Method for regulating the hardness of the water outlet from an electrochemical water softening plant and system therefor

Abstract

The application discloses a method and system for adjusting the hardness of water outlet of an electrochemical water softening device, wherein the method comprises: arranging multiple groups of electrochemical blocking units in the electrochemical water softening device to reduce the hardness of water outlet of the electrochemical water softening device to a predetermined range, wherein the hardness of water outlet is reduced with the increase of the number of the electrochemical blocking units; and arranging the applied voltage of the multiple groups of electrochemical blocking units to adjust the hardness of water outlet of the electrochemical water softening device to a predetermined value in the predetermined range. The hardness of water outlet of the electrochemical water softening device can be finely controlled through the application.

Description

Technical Field

[0001] This invention relates to the field of electrochemical water softening technology, and in particular to a method and system for adjusting the hardness of the effluent from an electrochemical water softening device. Background Technology

[0002] The hardness of drinking water is determined by the content of calcium and magnesium ions it contains. Different ages, different application scenarios, and different population groups have different requirements for the hardness of drinking water.

[0003] Ultrafiltration membrane technology is widely used to completely retain mineral ions, primarily calcium and magnesium ions, in water. However, considering the significant regional differences in water quality across China, ultrafiltration alone is insufficient to meet the diverse needs of various regions and cannot finely adjust the content of calcium and magnesium ions. Electrodialysis removes all charged ions, failing to meet the need for selective control of calcium and magnesium ion content. Existing technologies also increase the mineral content of the effluent by adding a mineral filter after the reverse osmosis filter, but this approach cannot achieve fine adjustment of the mineral content. In conclusion, existing technologies cannot achieve fine adjustment of drinking water hardness. Summary of the Invention

[0004] The main objective of this invention is to provide a method and system for adjusting the hardness of water output from an electrochemical water softening device, in order to solve the problem that the hardness of drinking water cannot be precisely adjusted in existing methods.

[0005] According to an embodiment of the present invention, a method for adjusting the hardness of the effluent from an electrochemical water softening device is provided, comprising: setting multiple sets of electrochemical scale inhibition units in the electrochemical water softening device to reduce the hardness of the effluent from the electrochemical water softening device to a predetermined range, wherein the hardness of the effluent decreases as the number of the electrochemical scale inhibition units increases; setting the applied voltage of the multiple sets of electrochemical scale inhibition units to adjust the hardness of the effluent from the electrochemical water softening device to a predetermined value within the predetermined range.

[0006] The step of setting the applied voltage for the multiple groups of electrochemical scale inhibition units includes setting a different applied voltage for each of the multiple groups of electrochemical scale inhibition units, wherein the voltage ranges from 18 to 36 volts.

[0007] The step of setting the applied voltage for the multiple sets of electrochemical scale inhibition units includes: setting a gradient voltage for the multiple sets of electrochemical scale inhibition units, wherein the applied voltage of the electrochemical scale inhibition unit located downstream of the water flow is greater than or equal to the applied voltage of its upstream adjacent electrochemical scale inhibition unit, wherein the voltage difference between two adjacent sets of electrochemical scale inhibition units is any value between 0 and 12 volts.

[0008] The step of setting the applied voltage for the multiple sets of electrochemical scale inhibition units includes setting the same applied voltage for the multiple sets of electrochemical scale inhibition units, wherein the voltage ranges from 18 to 36 volts.

[0009] The number of the multiple sets of electrochemical scale inhibition units is any one of 2 to 6.

[0010] According to an embodiment of the present invention, a system for adjusting the hardness of the effluent from an electrochemical water softening device is also provided, comprising: a first setting module for setting multiple sets of electrochemical scale inhibition units in the electrochemical water softening device to reduce the hardness of the effluent from the electrochemical water softening device to a predetermined range, wherein the hardness of the effluent decreases as the number of the electrochemical scale inhibition units increases; and a second setting module for applying a voltage to the multiple sets of electrochemical scale inhibition units to adjust the hardness of the effluent from the electrochemical water softening device to a predetermined value within the predetermined range.

[0011] The second setting module is further configured to set a different applied voltage for each of the multiple sets of electrochemical scale inhibition units, wherein the voltage ranges from 18 to 36 volts.

[0012] The second setting module is further configured to set a gradient voltage for the multiple sets of electrochemical scale inhibition units, wherein the applied voltage of the electrochemical scale inhibition unit located downstream of the water flow is greater than or equal to the applied voltage of its upstream adjacent electrochemical scale inhibition unit, and the voltage difference between two adjacent sets of electrochemical scale inhibition units is any value between 0 and 12 volts.

[0013] The second setting module is further configured to set the same applied voltage for the multiple sets of electrochemical scale inhibition units, wherein the voltage ranges from 18 to 36 volts.

[0014] The first setting module is provided with any number of electrochemical scale inhibition units, from 2 to 6, in the electrochemical water softening equipment.

[0015] According to the technical solution of the present invention, by setting multiple sets of electrochemical scale inhibition units in the electrochemical water softening equipment, the hardness of the outlet water of the electrochemical water softening equipment is coarsely adjusted to a predetermined range. By setting multiple sets of applied voltages for the electrochemical water softening equipment, the hardness of the outlet water of the electrochemical water softening equipment is finely adjusted to a predetermined value. Thus, the hardness of the outlet water of the electrochemical water softening equipment can be finely adjusted, meeting the needs of personalization and different usage scenarios. Attached Figure Description

[0016] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings:

[0017] Figure 1 This is a flowchart of a method for adjusting the hardness of the effluent from an electrochemical water softening device according to an embodiment of the present invention;

[0018] Figure 2 This is a schematic diagram of the hardness of the effluent from an electrochemical water softening device after applying different voltage schemes to two sets of electrochemical scale inhibition units according to an embodiment of the present invention.

[0019] Figure 3 This is a schematic diagram of the hardness of the effluent from an electrochemical water softening device after applying different voltage schemes to three sets of electrochemical scale inhibition units according to an embodiment of the present invention.

[0020] Figure 4 This is a schematic diagram of the hardness of the effluent from an electrochemical water softening device after applying different voltage schemes to four sets of electrochemical scale inhibition units according to an embodiment of the present invention.

[0021] Figure 5 This is a schematic diagram of the hardness of the effluent from an electrochemical water softening device after applying different voltage schemes to five groups of electrochemical scale inhibition units according to an embodiment of the present invention.

[0022] Figure 6 This is a schematic diagram of the hardness removal rate of the five electrochemical scale inhibition units according to an embodiment of the present invention under voltages of 18V, 24V and 30V in an electrochemical water softening device. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0024] Although the present invention specification may include various different embodiments, it should be understood that, with regard to some preferred embodiments described in detail in the specification and shown in the accompanying drawings, the contents disclosed in the present invention specification should be regarded as illustrative of the principles of the invention, and the embodiments shown are not intended to limit the scope of protection of the present invention.

[0025] The technical solutions provided by the various embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0026] In view of the fact that with the development of the times, the requirements for water hardness vary among different ages, groups, and application scenarios. Water softening equipment that can only provide a single water hardness or cannot finely adjust the water hardness can no longer meet the water needs under different conditions. According to an embodiment of the present invention, a method for adjusting the hardness of the output water from an electrochemical water softening device is provided. The electrochemical water softening device is generally installed in a water softening system to provide users with drinking water of the required hardness. (Reference) Figure 1 The adjustment method according to an embodiment of the present invention includes the following steps:

[0027] Step S102: Multiple sets of electrochemical scale inhibition units are installed in the electrochemical water softening equipment to reduce the hardness of the effluent from the electrochemical water softening equipment to a predetermined range, wherein the effluent hardness decreases as the number of electrochemical scale inhibition units increases.

[0028] In this step, the hardness of the effluent from the electrochemical water softening device is coarsely adjusted by setting the required number of electrochemical scale inhibition units within the device. Preferably, the number of electrochemical scale inhibition units can be 2, 3, 4, 5, or 6 sets. However, this invention does not limit the number of electrochemical scale inhibition units, and other numbers are possible in other embodiments. Different numbers of electrochemical scale inhibition units correspond to different ranges of effluent hardness; the more electrochemical scale inhibition units there are, the lower the effluent hardness of the electrochemical water softening device.

[0029] Step S104: Apply voltage to the multiple sets of electrochemical scale inhibition units to adjust the hardness of the effluent from the electrochemical water softening device to a predetermined value within the predetermined range.

[0030] In this step, a direct-flow control power supply is connected to multiple sets of electrochemical scale inhibition units installed in the electrochemical water softening equipment. Voltage is applied to these units, and by setting the applied voltage value, the hardness of the effluent from the electrochemical water softening equipment is finely adjusted to further refine the hardness, which was reduced to a certain range in step S102, to a specific value. Specifically, the voltage applied to the multiple sets of electrochemical scale inhibition units can be the same or different voltages. In this embodiment, the voltage applied to each electrochemical scale inhibition unit is between 18-36V.

[0031] In some embodiments of this application, gradient voltages can be applied to multiple sets of electrochemical scale inhibition units. The gradient voltages include increasing and decreasing gradient voltages. When an increasing gradient voltage is applied to multiple sets of electrochemical scale inhibition units, the voltage of the downstream electrochemical scale inhibition unit is greater than or equal to the voltage of the upstream electrochemical scale inhibition unit; when a decreasing gradient voltage is applied to multiple sets of electrochemical scale inhibition units, the voltage of the downstream electrochemical scale inhibition unit is less than or equal to the voltage of the upstream electrochemical scale inhibition unit. In this embodiment of the invention, when a gradient voltage is applied to multiple sets of electrochemical scale inhibition units, the voltage difference (gradient) between two adjacent sets of electrochemical scale inhibition units can be any value between 0 and 12V, such as 1, 2, 3, 4, 6, 8, 12, etc., and this application does not impose any limitation on this. For example, when the gradient between two adjacent sets of electrochemical scale inhibition units is 6V, the voltage applied to each set of electrochemical scale inhibition units can be 18V, 24V, 30V, or 36V.

[0032] The following experiments were conducted on different voltage schemes applied to electrochemical scale inhibition units with different numbers of units. The hardness of the effluent water samples was determined using the standard method of GB / T5750-2006. Effluent water samples from the electrochemical water softening equipment were collected at 5, 10, 15, 30, 45, and 60 minutes after the voltage was applied to the electrochemical scale inhibition units, as detailed below:

[0033] Two sets of electrochemical scale inhibition units are installed in the electrochemical water softening equipment.

[0034] This scheme has the following three specific voltage application schemes, in which the first and second groups of electrochemical scale inhibition units are set in sequence according to the direction of water flow from upstream to downstream.

[0035] Gradient voltage scheme 1: The voltage applied to the first group of electrochemical scale inhibition units is 24V, and the voltage applied to the second group of electrochemical scale inhibition units is 30V.

[0036] Gradient voltage scheme 2: The voltage applied to the first group of electrochemical scale inhibition units is 18V, and the voltage applied to the second group of electrochemical scale inhibition units is 24V.

[0037] Control scheme: The voltage applied to the electrochemical scale inhibition units of the first and second groups is 24V.

[0038] like Figure 2As shown, when voltage is applied to the electrochemical scale inhibition unit according to gradient voltage scheme 1, the hardness of the effluent from the electrochemical water softening equipment after 60 minutes of operation is 111.9 ppm; when voltage is applied to the electrochemical scale inhibition unit according to gradient voltage scheme 2, the hardness of the effluent from the electrochemical water softening equipment after 60 minutes of operation is 132.8 ppm; and when voltage is applied to the electrochemical scale inhibition unit according to the control scheme, the hardness of the effluent from the electrochemical water softening equipment after 60 minutes of operation is 122.2 ppm.

[0039] Three sets of electrochemical scale inhibition units are installed in the electrochemical water softening equipment.

[0040] This scheme has the following three specific voltage application schemes, in which the first group, the second group and the third group of electrochemical scale inhibition units are set in sequence according to the direction of water flow from upstream to downstream.

[0041] Gradient voltage scheme 1: The voltage applied to the first group of electrochemical scale inhibition units is 24V, the voltage applied to the second group of electrochemical scale inhibition units is 30V, and the voltage applied to the third group of electrochemical scale inhibition units is 36V.

[0042] Gradient voltage scheme 2: The voltage applied to the first group of electrochemical scale inhibition units is 18V, the voltage applied to the second group of electrochemical scale inhibition units is 18V, and the voltage applied to the third group of electrochemical scale inhibition units is 24V.

[0043] Control scheme: The voltage applied to the electrochemical scale inhibition units of the first, second and third groups is 24V.

[0044] like Figure 3 As shown, when voltage is applied to the electrochemical scale inhibition unit according to gradient voltage scheme 1, the hardness of the effluent from the electrochemical water softening equipment after 60 minutes of operation is 85.4 ppm; when voltage is applied to the electrochemical scale inhibition unit according to gradient voltage scheme 2, the hardness of the effluent from the electrochemical water softening equipment after 60 minutes of operation is 108.6 ppm; and when voltage is applied to the electrochemical scale inhibition unit according to the control scheme, the hardness of the effluent from the electrochemical water softening equipment after 60 minutes of operation is 95.8 ppm.

[0045] Four sets of electrochemical scale inhibition units are installed in the electrochemical water softening equipment.

[0046] This scheme has three specific voltage application schemes, in which the first, second, third and fourth groups of electrochemical scale inhibition units are set in sequence according to the direction of water flow from upstream to downstream.

[0047] Gradient voltage scheme 1: The voltage applied to the first group of electrochemical scale inhibition units is 24V, the voltage applied to the second group of electrochemical scale inhibition units is 24V, the voltage applied to the third group of electrochemical scale inhibition units is 30V, and the voltage applied to the fourth group of electrochemical scale inhibition units is 36V.

[0048] Gradient voltage scheme 2: The voltage applied to the first group of electrochemical scale inhibition units is 18V, the voltage applied to the second group of electrochemical scale inhibition units is 18V, the voltage applied to the third group of electrochemical scale inhibition units is 24V, and the voltage applied to the fourth group of electrochemical scale inhibition units is 24V.

[0049] Control scheme: The voltage applied to the electrochemical scale inhibition units of groups one, two, three and four is 24V.

[0050] like Figure 4 As shown, when voltage is applied to the electrochemical scale inhibition unit according to gradient voltage scheme 1, the hardness of the effluent from the electrochemical water softening equipment after 60 minutes of operation is 65.8 ppm; when voltage is applied to the electrochemical scale inhibition unit according to gradient voltage scheme 2, the hardness of the effluent from the electrochemical water softening equipment after 60 minutes of operation is 85.7 ppm; and when voltage is applied to the electrochemical scale inhibition unit according to the control scheme, the hardness of the effluent from the electrochemical water softening equipment after 60 minutes of operation is 72.2 ppm.

[0051] Five electrochemical scale inhibition units are installed in the electrochemical water softening equipment.

[0052] This scheme includes four specific voltage application schemes, in which the first, second, third, fourth and fifth groups of electrochemical scale inhibition units are set in sequence according to the direction of water flow from upstream to downstream.

[0053] Gradient voltage scheme 1: The voltage applied to the first group of electrochemical scale inhibition units is 24V, the voltage applied to the second group of electrochemical scale inhibition units is 24V, the voltage applied to the third group of electrochemical scale inhibition units is 30V, the voltage applied to the fourth group of electrochemical scale inhibition units is 30V, and the voltage applied to the fifth group of electrochemical scale inhibition units is 36V.

[0054] Gradient voltage scheme 2: The voltage applied to the first group of electrochemical scale inhibition units is 36V, the voltage applied to the second group of electrochemical scale inhibition units is 36V, the voltage applied to the third group of electrochemical scale inhibition units is 30V, the voltage applied to the fourth group of electrochemical scale inhibition units is 24V, and the voltage applied to the fifth group of electrochemical scale inhibition units is 24V.

[0055] Gradient voltage scheme 3: The voltage applied to the first group of electrochemical scale inhibition units is 18V, the voltage applied to the second group of electrochemical scale inhibition units is 18V, the voltage applied to the third group of electrochemical scale inhibition units is 24V, the voltage applied to the fourth group of electrochemical scale inhibition units is 24V, and the voltage applied to the fifth group of electrochemical scale inhibition units is 24V.

[0056] Control scheme: The voltage applied to the electrochemical scale inhibition units of groups 1, 2, 3, 4 and 5 is 24V.

[0057] like Figure 5 As shown, when voltage is applied to the electrochemical scale inhibition unit according to gradient voltage scheme 1, the hardness of the effluent from the electrochemical water softening equipment after 60 minutes of operation is 15.3 ppm; when voltage is applied to the electrochemical scale inhibition unit according to gradient voltage scheme 2, the hardness of the effluent from the electrochemical water softening equipment after 60 minutes of operation is 22.1 ppm; when voltage is applied to the electrochemical scale inhibition unit according to gradient voltage scheme 3, the hardness of the effluent from the electrochemical water softening equipment after 60 minutes of operation is 63.2 ppm; and when voltage is applied to the electrochemical scale inhibition unit according to the control scheme, the hardness of the effluent from the electrochemical water softening equipment after 60 minutes of operation is 32.6 ppm.

[0058] Reference Figures 2 to 5 For devices with two, three, four, and five electrochemical scale inhibition units, the effluent hardness of the electrochemical water softening equipment was adjusted to ranges of 111.9-132.8 ppm, 85.4-108.6 ppm, 65.8-85.7 ppm, and 15.3-63.2 ppm, respectively. These results show that increasing the number of electrochemical scale inhibition units can reduce the effluent hardness of the electrochemical water softening equipment. This is because the additional units provide extra driving force for electrochemical scale removal. Therefore, by changing the number of electrochemical scale inhibition units in the water softening equipment, the effluent hardness can be coarsely adjusted to within a predetermined range. The number of electrochemical scale inhibition units can be increased or decreased according to the user's specific needs.

[0059] Refer to each Figure 2 , Figure 3 or Figure 4When the same number of electrochemical scale inhibition units are used, the results of gradient voltage scheme 1 and the control scheme show that applying a higher voltage to the downstream electrochemical scale inhibition units reduces the hardness of the effluent from the electrochemical water softener. Conversely, the results of gradient voltage scheme 2 and the control scheme show that reducing the voltage of the upstream electrochemical scale inhibition units increases the hardness of the effluent. From the perspective of the electrochemical scale inhibition mechanism, when water flows through a set of electrochemical scale inhibition units, the relatively "hard" water is "softened," and the concentration of calcium and magnesium ions in the water decreases. Consequently, when the water flows through the next set of electrochemical scale inhibition units, the ohmic drop of the next set of units increases, while simultaneously weakening the diffusion dynamics of calcium and magnesium ions. Therefore, a higher voltage must be applied to the downstream electrochemical scale inhibition units to compensate for the ohmic drop, thereby reducing the hardness of the effluent from the electrochemical water softener.

[0060] refer to Figure 5 Since applying a higher voltage to the upstream electrochemical scale inhibition unit cannot compensate for the ohmic drop, the results of gradient voltage scheme 1 and gradient voltage scheme 2 show that applying a higher voltage to the upstream electrochemical scale inhibition unit is less effective in reducing water hardness than applying a higher voltage to the downstream electrochemical scale inhibition unit. In other words, according to the embodiments of this application, the applied voltage of the downstream electrochemical scale inhibition unit is greater than or equal to the applied voltage of its upstream adjacent electrochemical scale inhibition unit.

[0061] Under identical test conditions and with identical electrochemical scale inhibition units, there exists an optimal voltage that maximizes the hardness removal rate of the electrochemical water softening equipment. Applying a voltage higher than this value to multiple electrochemical scale inhibition units will cause excessive side reactions, leading to an increase in effluent hardness; applying a voltage lower than this value to multiple electrochemical scale inhibition units will result in insufficient driving force, also leading to an increase in effluent hardness. (Reference) Figure 6 When five electrochemical scale inhibition units are installed in an electrochemical water softening system, the optimal voltage is 24V. Therefore, considering the above characteristics, the voltage range applied to multiple sets (e.g., 2, 3, 4, 5, 6 or other numbers) of electrochemical scale inhibition units can be between 18-36V.

[0062] According to an embodiment of the present invention, a system for adjusting the hardness of the effluent from an electrochemical water softening device is also provided, comprising:

[0063] The first setting module is used to set multiple sets of electrochemical scale inhibition units in the electrochemical water softening equipment to reduce the hardness of the effluent from the electrochemical water softening equipment to a predetermined range, wherein the hardness of the effluent decreases as the number of electrochemical scale inhibition units increases.

[0064] The second setting module is used to set the applied voltage for the multiple sets of electrochemical scale inhibition units, so as to adjust the hardness of the outlet water of the electrochemical water softening equipment to a predetermined value within the predetermined range.

[0065] The second setting module is further configured to set a different applied voltage for each of the multiple sets of electrochemical scale inhibition units, wherein the voltage ranges from 18 to 36 volts.

[0066] The second setting module is further configured to set a gradient voltage for the multiple sets of electrochemical scale inhibition units, wherein the applied voltage of the electrochemical scale inhibition unit located downstream of the water flow is greater than or equal to the applied voltage of its upstream adjacent electrochemical scale inhibition unit, and the voltage difference between two adjacent sets of electrochemical scale inhibition units is any value between 0 and 12 volts.

[0067] The second setting module is further configured to set the same applied voltage for the multiple sets of electrochemical scale inhibition units, wherein the voltage ranges from 18 to 36 volts.

[0068] The first setting module is provided with any number of electrochemical scale inhibition units, from 2 to 6, in the electrochemical water softening equipment.

[0069] The structural features of the system and the operational steps of the method of the present invention correspond to each other and can be referred to each other, so they will not be described in detail here.

[0070] In summary, according to the above embodiments of this application, by setting multiple sets of electrochemical scale inhibition units in the electrochemical water softening equipment to coarsely adjust the hardness of the outlet water of the electrochemical water softening equipment to a predetermined range, and then by setting multiple sets of applied voltages for the electrochemical water softening equipment to finely adjust the hardness of the outlet water of the electrochemical water softening equipment to a predetermined value, the hardness of the outlet water of the electrochemical water softening equipment can be precisely controlled.

[0071] Although this disclosure has been described in detail with reference to specific embodiments thereof, those skilled in the art will understand that various changes and modifications may be made therein without departing from the spirit and scope of the embodiments. Therefore, this disclosure is intended to cover modifications and variations thereof, and any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this invention should be included within the scope of the claims of this disclosure and their equivalents.

[0072] Furthermore, features disclosed in the foregoing description, claims, or drawings, expressed in their particular form or according to the manner of performing the disclosed functions or the method or process for obtaining the disclosed results, may, as appropriate, be used alone or in any combination of these features to implement the invention in their different forms. Specifically, one or more features of any embodiment described herein may be combined with one or more features of any other embodiment described herein.

[0073] Protection may also be sought for any features disclosed in any one or more public documents combined with this disclosure and / or merged by reference.

Claims

1. A method for adjusting the hardness of the effluent from an electrochemical water softening device, characterized in that, include: Multiple sets of electrochemical scale inhibition units are installed in the electrochemical water softening equipment to reduce the hardness of the effluent from the electrochemical water softening equipment to a predetermined range, wherein the effluent hardness decreases as the number of electrochemical scale inhibition units increases. A voltage is applied to the multiple sets of electrochemical scale inhibition units to adjust the hardness of the effluent from the electrochemical water softening device to a predetermined value within the predetermined range; The step of setting the applied voltage for the multiple sets of electrochemical scale inhibition units includes: Each of the multiple electrochemical scale inhibition units is given a different applied voltage, the voltage being between 18 and 36 volts. A gradient voltage is set for the multiple sets of electrochemical scale inhibition units. The applied voltage of the electrochemical scale inhibition unit located downstream of the water flow is greater than the applied voltage of its upstream adjacent electrochemical scale inhibition unit. The voltage difference between two adjacent sets of electrochemical scale inhibition units is 6 volts. As water flows through a set of electrochemical scale inhibitor units, the relatively hard water is softened, and the concentration of calcium and magnesium ions in the water decreases. As the water flows through the next set of electrochemical scale inhibitor units, the diffusion kinetics of calcium and magnesium ions are weakened as the ohmic drop of the next set of electrochemical scale inhibitor units increases. A higher voltage is applied to the downstream electrochemical scale inhibitor units to compensate for the ohmic drop.

2. The adjustment method according to claim 1, characterized in that, The number of the multiple sets of electrochemical scale inhibition units is any one from 2 to 6.

3. The adjustment method according to claim 1, characterized in that, A system for adjusting the hardness of effluent from an electrochemical water softening device is used, the system comprising: The first setting module is used to set multiple sets of electrochemical scale inhibition units in the electrochemical water softening equipment to reduce the hardness of the effluent from the electrochemical water softening equipment to a predetermined range, wherein the hardness of the effluent decreases as the number of electrochemical scale inhibition units increases. The second setting module is used to set the applied voltage for the multiple sets of electrochemical scale inhibition units to adjust the hardness of the effluent from the electrochemical water softening device to a predetermined value within the predetermined range; the second setting module is also used to set a different applied voltage for each of the multiple sets of electrochemical scale inhibition units, the voltage range being between 18-36 volts; and to set a gradient voltage for the multiple sets of electrochemical scale inhibition units, wherein the applied voltage of the electrochemical scale inhibition unit located downstream of the water flow is greater than the applied voltage of its upstream adjacent electrochemical scale inhibition unit, wherein the voltage difference between two adjacent sets of electrochemical scale inhibition units is 6 volts.

4. The adjustment method according to claim 3, characterized in that, The first setting module is equipped with any number of electrochemical scale inhibition units, from 2 to 6, in the electrochemical water softening equipment.

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