A chemical water treatment system and method

Abstract

The application discloses a chemical water treatment system and method, which comprises a raw water tank (1), a steam heat exchanger (2), an activated carbon filter (3), a first filter (4), a second filter (5), an ultrafiltration device (6), a first reverse osmosis device (7), a second reverse osmosis device (8), an ion exchanger (9) and a desalted water tank (10). The system controls the temperature of raw water at an optimal working condition through the steam heat exchanger, removes organic matters from the source efficiently through the activated carbon filter, adopts a multi-stage pretreatment combination of activated carbon+two-stage filtration+ultrafiltration, effectively protects the subsequent membrane system and reduces the pollution load; adopts a deep desalination combination of 'two-stage reverse osmosis+ion exchange', and the desalination depth and water quality stability are superior to those of the single-stage reverse osmosis or two-stage reverse osmosis ion exchange process in the prior art, so that the stable preparation of high-purity desalted water can be realized.

Description

Technical Field

[0001] This invention relates to the field of industrial water treatment technology, and in particular to a chemical water treatment system and method. Background Technology

[0002] In industrial production processes, the purity of boiler feedwater and industrial demineralized water directly determines the operational safety, service life, and product quality of production equipment. Existing chemical water treatment systems, in practical applications for producing high-purity demineralized water, generally suffer from the following prominent technical problems due to process design flaws, making it difficult to meet the demands of high-end industrial water: 1) Raw water temperature fluctuates greatly and has poor adaptability to low temperature: The raw water temperature fluctuates significantly with seasonal and environmental changes. When the temperature is below 15℃, the reverse osmosis membrane flux will decrease significantly as the temperature decreases, resulting in insufficient demineralized water production, which cannot meet the continuous water supply needs of industries in winter or low-temperature areas. 2) Weak pretreatment effect and prominent membrane fouling problem: Conventional pretreatment processes do not completely remove suspended solids and colloids in water, which easily causes fouling on the surface of ultrafiltration and reverse osmosis membranes, resulting in a rapid increase in system pressure difference and excessively high membrane cleaning frequency, which seriously affects the continuous operation efficiency of the system. 3) Lack of organic matter removal, resulting in significant pollution risks: When the organic matter content in the water is high, conventional processes do not have a dedicated organic matter removal unit. Organic matter is easily adsorbed onto the surface of the reverse osmosis membrane, causing irreversible fouling. At the same time, it can lead to organic matter poisoning of the ion exchange resin, reducing the resin exchange capacity by more than 30% and shortening the regeneration cycle to 2-3 times per month, significantly increasing operation and maintenance costs. 4) Insufficient desalination depth and poor water quality stability: The desalination efficiency of single-stage or simple two-stage desalination processes is limited, the effluent water quality fluctuates greatly, and the conductivity is difficult to stabilize below 10μS / cm, which cannot meet the stringent requirements of industries such as high-pressure boilers and precision electronics for high-purity desalinated water. 5) Poor operating economy: Frequent membrane fouling and multiple resin regenerations shorten the replacement cycle of reverse osmosis membranes to 1.5 to 2 years and the replacement cycle of ion exchange resins to 3 to 5 years. At the same time, the cleaning and regeneration process consumes a lot of water resources, electricity and chemical agents, resulting in high overall system operation and maintenance costs. Summary of the Invention

[0003] The purpose of this invention is to provide a chemical water treatment system and method that at least partially solves the aforementioned problems of the prior art.

[0004] To achieve the above objectives, the present invention provides a chemical water treatment system, comprising a raw water tank 1, a steam heat exchanger 2, an activated carbon filter 3, a first filter 4, a second filter 5, an ultrafiltration device 6, a first-stage reverse osmosis device 7, a second-stage reverse osmosis device 8, an ion exchanger 9, and a demineralized water tank 10. The raw water tank 1 is used to store the raw water that needs to be treated, and the outlet of the raw water tank 1 is connected to the steam heat exchanger 2. The steam heat exchanger 2 uses saturated steam heat exchange and is equipped with a temperature sensor and an automatic regulating valve to stably control the raw water temperature at 20-25℃; the outlet of the steam heat exchanger 2 is connected to the activated carbon filter 3. The activated carbon filter 3 is filled with columnar granular activated carbon for adsorbing and removing organic matter; the activated carbon filter 3 is sequentially connected to the first filter 4, the second filter 5, and the ultrafiltration device 6; The first filter 4 includes a quartz sand filter, and the second filter 5 includes a security filter. The first filter 4 and the second filter 5 are used to remove suspended solids, particulate impurities and activated carbon powder in stages. The ultrafiltration device 6 uses a hollow fiber ultrafiltration membrane, and the product water outlet of the ultrafiltration device 6 is connected in sequence to the first-stage reverse osmosis device 7 and the second-stage reverse osmosis device 8. The primary reverse osmosis unit 7 uses a polyamide composite reverse osmosis membrane, and the secondary reverse osmosis unit 8 uses a low-pressure polyamide composite membrane; the outlet of the secondary reverse osmosis unit 8 is connected to the ion exchanger 9. The ion exchanger 9 uses a mixed bed of cation and anion exchange resins, and its outlet is connected to the demineralized water tank 10.

[0005] Preferably, the columnar granular activated carbon has a particle size of 2-4 mm, a specific surface area of ​​≥1000 m² / g, an iodine adsorption value of ≥800 mg / g, and a filtration rate of 10-15 m / h.

[0006] Preferably, the quartz sand in the quartz sand filter has a particle size of 0.5 to 1.2 mm.

[0007] Preferably, the filter element of the security filter is a 5μm pleated filter element.

[0008] Preferably, the hollow fiber ultrafiltration membrane has a molecular weight cutoff of ≥10000 Da and a SDI removal rate of ≥95%.

[0009] Preferably, the polyamide composite reverse osmosis membrane has a desalination rate of ≥98% and an operating pressure of 1.2 to 1.5 MPa.

[0010] Preferably, the low-pressure polyamide composite membrane has a desalination rate of ≥99.5% and an operating pressure of 0.8~1.0MPa.

[0011] Preferably, in the cation-anion exchange resin mixed bed, the cation resin is a strongly acidic styrene-based cation exchange resin with an exchange capacity ≥ 4.5 mmol / g; the anion resin is a strongly basic styrene-based anion exchange resin with an exchange capacity ≥ 1.0 mmol / g, and the filling ratio of cation resin to anion resin is 1:2.

[0012] Preferably, the temperature sensor has an accuracy of ±0.5℃, and the automatic regulating valve is used to automatically control the steam flow rate based on the water temperature monitoring data of the temperature sensor, so as to stably control the raw water temperature at 20~25℃.

[0013] The present invention also provides a chemical water treatment method applied to the system provided in the above aspects and any preferred embodiment thereof, the method comprising: The raw water stored in the raw water tank 1 is input into the steam heat exchanger 2, and the temperature of the raw water is controlled to be 20-25°C under the regulation of the temperature sensor and the automatic regulating valve. The raw water in the steam heat exchanger 2 is fed into the activated carbon filter 3 to adsorb and remove organic matter, residual chlorine and color. The raw water filtered by the activated carbon filter 3 is passed sequentially through the first filter 4 and the second filter 5 to remove particulate impurities and activated carbon powder. The ultrafiltration device 6 receives the raw water filtered by the first filter 4 and the second filter 5, and retains colloids, microorganisms and fine particles, controlling the SDI of the effluent to be ≤3. The filtered water output from the ultrafiltration device 6 is sequentially passed through the first-stage reverse osmosis device 7 and the second-stage reverse osmosis device 8 to perform desalination treatment; The ion exchanger 9 receives water desalinated by the first-stage reverse osmosis unit 7 and the second-stage reverse osmosis unit 8, removes residual trace ions, and controls the effluent conductivity to be ≤5μS / cm, hardness to be ≤0.03mmol / L, and silica to be ≤20μg / L. The water treated by the ion exchanger 9 is fed into the demineralized water tank 10.

[0014] Compared with the prior art, the present invention has at least the following advantages: In this invention, a steam heat exchanger is used to stably control the raw water temperature at optimal operating conditions. An activated carbon filter efficiently removes organic matter from the source. A multi-stage pretreatment combination of "activated carbon + two-stage filtration + ultrafiltration" effectively protects the subsequent membrane system and reduces the fouling load. A deep desalination combination of "two-stage reverse osmosis + ion exchange" is employed, achieving superior desalination depth and water quality stability compared to existing single-stage or dual-stage reverse osmosis processes without ion exchange. This enables the stable production of high-purity desalinated water. The system exhibits strong overall synergy, with each unit working in concert. While improving effluent quality and operational stability, it significantly reduces maintenance costs, offering superior economic benefits and practicality, making it more suitable for large-scale industrial application. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of a chemical water treatment system provided in Embodiment 1 of the present invention.

[0016] Figure 2 This is a schematic flowchart of a chemical water treatment method provided in Embodiment 4 of the present invention. Detailed Implementation

[0017] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0018] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be used interchangeably where appropriate to understand the embodiments of the invention described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a product or device comprising a series of units is not necessarily limited to those explicitly listed, but may include other units not explicitly listed or inherent to such product or device.

[0019] In this invention, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing the invention and its embodiments, and are not intended to limit the indicated devices, elements, or components to having a specific orientation, or to be constructed and operated in a specific orientation.

[0020] Furthermore, in addition to indicating direction or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in certain situations to indicate a dependency or connection. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0021] Furthermore, the terms "installation," "setup," "equipped with," "connection," "linking," and "socketing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0022] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments. Example 1

[0023] This invention provides a chemical water treatment system. Figure 1 A schematic diagram of the system is shown. (Reference) Figure 1 As shown, the system includes a raw water tank 1, a steam heat exchanger 2, an activated carbon filter 3, a first filter 4, a second filter 5, an ultrafiltration device 6, a first-stage reverse osmosis device 7, a second-stage reverse osmosis device 8, an ion exchanger 9, and a demineralized water tank 10.

[0024] The raw water tank 1 is used to store the raw water to be treated, and its outlet is connected to the steam heat exchanger 2. The raw water enters the raw water tank for storage and homogenization. A stirring device is used to achieve uniformity in water quality and flow rate, stabilize the influent flow rate and water quality, and prevent subsequent treatment units from being affected by fluctuations in influent water, thus ensuring continuous and stable subsequent treatment.

[0025] The steam heat exchanger 2 uses saturated steam heat exchange and is equipped with a temperature sensor and an automatic regulating valve to stably control the raw water temperature at 20-25℃. The outlet of the steam heat exchanger 2 is connected to the activated carbon filter 3. In a preferred embodiment, the temperature sensor has an accuracy of ±0.5℃, and the automatic regulating valve is used to automatically control the steam flow rate based on the water temperature monitoring data from the temperature sensor, thus stabilizing the raw water temperature at 20-25℃. The raw water is heated by the steam heat exchanger, and the automatic temperature regulation system stabilizes the water temperature at 20-25℃, reducing water viscosity, increasing membrane treatment flux and filtration efficiency, improving overall demineralized water production, and solving the problem of insufficient water production under low-temperature conditions.

[0026] The activated carbon filter 3 is filled with columnar granular activated carbon for adsorbing and removing organic matter. The activated carbon filter 3 is sequentially connected to the first filter 4, the second filter 5, and the ultrafiltration device 6. In a preferred embodiment, the columnar granular activated carbon has a particle size of 2-4 mm, a specific surface area ≥1000 m² / g, an iodine adsorption value ≥800 mg / g, and a filtration rate of 10-15 m / h. Heated raw water enters the activated carbon filter, where the porous structure of the activated carbon efficiently removes organic matter, color, residual chlorine, odor, and some small molecule colloids from the water, reducing organic pollution at the source, preventing organic fouling of the reverse osmosis membrane and organic poisoning of the ion exchange resin, and extending the service life of the membrane and resin.

[0027] The first filter 4 includes a quartz sand filter, and the second filter 5 includes a security filter. The first filter 4 and the second filter 5 are used to remove suspended solids, particulate impurities, and activated carbon shed powder in a step-by-step manner. In a preferred embodiment, the quartz sand particle size of the quartz sand filter is 0.5–1.2 mm. In a preferred embodiment, the filter element of the security filter is a 5 μm pleated filter element. Water treated with activated carbon passes sequentially through the first filter (quartz sand filter) and the second filter (security filter), removing suspended solids, particulate impurities, and activated carbon shed powder in a step-by-step manner, preventing scratches and clogging of subsequent ultrafiltration and reverse osmosis membranes, and ensuring stable operation of the membrane system.

[0028] The ultrafiltration device 6 employs a hollow fiber ultrafiltration membrane, and its product water outlet is sequentially connected to the primary reverse osmosis device 7 and the secondary reverse osmosis device 8. In a preferred embodiment, the hollow fiber ultrafiltration membrane has a molecular weight cutoff ≥10000 Da and a solids indicative water (SDI) removal rate ≥95%. The ultrafiltration device further removes colloids, microorganisms, macromolecular organic matter, and fine particles from the water, controlling the effluent SDI to ≤3, reducing the fouling load on subsequent reverse osmosis devices, ensuring the reverse osmosis feed water quality meets standards, and improving the operational stability of the reverse osmosis system.

[0029] The primary reverse osmosis unit 7 uses a polyamide composite reverse osmosis membrane, and the secondary reverse osmosis unit 8 uses a low-pressure polyamide composite membrane; the outlet of the secondary reverse osmosis unit 8 is connected to the ion exchanger 9. In a preferred embodiment, the desalination rate of the polyamide composite reverse osmosis membrane is ≥98%, and the operating pressure is 1.2–1.5 MPa; the desalination rate of the low-pressure polyamide composite membrane is ≥99.5%, and the operating pressure is 0.8–1.0 MPa. The ultrafiltration permeate undergoes primary and secondary reverse osmosis to remove most dissolved salts, hardness, silica, and some residual organic matter. Primary reverse osmosis removes more than 98% of the salts, and secondary reverse osmosis further increases the desalination rate to over 99.5%, significantly reducing the operating load of the subsequent ion exchanger and decreasing the frequency of resin regeneration.

[0030] The ion exchanger 9 employs a mixed bed of cation and anion exchange resins, with its outlet connected to the demineralized water tank 10. In a preferred embodiment, the cation exchange resin in the mixed bed is a strongly acidic styrene-based cation exchange resin with an exchange capacity ≥4.5 mmol / g; the anion exchange resin is a strongly basic styrene-based anion exchange resin with an exchange capacity ≥1.0 mmol / g, and the filling ratio of cation to anion resin is 1:2. Secondary reverse osmosis permeate enters the ion exchanger (mixed bed), where the ion exchange between the cation and anion exchange resins deeply removes residual trace ions, weak electrolytes, and silica, ensuring that the effluent conductivity is ≤5 μS / cm, hardness is ≤0.03 mmol / L, and silica is ≤20 μg / L, achieving high-purity demineralized water standards.

[0031] The demineralized water tank 10 stores qualified demineralized water for supplying other water uses. The tank is equipped with an automatic level control device. When the level is lower than the set value, the system automatically starts the water replenishment process to meet the continuous water demand of subsequent boilers or process systems.

[0032] In this invention, a steam heat exchanger is used to stably control the raw water temperature at optimal operating conditions. An activated carbon filter efficiently removes organic matter from the source. A multi-stage pretreatment combination of "activated carbon + two-stage filtration + ultrafiltration" effectively protects the subsequent membrane system and reduces the fouling load. A deep desalination combination of "two-stage reverse osmosis + ion exchange" is employed, achieving superior desalination depth and water quality stability compared to existing single-stage or dual-stage reverse osmosis processes without ion exchange. This enables the stable production of high-purity desalinated water. The system exhibits strong overall synergy, with each unit working in concert. While improving effluent quality and operational stability, it significantly reduces maintenance costs, offering superior economic benefits and practicality, making it more suitable for large-scale industrial application. Example 2

[0033] This embodiment provides a chemical water treatment system, which differs from the chemical water treatment system in Embodiment 1 in that: an electric heater is used instead of a steam heat exchanger to regulate the raw water temperature; an ozone oxidation device is used instead of an activated carbon filter to degrade organic matter in the water through the strong oxidizing properties of ozone, thereby achieving the purpose of removing organic matter; the structure and function of other components, such as two-stage filtration, ultrafiltration, two-stage reverse osmosis, ion exchanger, demineralized water tank, etc., are the same as in Embodiment 1.

[0034] In this embodiment, ozone oxidation of organic matter has a fast reaction rate and can degrade some large molecular organic matter that is difficult to be adsorbed by activated carbon. The organic matter removal rate is comparable to that of activated carbon filters (≥85%). The electric heater has high temperature control accuracy and can flexibly adjust the water temperature to adapt to raw water with different temperature requirements. Example 3

[0035] This embodiment provides a chemical water treatment system, which differs from the chemical water treatment system in Embodiment 1 in that a "nanofiltration device" replaces the "first filter, second filter, first-stage reverse osmosis device, and second-stage reverse osmosis device". Through the retention effect of the nanofiltration membrane, organic matter removal and partial desalination are achieved simultaneously, and then a deep desalination is carried out in conjunction with an ion exchanger. The design of other components, such as temperature regulation (steam heat exchanger) and front-end organic matter removal (activated carbon filter), is the same as in Embodiment 1.

[0036] In this embodiment, the nanofiltration membrane can simultaneously retain organic matter and some salts, which can reduce the number of pretreatment and desalination units and make the system structure relatively simple; it is better than the reverse osmosis membrane for removing medium molecular weight organic matter, and can reduce organic pollution to a certain extent. Example 4

[0037] Based on the same technical concept as in Example 1, this embodiment of the invention provides a chemical water treatment method, which is applied to the system provided in Example 1 and any of its preferred embodiments. For specific implementation details, please refer to the specific description in Example 1, which will not be repeated here. Figure 2 A flowchart illustrating this method is shown. (Reference) Figure 2 As shown, the method includes: Step 201: Input the raw water stored in the raw water tank into the steam heat exchanger. Under the regulation of the temperature sensor and the automatic regulating valve, control the temperature of the raw water to 20-25℃.

[0038] Step 202: Input the raw water in the steam heat exchanger into the activated carbon filter to adsorb and remove organic matter, residual chlorine and color.

[0039] Step 203: The raw water filtered by the activated carbon filter is passed through the first filter and the second filter in sequence to remove particulate impurities and activated carbon powder.

[0040] Step 204: Receive the raw water filtered by the first and second filters through an ultrafiltration device, retaining colloids, microorganisms and fine particles, and controlling the effluent SDI ≤ 3.

[0041] Step 205: The filtered water output from the ultrafiltration device is passed sequentially through a primary reverse osmosis device and a secondary reverse osmosis device to perform desalination treatment.

[0042] Step 206: Receive the desalinated water from the first-stage and second-stage reverse osmosis units through an ion exchanger to remove residual trace ions and control the effluent conductivity to ≤5μS / cm, hardness to ≤0.03mmol / L, and silica to ≤20μg / L.

[0043] Step 207: Input the water treated by the ion exchanger into the demineralized water tank.

[0044] Compared with the prior art, the present invention has at least the following advantages: In this invention, a steam heat exchanger is used to stably control the raw water temperature at optimal operating conditions. An activated carbon filter efficiently removes organic matter from the source. A multi-stage pretreatment combination of "activated carbon + two-stage filtration + ultrafiltration" effectively protects the subsequent membrane system and reduces the fouling load. A deep desalination combination of "two-stage reverse osmosis + ion exchange" is employed, achieving superior desalination depth and water quality stability compared to existing single-stage or dual-stage reverse osmosis processes without ion exchange. This enables the stable production of high-purity desalinated water. The system exhibits strong overall synergy, with each unit working in concert. While improving effluent quality and operational stability, it significantly reduces maintenance costs, offering superior economic benefits and practicality, making it more suitable for large-scale industrial application.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Those skilled in the art should understand that modifications can be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A chemical water treatment system, characterized in that, It includes a raw water tank (1), a steam heat exchanger (2), an activated carbon filter (3), a first filter (4), a second filter (5), an ultrafiltration device (6), a first-stage reverse osmosis device (7), a second-stage reverse osmosis device (8), an ion exchanger (9), and a demineralized water tank (10). The raw water tank (1) is used to store the raw water that needs to be treated, and the outlet of the raw water tank (1) is connected to the inlet of the steam heat exchanger (2). The steam heat exchanger (2) uses saturated steam heat exchange and is equipped with a temperature sensor and an automatic regulating valve to stably control the raw water temperature at 20-25℃; the outlet of the steam heat exchanger (2) is connected to the activated carbon filter (3). The activated carbon filter (3) is filled with columnar granular activated carbon to adsorb and remove organic matter from the water; the outlet of the activated carbon filter (3) is connected in sequence to the first filter (4), the second filter (5), and the ultrafiltration device (6). The first filter (4) includes a quartz sand filter, and the second filter (5) includes a security filter. The first filter (4) and the second filter (5) are used to remove suspended solids, particulate impurities and activated carbon powder in stages. The ultrafiltration device (6) uses a hollow fiber ultrafiltration membrane, and the product water outlet of the ultrafiltration device (6) is connected in sequence to the first-stage reverse osmosis device (7) and the second-stage reverse osmosis device (8). The primary reverse osmosis unit (7) uses a polyamide composite reverse osmosis membrane, and the secondary reverse osmosis unit (8) uses a low-pressure polyamide composite reverse osmosis membrane; the outlet of the secondary reverse osmosis unit (8) is connected to the ion exchanger (9). The ion exchanger (9) uses a mixed bed of cation and anion exchange resins, and its outlet is connected to the demineralized water tank (10).

2. The chemical water treatment system according to claim 1, characterized in that, The columnar granular activated carbon has a particle size of 2-4 mm, a specific surface area of ​​≥1000 m² / g, an iodine adsorption value of ≥800 mg / g, and a filtration rate of 10-15 m / h.

3. The chemical water treatment system according to claim 1, characterized in that, The quartz sand filter has a quartz sand particle size of 0.5–1.2 mm.

4. The chemical water treatment system according to claim 1, characterized in that, The security filter element is a 5μm pleated filter element.

5. The chemical water treatment system according to claim 1, characterized in that, The hollow fiber ultrafiltration membrane has a molecular weight cutoff of ≥10000 Da and a fouling index (SDI) removal rate of ≥95%.

6. The chemical water treatment system according to claim 1, characterized in that, The polyamide composite reverse osmosis membrane has a desalination rate of ≥98% and an operating pressure of 1.2~1.5MPa.

7. The chemical water treatment system according to claim 1, characterized in that, The low-pressure polyamide composite reverse osmosis membrane has a desalination rate of ≥99.5% and an operating pressure of 0.8~1.0MPa.

8. The chemical water treatment system according to claim 1, characterized in that, The cation exchange resin in the mixed bed of cation and anion exchange resins is a strongly acidic styrene-based cation exchange resin with an exchange capacity ≥4.5 mmol / g; the anion exchange resin is a strongly basic styrene-based anion exchange resin with an exchange capacity ≥1.0 mmol / g, and the filling ratio of cation resin to anion resin is 1:

2.

9. The chemical water treatment system according to claim 1, characterized in that, The temperature sensor has an accuracy of ±0.5℃, and the automatic regulating valve is used to automatically control the steam flow rate based on the water temperature monitoring data of the temperature sensor, so as to stably control the raw water temperature at 20~25℃.

10. A chemical water treatment method, applied to the system according to any one of claims 1-9, characterized in that, The method includes: The raw water stored in the raw water tank (1) is input into the steam heat exchanger (2), and the temperature of the raw water is controlled to be 20-25°C under the regulation of the temperature sensor and the automatic regulating valve. The raw water in the steam heat exchanger (2) is fed into the activated carbon filter (3) to adsorb and remove organic matter, residual chlorine and color; The raw water filtered by the activated carbon filter (3) is passed sequentially through the first filter (4) and the second filter (5) to remove suspended solids, particulate impurities and activated carbon powder; The ultrafiltration device (6) receives the raw water filtered by the first filter (4) and the second filter (5), retains colloids, microorganisms and fine particles, and controls the effluent SDI≤3; The filtered water output from the ultrafiltration device (6) is sequentially passed through the first-stage reverse osmosis device (7) and the second-stage reverse osmosis device (8) to perform desalination treatment; The ion exchanger (9) receives water desalinated by the first-stage reverse osmosis device (7) and the second-stage reverse osmosis device (8), removes residual trace ions, and controls the effluent conductivity to be ≤5μS / cm, hardness to be ≤0.03mmol / L, and silica to be ≤20μg / L. The water treated by the ion exchanger (9) is fed into the demineralized water tank (10).

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