KR20140073609A - The method for producing drinking water using deep sea water - Google Patents

The method for producing drinking water using deep sea water Download PDF

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KR20140073609A
KR20140073609A KR1020120134505A KR20120134505A KR20140073609A KR 20140073609 A KR20140073609 A KR 20140073609A KR 1020120134505 A KR1020120134505 A KR 1020120134505A KR 20120134505 A KR20120134505 A KR 20120134505A KR 20140073609 A KR20140073609 A KR 20140073609A
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water
concentrated
deep sea
seawater
deep
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KR1020120134505A
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Korean (ko)
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문정기
유윤기
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재단법인 포항산업과학연구원
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A20/00—Water conservation; Efficient water supply; Efficient water use
    • Y02A20/124—Water desalination
    • Y02A20/131—Reverse-osmosis

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Abstract

The prevent invention relates to a method for producing drinking water by using deep sea water. The method for producing drinking water by using deep sea water comprises: a pretreatment step for filtering deep sea water by using a filter; a first desalinization step for obtaining first desalinization water and enriched water by desalinizing the filtered deep sea water using a reverse osmosis membrane; a second desalinization step for obtaining second desalinization water from the first desalinization water by using a separation membrane for fresh water; a reenrichment step for obtaining highly enriched salt water, calcium sulfate, and sodium chloride by enriching the enriched water; and an input step for putting the highly enriched salt water and calcium sulfate into the second desalinization water. By the method of the present invention, drinking water which is alkalescent in pH, is safe from boron, and is tasty by containing rich minerals, is produced.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing drinking water using deep sea water,

The present invention relates to a method for producing drinking water using deep sea water. More particularly, it relates to a method for producing drinking water using deep sea water. More particularly, the present invention relates to a method for producing deep sea water, And to a method of producing potable water by adjusting it.

Deep sea water is deep sea water which is deeper than 200m depth from sea level. Unlike sea surface water, unlike sun water, plankton and life are not proliferated. Therefore, concentration of nutrients is high and density is different according to water temperature. There is no pollutant present in the surface seawater because it is not mixed with the surface seawater. Therefore, when compared with seawater in the surface layer, it has high stability at low temperature, is very clean due to pollutants, harmful bacteria and organic matter, is rich in mineral nutrients that are very important for plant growth, There are characteristics such as existing characteristics and aging characteristics aged for a long time under high-pressure low temperature condition.

In general, the method for producing drinking water from deep seawater includes a step of desalting by electrodialysis after pretreatment such as heating treatment, pretreatment filtration, and the like, followed by reverse osmosis to produce fresh water Korean Patent Publication No. 2011-0111340).

However, in the above-described method, the desalting treatment step by electrodialysis has a problem that the production cost of drinking water is increased due to high power consumption, and pH of drinking water produced in the case of reverse osmosis treatment is lowered. In particular, drinking water produced through the treatment of seawater separation membranes and membrane separation membranes has a pH of from 6.5 to 6.8, which is weakly acidic. In general, the weakly alkaline water is preferred as the pH of drinking water. The phenomenon is undesirable.

In addition, boron ions are present in the seawater at a level of about 4 to 5 mg / L. The removal rate of the boron ions is not as high as about 90% even by the reverse osmosis membrane. In order to replenish the minerals in the finally produced drinking water, It is more difficult to maintain the boron ion concentration in the drinking water below the reference concentration of 1.0 mg / L.

In addition, addition of other additives other than seawater is prohibited in the production process of drinking water using deep sea water. However, in the case of producing fresh water by the above-described method, generally, the addition of an alkaline agent . (Korean Patent Publication No. 2011-0111340, Korean Patent Publication No. 2010-0083638, Korean Patent Publication No. 2009-0128189)

Accordingly, it is an object of the present invention to provide a method for producing potable water having a weak alkaline pH, safe from boron, and rich in minerals by using only components of the deep sea water.

According to an embodiment of the present invention,

A pretreatment step of filtering the deep ocean water using a filter;

A first desalination step of desalting the deep seawater filtered in the pretreatment step using a reverse osmosis membrane for seawater to obtain concentrated water and primary desalted water;

 A second desalting step of obtaining secondary demineralized water from the primary demineralized water using a water-containing separation membrane, a re-concentration step of re-concentrating the concentrated water to obtain highly concentrated brine, calcium sulfate and sodium chloride; And

 And a step of introducing the highly concentrated brine and calcium sulfate into the secondary demineralized water.

The deep seawater may be taken at a water depth of 200 m or less based on the sea level.

The filter may be a microfilter or an ultrafilter.

The micro filter may have a pore size of 0.1 to 0.2 μm, and the ultrafilter may have a pore size of more than 0 and less than 0.1 μm.

The reverse osmosis membrane for seawater may be made of a polyamide material.

The baffle separation membrane may be made of a polyamide material.

In the re-concentration step, the concentrated water may be re-concentrated by sequentially passing the purified water through a secondary reverse osmosis membrane, a condenser, and a multi-effect evaporator.

The concentrated water may have a salt concentration of 9 to 10% by weight based on the total amount.

The concentrated brine may have a specific gravity of 1.28 to 1.32.

The highly concentrated brine can be added to the secondary demineralized water at a concentration of 100 to 200 mg / L on the basis of the total diameter.

The calcium sulfate may be added to the secondary demineralized water at a concentration of 50 to 100 mg / L on the basis of the total diameter.

The present invention relates to a process for producing drinking water using deep sea water, wherein the reverse osmosis membrane concentrated water is further concentrated and the byproducts generated in the crystallization process are added to demineralized water in an appropriate combination to obtain a weak alkaline pH and safe from boron, Thereby making it possible to produce abundant drinking water.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is an illustration of an exemplary process for making potable water using deep ocean water in accordance with the present invention.
FIG. 2 is a graph showing the results of analysis of a calcium sulfate component precipitated in a multi-effect evaporator in the manufacturing process of the present invention. FIG.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. However, the embodiments of the present invention can be modified into various other forms, and the scope of the present invention is not limited to the embodiments described below.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

According to an embodiment of the present invention, there is provided a method for treating a deep sea water, comprising the steps of: pretreating deep seawater using a filter; desalting the deep seawater filtered in the pretreatment step using a reverse osmosis membrane for seawater to obtain concentrated water and primary desalted water; A second desalting step of obtaining secondary demineralized water from the primary demineralized water by using a desalination membrane, a re-concentration step of re-concentrating the concentrated water to obtain highly concentrated brine, calcium sulfate and sodium chloride, And a step of introducing the deionized water into the deionized water.

The deep seawater used in the present invention is a deep seafloor deep sea water of depths of 200 m or more in depth based on the sea level. The pipeline is taken down to the depth of the seabed deeper than 200 m from the ship, or the siphon ) By the principle of.

Deep sea water is low in temperature and low in processing efficiency because it is lower in temperature than water which is the raw material of groundwater, rainwater and other drinking water.

The warming treatment can be carried out at 20 to 30 ° C. by receiving heat from the boiler. When the temperature is less than 20 ° C., it is difficult to smooth the subsequent treatment. When the temperature exceeds 30 ° C., There is a problem in terms of economy because it is necessary to take deep ocean water more than necessary amount.

In the pretreatment step of the present invention, microfiltration using a microfilter or ultrafiltration using an ultrafilter is performed, or filtration is performed in combination to remove suspended solids and microorganisms in the water.

At this time, it is preferable that the micro filter has a pore size of 0.2 m or less. When the pore size exceeds 0.2 탆, a large floating material present in the water may fall, but it may be difficult to remove a small floating material or a microorganism.

The ultrafilter preferably has a pore size of 0.1 mu m or less. If the pore size exceeds 0.1 탆, it may be difficult to remove microorganisms having a small size in water.

In the first desalination step of the present invention, the deep seawater filtered in the pretreatment step is passed through a SWRO (Sea Water Reverse Osmosis) to obtain primary desalted water and concentrated water. The primary dehumidifying water is desalinated in a range of 99.0 to 99.7% by weight in the deep seawater, and then is subjected to secondary desalting in a subsequent stage, and the concentrated water contains 5 to 6% by weight will be.

The reverse osmosis membrane for seawater used in the primary desalination step is preferably a membrane made of a polyamide material because it can withstand high osmotic pressure. In addition, the reverse osmosis membrane for seawater has a removal efficiency of at least 99% at a salt rejection rate of at least 99%. As the module type, a spiral wound type membrane having a high degree of integration of a membrane area can be used.

In the secondary desalting step of the present invention, the primary desalting water obtained in the primary desalting step may be desalted by passing through a BWRO (Brackish Water Reverse Osmosis) to obtain secondary desalting water. The secondary demineralized water is obtained by removing the salt in the deep seawater in the range of 99 wt% or more. In the case of primary desalination, the quality of demineralized water is generally inadequate because of the high concentration of ions used for drinking water, and it is common to purify it through secondary desalting and then add only necessary minerals.

It is preferable that the baffle separation membrane used in the secondary desalination step is selected from a polyamide type and a winding type.

The re-concentration step of the present invention is a step of re-concentrating the concentrated water obtained in the first desalination step, specifically, passing the concentrated water sequentially through a reverse osmosis membrane for secondary enrichment, a concentrator (condenser), and a multi- And can be performed in three steps.

It is preferable to select a membrane having a salt rejection rate somewhat lower than that of the reverse osmosis membrane for primary seawater in the secondary enrichment seawater reverse osmosis membrane. This is because the amount of concentrated water can be reduced rather than using desalted water, so that the amount of heat energy to be used for the subsequent concentration process can be reduced. In addition, it is possible to reduce the concentration of boron, which is a harmful component, partially.

The concentrated water obtained in the primary desalting step is secondarily concentrated while passing through the second-round seawater reverse osmosis membrane, and is further concentrated in the third stage in a concentrator (condenser) to produce calcium carbonate (CaCO 3 ) precipitate.

Thereafter, the third-concentrated concentrate is subjected to a fourth concentration step by evaporation in a multi-effusion evaporator to produce calcium sulfate (CaSO 4 ) and sodium chloride (NaCl) precipitate, and a concentrated brine having a specific gravity of 1.28 to 1.32 .

In the case of the concentrator and the evaporator for multiple use, it is preferable to select the evaporator considering the problems of efficient use of heat energy and generation of scales.

In the step of introducing the present invention, the calcium sulfate (CaSO 4 ) precipitate obtained in the re-concentration step and the concentrated salt water are introduced into the secondary demineralized water, and the secondary demineralized water obtained after the secondary desalting step is close to pure water, The precipitates and the concentrated salt water are added to the secondary demineralized water to provide drinking water having a mineral component and a pH suitable for drinking, because the necessary minerals are insufficient and have a low pH characteristic.

Concretely, the concentrated brine is added to the secondary demineralized water so as to have a level of 100 to 200 mg / L based on the total diameter of the drinking water, and calcium sulfate (CaSO 4 ) It is preferable to add it to deionized water. In this case, the general diameter is expressed by converting the amount of Ca 2 + and Mg 2 + in water into the concentration m (g / L) of calcium carbonate (CaCO 3 ) corresponding thereto.

When the high concentration brine is added at a level of less than 100 mg / L on the basis of the total diameter, the mineral component becomes relatively insufficient. When the concentration is higher than 200 mg / L, .

When the calcium sulfate (CaSO 4 ) precipitate is added at a level of less than 50 mg / L on the basis of the total diameter, there is a problem in adjusting the pH of the produced drinking water. When the concentration is higher than 100 mg / L, The water taste of the deep water may be deteriorated.

The drinking water produced by such a process is about 100 to 300 mg / L in total diameter, and the pH is maintained at about 7.2 to 7.5, which is weak alkalinity. In addition, in the case of boron, it can be safely controlled to 0.6 mg / L to 0.8 mg / L, which is the standard value of 1.0 mg / L or less. Further, various minerals present in the seawater due to the addition are also added, can do.

FIG. 1 schematically shows a process for producing drinking water using deep sea water according to the present invention. The deep sea water is collected by filtration of suspended matter and microorganisms using an ultrafilter, and is then subjected to a reverse osmosis membrane (SWRO) , The concentrated water and primary demineralized water can be obtained. Thereafter, the primary desalted water is desalted through the desorption membrane (BWRO) to obtain secondary desalted water. The concentrated water obtained in the primary desalination step was used as a second-round concentrated seawater reverse osmosis membrane (2 nd (SWSO), a condenser, and a multi-effect evaporator. The high-concentrated brine and calcium sulfate (CaSO 4 ) thus obtained are introduced into the secondary demineralized water to produce drinking water.

Example

Hereinafter, the present invention will be described more specifically by way of specific examples. The following examples are provided to aid understanding of the present invention, and the scope of the present invention is not limited thereto.

[Example 1]

Deep ocean water collected at 200m depth from sea level was stored in the raw water tank. Thereafter, a salt rejection rate of 99% or more was passed through a reverse osmosis membrane for seawater made of polyamide material to obtain concentrated water having a primary desalting water and a salt concentration of 5 to 6% by weight based on the total amount. Thereafter, water having almost no mineral component, which is the raw water of deep seawater, is formed through secondary desalting, and the concentrated water is subjected to a continuous additional concentration step to concentrate the specific gravity to a level of 1.28 to 1.32, and the precipitate generated in the concentration step is removed . In this process, minerals are supplemented through the secondary enrichment of the secondary demineralized water, and calcium carbonate in the precipitate is partially replenished to maintain the low boron concentration while adjusting the pH and balancing the dissolved ion concentration. At this time, the input ratio of calcium sulfate and highly concentrated brine to the secondary demineralized water was 2: 3.

Table 1 below shows changes in composition after the addition of calcium sulfate (CaSO 4 ) precipitate to the secondary demineralized water. After the addition of highly concentrated brine and calcium sulfate, the pH was increased to a slightly alkaline level, but the B concentration remained in the range of 1 mg / L or less.

Input (g) pH Cl SO 4 Ca Mg B 0 6.57 0.376 0.00 2.339 0.000 0.559 0.1 6.77 21.84 24.80 14.015 0.374 0.580 0.2 7.24 43.08 50.45 25.336 0.340 0.584 0.3 7.74 69.41 80.09 40.556 0.428 0.584 0.4 7.80 89.07 106.07 50.178 0.592 0.583 0.5 8.52 117.53 132.34 68.129 0.183 0.585

In addition, the pH of the drinking water produced by the present invention falls within the range of 6.8 to 7.2, which is the normal drinking water's pH, and it can be seen that the method of producing drinking water using the deep sea water of the present invention is suitable for drinking water production.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be obvious to those of ordinary skill in the art.

Claims (11)

A pretreatment step of filtering the deep ocean water using a filter;
A first desalination step of desalting the deep seawater filtered in the pretreatment step using a reverse osmosis membrane for seawater to obtain concentrated water and primary desalted water;
A secondary desalination step of obtaining secondary desalting water from the primary desalting water using a desalination membrane;
Concentrating the concentrated water to obtain highly concentrated brine, calcium sulfate and sodium chloride; And
And introducing the highly concentrated brine and calcium sulfate into the secondary demineralized water. The method of claim 1, wherein the deep seawater is taken at a depth of 200 m or less based on the sea level. The method of claim 1, wherein the filter is a microfilter or an ultrafilter. [4] The method of claim 3, wherein the micro filter has a pore size of 0.1 to 0.2 [mu] m, and the ultrafilter has a pore size of more than 0 and 0.1 [micro] m or less. [3] The method of claim 1, wherein the reverse osmosis membrane for seawater is deep sea water comprising polyamide. [2] The method of claim 1, wherein the desiccant separation membrane is made of polyamide based deep sea water. The method of claim 1, wherein the re-concentration step comprises re-concentrating the concentrated water by sequentially passing the concentrated water through a second reverse osmosis membrane for reverse osmosis, a condenser, and a multi- Way. The method for producing drinking water according to claim 1, wherein the concentrated water is a deep sea water having a salt concentration of 9 to 10% by weight based on the total amount. The method for producing drinking water according to claim 1, wherein the highly concentrated brine has a specific gravity of 1.28 to 1.32. [2] The method of claim 1, wherein the concentrated brine is introduced into the secondary demineralized water at a concentration of 100 to 200 mg / L on the basis of the total diameter. The method for preparing drinking water according to claim 1, wherein the calcium sulfate is added to the secondary demineralized water at a concentration of 50 to 100 mg / L on the basis of the total diameter.
KR1020120134505A 2012-11-26 2012-11-26 The method for producing drinking water using deep sea water KR20140073609A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016036010A1 (en) * 2014-09-05 2016-03-10 임운영 Seawater preprocessing device for seawater desalination and seawater preprocessing method
KR101648296B1 (en) * 2015-03-25 2016-08-12 현대제철 주식회사 Water treatment apparatus and water treatment method using the same
CN111410388A (en) * 2020-04-02 2020-07-14 天津鸿源环保科技有限公司 Oil sludge treatment process technology and complete equipment
CN112777832A (en) * 2021-01-12 2021-05-11 浙江海盐力源环保科技股份有限公司 Hot film coupling sea water desalination system with bidirectional feeding adjustment function

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016036010A1 (en) * 2014-09-05 2016-03-10 임운영 Seawater preprocessing device for seawater desalination and seawater preprocessing method
KR101648296B1 (en) * 2015-03-25 2016-08-12 현대제철 주식회사 Water treatment apparatus and water treatment method using the same
CN111410388A (en) * 2020-04-02 2020-07-14 天津鸿源环保科技有限公司 Oil sludge treatment process technology and complete equipment
CN112777832A (en) * 2021-01-12 2021-05-11 浙江海盐力源环保科技股份有限公司 Hot film coupling sea water desalination system with bidirectional feeding adjustment function
CN112777832B (en) * 2021-01-12 2023-07-04 浙江海盐力源环保科技股份有限公司 Hot film coupling sea water desalination system with feeding two-way regulation

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