High-salinity wastewater treatment system

Abstract

This invention provides a high-salinity wastewater treatment system, comprising a wastewater treatment device, which includes a wastewater impurity removal device, a wastewater concentration device, and an electrolytic chlorination device. The wastewater impurity removal device includes a high-salinity wastewater collection and aeration tank and an ultrafiltration membrane filtration system. The wastewater concentration device includes a weak acid cation exchanger, a high-pressure reverse osmosis device, a high-pressure nanofiltration membrane treatment device, and a stacked-plate reverse osmosis device. The high-salinity wastewater collection and aeration tank, the ultrafiltration membrane filtration system, the weak acid cation exchanger, the high-pressure reverse osmosis device, the high-pressure nanofiltration membrane treatment device, the stacked-plate reverse osmosis device, and the electrolytic chlorination device are sequentially connected. This invention utilizes a salt-separating membrane to separate different substances in high-salinity wastewater. After concentration, the high-salinity wastewater is electrolyzed using electrolytic chlorination technology, truly realizing the resource utilization of various substances in the high-salinity wastewater without generating secondary pollution.

Description

Technical Field

[0001] This invention relates to the field of high-salinity wastewater treatment technology, and in particular to a high-salinity wastewater treatment system. Background Technology

[0002] Currently, industries such as power, steel, coal chemical, and pharmaceutical in my country consume a large amount of freshwater resources during production operations. Although policies require wastewater treatment and reuse, the salt content in the wastewater accumulates with repeated reuse, resulting in high-salt wastewater. Once the salt content of the wastewater reaches a certain level, it can only be discharged or treated.

[0003] The treatment of high-salinity wastewater has always been a challenge. Typical municipal wastewater treatment plants cannot handle wastewater with high salinity, and direct discharge into water bodies causes significant environmental pollution. Establishing a separate high-salinity wastewater treatment plant presents two main problems: firstly, high construction and operating costs; and secondly, the separation of residual salts becomes another difficult problem to handle.

[0004] Meanwhile, there are no readily available standards or standardized systems for zero-discharge of high-salinity wastewater, and most of the technologies used are still in the experimental or non-standardized stages. High-salinity wastewater zero-discharge systems have high control requirements, with numerous and complex control parameters. General operators often cannot promptly address the many potential problems, leading to frequent operational failures and high operating costs. Very few projects can achieve long-term stable and reasonable operation. Therefore, the harmless and resource-based treatment of high-salinity wastewater is an urgent task, and the development of high-salinity wastewater zero-discharge technologies that can operate stably, with low failure rates and low operating costs is even more urgent.

[0005] Meanwhile, existing zero-discharge processes for high-salinity wastewater, due to the limitations of PLC (Programmable Logic Controller) or DCS (Distributed Control System) systems, often rely on a small number of instruments to collect key data point-to-point and handle critical faults based on a few preset alarm points. The existing automation is essentially a non-intelligent, limited form of "fully automatic" requiring significant human intervention. This control method proves inadequate when executing complex processes like zero-discharge wastewater, failing to comprehensively address system-wide operational changes caused by variations in water quality, operating conditions, and temperature, and even less capable of providing early warnings for most risks. Summary of the Invention

[0006] The purpose of this invention is to provide a high-salt wastewater treatment system that uses a salt separation membrane to separate different substances in the high-salt wastewater. After the high-salt wastewater is concentrated, it is electrolyzed using chlorine production technology, which truly realizes the resource utilization of each substance in the high-salt wastewater and eliminates secondary pollution.

[0007] This invention provides a high-salinity wastewater treatment system, comprising a wastewater treatment device, which includes a wastewater impurity removal device, a wastewater concentration device, and an electrolytic chlorination device. The wastewater impurity removal device includes a high-salinity wastewater collection and aeration tank and an ultrafiltration membrane filtration system. The wastewater concentration device includes a weak acid cation exchanger, a high-pressure reverse osmosis device, a high-pressure nanofiltration membrane treatment device, and a stacked-plate reverse osmosis device. The high-salinity wastewater collection and aeration tank, the ultrafiltration membrane filtration system, the weak acid cation exchanger, the high-pressure reverse osmosis device, the high-pressure nanofiltration membrane treatment device, the stacked-plate reverse osmosis device, and the electrolytic chlorination device are connected in sequence.

[0008] The high-salinity wastewater collection and aeration tank is used for mixing and aerating the high-salinity wastewater; the ultrafiltration membrane filtration system is used for filtering suspended solids in the high-salinity wastewater; the weak acid cation exchanger is used to remove divalent and higher-valent cations from the high-salinity wastewater while retaining sodium ions; the high-pressure reverse osmosis device is used to concentrate the high-salinity wastewater, and the concentrated high-salinity wastewater enters the high-pressure nanofiltration membrane treatment device; the high-pressure nanofiltration membrane treatment device is used to separate monovalent and divalent salts in the high-salinity wastewater to remove divalent salts; the stacked reverse osmosis device is used for secondary concentration of the high-salinity wastewater, and the secondary concentrated high-salinity wastewater enters the electrolytic chlorination device; the electrolytic chlorination device is used to electrolyze the high-salinity wastewater to obtain hydrogen, chlorine, and sodium hypochlorite solution.

[0009] Furthermore, the wastewater treatment device also includes a sodium hypochlorite solution storage tank, which is connected to the electrolytic chlorination device and is used to store the sodium hypochlorite solution generated in the electrolytic chlorination device.

[0010] Furthermore, the high-salinity wastewater collection and aeration tank is also used for sterilization treatment of high-salinity wastewater; the high-salinity wastewater treatment system also includes a first return pipeline, the two ends of which are respectively connected to the high-salinity wastewater collection and aeration tank and the sodium hypochlorite solution storage tank, and the first return pipeline is used to transport the sodium hypochlorite solution in the sodium hypochlorite solution storage tank to the high-salinity wastewater collection and aeration tank.

[0011] Furthermore, the ultrafiltration membrane filtration system includes a reaction concentration tank, a TMF membrane treatment device, and a product water tank. The reaction concentration tank is connected to the high-salt wastewater collection and aeration tank, the TMF membrane treatment device is connected to the reaction concentration tank, the product water tank is connected to the TMF membrane treatment device, and the weak acid cation exchanger is connected to the product water tank.

[0012] Furthermore, the high-salinity wastewater treatment system also includes a second return pipeline, the two ends of which are connected to the high-salinity wastewater collection and aeration tank and the high-pressure nanofiltration membrane treatment device, respectively. The second return pipeline is used to transport the divalent salt solution separated by the high-pressure nanofiltration membrane treatment device to the high-salinity wastewater collection and aeration tank.

[0013] Furthermore, the high-salt wastewater treatment system also includes an MVR evaporator, which is connected to the high-pressure nanofiltration membrane treatment device. The MVR evaporator is used to evaporate the divalent salt solution separated by the high-pressure nanofiltration membrane treatment device.

[0014] Furthermore, the high-salinity wastewater treatment system also includes a data analysis and processing system, which comprises a data acquisition system and a data analysis and control system. The data acquisition system is connected to the wastewater treatment device and is used to acquire the operating parameters of the wastewater treatment device. The data acquisition system is signal-connected to the data analysis and control system, which is used to record and analyze the operating parameters of the wastewater treatment device and control the operation mode of the wastewater treatment device based on the current operating parameters.

[0015] Furthermore, the data analysis and control system includes a primary control system, a central intelligent processing system, and an online smart water management system. The primary control system is signal-connected to the central intelligent processing system, and the central intelligent processing system is signal-connected to the online smart water management system.

[0016] The data acquisition system includes a first-class data acquisition system and a second-class data acquisition system. The first-class data acquisition system is used to collect the routine operating parameters of the wastewater treatment device, and the second-class data acquisition system is used to collect the high-order operating parameters of the wastewater treatment device.

[0017] The data acquisition system is connected to the primary control system via signal transmission; the primary control system is used to control the operation mode of the wastewater treatment device according to the normal operating parameters of the wastewater treatment device, and to transmit abnormal normal operating parameters that it cannot handle to the central intelligent processing system.

[0018] The second type of data acquisition system is connected to the central intelligent processing system by signal; the central intelligent processing system is used to control the operation mode of the wastewater treatment device according to the high-order operating parameters of the wastewater treatment device, and to analyze and process the abnormal normal operating parameters that the first-level control system cannot handle, and at the same time transmit the abnormal normal operating parameters and high-order operating parameters that it cannot handle to the online smart water system.

[0019] The online smart water system is used to collect routine and advanced operating parameters that the central intelligent processing system cannot handle, and push these parameters to the user terminal.

[0020] Furthermore, both the central intelligent processing system and the online smart water system have wireless transmission capabilities, enabling wireless communication between the central intelligent processing system and the online smart water system. The online smart water system can then push abnormal routine operating parameters and high-level operating parameters that the central intelligent processing system cannot process to the user terminal via wireless communication.

[0021] Furthermore, the primary control system includes a first primary control system, a second primary control system, and a third primary control system, all of which are signal-connected to the central intelligent processing system.

[0022] The data acquisition system includes a first type of data acquisition system, a second type of data acquisition system, and a third type of data acquisition system; the first type of data acquisition system is connected to the wastewater removal device and is signal-connected to the first-level control system; the second type of data acquisition system is connected to the wastewater concentration device and is signal-connected to the second-level control system; the third type of data acquisition system is connected to the electrolytic chlorination device and is signal-connected to the third-level control system.

[0023] The two types of data acquisition systems include a first type of data acquisition system, a second type of data acquisition system, and a third type of data acquisition system; the first type of data acquisition system is connected to the wastewater removal device, the second type of data acquisition system is connected to the wastewater concentration device, and the third type of data acquisition system is connected to the electrolytic chlorination device; all three types of data acquisition systems are connected to the central intelligent processing system via signal connection.

[0024] The high-salinity wastewater treatment system provided by this invention first uses a high-salinity wastewater collection and aeration tank and an ultrafiltration membrane filtration system to mix, aerate, and filter the high-salinity wastewater to remove impurities. Then, a weak acid cation exchanger, a high-pressure reverse osmosis device, a high-pressure nanofiltration membrane treatment device, and a stacked reverse osmosis device are used to concentrate and separate the high-salinity wastewater to remove high-valence cation impurities, resulting in a concentrated sodium chloride solution. Finally, an electrolytic chlorination device is used to electrolyze the high-concentration sodium chloride solution to obtain hydrogen, chlorine, and sodium hypochlorite solution, thereby truly realizing the resource utilization of various substances in the high-salinity wastewater without generating secondary pollution. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the high-salt wastewater treatment system in an embodiment of the present invention.

[0026] Figure 2 This is a structural block diagram of the data analysis and processing system in an embodiment of the present invention.

[0027] Figure 3 This is a schematic diagram of the high-salt wastewater treatment system in another embodiment of the present invention. Detailed Implementation

[0028] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0029] The terms “first,” “second,” “third,” “fourth,” etc. (if present) in the specification and claims of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0030] like Figure 1 As shown, the high-salinity wastewater treatment system provided in this embodiment of the invention includes a wastewater treatment device 1, which includes a wastewater removal device, a wastewater concentration device, and an electrolytic chlorination device 17. The wastewater removal device includes a high-salinity wastewater collection and aeration tank 11 and an ultrafiltration membrane (TMF membrane) filtration system 12. The wastewater concentration device includes a weak acid cation exchanger 13, a high-pressure reverse osmosis (SWRO) device 14, a high-pressure nanofiltration membrane (HNF membrane) treatment device 15, and a stacked disc reverse osmosis (DTRO) device 16. The high-salinity wastewater collection and aeration tank 11, the ultrafiltration membrane filtration system 12, the weak acid cation exchanger 13, the high-pressure reverse osmosis device 14, the high-pressure nanofiltration membrane treatment device 15, the stacked disc reverse osmosis device 16, and the electrolytic chlorination device 17 are connected in sequence.

[0031] The high-salinity wastewater collection and aeration tank 11 is used for mixing and aerating high-salinity wastewater; the ultrafiltration membrane filtration system 12 is used for filtering suspended solids in the high-salinity wastewater; the weak acid cation exchanger 13 is used to remove divalent and higher-valent cations from the high-salinity wastewater while retaining sodium ions; the high-pressure reverse osmosis unit 14 is used to concentrate the high-salinity wastewater, and the concentrated high-salinity wastewater enters the high-pressure nanofiltration membrane treatment unit 15; the high-pressure nanofiltration membrane treatment unit 15 is used to separate monovalent and divalent salts in the high-salinity wastewater to remove divalent salts; the stacked reverse osmosis unit 16 is used for secondary concentration of the high-salinity wastewater, and the secondary concentrated high-salinity wastewater enters the electrolytic chlorination unit 17; the electrolytic chlorination unit 17 is used to electrolyze the high-salinity wastewater to obtain hydrogen, chlorine, and sodium hypochlorite solution.

[0032] Specifically, the high-salinity wastewater treatment system provided in this embodiment first uses a high-salinity wastewater collection and aeration tank 11 and an ultrafiltration membrane filtration system 12 to mix, aerate, and filter the high-salinity wastewater to remove impurities. Then, a weak acid cation exchanger 13, a high-pressure reverse osmosis device 14, a high-pressure nanofiltration membrane treatment device 15, and a stacked reverse osmosis device 16 are used to concentrate and separate the high-salinity wastewater to remove high-valence cation impurities and obtain a concentrated sodium chloride solution. Then, an electrolytic chlorination device 17 is used to electrolyze the high-concentration sodium chloride solution to obtain hydrogen, chlorine, and sodium hypochlorite solution, thereby truly realizing the resource utilization of various substances in the high-salinity wastewater and eliminating secondary pollution.

[0033] Furthermore, such as Figure 1 As shown, in this embodiment, the wastewater treatment device 1 further includes a sodium hypochlorite solution storage tank 18, which is connected to the electrolytic chlorine generation device 17. The sodium hypochlorite solution storage tank 18 is used to store the sodium hypochlorite solution generated in the electrolytic chlorine generation device 17.

[0034] Furthermore, such as Figure 1 As shown, in this embodiment, the high-salinity wastewater collection and aeration tank 11 is also used for sterilization treatment of the high-salinity wastewater. The high-salinity wastewater treatment system also includes a first return pipeline 111, the two ends of which are connected to the high-salinity wastewater collection and aeration tank 111 and the sodium hypochlorite solution storage tank 18, respectively. The first return pipeline 111 is used to transport the sodium hypochlorite solution in the sodium hypochlorite solution storage tank 18 to the high-salinity wastewater collection and aeration tank 11, thereby using the sodium hypochlorite solution to sterilize the high-salinity wastewater and realizing the reuse of the disinfectant.

[0035] Furthermore, such as Figure 1As shown, in this embodiment, the high-salt wastewater treatment system also includes a second return pipeline 112. The two ends of the second return pipeline 112 are respectively connected to the high-salt wastewater collection and aeration tank 11 and the high-pressure nanofiltration membrane treatment device 15. The second return pipeline 112 is used to transport the divalent salt solution separated by the high-pressure nanofiltration membrane treatment device 15 to the high-salt wastewater collection and aeration tank 11, so as to perform repeated filtration and separation treatment of the divalent salt solution.

[0036] like Figure 3 As shown, in another embodiment, the high-salt wastewater treatment system also includes an MVR evaporator 19, which is connected to the high-pressure nanofiltration membrane treatment device 15. The MVR evaporator 19 is used to evaporate the divalent salt solution separated by the high-pressure nanofiltration membrane treatment device 15 to obtain divalent salt, thereby realizing the recycling and reuse of divalent salt.

[0037] Furthermore, such as Figure 1 As shown, in this embodiment, the ultrafiltration membrane filtration system 12 includes a reaction concentration tank 121, a TMF membrane treatment device 122, and a product water tank 123. The reaction concentration tank 121 is connected to the high-salt wastewater collection and aeration tank 11, the TMF membrane treatment device 122 is connected to the reaction concentration tank 121, the product water tank 123 is connected to the TMF membrane treatment device 122, and the weak acid cation exchanger 13 is connected to the product water tank 123.

[0038] Furthermore, such as Figure 1 As shown, in this embodiment, the ultrafiltration membrane filtration system 12 further includes a third return pipeline 124, the two ends of which are connected to the raw water side (i.e., the inlet water side) of the TMF membrane treatment device 122 and the reaction concentration tank 121, respectively.

[0039] Specifically, the TMF membrane is a PTFE sintered microfiltration membrane with high fouling resistance and high chlorine tolerance. Replacing conventional lime softening, coagulation sedimentation, air flotation, and quartz sand filtration processes with this membrane system allows for fully automated operation and achieves water quality far exceeding that of conventional processes. During operation, high-salinity wastewater enters the reaction concentration tank 121 from the high-salinity wastewater collection aeration tank 11. Lime, magnesium oxide, and other chemicals are added to the reaction concentration tank 121 to treat the high-salinity wastewater. The treated high-salinity wastewater is then pumped to the TMF membrane treatment unit 122. Utilizing the filtration principle of the microfiltration membrane (TMF membrane), suspended solids are intercepted on the raw water side of the TMF membrane through tangential flow filtration and returned to the reaction concentration tank 121 via the third return pipeline 124 for repeated filtration. The suspended solids in the high-salinity wastewater treated by the TMF membrane are reduced to extremely low levels and then enter the product water tank 123.

[0040] Specifically, in this embodiment, the wastewater treatment device 1's treatment process for high-salinity wastewater includes:

[0041] 1. Collect high-salt wastewater generated in industrial production (such as reverse osmosis concentrate, power plant desulfurization wastewater, coal chemical concentrate wastewater, etc.) into high-salt wastewater collection and aeration tank 11, and mix, aerate and sterilize the high-salt wastewater in the high-salt wastewater collection and aeration tank 11.

[0042] 2. After being treated to the required standard in the high-salinity wastewater collection and aeration tank 11, the high-salinity wastewater enters the reaction concentration tank 121. Lime, magnesium agent and other chemicals are added to the reaction concentration tank 121 to treat the high-salinity wastewater. After chemical treatment, the high-salinity wastewater is pumped to the TMF membrane treatment device 122. Using the filtration principle of the microfiltration membrane (TMF membrane), suspended solids are intercepted on the raw water side of the TMF membrane through tangential flow filtration and returned to the reaction concentration tank 121 through the third return pipeline 124 for repeated filtration of the wastewater. The suspended solids in the high-salinity wastewater after passing through the TMF membrane are reduced to an extremely low value and enter the product water tank 123.

[0043] 3. The high-salinity wastewater after TMF membrane treatment enters the weak acid cation exchanger 13. The weak acid cation exchange resin in the weak acid cation exchanger 13 replaces cationic pollutants in the wastewater, such as calcium, magnesium, and strontium, removing divalent and higher-valent cations, leaving almost only sodium ions in the water. The weak acid cation exchange resin has the advantage of a large working exchange capacity, effectively softening the water and producing minimal regeneration wastewater. The weak acid cation exchange resin is packed in a carbon steel rubber-lined ion exchanger, and operation, backwashing, and regeneration are all automated through an automatic valve assembly.

[0044] 4. The high-salt wastewater after being treated by the weak acid cation exchanger 13 enters the high-pressure reverse osmosis unit 14 for wastewater concentration treatment. The wastewater after being treated by the high-pressure reverse osmosis unit 14 is divided into fresh water and high-salt concentrated water. The fresh water can be directly returned to the plant's water system for use. The concentrated high-salt concentrated water enters the high-pressure nanofiltration membrane treatment unit 15.

[0045] 5. The high-salt wastewater treated by the high-pressure reverse osmosis unit 14 enters the high-pressure nanofiltration membrane treatment unit 15. The high-pressure nanofiltration membrane treatment unit 15 separates the monovalent and divalent salts in the high-salt wastewater. The main component of the monovalent salt wastewater is NaCl (if the monovalent salt wastewater is crystallized, the purity of the crystallized NaCl can reach more than 99.6%), and the main component of the divalent salt wastewater is Na2SO4. The two water streams are treated separately. The monovalent salt wastewater enters the stacked plate reverse osmosis unit 16, and the divalent salt wastewater is returned to the high-salt wastewater collection aeration tank 11 through the second return pipeline 112, thereby repeatedly filtering and separating the divalent salt solution; or the divalent salt wastewater enters the MVR evaporator 19, and the divalent salt solution is evaporated by the MVR evaporator 19 to obtain divalent salt, realizing the recycling and reuse of divalent salt.

[0046] 6. The high-salt wastewater treated by the high-pressure nanofiltration membrane treatment device 15 enters the disc reverse osmosis device 16. The high-salt wastewater undergoes secondary concentration in the disc reverse osmosis device 16. The wastewater treated by the disc reverse osmosis device 16 is divided into fresh water and ultra-high salinity brine (its TDS can reach 120000mg / L). The fresh water can be directly returned to the plant's water system for use, and the ultra-high salinity brine enters the electrolytic chlorination device 17.

[0047] 7. The high-salt wastewater treated by the stacked reverse osmosis unit 16 enters the electrolytic chlorination unit 17. The electrolytic chlorination unit 17 electrolyzes the high-salt wastewater to obtain hydrogen, chlorine, and sodium hypochlorite solution. The hydrogen and chlorine can be purified to meet the quality standards of industrial-grade hydrogen and chlorine, and then fed into a synthesis furnace to synthesize hydrogen chloride for recycling. The sodium hypochlorite solution is transported to the sodium hypochlorite solution storage tank 18. A small portion of the sodium hypochlorite solution in the storage tank 18 is returned to the high-salt wastewater collection aeration tank 11 through the first return pipeline 111, thereby using the sodium hypochlorite solution to sterilize the high-salt wastewater and realize the reuse of disinfectant. Most of the sodium hypochlorite solution is supplied to the circulating water dosing and sterilization system dosing systems of other processes in the plant.

[0048] Furthermore, such as Figure 1 and Figure 2 As shown, in this embodiment, the high-salinity wastewater treatment system further includes a data analysis and processing system, which comprises a data acquisition system 3 and a data analysis and control system 2. The data acquisition system 3 is connected to the wastewater treatment device 1 and is used to acquire the operating parameters of the wastewater treatment device 1. The data acquisition system 3 is also connected to the data analysis and control system 2, which is used to record and analyze the operating parameters of the wastewater treatment device 1 and control the operation mode of the wastewater treatment device 1 according to the current operating parameters.

[0049] Furthermore, such as Figure 1 and Figure 2 As shown, in this embodiment, the data analysis and control system 2 includes a primary control system 21, a central intelligent processing system 22 (i.e., a secondary control system) and an online smart water system 23 (i.e., a tertiary control system). The primary control system 21 is connected to the central intelligent processing system 22 by signal, and the central intelligent processing system 22 is connected to the online smart water system 23 by signal.

[0050] The data acquisition system 3 includes a first-class data acquisition system 31 and a second-class data acquisition system 32. The first-class data acquisition system 31 is used to collect the conventional operating parameters of the wastewater treatment device 1, and the second-class data acquisition system 32 is used to collect the high-order operating parameters of the wastewater treatment device 1.

[0051] A data acquisition system 31 is connected to a primary control system 21. The data acquisition system 31 transmits the normal operating parameters of the wastewater treatment device 1 it acquires to the primary control system 21. The primary control system 21 is used to control the operation mode of the wastewater treatment device 1 according to the normal operating parameters of the wastewater treatment device 1, and transmits abnormal normal operating parameters that it cannot handle to the central intelligent processing system 22.

[0052] The Class II data acquisition system 32 is connected to the central intelligent processing system 22. The Class II data acquisition system 32 transmits the high-order operating parameters of the wastewater treatment device 1 it acquires to the central intelligent processing system 22. The central intelligent processing system 22 is used to control the operation mode of the wastewater treatment device 1 according to the high-order operating parameters of the wastewater treatment device 1, and to analyze and process the abnormal normal operating parameters that the primary control system 21 cannot handle. At the same time, it transmits the abnormal normal operating parameters and high-order operating parameters that it cannot handle to the online smart water system 23.

[0053] The online smart water system 23 is used to collect routine and high-level operating parameters that the central intelligent processing system 22 cannot handle, and push these parameters to the user terminal.

[0054] Furthermore, such as Figure 1 and Figure 2 As shown, in this embodiment, both the central intelligent processing system 22 and the online smart water system 23 have wireless transmission capabilities. The central intelligent processing system 22 and the online smart water system 23 can communicate wirelessly. The online smart water system 23 can push abnormal normal operating parameters and high-level operating parameters that the central intelligent processing system 22 cannot process to the user terminal through wireless communication.

[0055] Specifically, the primary control system 21 generally consists of a PLC, an HMI, and supporting modules. This primary control system 21 needs to collect and record routine operating parameter data, automatically handle problems related to routine operating parameters, transmit data to the central intelligent processing system 22, and provide early warnings. The central intelligent processing system 22 needs to collect, compare, and analyze data, record operating status information, store system data, issue processing plans to the primary control system 21, transmit data to higher-level systems, and provide early warnings and alarms. The central intelligent processing system 22 also has the authority to issue alarms to operators and request their assistance in handling operational faults. The central intelligent processing system 22 needs to have wireless transmission capabilities to transmit critical information to the online smart water management system 23 via a wireless transmitter. The online smart water management system 23 needs to have functions such as data collection, comparison, and analysis; recording operational status information; data classification; storage and analysis of data from all subsystems; reporting risks and faults to the fault handling center; assisting professional engineers in extracting data; designing and modifying operational plans; and recording events for other subsystems to access and reference. The online smart water management system 23 also needs to have wireless transmission capabilities to transmit critical information to the central intelligent processing system 22 for modifying operational plans, and to send targeted data to relevant apps for remote data processing by engineers. The fault handling center for the online smart water management system 23 can be set up by the operator or jointly by the operator and the technology provider.

[0056] Specifically, the data analysis and processing system operates as follows:

[0057] 1. The routine operating parameters collected by the data acquisition system 31 are first processed and recorded directly by the primary control system 21. The primary control system 21 analyzes and judges the routine operating parameter data. If the changes are within the preset program, the primary control system 21 will directly issue an operation change command to the wastewater treatment device 1. The wastewater treatment device 1 changes its operating mode and records the change. If the routine operating parameter data exceeds the preset program range of the primary control system 21, the primary control system 21 transmits the abnormal routine operating parameters that it cannot process to the central intelligent processing system 22. The central intelligent processing system 22 compares the abnormal routine operating parameters with its database, analyzes the operational risks, and provides resolution instructions. If necessary, the system reminds front-line control personnel to participate in resolving the risks. All data entering the central intelligent processing system 22 will be archived and uploaded to the online smart water system 23. If the central intelligent processing system 22 is still unable to resolve the abnormal normal operating parameters, the central intelligent processing system 22 will wirelessly transmit the abnormal normal operating parameters to the online smart water system 23, which will then push the abnormal normal operating parameters to the user terminal (for example, the online smart water system 23 will directly transmit the risk data to the water company's operation risk handling center, and further contact professional engineers directly through tools such as mobile APP, so that the professional engineers in the fault handling center can take the lead in handling the possible risks or faults).

[0058] 2. The high-level operating parameters collected by the Class II data acquisition system 32 are directly processed and recorded by the central intelligent processing system 22. The central intelligent processing system 22 analyzes and judges the high-level operating parameter data. If the changes are within the preset program, the central intelligent processing system 22 will directly issue an operation change command to the wastewater treatment device 1, and the wastewater treatment device 1 will change its operating mode and record it. If the high-level operating parameter data exceeds the preset program range of the central intelligent processing system 22, the central intelligent processing system 22 will wirelessly transmit the abnormal high-level operating parameters that it cannot process to the online smart water system 23, and the online smart water system 23 will push the abnormal high-level operating parameters to the user terminal.

[0059] This embodiment sets up a data acquisition system 3 and a three-level data analysis and control system 2. The data acquisition system 3 is divided into a primary data acquisition system 31 and a secondary data acquisition system 32, which categorizes the operating parameters of the wastewater treatment device 1 into conventional operating parameters and advanced operating parameters. Conventional operating parameters are directly processed by the primary control system 21, while advanced operating parameters are directly processed by the central intelligent processing system 22. This achieves data classification and processing, ensuring the stability and orderliness of the data analysis and processing system and improving the system's automation control level. General conventional operating parameters can be processed promptly and effectively on-site, ensuring the system's normal operation. Potential operational risks are uploaded to the more intelligent central intelligent processing system 22 and the online smart water system 23, where they are matched with more detailed central data for analysis and processing. The system can also notify the fault handling center and professional engineers online to identify subtle risks in a timely manner, avoiding situations where on-site operators lack experience and fail to effectively identify risks. At the same time, the online smart water system 23 can collect and archive operating data from this system or all authorized systems, collecting and accumulating large amounts of system data for comprehensive data utilization. The model of this data analysis and processing system can also provide experience guidance for other water treatment projects.

[0060] Furthermore, such as Figure 1 and Figure 2 As shown, in this embodiment, the primary control system 21 includes a first primary control system 211, a second primary control system 212, and a third primary control system 213. The first primary control system 211, the second primary control system 212, and the third primary control system 213 are all connected to the central intelligent processing system 22 via signals.

[0061] The data acquisition system 31 includes a first type of data acquisition system 311, a second type of data acquisition system 312, and a third type of data acquisition system 313. The first type of data acquisition system 311 is connected to a wastewater removal device (including a high-salinity wastewater collection and aeration tank 11 and an ultrafiltration membrane filtration system 12) and is signal-connected to a first-level control system 211. The second type of data acquisition system 312 is connected to a wastewater concentration device (including a weak acid cation exchanger 13, a high-pressure reverse osmosis device 14, a high-pressure nanofiltration membrane treatment device 15, and a stacked reverse osmosis device 16) and is signal-connected to a second-level control system 212. The third type of data acquisition system 313 is connected to an electrolytic chlorination device 17 and is signal-connected to a third-level control system 213.

[0062] The second-class data acquisition system 32 includes a first-class data acquisition system 321, a second-class data acquisition system 322, and a third-class data acquisition system 323. The first-class data acquisition system 321 is connected to the wastewater removal device, the second-class data acquisition system 322 is connected to the wastewater concentration device, and the third-class data acquisition system 323 is connected to the electrolytic chlorination device 17. The first-class data acquisition system 321, the second-class data acquisition system 322, and the third-class data acquisition system 323 are all connected to the central intelligent processing system 22 via signal connection.

[0063] In this embodiment, three Class I data acquisition systems 31 and three Class II data acquisition systems 32 are set up to collect the conventional and high-order operating parameters of the three subsystems (wastewater removal device, wastewater concentration device, and electrolytic chlorine production device 17) respectively. At the same time, three primary control systems 21 are set up to control the three subsystems respectively, thereby further realizing the classification and hierarchical processing of data and ensuring the stability, orderliness, and timeliness of the data analysis and processing system.

[0064] Furthermore, in this embodiment, conventional operating parameters include parameters such as water flow rate, water temperature, water pressure, liquid level, salinity, conductivity, pH value, and turbidity of high-salinity wastewater during the operation of wastewater treatment device 1; higher-order operating parameters include parameters such as membrane system pressure, transmembrane pressure difference, and pump operating parameters during the operation of wastewater treatment device 1. Accordingly, the first type of data acquisition system 31 includes flow sensors, temperature sensors, pressure sensors, liquid level gauges, salinity meters, etc., and the second type of data acquisition system 32 includes pressure gauges, differential pressure gauges, etc. The components of the first type of data acquisition system 31 and the second type of data acquisition system 32 are distributed and arranged in various devices and pipelines in wastewater treatment device 1.

[0065] For example, in this embodiment, the conventional operating parameters of the high-salt wastewater collection and aeration tank 11 include: water flow rate, water temperature, water pressure, liquid level, suspended solids concentration, pH value, etc.; the advanced operating parameters include: COD, salinity, pump and blower current, shaft power, temperature, etc.

[0066] The conventional operating parameters of the reaction concentration tank 121 include: water flow rate, water temperature, water pressure, liquid level, suspended solids concentration, pH value, etc.; advanced operating parameters include: salinity, water pump current, shaft power, temperature, etc.

[0067] The conventional operating parameters of the TMF membrane treatment unit 122 and the product water tank 123 include: water flow rate, water temperature, water pressure, liquid level, suspended solids concentration, pH value, turbidity, etc.; advanced operating parameters include: salinity, pump current, shaft power, temperature, transmembrane pressure difference, cleaning cycle, etc.

[0068] The conventional operating parameters of the weak acid cation exchanger 13 include: water flow rate, water pressure, pressure difference, hardness, etc.; advanced operating parameters include: conductivity, water pump current, shaft power, temperature, regeneration cycle, etc.

[0069] The conventional operating parameters of the high-pressure reverse osmosis unit 14 include: water flow rate, water pressure, pressure difference, feed water conductivity, product water conductivity, ORP, etc.; advanced operating parameters include: concentrate conductivity, membrane system pressure rise trend, chemical cleaning cycle and effect monitoring, transmembrane pressure difference, pump current, shaft power, temperature, etc.

[0070] The conventional operating parameters of the high-pressure nanofiltration membrane treatment device 15 include: water flow rate, water pressure, pressure difference, and salinity; the advanced operating parameters include: conductivity, sulfate content, chloride ion content, membrane system pressure increase trend, chemical cleaning cycle and effect monitoring, transmembrane pressure difference, pump current, shaft power, and temperature.

[0071] The conventional operating parameters of the stacked reverse osmosis unit 16 include: water flow rate, water pressure, pressure difference, feed water conductivity, product water conductivity, etc.; advanced operating parameters include: concentrate salinity, membrane system pressure rise trend, chemical cleaning cycle and effect monitoring, transmembrane pressure difference, pump current, shaft power, temperature, etc.

[0072] The conventional operating parameters of the electrolytic chlorine production unit 17 include: water flow rate, water pressure, pressure difference, influent salinity, liquid level, and effective chlorine concentration; advanced operating parameters include: chemical cleaning cycle and effect monitoring, current, resistance, and temperature of the electrolytic chlorine production unit.

[0073] Of course, in other embodiments, the conventional and advanced operating parameters of each device can be categorized, adjusted, added, or deleted according to actual needs.

[0074] In this embodiment, the high-salt wastewater treatment system also includes a noise acquisition system, a video online system, and an online inspection instrument (not shown). The pressure acquisition system, noise acquisition system, video online system, and online inspection instrument are installed at various locations in the wastewater treatment device 1 to monitor the operating status of the wastewater treatment device 1 in real time.

[0075] The advantages of the high-salinity wastewater treatment system provided in this embodiment of the invention include:

[0076] 1. The high-salinity wastewater treatment system provided in this embodiment first uses a high-salinity wastewater collection and aeration tank 11 and an ultrafiltration membrane filtration system 12 to mix, aerate, and filter the high-salinity wastewater to remove impurities. Then, a weak acid cation exchanger 13, a high-pressure reverse osmosis device 14, a high-pressure nanofiltration membrane treatment device 15, and a stacked reverse osmosis device 16 are used to concentrate and separate the high-salinity wastewater to remove high-valence cation impurities and obtain a concentrated sodium chloride solution. Then, an electrolytic chlorination device 17 is used to electrolyze the high-concentration sodium chloride solution to obtain hydrogen, chlorine, and sodium hypochlorite solution. This organically combines TMF technology, SWRO technology, HNF technology, DTRO technology, and electrolytic chlorination technology to truly realize the resource utilization of various substances in high-salinity wastewater without generating secondary pollution. This high-salinity wastewater treatment system can not only treat high-salinity wastewater separately, but also utilize it as a resource, avoiding secondary pollution. While treating waste, it takes into account environmental, social and economic benefits. The system not only reduces the amount of salt used in industry, but also innovatively electrolyzes the originally extremely difficult-to-treat high-salinity wastewater to achieve resource utilization, truly achieving zero discharge of high-salinity wastewater.

[0077] 2. This high-salinity wastewater treatment system utilizes a full-membrane method and electrolytic chlorination to treat high-salinity wastewater. It features a high degree of automation, stable and controllable operation, and saves manpower.

[0078] 3. By setting up a sodium hypochlorite solution storage tank 18 and a first return pipeline 111, the first return pipeline 111 can transport the sodium hypochlorite solution in the sodium hypochlorite solution storage tank 18 to the high-salt wastewater collection and aeration tank 11, thereby using the sodium hypochlorite solution to sterilize the high-salt wastewater and realizing the reuse of the disinfectant.

[0079] 4. The divalent salt solution separated by the high-pressure nanofiltration membrane treatment device 15 can be returned to the high-salt wastewater collection aeration tank 11 through the second return pipeline 112, so as to repeatedly filter and separate the divalent salt solution, or enter the MVR evaporator 19 for evaporation treatment, so as to obtain divalent salt and realize the recycling and reuse of divalent salt.

[0080] 5. This embodiment sets up a data acquisition system 3 and a three-level data analysis and control system 2. The data acquisition system 3 is divided into a primary data acquisition system 31 and a secondary data acquisition system 32, that is, the operating parameters of the wastewater treatment device 1 are divided into conventional operating parameters and high-level operating parameters. The conventional operating parameters are directly processed by the primary control system 21, while the high-level operating parameters are directly processed by the central intelligent processing system 22. This achieves data classification and processing, ensures the stability and orderliness of the data analysis and processing system, and improves the degree of system automation control. General conventional operating parameters can be processed locally in a timely and effective manner, ensuring the normal operation of the system. Potential operational risks are uploaded to the more intelligent central intelligent processing system 22 and the online smart water system 23, matched with more detailed central data for analysis and processing, and can notify the fault handling center and professional engineers online to identify relatively subtle risks in a timely manner, avoiding situations where risks cannot be effectively identified due to the lack of experience of on-site operators. At the same time, the online smart water system 23 can collect and archive the operating data of this system or all authorized systems, collect and accumulate large amounts of system data for analysis, and achieve the purpose of comprehensive data utilization. The model of this data analysis and processing system can also provide experience guidance for other water treatment projects.

[0081] 6. In this embodiment, three Class I data acquisition systems 31 and three Class II data acquisition systems 32 are set up to collect the conventional and high-order operating parameters of three subsystems (wastewater removal device, wastewater concentration device and electrolytic chlorine production device 17) respectively. At the same time, three primary control systems 21 are set up to control the three subsystems respectively, thereby further realizing the classification and hierarchical processing of data, ensuring the stability, orderliness and timeliness of the data analysis and processing system.

[0082] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A high-salinity wastewater treatment system, characterized in that, The system includes a wastewater treatment device (1) and a data analysis and processing system. The wastewater treatment device (1) includes a wastewater impurity removal device, a wastewater concentration device, and an electrolytic chlorination device (17). The wastewater impurity removal device includes a high-salt wastewater collection and aeration tank (11) and an ultrafiltration membrane filtration system (12). The wastewater concentration device includes a weak acid cation exchanger (13), a high-pressure reverse osmosis device (14), a high-pressure nanofiltration membrane treatment device (15), and a stacked reverse osmosis device (16). The high-salt wastewater collection and aeration tank (11), the ultrafiltration membrane filtration system (12), the weak acid cation exchanger (13), the high-pressure reverse osmosis device (14), the high-pressure nanofiltration membrane treatment device (15), the stacked reverse osmosis device (16), and the electrolytic chlorination device (17) are connected in sequence. The high-salt wastewater collection and aeration tank (11) is used to mix and aerate the high-salt wastewater; the ultrafiltration membrane filtration system (12) is used to filter the suspended solids in the high-salt wastewater; the weak acid cation exchanger (13) is used to remove divalent and higher cations from the high-salt wastewater and retain sodium ions in the high-salt wastewater; the high-pressure reverse osmosis device (14) is used to concentrate the high-salt wastewater, and the concentrated high-salt wastewater enters the high-pressure nanofiltration membrane treatment device (15); The high-pressure nanofiltration membrane treatment device (15) is used to separate monovalent and divalent salts in high-salt wastewater to remove divalent salts from the high-salt wastewater; the stacked reverse osmosis device (16) is used to perform secondary concentration of high-salt wastewater, and the high-salt wastewater after secondary concentration enters the electrolytic chlorination device (17); the electrolytic chlorination device (17) is used to electrolyze the high-salt wastewater to obtain hydrogen, chlorine and sodium hypochlorite solution; The data analysis and processing system includes a data acquisition system (3) and a data analysis and control system (2); the data acquisition system (3) is connected to the wastewater treatment device (1) and is used to acquire the operating parameters of the wastewater treatment device (1); the data acquisition system (3) is connected to the data analysis and control system (2) and is used to record and analyze the operating parameters of the wastewater treatment device (1) and control the operation mode of the wastewater treatment device (1) according to the current operating parameters of the wastewater treatment device (1); The data analysis and control system (2) includes a primary control system (21), a central intelligent processing system (22), and an online smart water system (23). The primary control system (21) is connected to the central intelligent processing system (22) by signal, and the central intelligent processing system (22) is connected to the online smart water system (23) by signal. The data acquisition system (3) includes a first-class data acquisition system (31) and a second-class data acquisition system (32). The first-class data acquisition system (31) is used to collect the conventional operating parameters of the wastewater treatment device (1), and the second-class data acquisition system (32) is used to collect the high-order operating parameters of the wastewater treatment device (1). The data acquisition system (31) is connected to the primary control system (21) by signal; the primary control system (21) is used to control the operation mode of the wastewater treatment device (1) according to the normal operating parameters of the wastewater treatment device (1), and transmit abnormal normal operating parameters that it cannot handle to the central intelligent processing system (22). The second type of data acquisition system (32) is connected to the central intelligent processing system (22) by signal; the central intelligent processing system (22) is used to control the operation mode of the wastewater treatment device (1) according to the high-order operation parameters of the wastewater treatment device (1), and to analyze and process the abnormal normal operation parameters that the first-level control system (21) cannot handle, and at the same time transmit the abnormal normal operation parameters and high-order operation parameters that it cannot handle to the online smart water system (23). The online smart water system (23) is used to collect the normal operating parameters and high-order operating parameters of the abnormalities that the central intelligent processing system (22) cannot handle, and push the normal operating parameters and high-order operating parameters of the abnormalities that the central intelligent processing system (22) cannot handle to the user terminal.

2. The high-salinity wastewater treatment system as described in claim 1, characterized in that, The wastewater treatment device (1) also includes a sodium hypochlorite solution storage tank (18), which is connected to the electrolytic chlorine generation device (17). The sodium hypochlorite solution storage tank (18) is used to store the sodium hypochlorite solution generated in the electrolytic chlorine generation device (17).

3. The high-salinity wastewater treatment system as described in claim 2, characterized in that, The high-salt wastewater collection and aeration tank (11) is also used to sterilize the high-salt wastewater; the high-salt wastewater treatment system also includes a first return pipeline (111), the two ends of which are connected to the high-salt wastewater collection and aeration tank (11) and the sodium hypochlorite solution storage tank (18), respectively. The first return pipeline (111) is used to transport the sodium hypochlorite solution in the sodium hypochlorite solution storage tank (18) to the high-salt wastewater collection and aeration tank (11).

4. The high-salinity wastewater treatment system as described in claim 1, characterized in that, The ultrafiltration membrane filtration system (12) includes a reaction concentration tank (121), a TMF membrane treatment device (122), and a product water tank (123). The reaction concentration tank (121) is connected to the high-salt wastewater collection and aeration tank (11). The TMF membrane treatment device (122) is connected to the reaction concentration tank (121). The product water tank (123) is connected to the TMF membrane treatment device (122). The weak acid cation exchanger (13) is connected to the product water tank (123).

5. The high-salinity wastewater treatment system as described in claim 1, characterized in that, The high-salinity wastewater treatment system also includes a second return pipeline (112), the two ends of which are connected to the high-salinity wastewater collection and aeration tank (11) and the high-pressure nanofiltration membrane treatment device (15), respectively. The second return pipeline (112) is used to transport the divalent salt solution separated by the high-pressure nanofiltration membrane treatment device (15) to the high-salinity wastewater collection and aeration tank (11).

6. The high-salinity wastewater treatment system as described in claim 1, characterized in that, The high-salt wastewater treatment system also includes an MVR evaporator (19), which is connected to the high-pressure nanofiltration membrane treatment device (15). The MVR evaporator (19) is used to evaporate the divalent salt solution separated by the high-pressure nanofiltration membrane treatment device (15).

7. The high-salinity wastewater treatment system as described in claim 1, characterized in that, Both the central intelligent processing system (22) and the online smart water system (23) have wireless transmission capabilities. The central intelligent processing system (22) and the online smart water system (23) can communicate wirelessly. The online smart water system (23) can push abnormal normal operating parameters and high-level operating parameters that the central intelligent processing system (22) cannot handle to the user terminal through wireless communication.

8. The high-salinity wastewater treatment system as described in claim 1, characterized in that, The primary control system (21) includes a first primary control system (211), a second primary control system (212), and a third primary control system (213). The first primary control system (211), the second primary control system (212), and the third primary control system (213) are all connected to the central intelligent processing system (22) via signals. The data acquisition system (31) includes a first type of data acquisition system (311), a second type of data acquisition system (312), and a third type of data acquisition system (313); the first type of data acquisition system (311) is connected to the wastewater removal device and is signal-connected to the first primary control system (211); the second type of data acquisition system (312) is connected to the wastewater concentration device and is signal-connected to the second primary control system (212); the third type of data acquisition system (313) is connected to the electrolytic chlorine production device (17) and is signal-connected to the third primary control system (213). The second type of data acquisition system (32) includes a first type of data acquisition system (321), a second type of data acquisition system (322), and a third type of data acquisition system (323). The first type of data acquisition system (321) is connected to the wastewater removal device, the second type of data acquisition system (322) is connected to the wastewater concentration device, and the third type of data acquisition system (323) is connected to the electrolytic chlorine production device (17). The first type of data acquisition system (321), the second type of data acquisition system (322), and the third type of data acquisition system (323) are all connected to the central intelligent processing system (22) via signal connection.

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