JP3634237B2 - Drinking water - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to drinking water using deep ocean water.
[0002]
[Prior art]
It is well known that when a reverse osmosis membrane module such as a hollow fiber type is used, a large amount of raw seawater can be desalinated. Examples thereof can be found in JP-A-7-275671, JP-A-10-296058, JP-B 63-44017, and the like.
[0003]
Currently, deep sea water is being taken in Toyama Bay in Toyama Prefecture and Cape Muroto in Kochi Prefecture. This deep ocean water sinks off the coast of Norway and sinks into the ocean floor to form a deep ocean current, slips due to the rotation of the earth, travels from the Atlantic Ocean to the southern tip of Africa, then travels south of Australia to the Pacific Ocean. However, it is said that some of them will flow to the vicinity of Japan through the Trench after thousands of years. The deep ocean water in the present invention has three major characteristics of eutrophication, low water temperature, and cleanliness, and is defined as one in which photosynthesis does not proceed because it is in the deep sea where sunlight does not reach. Taking food and drink as an example of such deep sea water, there are many sake, tofu, konjac, and the like. The present applicant also manufactures and sells drinking water in which Muroto deep sea water is desalinated.
[0004]
According to a research announcement by a public institution, 84 types of mineral minerals remain in the deep ocean waters mentioned above. For example, deep ocean waters are effective for atopic dermatitis at a rate of over 60%. It has been reported that. On the other hand, the above-mentioned food and drink also contributes to the improvement of taste, and its usefulness as a so-called health food is taken up. It is also currently used in cosmetics. However, it is not always clear at this time why the effect of each product is due to.
[0005]
Originally generated fresh water from seawater is not suitable for use as drinking water. It is empirically known that there is a taste problem and it is unfavorable for health. Therefore, for example, in Japanese Patent Publication No. 4-72597, high-quality drinking water is obtained by performing a post-treatment in which the generated fresh water of seawater absorbs carbon dioxide.
[0006]
[Problems to be solved by the invention]
The present applicant has manufactured and sold drinking water obtained by desalinating Muroto deep sea water. It has been recognized as an effective health drink for diabetes and arty dermatitis. However, according to the knowledge of the present inventor, if the raw seawater is almost completely desalinated, it is not possible to obtain good-quality drinking water with good taste, and deeply deep seawater, which is sufficiently effective. I knew I couldn't.
[0007]
In this regard, Japanese Patent Application Laid-Open No. 10-225683 proposes focusing on the cleanliness of deep ocean water and desalinating it with a reverse osmosis membrane module using raw seawater to simplify the pretreatment equipment for filtration. It is disclosed. However, according to the experience of the present inventor, it is indispensable to clean the reverse osmosis membrane module even in the deep ocean water having cleanliness. It deteriorates and the electric conductivity of the produced fresh water becomes too high with time, and if it is left as it is, the “brushing” is too strong and it becomes unsuitable for drinking water. For example, in a new reverse osmosis membrane module, the initial electrical conductivity of desalted permeated water is 80 to 100 microsiemens / cm (hereinafter referred to as μS / cm). / Cm, which is regarded as deterioration. On the other hand, in the new reverse osmosis membrane module, as already seen, the produced fresh water is close to pure water and tastes badly and cannot be used as it is as drinking water.
[0008]
Based on these experiences, the present inventor has completed the present invention as a result of experimentally examining the optimum electrical conductivity as drinking water while effectively utilizing the characteristics of deep ocean water. That is, an object of the present invention is to obtain a delicious and high-quality drinking water while retaining the advantages of deep ocean water.
[0009]
[Means for Solving the Problems]
The drinking water according to the present invention is characterized in that the deep sea water is desalted and the electrical conductivity is set to 190 to 250 μS / cm. The electrical conductivity here is preferably set to 210 to 230 μS / cm.
[0010]
In the drinking water according to the present invention, the electrical conductivity is set to 190 to 250 μS / cm by adding the deep sea water to the desalted permeated water obtained by desalinating the deep sea water which is the raw sea water by the reverse osmosis method. It is characterized by doing . In this case, the electrical conductivity is preferably set to 210 to 230 μS / cm. Here, the deep sea water which is added to the demineralized permeate is original sea water this.
[0011]
[Action]
A hollow fiber type, a spiral type, a tubular type, etc. can be widely applied as a reverse osmosis membrane module when desalting the deep sea water of the raw seawater by the reverse osmosis method. The electrical conductivity of theoretical pure water is an insulator of about 0.055 μS / cm. Therefore, electrical conductivity is a measure for knowing the amount of electrolyte in water. General tap water is 250 to 66.67 μS / cm. In the present invention, it means that the electrolyte corresponding to the electrical conductivity is an active ingredient of raw seawater, that is, deep sea water.
[0012]
The reason why the electrical conductivity of the drinking water according to the present invention is set to 190 μS / cm or more is that if it is less than this, it becomes close to pure water as described above, and taste is worse, and in this case, 210 μS / cm. It is preferable to make it above. Moreover, the reason why the electrical conductivity of the drinking water according to the present invention is set to 250 μS / cm or less is that if this is exceeded, the “brushing” becomes too strong, and in this case, the electric conductivity should be 230 μS / cm or less. preferable.
[0013]
【The invention's effect】
According to the drinking water of the present invention, a delicious and high-quality drinking water is obtained, and an effective electrolyte for deep sea water corresponding to the electrical conductivity is contained. Further, in the present invention, after the deep sea water of the raw seawater is once desalinated by the reverse osmosis method, the drinking water obtained by adding the deep sea water to the desalted permeated water, in addition to the above effects, the desired It is easy to set the electrical conductivity, i.e., 190 to 250 [mu] S / cm, more preferably 210 to 230 [mu] S / cm.
[0014]
【Example】
FIG. 1 conceptually shows the entire seawater desalination apparatus for obtaining drinking water according to the present invention. Reference numeral 1 denotes a main head including a hollow fiber type reverse osmosis membrane module. 2 is a slave head similarly equipped with a hollow fiber type reverse osmosis membrane module. The main head 1 has a large processing capacity (40 tons / day), and the slave head 2 has a small processing capacity (10 tons / day). The main head 1 includes a first mixing device 3, and the slave head 2 includes an intermediate mixing device 5 and a second mixing device 6, which are connected in communication as follows.
[0015]
The raw seawater undergoes a pretreatment such as filtration, and is then fed to the main head 1 via the raw water channel 7 by a suction pump built in the main head 1. Muroto deep sea water taken from Cape Muroto, Kochi Prefecture was used as the raw seawater. From the middle of the raw water channel 7, a raw water branch channel 9 is led out via a valve 8, and the leading end of the raw water branch channel 9 is connected to the first mixing device 3.
[0016]
The main head 1 and the first mixing device 3 are connected to each other through a first permeate channel 10. The first permeate that has been desalinated by the reverse osmosis method in the main head 1 is guided to the first mixing device 3 via the first permeate channel 10. The first mixing device 3 is provided with a first extraction path 11 for taking out the first treated water produced by mixing here. The concentrated drainage discharged from the main head 1 is discharged to the outside through the discharge path 12.
[0017]
A permeate branch passage 14 is led out from the middle portion of the first permeate passage 10 through a switching valve 13, and a lead-out end of the permeate branch passage 14 is branched and connected to the slave head 2 and the intermediate mixing device 5. ing.
[0018]
The slave head 2 and the intermediate mixing device 5 are connected in communication by the second permeate channel 15. The second permeated water desalinated by the sub head 2 by the reverse osmosis method is taken out from the sub head 2 and guided to the intermediate mixing device 5 through the second permeate channel 15.
[0019]
The intermediate mixing device 5 and the second mixing device 6 are connected to each other through a mixed water supply path 16. The slave head 2 is provided with a discharge passage 17 for discharging concentrated waste water to the outside, and the discharge passage 17 and the second mixing device 6 are connected in communication with each other through a waste water supply passage 19.
[0020]
The second mixing device 6 is provided with a second extraction path 20 for taking out the second treated water generated by the mixing treatment here. The drainage channel 17 and the raw water channel 7 are connected to each other through a circulation channel 21. In the raw water channel 7, one end of the circulation channel 21 is connected to the upstream side of the raw seawater supply direction from the branch point of the raw water branch channel 9.
[0021]
When the reverse osmosis membrane module of the main head 1 is new, the main head 1 is operated and the operation of the sub head 2 is stopped. The raw sea water from the raw water channel 7 is supplied to the main head 1 and a part thereof is also supplied to the first mixing device 3 through a raw water branch channel 9 by a pump (not shown). The raw sea water in the raw water channel 7 does not flow into the circulation channel 21 by the backflow prevention valve 22. The first permeated water desalinated by the main head 1 is supplied to the first mixing device 3 through the first permeated water channel 10. At this time, the switching valve 13 operates and the first permeate does not flow into the permeate branch 14.
[0022]
In the first mixing device 3, a part of the raw seawater from the raw water branch 9 and the first permeated water coming from the main head 1 through the first permeated water channel 10 are mixed at a predetermined ratio while the first mixing device 3 is mixed. 3, first treated water having an electric conductivity of about 200 μS / cm is generated, and this first treated water is taken out to the storage tank 23 via the first take-out path 11. It should be noted here that the raw seawater is partly mixed in the first treated water.
[0023]
The first mixing device 3 includes a conductivity meter 25, and flow rate adjusting valves 26 and 27 are respectively provided in the raw water branch 9 and the first permeate water channel 10 immediately before entering the first mixing device 3. Yes. Thereby, the electrical conductivity of the mixed water in the first mixing device 3 is detected by the conductivity meter 25, and the inflow amount of the raw seawater from the raw water branch 9 is adjusted with respect to the flow rate of the first permeated water, The electric conductivity of the first treated water generated by the first mixing device 3 is adjusted to about 200 μS / cm which is equal to or less than a reference value (210 to 230 μS / cm). The electrical conductivity here does not need to be strictly adjusted. Therefore, the flow rate of the first permeate is kept constant, the valve 27 is omitted, and only the flow rate of the raw water branch 9 is adjusted by the opening / closing amount of the valve 8 or the valve 26, so It is sufficient to set the conductivity to 150 to 200 μS / cm. When the electrical conductivity of the first permeated water is maintained at about 200 μS / cm with a conductivity meter attached to the main head 1, the intake of the raw seawater into the first mixing device 3 is stopped. I can leave.
[0024]
When the reverse osmosis membrane module of the main head 1 is deteriorated, that is, when the electric conductivity of the first permeate from the main head 1 exceeds 200 μS / cm, for example, the sub head 2 is operated together with the main head 1. At this time, the valve 8 is closed to stop the raw seawater from flowing into the first mixing device 3 and the switching valve 13 is switched so that the first permeate flows from the first permeate channel 10 to the permeate branch 14. The flow into the first mixing device 3 is blocked. However, the concentrated drainage discharged from the slave head 2 is sent to the main head 1 together with the raw seawater from the raw waterway 7 via the drainage channel 17 and the circulation channel 21.
[0025]
Thus, the first permeated water from the main head 1 is distributed and supplied to the slave head 2 and the intermediate mixing device 5 through the first permeated water channel 10 and the permeated water branch channel 14. The slave head 2 is also provided with a suction pump. The sub head 2 desalinates the first permeate to compensate for the lack of function of the main head 1, and the second permeate discharged from the sub head 2 is mixed with the untreated first permeate in the intermediate mixing device 5 at a predetermined ratio. Mixed. The mixed water mixed by the intermediate mixing device 5 responds flexibly to, for example, about 150 μS / cm regardless of whether the reverse osmosis membrane modules of the main head 1 and the sub head 2 are old or new, and the mixed water. Is fed into the second mixing device 6 through the mixed water supply path 16. A part of the concentrated drainage discharged from the slave head 2 through the drainage channel 17 is sent to the second mixing device 6, and this is added to the mixed water from the intermediate mixing device 5 and mixed.
[0026]
The second mixing device 6 includes a conductivity meter 30, and flow rate adjusting valves 31 and 32 are respectively provided in the mixed water supply passage 16 and the drainage supply passage 19 immediately before entering the second mixing device 6. Yes. Thereby, the electrical conductivity of the mixed water in the second mixing device 6 is detected by the conductivity meter 30, and the inflow amount of the concentrated waste water from the waste water supply path 19 is adjusted with respect to the flow rate of the mixed water. The electric conductivity of the second treated water generated by the mixing device 6 is adjusted to about 200 μS / cm, which is a reference value (210 to 230 μS / cm) or less. The electrical conductivity here does not need to be strictly adjusted. Accordingly, the inflow amount of the mixed water from the mixed water supply path 16 is made constant, the valve 31 is omitted, and only the inflow amount from the drainage supply path 19 is adjusted by the opening / closing amount of the valve 32. 150 to 200 μS / cm is sufficient.
[0027]
From the second mixing device 6, the second treated water that has been generated and processed to have an electric conductivity of about 200 μS / cm is taken out to the storage tank 23 via the second take-out path 20. A concentrated drainage extraction path 33 is led out from the discharge path 17 of the slave head 2, and the concentrated drainage that has passed through the extraction path 33 can be taken into the storage tank 23. In the storage tank 23, the first treated water from the first mixing device 3, although not shown mixed raw sea water, eventually electrically conducting the first treated water and the second treated water in here Strictly adjust the rate to about 220 μS / cm to make it a drinking water.
[0028]
That is, in order to finally set the generated treated water in the storage tank 23 to an electric conductivity of about 220 μS / cm, the storage tank 23 includes a conductivity meter 35 . This ensures, stirring mixing generation process water in the storage tank 23, detects the electrical conductivity conductivity meter 35, about the electric conductivity of the generation process water tank 23 based on the detection signal It is controlled to be 220 μS / cm . Similarly performed when that savings distillation about 220μS / cm electrical conductivity of the first treated water in the tank 23.
[0029]
In the above embodiment, the conductivity meters 25 and 30 attached to the first mixing device 3 and the second mixing device 6 need to adjust the opening and closing amounts of the valves 26 and 27 and 31 and 32, respectively. It may be used for simple visual confirmation .
[0030]
The generated treated water in the storage tank 23 thus obtained is put in a container as it is and used for drinking water. When accordingly, the drinking water in desalination permeate deep seawater, since the original seawater deep seawater is mixed, with the characteristics of the deep sea water, and the electrical conductivity of about 220μS / cm By setting, a delicious and good quality product was obtained. In addition, it is advantageous for taking in the active ingredient of deep sea water to use the concentrated waste water from the subhead 2 without discharging | emitting outside through the circulation path 21, and adding it to 2nd treated water. It was proved empirically.
[0031]
When the electrical conductivity of the first permeated water from the main head 1 reaches about 220 μS / cm, the sub head 2 may be operated so that the first permeated water is switched to the permeated water branching path 14 .
[0032]
The intermediate mixing device 5 is effective to flexibly cope with the deterioration degree of the reverse osmosis membrane module between the main head 1 and the sub head 2, but the intermediate mixing device 5 may be omitted. In this case, the slave head 2 and the second mixing device 6 may be directly connected by the second permeate channel 15, and the second permeate from the slave head 2 and the concentrated waste water may be mixed in the second mixer 6.
[Brief description of the drawings]
FIG. 1 is a schematic explanatory diagram showing an example of a seawater desalination apparatus according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Main head 2 Subhead 3 1st mixing apparatus 5 Intermediate mixing apparatus 6 2nd mixing apparatus 7 Raw water path 9 Raw water branch path 10 First permeate water path 11 First extraction path 12 Main head discharge path 13 Switching valve 14 Permeate water branch path 15 Second permeate water channel 16 Mixed water supply channel 17 Drainage channel 19 of subordinate head Drain supply channel 20 Second extraction channel 21 Circulation channel 23 Storage tank 25 Conductivity meter 30 Conductivity meter 33 Concentration drainage discharge channel 35 Conductivity meter 36 Flow rate Adjustment valve

Claims (2)

By adding the raw seawater to the desalted permeated water whose electrical conductivity is below the standard value obtained by desalting the deep seawater, which is the raw seawater, using the reverse osmosis method, the electrical conductivity is reduced to the standard value. Drinking water characterized by being set to 190 to 250 μS / cm. The drinking water according to claim 1 , wherein the reference value of electrical conductivity is set to 210 to 230 μS / cm .

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