Water quality purification device and method suitable for urban garden landscape irrigation

Abstract

The invention provides a water quality purification device and method suitable for urban garden landscape irrigation, the water quality purification device comprises an ion exchange system, the ion exchange system comprises an ion exchange tank, and irrigation water to be purified stays in the ion exchange tank according to a set staying time; the strong-acid polymeric filler is arranged in the ion exchange tank, and a strong-acid reaction group of the strong-acid polymeric filler can be subjected to ion exchange reaction with salt ions in the irrigation water, so that the removal rate of the salt ions in the irrigation water is changed along with the set retention time; the removal rate of salt ions in the irrigation water can be manually controlled, so that the salt content in the irrigation water can provide trace essential nutrient elements for plants, and the growth of the plants is promoted to a certain extent, so that the purposes of maintaining the soil health and the normal growth of the plants are achieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of water purification, and more specifically, relates to a water purification device and method suitable for urban garden landscape irrigation. Background Art

[0002] With the continuous acceleration of urbanization, urban residents' demand for urban green spaces and a good ecological environment is increasing day by day. The urban greening rate has become an important indicator for evaluating the development level of a city. However, landscaping is also one of the industries with a large amount of water demand. Therefore, the quality of irrigation water directly affects the effect of landscaping and the health of the soil.

[0003] At present, the water sources used for garden greening irrigation in China mainly include conventional and unconventional water sources. Conventional water sources include tap water and groundwater, and unconventional water sources include recycled water, river and lake water, and rainfall water. With my country's emphasis on and protection of water resources, conventional water sources have basically withdrawn from the garden greening irrigation industry, and have been replaced by unconventional water sources; however, due to the characteristics of water quality and soil properties, the soil is prone to compaction after garden greening irrigation with unconventional water sources, and garden plants die due to water loss.

[0004] The main reason for the above problems is the salt in unconventional water. After irrigation, the salt in the water accumulates in the soil to form salt damage, resulting in poor soil permeability, and then hardening and plant death. At present, there is a blank in the literature on the removal of salt in garden irrigation water. The common industrial and domestic wastewater desalination processes are as follows:

[0005] Distillation: Distillation is a traditional water treatment desalination method that heats water to evaporate it and then condenses the vapor back into water. This method can remove most impurities and dissolved solids in water, but it consumes a lot of energy and is not suitable for treating large-scale water resources.

[0006] Reverse osmosis: Reverse osmosis is a modern water treatment and desalination method. It allows water to pass through a semipermeable membrane at high pressure, isolating the ions and impurities in the solution to obtain pure water. It has a very good treatment effect and can remove more than 99% of soluble solids and ions in water, but it requires pressurization from a high-pressure pump and has high energy consumption.

[0007] Electrodialysis: Electrodialysis is also a modern water treatment and desalination method. It uses the force of an electric field to separate ions and impurities in water to obtain pure water. Since the ion separation process of this method only consumes a small amount of electricity, the energy consumption is low, but it can only remove some ions and soluble substances in the water.

[0008] Flotation: Flotation is a physical treatment method that injects tiny bubbles into the water, causing them to carry impurities and particles in the water upward, thereby removing impurities from the water through surface skimming; this method is suitable for treating some minor pollutants dispersed in the water, but its removal effect is relatively weak. Summary of the invention

[0009] The purpose of the present invention is to provide a water purification device and method suitable for urban landscape irrigation in view of the deficiencies of the existing technology, so as to solve the problems mentioned in the above background technology that the existing wastewater desalination methods are high in cost and the salt ion removal rate cannot be controlled. The excessive removal of salt ions can easily lead to the irrigation water being unable to provide trace essential nutrients to plants. Therefore, too high or too low salt content in the irrigation water will lead to abnormal plant growth.

[0010] In order to achieve the above object, the present invention provides a water purification device suitable for urban garden landscape irrigation, the water purification device comprises an ion exchange system, and the ion exchange system comprises:

[0011] An ion exchange tank body, in which the irrigation water to be purified stays for a set stay time;

[0012] A strongly acidic polymer filler is arranged in the ion exchange tank, and the strongly acidic reaction groups of the strongly acidic polymer filler can undergo ion exchange reaction with salt ions in the irrigation water, so that the removal rate of the salt ions in the irrigation water varies with the length of the set residence time.

[0013] Preferably, the ion exchange system further comprises:

[0014] A multi-way control valve, wherein the multi-way control valve is arranged on the top of the ion exchange tank;

[0015] A central tube, wherein the central tube is disposed in the ion exchange tank, the bottom end of the central tube is inserted into the interior of the strongly acidic polymer filler, and the top end of the central tube is connected to the first valve port of the multi-way control valve;

[0016] An upper water distributor, the upper water distributor being connected to the second valve port of the multi-way control valve;

[0017] A lower water distributor, the lower water distributor is connected to the bottom end of the central tube, the irrigation water can enter the ion exchange tank through the upper water distributor, and can flow out through the lower water distributor and the central tube;

[0018] The first backwashing device, the output end of the first backwashing device is connected to the third valve port of the multi-way control valve, the backwashing liquid of the first backwashing device can enter the ion exchange tank body through the central pipe and the lower water distributor, and can flow out through the fourth valve port of the multi-way control valve.

[0019] Preferably, the strong acid polymer filler is a DPT-I type resin, and the strong acid polymer filler is arranged at the bottom of the ion exchange tank body, and the ratio of the height of the strong acid polymer filler to the height of the ion exchange tank body is 1:2.

[0020] Preferably, the first backwashing device comprises:

[0021] A first dosing bucket, wherein a backwash sulfuric acid solution is provided inside the first dosing bucket;

[0022] A first clean water tank, wherein backwash clean water is provided inside the first clean water tank.

[0023] Preferably, the water purification device suitable for urban garden landscape irrigation also includes a pre-treatment filtration system, which is connected to the ion exchange system, and the pre-treatment filtration system includes:

[0024] Booster pump;

[0025] A microporous membrane filter, wherein the input end of the microporous membrane filter is connected to the output end of the booster pump;

[0026] A sand and gravel filter, wherein the input end of the sand and gravel filter is connected to the output end of the microporous membrane filter.

[0027] Preferably, the water purification device suitable for urban garden landscape irrigation further comprises an adsorption system, the ion exchange system is connected to the adsorption system, and the adsorption system comprises:

[0028] Adsorption tank;

[0029] A quartz sand filler, wherein the quartz sand filler is arranged inside the adsorption tank body;

[0030] An activated carbon filler, wherein the activated carbon filler is arranged inside the adsorption tank body and on top of the quartz sand filler;

[0031] A second backwashing device, wherein the output end of the second backwashing device is connected to the input end of the adsorption tank.

[0032] The effluent from the ion exchange system enters the activated carbon filter through the automated multi-way valve on the adsorption tank, reacts with quartz sand and activated carbon, and is used to remove COD from irrigation water.

[0033] Preferably, the second backwashing device comprises:

[0034] A second dosing bucket, wherein a backwash ER-C type bacterial agent is arranged inside the second dosing bucket;

[0035] A second clean water tank, wherein backwash clean water is provided inside the second clean water tank.

[0036] A water purification method suitable for urban garden landscape irrigation, using a water purification device suitable for urban garden landscape irrigation, the water purification method comprising:

[0037] Collect soil from multiple locations within the landscape irrigation area and analyze the salt content of the soil;

[0038] Assess soil salt damage and divide landscape irrigation areas into non-polluted areas, potential polluted areas and polluted areas according to their pollution status;

[0039] For potential pollution areas and polluted areas, based on soil salt damage and existing irrigation water quality, the water quality-soil-plant multi-link irrigation configuration model calculation system is used to obtain the limit value of salt ion content in irrigation water;

[0040] The time for the irrigation water to stay in the ion exchange tank is set according to the limit value, so that the strongly acidic reaction groups and salt ions undergo ion exchange reaction according to the set residence time, so that the salt ion content in the irrigation water meets the limit value.

[0041] The time for the irrigation water to stay in the ion exchange tank is set according to the limit value, so that the strongly acidic reaction groups and salt ions undergo ion exchange reaction according to the set residence time, so that the salt ion content in the irrigation water meets the limit value.

[0042] Preferably, when the water purification device suitable for urban garden landscape irrigation further includes a pretreatment filtration system, and the pretreatment filtration system is connected to the ion exchange system, the method further includes: using the pretreatment filtration system to filter impurities and pollutants in the irrigation water.

[0043] Preferably, when the water purification device suitable for urban garden landscape irrigation further comprises an adsorption system, and the ion exchange system is connected to the adsorption system, the method further comprises: removing COD in the irrigation water by using the adsorption system.

[0044] The present invention provides a water purification device and method suitable for urban garden landscape irrigation, and the beneficial effect is that the strongly acidic reaction groups of the strongly acidic polymer filler of the water purification device can undergo ion exchange reaction with the salt ions in the irrigation water, so that the removal rate of the salt ions in the irrigation water varies with the length of the set residence time, and the removal rate of the salt ions in the irrigation water can be artificially controlled, so that the salt content in the irrigation water can provide trace essential nutrients to plants, and has a certain promoting effect on plant growth, so as to achieve the purpose of maintaining soil health and normal plant growth.

[0045] This water purification method can calculate the optimal salt ion content in irrigation water based on plant growth needs, and thus efficiently remove salt ions in urban landscape gardening irrigation water. At the same time, the salt ion content in the water can also ensure the normal growth needs of plants, thereby achieving the purpose of maintaining soil health and normal plant growth.

[0046] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] The above and other objects, features and advantages of the present invention will become more apparent through a more detailed description of exemplary embodiments of the present invention in conjunction with the accompanying drawings, wherein like reference numerals generally represent like components throughout the exemplary embodiments of the present invention.

[0048] Figure 1 A flow chart of a water purification method suitable for urban landscape irrigation according to an embodiment of the present invention is shown.

[0049] Figure 2 It shows a structural block diagram of a water purification device suitable for urban garden landscape irrigation according to an embodiment of the present invention;

[0050] Figure 3 A schematic structural diagram of an ion exchange system of a water purification device suitable for urban landscape irrigation according to an embodiment of the present invention is shown.

[0051] Description of reference numerals:

[0052] 1. Ion exchange tank; 2. Strong acid polymer filler; 3. Multi-way control valve; 4. Central pipe; 5. Upper water distributor; 6. Lower water distributor; 7. First backwash device; 8. Booster pump; 9. Microporous membrane filter; 10. Sand filter; 11. Adsorption tank; 12. Second backwash device; 13. Intermediate water tank; 14. Production water tank. DETAILED DESCRIPTION

[0053] The preferred embodiments of the present invention will be described in more detail below. Although the preferred embodiments of the present invention are described below, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0054] like Figure 2 As shown, the present invention provides a water purification device suitable for urban garden landscape irrigation, the water purification device comprises an ion exchange system, and the ion exchange system comprises:

[0055] An ion exchange tank 1, in which the irrigation water to be purified is retained for a set retention time;

[0056] The strongly acidic polymer filler 2 is arranged in the ion exchange tank 1. The strongly acidic reaction groups of the strongly acidic polymer filler 2 can undergo ion exchange reaction with the salt ions in the irrigation water, so that the removal rate of the salt ions in the irrigation water varies with the length of the set residence time.

[0057] Specifically, in order to solve the problems of high cost and uncontrollable salt ion removal rate of existing wastewater desalination methods, more salt ion removal can easily lead to the irrigation water being unable to provide trace essential nutrients to plants, so that too high or too low salt in the irrigation water will lead to abnormal plant growth. The present invention provides a water purification device suitable for urban landscape irrigation. The strongly acidic reaction groups of the strongly acidic polymer filler 2 of the water purification device can undergo ion exchange reactions with the salt ions in the irrigation water, so that the removal rate of the salt ions in the irrigation water varies with the length of the set residence time, and the salt ion removal rate in the irrigation water can be artificially controlled, so that the salt content in the irrigation water can provide trace essential nutrients to plants, which has a certain promoting effect on plant growth, so as to achieve the purpose of maintaining soil health and normal plant growth.

[0058] like Figure 3 As shown, preferably, the ion exchange system also includes:

[0059] A multi-way control valve 3, which is arranged on the top of the ion exchange tank 1;

[0060] A central tube 4 is disposed in the ion exchange tank 1, the bottom end of the central tube 4 is inserted into the interior of the strongly acidic polymer filler 2, and the top end of the central tube 4 is connected to the first valve port of the multi-way control valve 3;

[0061] The upper water distributor 5 is connected to the second valve port of the multi-way control valve 3;

[0062] A lower water distributor 6, which is connected to the bottom end of the central tube 4, and the irrigation water can enter the ion exchange tank 1 through the upper water distributor 5, and can flow out through the lower water distributor 6 and the central tube 4;

[0063] The first backwashing device 7, the output end of the first backwashing device 7 is connected to the third valve port of the multi-way control valve 3, the backwashing liquid of the first backwashing device 7 can enter the ion exchange tank body 1 through the central pipe 4 and the lower water distributor 6, and can flow out through the fourth valve port of the multi-way control valve 3.

[0064] Specifically, irrigation water can enter the upper water distributor 5 through the distribution of the multi-way control valve 3, and then enter the ion exchange tank 1 through the upper water distributor 5. The salt ions in the irrigation water will undergo ion exchange reaction with the strongly acidic reaction groups contained in the strongly acidic polymer filler 2. The residence time is set to 15-30 minutes to reduce the salt ions in the irrigation water. The removal rate is generally 45-75%, which has a certain promoting effect on plant growth.

[0065] Preferably, the strong acid polymer filler 2 is a DPT-I type resin, and the strong acid polymer filler 2 is arranged at the bottom of the ion exchange tank body 1, and the height ratio of the strong acid polymer filler 2 to the height of the ion exchange tank body 1 is 1:2.

[0066] Specifically, since DPT-I resin has a strongly acidic reactive group, it can efficiently exchange salt ions in irrigation water, thereby reducing the salt ion composition in the water. The salt ions are mainly low-valent ions such as sodium ions, chloride ions, and bicarbonate ions.

[0067] Preferably, the first backwashing device 7 comprises:

[0068] A first dosing bucket, wherein a backwash sulfuric acid solution is provided inside the first dosing bucket;

[0069] The first clean water tank has backwash clean water inside.

[0070] Specifically, according to the characteristics of DPT-I type resin, it is set to complete resin regeneration once every 15-30 days, and 4-5% backwash sulfuric acid solution is countercurrently entered into the ion exchange tank 1 for backwashing. The backwash residence time during the regeneration process is about 50-60 minutes, and then rinsed with clean water.

[0071] Preferably, the water purification device suitable for urban garden landscape irrigation also includes a pre-treatment filtration system, which is connected to the ion exchange system, and the pre-treatment filtration system includes:

[0072] Booster pump 8;

[0073] A microporous membrane filter 9, the input end of the microporous membrane filter 9 is connected to the output end of the booster pump 8;

[0074] The gravel filter 10 has an input end connected to an output end of the microporous membrane filter 9 .

[0075] Specifically, under the action of the booster pump 8, the irrigation water enters the pretreatment filtration system through the pipeline. The pretreatment filtration system includes a microporous membrane filter 9 and a sand and gravel filter 10. The microporous membrane filter 9 is used to remove impurities with a particle size of more than 100 μm, and the sand and gravel filter 10 is used to remove impurity pollutants such as suspended matter, particulate matter and colloids with a particle size of 50-100 μm, so as to prevent impurities from entering the soil through the irrigation water, blocking the soil pores and affecting the soil respiration rate.

[0076] Preferably, the water purification device suitable for urban garden landscape irrigation also includes an adsorption system, the ion exchange system is connected to the adsorption system, and the adsorption system includes:

[0077] Adsorption tank 11;

[0078] Quartz sand filler, which is arranged inside the adsorption tank body 11;

[0079] Activated carbon filler, which is arranged inside the adsorption tank 11 and on top of the quartz sand filler;

[0080] The second backwashing device 12 has an output end connected to an input end of the adsorption tank body 11 .

[0081] Specifically, after the quartz sand is soaked and cleaned, it is poured into the bottom of the adsorption tank body 11, the quartz sand filling height is 0.2-0.5m, as a support layer, the particle size is 10-0.5mm, and the adsorption tank body 11 is filled with granular activated carbon, the activated carbon filling height is 1.2-1.8m, as a filter layer, the particle size is 2.0-4.0mm.

[0082] Preferably, the second backwashing device 12 comprises:

[0083] A second dosing bucket, wherein the interior of the second dosing bucket is provided with a backwashing ER-C type bacterial agent;

[0084] A second clean water tank, wherein backwash clean water is arranged inside the second clean water tank.

[0085] Specifically, the adsorption tank that has reached the saturated state is connected to the second dosing bucket, and the ER-C type bacterial agent in the second dosing bucket and the saturated biochar decompose through the metabolites of the bacterial strains, so that the organic matter adsorbed on the activated carbon is degraded. Under the action of clean water elution, the adsorption sites on the surface of the activated carbon are activated, and the activated carbon recovers its adsorption performance and can be used again.

[0086] Preferably, an intermediate water tank 13 is connected between the ion exchange system and the adsorption system, and a production water tank 14 is connected to the adsorption system.

[0087] like Figure 1 As shown, a water purification method suitable for urban garden landscape irrigation uses a water purification device suitable for urban garden landscape irrigation. The water purification method includes:

[0088] Collect soil from multiple locations within the landscape irrigation area and analyze the salt content of the soil;

[0089] Assess soil salt damage and divide landscape irrigation areas into non-polluted areas, potential polluted areas and polluted areas according to their pollution status;

[0090] For potential pollution areas and polluted areas, based on soil salt damage and existing irrigation water quality, the water quality-soil-plant multi-link irrigation configuration model calculation system is used to obtain the limit value of salt ion content in irrigation water;

[0091] The time for the irrigation water to stay in the ion exchange tank is set according to the limit value, so that the strongly acidic reaction groups and salt ions undergo ion exchange reaction according to the set residence time, so that the salt ion content in the irrigation water meets the limit value.

[0092] The time for the irrigation water to stay in the ion exchange tank 1 is set according to the limit value, so that the strongly acidic reaction groups and the salt ions undergo ion exchange reaction according to the set residence time, so that the salt ion content in the irrigation water meets the limit value.

[0093] Specifically, when irrigating urban garden landscapes, an ecological safety risk assessment of urban garden landscape irrigation can be conducted. According to the W-type soil sampling method, soil is collected from five sites in the garden landscape irrigation area, and the salt content and low-price inorganic ion (sodium ion, chloride ion, bicarbonate ion, etc.) content are tested. The soil salinity is assessed and the soil is divided into unpolluted areas, potentially polluted areas and polluted areas according to the soil salt pollution situation.

[0094] Combined with the soil salt damage risk and irrigation water quality in the landscape irrigation area, the water quality-soil-plant multi-link irrigation configuration model calculation system is used to obtain the "water-soil-plant" salt balance ratio, and the maximum limit of the salt ion content in the irrigation water is calculated. Combined with the amount of anions and cations in the strong acid reaction-based resin, the corresponding water residence time is calculated, and then the salt ion content in the irrigation water is regulated and reduced.

[0095] Preferably, when the water purification device suitable for urban garden landscape irrigation further comprises a pre-treatment filtration system, and the pre-treatment filtration system is connected to the ion exchange system, the method further comprises: filtering fixed pollutants in the irrigation water by using the pre-treatment filtration system.

[0096] Preferably, when the water purification device suitable for urban garden landscape irrigation further comprises an adsorption system, and the ion exchange system is connected to the adsorption system, the method further comprises: removing COD in the irrigation water by using the adsorption system.

[0097] Example

[0098] The area of ​​a certain garden landscape irrigation plot is 3500m 2 , an ecological safety risk assessment was conducted on the land. According to the W-type soil sampling method, soil was collected from 5 sites in the irrigation area for testing. The soil pH was 8.5-9.1, total salt content was 1.1-1.5g / kg, water-soluble sodium ions were 120-130mg / kg, chloride ions were 150-180mg / kg, and bicarbonate ion content was 250-280mg / kg. It was assessed that the soil had been contaminated by salt damage; the irrigation water quality in the irrigation area had a pH of 9.05, TDS (total dissolved solids) of 892mg / kg, sodium absorption rate of 5.65, sodium ion content of 218mg / kg, chloride ion content of 115mg / kg, and bicarbonate ion content of 215mg / kg.

[0099] The processing method includes the following steps:

[0100] According to the soil salt damage and the existing irrigation water quality of the plot, the water quality-soil-plant multi-link irrigation configuration model calculation system was used to obtain the limit values ​​of the salt ion content in the irrigation water: pH 6-6.5, TDS 200-300mg / kg, sodium absorption rate 0-3, sodium ion content 50-100mg / kg, chloride ion content 50-100mg / kg, bicarbonate ion content 100-150mg / kg;

[0101] Combined with the amount of anions and cations in the strong acid reaction-based resin, the corresponding water retention time is calculated to be 18 minutes; the water enters the water purification device for urban garden landscape irrigation for water purification treatment;

[0102] Under the action of the booster pump, the irrigation water enters the pretreatment filtration system through the pipeline. The pretreatment filtration system includes a microporous membrane filter and a sand filter. After filtration, the water enters the upper water distributor through the distribution of the multi-way control valve. After entering the ion exchange tank through the upper water distributor, the salt separation ions of the irrigation water will undergo ion exchange reaction with the DPT-I type resin. The residence time is set to 18 minutes, and the resin filling height and the tank height are 1:2; after passing through the ion exchange system, the water enters the adsorption tank, where the quartz sand is soaked and cleaned, and then poured into the bottom of the adsorption tank. The quartz sand filling height is 0.3m and the particle size is 1.5mm. Then, granular activated carbon is poured into the adsorption tank. The activated carbon filling height is 1.4m as a filter layer with a particle size of 2mm. After passing through the adsorption tank, pure water is finally obtained, and its water quality is pH 6.2, TDS 218 mg / kg, sodium absorption rate 1.52, sodium ion content 72.8 mg / kg, chloride ion content 50.5 mg / kg, bicarbonate ion content 97.8 mg / kg, COD 15.9 mg / kg.

[0103] In summary, when the water purification method for urban landscape irrigation in this application uses this device, the water quality-soil-plant multi-link irrigation configuration model calculation system is used to calculate the salt and ion limits in the irrigation water, which can provide a technical reference for subsequent irrigation water salinity regulation and control, and can reduce the risk of green soil salinization caused by irrigation.

[0104] The present application adopts a pretreatment filtration system, an ion exchange system and an adsorption system to remove salt ions in irrigation water. Compared with traditional desalination methods (distillation, reverse osmosis, electrodialysis, flotation), the operating cost of the present application can be reduced by 35-65%, of which the cost of reagents can be reduced by more than 55%.

[0105] Studies have found that the salt ions in irrigation water need to be determined in combination with the amount of salt ions in the irrigation soil and the growth needs of plants to maintain the water-soil-plant salt ion balance. Traditional desalination methods (distillation, reverse osmosis, electrodialysis, flotation) can achieve a salt ion removal rate of more than 95%, which has a reverse effect on subsequent irrigation. However, the salt ion removal rate in irrigation water in this application is artificially controllable. Through model calculation, the removal rate is generally 45-75%, which has a certain promoting effect on plant growth.

[0106] This application has made two regeneration devices for the resin, activated carbon and quartz sand used, and is equipped with an automatic multi-way valve, which can play a role in regular backwashing. The backwashing cycle is about 1-2 times / month, during which time it can be unattended, reducing the frequency of manual operations, and reducing labor costs by more than 50%.

[0107] This application can provide a new solution for the refined management of garden irrigation. Compared with traditional irrigation methods, the risk of soil salinization is reduced by 70-85%, and the plant survival rate is increased by 55-95%, which can promote the sustainable development of garden irrigation.

[0108] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A water purification device suitable for urban garden landscape irrigation, characterized in that: The water purification device comprises an ion exchange system, and the ion exchange system comprises: An ion exchange tank body, in which the irrigation water to be purified stays for a set stay time; A strongly acidic polymer filler is arranged in the ion exchange tank, and the strongly acidic reaction groups of the strongly acidic polymer filler can undergo ion exchange reaction with salt ions in the irrigation water, so that the removal rate of the salt ions in the irrigation water varies with the length of the set residence time.

2. A water purification device suitable for urban garden landscape irrigation according to claim 1, characterized in that: The ion exchange system also includes: A multi-way control valve, wherein the multi-way control valve is arranged on the top of the ion exchange tank; A central tube, wherein the central tube is disposed in the ion exchange tank, the bottom end of the central tube is inserted into the interior of the strongly acidic polymer filler, and the top end of the central tube is connected to the first valve port of the multi-way control valve; An upper water distributor, the upper water distributor being connected to the second valve port of the multi-way control valve; A lower water distributor, the lower water distributor is connected to the bottom end of the central tube, the irrigation water can enter the ion exchange tank through the upper water distributor, and can flow out through the lower water distributor and the central tube; The first backwashing device, the output end of the first backwashing device is connected to the third valve port of the multi-way control valve, the backwashing liquid of the first backwashing device can enter the ion exchange tank body through the central pipe and the lower water distributor, and can flow out through the multi-way control valve.

3. A water purification device suitable for urban garden landscape irrigation according to claim 1, characterized in that: The strong acid polymer filler is a DPT-I type resin, and the strong acid polymer filler is arranged at the bottom of the ion exchange tank body. The ratio of the height of the strong acid polymer filler to the height of the ion exchange tank body is 1:

2.

4. A water purification device suitable for urban garden landscape irrigation according to claim 2, characterized in that: The first backwashing device comprises: A first dosing bucket, wherein a backwash sulfuric acid solution is provided inside the first dosing bucket; A first clean water tank, wherein backwash clean water is provided inside the first clean water tank.

5. A water purification device suitable for urban garden landscape irrigation according to claim 1, characterized in that: The water purification device suitable for urban garden landscape irrigation also includes a pre-treatment filtration system, which is connected to the ion exchange system, and the pre-treatment filtration system includes: Booster pump; A microporous membrane filter, wherein the input end of the microporous membrane filter is connected to the output end of the booster pump; A gravel filter, wherein the input end of the gravel filter is connected to the output end of the microporous membrane filter.

6. A water purification device suitable for urban garden landscape irrigation according to claim 1, characterized in that: The water purification device suitable for urban garden landscape irrigation also includes an adsorption system, the ion exchange system is connected to the adsorption system, and the adsorption system includes: Adsorption tank; A quartz sand filler, wherein the quartz sand filler is arranged inside the adsorption tank body; An activated carbon filler, wherein the activated carbon filler is arranged inside the adsorption tank body and on top of the quartz sand filler; A second backwashing device, wherein the output end of the second backwashing device is connected to the input end of the adsorption tank.

7. A water purification device suitable for urban garden landscape irrigation according to claim 6, characterized in that: The second backwashing device comprises: A second dosing bucket, wherein a backwash ER-C type bacterial agent is arranged inside the second dosing bucket; A second clean water tank, wherein backwash clean water is provided inside the second clean water tank.

8. A water purification method suitable for urban garden landscape irrigation, using a water purification device suitable for urban garden landscape irrigation according to any one of claims 1 to 7, characterized in that: The water purification method includes: Collect soil from multiple locations within the landscape irrigation area and analyze the salt content of the soil; Assess soil salt damage and divide landscape irrigation areas into non-polluted areas, potential polluted areas and polluted areas according to their pollution status; For potential pollution areas and polluted areas, based on soil salt damage and existing irrigation water quality, the water quality-soil-plant multi-link irrigation configuration model calculation system is used to obtain the limit value of salt ion content in irrigation water; The time for the irrigation water to stay in the ion exchange tank is set according to the limit value, so that the strongly acidic reaction groups and the salt ions undergo ion exchange reaction according to the set residence time, so that the salt ion content in the irrigation water meets the limit value.

9. A water purification method suitable for urban garden landscape irrigation according to claim 8, characterized in that: When the water purification device suitable for urban garden landscape irrigation also includes a pre-treatment filtration system, and the pre-treatment filtration system is connected to the ion exchange system, the method further includes: using the pre-treatment filtration system to filter impurities and pollutants in the irrigation water.

10. A water purification method suitable for urban garden landscape irrigation according to claim 8, characterized in that: When the water purification device suitable for urban garden landscape irrigation further includes an adsorption system, and the ion exchange system is connected to the adsorption system, the method further includes: removing COD in the irrigation water by using the adsorption system.

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