System and method suitable for granulation crystal water treatment

Abstract

The invention discloses a system and a method suitable for granulating and crystallizing water treatment. The system comprises a granulating and crystallizing reactor, a raw water tank and a new seed crystal adding device, the raw water tank and the new seed crystal adding device are connected with the granulation and crystallization reactor; an upper water distributor and a water and chemical distribution device positioned below the upper water distributor are mounted in the granulation and crystallization reactor in a matching manner; the water and chemical distribution device comprises a lower water distribution plate, an upper water distribution plate, a water distribution cap and a chemical distribution cap; the lower water distribution plate is positioned at the bottom end of the granulation and crystallization reactor, the upper water distribution plate is positioned at the upper part of the lower water distribution plate, the water distribution cap penetrates through the upper water distribution plate and the lower water distribution plate, and the liquid water distribution cap penetrates through the upper water distribution plate. By arranging the double-layer water and medicine distribution plate, a homogeneous crystallization behavior caused by pre-contact of a medicine and raw water before reaching a seed crystal bed layer is prevented, the crystallization efficiency and the seed crystal growth speed are enhanced, the device is suitable for a granulation and crystallization removal technology of pollutants containing hardness, heavy metals, phosphorus and the like, the operation stability of a granulation and crystallization reactor can be improved, and the production cost is reduced. The medicament reaction efficiency is improved.

Description

Technical Field

[0001] The invention belongs to the field of water treatment, and in particular relates to a system and method suitable for granulation crystallization water treatment. Background Art

[0002] Granulation crystallization water treatment technology is a water treatment technology that adds a certain proportion of seed particles to water and puts corresponding chemical agents in its fluidized state. During the flow process, the ions to be removed come into contact with the agent ions on the surface of the seed crystals, and the insoluble substances are continuously deposited on the surface of the seed crystals. The volume of the seed crystal particles continues to increase, and finally mature particles are discharged to remove the target pollutants. This technology is suitable for removing calcium, phosphorus, fluorine, heavy metal ions and other ions in water. It has the advantages of high mass transfer rate, no sludge generation, low water content of crystal particles, and easy solid-liquid separation.

[0003] However, the actual application of granulation crystallization technology has exposed some problems: the frequency of crystal seed discharge and addition from the equipment is high, and it is mainly done manually, which is difficult to operate and consumes a lot of labor; the particle size of discharged crystal seeds varies greatly, and a large number of growth period crystal seeds are seriously discharged and lost during the discharge; the fluidization state of the bed fluctuates greatly with the operating state and is difficult to control; the reagent consumption is too high, the reaction efficiency is lower than expected, the residual reagent is prone to post-reaction, and the effluent turbidity is high. Summary of the invention

[0004] The purpose of the system of the present invention is to solve the technical problem of short contact reaction time between water and seed crystals in the granulation crystallization reactor in the existing granulation crystallization technology, and to provide a system and method suitable for granulation crystallization water treatment.

[0005] To achieve the above object, the present invention adopts the following technical solution:

[0006] A system suitable for granulation crystallization water treatment, comprising a granulation crystallization reactor, a raw water tank and a new crystal seed dosing device; the raw water tank and the new crystal seed dosing device and the granulation crystallization reactor;

[0007] Among them, the granulation crystallization reactor is equipped with an upper water distributor and a water and medicine distribution device located below the upper water distributor. The water and medicine distribution device includes a lower water distribution plate, an upper water distribution plate, a water distribution cap and a medicine distribution cap; the lower water distribution plate is located at the bottom of the granulation crystallization reactor, the upper water distribution plate is located at the upper part of the lower water distribution plate, the water distribution cap passes through the upper water distribution plate and the lower water distribution plate, and the medicine distribution cap passes through the upper water distribution plate.

[0008] A further improvement of the present invention is that holes are provided at the centers of the lower water distribution plate and the upper water distribution plate, pipes are provided in the holes, and the pipes are connected to the seed discharge port of the granulation crystallization reactor.

[0009] A further improvement of the present invention is that the vertical section of the upper water distribution plate is in an inverted arc shape or a V shape.

[0010] A further improvement of the present invention is that raw water passes through the lower water distribution plate and the upper water distribution plate through the water distribution cap and enters the seed bed layer, the reagent enters the gap between the lower water distribution plate and the upper water distribution plate, and then enters the seed bed layer through the reagent distribution cap to mix with the raw water and crystallize.

[0011] A further improvement of the present invention is that the upper water distributor includes a central main pipe, which is connected to the central water outlet pipe at the top of the granulation crystallization reactor; the central main pipe is provided with a plurality of pipes arranged radially or in a herringbone shape and composed of wire winding tubes.

[0012] A further improvement of the present invention is that the granulation crystallization reactor is also connected to a mature seed crystal recovery and packaging device.

[0013] A further improvement of the present invention is that a granulation crystallization reactor outlet is provided with a granulation crystallization reactor outlet pipe, and the end of the granulation crystallization reactor outlet pipe is divided into two paths, one path is connected to the granulation crystallization reactor through the granulation crystallization reactor water production reflux pipe, and the other path is connected to the granulation crystallization reactor water production pipe.

[0014] A further improvement of the present invention is that a granulation crystallization reactor water production reflux stop valve is installed on the granulation crystallization reactor water production reflux pipe; a granulation crystallization reactor water production stop valve and a water production flow meter are installed on the granulation crystallization reactor water production pipe.

[0015] A further improvement of the present invention is that it also includes a dosing pipe for the reactor water inlet pipe, a dosing pipe inside the water distribution plate, and a dosing pipe on the upper part of the water distribution plate. The outlet of the dosing pipe of the reactor water inlet pipe is connected to the dosing port of the water inlet pipe of the granulation crystallization reactor, the outlet of the dosing pipe inside the water distribution plate is connected to the dosing port on the side wall of the granulation crystallization reactor water distribution plate, and the dosing pipe on the upper part of the water distribution plate is connected to the dosing port on the upper side wall of the water distribution plate of the granulation crystallization reactor.

[0016] A treatment method suitable for granulation crystallization water treatment technology, comprising the following steps:

[0017] The seed crystals are transported in liquid form to the granulation crystallization reactor, raw water is introduced into the granulation crystallization reactor from bottom to top, and the seed crystals are fluidized under the action of the water flow, and then the reaction reagents are added to the granulation crystallization reactor, and the crystal particles grow on the surface of the seed crystals to achieve the removal of substances in the raw water.

[0018] Furthermore, the new seed adding device includes a connected chain bucket loader and a liquid seed adding device, and the outlet of the liquid seed adding device is connected to the seed adding port of the granulation crystallization reactor 1 through a new seed adding pipeline, and is connected to the outlet of the seed recovery conveying screw in another way.

[0019] Furthermore, the mature seed recovery and packaging device includes a double-layer vibrating screen and a packaging machine. One outlet of the double-layer vibrating screen is connected to the inlet of the seed recovery conveying screw, and the other outlet is connected to the packaging machine.

[0020] Furthermore, the double-layer vibrating screen uses a stainless steel or wear-resistant material screen.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The present invention prevents homogeneous crystallization caused by pre-contact between the reagent and the raw water before reaching the seed bed by setting a double-layer water and drug distribution plate, thereby enhancing the crystallization efficiency and the seed growth rate. The present invention is suitable for the granulation crystal removal technology containing pollutants such as hardness, heavy metals, phosphorus, etc., can improve the operation stability of the granulation crystallization reactor, improve the reagent reaction efficiency, reduce the seed consumption, and reduce the difficulty of seed addition and recovery, and has good application prospects.

[0023] Furthermore, in view of the uneven growth of seed particles in granulation crystallization technology, the present invention provides a mature seed recovery and packaging device and a seed recovery conveying screw, and realizes the recycling of seed particles and reduces the consumption of seeds by classifying and screening fully grown saturated particles and unsaturated particles.

[0024] Furthermore, the present invention can achieve arbitrary ratio and high flow circulation of produced water and incoming water in the granulation crystallization reactor by setting a produced water reflux pipe in the granulation crystallization reactor, and maintain high flow rate in the granulation crystallization reactor by adjusting the ratio of incoming water and produced water, thereby ensuring the fluidization effect of the seed crystal. At the same time, the overall hydraulic retention time in the reactor can be enhanced by reflux of produced water, thereby enhancing the contact effect of the reagent.

[0025] Furthermore, the present invention arranges dosing pipes in the water inlet pipe of the granulation crystallization reactor, inside the water distribution plate, and on the water distribution plate, respectively. The dosing points can be set in the water inlet area, the water distribution area, and the fluidization area according to the dosing type and the reaction requirements, thereby improving the adaptability and flexibility of the equipment operation and improving the reaction efficiency of the agent.

[0026] Furthermore, in the present invention, a seed crystal discharge port is arranged at the center of the water distribution plate, and the vertical section of the water distribution plate is in an inverted arc shape or a V shape, and the height difference at the center of the water distribution plate is utilized to realize smooth discharge of the seed crystal particles at the bottom.

[0027] Furthermore, the large-particle seed crystals at the bottom of the reactor are discharged to the mature seed crystal recovery and packaging device. After screening by the seed crystal recovery device, the residual liquid, large particles and small particles are separated respectively. The mature large particles are discharged and automatically packaged and transported out through a packaging machine. The small particles are re-added to the seed crystal addition water tank through the seed crystal recovery conveying screw and continue to be added to the granulation crystallization reactor 1 for growth and utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural schematic diagram of a system applicable to granulation crystallization water treatment technology of the present invention;

[0029] Figure 2 It is a schematic diagram of installing the water distribution cap 22 and the medicine distribution cap.

[0030] In the figure, 1-granulation crystallization reactor, 2-raw water feed pump, 3-raw water tank, 4-granulation crystallization reactor outlet pipe, 5-granulation crystallization reactor water production reflux pipe, 6-granulation crystallization reactor water production pipe, 7-granulation crystallization reactor water production reflux stop valve, 8-granulation crystallization reactor water production stop valve, 9-water production flow meter, 10-water inlet flow meter, 11-reactor water inlet pipe dosing pipe, 12-water distribution plate internal dosing pipe, 13-water distribution plate upper dosing pipe , 14-air blowing pipeline, 15-new seed dosing device, 16-new seed dosing pipeline, 17-mature seed recovery and packaging device, 18-seed discharge pipeline, 19-seed recovery and conveying screw, 20-upper water distribution plate, 21-holes, 22-water distribution cap, 1.1-water and medicine distribution device, 1.2-upper water distributor, 15.1-chain bucket feeder, 15.2-seed liquid dosing device, 17.1-double-layer vibrating screen, 17.2-packaging machine. DETAILED DESCRIPTION

[0031] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly and comprehensively understood.

[0032] In addition, when an element in the present invention is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only embodiment.

[0033] In order to solve the technical problems of frequent manual operation of seed addition and recovery in the granulation crystallization reactor, unstable fluidized state, serious loss during the discharge of immature growth period seed, short contact reaction time with seed and insufficient reaction, a system suitable for granulation crystallization water treatment is provided. The present invention is suitable for removing calcium, phosphorus, fluorine, heavy metal ions and the like in water by granulation crystallization method, and improves the efficiency of reagent reaction by maintaining the seed suspension concentration in the granulation crystallization reactor to ensure the effluent water quality, and improves the anti-fluctuation ability of the system under the condition of fluctuating incoming water volume and frequent start-stop operation; at the same time, by matching the seed addition and recovery equipment and optimizing the internal design of the reactor, the seed loss can be reduced, and the difficulty of seed addition and recovery operation can be reduced, and the application prospect is good.

[0034] refer to Figure 1 The system suitable for granulation crystallization water treatment technology of the present invention mainly includes a granulation crystallization reactor 1, a raw water supply pump 2, a raw water pool 3, a granulation crystallization reactor outlet pipe 4, a granulation crystallization reactor water production reflux pipe 5, a granulation crystallization reactor water production pipe 6, a granulation crystallization reactor water production reflux stop valve 7, a granulation crystallization reactor water production stop valve 8, a water production flow meter 9, a water inlet flow meter 10, a reactor water inlet pipe dosing pipe 11, a water distribution plate internal dosing pipe 12, a water distribution plate upper dosing pipe 13, an air blowing pipe 14, a new crystal seed dosing device 15, a new crystal seed dosing pipe 16, a mature crystal seed recovery and packaging device 17, a crystal seed discharge pipe 18 and a crystal seed recovery and conveying screw 19.

[0035] Among them, the granulation crystallization reactor 1 is equipped with an upper water distributor 1.2, which includes a central main pipe, on which are arranged a number of pipes composed of wire winding tubes in a radial or fishbone shape. The central main pipe is connected to the central water outlet pipe at the top of the granulation crystallization reactor 1.

[0036] The granulation crystallization reactor 1 is equipped with a water distribution cap 22, a medicine distribution cap and a water and medicine distribution device 1.1 located below the upper water distributor 1.2. The water and medicine distribution device 1.1 is a double-layer design, including a lower water distribution plate, an upper water distribution plate 20, a water distribution cap 22 and a medicine distribution cap 4 parts; the lower water distribution plate is located at the upper part of the lower head (the lower head is the bottom end of the granulation crystallization reactor 1) and is sealed and connected to the inner wall of the granulation crystallization reactor 1, and the upper water distribution plate 20 is located at the upper part of the lower water distribution plate, and the upper water distribution plate 20 is sealed and connected to the inner wall of the granulation crystallization reactor 1.

[0037] See also Figure 2 The lower water distribution plate and the upper water distribution plate 20 of the water and medicine distribution device 1.1 have openings 21 in the center, and a through-tube is arranged through the opening 21, and the through-tube is connected to the seed discharge port of the granulation crystallization reactor 1. The vertical section of the upper water distribution plate 20 is an inverted arc or V-shaped, and the height difference between the lowest point and the highest point is not less than 40mm.

[0038] The water distribution cap 22 is installed through both the upper water distribution plate 20 and the lower water distribution plate, and the medicine distribution cap is installed only through the upper water distribution plate 20. The raw water passes through the lower water distribution plate and the upper water distribution plate 20 through the water distribution cap 22 and enters the seed bed layer, and the medicine enters the gap between the lower water distribution plate and the upper water distribution plate 20 through the internal medicine dosing pipe 12 of the water distribution plate connected to the side wall between the lower water distribution plate and the upper water distribution plate 20, and then enters the seed bed layer through the medicine distribution cap to mix with the raw water for crystallization.

[0039] The raw water tank 3, the raw water feed pump 2 and the granulation crystallization reactor 1 are connected in sequence through pipelines; the granulation crystallization reactor outlet pipe 4 is connected to the outlet of the granulation crystallization reactor 1; the end of the granulation crystallization reactor outlet pipe 4 is divided into two paths, one is connected to the starting end of the granulation crystallization reactor water production return pipe 5, and the other is connected to the starting end of the granulation crystallization reactor water production pipe 6; the end of the granulation crystallization reactor water production return pipe 5 is connected to the inlet pipe of the raw water feed pump 2; the end of the granulation crystallization reactor water production pipe 6 is connected to the granulation crystallization back-end process equipment; the granulation crystallization reactor water production reflux stop valve 7 is installed on the granulation crystallization reactor water production reflux pipe 5; the granulation crystallization reactor water production stop valve 8 and the water production flowmeter 9 are installed on the granulation crystallization reactor water production pipe 6; The water inlet flowmeter 10 is installed on the water inlet pipe section of the granulation crystallization reactor 1; the outlet of the reactor water inlet pipe dosing pipe 11 is connected to the dosing port of the granulation crystallization reactor 1 water inlet pipe, the outlet of the dosing pipe 12 inside the water distribution plate is connected to the dosing port on the side wall of the granulation crystallization reactor 1 at the water distribution plate, and the dosing pipe 13 on the upper part of the water distribution plate is connected to the dosing port on the upper side wall of the water distribution plate of the granulation crystallization reactor 1; the two sides of the air blowing pipe 14 are respectively connected to the corresponding fan outlet and the air inlet of the granulation crystallization reactor 1; the new seed dosing device 15, the new seed dosing pipe 16, and the seed dosing port of the granulation crystallization reactor 1 are connected in sequence through pipes; the mature seed recovery and packaging device 17, the seed discharge pipe 18, and the seed discharge port of the granulation crystallization reactor 1 are connected in sequence through pipes.

[0040] Furthermore, the new seed adding device 15 includes a connected chain bucket loader 15.1 and a liquid seed adding device 15.2. The outlet of the liquid seed adding device 15.2 is connected to the seed adding port of the granulation crystallization reactor 1 through the new seed adding pipeline 16, and is connected to the outlet of the seed recovery and conveying screw 19 in another way.

[0041] Furthermore, the mature seed recovery and packaging device 17 comprises a double-layer vibrating screen 17.1 and a packaging machine 17.2. One outlet of the double-layer vibrating screen 17.1 is connected to the inlet of the seed recovery conveying screw 19, and the other outlet is connected to the packaging machine 17.2.

[0042] Furthermore, the double-layer vibrating screen 17.1 uses a stainless steel or other wear-resistant material screen, and the apertures of the upper and lower screens are preferably selected according to the particle size distribution of the new seed crystals and the mature seed crystal particles;

[0043] Furthermore, a drainage channel should be provided at the bottom of the double-layer vibrating screen 17.1 to collect and discharge the residual liquid after the seed crystals are screened;

[0044] Furthermore, the seed particles used for granulation and crystallization can be selected from quartz sand, garnet, calcite, etc. according to the material to be removed.

[0045] Furthermore, one or more or none of the dosing pipes 11 for the reactor water inlet pipe, the dosing pipes 12 inside the water distribution plate, and the dosing pipes 13 on the upper part of the water distribution plate may be respectively provided according to the process operation requirements.

[0046] A treatment method suitable for granulation crystallization water treatment technology of the present invention comprises the following steps:

[0047] 1) Seed addition: Before the initial operation of the equipment and after the seed discharge, new seed needs to be added. The original seed is transported to the seed liquid addition device 15.2 by using the chain bucket feeder 15.1, and the seed is transported to the granulation crystallization reactor 1 in liquid form by using the fluidization characteristics of the seed.

[0048] 2) Operation: The raw water is lifted by the raw water feed pump 2 and enters the granulation crystallization reactor 1 from bottom to top. Then, the granulation crystallization reactor water production reflux stop valve 7 and the granulation crystallization reactor water production stop valve 8 are adjusted according to the required water treatment volume, and the water production flow meter 9 and the water inlet flow meter 10 are observed until the fluidization state of the seed crystal is adjusted to be good. The filled seed crystal reaches the fluidization state under the action of the water flow, and then the reaction reagent is added to the granulation crystallization reactor 1, and the crystal particles grow on the surface of the seed crystal to achieve the removal of substances in the raw water.

[0049] 3) Seed discharge: Use the seed discharge pipe 18 to discharge the large-particle seeds at the bottom of the reactor to the mature seed recovery and packaging device 17. After the screening action of the seed recovery device 17, the residual liquid, large particles and small particles are separated respectively. After the mature large particles are discharged, they are automatically packaged and transported out through the packaging machine 17.2. The small particles are re-added to the seed addition water tank through the seed recovery conveying screw 19 and continue to be added to the granulation crystallization reactor 1 for growth and utilization.

[0050] The specific embodiments are as follows:

[0051] The water from a factory is high-salinity mine drainage water. It is treated by a system suitable for granulation crystallization water treatment technology. The maximum treatment capacity of the device is 200m 3 / h, rising velocity 90-150m / s, inlet water quality indicators are shown in Table 1 below:

[0052] Table 1 Influent water quality indicators

[0053]

[0054] 1) Seed addition: Before the system is first used, use the new seed addition device to add new seeds to the granulation crystallization reactor; use the chain bucket feeder to add the new seeds to the seed liquid addition device, and add them in liquid form through the seed liquid addition device. The seed bed static filling height is 900mm;

[0055] 2) Operation: Sodium hydroxide and sodium carbonate are used as treatment agents for the granulation crystallization reactor. To prevent the granulation crystallization reactor from being blocked by instantaneous crystallization caused by premature addition of the agent, the dosing interface on the upper part of the water distribution plate is used as the dosing point for sodium hydroxide and sodium carbonate; the dosing amounts of sodium hydroxide and sodium carbonate are 550mg / L and 50mg / L respectively;

[0056] 3) Seed discharge: During continuous operation, observe the fluidization and growth of the seed in the granulation crystallization reactor through the sampling port and the sight glass. When the continuous operation is 140h and the average operating flow rate is 170m 3 / h, the static height of the seed bed increases to 622mm, and the seed particle size can reach 2mm. Then open the seed discharge door to discharge some seeds to reduce the seed height. Use the seed recovery device to separate the residual liquid, large particles, and small particles. After the mature large particles are discharged, they are automatically packaged and transported by the packaging machine. The small particles are re-added to the seed feeding water tank through the seed recovery conveying screw for standby use. After each seed discharge, the static height of the seed is reduced to about 1100mm;

[0057] 4) Seed supplement: The seed supplement method is the same as the seed addition method. After supplementation, the seed bed is statically filled to a height of 1300 mm;

[0058] 5) During continuous operation, the system water output is stable, and the water quality indicators are shown in the following table:

[0059] Table 2 Outlet water quality indicators

[0060]

[0061] The present invention can realize arbitrary proportion and large flow circulation of the produced water of the granulation crystallization reactor and the incoming water inside the granulation crystallization reactor by setting the produced water return pipe of the granulation crystallization reactor, and maintain the high flow rate inside the granulation crystallization reactor by adjusting the proportion of the incoming water and the produced water, so as to ensure the fluidization effect of the crystal seed. At the same time, the adaptability and flexibility of the equipment operation are improved by adjusting the dosing position, the contact efficiency of the agent is improved, and the removal effect of the pollutants is strengthened. In addition, the present invention is aimed at the uneven growth of the crystal seed particles of the granulation crystallization technology, and a mature crystal seed recovery and packaging device and a crystal seed recovery and conveying screw are set. By classifying and screening the saturated particles and unsaturated particles with full growth, the recycling of the crystal seed particles is realized, and the consumption of the crystal seed is reduced. The present invention is suitable for the granulation crystal removal technology containing pollutants such as hardness, heavy metals, phosphorus, etc., which can improve the operation stability of the granulation crystallization reactor, improve the reaction efficiency of the agent, reduce the consumption of the crystal seed, and reduce the difficulty of the operation of adding and recovering the crystal seed, and has good application prospects.

[0062] The above description is only for the best embodiment of the present invention, but it should not be understood as limiting the claims. The present invention is not limited to the above embodiments, and its specific structure is allowed to be changed. However, all changes made within the protection scope of the independent claims of the present invention are within the protection scope of the present invention.

[0063] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

Claims

1. A system suitable for granulation crystallization water treatment, characterized in that: It comprises a granulation crystallization reactor (1), a raw water tank (3) and a new crystal seed dosing device (15); the raw water tank (3) and the new crystal seed dosing device (15) and the granulation crystallization reactor (1); The granulation crystallization reactor (1) is equipped with an upper water distributor (1.2) and a water and medicine distributing device (1.1) located below the upper water distributor (1.2). The water and medicine distributing device (1.1) comprises a lower water distribution plate, an upper water distribution plate (20), a water distribution cap (22) and a medicine distributing cap; the lower water distribution plate is located at the bottom of the granulation crystallization reactor (1), the upper water distribution plate (20) is located above the lower water distribution plate, the water distribution cap (22) passes through the upper water distribution plate (20) and the lower water distribution plate, and the medicine distributing cap passes through the upper water distribution plate (20).

2. The system suitable for granulation crystallization water treatment according to claim 1, characterized in that: A hole is provided at the center of the lower water distribution plate and the upper water distribution plate (20), and a pipeline is provided in the hole, and the pipeline is connected to the seed crystal discharge port of the granulation crystallization reactor (1).

3. The system suitable for granulation crystallization water treatment according to claim 1, characterized in that: The vertical cross section of the upper water distribution plate (20) is in an inverted arc shape or a V shape.

4. The system suitable for granulation crystallization water treatment according to claim 1, characterized in that: The raw water passes through the lower water distribution plate and the upper water distribution plate (20) through the water distribution cap (22) and enters the seed crystal bed layer, and the reagent enters the gap between the lower water distribution plate and the upper water distribution plate (20), and then enters the seed crystal bed layer through the reagent distribution cap to mix with the raw water and crystallize.

5. The system suitable for granulation crystallization water treatment according to claim 1, characterized in that: The upper water distributor (1.2) comprises a central main pipe, which is connected to the central water outlet pipe at the top of the granulation crystallization reactor (1); the central main pipe is provided with a plurality of pipes arranged in a radial or herringbone shape and composed of wire-wound pipes.

6. The system suitable for granulation crystallization water treatment according to claim 1, characterized in that: The granulation and crystallization reactor (1) is also connected to a mature seed crystal recovery and packaging device (17).

7. The system suitable for granulation crystallization water treatment according to claim 1, characterized in that: The granulation crystallization reactor (1) is provided with a granulation crystallization reactor outlet pipe (4), and the end of the granulation crystallization reactor outlet pipe (4) is divided into two paths, one of which is connected to the granulation crystallization reactor (1) through the granulation crystallization reactor water production return pipe (5), and the other of which is connected to the granulation crystallization reactor water production pipe (6).

8. The system suitable for granulation crystallization water treatment according to claim 7, characterized in that: A granulation crystallization reactor water production reflux stop valve (7) is installed on the granulation crystallization reactor water production reflux pipe (5); a granulation crystallization reactor water production stop valve (8) and a water production flow meter (9) are installed on the granulation crystallization reactor water production pipe (6).

9. The system suitable for granulation crystallization water treatment according to claim 1, characterized in that: It also includes a reactor water inlet pipe dosing pipe (11), a water distribution plate internal dosing pipe (12), and a water distribution plate upper dosing pipe (13), wherein the reactor water inlet pipe dosing pipe (11) outlet is connected to the granulation crystallization reactor (1) water inlet pipe dosing port, the water distribution plate internal dosing pipe (12) outlet is connected to the granulation crystallization reactor (1) side wall dosing port at the water distribution plate, and the water distribution plate upper dosing pipe (13) is connected to the granulation crystallization reactor (1) side wall dosing port at the water distribution plate.

10. A treatment method suitable for granulation crystallization water treatment technology based on the system according to any one of claims 1 to 9, characterized in that: The following steps are involved: The seed crystals are transported in liquid form to a granulation crystallization reactor (1). Raw water is introduced into the granulation crystallization reactor (1) from bottom to top, and the seed crystals are fluidized under the action of the water flow. Then, a reaction agent is added to the granulation crystallization reactor (1), and crystal particles grow on the surface of the seed crystals, thereby achieving the removal of substances in the raw water.

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