A smart energy-saving water treatment method and device based on CDI

Abstract

The application discloses a kind of wisdom energy-saving water treatment method and device based on CDI, it is related to water treatment technical field;According to the working mode of water purification module determined by first conductivity;According to the applied voltage of each CDI module determined by working mode, first conductivity and target conductivity;The conductivity of target purified water is collected and recorded as second conductivity;According to second conductivity and target conductivity, the applied voltage of each CDI module is changed, and whether target purified water is used is determined.Through first conductivity, water quality condition can be quickly judged, so as to select appropriate working mode, so that water purification module can be optimized according to specific water quality conditions, and the water treatment efficiency is improved;According to second conductivity, target conductivity dynamically determines the applied voltage of each CDI module, effectively avoids poor water treatment effect caused by too low voltage, energy waste caused by too high voltage, and improves the efficiency of the whole water treatment system.

Description

Technical Field

[0001] This invention belongs to the field of water treatment technology, specifically relating to a smart energy-saving water treatment method and device based on CDI. Background Technology

[0002] With the rapid advancement of industrialization, human society's demand for water resources is increasing daily. However, the resulting water pollution problem is also becoming increasingly prominent, posing a major challenge to sustainable development. Traditional water treatment methods, such as sedimentation, filtration, activated carbon adsorption, and ion exchange, can purify water to some extent, but they generally face problems such as high energy consumption, unstable treatment effects, complex operation, and the potential for secondary pollution. These problems not only increase water treatment costs but may also impose further burdens on the environment.

[0003] Against this backdrop, capacitive deionization (CDI) technology has emerged. CDI is an emerging water treatment technology that utilizes electrochemical principles to remove ions from water through capacitive ion exchange materials. A CDI system consists of alternating cathodes and anodes, with capacitive ion exchange materials filling the spaces between these electrodes. When water passes through these electrodes, ions are adsorbed onto them, thereby reducing the ion concentration in the water and purifying it.

[0004] Existing CDI technologies often employ a constant voltage (constant pressure) mode for water treatment. However, this fixed voltage mode cannot be dynamically adjusted according to water quality conditions during the water treatment process, resulting in low efficiency of the water treatment system. Summary of the Invention

[0005] The purpose of this invention is to solve the problem that a fixed voltage mode cannot be dynamically adjusted according to water quality during the water treatment process, resulting in low working efficiency of the water treatment system. Therefore, this invention proposes a smart energy-saving water treatment method and device based on CDI.

[0006] In a first aspect of this invention, a smart energy-saving water treatment method based on CDI is first proposed, the method comprising:

[0007] The conductivity of the pretreated water is collected as the first conductivity, and the working mode of the water purification module is determined based on the first conductivity. The water purification module includes a parallel module and a series module. The parallel module is formed by M capacitor deionization (CDI) modules connected in parallel. The series module is formed by N CDI modules connected in series, and the applied voltage of the CDI modules in the series module increases sequentially from the inlet to the outlet. The pretreated water is water coming out of the working pump.

[0008] The applied voltage for each CDI module is determined based on the operating mode, the first conductivity, and the target conductivity; the target conductivity is the conductivity of water when it meets minimum usage standards.

[0009] The pretreated water after passing through the water purification module is denoted as the target purified water, and the conductivity of the target purified water is collected and denoted as the second conductivity.

[0010] The applied voltage of each CDI module is changed according to the second conductivity and the target conductivity, and the target purified water is determined to be qualified.

[0011] Optionally, determining the operating mode of the water purification module based on the first conductivity includes:

[0012] If the first conductivity is greater than the first preset conductivity, then the series mode is recorded as the working mode of the water purification module, and the pretreated water only passes through the series module;

[0013] If the first conductivity is less than the second preset conductivity, then the parallel mode is recorded as the working mode of the water purification module, and the pretreated water only passes through the parallel module;

[0014] If the first conductivity is less than the first preset conductivity but greater than the second preset conductivity, then the mixed mode is recorded as the working mode of the water purification module, and the pretreated water passes through the parallel module and the series module simultaneously.

[0015] Optionally, the applied voltage of each CDI module in the series module.

[0016] Through formula Sure;

[0017] Where V0 is the initial voltage of all CDI modules, f(x) is the coefficient equation of the initial voltage, k is the proportionality constant, and l in Let l be the first conductivity. out Let e ​​be the target conductivity, α be the natural constant, t be the adsorption influence factor, t be the current module's running time, Q1 be the rate at which the pretreated water passes through the series module, n be the number of CDI modules connected in series, and x be the Xth CDI module in the series module from the direction of the pretreated water inflow. x The applied voltage for the Xth CDI module.

[0018] Optionally, the applied voltage for each CDI module in the parallel module:

[0019] Through formula Sure;

[0020] Where V0 is the initial voltage of all CDI modules, k is the proportionality constant, and l in Let l be the first conductivity. out Let e ​​be the target conductivity, α be the natural constant, t be the adsorption influence factor, t be the current module's running time, Q2 be the rate at which the pretreated water passes through the parallel module, and V be the voltage. x The applied voltage for the Xth CDI module.

[0021] Optionally, in series mode, adjusting the applied voltage of each CDI module according to the second conductivity and the target conductivity, and determining whether the target purified water is qualified includes:

[0022] If the second conductivity is less than the target conductivity, and the second conductivity is within a preset conductivity range, then the target purified water is transported to the purified water storage location.

[0023] If the second conductivity is less than the target conductivity and the second conductivity is not within the preset conductivity range, then the initial voltage of each CDI module is adjusted according to the first preset step size, and the target purified water is transported to the purified water storage location.

[0024] Optionally, in parallel or hybrid mode, adjusting the applied voltage of each CDI module based on the second conductivity and the target conductivity, and determining whether the target purified water is qualified includes:

[0025] If the second conductivity is less than the target conductivity, the target purified water is transported to the purified water storage location.

[0026] If the second conductivity is greater than the target conductivity, the initial voltage of each CDI module is adjusted according to the second preset step size, and the target purified water is transported to the parallel module.

[0027] Optionally, the method further includes:

[0028] The total voltage applied to the water purification module is monitored in real time. If the total voltage exceeds a preset voltage and remains greater than the preset voltage within a first preset time window, a reverse voltage is applied to the water purification module, and the valve for pretreated water to enter the water purification module is closed, while the valve for reclaimed water to enter the water purification module is opened. The reverse voltage is the preset voltage.

[0029] After the second preset time window, the valve for the reclaimed water to enter the water purification module is closed, and the valve for the pretreated water to enter the water purification module is opened.

[0030] In a second aspect of this invention, a smart energy-saving water treatment device based on CDI is provided, comprising: the device comprising:

[0031] The working mode determination module is used to collect the conductivity of the pretreated water as the first conductivity, and determine the working mode of the water purification module based on the first conductivity. The water purification module includes a parallel module and a series module. The parallel module is formed by M capacitor deionization (CDI) modules connected in parallel. The series module is formed by N CDI modules connected in series. The pretreated water is water coming out of the working pump.

[0032] A voltage application module is used to determine the applied voltage for each CDI module based on the operating mode, the first conductivity, and the target conductivity; the target conductivity is the conductivity of water when it meets the minimum usage standard.

[0033] The target conductivity module is used to define the pretreated water after passing through the water purification module as the target purified water, and to collect the conductivity of the target purified water as the second conductivity.

[0034] The purified water uses a judgment module to change the applied voltage of each CDI module according to the second conductivity and the target conductivity, and to determine whether the target purified water is qualified.

[0035] The beneficial effects of this invention are:

[0036] This invention proposes a smart energy-saving water treatment method based on CDI (Conductivity-Induced Difference) technology. The method collects the conductivity of pretreated water as a first conductivity, and determines the operating mode of the water purification module based on this first conductivity. The applied voltage of each CDI module is determined based on the operating mode, the first conductivity, and a target conductivity. The target conductivity is the conductivity of water meeting minimum usage standards. The pretreated water after passing through the water purification module is designated as the target purified water, and its conductivity is recorded as a second conductivity. The applied voltage of each CDI module is adjusted based on the second conductivity and the target conductivity, and the use of the target purified water is determined. The first conductivity allows for rapid assessment of water quality, enabling the selection of an appropriate operating mode. This allows the water purification module to optimize treatment for specific water quality conditions, improving water treatment efficiency. Furthermore, the applied voltage of each CDI module is dynamically determined based on the second conductivity and the target conductivity, effectively avoiding poor water treatment results due to insufficient voltage and energy waste due to excessive voltage, thus improving the overall efficiency of the water treatment system. Attached Figure Description

[0037] The invention will now be further described with reference to the accompanying drawings.

[0038] Figure 1 A flowchart of a smart energy-saving water treatment method and apparatus based on CDI is provided for embodiments of the present invention;

[0039] Figure 2A block diagram of a smart energy-saving water treatment principle based on CDI is provided for an embodiment of the present invention;

[0040] Figure 3 This invention provides a schematic diagram of a smart energy-saving water treatment device based on CDI. Detailed Implementation

[0041] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The term "and / or" in this document is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and B can represent: A alone, A and B simultaneously, and B alone. Furthermore, descriptions involving "first," "second," etc., in this invention are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" can explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0042] Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0043] This invention provides a smart energy-saving water treatment method based on CDI. See also... Figure 1 , Figure 1 A flowchart illustrating a CDI-based intelligent energy-saving water treatment method provided in this embodiment of the invention. The method includes the following steps:

[0044] S101, collect the conductivity of the pretreated water as the first conductivity, and determine the working mode of the water purification module based on the first conductivity;

[0045] S102, determine the applied voltage for each CDI module based on the operating mode, the first conductivity, and the target conductivity;

[0046] S103, the pretreated water after passing through the water purification module is recorded as the target purified water, and the conductivity of the target purified water is collected and recorded as the second conductivity.

[0047] S104, adjust the applied voltage of each CDI module according to the second conductivity and the target conductivity, and determine whether the target purified water is qualified.

[0048] The water purification module includes parallel modules and series modules; the parallel module is formed by M capacitor deionization (CDI) modules connected in parallel; the series module is formed by N CDI modules connected in series, and the applied voltage of the CDI modules in the series module increases sequentially from the inlet to the outlet; the pretreated water is the water coming out of the working pump; the target conductivity is the conductivity of the water when it meets the minimum usage standard.

[0049] The present invention provides a CDI-based intelligent energy-saving water treatment method. By using a first conductivity value to quickly determine the water quality, an appropriate operating mode can be selected, allowing the water purification module to optimize treatment for specific water quality conditions, thus improving water treatment efficiency. Furthermore, the applied voltage of each CDI module is dynamically determined based on a second conductivity value and a target conductivity value, effectively avoiding poor water treatment results due to insufficient voltage and energy waste due to excessive voltage, thereby improving the efficiency of the entire water treatment system. In one implementation, see [link to implementation details]. Figure 2 The energy-saving water treatment system includes a filter, a working pump, a parallel CDI module, a series CDI module, a first three-way solenoid valve (B), a second three-way solenoid valve (C), a third three-way solenoid valve (D), a four-way solenoid valve (A), and two online conductivity meters. The first three-way solenoid valve includes a first inlet, a second inlet, and an outlet. The second three-way solenoid valve includes an inlet, a first outlet, and a second outlet. The third three-way solenoid valve includes an inlet, a first outlet, and a second outlet. The four-way solenoid valve includes a first inlet, a second inlet, a first outlet, and a second outlet.

[0050] In one implementation, the inlet of the series module is the second outlet of the four-way solenoid valve, and the outlet is the inlet of the second three-way solenoid valve.

[0051] In one implementation, see [link to implementation details]. Figure 2 Raw water passes through a filter and then enters the working pump to obtain pretreated water. The conductivity of the pretreated water is measured using an online conductivity meter. The outlet of the working pump is connected to the first inlet of a four-way solenoid valve. The first outlet of the four-way solenoid valve is connected to the first inlet of a first three-way solenoid valve. The outlet of the first three-way solenoid valve is connected to the inlet of a parallel module. The second outlet of the four-way solenoid valve is connected to the inlet of a series module. The outlets of the parallel and series modules are connected and then pass through the inlet of a second three-way solenoid valve. The first outlet of the second three-way solenoid valve is connected to the inlet of a third three-way solenoid valve. The first outlet of the third three-way solenoid valve is connected to the purified water storage area. The second outlet of the third three-way solenoid valve is connected to the second inlet of the first three-way solenoid valve. The second outlet of the second three-way solenoid valve is connected to the wastewater storage area.

[0052] In one implementation, each CDI module in the series module corresponds to a power supply.

[0053] In one implementation, before collecting the conductivity of the pretreated water, the raw water is filtered through a filter to remove large solids that cannot pass through the filter. The filtered raw water is then fed into a working pump, which accelerates the filtered water at an initial power to obtain pretreated water. The initial power is determined by a technician.

[0054] In one implementation, the operating mode (parallel or series) of the water purification modules is determined based on the first conductivity to ensure that the purification process can specifically address different water quality conditions. By determining the applied voltage of each CDI module, the system can precisely adjust the purification effect to ensure that the conductivity of the target purified water reaches the preset target conductivity and meets the minimum standard.

[0055] In one implementation, precise control of the voltage applied to each CDI module avoids over- or under-treatment of the pretreated water, thereby improving purification efficiency.

[0056] In one implementation, the minimum standard is the minimum water quality requirement that the target purified water must meet before entering the purified water storage area, and this minimum water quality requirement is determined by technical personnel.

[0057] In one embodiment, determining the operating mode of the water purification module based on the first conductivity includes:

[0058] If the first conductivity is greater than the first preset conductivity, then the series mode is recorded as the working mode of the water purification module, and the pretreated water only passes through the series module;

[0059] If the first conductivity is less than the second preset conductivity, then the parallel mode is recorded as the working mode of the water purification module, and the pretreated water only passes through the parallel module;

[0060] If the first conductivity is less than the first preset conductivity but greater than the second preset conductivity, then the mixed mode is recorded as the working mode of the water purification module, and the pretreated water passes through both the parallel module and the series module simultaneously.

[0061] In one implementation, the first preset conductivity and the second preset conductivity are determined by a technician.

[0062] In one implementation, when the first conductivity of the pretreated water is greater than the first preset conductivity, it indicates that the water quality is very poor. Neither the parallel mode nor the mixed mode can purify the pretreated water into qualified water (meeting the minimum usage standards). Therefore, the series mode is selected, and the pretreated water only passes through the series modules. In the series mode, multiple CDI modules are connected in sequence, and each module will further purify the water quality, thereby achieving a better removal effect.

[0063] In one implementation, when the first conductivity of the pretreated water is less than the second preset conductivity, it indicates that the water quality is relatively good. Only one CDI module is needed to purify the pretreated water into qualified water. Therefore, the parallel mode is selected, and the pretreated water only passes through the parallel module. In the parallel mode, multiple CDI modules work at the same time, which can handle a larger water flow, so there will be no over-treatment of water.

[0064] In one implementation, when the first conductivity of the pretreated water is between the first preset conductivity and the second preset conductivity, it indicates that the water quality is at a relatively moderate level. At this time, a single CDI module cannot purify the pretreated water into qualified water, but the concentration of the purified water is slightly higher than the minimum usage standard. In this case, it can be diluted with water of qualified concentration to make the mixed water qualified. Therefore, a mixing mode is selected, in which the pretreated water passes through both parallel and series modules. In this mode, part of the water is quickly treated through the parallel module, and part of the water is deeply purified through the series module. The qualified water from the series module is used to dilute the water from the parallel module so that the mixed water meets the minimum usage standard.

[0065] In one embodiment, the applied voltage of each CDI module in the series module

[0066] Through formula Sure;

[0067] Where V0 is the initial voltage of all CDI modules, f(x) is the coefficient equation of the initial voltage, k is the proportionality constant, and l in l is the first conductivity. out Let be the target conductivity, e be the natural constant, α be the adsorption influence factor, t be the current module's running time, Q1 be the rate at which pretreated water passes through the series module, n be the number of CDI modules connected in series, x be the Xth CDI module in the series module from the direction of pretreated water inflow, and V be the current value. x The applied voltage for the Xth CDI module.

[0068] In one implementation, the initial voltage is the minimum applied voltage determined by the CDI module in the laboratory when the pretreated water is filtered into qualified water through a constant voltage series module; the applied voltage of each CDI module in the constant voltage series module is the same, and the initial voltage range is between 0.8V and 1.3V.

[0069] In one implementation, the module's runtime is reset during positive / negative voltage switching; the rate at which pretreated water passes through the series modules is determined by the operating pump; and the adsorption influencing factor is determined in the laboratory for a CD1 module using a formula. Determine the adsorption influencing factor, where α is the adsorption influencing factor, t0 is the running time of the CDI module, and q eThis refers to the amount of adsorption that the CDI module reaches when it reaches adsorption equilibrium. Let be the cumulative adsorption amount of the CDI module at time t0; the proportionality constant K is , and in the laboratory, with an applied voltage of 1.1V, the conductivity of the wastewater before passing through the CDI module is measured under different electrode materials and recorded as the first conductivity, and the conductivity of the wastewater after passing through the CDI module is recorded as the second conductivity, using the formula:

[0070]

[0071] The proportionality constant k corresponding to the CDI module under different electrode materials was obtained. The electrode materials can be activated carbon, graphene, carbon nanotubes, etc., and the proportionality constants of activated carbon, graphene, and carbon nanotubes are 1.087, 1.186, and 1.134, respectively.

[0072] In one implementation, by dynamically adjusting the applied voltage of each CDI module, it can be ensured that each module operates in its optimal working state, thereby maximizing the performance of the entire series module.

[0073] In one implementation, the sum of the voltages applied to each CDI module in the series connection is greater than the initial voltage. Taking three CDI modules in series as an example, the applied voltage to the first CDI module is:

[0074]

[0075] The applied voltage for the second CDI module is:

[0076] The applied voltage for the third CDI module is:

[0077]

[0078] The voltage of the series modules increases sequentially from the second outlet of the four-way solenoid valve to the inlet of the second and third-way solenoid valves. This allows each module to operate under different voltage conditions. This segmented treatment method helps to gradually remove ions from the water at each stage, thereby improving the overall deionization efficiency. It also avoids the situation where if the voltage of the CDI module near the second outlet of the four-way solenoid valve is too high, it may cause the module to reach saturation too quickly, reducing its adsorption capacity and causing the efficiency of the entire series module to decrease. By gradually increasing the voltage, the workload of each module can be balanced, extending the effective working time of the entire system. Furthermore, by gradually increasing the voltage, the water after passing through the series modules will definitely meet the minimum usage standards.

[0079] In one embodiment, the applied voltage of each CDI module in the parallel module is:

[0080] Through formula Sure;

[0081] Where V0 is the initial voltage of all CDI modules, k is the proportionality constant, and l in l is the first conductivity. out Let e ​​be the target conductivity, α be the natural constant, α be the adsorption influence factor, t be the current module's running time, Q2 be the rate at which pretreated water passes through the parallel modules, and V be the voltage. x The applied voltage for the Xth CDI module.

[0082] In one implementation, each CDI module in the parallel module is subjected to the same voltage, and multiple CDI modules work simultaneously, which can handle a larger water flow rate, thus preventing over-treatment of water.

[0083] In one embodiment, in series mode, adjusting the applied voltage of each CDI module based on a second conductivity and a target conductivity, and determining whether the target purified water is qualified includes:

[0084] If the second conductivity is less than the target conductivity, and the second conductivity is within the preset conductivity range, then the target purified water will be transported to the purified water storage area.

[0085] If the second conductivity is less than the target conductivity and the second conductivity is not within the preset conductivity range, then the initial voltage of each CDI module is adjusted according to the first preset step size, and the target purified water is transported to the purified water storage location.

[0086] In one implementation, the preset conductivity range is determined by technical personnel to meet the minimum usage standards.

[0087] In one implementation, the first preset step size is determined by a technician.

[0088] In one implementation, when the second conductivity is within a preset conductivity range, it indicates that the conductivity of the purified water is within the ideal range. At this time, storing the purified water can ensure that the water quality meets the usage requirements. If the second conductivity is not within the preset conductivity range but is less than the target conductivity, it indicates that the pretreated water has been over-purified. At this time, the initial voltage of each CDI module can be reduced to avoid energy loss caused by over-purification.

[0089] In one embodiment, in parallel or hybrid mode, adjusting the applied voltage of each CDI module based on a second conductivity and a target conductivity, and determining whether the target purified water is qualified, includes:

[0090] If the second conductivity is less than the target conductivity, the target purified water will be transported to the purified water storage area.

[0091] If the second conductivity is greater than the target conductivity, the initial voltage of each CDI module is adjusted according to the second preset step size, and the target purified water is transported to the parallel module.

[0092] In one implementation, the second preset step size is determined by a technician.

[0093] In one implementation, the second preset step size in the hybrid mode is smaller than the second preset step size in the parallel mode.

[0094] In one implementation, when the second conductivity is less than the target conductivity, it indicates that the purified water quality is qualified and the target purified water can be directly transported to the purified water storage location. If the second conductivity is greater than the target conductivity, the initial voltage of each CDI module is increased according to the second preset step size to further reduce the conductivity of the purified water. This adjustment is based on the difference between the actual water quality and the target value, thus it can more effectively improve the water quality qualification rate.

[0095] In one embodiment, the method further includes:

[0096] The total voltage applied to the water purification module is monitored in real time. If the total voltage exceeds the preset voltage and remains above the preset voltage for a first preset time window, a reverse voltage is applied to the water purification module, and the valve for pretreated water to enter the water purification module is closed while the valve for reclaimed water to enter the water purification module is opened. The reverse voltage is the preset voltage.

[0097] After the second preset time window, close the valve for reclaimed water to enter the water purification module and open the valve for pretreated water to enter the water purification module.

[0098] In one implementation, when the operating mode is series mode, the total voltage is the sum of the voltages of all CDI modules; when the operating mode is parallel mode, the total voltage is the voltage of any one CDI module; and when the operating mode is hybrid mode, the total voltage is the sum of the voltages in series mode and parallel mode.

[0099] In one implementation, the adsorption critical voltage of the CDI module is measured in the laboratory. Once the adsorption critical voltage is exceeded, the adsorption effect of the CDI module no longer increases.

[0100] In one implementation, the first preset time window and the second preset time window are determined by technical personnel.

[0101] In one implementation, the reclaimed water contains a certain concentration of electrolyte, which is used to flush away ions previously adsorbed in the CDI module during the reverse operation (or "regeneration" process) of the CDI module, thereby restoring the module's ion adsorption capacity.

[0102] In one implementation, the valve that closes the pretreated water entering the water purification module is the first inlet of the four-way solenoid valve, and the valve that opens the regenerated water entering the water purification module is the second inlet of the four-way solenoid valve.

[0103] In one implementation, the reclaimed water flows into the wastewater storage area through the second outlet of the second three-way valve after passing through the water purification module.

[0104] Based on the same inventive concept, this invention also provides a smart energy-saving water treatment device based on CDI. See also Figure 3 , Figure 3 A schematic diagram of a smart energy-saving water treatment device based on CDI provided in an embodiment of the present invention includes: Module:

[0105] The working mode determination module is used to collect the conductivity of the pretreated water as the first conductivity, and determine the working mode of the water purification module based on the first conductivity. The water purification module includes a parallel module and a series module. The parallel module is formed by M capacitor deionization (CDI) modules connected in parallel. The series module is formed by N CDI modules connected in series. The pretreated water is the water coming out of the working pump.

[0106] A voltage application module is used to determine the applied voltage for each CDI module based on the operating mode, a first conductivity, and a target conductivity; the target conductivity is the conductivity of water when it meets the minimum usage standards.

[0107] The target conductivity module is used to define the pretreated water after passing through the water purification module as the target purified water, and to collect the conductivity of the target purified water as the second conductivity.

[0108] The purified water uses a judgment module to change the applied voltage of each CDI module according to the second conductivity and the target conductivity, and to determine whether the target purified water is qualified.

[0109] Based on the embodiments of the present invention, a smart energy-saving water treatment device based on CDI can quickly determine the water quality by using the first conductivity, thereby selecting an appropriate working mode so that the water purification module can optimize the treatment for specific water quality conditions, thus improving water treatment efficiency; and then dynamically determining the applied voltage of each CDI module according to the second conductivity and the target conductivity, effectively avoiding poor water treatment effect caused by too low voltage and energy waste caused by too high voltage, thereby improving the efficiency of the entire water treatment system.

[0110] The foregoing has provided a detailed description of one embodiment of the present invention, but this description is merely a preferred embodiment and should not be construed as limiting the scope of the invention. All equivalent variations and modifications made within the scope of the claims of this invention should still fall within the patent coverage of this invention.

Claims

1. A CDI-based smart energy-saving water treatment method, characterized in that, The method comprises: Collecting the conductivity of the pretreated water as a first conductivity, determining the working mode of the water purification module according to the first conductivity; the water purification module comprises a parallel module and a series module; the parallel module is formed by M capacitive deionization CDI modules in parallel; the series module is formed by N CDI modules in series, and the applied voltage of the CDI modules in the series module increases in turn from the water inlet to the water outlet; the pretreated water is the water discharged from the working pump; Determine the applied voltage of each CDI module according to the working mode, the first conductivity and the target conductivity; the target conductivity is the conductivity of the water when the minimum use standard is met; The pretreated water after passing through the water purification module is recorded as target purified water, and the conductivity of the target purified water is recorded as a second conductivity; According to the second conductivity and the target conductivity, the applied voltage of each CDI module is changed, and whether the target purified water is qualified is determined; According to the first conductivity, the working mode of the water purification module is determined, which comprises: If the first conductivity is greater than the first preset conductivity, the series mode is recorded as the working mode of the water purification module, and the pretreated water only passes through the series module; If the first conductivity is less than the second preset conductivity, the parallel mode is recorded as the working mode of the water purification module, and the pretreated water only passes through the parallel module; If the first conductivity is less than the first preset conductivity and greater than the second preset conductivity, the mixed mode is recorded as the working mode of the water purification module, and the pretreated water passes through the parallel module and the series module at the same time; In the series mode, according to the second conductivity and the target conductivity, the applied voltage of each CDI module is changed, and whether the target purified water is qualified is determined, which comprises: if the second conductivity is less than the target conductivity, and the second conductivity is in the preset conductivity interval, the target purified water is transported to the purified water storage place; If the second conductivity is less than the target conductivity, and the second conductivity is not in the preset conductivity interval, the initial voltage of each CDI module is adjusted according to the first preset step, and the target purified water is transported to the purified water storage place; In the parallel mode or the mixed mode, according to the second conductivity and the target conductivity, the applied voltage of each CDI module is changed, and whether the target purified water is qualified is determined, which comprises: If the second conductivity is less than the target conductivity, the target purified water is transported to the purified water storage place; If the second conductivity is greater than the target conductivity, the initial voltage of each CDI module is adjusted according to the second preset step, and the target purified water is transported to the parallel module; The applied voltage of each CDI module in the series module determined by the equation determined; wherein, is the initial voltage for all CDI modules, is the coefficient equation for initial voltage, is the proportional constant, is the first conductivity, is the target conductivity, is the natural constant, is the adsorption impact factor, is the running time of the current module, is the rate of the pretreated water passing through the series module, is the number of CDI modules in series of the series module, is the Xth CDI module from the inflow direction of the pretreated water in the series module, is the applied voltage of the Xth CDI module; The adsorption impact factor is determined in the laboratory for a CDI module by the formula determining the adsorption impact factor, for the adsorption impact factor, for the CDI module run time, for the adsorption capacity of the CDI module at adsorption equilibrium, for the cumulative adsorption of the CDI module at time t.

2. A CDI based smart energy saving water treatment method as claimed in claim 1 wherein, The applied voltage of each CDI module in the parallel module: determined by the formula determined; wherein, is the initial voltage for all CDI modules, is a proportional constant, is the first conductivity, is the target conductivity, is a natural constant, is an adsorption impact factor, is the runtime of the current module, is the rate of the pretreated water through the parallel modules, is the applied voltage of the Xth CDI module.

3. The CDI-based smart energy saving water treatment method according to claim 1, wherein, The method further comprises: Real-time detection of the total voltage applied to the water purification module, if the total voltage exceeds the preset voltage, and the total voltage is always greater than the preset voltage in the first preset time window, the reverse voltage is applied to the water purification module, and the valve of the pretreated water into the water purification module is closed, and the valve of the regenerated water into the water purification module is opened; the reverse voltage is the preset voltage; After the second preset time window, the valve of the regenerated water into the water purification module is closed, and the valve of the pretreated water into the water purification module is opened.

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