Saline-alkali soil in-situ treatment system based on electric drive capture separation principle and treatment method of saline-alkali soil in-situ treatment system

Abstract

The invention discloses a saline-alkali soil in-situ treatment system based on an electrically-driven capture separation principle. The saline-alkali soil in-situ treatment system comprises a power supply system, a voltage regulation and control system connected with the power supply system, an electrolysis system connected with the voltage regulation and control system and a data acquisition system connected with the electrolysis system, the electrolysis system comprises a total probe and electrodes, and the electrodes comprise a negative electrode and a positive electrode; the electrolysis system comprises a single-group electrode working mode, a double-group electrode working mode and a multi-group electrode working mode; the multi-group electrode working mode comprises two ion enrichment electrode groups with opposite polarities; the working mode of the multiple groups of electrodes comprises an annular arrangement mode, the annular arrangement mode comprises at least one annular group, and the center of each annular group and a circle of ion enrichment electrode groups with opposite polarities are arranged around the center; a negative electrode and a positive electrode are inserted into the lower part of a total probe according to a working mode, an electrolysis system is arranged according to the working mode, and ions are enriched and collected in cooperation with a voltage regulation and control system; the invention further discloses a corresponding method. Flexible, efficient and sustainable in-situ treatment of the saline-alkali soil is realized.

Description

Technical Field

[0001] The present invention belongs to the technical field of saline-alkali land treatment, and more specifically, relates to a saline-alkali land in-situ treatment system and a treatment method thereof based on the principle of electric drive capture and separation. Background Art

[0002] In saline-alkali land, salt ions such as calcium, magnesium, potassium, chlorine, carbonate, and bicarbonate accumulate on the surface, which not only directly inhibits the absorption and utilization of water and nutrients by plants, resulting in stunted plant growth, but also further causes soil compaction. Soil compaction will significantly reduce soil porosity, deteriorate air permeability and water permeability, greatly limit the living space and activity of functional microorganisms in the soil, and further affect the abundance of microbial communities, metabolic rate, and activity of soil enzyme systems. Under the combined effect of these changes, the decomposition and conversion efficiency of soil organic matter is reduced, the balance of the soil ecosystem is destroyed, and ultimately has a profound negative impact on the quality of cultivated land.

[0003] In order to solve this problem, the commonly used treatment methods include physical, chemical, biological and comprehensive treatment measures, among which leaching treatment is the basic method for preliminary treatment of saline-alkali land and reducing the salinity of saline-alkali soil. However, since this method consumes a huge amount of water, and water resources are very scarce in the northwest region where saline-alkali land is widely distributed, the use of leaching measures does not conform to the environmental protection concept of green water conservation, and the salt-rich water produced cannot be directly discharged. Summary of the invention

[0004] In view of the above defects or improvement needs of the prior art, the present invention aims to solve the problems existing in the prior art.

[0005] In order to achieve the above-mentioned object, according to the first aspect of the present invention, there is provided an in-situ treatment system for saline-alkali land based on the principle of electric drive capture and separation, comprising a power supply system, a voltage control system connected to the power supply system, an electrolysis system connected to the voltage control system, and a data acquisition system connected to the upper part of the electrolysis system;

[0006] The electrolysis system comprises a main probe at the top and several electrodes movably connected to the bottom of the main probe, wherein the electrodes are of two types, namely, a cathode electrode and an anode electrode which are inserted into the saline-alkali land and made of ion exchange resin;

[0007] The electrolysis system includes single-group electrode, double-group electrode and multiple-group electrode working modes; the double-group electrode and multiple-group electrode working modes include two ion-enriching electrode groups with opposite polarities, and the two ion-enriching electrode groups with opposite polarities are respectively an anion-enriching electrode group composed of the negative electrode inserted completely under the total probe and a cation-enriching electrode group composed of the positive electrode inserted completely;

[0008] The multiple electrode groups working mode includes a ring arrangement, the ring arrangement includes at least one ring group, and the ion enrichment electrode group of opposite polarity is arranged at the center of each ring group and in a circle around the center;

[0009] The cathode electrode and the anode electrode are inserted into the lower part of the main probe according to the working mode requirements, and the electrolysis system is arranged according to the working mode, and then coordinated with the voltage control system to enrich and collect corresponding ions.

[0010] Furthermore, the ion exchange resin is detachable and its adsorption performance can be restored by ultrasonic cleaning.

[0011] Furthermore, the main probe is composed of an interface, a base and several waterproof sockets from top to bottom; the voltage control system and the data acquisition system are connected to the electrolysis system through the interface;

[0012] The waterproof socket is arranged at the center below the base and around the center;

[0013] The waterproof socket is connected to the electrode at the bottom so as to transmit the voltage distributed by the voltage regulation system to the electrode.

[0014] Furthermore, the cathode electrode and the anode electrode both include an insulating hard protective head at the bottom and also include an anion enriching electrode and a cation enriching electrode respectively, and the anion enriching electrode and the cation enriching electrode both include a conductive layer arranged at the top and connected to the waterproof socket.

[0015] A matching connector and a threaded area are provided at the bottom and matched with the protective head.

[0016] Furthermore, the cation-enriched electrode and the anion-enriched electrode are both made of conductive carbon fiber, and the cation-enriched electrode has several enriched strips formed by cation exchange resin distributed around it; the anion-enriched electrode is made of anion exchange resin.

[0017] Furthermore, the single-group electrode, double-group electrode and multiple-group electrode working modes can be used in a mixed manner and the operating range increases from small to large;

[0018] The single-group electrode working mode includes only one main probe and adopts a central ring arrangement, wherein the negative electrode and a plurality of positive electrodes or a positive electrode and a plurality of negative electrodes are respectively inserted into the waterproof sockets at the center of the base and around the center;

[0019] The dual-group electrode working mode adopts a symmetrical arrangement, and the symmetrical arrangement is to arrange one anion-enriching electrode group and one cation-enriching electrode group on both sides of the saline-alkali land respectively;

[0020] The multi-electrode working mode includes several of the total probes and also includes linear and dual arrangements;

[0021] The linear arrangement is to linearly cross-arrange the anion-enriched electrode group and the cation-enriched electrode group;

[0022] The dual arrangement includes several linear groups, wherein all the linear groups on a line are anion-enriched electrode groups or cation-enriched electrode groups, wherein adjacent linear groups are ion-enriched electrode groups of opposite polarity.

[0023] Furthermore, the power supply system includes a plurality of detachable modular batteries.

[0024] Furthermore, the voltage control system includes a dynamic control system for the positive and negative electrode relationship of the electrolysis system, an integrated intelligent system for voltage value control according to the desalination scheme and historical data, and an intelligent feedback voltage control system for real-time monitoring of the actual output voltage of the battery and comparing and controlling it with a preset voltage setting value.

[0025] Furthermore, the data acquisition system collects the voltage, current, temperature and usage rate of the ion exchange resin of the electrolysis system through built-in sensors; and estimates the conductivity of the soil saturated mud extract based on the measured voltage drop and current between the positive and negative electrodes to determine the salt reduction effect of the saline-alkali land.

[0026] According to the second aspect of the present invention, a saline-alkali land treatment method based on the electric drive principle is provided, which is implemented by applying the saline-alkali land in-situ treatment system based on the electric drive capture and separation principle, and includes the following steps:

[0027] S1, soil testing, select soil testing indicators and test indicator parameters according to GB / T 42828.3-2023;

[0028] S2, determine the impact range of desalination efficiency, test the desalination efficiency of the saline-alkali land in-situ treatment system based on the principle of electric drive capture and separation in the laboratory and on site, the test method is to take samples continuously at fixed intervals with the electrode as the center after desalination, test the soil salinity, and compare with the original soil sample to determine the impact range of electrode desalination;

[0029] S3, determine the desalination scheme, and determine the electric drive desalination scheme and technical parameters according to the soil index parameters and the on-site status of the saline-alkali land;

[0030] S4, soil saturation operation, saturating the desalination area through irrigation;

[0031] S5, desalination operation, setting the working mode and voltage of the saline-alkali land in-situ treatment system based on the electric drive capture and separation principle according to the result in S3, and desalting the desalination area;

[0032] S6, desalination efficiency monitoring, estimating the conductivity of the soil saturated mud extract through the data collected by the data acquisition system, and determining the salt reduction effect of the saline-alkali land;

[0033] S7, cleaning and replacing the ion exchange resin, replacing the saturated ion exchange resin and restoring its adsorption performance through ultrasonic cleaning;

[0034] S8, biological treatment, after desalination, apply salt-alkali-tolerant microbial fertilizer that meets NY / T1535 standard and plant crops;

[0035] S9, treatment and testing, after a set time, re-test the test indicators of the treated soil. If double salt phenomenon occurs, re-enter S3.

[0036] In general, the above technical solutions conceived by the present invention can achieve the following beneficial effects compared with the prior art:

[0037] 1. The in-situ treatment system for saline-alkali land based on the principle of electrically driven capture and separation of the present invention controls the arrangement of the electrodes, the voltage, and the positive and negative poles of the voltage, and adjusts and feeds back the relevant data through the data acquisition system, thereby promoting the migration and fixation of ions in the soil and achieving flexibility and efficiency in the treatment of saline-alkali land.

[0038] 2. The in-situ treatment system for saline-alkali land based on the principle of electrically driven capture and separation of the present invention can be reused by removing the saturated ion exchange resin and restoring its adsorption performance through ultrasonic cleaning, thereby reducing the application cost of the entire equipment.

[0039] 3. The present invention provides an in-situ treatment system for saline-alkali land based on the principle of electric drive capture and separation. The power supply system can be charged by new energy, and the voltage control system can perform real-time monitoring and dynamic adjustment of the output voltage to increase voltage stability and environmental adaptability, reduce damage to related equipment and energy waste due to voltage instability, and achieve environmental protection and sustainable development. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 A schematic diagram of the structure of an in-situ treatment system for saline-alkali land based on the principle of electric drive capture and separation provided in a preferred embodiment of the present invention;

[0041] Figure 2 A front view of an electrolysis system provided in a preferred embodiment of the present invention;

[0042] Figure 3 A front view of the overall probe provided for a preferred embodiment of the present invention;

[0043] Figure 4 A detailed diagram of the overall probe provided for a preferred embodiment of the present invention;

[0044] Figure 5 The anion-enriching electrode structure provided for the preferred embodiment of the present invention is intended;

[0045] Figure 6 The structural formula of the cation-enriched electrode provided for the preferred embodiment of the present invention is intended;

[0046] Figure 7 The arrangement of the working modes of a single set of electrodes provided in the preferred embodiment of the present invention;

[0047] Figure 8 The arrangement of the working modes of the two sets of electrodes provided in the preferred embodiment of the present invention;

[0048] Fig. 9 A linear arrangement of multiple groups of electrode working modes provided in a preferred embodiment of the present invention;

[0049] Fig.10 A dual arrangement of multiple groups of electrode working modes provided in a preferred embodiment of the present invention;

[0050] Fig.11 A preferred embodiment of the present invention provides a plurality of groups of electrodes arranged in a circular working mode.

[0051] In all the drawings, the same reference numerals represent the same technical features, specifically: 100-power supply system, 200-voltage control system, 300-electrolysis system, 310-main probe, 311-interface, 312-base, 313-waterproof socket, 320-electrode, 321-A-anion enriching electrode, 321-B-cation enriching electrode, 321-C-anion enriching electrode group, 321-D-cation enriching electrode group, 322-protective head, 400-data acquisition system. DETAILED DESCRIPTION

[0052] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0053] In order to effectively treat saline-alkali land, a saline-alkali land in-situ treatment system and a treatment method thereof based on the principle of electrically driven capture and separation are provided based on the following principles.

[0054] (1) Ultrasonic accelerated dissolution technology

[0055] Ultrasonic cleaning uses the cavitation, acceleration and straight-through flow of ultrasound in liquid to directly and indirectly affect liquid and dirt, so that the dirt layer is dispersed, emulsified and peeled off to achieve the purpose of cleaning. If the ions in the soil have many binding sites with the exchange membrane and the binding is strong, it is difficult to clean the ion exchange membrane contaminated by it. Ultrasonic enhanced ion exchange membrane chemical cleaning can more effectively remove pollutants from the exchange membrane, so that it can be reused.

[0056] (2) Electric drive capture technology

[0057] The principle of electric remediation technology is to insert electrodes into contaminated soil or groundwater areas to form an electric field by applying a weak current. Under the various electrodynamic effects generated by the electric field, pollutants migrate in a directional manner along the direction of the electric field. Pollutants that reach the electrode area are then processed or separated by electric precipitation (electroplating on electrode rods), deposition or co-deposition near the electrode rods, pumping water, or combining with ion exchange resins. At present, this technology is only used experimentally in the treatment of heavy metal contaminated soil, and has not yet been used in the treatment of saline-alkali land.

[0058] The main electrokinetic effects that accompany the electrokinetic repair process are:

[0059] Electrodialysis is the movement of water in the soil or groundwater from the anode to the cathode of the electrochemical electrode. The main moving substance is pore water; the speed is slow; in electrodialysis, soil properties have a greater impact on it.

[0060] Electromigration is the process of transporting ions or ion complexes in the soil to the opposite electrode. The main moving substances are charged ions, which move quickly. The soil properties have little effect on the electromigration process.

[0061] Electrophoresis is a transport phenomenon caused by charged particles or colloidal ions under the influence of an electric field. Pollutants are combined with particles to enable them to move in the soil. The main moving substance is colloidal ions, which move slowly. In electrophoresis, soil properties have a greater impact on electrophoresis.

[0062] (3) Chromatographic enrichment and solidification extraction technology

[0063] Ion exchange chromatography is an operating method that uses the difference in binding force between various charged ions in a solution and ion exchangers to separate substances. This method has high separation efficiency, simple operation, and the resin can be used repeatedly. Ion exchange resins can be divided into cation exchange resins, anion exchange resins, and chelating ion exchange resins. The appropriate resin can be selected according to the ions that need to be absorbed.

[0064] Please refer to Figure 1 The present invention relates to an in-situ treatment system for saline-alkali land based on the principle of electric drive capture and separation, comprising a power supply system 100, a voltage control system 200 connected to the power supply system 100, an electrolysis system 300 connected to the voltage control system 200, and a data acquisition system 400 connected to the upper part of the electrolysis system 300;

[0065] Please refer to Figure 2 , the main function of the electrolysis system 300 is to be inserted into the saline-alkali land, and to drive the anions and cations in the soil to be enriched to the positive and negative electrodes respectively by electric drive, and then collected by ion exchange resin. Under the action of the electric field, the ions in the saline-alkali land are directed to migrate to the ion exchange resin on the electrode, realizing the efficient capture and separation of the ions. This process not only utilizes the powerful driving force of the electrolysis technology, but also gives full play to the selective adsorption ability of the ion exchange resin for ions, achieving a double improvement in the treatment effect. The electrolysis system 300 includes an upper main probe 310 and several electrodes 320 movably connected to the lower part of the main probe 310. There are two types of electrodes 320, namely, a cathode electrode (positive electrode) and an anode electrode (negative electrode) inserted into the saline-alkali land and made of ion exchange resin;

[0066] Please refer to Figure 3 and Figure 4 The function of the main probe 310 is to allocate the positive and negative polarity relationship of each sub-electrode based on different electrode action modes; the main probe 310 is composed of an interface 311, a base 312 and several waterproof sockets 313 from top to bottom;

[0067] The voltage control system 200 and the data acquisition system 400 are both connected to the electrolysis system 300 via the interface 311 (that is, the upper part of the main probe 310 is connected to the sensor in the voltage control system 200 and the data acquisition system 400);

[0068] The waterproof socket 313 is arranged at the center below the base 312 and around the center;

[0069] The waterproof socket 313 is connected to the electrode 320 at its lower side so as to transmit the voltage distributed by the voltage regulation system 200 to the electrode 320 .

[0070] In some embodiments, seven waterproof sockets 313 are distributed at the lower part of the main probe 310 , which can be respectively connected to seven negative electrodes (positive electrodes) or positive electrodes (negative electrodes) through the waterproof sockets 313 .

[0071] Please refer to Figure 5 and Figure 6The cathode electrode and the anode electrode in the electrode 320 both include an insulating hard protective head 322 at the bottom and also include an anion-enriched electrode 321-A and a cation-enriched electrode 321-B respectively. The anion-enriched electrode 321-A and the cation-enriched electrode 321-B both include a joint arranged at the top and matching the waterproof socket 313 and a threaded area arranged at the bottom and matching the protective head 322.

[0072] The cation-enriched electrode 321-B and the anion-enriched electrode 321-A are both made of conductive carbon fiber. The cation-enriched electrode 321-B has several enriched strips formed by cation exchange resin distributed around it; the anion-enriched electrode 321-A is made of anion exchange resin. When the ion exchange resins on the anion-enriched electrode 321-A and the cation-enriched electrode 321-B are saturated, the ion exchange resins can be removed and replaced with clean ion exchange resins for continued use. After the ion exchange resin reaches a saturated state, the ions adsorbed on the resin can be efficiently removed by the action of ultrasound, its adsorption capacity can be restored, and the resin can be reused. This not only solves the problem of frequent and costly resin replacement in traditional methods, but also greatly improves the efficiency and economy of treatment. At the same time, ultrasonic cleaning, as a green and environmentally friendly cleaning method, will not cause secondary pollution to the soil and the environment, ensuring the green sustainability of the treatment process.

[0073] In some embodiments, the cation enrichment electrode 321-B has 6 enrichment strips formed by cation exchange resin distributed around it, which are used to capture positive metal cations enriched near the negative electrode due to electric field driving. The enrichment strips of the anion enrichment electrode 321-A are made of anion exchange resin as a material, and are used to capture negative alkaline anions enriched near the positive electrode due to electric field driving. The protective head 322 is made of insulating and high-strength hard plastic, which facilitates the probe to be pressed into the compacted soil.

[0074] The electrolysis system 300 includes single-group electrode, double-group electrode and multiple-group electrode working modes; the double-group electrode and multiple-group electrode working modes include two ion-enriching electrode groups of opposite polarities, and the two ion-enriching electrode groups of opposite polarities are respectively an anion-enriching electrode group 321-C formed by inserting all the cathode electrodes under the main probe 310 and a cation-enriching electrode group 321-D formed by inserting all the anode electrodes;

[0075] The single-group electrode, double-group electrode and multiple-group electrode working modes can be used in a mixed manner and the operating range increases from small to large;

[0076] Please refer to Figure 7The single-group electrode working mode includes only one main probe 310 and adopts a central ring arrangement, wherein the negative electrode and a plurality of positive electrodes or a positive electrode and a plurality of negative electrodes are respectively inserted into the waterproof socket 313 at the center of the base 312 and around the center;

[0077] In some embodiments, the center can be the cathode electrode, and the surrounding six electrodes can be the anode electrodes. This arrangement will generate an electric field in a small area around the electrode. Under the action of the current, cations are enriched at the cathode and anions are enriched at the anode, and they are absorbed by ion exchange resins respectively, thereby achieving the effect of desalination. The effective range of the single electrode working mode is small, but the desalination efficiency is high.

[0078] For scenarios requiring large-area desalination, multiple main probes 310 may be used, and different electrodes 320 may be replaced to form a larger loop, such as the dual-electrode working mode and the multi-electrode working mode.

[0079] The dual-group electrode working mode adopts a symmetrical arrangement, and the symmetrical arrangement is to arrange one anion-enriching electrode group 321-C and one cation-enriching electrode group 321-D on both sides of the saline-alkali land respectively;

[0080] Please refer to Figure 8 In some embodiments, 7 anion-enriched electrode groups 321-C (left) and 7 cation-enriched electrode groups 321-D (right) are respectively used, inserted into the soil at a certain distance, and powered by the power supply system 100 and the voltage control system 200. Current will be generated between the two electrodes. Similarly, under the action of the current, cations are enriched at the negative electrode (right) and anions are enriched at the positive electrode (left), and are absorbed by ion exchange resins respectively. Through different electrode arrangement patterns, the working area can be increased and the salt content of saline-alkali land can be reduced as a whole.

[0081] The multi-electrode working mode includes a plurality of the main probes 310 and includes linear, dual and circular arrangements;

[0082] Please refer to Fig. 9 The linear arrangement is to linearly cross-arrange the anion-enriched electrode group 321-C and the cation-enriched electrode group 321-D, which can be used in general farmland.

[0083] Please refer to Fig.10 The dual arrangement includes several linear groups, wherein all the linear groups on a line are anion-enriched electrode groups 321-C or cation-enriched electrode groups 321-D, wherein adjacent linear groups are ion-enriched electrode groups of opposite polarity.

[0084] Please refer to Fig.11 , the annular arrangement includes more than one annular group, and the ion enrichment electrode group of opposite polarity is arranged at the center of each annular group and in a circle around the center; the primary advantage of the annular arrangement is that it can treat the largest area. By making full use of the space, it is ensured that the current and the electric field are evenly distributed in the area to be treated, without dead angle coverage, and the treatment efficiency is improved. More importantly, by precisely controlling the voltage value and its positive and negative properties, the annular arrangement is given extremely high flexibility. The operator can dynamically adjust the electric field distribution between the electrodes according to actual needs, thereby achieving a smooth conversion from the annular arrangement to other various arrangements. For example, when it is necessary to focus on the treatment of a specific area, the annular arrangement can be converted into a locally encrypted grid arrangement; when treating a flowing medium, it can be adjusted to a linear arrangement that matches the flow direction of the fluid. This flexible arrangement conversion capability not only improves the pertinence and efficiency of treatment, but also enhances the adaptability and resilience of the treatment solution.

[0085] The power supply system 100 is a portable power supply that can be connected to the voltage control system 200 via a cable. Its main function is to provide power support for the entire water-saving and environmentally friendly saline-alkali land salt reduction equipment. The system is composed of multiple modular batteries. The required voltage range, power range and capacity demand module quantity are determined according to the desalination area, desalination method and desalination time. It can be split into single modules for easy transportation, achieving miniaturization and lightweight characteristics. At the same time, in view of the characteristics of more electricity and less water in the northwest region, the charging source of the power supply system is mainly new energy (such as wind power, solar energy, etc.), as a new energy storage mode.

[0086] The voltage control system 200 can be connected to the electrolysis system 300 via a cable, and its main function is to control the positive and negative pole relationship of each electrode according to different desalination modes, and accurately control the voltage (between 0 and 36V in some embodiments) according to the preset program and sensor intelligent feedback. The voltage control system 200 includes a positive and negative pole relationship dynamic control system for controlling the positive and negative pole relationship of the electrolysis system 300, an integrated intelligent system for voltage value control according to the desalination scheme and historical data, and an intelligent feedback voltage control system for real-time monitoring of the actual output voltage of the battery and comparing and controlling it with the preset voltage setting value.

[0087] The data acquisition system 400 collects the voltage, current, temperature and usage rate of the ion exchange resin of the electrolysis system 300 through built-in sensors; and estimates the conductivity of the soil saturated mud extract based on the measured voltage drop and current between the positive and negative electrodes to determine the salt reduction effect of the saline-alkali land.

[0088] When traditional electrolysis is applied to saline-alkali land treatment, it often faces problems such as high energy consumption, long treatment cycle, and great damage to soil structure. The in-situ treatment system of the present invention achieves efficient capture and separation of ions by precisely controlling the electrolysis process, while avoiding additional burden on the soil. It can also be customized according to the specific conditions of the saline-alkali land (such as salt type, concentration, soil texture, etc.), and flexibly adjust the electrolysis parameters and adsorption material types to ensure the maximum treatment effect.

[0089] Therefore, by inserting the cathode and anode electrodes into the lower part of the main probe 310 according to the working mode requirements, arranging the electrolysis system 300 according to the working mode, and cooperating with the voltage control system 200, the corresponding ions are enriched and collected to achieve saline-alkali land treatment.

[0090] As another aspect of the present invention, it also relates to a saline-alkali land treatment method based on the electric drive principle, which is implemented by applying the saline-alkali land in-situ treatment system based on the electric drive capture and separation principle, and comprises the following steps:

[0091] S1, soil testing, select soil testing indicators according to GB / T 42828.3-2023 (the indicators are as follows), and test indicator parameters;

[0092]

[0093] S2, determine the impact range of desalination efficiency, test the desalination efficiency of the saline-alkali land in-situ treatment system based on the principle of electric drive capture and separation in the laboratory and on site, the test method is to take samples continuously at a fixed distance with the electrode 320 as the center after desalination, test the soil salinity, and compare with the original soil sample to determine the impact range of electrode desalination;

[0094] S3, determine the desalination scheme, and determine the electric drive desalination scheme and technical parameters according to the soil index parameters and the on-site status of the saline-alkali land, the technical parameters include the desalination area, the arrangement of the desalination electrodes, the desalination time and the desalination intensity, etc.;

[0095] S4, soil saturation operation, saturating the desalination area through irrigation, using water-saving irrigation methods such as drip irrigation and sprinkler irrigation;

[0096] S5, desalination operation, setting the working mode and voltage of the saline-alkali land in-situ treatment system based on the electric drive capture and separation principle according to the result in S3, and desalting the desalination area;

[0097] S6, desalination efficiency monitoring, estimates the conductivity of the soil saturated mud extract through the data (voltage drop and current, etc.) collected by the data acquisition system 400, and determines the desalination effect of saline-alkali land; the rating method refers to "General Technology for Saline-Alkali Land Improvement Part 3: Biological Improvement" (GB / T42828.3-2023), and the table is as follows:

[0098]

[0099] S7, cleaning and replacing the ion exchange resin, replacing the saturated ion exchange resin and restoring its adsorption performance through ultrasonic cleaning;

[0100] S8, biological treatment, after desalination, apply salt-alkali tolerant microbial fertilizers that meet the NY / T1535 standard, and plant crops; the microbial fertilizers, on the basis of meeting the NY / T1535 standard, select local suitable salt-alkali tolerant green manure varieties, such as alkali grass, sesbania, ryegrass, hairy vetch, alfalfa, etc.; and comprehensively consider the regional soil properties, salinity, climate zone type and crop salt tolerance, and select crop varieties or halophytes with strong salt tolerance.

[0101] S9, treatment and testing, after a set time, re-test the test indicators of the treated soil. If double salt phenomenon occurs, re-enter S3.

[0102] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An in-situ treatment system for saline-alkali land based on the principle of electric drive capture and separation, characterized in that: It comprises a power supply system (100), a voltage control system (200) connected to the power supply system (100), an electrolysis system (300) connected to the voltage control system (200), and a data acquisition system (400) connected to the upper part of the electrolysis system (300); The electrolysis system (300) comprises a main probe (310) at the top and a plurality of electrodes (320) movably connected to the bottom of the main probe (310), wherein the electrodes (320) are of two types, namely, a cathode electrode and an anode electrode, which are inserted into the saline-alkali land and are made of ion exchange resin; The electrolysis system (300) includes single-group electrode, double-group electrode and multiple-group electrode working modes; the double-group electrode and multiple-group electrode working modes include two ion-enriching electrode groups with opposite polarities, the two ion-enriching electrode groups with opposite polarities are respectively an anion-enriching electrode group (321-C) formed by inserting all the cathode electrodes under the main probe (310) and a cation-enriching electrode group (321-D) formed by inserting all the anode electrodes under the main probe (310); The multiple electrode groups working mode includes a ring arrangement, the ring arrangement includes at least one ring group, and the ion enrichment electrode group of opposite polarity is arranged at the center of each ring group and in a circle around the center; The cathode electrode and the anode electrode are inserted into the lower part of the main probe (310) according to the working mode requirements, and the electrolysis system (300) is arranged according to the working mode, and then coordinated with the voltage control system (200), the corresponding ions are enriched and collected.

2. The in-situ treatment system for saline-alkali land based on the principle of electric drive capture and separation according to claim 1 is characterized in that: The ion exchange resin is disassembled and its adsorption performance can be restored by ultrasonic cleaning.

3. The in-situ treatment system for saline-alkali land based on the principle of electric drive capture and separation according to claim 1 is characterized in that: The main probe (310) comprises, from top to bottom, an interface (311), a base (312) and several waterproof sockets (313); the voltage control system (200) and the data acquisition system (400) are both connected to the electrolysis system (300) via the interface (311); The waterproof socket (313) is arranged at the center below the base (312) and around the center; The waterproof socket (313) is connected to the electrode (320) at the bottom so as to transmit the voltage distributed by the voltage regulation system (200) to the electrode (320).

4. The in-situ treatment system for saline-alkali land based on the principle of electric drive capture and separation according to claim 3 is characterized in that: The cathode electrode and the anode electrode both include an insulating hard protective head (322) at the bottom and also include an anion-enriched electrode (321-A) and a cation-enriched electrode (321-B), respectively. The anion-enriched electrode (321-A) and the cation-enriched electrode (321-B) both include a joint arranged at the top and matching the waterproof socket (313) and a threaded area arranged at the bottom and matching the protective head (322).

5. The in-situ treatment system for saline-alkali land based on the principle of electric drive capture and separation according to claim 4 is characterized in that: The cation-enriched electrode (321-B) and the anion-enriched electrode (321-A) are both made of conductive carbon fiber. The cation-enriched electrode (321-B) has several enriched strips formed by cation exchange resin distributed around it; the anion-enriched electrode (321-A) is made of anion exchange resin.

6. The in-situ treatment system for saline-alkali land based on the principle of electric drive capture and separation according to claim 5 is characterized in that: The single-group electrode, double-group electrode and multiple-group electrode working modes can be used in a mixed manner and the operating range increases from small to large; The single-group electrode working mode includes only one main probe (310) and adopts a central ring arrangement mode, wherein the negative electrode and a plurality of positive electrodes or a positive electrode and a plurality of negative electrodes are respectively inserted into the waterproof socket (313) at the center of the base (312) and a circle around the center; The dual-group electrode working mode adopts a symmetrical arrangement, wherein one anion-enriching electrode group (321-C) and one cation-enriching electrode group (321-D) are arranged on both sides of the saline-alkali land respectively; The multi-electrode working mode includes a plurality of the total probes (310) and also includes linear and dual arrangements; The linear arrangement is to linearly cross-arrange the anion-enriched electrode group (321-C) and the cation-enriched electrode group (321-D); The dual arrangement includes several linear groups, wherein all the linear groups on a line are anion-enriched electrode groups (321-C) or cation-enriched electrode groups (321-D), wherein adjacent linear groups are ion-enriched electrode groups of opposite polarity.

7. The in-situ treatment system for saline-alkali land based on the principle of electric drive capture and separation according to claim 1 is characterized in that: The power system (100) comprises a plurality of detachable modular batteries.

8. The in-situ treatment system for saline-alkali land based on the principle of electric drive capture and separation according to claim 1 is characterized in that: The voltage control system (200) comprises an electrode positive-negative electrode relationship dynamic control system for controlling the positive-negative electrode relationship of the electrolysis system (300), an integrated intelligent system for voltage value control according to a desalination scheme and historical data, and an intelligent feedback voltage control system for real-time monitoring of the actual output voltage of the battery and comparing and controlling it with a preset voltage setting value.

9. The in-situ treatment system for saline-alkali land based on the principle of electric drive capture and separation according to claim 1 is characterized in that: The data acquisition system (400) collects the voltage, current, temperature and usage rate of the ion exchange resin of the electrolysis system (300) through built-in sensors; and estimates the conductivity of the soil saturated mud extract based on the measured voltage drop and current between the positive and negative electrodes to determine the salt reduction effect of the saline-alkali land.

10. A method for treating saline-alkali land based on the electric drive principle, which is implemented by using the saline-alkali land in-situ treatment system based on the electric drive capture and separation principle as described in claims 1-9, comprising the following steps: S1, soil testing, select soil testing indicators and test indicator parameters according to GB / T 42828.3-2023; S2, determining the impact range of desalination efficiency, testing the desalination efficiency of the saline-alkali land in-situ treatment system based on the principle of electric-driven capture and separation in the laboratory and on site, wherein the testing method is to continuously sample soil at a fixed distance with the electrode (320) as the center after desalination is completed, test the soil salinity, and compare the samples with the original soil samples to determine the impact range of electrode desalination; S3, determine the desalination scheme, and determine the electric drive desalination scheme and technical parameters according to the soil index parameters and the on-site status of the saline-alkali land; S4, soil saturation operation, saturating the desalination area through irrigation; S5, desalination operation, setting the working mode and voltage of the saline-alkali land in-situ treatment system based on the electric drive capture and separation principle according to the result in S3, and desalting the desalination area; S6, monitoring the desalination efficiency, estimating the conductivity of the soil saturated mud extract through the data collected by the data acquisition system (400), and determining the salt reduction effect of the saline-alkali land; S7, cleaning and replacing the ion exchange resin, replacing the saturated ion exchange resin and restoring its adsorption performance through ultrasonic cleaning; S8, biological treatment, after desalination, apply salt-alkali-tolerant microbial fertilizer that meets NY / T1535 standard and plant crops; S9, treatment and testing, after a set time, re-test the test indicators of the treated soil. If double salt phenomenon occurs, re-enter S3.

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