KR100981423B1 - Method for Purifying Water - Google Patents

Abstract

The present invention relates to a water purification method capable of producing alkaline water containing minerals using liquid carbonic acid and mineral filter.

The present invention provides a raw water supplying step of preparing and supplying raw water, a reverse osmosis water purification step of purifying the raw water supplied by reverse osmosis and generating purified water, and a liquid carbonation step of injecting liquid carbonic acid into the purified water; An integer comprising a filtering step of filtering the purified water injected with the liquid carbonate with a carbonate mineral filter, a fine particle filtering step of filtering the fine particles included in the purified water filtered, and a water withdrawal step of collecting the purified water filtered Provide a method.

According to the water purification method of the present invention, the raw water may be purified with alkaline water containing minerals.

Carbonate, Carbonate Mineral Filter, Water Purification, Reverse Osmosis, Minerals, Alkaline Water

Description

Water Purification Method

The present invention relates to a water purification method, and more particularly, to a water purification method that can produce alkaline water containing minerals using liquid carbonic acid and mineral filter.

In general, in the case of seawater desalination facilities or large-scale water purification equipment and industrial water purification equipment, water is purified using reverse osmosis water purification equipment. Reverse osmosis water purification equipment is a method of filtering water to the pores of 0.001 ~ 0.0001㎛. However, the reverse osmosis water purification method removes not only foreign substances such as heavy metals in water but also beneficial minerals (mineral) to the body, and purified water has a problem of having an acidic pH of about 5.6. In recent years, as health awareness spreads rapidly, more and more consumers are looking for alkaline water containing minerals in domestic water purifiers as well as bottled water. Perception is not so good.

On the other hand, in countries with a large amount of lime in the water or in the Middle East where desalination facilities are needed, water is purified using reverse osmosis. In addition, in order to overcome the disadvantage of water without minerals, artificially undergoes reverse osmosis and then adds a mineral addition process, or puts a mineral preparation into the produced reverse osmosis purified water.

Here, the method of adding minerals to the reverse osmosis water purification equipment is mainly to balance the minerals using chemicals. At this time, the mainly used drugs include potassium chloride (KCl), magnesium chloride (MgCl ₂ ), calcium chloride (CaCl ₂ ), sodium carbonate (Na ₂ CO ₃ ), etc., by injecting the drugs in a flow rate compared to the mineral balance to reverse osmosis pressure The water passed through becomes mineral-water. However, the mineral water added with minerals as an artificial medicine as described above is not the taste of the water, is receiving the outside of the consumer for reasons such as not alkaline water. In addition, the method of putting the mineral preparation in the reverse osmosis purified water produced by the consumer has a inconvenience in having to buy a separate mineral preparation in the water.

An object of the present invention is to provide a water purification method that can produce alkaline water containing minerals using liquid carbonic acid and mineral filter.

It is also an object of the present invention to provide a water purification method capable of controlling the pH and TDS of water.

It is another object of the present invention to provide a water purification method capable of producing tasty water with an increased refreshing feeling.

The purified water purification method of the present invention devised to solve the above problems is to prepare raw water, and supplying raw water, and supplying raw water, and reverse osmosis water purification step of generating purified water by purifying the raw water supplied by reverse osmosis; A liquid carbonate injection step of injecting liquid carbonate into the purified water, a filtering step of filtering the purified water injected with the liquid carbonate with a carbonate mineral filter, and a fine particle filtration step of filtering the fine particles included in the purified water; , Withdrawal step of withdrawing the purified water to be filtered.

The liquid carbonate injection step is characterized in that for injecting the liquid carbonate at a flow rate of 2 to 25 kPa per liter of the purified water.

The liquid carbonate injection step is characterized by maintaining a pressure of 0.5 to 5.0 kgf / ㎠ until the purified water is injected into the carbonate mineral filter is injected. In addition, the liquid carbonate injection step is characterized in that to maintain the pH of the purified water to 4.0 to 5.6.

The carbonate mineral filter may be made of coral sand, and the carbonate mineral filter may include at least one selected from the group consisting of dolomite, magnesite, magnesium carbonate, calcium carbonate, shells, eggshells, and calcite which react with the coral sand and carbonic acid. It is characterized by being formed of a carbonate mineral containing a substance.

The filtering step is characterized in that the carbonate mineral of the carbonate mineral filter is dissolved in the purified water in which the liquid carbonate is dissolved to elute minerals in the range of TDS 10 to 300 ppm in the purified water, wherein the filtering step is the purified water pH 7.0 It is characterized by having an alkali of from 9.0 to 9.0.

Here, after the reverse osmosis water purification step may further include an underwater oxygen degassing step for degassing oxygen contained in the purified water and a cooling step for cooling the degassed water.

Another purified water purification method of the present invention devised to solve the above problems is to prepare raw water, and supplying raw water, and reverse osmosis water purification step of generating purified water by purifying the raw water supplied by reverse osmosis; A storage step of storing the purified water, a liquid carbonate injection and mixing step of injecting and mixing the liquid carbonate into the purified water, a filtering step of filtering the purified water mixed with the liquid carbonate with a carbonate mineral filter, and the filtered step It includes a fine particle filtration step of filtering the fine particles contained in the purified water, and the withdrawal step of taking the purified water filtered.

Here, after the reverse osmosis water purification step may further include an underwater oxygen degassing step for degassing oxygen contained in the purified water and a cooling step for cooling the degassed water.

Another water purification method of the present invention devised to solve the above problems is a raw water supply step of preparing and supplying raw water, a liquid carbonate injection step of injecting liquid carbonate into the raw water, and the liquid carbonate is injected A filtering step of filtering the raw water with a carbonate mineral filter, a fine particle filtration step of filtering the fine particles contained in the filtered raw water, and a withdrawal step of taking the filtered raw water.

Here, the raw water is characterized in that the tap water.

According to the water purification method of the present invention, the raw water may be purified with alkaline water containing minerals.

In addition, according to the water purification method of the present invention, it is possible to control the pH concentration and TDS of the raw water.

In addition, according to the water purification method of the present invention, an alkaline water having a pH of 7.0 to 9.0 and a mineral containing a TDS in the range of 10 to 300 ppm can be obtained.

In addition, according to the water purification method of the present invention it is possible to obtain a delicious water with an increased refreshing feeling.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

1 is a schematic diagram showing a water purification system according to a first embodiment of the present invention, Figure 2 is a flow chart showing the water purification method according to the first embodiment of the present invention in the order of process steps.

1 to 2, the water purification system 100 according to the first embodiment of the present invention includes a raw water supply unit 110, a reverse osmosis water purification unit 120, a degassing unit 130, and a cooling unit 140. And a liquid carbonate injection unit 150, a carbonate mineral filter unit 160, a filtration unit 170, and a water intake unit 180.

In addition, the water purification method according to the first embodiment of the present invention, the raw water supply step (S10), reverse osmosis water purification step (S20), underwater oxygen degassing step (S30), cooling step (S40), and liquid carbonation injection It comprises a step (S50), filtering step (S60), fine particle filtration step (S70) and water intake step (S80).

In the water purification method according to the first embodiment of the present invention, TDS is injected by injecting liquid carbonate into purified water purified by reverse osmosis, and dissolving the mineral by dissolving the carbonate mineral of the carbonate mineral filter. Containing minerals in the range of 10 to 300 ppm, it is possible to make alkaline water of pH 7.0 to 9.0, and also to produce tasteful water with increased cooling sensation.

The raw water supply unit 110 provides a place where the raw water supply step (S10) proceeds. The raw water supply step (S10) is a step of preparing the raw water to be purified, and supplying it to the reverse osmosis pressure purification unit 120. In this case, the raw water may be seawater or tap water generally used.

The reverse osmosis pressure constant unit 120 provides a place where the reverse osmosis pressure constant step (S20) proceeds. The reverse osmosis water purification step (S20) is a step of generating purified water by purifying the raw water supplied from the raw water supply unit 110 by a reverse osmosis method. Here, the reverse osmosis is briefly described. First, the osmotic pressure is a naturally occurring pressure generated when the solvent moves through the semipermeable membrane toward a higher concentration, and the reverse osmosis pressure is artificially applied to the solvent by interposing the semipermeable membrane. The pressure that can move to a lower concentration. At this time, the reverse osmosis pressure should be greater than the osmotic pressure, the way to purify the raw water in this way is the reverse osmosis water purification method. The purified water generated by the reverse osmosis pressure purification step (S20) in the reverse osmosis pressure constant part 120 is acidic in the range of pH 5.6 to pH 5.8, and becomes a state of 0 ppm of TDS (total dissolved solid). The TDS is used as a measure of, for example, a substance that is dissolved in water and passes through the filter paper when contaminated water is filtered through the filter paper. Therefore, the state of 0 ppm of TDS indicates that the contaminant is filtered out of the filter paper, and nothing is dissolved in the water passing through the filter paper. At this time, SS (suspended solid) is used as a measure of the suspended solids filtered by the filter paper.

The degassing unit 130 provides a place where the underwater oxygen degassing step (S30) proceeds. The oxygen degassing step (S30) is a step of removing oxygen (O ₂ ) contained in the purified water in order to maximize the dissolved concentration of carbon dioxide (CO ₂ ).

The cooling unit 140 provides a place where the cooling step (S40) proceeds. The cooling step S40 is a step of cooling the purified water from which oxygen has been removed. At this time, the temperature for cooling the purified water is maintained at 5 to 15 ℃, because the lower the temperature, the liquid carbonic acid is better dissolved.

The liquid carbonate injection unit 150 provides a place where the liquid carbonate injection step S50 is performed. The liquid carbonate injection step (S50) is a step of injecting liquid carbonate into the cooled purified water. In this case, the injected liquid carbonic acid may be supplied at a flow rate of 2 to 25 kPa per liter of the purified water. In addition, it is necessary to maintain a pressure of 0.5 to 5.0 kgf / cm 2 after injecting the liquid carbonic acid into the purified water before the filtering step S60 is performed in the carbonate mineral filter unit 160. The higher the pressure, the better the liquid carbonate dissolves in water. On the other hand, the lower the pressure, the lower the efficiency of dissolution of the liquid carbonate in water.

On the other hand, the liquid carbonic acid should be supplied to maintain the pH of the purified water to 4.0 to 5.6. If the carbon dioxide of the liquid carbonic acid is continuously dissolved in the purified water, the pH of the purified water is lowered due to an increase in hydrogen ions (H ⁺ ), and if the excessively added liquid carbonic acid, the pH of the purified water is lower than pH 4.0, Even if the purified water whose pH is excessively lowered passes through the carbonate mineral filter of the carbonate mineral filter 160, it is difficult to secure a pH indicating alkali and the TDS of the purified water also increases. In addition, setting the upper limit of the pH of the purified water to 5.6 indicates that the purified water produced by the reverse osmosis water purification step 120 in the reverse osmosis water purification step (S20) indicates a pH of 5.6 to 5.8. Since the pH of purified water becomes low as mentioned above, setting to pH 5.6 or more becomes meaningless.

The carbonate mineral filter 160 provides a place where the filtering step (S60) proceeds. The filtering step (S60) is a step of filtering the purified water with a carbonate mineral filter. The carbonate mineral filter may be formed of a carbonate mineral composed of dolomite, magnesite, magnesium carbonate, calcium carbonate, coral sand, shell, eggshell and calcite which react with carbonic acid. The purified water into which the liquid carbonate is injected dissolves the carbonate mineral to elute the mineral, and changes from weakly acidic to weakly alkaline water. At this time, the purified water has an alkalinity of pH 7.0 to 9.0, and contains minerals in the range of 10 to 300 ppm by TDS.

The filtration unit 170 provides a place where the fine particle filtration step (S70) proceeds. The fine particle filtration step (S70) is a step of filtering the fine particles, which are suspended in the purified water containing minerals and alkaline, using a filter in which pores smaller than the carbonate mineral filter are formed. In this case, the pores of the filter should be formed to be large enough to not filter the minerals and to have a size enough to filter the fine particles.

The water intake unit 180 provides a place where the water intake step S80 is performed. The withdrawal step (S80) is a step of taking in alkaline water containing minerals generated by the process steps (S10 to S70) as described above. After the withdrawal step S80, the water purification process according to the first embodiment of the present invention is completed.

On the other hand, Table 1 shows the pH and TDS change of the purified water according to the concentration of the liquid carbonate injected in the liquid carbonate injection step (S50) when the water purification process according to the first embodiment of the present invention.

Carbonic acid concentration Influent pH PH after carbonation PH after passing carbonate mineral filter TDS after passing through carbonate mineral Comparative Example 1 0㏄ / L 5.6 5.6 9.56 20 Example 1 5㏄ / L 5.6 5.51 8.89 28 Example 2 10㏄ / L 5.6 5.37 8.6 50 Example 3 15㏄ / L 5.6 5.20 8.2 68 Example 4 20㏄ / L 5.6 5.09 7.6 77 Example 5 25㏄ / L 5.6 4.98 7.1 101 Comparative Example 2 30㏄ / L 5.6 4.80 6.7 120 Comparative Example 3 35 ㏄ / L 5.6 4.69 6.5 150

Here, Comparative Examples 1 to 3 and Examples 1 to 5 of Table 1 were performed under the same pressure and temperature. At this time, the injection pressure of the liquid carbonic acid is 2.0 kgf / ㎠, the temperature of the purified water is 10 ℃, the pH of the influent is controlled to 5.6. In addition, the carbonate mineral filter is composed of a single coral sand.

Referring to Table 1, as in Examples 1 to 5, when the liquid carbonate injection amount is between 5 and 25 kPa per liter, it is possible to maintain a weak alkali of pH 7.10 to 8.89 after passing through the carbonate mineral filter, and TDS 28 to About 101ppm of mineral can be eluted. At this time, the contact time between the liquid carbonate dissolved in the purified water and the carbonate mineral filter has a close correlation with the pH change of the purified water. That is, when the contact time of the purified water passes through the carbonate mineral filter becomes long, even if the purified water contains a large amount of liquid carbonic acid, it becomes alkaline eventually. Therefore, the TDS range can increase the contact time between the carbonate mineral filter and the purified water in which the liquid carbonate is dissolved, and can be widened to 300 ppm TDS by increasing the concentration of the liquid carbonate.

On the other hand, as in Comparative Example 1, if the liquid carbonic acid is not injected into the purified water, the purified water elutes a small amount of TDS 20ppm while passing through the carbonate mineral filter, the purified water has a strong alkalinity of pH 9.56.

In addition, as in Comparative Examples 2 to 3, when the liquid carbonic acid is over-injected into the purified water at about 30 to 35 kPa per liter, the purified water elutes about 120 to 150 ppm of TDS while passing through the carbonate mineral filter. It has a weak acidity of pH 6.5 to 6.7.

Next, a water purification method according to a second embodiment of the present invention will be described.

Figure 3 is a schematic diagram showing a water purification system according to a second embodiment of the present invention, Figure 4 is a flow chart showing the water purification method according to a second embodiment of the present invention in the order of process steps.

The water purification method according to the second embodiment of the present invention is a storage step of storing the purified water as compared to the water purification method according to the first embodiment of the present invention, and a liquid carbonate injection and mixing step of mixing the purified water and the liquid carbonate injected Since only has the same components as the water purification method according to the first embodiment of the present invention, the same reference numerals are assigned to the same components, and duplicate descriptions will be omitted. Accordingly, in the second embodiment of the present invention will be described with respect to the storage step and the liquid carbonate injection and mixing step that is different from the first embodiment of the present invention.

3 to 4, the water purification system 200 according to the second embodiment of the present invention includes a raw water supply unit 110, a reverse osmosis water purification unit 120, a degassing unit 130, and a cooling unit 140. And a storage unit 210, a liquid carbonate injection unit 150, a carbonate mineral filter unit 160, a filtration unit 170, and a water intake unit 180.

In addition, the water purification method according to the second embodiment of the present invention is the raw water supply step (S100), reverse osmosis pressure purification step (S200), underwater oxygen degassing step (S300), cooling step (S400), storage step ( S500), the liquid carbonate injection and mixing step (S600), filtering step (S700), fine particle filtration step (S800) and water intake step (S900) is made.

The raw water supply unit 110, the reverse osmosis pressure purification unit 120, the degassing unit 130 and the cooling unit 140, respectively, the raw water supply step (S100), reverse osmosis pressure purification step (S200), and oxygen degassing step The purified water passing through the step S300 and the cooling step S400 is introduced into the storage unit 210.

The storage unit 210 provides a place where the storage step (S500) proceeds, and at the same time the liquid carbonate is injected from the liquid carbonate injection unit 150, the liquid carbonate injection and mixing is mixed with the liquid carbonate and the purified water It provides a place where step S600 proceeds. That is, the storage unit 210 and the storage step (S500) serves to provide a stable space in which the liquid carbonic acid and purified water can react uniformly and sufficiently.

The purified water reacted sufficiently in the storage unit 210 is the carbonate mineral filter unit 160, the filtering unit 170 and the intake unit 180, respectively, filtering step (S700), fine particle filtration step (S800) and water intake step After (S900) it is produced as alkaline water containing minerals.

That is, compared with the first embodiment of the present invention, the liquid carbonate injection and mixing step (S600) made in the storage step (S500) and the storage unit 210 according to the second embodiment of the present invention is the pH of the purified water Can be kept more appropriate and stable.

Next, a water purification method according to a third embodiment of the present invention will be described.

5 is a flowchart showing a water purification method according to a third embodiment of the present invention in the order of process steps.

The water purification method according to the third embodiment of the present invention is different from the water purification method according to the first embodiment of the present invention, except that the reverse osmosis water purification step for purifying raw water by reverse osmosis is omitted. In the third embodiment, description will be focused on portions having a difference from the first embodiment of the present invention.

5, the water purification method according to the third embodiment of the present invention is the raw water supply step (S1000), the oxygen degassing step (S2000), the cooling step (S3000), the liquid carbonation step (S4000) and It comprises a filtering step (S5000), fine particle filtration step (S6000) and water intake step (S7000).

Here, the water purification method according to the third embodiment of the present invention provides a water purification method in which the reverse osmosis pressure constant step (S20) is omitted from the water purification method according to the first embodiment of the present invention. In the water purification method according to the first embodiment of the present invention, it is possible to control the pH concentration and TDS of purified water purified by reverse osmosis. At this time, according to the first embodiment of the present invention, the pH concentration and the TDS control are closely related to the injection amount of the liquid carbonate and the contact time of the liquid carbonate and the carbonate mineral filter. As a result, the pH and TDS of the tap water having a generally alkaline pH of about 7.5 according to the third embodiment of the present invention is also supplied to the raw water supply step (S1000), oxygen degassing step (S2000), and cooling step. (S3000), the liquid carbonate injection step (S4000), the filtering step (S5000), the fine particle filtration step (S6000) and the water intake step (S7000) means that you can control how much. Therefore, the water purification method according to the present invention is not necessarily limited to the purified water by the reverse osmosis method used to prepare the delicious water through the pH and TDS control.

As described above in the first to third embodiments of the present invention, according to the water purification system of the present invention and the water purification method using the same, raw water may be purified by alkaline water containing minerals.

In addition, according to the water purification system of the present invention and the water purification method using the same, it is possible to control the pH concentration and TDS of raw water, have an alkalinity of pH 7.0 to 9.0, and obtain a purified water containing minerals in the range of TDS 10 to 300 ppm. .

In addition, according to the water purification system of the present invention and the water purification method using the same, it is possible to obtain delicious water with an increased refreshing feeling.

As described above, the present invention is not limited to the above-described specific preferred embodiments, and any person having ordinary skill in the art to which the present invention belongs without departing from the gist of the present invention claimed in the claims. Various modifications are possible, of course, such changes are within the scope of the claims.

1 is a schematic diagram schematically showing a water purification system according to a first embodiment of the present invention.

2 is a flow chart showing the water purification method according to the first embodiment of the present invention in the order of process steps.

3 is a schematic diagram schematically showing a water purification system according to a second embodiment of the present invention.

4 is a flow chart showing the water purification method according to the second embodiment of the present invention in the order of process steps.

5 is a flowchart showing a water purification method according to a third embodiment of the present invention in the order of process steps.

<Explanation of symbols for the main parts of the drawings>

100, 200: water purification system 110: raw water supply

120: reverse osmosis constant 130: degassing unit

140: cooling unit 150: liquid carbon injection unit

160: carbonate mineral filter 170: filtration unit

180: water intake 210: storage

Claims (13)

A raw water supply step of preparing and supplying raw water; A reverse osmosis water purification step of purifying the raw water supplied by a reverse osmosis method to generate purified water; An underwater oxygen degassing step of degassing oxygen contained in the purified water; A cooling step of cooling the purified water degassed; A liquid carbonate injection step of injecting liquid carbonate into the purified water; A filtering step of filtering the purified water injected with the liquid carbonate with a carbonate mineral filter; A fine particle filtration step of filtering the fine particles included in the purified water; And Intake step of taking the purified water filtered; Water purification method comprising a. The method of claim 1, The liquid carbonate injection step is characterized in that the liquid carbonate is injected at a flow rate of 2 to 25 kPa per liter of the purified water. The method of claim 1, The liquid carbonate injection step is characterized in that for maintaining the pressure of 0.5 to 5.0 kgf / ㎠ until the purified water is injected into the carbonate mineral filter is injected. The method of claim 1, The liquid carbonate injection step is a water purification method, characterized in that to maintain the pH of the purified water to 4.0 to 5.6. The method of claim 1, The carbonate mineral filter is a water purification method, characterized in that consisting of coral sand. The method of claim 5, The carbonate mineral filter is an integer characterized in that it is formed of a carbonate mineral containing at least one material selected from the group consisting of dolomite, magnesite, magnesium carbonate, calcium carbonate, shell, eggshell and calcite react with the coral sand and carbonic acid Way. The method of claim 1, The filtering step is characterized in that the carbonate mineral of the carbonate mineral filter is dissolved in the purified water in which the liquid carbonate is dissolved to elute minerals in the range of TDS 10 to 300ppm in the purified water. The method of claim 1, The filtering step is characterized in that the purified water has an alkaline pH of 7.0 to 9.0. delete A raw water supply step of preparing and supplying raw water; A reverse osmosis water purification step of purifying the raw water supplied by a reverse osmosis method to generate purified water; An underwater oxygen degassing step of degassing oxygen contained in the purified water; A cooling step of cooling the purified water degassed; A storage step of storing the integer; Liquid carbonate injection and mixing step of injecting and mixing the liquid carbonate into the purified water; A filtering step of filtering the purified water mixed with the liquid carbonate with a carbonate mineral filter; A fine particle filtration step of filtering the fine particles included in the purified water; And Intake step of taking the purified water filtered; Water purification method comprising a. delete A raw water supply step of preparing and supplying raw water; An underwater oxygen degassing step of degassing oxygen contained in the raw water; A cooling step of cooling the raw water degassed; A liquid carbonate injection step of injecting liquid carbonate into the raw water; A filtering step of filtering the raw water into which the liquid carbonate is injected by a carbonate mineral filter; A fine particle filtration step of filtering the fine particles contained in the raw water to be filtered; And Intake step of taking in the raw water to be filtered; Water purification method comprising a. 13. The method of claim 12, The raw water is purified water, characterized in that the tap water.

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