A nucleogranulation device and its operation method

Abstract

This invention discloses a nucleogranulation device and its operating method, comprising an annular water distribution pipe installed below a tank, a sludge pipe installed on the tank at the bottom of the annular water distribution pipe, and a granulation reaction zone, a concentration zone, a separation zone, an inclined plate clarification zone, and an overflow trough arranged sequentially from bottom to top above the annular water distribution pipe. A packing device is installed in the separation zone; a drain outlet is provided on the overflow trough; a hollow barrel is located at the center of the granulation reaction zone, and an axial flow pump is installed inside the hollow barrel. The axial flow pump is used to pump part of the water in the concentration zone into the central hollow barrel and transport it to the center of the annular water distribution pipe, with the hollow barrel located directly above the annular water distribution pipe. A water flow disperser is installed at the bottom of the annular water distribution pipe. This invention can increase the operating load, increase the treatment depth, effectively improve the operating load and sludge concentration effect, and the discharged sludge can be directly dewatered, thus improving the effluent quality.

Description

Technical Field

[0001] This invention relates to the field of industrial wastewater treatment technology, and in particular to a nucleation granulation device and its operation method. Background Technology

[0002] Traditional sedimentation tanks have limited capacity to remove pollutants such as chemical oxygen demand (COD) and activated sludge concentration (SS) from wastewater, and only have a single sedimentation and clarification function. Therefore, a flocculation reaction tank needs to be built in front of the sedimentation tank, which increases the footprint and construction cost of the water treatment system.

[0003] Ordinary sedimentation tanks achieve solid-liquid separation by using gravity sedimentation, which utilizes the difference in specific gravity of suspended solids to cause them to settle to the bottom of the tank.

[0004] Ordinary sedimentation tanks are suitable for treating general suspended solids, such as silt and turbidity.

[0005] However, the drawbacks of ordinary devices are:

[0006] 1. Large footprint. Because ordinary sedimentation tanks are arranged horizontally, the sedimentation distance is long, thus requiring a large land area.

[0007] 2. Low treatment efficiency. Due to the excessively fast water flow rate in the sedimentation tank, suspended solids do not settle completely, resulting in low treatment efficiency.

[0008] 3. Prone to clogging. Incomplete settling of suspended solids in the sedimentation tank easily clogs pipes and equipment. Poor sludge thickening effect. Summary of the Invention

[0009] In order to overcome the defects of the existing technology, the present invention aims to provide a nucleation granulation device and operation method. The device can increase the operating load and the treatment depth, effectively improve the operating load and sludge thickening effect, and the discharged sludge can be directly dewatered, thus improving the quality of the effluent.

[0010] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0011] A nuclear crystal granulation device includes an annular water distribution pipe installed below a tank body, the annular water distribution pipe mixing incoming water and chemical feed, a sludge discharge device installed on the tank body at the bottom of the annular water distribution pipe, and a granulation reaction zone, a concentration zone, a separation zone, a clarification zone and an outlet water zone distributed sequentially from bottom to top above the annular water distribution pipe.

[0012] A packing device is provided in the separation zone;

[0013] A hollow barrel without a top or bottom is set at the center of the granulation reaction zone. An axial flow pump is installed inside the hollow barrel. The axial flow pump is used to pump part of the water in the concentration zone into the central hollow barrel and transport it to the center of the annular water distribution pipe. The hollow barrel is located directly above the annular water distribution pipe.

[0014] A water flow disperser is installed at the bottom of the annular water distribution pipe. The water flow disperser is used to evenly disperse the water flow in the water distribution pipe, so that the water flow is in a turbulent state, and the substances inside the liquid are mixed evenly.

[0015] The annular water distribution pipe allows the medicine to fully react with impurities in the wastewater. The annular water distribution pipe is divided into three sections from bottom to top: annular water distribution pipe one, annular water distribution pipe two, and annular water distribution pipe three. Any two annular water distribution pipes are used for medicine feeding, and the other annular water distribution pipe is used for water feeding. Several small holes are opened on the inner side of the surface of the annular water distribution pipe. The diameter of the annular water distribution pipe is larger than that of the central hollow barrel.

[0016] The annular water distribution pipe has several small holes facing upwards on its surface, with the holes on the first annular water distribution pipe facing downwards and the holes on the third annular water distribution pipe facing horizontally. The substances sprayed from the three annular water distribution pipes mix at the center of the second annular water distribution pipe.

[0017] The granulation reaction zone is the area formed by the water flowing back from the concentration zone through the hollow barrel and the outer wall of the tank. The concentration zone is used to concentrate the sludge after the granulation reaction zone, and the separation zone is used to separate the concentrated sludge from the water.

[0018] The hollow barrel is fixed by steel bars, which are set on the inner wall of the tank.

[0019] The sewage discharge device is a sludge pipe.

[0020] The clarification zone includes inclined plates arranged at equal intervals in sequence, forming an inclined plate clarification zone.

[0021] The water outlet area includes an overflow trough located above the clarification zone, and the overflow trough is provided with a drain outlet located on the side wall of the tank.

[0022] The concentration zone includes a concentration tank, which is a conical concentration tank.

[0023] The water flow disperser includes a bottom bearing and an umbrella-shaped structure located at the upper end of the bearing. The umbrella-shaped structure can be rotated by a motor at its bottom. Several triangular pointed protrusions are arranged on the surface of the umbrella-shaped structure, and the triangular pointed protrusions are arranged around the surface of the umbrella-shaped structure.

[0024] The water flow disperser consists of two units per square centimeter, each 0.5 cm high.

[0025] The umbrella-shaped structure forms an angle of 20-65 degrees with the horizontal plane, and the triangular pointed structure protrudes obliquely towards the vertical bearing position, with the triangular pointed structure protruding at an angle of 45-60 degrees to the vertical bearing.

[0026] The packing device includes a packing frame, which is composed of individual laminar flow units. The individual laminar flow units are arranged in left-right layers, with several individual laminar flow units arranged in each layer.

[0027] The individual laminar flow unit is a square / rectangular tube, specifically a square tube with dimensions of 40*40cm, 80*80cm, and a rectangular range of 40-80cm, with a combination of length and width.

[0028] The square / rectangular tube is inclined at an angle of 75° to 55°.

[0029] The square / rectangular tubes are set at an angle, with one layer tilted to the left and the other to the right, with intervals between them;

[0030] The inclined square / rectangular tube has inward and outward inclined square / rectangular tubes on both sides;

[0031] The inclination angle of the square / rectangular tube is 75° to 55°.

[0032] A method for operating a nuclear crystal granulation device: water enters through annular water distribution pipe 1 and annular water distribution pipe 3, and the mixed reagent enters through annular water distribution pipe 2. The diameter of the annular water distribution pipe is larger than that of the central hollow barrel. The water flow from the concentration zone flows upward through the area formed by the hollow barrel and the outer wall of the overall device, i.e., the granulation reaction zone. After reaching the concentration zone, some water is pumped by an axial flow pump to the interior of the central hollow barrel until the center of the annular water distribution pipe 1, annular water distribution pipe 2, and annular water distribution pipe 3. The water flow is evenly dispersed by the water flow disperser, so that the water flow is in a turbulent state, so that the substances inside the liquid are evenly mixed. After passing through the granulation reaction zone, it flows through the concentration zone (9) for sludge concentration. Then, the sludge is separated from the water by the packing device in the separation zone. The sludge reaches the inclined plate clarification zone to settle smaller particles of sludge. Finally, the clear water flows out through the overflow tank and is discharged from the device through the drain outlet. The sludge settled in the device is discharged by the sludge pipe.

[0033] The function of the first, second, and third annular water distribution pipes is to distribute water evenly so that the reagents can fully react with the impurities in the wastewater.

[0034] After the raw water enters from the bottom of the device, the pre-added seed crystals are suspended in a fluidized state in the tank through the second annular water distribution pipe. Then, the water and the added alkaline chemical reagents are fully mixed in the granulation reaction zone, concentration zone and the interior of the hollow tank, so that the ions in the water adhere to the surface of the seed crystals in a heterogeneous crystallization manner to form ion crystals.

[0035] As the water flows upward, the ionic crystals act as the crystal nuclei. Ions in the water continuously gather outside the crystal nuclei and form dense granules. The density of the granules increases from low to high. Granules with lower density re-enter the central hollow barrel with the water flow in the separation zone and are fully mixed in the granulation reaction zone until they form granules with higher density. Granules deposited at the bottom are periodically removed. The above reaction process is repeated, and most of the ions in the water form granules with the crystal nuclei, achieving efficient removal of hardness and impurities from the water.

[0036] The beneficial effects of this invention are:

[0037] 1. This device has a reasonable structure, and its overall structure and size can directly replace the corresponding device in the original sewage treatment plant and be put into use directly. It occupies a small area, has low cost, and is easy to operate.

[0038] 2. The process flow of this device is simple: the water inlet and the chemical inlet are carried out simultaneously, without the need for other auxiliary coagulation and sedimentation processes, making the overall process flow simpler.

[0039] 3. This invention effectively improves operating load and sludge thickening effect, significantly increasing sludge thickening efficiency, and allowing for direct dewatering of discharged sludge. This improves the quality of the effluent.

[0040] 4. The packing device effectively improves the operating load and sludge thickening effect, significantly increasing the sludge thickening efficiency. Sludge discharge can be directly dewatered, thus improving the effluent quality. Its reasonable structure and overall size allow it to directly replace the original inclined plate and be put into use.

[0041] 5. The purpose of using square tubes in the packing device is to form individual laminar flow units and increase the flow area of ​​the inclined plates, thereby improving the efficiency of suspended solids removal. The packing is arranged in left-right layers to ensure uniform and stable water flow from the top within a small area. Attached Figure Description

[0042] Figure 1 This is a schematic diagram of the structure of the present invention.

[0043] Figure 2 This is a side view of the present invention.

[0044] Figure 3 This is a front view of the packing device of the present invention.

[0045] Figure 4 This is a side view of the packing device of the present invention.

[0046] Figure 5 This is a top view of the packing device of the present invention.

[0047] Figure 6 This is a schematic diagram of the water flow disperser of the present invention.

[0048] Figure 7 This is a top view of the water flow disperser of the present invention.

[0049] Explanation of icon numbers:

[0050] 1. Annular water distribution pipe one, 2. Annular water distribution pipe two, 3. Annular water distribution pipe three, 4. Sludge pipe, 5. Granulation reaction zone, 6. Axial flow pump, 7. Hollow barrel, 8. Reinforcing steel, 9. Concentration zone, 10. Separation zone, 11. Inclined plate clarification zone, 12. Overflow trough, 13. Drain outlet, 14. Packing device, 15. Water flow disperser. Detailed Implementation

[0051] The present invention will now be described in further detail with reference to the accompanying drawings.

[0052] like Figure 1 , Figure 2 As shown: A nuclear crystal granulation device includes an annular water distribution pipe installed below the tank body. A sludge pipe 4 is installed on the tank body at the bottom of the annular water distribution pipe. A granulation reaction zone 5, a concentration zone 9, a separation zone 10, an inclined plate clarification zone 11, and an overflow trough 12 are distributed sequentially from bottom to top above the annular water distribution pipe. A drain outlet 13 is provided on the overflow trough 12.

[0053] A hollow barrel 7 is located at the center of the granulation reaction zone 5. An axial flow pump 6 is installed inside the hollow barrel 7. The axial flow pump 6 is used to pump part of the water in the concentration zone 9 into the central hollow barrel 7 and transport it to the center of the annular water distribution pipe. The hollow barrel 7 is located directly above the annular water distribution pipe.

[0054] The annular water distribution pipe allows the reagent to fully react with impurities in the wastewater. The annular water distribution pipe is divided into three sections from bottom to top: annular water distribution pipe 1, annular water distribution pipe 2, and annular water distribution pipe 3. The diameter of the annular water distribution pipe is larger than that of the central hollow barrel 7.

[0055] The granulation reaction zone 5 is the area formed by the water flowing back from the concentration zone 9 through the hollow barrel 7 and the outer wall of the tank. The concentration zone 9 is used to concentrate the sludge after the granulation reaction zone 5, and the separation zone 10 is used to separate the concentrated sludge from the water.

[0056] The hollow barrel 7 is fixed by steel bars 8, which are set on the inner wall of the tank.

[0057] The diameter of the circle formed by the annular water distribution pipes is larger than that of the central hollow barrel 7. Water and gas are released from the annular water distribution pipes 1, 2, and 3. The gas disturbs the water, creating turbulent flow that carries the water to the granulation reaction zone 5 where it mixes. In the concentration zone 9, sludge undergoes free settling under its own gravity inside the concentration tank. The sludge settled at the bottom of the concentration tank is squeezed between the upper and lower parts, further dewatering it, ultimately resulting in a high-concentration sludge layer at the bottom of the conical concentration tank. Small sludge particles separated by the packing device 14 in the separation zone 10 settle. In the inclined plate clarification zone 11, after the wastewater passes through, the inclined plates allow the water to flow slowly. Suspended solids and particulate matter begin to settle due to gravity, while the water flow is blocked by the inclined plates, causing the sludge to slide down the surface of the plates. The inclined plates expand the sedimentation area of ​​the clarification zone, improving the clarification effect and saving space.

[0058] This device works by adding chemical agents to form larger particles, which agglomerate suspended matter on the surface of the particles, and then settle them by gravity sedimentation.

[0059] Compared to ordinary sedimentation tanks, this device offers superior performance in treating suspended solids. It can generate larger particles, increasing the settling velocity and efficiency of suspended solids, thus achieving better solid-liquid separation. Through flow regulation, pre-added seed crystals are fluidized to form a seed crystal suspension layer. Added chemical agents improve the coagulation of pollutants, inducing pollutants and crystals to form copolymers through a one-to-one attachment and aggregation pattern, completing floc granulation and densification, thereby achieving highly efficient solid-liquid separation of pollutants.

[0060] This device is more suitable for handling fine, difficult-to-settle suspended matter, such as colloidal particles and organic matter.

[0061] like Figures 3-5 As shown, the packing device 14 includes a packing frame, which is composed of individual laminar flow units. The individual laminar flow units are arranged in left-right layers, with several individual laminar flow units arranged in each layer.

[0062] The individual laminar flow unit is a square / rectangular tube, specifically a square tube, to form an individual laminar flow unit and increase the flow area of ​​the inclined plate, thereby improving the efficiency of removing suspended solids.

[0063] The individual laminar flow units are arranged in left-right layers. The purpose of this is to ensure that the water output from above is uniform and stable within a small area.

[0064] The square / rectangular tubes are inclined, and since the optimal tilt angle for inclined plate sedimentation is 75° to 55°, the tilt angle is set to 75° to 55° here to improve sedimentation efficiency.

[0065] The individual laminar flow unit is a square / rectangular tube, most commonly a square tube, with specifications of 40*40cm, 80*80cm, and generally rectangular in the range of 40-80cm, with combinations of length and width.

[0066] The purpose of laying the layers on the left and right is to ensure uniform effluent flow over a wide area and to accommodate the maximum amount of packing material, thereby increasing sedimentation efficiency.

[0067] This packing device is located in the upper part of the core granulation unit, 0.4m to 0.6m from the top. It ensures complete sedimentation in a uniform flow state before outflow.

[0068] The square tube packing material is made of PVC, fiberglass, and PPR, and the material can be adjusted according to different water qualities.

[0069] like Figure 6 , Figure 7 As shown, the water flow disperser 15 includes a bottom bearing and an umbrella-shaped structure located at the upper end of the bearing. The umbrella-shaped structure can be rotated by a motor at its bottom. Several triangular pointed protrusions are arranged on the surface of the umbrella-shaped structure, and the triangular pointed protrusions are arranged around the surface of the umbrella-shaped structure. The triangular pointed protrusions can evenly disperse the water flow, making the water flow into a turbulent state, so that the substances inside the liquid are mixed evenly, thereby achieving more efficient solid-liquid separation of pollutants.

[0070] The water flow disperser 15 has two units per square centimeter, each 0.5 cm high. The water flow disperser 15 evenly disperses the water flow, creating a turbulent flow that ensures uniform mixing of substances within the liquid, thereby achieving more efficient solid-liquid separation of pollutants.

[0071] The umbrella-shaped structure forms an angle of 20-65 degrees with the horizontal plane, and the triangular pointed structure protrudes obliquely towards the vertical bearing position, with an angle of 45-60 degrees between the triangular pointed structure protrusion and the vertical bearing. The triangular pointed structure protrusion can evenly disperse the water flow, making the water flow into a turbulent state, so as to make the substances inside the liquid mix evenly, thereby achieving more efficient solid-liquid separation of pollutants.

[0072] Working principle of the invention:

[0073] Water enters through annular water distribution pipe 1 and annular water distribution pipe 3. The mixed reagent enters through annular water distribution pipe 2. The diameter of the annular water distribution pipe is larger than that of the central hollow barrel 7. The water flowing back from the concentration zone 9 flows upward through the area formed by the hollow barrel 7 and the outer wall of the overall device, i.e., the granulation reaction zone 5. After reaching the concentration zone 9, some of the water is pumped by the axial flow pump 6 into the central hollow barrel 7 until it reaches the center of the annular water distribution pipes 1, 2, and 3. The water is evenly dispersed by the water flow disperser 15, making the water flow turbulent and ensuring that the substances inside the liquid are evenly mixed. After passing through the granulation reaction zone 5, it flows through the concentration zone 9 for sludge concentration. Then, the sludge is separated from the water by the packing device 14 in the separation zone 10. It reaches the inclined plate clarification zone 11 to settle smaller sludge particles. Finally, the clear water flows out through the overflow tank 12 and is discharged from the device through the drain outlet 13. The sludge settled in the device is discharged through the sludge pipe 4. (The hollow barrel 7 is fixed by steel bar 8 and is fixed at the center of the device).

[0074] The functions of the annular water distribution pipes 1, 2, and 3 are to distribute water evenly, allowing the reagent to fully react with impurities in the wastewater. The hollow barrel 7 separates two regions with different flow rates for the nucleation and granulation process, and also allows the water to form a circulation within the device.

[0075] After the raw water enters from the bottom of the device, it is suspended in a fluidized state in the tank through the annular water distribution pipe 2, causing the pre-added seed crystals to remain suspended. Subsequently, the incoming water and the added alkaline chemical reagents are thoroughly mixed in the granulation reaction zone 5, the concentration zone 9, and the interior of the hollow tank 7. This causes ions in the water to adhere to the surface of the seed crystals in a heterogeneous crystallization manner, forming ion crystals. As the water flows upward, the ion crystals act as crystal nuclei, and ions in the water continuously accumulate outside the nuclei, forming denser granules. The density of the granules increases from low to high. Granules with lower density re-enter the central hollow tank 7 in the separation zone 10 with the water flow and are thoroughly mixed in the granulation reaction zone 5 until they form denser granules. Granules deposited at the bottom are periodically removed. This reaction process is repeated, with the vast majority of ions in the water forming granules with the crystal nuclei, achieving efficient removal of hardness and impurities from the water.

Claims

1. A nucleus crystal granulation device, characterized in that, Includes an annular water distribution pipe installed below the tank body, which mixes the incoming water and the incoming medicine. A sewage discharge device is installed on the tank body at the bottom of the annular water distribution pipe. The annular water distribution pipe is arranged in sequence from bottom to top as a granulation reaction zone (5), a concentration zone (9), a separation zone (10), a clarification zone, and an outlet water zone. A packing device (14) is provided at the separation zone (10); A hollow barrel (7) without a top or bottom is set at the center of the granulation reaction zone (5). An axial flow pump (6) is installed inside the hollow barrel (7). The axial flow pump (6) is used to pump part of the water in the concentration zone (9) into the central hollow barrel (7) and transport it to the center of the annular water distribution pipe. The hollow barrel (7) is located directly above the annular water distribution pipe. A water flow disperser (15) is installed at the bottom of the annular water distribution pipe. The water flow disperser (15) is used to evenly disperse the water flow generated by the annular water distribution pipe, so that the water flow is in a turbulent state and the substances inside the liquid are mixed evenly. The annular water distribution pipe allows the agent to fully react with impurities in the sewage. The annular water distribution pipe is divided into annular water distribution pipe one (1), annular water distribution pipe two (2), and annular water distribution pipe three (3) from bottom to top. Any two annular water distribution pipes are used for drug delivery, and the other annular water distribution pipe is used for water delivery. Several small holes are opened on the inner side of the surface of the annular water distribution pipe. The diameter of the annular water distribution pipe is larger than that of the central hollow barrel (7). The granulation reaction zone (5) is the area formed by the water flowing back from the concentration zone (9) through the hollow barrel (7) and the outer wall of the tank. The concentration zone (9) is used to concentrate the sludge after the granulation reaction zone (5), and the separation zone (10) is used to separate the concentrated sludge from the water. The hollow barrel (7) is fixed by steel bars (8), which are set on the inner wall of the tank. The clarification zone includes inclined plates arranged at equal intervals in sequence to form an inclined plate clarification zone (11). The water outlet area includes an overflow trough (12) located above the clarification area, and a drain outlet (13) is provided on the overflow trough (12), which is located on the side wall of the tank.

2. The nucleus granulation apparatus according to claim 1, characterized in that, The surface of the annular water distribution pipe has several small holes facing upwards towards the center of the annular water distribution pipe. Among them, the small holes on the first annular water distribution pipe (1) are set upwards, the small holes on the third annular water distribution pipe (3) are set downwards, and the small holes on the second annular water distribution pipe (2) are set horizontally. The substances sprayed by the three annular water distribution pipes are mixed at the center of the second annular water distribution pipe (2).

3. The nucleus granulation apparatus according to claim 1, characterized in that, The sewage discharge device is a sludge pipe (4).

4. The nucleus granulation apparatus according to claim 1, characterized in that, The concentration zone (9) includes a concentration tank, which is a conical concentration tank; The water flow disperser (15) includes a bottom bearing and an umbrella-shaped structure located at the upper end of the bearing. The umbrella-shaped structure can be rotated by a motor at its bottom. A number of triangular pointed protrusions are arranged on the surface of the umbrella-shaped structure, and the triangular pointed protrusions are arranged around the surface of the umbrella-shaped structure. The umbrella-shaped structure forms an angle of 20-65 degrees with the horizontal plane, and the triangular pointed structure protrudes obliquely towards the vertical bearing position, with the triangular pointed structure protruding at an angle of 45-60 degrees to the vertical bearing.

5. The nucleus granulation apparatus according to claim 1, characterized in that, The packing device (14) includes a packing frame, which is composed of individual laminar flow units. The individual laminar flow units are arranged in left-right layers, with several individual laminar flow units arranged in each layer. The individual laminar flow unit is a square / rectangular tube; The square / rectangular tube is inclined at an angle of 75° to 55°. The square / rectangular tubes are set at an angle, with one layer tilted to the left and the other to the right, with intervals between them; The inclined square / rectangular tube has inward and outward inclined square / rectangular tubes on both sides; The inclination angle of the square / rectangular tube is 75°~55°.

6. A method for operating a nucleogranulation apparatus according to any one of claims 1-5, characterized in that, Water enters through annular water distribution pipe one (1) and annular water distribution pipe three (3). The mixed reagent enters through annular water distribution pipe two (2). The diameter of the annular water distribution pipe is larger than that of the central hollow barrel (7). The water flowing back from the concentration zone (9) flows upward through the area formed by the hollow barrel (7) and the outer wall of the overall device, i.e., the granulation reaction zone (5). After reaching the concentration zone (9), some of the water is pumped by the axial flow pump (6) into the interior of the central hollow barrel (7) until it reaches the annular water distribution pipe one (1), annular water distribution pipe two (2), and annular water distribution pipe three (3). The water is evenly dispersed through the water flow disperser (15) to make the water flow turbulent and make the substances inside the liquid evenly mixed. After passing through the granulation reaction zone (5), it flows through the concentration zone (9) for sludge concentration. Then, the sludge is separated from the water by the packing device (14) in the separation zone (10). It reaches the inclined plate clarification zone (11) to settle smaller sludge particles. Finally, the clear water flows out through the overflow tank (12) and is discharged from the device through the drain outlet (13). The sludge settled in the device is discharged through the sludge pipe (4). The function of the first ring water distribution pipe (1), the second ring water distribution pipe (2), and the third ring water distribution pipe (3) is to distribute water evenly so that the agent can fully react with the impurities in the sewage. After the raw water enters from the bottom of the device, the pre-added seed crystals are suspended in the tank in a fluidized state through the second ring water distribution pipe (2). Then the incoming water and the added alkaline chemical reagents are fully mixed in the granulation reaction zone (5), the concentration zone (9) and the hollow barrel (7) so that the ions in the water adhere to the surface of the seed crystals in a heterogeneous crystallization manner to form ion crystals. As the water flows upward, the ionic crystals act as the crystal nuclei. Ions in the water continuously gather outside the crystal nuclei and form dense granules. The density of the granules goes through a process from low to high. The granules with lower density re-enter the central hollow barrel (7) in the separation zone (10) with the water flow and are fully mixed in the granulation reaction zone (5) until they form granules with higher density. The granules deposited at the bottom are periodically removed. The above reaction process is repeated. Most of the ions in the water form granules with the crystal nuclei, thus achieving efficient removal of hardness and impurities in the water.

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