KR102098228B1 - Automatic control system of hardness of production water - Google Patents

Abstract

The present invention relates to a system for automatically controlling the hardness of production water using groundwater, a first transfer by a first pump (40) from a control unit, a control unit (10), a raw water storage unit (20), and the raw water storage unit (20). A first filter 50 for filtering raw water transferred through the furnace P1 and branching it into treated water and concentrated water, and a production water storage unit 100 for receiving and storing the treated water through a second transfer path P2 ), A concentrated water storage unit 120 for receiving and storing the concentrated water through a third transport path (P3) and a fourth transport path (P4) branched from the third transport path (P3), electricity It is characterized in that the conductivity is measured in real time, and according to the measured electrical conductivity, the first valve and the second valve are automatically controlled to produce production water.

Description

Automatic control system of hardness of production water}

The present invention relates to a system for automatically controlling the hardness of production water using groundwater and a method for manufacturing production water, in detail, electrical conductivity of primary treated water in which desired hardness is preset and impurities contained in raw water are filtered. To measure the electrical conductivity of the production water in real time and then automatically control the mixing of the treated water and the concentrated water to meet the final required hardness, the hardness automatic control system that supplies the production water of the desired hardness and the manufacturing method of the production water. It is about.

In general, when consumers ask for an evaluation on the taste of water, most of them respond that they do not feel the difference, but due to the chemical characteristics, there is a difference in taste. Water affects the taste according to the nature of the collected raw resin. Recently, as more and more consumers think that good water influences the taste of alcohol, marketing competition among companies trying to improve product image is becoming more intense through the fact that good water is used. The main source of water used by companies is groundwater. During the process of rainwater penetration into the basement, it passes through the porous lava layer and acts as a self-cleaning agent, solubilizes the minerals of the lava layer to form components of groundwater, which have chemical characteristics that contain relatively large amounts of vanadium and silicon components. have.

In groundwater or surface water, the climate, soil, and natural conditions of the area are reflected in the components of the water, so that the long-term rainwater journey contains mineral components in the water, and it is used as a source of drinking water by using a water source containing these components and affects the taste. Is given.

In addition, in the case of water, the mouth feels differently depending on the amount of minerals contained in the water, that is, Total Dissolved Solids (TDS) or hardness. In water with a high TDS content (or hardness), it has a heavy taste, and in a water with a low TDS content, a relatively soft taste is stimulated.

Depending on the nature of the source, the taste of the final product, liquor or beverage product is different, and the taste of the consumer is also different. Therefore, it is becoming the competitiveness of related companies to supply production water of the hardness desired by the target consumer of the product.

For example, Otoko-zake in Nada, Hyogo Prefecture, was cast as hard water containing a large amount of mineral components and sold as a representative sake product. Accordingly, artificial water was artificially converted to hard water in other regions to develop similar sake products, whereas Hiroshima Sake And Niigata's Koshino Ganpai have developed Miura soft water brewing methods using local calcium-low water softeners, and are developing products that have a good taste and rich flavor (Eric Teillet et al., Food Quality and Preference, 21 (2010), 967- 976).

Europe, including Germany, is made up of limestone, and its ingredients dissolve in water, and hard water accounts for most of it. Pilsner beer followed the method of making brown beer in Munich by using super soft water in the Pilsen region of the Czech Republic, but it was decided that different types of water were decided, and as a result, a beer with a golden golden taste was developed.

JP 2011-164360 A

In the automatic control system for the hardness of the production water using groundwater and the production method of the production water, domestically, minerals useful for the human body are made from ultra-pure water using ion exchange resin treatment and reverse osmosis using raw water of good mineral components as raw water The ingredients are removed or, if necessary, mineral ingredients are artificially administered, so that the characteristics of the existing raw water cannot be utilized, and production water of hardness that meets the consumer's preference cannot be used as a raw material.

Therefore, the present invention is to solve a number of problems, including the above problems, the desired hardness is set in advance and the electrical conductivity of the treated water is automatically measured while manufacturing the production water using raw water. It is an object of the present invention to provide an automatic hardness control system for automatically controlling the mixing of treated water and concentrated water, and a method for producing production water.

However, these problems are exemplary, and the scope of the present invention is not limited thereby.

According to an aspect of the present invention for solving the above problems, the raw water storage unit; A first filter for filtering raw water transferred through the first transfer path by the first pump from the raw water storage unit and branching it into treated water and concentrated water; A production water storage unit that receives and stores the treated water through a second transport path; A concentrated water storage unit for receiving and storing the concentrated water through a third transfer path and a fourth transfer path branched from the third transfer path; The condensed water installed between the third transfer path and the branching point of the fourth transfer path, and the combined point of the second transfer path and the third transfer path, and the concentrated water transferred through the third transfer path to the second transfer path A first valve that opens and closes the transferred material; A second valve installed on the fourth transfer path to open and close the concentrated water being transferred to the concentrated water storage unit; A first sensor installed in the first transfer path between the raw water storage unit and the first filter to measure electrical conductivity of raw water transferred to the raw water storage unit; An electrical conductivity estimated to correspond to a predetermined hardness by receiving the electrical conductivity measured from at least one of the second sensor and the first sensor and the second sensor that measures the electrical conductivity of the treated water stored in the production water storage unit It provides an automatic control system for production water hardness, including; a control unit for controlling the opening and closing of the first valve and the second valve according to the comparison result in comparison with a reference value that is a range of.

Further, according to an embodiment of the present invention, the control unit closes (off) the first valve when the electrical conductivity received from one of the first sensor and the second sensor has a value greater than a reference value. , It can be controlled to open the second valve (on).

In addition, according to an embodiment of the present invention, the control unit opens the first valve when the electrical conductivity received from one of the first sensor and the second sensor has a value equal to or less than a reference value, It can be controlled to close the second valve (off).

Further, according to an embodiment of the present invention, a second filter disposed on a first transfer path between the raw water storage unit and the first sensor may be further included.

In addition, according to an embodiment of the present invention, a fifth transfer path for returning the treated water stored in the production water storage unit to the raw water storage unit by a second pump may be further included.

Further, according to an embodiment of the present invention, the concentrated water stored in the concentrated water storage unit may further include a sixth transportation path for returning the concentrated water to the raw water storage unit by a third pump.

In addition, according to an embodiment of the present invention, the control unit, the control unit,

When the volume of the raw water stored in the raw water storage unit from the third sensor disposed in the raw water storage unit is equal to or less than a preset reference storage amount, and the electrical conductivity input from the second sensor is greater than the reference value, the second pump is used. The processed water stored in the production water storage unit may be returned to the raw water storage unit through the fifth transport path.

In addition, according to an embodiment of the present invention, the control unit, the control unit, the volume of the raw water stored in the raw water storage unit from the third sensor disposed in the raw water storage unit is less than a predetermined reference storage amount, the control When the electrical conductivity input from the 2 sensors is smaller than the reference value, the third pump may be used to return the treated water stored in the concentrated water storage unit to the raw water storage unit through the sixth transfer path.

Further, according to an embodiment of the present invention, the reference value may be estimated by non-linear regression analysis of electrical conductivity according to the hardness of the raw water.

According to an embodiment of the present invention made as described above, while setting the desired hardness in advance and measuring the electrical conductivity in real time while manufacturing the production water using raw water, according to the measured electrical conductivity, the first valve and By automatically controlling the second valve to produce production water, production water that meets the desired hardness can be efficiently produced. Of course, the scope of the present invention is not limited by these effects.

1 is a schematic diagram of an automatic hardness control system according to an embodiment of the present invention.
2 is a flowchart of a control method of an automatic hardness control system according to an embodiment of the present invention.
3 and 4 exemplarily show a method of operating the automatic hardness control system according to one embodiment of the present invention.
5 is a schematic diagram showing the movement paths of the production water and the concentrated water by measuring the electrical conductivity of the production water after the end condition is satisfied.
6 is a graph of regression analysis for deriving an EC-HD function according to an embodiment of the present invention.

For a detailed description of the present invention, which will be described later, reference is made to the accompanying drawings that illustrate, by way of example, specific embodiments in which the present invention may be practiced. These examples are described in detail enough to enable those skilled in the art to practice the present invention. It should be understood that the various embodiments of the present invention are different, but need not be mutually exclusive. For example, certain shapes, structures, and properties described herein may be implemented in other embodiments without departing from the spirit and scope of the invention in relation to one embodiment. In addition, it should be understood that the location or placement of individual components within each disclosed embodiment can be changed without departing from the spirit and scope of the invention. Therefore, the following detailed description is not intended to be taken in a limiting sense, and the scope of the present invention, if appropriately described, is limited only by the appended claims, along with all ranges equivalent to those claimed. In the drawings, similar reference numerals refer to the same or similar functions across various aspects, and length, area, thickness, and the like may be exaggerated for convenience.

In addition, before explaining each configuration, raw water means water that is a target of treatment, such as groundwater stored in the raw water storage unit. In addition, the raw water that has been stored in the raw water storage unit may be referred to as the first treated water filtered by the second filter, and the processed water filtered from the first filter and all processed water may be produced. It can be referred to as.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings in order to enable those skilled in the art to easily implement the present invention.

1 is a schematic diagram of an automatic hardness control system according to an embodiment of the present invention. As shown in FIG. 1, the automatic control system for hardness of production water according to an embodiment of the present invention includes a control unit 10, a raw water storage unit 20, a first filter 50, and a production water storage unit 100 And a concentrated water storage unit 120.

In more detail, the raw water storage unit 20 and the raw water transferred from the raw water storage unit 20 through the first transfer path P1 by the first pump 40 are filtered to branch into treated water and concentrated water. The first filter 50, the production water storage unit 100 for receiving and storing the treated water through the second transport path P2, the third transport path P3 and the third transport path ( It consists of a concentrated water storage unit 120 to receive and store through the fourth transfer path (P4) branching from P3).

The raw water storage unit 20 is a space for storing raw water such as ground water, which is a target of processing. In addition, the raw water storage unit 20 may further include a third sensor 90 capable of measuring the storage amount of the raw water stored in the raw water storage unit 20, for example, a volume. For example, the third sensor 90 may be a water level measurement sensor that measures the water level of the raw water stored in the raw water storage unit 20.

A second filter 51, a first sensor 30, and a first pump 40 may be disposed in the first transport path P1 between the raw water storage unit 20 and the first filter 50. . The first pump 40 is a pump operated to transfer the raw water from the raw water storage unit 20 into the system when the system is operated.

The first sensor 30 is a sensor that measures the electrical conductivity of the primary treated water that has passed through the second filter 51.

The second filter 51 is a micro filter, and serves to primarily filter simple floats or other pollutants contained in raw water. The primary treated water that has passed through the second filter 51 is filtered again by the first filter 50.

The first filter 50 is a nano filter, and it is possible to significantly change the hardness of the treated water by filtering ions contained in the primary treated water. The primary treated water filtered by the first filter 50 is reduced in ionic concentration, resulting in production water that is close to ultrapure water.

On the other hand, the primary treated water that has passed through the first filter 50 is branched into production water and concentrated water, respectively, by the second transport path P2 and the third transport path P3. The concentrated water is treated water other than production water filtered by the first filter 50 among the primary treated water, and the concentration of ions is concentrated.

The product water filtered by the first filter 50 is transferred along the second transport path P2 and stored in the product water storage unit 100. The production water stored in the production water storage 100 may be measured in real time by the second sensor 60. Meanwhile, the concentrated water filtered by the first filter 50 is transferred through the third transport path P3 and the fourth transport path P4 and stored in the concentrated water storage unit 120.

The third transport path P3 is merged with the second transport path P2 at the merge point M. In addition, the fourth transfer path P4 is branched from the third transfer path P3 and the branch point S to be connected to the concentrated water storage unit 120.

The first valves 70 and Vm include the branch point S of the third transfer path P3 and the fourth transfer path P4, and the merge point of the second transfer path P2 and the third transfer path P3 ( M) is installed between the third transfer path (P3) is transferred to the concentrated water is transferred to the second transfer path to open and close.

The second valves 80 and Vd are installed on the fourth transfer path PM to open and close the concentrated water being transferred to the concentrated water storage unit 120.

The control unit 10 receives the electrical conductivity of the primary treated water from the first sensor 30 or the electrical conductivity of the produced water stored in the production water storage unit 100 from the second sensor 60, based on this An electric signal is applied to the valve 70 and the second valve 80 to control opening and closing.

Specifically, the control unit 10 receives the electrical conductivity from the first sensor 30 or the second sensor 60, and performs a procedure for comparing it with a preset reference value. Here, the reference value is a range of electrical conductivity estimated to correspond to a predetermined hardness.

In order to set the reference value, first, the result of water quality analysis and electrical conductivity of water to be treated in advance are regressed to derive the relationship between water hardness and electrical conductivity in the form of a function. This function is referred to as an EC-HD function. When the EC-HD function is derived, the operator can input the target hardness using the EC-HD function, and calculate the corresponding electrical conductivity therefrom. Therefore, the reference value may be defined as a range of electrical conductivity calculated when a target hardness is input using the EC-HD function.

As an embodiment, FIG. 6 shows the hardness (HD) of water to be treated and the electrical conductivity (EC) accordingly, and Table 1 shows the results of the nonlinear regression analysis.

Value Standard Error t-Value Prob> | t | Dependency α 0.07321 0.01422 5.14718 9.74E-05 0.99769 β 1.21304 0.03819 31.76297 6.66E-16 0.99769

As a result of examining the existence of a functional relationship of EC = αHD ^β between EC and HD through a box-cox transformation experiment of variables before nonlinear analysis, it appeared to be significant and analyzed by applying its model. As a result, each coefficient was 0.073 and 1.213, and a significant result was obtained with Adjusted R-Square = 0.9954. In addition, in the residual analysis according to the estimation result, the normality condition of the residual was met, and the predicted MAPE was also reduced.

The control unit 10 has such an EC-HD function built-in, so when a worker inputs a target hardness, it is converted into a corresponding electric conductivity and set as a reference value. Thereafter, the electrical conductivity inputted from the first sensor 30 and the second sensor 60 is compared.

The control unit 10 may include a graphic user interface capable of inputting hardness. The graphic user interface may be configured in the form of a touch panel to easily input the desired hardness. Further, the electrical conductivity measured by the first sensor 70, the second sensor 80, and the third sensor 90 may be displayed on a graphical user interface.

The control unit 10 receives the electrical conductivity measured from at least one of the first sensor 30 and the second sensor 60, and compares it with a reference value that is a range of electrical conductivity estimated to correspond to a predetermined hardness. Accordingly, opening and closing of the first valve 70 and the second valve 80 may be controlled.

More specifically, when the electrical conductivity received from any one of the first sensor 30 and the second sensor 60 has a value greater than a reference value, the first valve is closed and the second valve is turned off. It can be controlled to open (on).

In addition, when the electrical conductivity received from one of the first sensor 30 and the second sensor 60 has a value equal to or less than the reference value, the first valve 70 is opened and the second valve 80 is turned on. It can be controlled to close (off).

In addition, the control unit 10, the volume of the raw water stored in the raw water storage unit 20 from the third sensor 90 disposed in the raw water storage unit 20 is less than a preset reference storage amount, input from the second sensor When the electrical conductivity is greater than the reference value, the production water stored in the production water storage unit 100 is transferred to the raw water storage unit 20 through the fifth transfer path P5 using the second pump 110. Can be controlled to do so.

In addition, the control unit 10, the volume of the raw water stored in the raw water storage unit 20 from the third sensor 90 disposed in the raw water storage unit 20 is less than a predetermined reference storage amount, the second sensor When the electrical conductivity inputted from the reference value is less than the reference value, the concentrated water stored in the concentrated water storage unit 120 using the third pump 130 may be stored in the raw water storage unit through the sixth transfer path P6. 20).

Figure 2 shows a flow chart for a method of controlling the hardness automatic control system according to an embodiment of the present invention, hereinafter, the operation of the automatic water hardness control system according to the comparison of the electrical conductivity of the primary treatment water and production water The method will be described as an example.

The raw water stored in the raw water storage unit 120 is transferred to the second filter 51 to filter impurities such as suspended matter contained in the raw water.

The primary filter treated primary water is measured by electrical conductivity in the first sensor 30. At this time, the initial states of the first valve 70 and the second valve 80 are set by the measured electrical conductivity (ECo) of the primary treatment water.

Table 2 shows the valve open / close setting state according to the electrical conductivity of the primary treated water and the produced water.

Valve setting valve Early In operation (second sensor) 1st setting 1st valve (Vm) = off
Second valve (Vd) = on ECo> ECu ECt> ECu Second setting 1st valve (Vm) = on
Second valve (Vd) = off ECo ≤ ECu ECt ≤ ECu

For example, as shown in FIG. 3, if the electrical conductivity (ECo) of the primary treated water is greater than a predetermined reference value (electrical conductivity of the targeted production water, ECu) as shown in the first setting in Table 1, The initial setting is made to close the first valve 70 and open the second valve 80.

More specifically, as shown in FIG. 3, when the electrical conductivity (ECo) of the primary treated water is greater than the reference value of the preset production water, the first valve 70 is closed and the second valve is turned off. (80) is opened (on) to transfer the product water coming through the first filter 50 to the product water storage unit 100 through the second transport path P2, and to exit the product water through the first filter 50 The concentrated water is transferred to the concentrated water storage unit 120 through the third transport path P3 and the fourth transport path P4.

As another example, if the electrical conductivity (ECo) of the primary treatment water is less than or equal to the reference value of the preset production water, as shown in the second setting of Table 1, as shown in FIG. 4, the first valve 70 is opened (on ), And the initial setting is made to close the second valve 80.

More specifically, as shown in FIG. 4, if the electrical conductivity (ECo) of the primary treated water is less than or equal to the reference value of the preset production water, the first valve 70 is opened and turned on. 2 By closing (off) the valve 80, the concentrated water coming out from the first filter 50 and mixed production water are transferred to the production water storage 100 through the second transfer path P2.

When the initial states of the first valve 70 and the second valve 80 are set by the first sensor 30, the first valve 70 and the first valve 70 are controlled by the second sensor 60 during operation of the system. 2 The state of the valve 80 is controlled.

That is, the second sensor 60 continuously measures the electrical conductivity (ECt) of the production water stored in the production water storage unit 100 in real time, and the electrical conductivity (ECt) of the production water and a predetermined reference value of the production water ( The electrical conductivity of the target production water, ECu) is compared to control whether the first valve and the second valve are opened or closed.

If, when the electrical conductivity (ECt) of the production water is greater than the predetermined reference value of the production water, as shown in Figure 3, the first valve 70 is closed (off), the second valve 80 is opened (on) to transfer the production water coming through the first filter 50 to the production water storage unit 100 through the second transfer path (P2), the concentrated water coming out through the first filter 50 is the fourth It is transferred to the concentrated water storage unit 120 through the transfer path P4.

If, when the electrical conductivity (ECt) of the production water is less than or equal to the reference value of the preset production water, as shown in Figure 4, the first valve 70 is opened (on), the second valve 80 By closing (off), the concentrated water is transferred to the production water storage unit 100 is mixed.

The second sensor 60 produces the production water and measures the electrical conductivity value in real time until the system is terminated, and transmits the value to the control unit in real time, whereby the control unit controls the first valve 70 and the second valve ( 80) is continuously controlled in real time.

According to this embodiment of the present invention, as the control unit 10 controls the first and second valves 70 and 80 based on this while measuring the electrical conductivity of the treated water processed in the system in real time It is possible to effectively produce water within the hardness range previously input to the control unit 10.

As described above, the volume of raw water stored in the raw water storage unit 20 using the third sensor 90 during the process of manufacturing the production water is equal to or less than a preset reference storage amount (for example, raw water residual amount is 0 as shown in FIG. 2). If) is sensed, the operation of the first pump 40 is stopped to stop the hardness control system, and the electrical conductivity (ECt) of the production water in the production water storage 100 through the second sensor 60 is stopped. Is measured.

If the electrical conductivity (ECt) of the production water measured through the second sensor 60 is included within a preset reference value range, production of the production water is completed.

However, when the electrical conductivity (ECt) of the production water is greater than the reference value of the production water (the electrical conductivity of the target production water, ECu), as shown in FIG. 5, the control unit 10 may not operate the second pump 110. It operates and transfers the production water from the production water storage unit 100 to the raw water storage unit 20 through the fifth transfer path P5. Next, the above-described processing steps are repeatedly performed. This repeating step is performed until the volume of raw water stored in the raw water storage unit 20 is equal to or less than the preset reference storage amount and the electrical conductivity (ECt) of the production water is included within the reference value range.

If the electrical conductivity (ECt) of the production water is smaller than the reference value of the production water (the electrical conductivity of the target production water, ECu), the third pump 130 is operated and concentrated through the sixth transfer path P6. The concentrated water stored in the water storage unit 120 is transferred to the raw water storage unit 20. Next, the above-described processing steps are repeatedly performed.

When the electrical conductivity of the product water is smaller than the reference value, it means that the hardness, that is, the concentration of ions in the product water is low. In this case, the concentrated water stored in the concentrated water storage unit 120 is returned to the raw water storage unit 20 for carrying back the concentrated water having a high ion concentration, thereby supplying ions into the production water having insufficient ions to satisfy a reference value. The effect of becoming higher can be obtained.

As described above, the present invention, by setting the desired hardness in advance, by measuring the electrical conductivity in real time during the production of production water using raw water, and according to the measured electrical conductivity, the first valve and the second valve automatically It has the effect of providing for a hardness automatic control system that manufactures water by controlling.

The present invention has been illustrated and described with reference to preferred embodiments, as described above, but is not limited to the above embodiments and is varied by those skilled in the art to which the present invention pertains without departing from the spirit of the present invention. Modifications and modifications are possible. Such modifications and variations are to be regarded as falling within the scope of the invention and appended claims.

10: control unit
20: raw water storage unit
30: first sensor
40: first pump
50: first filter
51: second filter
60: second sensor
70: first valve (70)
80: second valve (80)
90: third sensor
100: production water storage
110: second pump
120: concentrated water storage unit
130: third pump
P 1: 1st conveyance
P 2: 2nd transfer path
P 3: 3rd transfer path
P 4: 4th transfer path
P 5: 5th conveyance
P 6: 6th conveyance
M: Hapkido
S: Junction

Claims (9)

Raw water storage unit;
A first filter for filtering raw water transferred through the first transfer path by the first pump from the raw water storage unit and branching it into treated water and concentrated water;
A production water storage unit that receives and stores the treated water through a second transport path;
A concentrated water storage unit for receiving and storing the concentrated water through a third transfer path and a fourth transfer path branched from the third transfer path;
The concentrated water that is installed between the third transfer path and the fourth transfer path and the third transfer path is installed between the second transfer path and the third transfer path, and the concentrated water is transferred through the third transfer path to the second transfer path. A first valve that opens and closes the transferred material;
A second valve installed on the fourth transfer path to open and close the concentrated water being transferred to the concentrated water storage unit;
A first sensor installed in the first transfer path between the raw water storage unit and the first filter to measure electrical conductivity of raw water transferred from the raw water storage unit;
A second sensor for measuring the electrical conductivity of the treated water stored in the production water storage unit and
The first valve and the second valve according to a comparison result by receiving the electrical conductivity measured from at least one of the first sensor and the second sensor and comparing it with a reference value that is a range of the electrical conductivity estimated to correspond to a predetermined hardness Control unit for controlling the opening and closing of;
Containing,
Automatic water hardness control system. According to claim 1,
The control unit,
When the electrical conductivity inputted from any one of the first sensor and the second sensor has a value greater than a reference value, the first valve is closed, and the second valve is controlled to be opened. ,
Automatic water hardness control system. According to claim 1,
The control unit,
When the electrical conductivity received from any one of the first sensor and the second sensor has a value equal to or less than a reference value, control to open the first valve and close the second valve (off).
Automatic water hardness control system. According to claim 1,
Further comprising a second filter disposed on a first transfer path between the raw water storage unit and the first sensor,
Automatic water hardness control system. According to claim 1,
Further comprising a fifth transfer path for returning the treated water stored in the production water storage unit to the raw water storage unit by a second pump,
Automatic water hardness control system. According to claim 1,
Further comprising a sixth transfer path for returning the concentrated water stored in the concentrated water storage unit to the raw water storage unit by a third pump,
Automatic water hardness control system. The method of claim 5,
The control unit,
When the volume of the raw water stored in the raw water storage unit from the third sensor disposed in the raw water storage unit is equal to or less than a preset reference storage amount, and when the electrical conductivity input from the second sensor is greater than the reference value, the second pump is used. To return the processed water stored in the production water storage unit to the raw water storage unit through the fifth transfer path,
Automatic water hardness control system. The method of claim 6,
The control unit,
When the volume of the raw water stored in the raw water storage unit from the third sensor disposed in the raw water storage unit is equal to or less than a preset reference storage amount, and the electrical conductivity input from the second sensor is smaller than the reference value, the third pump is used. By returning the treated water stored in the concentrated water storage unit to the raw water storage unit through the sixth transfer path,
Automatic water hardness control system. According to claim 1,
The reference value is estimated by non-linear regression analysis of electrical conductivity according to the hardness of raw water,
Automatic water hardness control system.

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