Wastewater treatment method and system, water purifier, storage medium and computer program product

Abstract

The invention relates to the technical field of automation, and provides a wastewater treatment method and system, a water purifier, a storage medium and a computer program product.The method comprises the steps that after an electrode in a capacitive deionization water purification system is cleaned, an electrolysis unit in the capacitive deionization water purification system is controlled to operate, the electrolyzer is used for electrolyzing wastewater generated by cleaning the electrode to generate a disinfectant; the disinfectant comprises hypochlorous acid generated by electrolyzing chloride ions in the wastewater. After the electrode in the capacitive deionization water purification system is cleaned, the operation of the electrolysis unit in the capacitive deionization water purification system is controlled, chloride ions in wastewater generated by cleaning the electrode are electrolyzed to generate hypochlorous acid, and the disinfectant is further generated. Compared with direct discharge of the wastewater, the method has the advantages that the wastewater generated by cleaning the electrode can be utilized by electrolyzing the wastewater and generating the useful disinfectant, so that the water resource utilization rate of the water purification system is improved.

Description

Technical Field

[0001] The present application relates to the field of automation technology, and in particular to a wastewater treatment method, system, water purifier, storage medium and computer program product. Background Art

[0002] With the continuous improvement of living standards, people's requirements for water are getting higher and higher. Currently, capacitive deionization (CDI) technology can be used to improve water quality. Specifically, a water purification system based on capacitive deionization technology can be used for water purification.

[0003] Traditional household CDI water purification systems are prone to electrode scaling during long-term use, so the electrodes in the CDI water purification system need to be cleaned. However, when cleaning the electrodes in the CDI water purification system, the wastewater generated by the cleaning is directly discharged, resulting in a low water resource utilization rate of the current water purification system. Summary of the invention

[0004] The present application aims to solve at least one of the technical problems existing in the related art. To this end, the present application proposes a wastewater treatment method, which can improve the water resource utilization rate of a water purification system.

[0005] The present application also proposes a water purification system, a water purifier, a storage medium and a computer program product.

[0006] According to the first aspect of the present application, the wastewater treatment method comprises: After cleaning the electrodes in the capacitive deionization water purification system, the electrolysis unit in the capacitive deionization water purification system is controlled to operate so as to generate a disinfectant by electrolyzing the wastewater generated by cleaning the electrodes; the disinfectant includes hypochlorous acid generated by electrolyzing chloride ions in the wastewater.

[0007] According to the wastewater treatment method of the embodiment of the present application, after cleaning the electrodes in the capacitor deionization water purification system, the electrolysis unit in the capacitor deionization water purification system is controlled to operate, thereby generating hypochlorous acid and further generating disinfectant by electrolyzing the chloride ions in the wastewater generated by the clean electrodes. Compared with directly discharging the wastewater, by electrolyzing the wastewater and generating useful disinfectant, the wastewater generated by the clean electrodes can be utilized, thereby improving the water resource utilization rate of the water purification system.

[0008] According to one embodiment of the present application, after controlling the electrolysis unit in the capacitive deionization water purification system to operate, it also includes: Determining the effective chlorine concentration of the disinfectant; It is determined that the difference between the effective chlorine concentration and the preset concentration threshold is greater than the preset difference threshold, and the operating parameters of the electrolysis unit are adjusted.

[0009] According to one embodiment of the present application, the adjusting the operating parameters of the electrolysis unit includes: Determine the difference as the current error, and obtain the historical error; Determine the parameter to be adjusted according to the current error and the historical error in combination with a preset proportional gain coefficient, a preset integral gain coefficient and a preset differential gain coefficient; The operating parameters of the electrolysis unit are adjusted according to the parameters to be adjusted.

[0010] According to an embodiment of the present application, the step of determining the parameter to be adjusted based on the current error and the historical error in combination with a preset proportional gain coefficient, a preset integral gain coefficient, and a preset differential gain coefficient includes: Multiply the current error by the preset proportional gain coefficient to obtain the proportional adjustment parameter; Determine the sum of each error in the historical error and the current error, and multiply the sum by a preset integral gain coefficient to obtain an integral adjustment parameter; Determine the error difference between the current error and the target error in the historical errors, and multiply the error difference by a preset differential gain coefficient to obtain a differential adjustment parameter; the target error is the error with the smallest time difference between the recorded time and the current time in the historical errors; The proportional adjustment parameter, the integral adjustment parameter and the differential adjustment parameter are added together to obtain a parameter to be adjusted.

[0011] According to one embodiment of the present application, before cleaning the electrodes in the capacitive deionization water purification system, the method further includes: Determine the cumulative amount of water purified by the capacitor deionization water purification system between the target time and the current time; the target time is the time when the electrodes in the capacitor deionization water purification system are cleaned for the last time before the current time; wherein, if there is no time when the electrodes in the capacitor deionization water purification system are cleaned, the target time is the time when the capacitor deionization water purification system starts to purify water for the first time; Determine that the accumulated clean water volume is greater than or equal to a preset clean water volume threshold, and execute the step of cleaning the electrodes in the capacitive deionization water purification system.

[0012] According to one embodiment of the present application, the water corresponding to the cumulative amount of clean water is obtained in the following manner: Determining water quality data of an inlet water flow of the capacitive deionization water purification system; Determining target operating parameters of the capacitor deionization water purification system according to the inlet water quality data; The operation of the capacitor deionization water purification system is controlled according to the target operating parameters to process the inlet water flow of the inlet water quality data to the target water quality data.

[0013] The water purification system according to the second aspect of the embodiment of the present application is characterized in that it includes a control system, an electrolysis unit and a computer program stored in the control system, and when the computer program is executed by the control system, it implements any of the wastewater treatment methods described above.

[0014] According to the water purifier of the third aspect of the present application, the water purifier includes a shell, a control system, an electrolysis unit and a computer program stored in the control system, and when the control system executes the computer program, it implements any one of the wastewater treatment methods described above.

[0015] According to the storage medium of the fourth aspect embodiment of the present application, the storage medium is a non-transitory computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, it implements any of the wastewater treatment methods described above.

[0016] A computer program product according to an embodiment of the fifth aspect of the present application includes a computer program, which, when executed by a processor, implements any of the wastewater treatment methods described above.

[0017] The above one or more technical solutions in the embodiments of the present application have at least the following technical effects: After cleaning the electrodes in the capacitor deionization water purification system, the electrolysis unit in the capacitor deionization water purification system is controlled to operate, thereby generating hypochlorous acid and further generating disinfectant by electrolyzing the chloride ions in the wastewater generated by the cleaning electrodes. Compared with directly discharging the wastewater, by electrolyzing the wastewater and generating useful disinfectant, the wastewater generated by the cleaning electrodes can be utilized, thereby improving the water resource utilization rate of the water purification system.

[0018] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1It is a schematic diagram of the process of the wastewater treatment method provided in the embodiment of the present application; Figure 2 It is a schematic diagram of the architecture of the water purification system provided in the embodiment of the present application; Figure 3 It is a schematic diagram of the overall control flow of the water purification system provided in the embodiment of the present application; Figure 4 It is a structural schematic diagram of the water purifier provided in this application. DETAILED DESCRIPTION

[0021] The following is a further detailed description of the implementation of the present application in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present application but cannot be used to limit the scope of the present application.

[0022] In the description of the embodiments of the present application, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the embodiments of the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0023] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0024] In the embodiments of the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0025] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiments of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0026] Figure 1 is a schematic diagram of a wastewater treatment method provided in an embodiment of the present application, such as Figure 1 As shown, the wastewater treatment method comprises: Step 110, after cleaning the electrodes in the capacitor deionization water purification system, control the electrolysis unit in the capacitor deionization water purification system to operate so as to generate a disinfectant by electrolyzing the wastewater generated by cleaning the electrodes; the disinfectant includes hypochlorous acid generated by electrolyzing chloride ions in the wastewater.

[0027] It should be noted that the wastewater treatment method provided in the embodiment of the present application can be applied to a water purification system, which can specifically be a capacitive deionization water purification system, namely a CDI water purification system (hereinafter referred to as a water purification system).

[0028] Figure 2 Schematic diagram of the water purification system provided in the embodiment of the present application. Figure 2 As shown, the capacitive deionization water purification system in the present application may include a raw water inlet, a purified water outlet, a disinfected water outlet, an intelligent control system (hereinafter referred to as a control system), a pre-filter unit, a CDI water purification unit, an electrolysis unit, and a post-filter unit, wherein the control system may be connected to the pre-filter unit, the CDI water purification unit, the electrolysis unit, and the post-filter unit, respectively, thereby controlling the connected components. For example, the connected components may be controlled to operate according to the parameters determined by the control system, respectively, so as to achieve the desired functions.

[0029] The pure water outlet of this application can be made of food-grade 304 stainless steel, with an inner diameter of 6mm (millimeter) and a water flow rate of 1.5L (liter) / min (minute).

[0030] The disinfection water outlet can be made of corrosion-resistant polyvinylidene fluoride (PVDF) material, with an inner diameter of 4mm and a water flow rate of 0.3L / min. The outlet is designed with a special threaded interface to prevent misconnection. Among them, PVDF is a high-performance fluoroplastic.

[0031] In the water purification system of the present application, raw water is input to the pre-filter unit for impurity filtration, the filtered water flows to the CDI water purification unit for water purification, the water after water purification flows to the post-treatment unit for disinfection, and the disinfected water is output as pure water. After cleaning the electrodes in the CDI water purification unit, the generated wastewater flows into the electrolysis unit, the wastewater is electrolyzed by the electrolysis unit, and disinfected water is generated and output.

[0032] It should be noted that the pre-filter unit in the present application may include a polypropylene (PP) cotton filter element and an activated carbon filter element; the CDI water purification unit may include a CDI electrode group, and the CDI electrode group may include multiple electrodes of the same or different polarities, and each electrode may adopt an innovative electrode design and material; the post-filter unit may adopt ultrafiltration membrane technology; the intelligent control system may specifically be based on an ARM Cortex-M4 microcontroller. The ARM Cortex-M4 microcontroller is a 32-bit embedded processor.

[0033] In one embodiment, the electrodes in the CDI water purification unit of the present application can be made of nitrogen-doped graphene with a specific surface area of ​​2300m² (square meters) / g (gram), which greatly improves the ion adsorption efficiency. The electrode structure can use 3D printing technology to make a flow field structure to improve the uniformity of water flow and reduce dead corners. The initial working parameters can be an applied voltage of 1.2V (volts), a current density of 0.8mA (milliamperes) / cm² (square centimeters), and a single water purification cycle of 15 minutes.

[0034] The electrolytic cell can also be provided with titanium-based iridium oxide coating (DSA) electrodes, which have excellent electrocatalytic performance and corrosion resistance. The electrolytic cell design can adopt a parallel plate structure, with an electrode spacing of 2mm and an effective area of ​​200cm². The initial working parameters can be an applied voltage of 3.5V, a current density of 20mA / cm², and an electrolysis time of 5 minutes / batch.

[0035] In one embodiment, the overall size of the water purification system of the present application is 400 mm (length) by 250 mm (width) by 420 mm (height), suitable for installation under a kitchen sink.

[0036] The executor of the wastewater treatment method provided in the present application may be a control system in a water purification system.

[0037] It should be noted that before cleaning the electrodes in the capacitive deionization water purification system, it also includes: Determine the cumulative amount of water purified by the capacitor deionization water purification system between the target time and the current time; the target time is the time when the electrodes in the capacitor deionization water purification system are cleaned for the last time before the current time; if there is no time when the electrodes in the capacitor deionization water purification system are cleaned, the target time is the time when the capacitor deionization water purification system starts to purify water for the first time; Determine that the accumulated clean water volume is greater than or equal to a preset clean water volume threshold, and perform a step of cleaning the electrodes in the capacitive deionization water purification system.

[0038] The water corresponding to the cumulative clean water volume is obtained in the following way: Determine the inlet water quality data of the inlet water flow of the capacitive deionization water purification system; Determine the target operating parameters of the capacitor deionization water purification system based on the inlet water quality data; The operation of the capacitor deionization water purification system is controlled according to the target operating parameters to process the inlet water flow of the inlet water quality data to the target water quality data.

[0039] Specifically, the CDI water purification unit of the water purification system of the present application may also be provided with a water quality detector, which can detect the water quality of the influent water flow after being treated by the pre-filtration unit, obtain the influent water quality data and transmit it to the control system. Among them, the water quality data in the present application may be total dissolved solids (TDS).

[0040] Therefore, the control system can obtain the inlet water quality data of the inlet water flow collected by the water quality detector.

[0041] The present application may set a program in the control system for matching the operating parameters of the capacitor deionization water purification system in the water purification system according to the input water quality data. For example, a matching rule or a matching table may be set. The specific matching process is not limited in the present application and can be set according to the existing technology. Among them, the operating parameters of the above-mentioned capacitor deionization water purification system refer to the operating parameters required to process the inlet water flow of the inlet water quality data to the target water quality data. Among them, the operating parameters of the present application may be one or more combinations of the operating voltage, operating current and operating time of the electrode.

[0042] The present application may also deploy an artificial intelligence model in the control system for predicting the operating parameters of the capacitive deionization water purification system in the water purification system based on the input water quality data. Specifically, the control system may pre-acquire the sample inlet water quality data and the sample operating parameters, and the sample operating parameters represent the operating parameters of the electrodes in the CDI electrode group when the sample inlet water flow is processed from the sample inlet water quality data to the target water quality data. The target water quality data is the water quality data set according to the actual water use standard or other requirements.

[0043] Furthermore, multiple sample inlet water quality data and sample operating parameters are used as training data, and the artificial intelligence model constructed according to the scenario of the present application is trained based on the training data. After completing the model training, a target prediction model is obtained that can predict the operating parameters of the water purification system electrodes based on the input water quality data.

[0044] It should be noted that the present application does not specifically limit the modeling process and model parameters. A new model can be constructed and new parameters can be set, or an existing model and its parameters can be used.

[0045] Therefore, after receiving the inlet water quality data of the inlet water flow, the control system of the present application can determine the operating parameters of the electrodes in the water purification system according to the inlet water quality data through the program or artificial intelligence model therein and use them as the target operating parameters.

[0046] After obtaining the target operating parameters of the electrodes in the capacitive deionization water purification system, the control system can control the electrodes in the CDI electrode group to operate according to the target operating parameters, thereby purifying the inlet water flow through the electrodes in the CDI electrode group to process the inlet water flow from inlet water quality data to target water quality data.

[0047] It should be further explained that after controlling the operation of the capacitor deionization water purification system according to the target operating parameters, it also includes: Determine the effluent water quality data of the effluent stream after water purification treatment; Determine that the difference between the target water quality data and the outlet water quality data is greater than a preset threshold, and adjust the operating parameters of the capacitive deionization water purification system.

[0048] Specifically, a water quality detector may also be provided at the water outlet of the CDI water purification unit of the present application, which can detect the water quality of the effluent water flow after water purification treatment, obtain the effluent water quality data and transmit it to the control system.

[0049] Therefore, the control system can obtain the effluent water quality data of the effluent water flow after the water purification treatment.

[0050] Furthermore, in the present application, the control system can obtain water quality data pre-set by the user based on actual needs as target water quality data, and the target water quality data is the water quality data that the user expects to achieve after water purification treatment.

[0051] Furthermore, the control system may perform a difference operation between the target water quality data and the outlet water quality data, and compare the obtained difference with a threshold value pre-set according to actual needs, thereby determining the size relationship between the difference and the preset threshold value.

[0052] Furthermore, if it is determined that the difference is greater than the preset threshold, it can be considered that there is a large difference between the outlet water quality data and the target water quality data, that is, the water quality of the outlet water flow after water purification cannot meet the user's expected water quality. Therefore, the control system can determine that the operating parameters of the electrodes in the CDI electrode group need to be adjusted.

[0053] Specifically, the present application can adjust the operating parameters of the electrodes in the CDI electrode group through the PID algorithm, where PID is the abbreviation of Proportional, Integral, and Differential.

[0054] Furthermore, the operating parameters of the capacitive deionization water purification system are adjusted, including: The difference is determined as the current error, and the historical error is obtained; According to the current error and the historical error, the parameter to be adjusted is determined in combination with the preset proportional gain coefficient, the preset integral gain coefficient and the preset differential gain coefficient; Adjust the operating parameters of the capacitor deionization water purification system according to the parameters to be adjusted.

[0055] Further, according to the current error and the historical error, the parameters to be adjusted are determined in combination with the preset proportional gain coefficient, the preset integral gain coefficient and the preset differential gain coefficient, including: Multiply the current error by the preset proportional gain coefficient to obtain the proportional adjustment parameter; Determine the sum of each error in the historical error and the current error, multiply the sum by a preset integral gain coefficient, and obtain an integral adjustment parameter; Determine the error difference between the current error and the target error in the historical error, multiply the error difference by the preset differential gain coefficient to obtain the differential adjustment parameter; the target error is the error with the smallest time difference between the recorded time and the current time in the historical error; The proportional adjustment parameter, the integral adjustment parameter and the differential adjustment parameter are added together to obtain the parameter to be adjusted.

[0056] Specifically, when adjusting the operating parameters of the capacitor deionization water purification system, the control system can determine the difference between the target water quality data and the outlet water quality data as the current error, and obtain the historical errors recorded in the historical operation of the water purification system from the storage information. The historical errors can include multiple specific errors and the recording time of each error.

[0057] Furthermore, the proportional gain coefficient, the integral gain coefficient and the differential gain coefficient set in advance according to the actual demand can be set in advance according to the actual demand. The proportional gain coefficient, the integral gain coefficient and the differential gain coefficient set in advance according to the actual demand can also be respectively referred to as proportional constants, integral constants and differential constants, and different values ​​can be set for different control objects. For example, a set of proportional constants, integral constants and differential constants can be set for voltage operating parameters, and another set of proportional constants, integral constants and differential constants can be set for current operating parameters.

[0058] Furthermore, the current error may be multiplied by a preset proportional gain coefficient, and the product may be used as a proportional adjustment parameter.

[0059] And, the sum of each error in the historical error and the current error is calculated, the sum is multiplied by a preset integral gain coefficient, and the product is used as an integral adjustment parameter.

[0060] And, determine the error with the smallest time difference between the recorded time and the current time in the historical errors and use it as the target error, further calculate the error difference between the current error and the target error in the historical errors, multiply the error difference by the preset differential gain coefficient, and use the product as the differential adjustment parameter.

[0061] The proportional adjustment parameter, the integral adjustment parameter and the differential adjustment parameter are summed, and the result of the summation is used as the parameter to be adjusted.

[0062] Furthermore, the operating parameters of the capacitive deionization water purification system can be updated according to the parameters to be adjusted, and specifically, parameter compensation can be performed to achieve adjustment of the operating parameters.

[0063] For example, if the operating parameter is the operating voltage, the operating voltage of the electrodes in the CDI electrode group of the capacitive deionization water purification system is compensated for the above-determined new operating voltage on the basis of the original operating voltage to obtain a new operating voltage.

[0064] It is understandable that the electrodes in the CDI electrode group of the water purification system will absorb ions in the water during the water purification process, thereby achieving the purpose of water purification. However, during the water purification process, the electrodes will scale, and scaling will reduce the water purification ability of the electrodes. At this time, the electrodes need to be cleaned to restore the water purification ability of the electrodes. The cumulative water purification volume has a great relationship with the scaling of the electrodes. The greater the cumulative water purification volume, the easier it is for the electrodes to scale or the more scaling there is.

[0065] Therefore, a flow meter may also be provided at the pure water outlet of the water purification system of the present application, so as to monitor the water output of the water purification system in real time. It should also be noted that the present application starts to count the cumulative water output when the capacitor deionization water purification system starts to purify water for the first time, resets the current cumulative water output to zero each time the electrodes in the capacitor deionization water purification system are cleaned, and restarts to count the cumulative water output after each cleaning of the electrodes in the capacitor deionization water purification system is completed. Therefore, the moment at that time can be recorded each time the electrodes in the capacitor deionization water purification system are cleaned. The flow meter can transmit the information of the cumulative water output to the control system.

[0066] Based on this, in the process of water purification based on the capacitor deionization water purification system, if the electrodes in the capacitor deionization water purification system have not been cleaned at present, the cumulative amount of clean water between the start of water purification when the capacitor deionization water purification system first performs water purification and the current moment is obtained. If the electrodes in the capacitor deionization water purification system have been cleaned, the cumulative amount of clean water between the last time the electrodes in the capacitor deionization water purification system were cleaned before the current moment and the current moment is obtained.

[0067] Furthermore, the present application may also pre-set a clean water volume threshold based on experience or other methods (such as artificial intelligence). When the cumulative clean water volume of the water purification system reaches the clean water volume threshold, it can be considered that the electrode needs to be cleaned.

[0068] Therefore, after obtaining the current cumulative clean water volume, the control system can compare the cumulative clean water volume with the preset clean water volume threshold, thereby determining the size relationship between the cumulative clean water volume and the preset clean water volume threshold.

[0069] Furthermore, if it is determined that the cumulative amount of purified water is greater than or equal to a preset purified water threshold, it is considered that the electrodes in the capacitive deionization water purification system have been scaled and affected its water purification capacity, so it can be determined to clean the electrodes in the capacitive deionization water purification system.

[0070] In another embodiment, the control system of the present application may also perform a backwash on the electrodes in the CDI water purification unit after the CDI water purification unit runs for every 100 hours to remove the deposits on the electrodes.

[0071] Specifically, the control system of the present application can control the closure of the clean water outlet in the CDI water purification unit, and further control each electrode in the CDI electrode group to operate according to the reverse current, so that each electrode operates according to the reverse polarity of the current polarity. Based on the principle opposite to the adsorption of ions by the electrode, when the electrode operates in reverse polarity, the ions adsorbed on the electrode will be desorbed. Furthermore, the control system can also control the flushing control valve of the flushing structure to open, and flush the electrode through the flushing structure, so as to flush away the ions that have been desorbed from the electrode, and achieve the cleaning of the electrode. In some scenarios, a cleaning agent can also be injected into the cavity or channel where the electrode is located to chemically clean the electrode. Thus, after the cleaning of the electrode is completed, concentrated wastewater is formed and the wastewater outlet of the CDI water purification unit can be controlled to open, so that the wastewater can flow into the cavity or channel where the electrolysis unit is located.

[0072] Furthermore, the control system can control the electrodes in the electrolysis unit to operate according to pre-set working parameters, thereby electrolyzing the wastewater, generating hypochlorous acid by electrolyzing the chloride ions in the wastewater, and evenly mixing the wastewater containing hypochlorous acid to obtain a disinfectant, which can flow out of the disinfectant outlet to the disinfectant tank for storage. It should be noted that in the process of electrolyzing the wastewater in this application, the electrolysis reaction principle is as follows: Anode: 2Cl - →Cl2+2e - ; Cathode: 2H2O+2e - →H2+2OH - ; Overall reaction: Cl2+H2O→HClO+HCl; The hypochlorous acid (HClO) produced is the main disinfectant component.

[0073] According to the wastewater treatment method of the embodiment of the present application, after cleaning the electrodes in the capacitor deionization water purification system, the electrolysis unit in the capacitor deionization water purification system is controlled to operate, thereby generating hypochlorous acid and further generating disinfectant by electrolyzing the chloride ions in the wastewater generated by the clean electrodes. Compared with directly discharging the wastewater, by electrolyzing the wastewater and generating useful disinfectant, the wastewater generated by the clean electrodes can be utilized, thereby improving the water resource utilization rate of the water purification system.

[0074] This application can also integrate a WiFi module (ESP8266), allowing users to view system status and water quality information in real time through mobile phone software.

[0075] Based on the above embodiment, after step 110, the following may be included: Determine the effective chlorine concentration of the disinfectant solution; It is determined that the difference between the effective chlorine concentration and the preset concentration threshold is greater than the preset difference threshold, and the operating parameters of the electrolysis unit are adjusted.

[0076] It should be noted that an electrochemical chlorine meter may also be provided in the disinfectant water storage tank of the present application, and the effective chlorine concentration of the disinfectant may be detected by controlling the electrochemical chlorine meter and transmitted to the control system.

[0077] Therefore, the control system can obtain the effective chlorine concentration of the disinfectant detected by the electrochemical chlorine meter.

[0078] Furthermore, the control system may perform a difference operation between the effective chlorine concentration and a preset concentration threshold, and compare the calculated difference with the preset difference threshold, thereby determining the size relationship between the difference and the preset difference threshold.

[0079] Furthermore, if it is determined that the difference is greater than the preset difference threshold, it means that the effective chlorine concentration of the disinfectant produced by electrolysis does not meet the standard, and therefore it is necessary to adjust the operating parameters of the electrolysis unit so that the effective chlorine concentration of the disinfectant produced subsequently can meet the standard.

[0080] Specifically, the present application can adjust the operating parameters of the electrolysis unit through a PID algorithm.

[0081] The present application adjusts the operating parameters of the electrodes in the electrolysis unit when the disinfectant concentration does not meet the standard, thereby improving the electrolysis efficiency of the electrolysis unit and further improving the water resource utilization rate of the water purification system.

[0082] Furthermore, the operating parameters of the electrolysis unit are adjusted, including: The difference is determined as the current error, and the historical error is obtained; According to the current error and the historical error, the parameter to be adjusted is determined in combination with the preset proportional gain coefficient, the preset integral gain coefficient and the preset differential gain coefficient; The operating parameters of the electrolysis unit are adjusted according to the parameters to be adjusted.

[0083] Further, according to the current error and the historical error, the parameters to be adjusted are determined in combination with the preset proportional gain coefficient, the preset integral gain coefficient and the preset differential gain coefficient, including: Multiply the current error by the preset proportional gain coefficient to obtain the proportional adjustment parameter; Determine the sum of each error in the historical error and the current error, multiply the sum by a preset integral gain coefficient, and obtain an integral adjustment parameter; Determine the error difference between the current error and the target error in the historical error, multiply the error difference by the preset differential gain coefficient to obtain the differential adjustment parameter; the target error is the error with the smallest time difference between the recorded time and the current time in the historical error; The proportional adjustment parameter, the integral adjustment parameter and the differential adjustment parameter are added together to obtain the parameter to be adjusted.

[0084] Specifically, when the operating parameters of the electrodes in the electrolysis unit are adjusted, the control system can determine the above-determined difference as the current error, and simultaneously obtain the historical errors recorded in the historical operation of the water purification system from the stored information. The historical errors can include multiple specific errors and the recording time of each error.

[0085] Furthermore, the proportional gain coefficient, the integral gain coefficient and the differential gain coefficient set in advance according to the actual demand can be set in advance according to the actual demand. The proportional gain coefficient, the integral gain coefficient and the differential gain coefficient set in advance according to the actual demand can also be respectively referred to as proportional constant, integral constant and differential constant, and different values ​​can be set for different control objects. For example, a set of proportional constants, integral constants and differential constants can be set for parameters such as operating time, and another set of proportional constants, integral constants and differential constants can be set for parameters such as operating voltage.

[0086] Furthermore, the current error may be multiplied by a preset proportional gain coefficient, and the product may be used as a proportional adjustment parameter.

[0087] And, the sum of each error in the historical error and the current error is calculated, the sum is multiplied by a preset integral gain coefficient, and the product is used as an integral adjustment parameter.

[0088] And, determine the error with the smallest time difference between the recorded time and the current time in the historical errors and use it as the target error, further calculate the error difference between the current error and the target error in the historical errors, multiply the error difference by the preset differential gain coefficient, and use the product as the differential adjustment parameter.

[0089] The proportional adjustment parameter, the integral adjustment parameter and the differential adjustment parameter are summed, and the result of the summation is used as the parameter to be adjusted.

[0090] Furthermore, the operating parameters of the electrodes in the electrolysis unit may be updated according to the parameters to be adjusted, and specifically, parameter compensation may be performed, thereby achieving adjustment of the operating parameters.

[0091] For example, if the operating parameter is the operating time, the operating time of the electrodes in the electrolysis unit is compensated by the above-determined new operating time on the basis of the original operating time to obtain a new operating time.

[0092] The present application improves the electrolysis efficiency of the electrolysis unit by adjusting the operating parameters of the electrodes in the electrolysis unit when the disinfectant concentration does not meet the standard, thereby improving the water resource utilization rate of the water purification system.

[0093] Figure 3 is a schematic diagram of the overall control flow of the water purification system provided in the embodiment of the present application, such as Figure 3 As shown, in one embodiment, after the raw water (TDS is about 350ppm) is input, it can be mechanically filtered through the pre-filter unit to remove particulate matter larger than 5μm. Activated carbon adsorption is further performed through the pre-filter unit to remove residual chlorine and organic matter in the water. Furthermore, capacitive deionization (CDI) is performed through the CDI water purification unit to remove ions in the water (at a DC voltage of 1.2V, more than 90% of the ions are adsorbed to the electrode surface). Finally, ultrafiltration treatment is performed through the post-filter unit to remove bacteria and viruses with a pore size of 0.01μm, thereby obtaining pure water (TDS is reduced to 30-50ppm) and outputting it (flow rate is 1.5L / min.).

[0094] When the electrodes of the CDI water purification unit are cleaned, waste water (TDS about 1500 ppm) is generated.

[0095] The adsorption stage (12 minutes) of this application can remove more than 90% of the ions.

[0096] The regeneration phase (3 minutes) releases the adsorbed ions by reversing the electrode polarity to form concentrated wastewater.

[0097] Furthermore, the wastewater can be subjected to the following electrolysis process: The wastewater is electrolyzed to produce hypochlorous acid, and the wastewater containing hypochlorous acid is mixed and balanced to obtain disinfected water and output it. Specifically, a voltage of 3.5V and a current density of 20mA / cm² can be applied to the electrodes in the electrolysis unit. The generated disinfected water (effective chlorine concentration 300ppm) is output from a dedicated outlet with a flow rate of 0.3L / min.

[0098] It should be noted that the control system in the present application can also perform data processing on the capacitive deionization and electrolysis processes. Specifically, it can adjust the voltage of the electrodes in the capacitive deionization process according to the results of TDS monitoring, and it can also perform flow control. It can also adjust the operating time of the electrodes of the electrolysis unit according to the concentration of the disinfectant water generated by the electrolysis process.

[0099] Thus, CDI wastewater can be converted into useful disinfectant water through the electrolysis process.

[0100] The water resource utilization rate of this application is effectively improved: the overall water utilization rate of the system reaches more than 95%, which is 10-15 percentage points higher than the traditional CDI system.

[0101] Diversified functions: In addition to providing drinking water with TDS < 50ppm, it can also provide disinfected water with an effective chlorine concentration of 300ppm to meet the diverse water needs of households.

[0102] The present application also provides a water purification system, including a control system, an electrolysis unit, and a computer program stored in the control system, wherein the computer program performs the following method when executed by the control system: After cleaning the electrodes in the capacitive deionization water purification system, the electrolysis unit in the capacitive deionization water purification system is controlled to operate so as to generate a disinfectant by electrolyzing the wastewater generated by cleaning the electrodes; the disinfectant includes hypochlorous acid generated by electrolyzing chloride ions in the wastewater.

[0103] Figure 4 The following is an example of a schematic diagram of the physical structure of a water purifier: Figure 4 As shown, the electronic device may include: a housing, a control system and an electrolysis unit, wherein the control system includes a processor 410, a communication interface 420, a memory 430 and a communication bus 440, wherein the processor 410, the communication interface 420 and the memory 430 communicate with each other through the communication bus 440. The processor 410 may call the logic instructions in the memory 430 to execute the following method: after cleaning the electrodes in the capacitor deionization water purification system, the electrolysis unit in the capacitor deionization water purification system is controlled to operate so as to generate a disinfectant by electrolyzing the wastewater generated by cleaning the electrodes; the disinfectant includes hypochlorous acid generated by electrolyzing chloride ions in the wastewater.

[0104] In addition, the logic instructions in the above-mentioned memory 430 can be implemented in the form of a software functional unit and can be stored in a computer-readable storage medium when it is sold or used as an independent product. Based on this understanding, the technical solution of the present application can be essentially or partly embodied in the form of a software product that contributes to the relevant technology. The computer software product is stored in a storage medium, including several instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc. Various media that can store program codes.

[0105] On the other hand, an embodiment of the present application also provides a non-transitory computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, it is implemented to execute the methods provided in the above embodiments, for example, including: after cleaning the electrodes in the capacitive deionization water purification system, controlling the electrolysis unit in the capacitive deionization water purification system to operate so as to generate a disinfectant by electrolyzing the wastewater generated by cleaning the electrodes; the disinfectant includes hypochlorous acid generated by electrolyzing chloride ions in the wastewater.

[0106] On the other hand, an embodiment of the present application also provides a computer program product having a computer program stored thereon, which, when executed by a processor, is implemented to execute the methods provided in the above embodiments, for example, including: after cleaning the electrodes in the capacitive deionization water purification system, controlling the operation of the electrolysis unit in the capacitive deionization water purification system to generate a disinfectant by electrolyzing the wastewater generated by cleaning the electrodes; the disinfectant includes hypochlorous acid generated by electrolyzing chloride ions in the wastewater.

[0107] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.

[0108] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the relevant technology can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiment.

[0109] Finally, it should be noted that the above implementation modes are only used to illustrate the present application, rather than to limit the present application. Although the present application is described in detail with reference to the embodiments, a person skilled in the art should understand that various combinations, modifications or equivalent substitutions of the technical solutions of the present application do not depart from the spirit and scope of the technical solutions of the present application.

Claims

1. A wastewater treatment method, characterized in that: include: After cleaning the electrodes in the capacitive deionization water purification system, the electrolysis unit in the capacitive deionization water purification system is controlled to operate so as to generate a disinfectant by electrolyzing the wastewater generated by cleaning the electrodes; the disinfectant includes hypochlorous acid generated by electrolyzing chloride ions in the wastewater.

2. The wastewater treatment method according to claim 1, characterized in that: After controlling the electrolysis unit in the capacitive deionization water purification system to operate, the method further includes: Determining the effective chlorine concentration of the disinfectant; It is determined that the difference between the effective chlorine concentration and the preset concentration threshold is greater than the preset difference threshold, and the operating parameters of the electrolysis unit are adjusted.

3. The wastewater treatment method according to claim 2, characterized in that: The adjusting of the operating parameters of the electrolysis unit comprises: Determine the difference as the current error, and obtain the historical error; Determine the parameter to be adjusted according to the current error and the historical error in combination with a preset proportional gain coefficient, a preset integral gain coefficient and a preset differential gain coefficient; The operating parameters of the electrolysis unit are adjusted according to the parameters to be adjusted.

4. The wastewater treatment method according to claim 3, characterized in that: The step of determining the parameter to be adjusted according to the current error and the historical error in combination with a preset proportional gain coefficient, a preset integral gain coefficient and a preset differential gain coefficient includes: Multiply the current error by the preset proportional gain coefficient to obtain the proportional adjustment parameter; Determine the sum of each error in the historical error and the current error, and multiply the sum by a preset integral gain coefficient to obtain an integral adjustment parameter; Determine the error difference between the current error and the target error in the historical errors, and multiply the error difference by a preset differential gain coefficient to obtain a differential adjustment parameter; the target error is the error with the smallest time difference between the recorded time and the current time in the historical errors; The proportional adjustment parameter, the integral adjustment parameter and the differential adjustment parameter are added together to obtain a parameter to be adjusted.

5. The wastewater treatment method according to any one of claims 1 to 4, characterized in that: Before cleaning the electrodes in the capacitive deionization water purification system, it also includes: Determine the cumulative amount of water purified by the capacitor deionization water purification system between the target time and the current time; the target time is the time when the electrodes in the capacitor deionization water purification system are cleaned for the last time before the current time; wherein, if there is no time when the electrodes in the capacitor deionization water purification system are cleaned, the target time is the time when the capacitor deionization water purification system starts to purify water for the first time; Determine that the accumulated clean water volume is greater than or equal to a preset clean water volume threshold, and execute the step of cleaning the electrodes in the capacitive deionization water purification system.

6. The wastewater treatment method according to claim 5, characterized in that: The water corresponding to the cumulative amount of purified water is obtained in the following manner: Determining water quality data of an inlet water flow of the capacitive deionization water purification system; Determining target operating parameters of the capacitor deionization water purification system according to the inlet water quality data; The operation of the capacitor deionization water purification system is controlled according to the target operating parameters to process the inlet water flow of the inlet water quality data to the target water quality data.

7. A water purification system, characterized in that: The invention comprises a control system, an electrolysis unit and a computer program stored in the control system, wherein when the computer program is executed by the control system, the wastewater treatment method according to any one of claims 1 to 6 is implemented.

8. A water purifier, comprising a housing, a control system, an electrolysis unit and a computer program stored in the control system, characterized in that: When the control system executes the computer program, the wastewater treatment method according to any one of claims 1 to 6 is implemented.

9. A storage medium, the storage medium being a non-transitory computer-readable storage medium, on which a computer program is stored, characterized in that: When the computer program is executed by a processor, the wastewater treatment method as described in any one of claims 1 to 6 is implemented.

10. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the wastewater treatment method according to any one of claims 1 to 6 is implemented.

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