the desalted water D is integrated by the flow meter 23A at regular time intervals, and the flow rate per hour is set. If the flow rate per hour falls below the set value, there is a possibility that the drinking water W or the like remains in the pipes of the device for a long time, and the taste quality is reduced due to the effluents caused by the pipes. , this is displayed as an alarm on the display 46, and the operator is urged to open the on-off valve 44 of the discharge pipe 43 and discard the water. When the water is discarded, the alarm on the display 46 is erased and the on-off valve 44 of the discharge pipe 43 is closed to make the drinking water W available, so that the delicious drinking water W can always be supplied. Furthermore, by managing the integrated flow rate of the flow meter 23A with the arithmetic device 45, it is also possible to manage the replacement timing of consumables such as the carbon dioxide cylinder 31, the mineral cartridge 36 and the activated carbon cartridge 38.

Next, a drinking water supply system for ships according to a second embodiment of the present invention will be described. The drinking water supply system for ships according to this embodiment basically has the same configuration as that of the above-described first embodiment, so the same reference numerals are given to the same configurations, and detailed description thereof will be omitted.

In FIG. 2, the drinking water supply system for ships of the second embodiment uses the seawater desalination device 2 as a vacuum distillation device. In this embodiment, the vacuum distillation apparatus 51 includes a vacuum distillation column 52, a desalted water supply line 53 connected to the vacuum distillation column 52, and a pressure regulating tank 54 disposed in the middle of the desalted water supply line 53. Prepare. Seawater S is supplied to the vacuum distillation column 52 of the vacuum distillation apparatus 51, and is separated by distillation at a pressure lower than the atmospheric pressure, thereby removing sodium chloride in the seawater S and minerals such as calcium and magnesium that determine the taste of water. The removed desalted water D is discharged to the desalted water supply line 53 . Thereafter, drinking water W can be produced in the same manner as in the first embodiment described above.

As described above, the seawater desalination device 2 is not limited to the reverse osmosis (RO) membrane desalination device 22, and the vacuum distillation device 51 can be similarly applied.

Although the drinking water supply system for ships according to the present invention has been described based on the above-described embodiments, the present invention is not limited to the above-described embodiments and can be modified in various ways. For example, the means for announcing the alarm is not limited to the display 46, but may be an alarm sound, or both may be used in combination. Also, the activated carbon cartridge 38 and the MF membrane may be provided separately. Furthermore, in the carbon dioxide dissolving apparatus, not only carbon dioxide but also other gas components may be mixed or supplied.

The following specific examples further illustrate the invention.

(mineral agent)
Uncalcined shell calcium was prepared as a mineral agent.

(Sensory test of drinking water for ships)
[Example 1, Reference Examples 1 to 5]
Using the apparatus shown in FIG. 2, 100 ppm of carbon dioxide gas was dissolved in desalted water D obtained by desalting seawater S using a carbon dioxide dissolving device to prepare desalted water D in which carbon dioxide gas was dissolved. This desalted water D in which carbon dioxide gas is dissolved is passed through a mineral cartridge 36 filled with a mineral agent under conditions in which about 100 ppm of the mineral agent is dissolved, and then through an activated carbon cartridge 38 to obtain the drinking water of Example 1. W was produced.

As reference examples, ultrapure water (reference example 1) and commercially available mineral water (reference examples 2 to 5) were prepared. In addition, Reference Example 2 is "Minami Alps Natural Water" (product name, Suntory), Reference Example 3 is "Irohasu Natural Water" (product name, Coca-Cola Japan Co., Ltd.), Reference Example 4 is "Volvic" (product name) Name, marketed by Kirin Beverage Co., Ltd.), and Reference Example 5 is "Evian" (trade name, Danone).

The drinking waters of Example 1 and Reference Examples 1 to 5 were tasted under conditions in which the nature of the drinking water was unknown, and a sensory test was conducted based on the taste. The results are shown in Table 1 together with the ingredients contained in each drinking water.

As is clear from Table 1, the drinking water W of Example 1, in which mineral components were dissolved after dissolving carbon dioxide gas, was more " It was very delicious." The taste was comparable to that of Reference Examples 2 to 5, which are typical mineral waters on the market.

1 Drinking water supply system for ships 2 Seawater desalination device 21 Supply line 22 Reverse osmosis (RO) membrane desalination device 23 Demineralized water supply line 23A Flow meter 24 Recovery channel 25 Discharge channel 26 Supply pump 27 On-off valve 28 On-off valve 3 Drinking water production device 31 Carbon dioxide cylinder (carbon dioxide dissolving device)
32 regulator 33 carbon dioxide supply line (carbon dioxide dissolving device)
34 Carbon dioxide reservoir 35A Carbon dioxide replenishment valve 35B Carbon dioxide injection valve 36 Mineral cartridge (mineral dissolving means)
37 Mineral water supply pipe 38 Activated carbon cartridge 39 Drinking water supply pipe 41 On-off valve 42 Boosting pump 43 Discharge pipe 44 On-off valve 45 Arithmetic device 46 Indicator 51 Vacuum distillation device 52 Vacuum distillation tower 53 Demineralized water supply line 54 Pressure regulation tank S Seawater D Demineralized water W Drinking water UP Point of use

Claims (3)

A drinking water supply system for ships comprising a seawater desalination device for producing desalinated water from seawater and a drinking water production device for producing drinking water from the desalinated water supplied from the seawater desalination device,
The drinking water production device comprises a carbon dioxide dissolving device, a mineral dissolving means and an activated carbon cartridge in this order,
further comprising a flow rate measuring means for measuring the supply amount of the desalted water supplied to the drinking water production apparatus and an arithmetic control unit;
The flow rate measuring means is connected to the arithmetic and control unit,
The arithmetic and control unit is connected to a display capable of displaying information including the integrated flow rate of the desalted water,
The arithmetic control device is capable of controlling the carbon dioxide dissolving device and the mineral dissolving device based on the supply amount of the demineralized water measured by the flow rate measuring device,
The arithmetic and control unit controls the concentration of carbon dioxide contained in the demineralized water to be supplied to the mineral dissolving means to be 100 to 500 ppm,
The flow rate measuring means integrates the flow rate of the desalted water at regular time intervals and sets the flow rate per hour as a set value,
When the desalinated water flow rate per hour falls below the set value, the arithmetic and control unit causes the display to display the information as an alarm, and warns the user to dispose of the produced drinking water as waste water. Drinking water supply system for ships. The flow rate measuring means is capable of transmitting a pulse signal to the arithmetic and control unit for each constant flow rate of the desalted water,
The arithmetic and control unit counts the integrated flow rate of the demineralized water based on the pulse signal received from the flow rate measuring means, and when the set integrated flow rate is reached, the demineralized water to be supplied to the mineral dissolving means. 2. The drinking water supply system for ships according to claim 1, wherein the injection of carbon dioxide gas into is initiated. 3. A marine potable water supply system according to claim 1 or 2, wherein the activated carbon cartridge comprises an MF membrane.

Images