Hardness removal and turbidity reduction water treatment system based on gravity ultrafiltration and crystallization granulation fluidized bed

Abstract

This utility model discloses a hardness and turbidity reduction water treatment system based on gravity ultrafiltration and crystallization granulation fluidized bed, comprising: a water intake tank, a fluidized bed water intake pump, a crystallization granulation fluidized bed, and a gravity-driven ultrafiltration tank connected in sequence; the outlet pipe of the crystallization granulation fluidized bed is set higher than that of the gravity-driven ultrafiltration tank; the dosing zone of the crystallization granulation fluidized bed is equipped with sodium hydroxide reagent; the top of the crystallization granulation fluidized bed is equipped with a staggered vertical flow plate structure, and the vertical flow plate structure is also equipped with several triangular pyramids for improving the degree of mixing; this utility model can improve the turbulence state and mixing effect of water flow through the high-efficiency mixing zone, and with the initial pretreatment of the influent, it can achieve efficient mixing during acid adjustment and accurately restore the raw water to neutral; the gravity potential energy of the outlet water can replace the power supply tank of the gravity-driven ultrafiltration, eliminating the need for an additional water pump to power the tank and simplifying the overall water treatment system structure.

Description

Technical Field

[0001] This utility model relates to the field of water treatment, and in particular to a hardness removal and turbidity reduction water treatment system based on gravity ultrafiltration and crystallization granulation fluidized bed. Background Technology

[0002] In the field of water treatment, the removal of hardness and turbidity from raw water is a crucial step in ensuring the stable operation of subsequent processes and the quality of end-use water, and it is widely used in many important scenarios. For example, the influent of core water treatment equipment such as reverse osmosis (RO), nanofiltration, and ion exchangers needs to have turbidity and scaling ions such as calcium and magnesium removed in advance to avoid scaling or membrane fouling inside the equipment and to ensure treatment efficiency and service life. At the same time, special water use scenarios such as boiler water supply, pharmaceutical water preparation, and pure water preparation also have strict requirements on the turbidity and scaling ion content of the influent. Boiler water supply needs to prevent scaling to avoid safety hazards, while pharmaceutical water and pure water preparation need to meet high-purity water quality standards through hardness and turbidity removal.

[0003] To achieve hardness and turbidity removal in raw water, various technical solutions have been developed in the industry. Among them, crystallization granulation fluidized bed and gravity-driven ultrafiltration are two typical technologies, each with its own specific working principle and application advantages, as detailed below:

[0004] (1) Crystallization granulation fluidized bed: This equipment integrates the crystallization process and the granulation process. Its core mechanism is: under fluidized state, by precisely controlling the supersaturation of the solution, the hardness ions such as calcium and magnesium in the water are crystallized and precipitated in the form of solute, thereby achieving hardness removal; at the same time, by utilizing the collision and aggregation between particles in the fluidized environment and the growth of crystals themselves, granular products with specific particle size and mechanical strength can be formed, which have the potential for both hardness removal and solids recovery.

[0005] (2) Gravity-driven ultrafiltration: As a low-energy membrane separation technology, it uses gravity potential energy as the sole driving force. It generates hydrostatic pressure through the natural drop of water, which drives the water flow to pass through the ultrafiltration membrane autonomously. By using the membrane's retention function, it achieves the separation and purification of pollutants such as turbidity and colloids in the water. Compared with the traditional ultrafiltration technology that relies on water pump pressurization, this device has significant advantages such as low energy consumption, simple operation, and low operating cost, and has outstanding application potential in energy-saving water treatment scenarios.

[0006] However, although the above technologies can achieve the functions of removing hardness and turbidity, there are still obvious defects in practical applications, which restrict their performance optimization and widespread application, as follows:

[0007] (1) Regarding the crystallization granulation fluidized bed: When this technology is running, the pH value of the treated water needs to be adjusted to 11 or above. In a high pH environment, the alkalinity in the water is mostly in the form of carbonate, which is easy to combine with calcium ions to form calcium carbonate precipitate. Moreover, the effluent has too high pH and alkalinity, and cannot be directly adapted to subsequent processes. For example, when the downstream is equipped with membrane equipment such as RO or nanofiltration, in order to prevent the equipment from generating calcium carbonate scale during the concentration process, hydrochloric acid or sulfuric acid needs to be added to adjust the pH of the effluent back to neutral or weakly acidic. A reagent mixing device also needs to be set up, which not only increases the consumption of reagents and treatment costs, but also increases the complexity of the process.

[0008] (2) Defects of gravity-driven ultrafiltration tank: The core advantage of this device (low energy consumption) depends on the premise that "gravitational potential energy is the only driving force"; if in actual application, in order to maintain the water level of the high water tank to ensure the natural drop, an additional water pump is used to power the water tank, the low energy consumption advantage will be directly lost, resulting in a significant weakening of its differentiated competitiveness with traditional pressurized ultrafiltration technology, and it will be unable to play its energy-saving application value. Utility Model Content

[0009] The main objective of this invention is to provide a hardness and turbidity reduction water treatment system based on gravity ultrafiltration and crystallization granulation fluidized bed, thereby solving all or one of the aforementioned problems in the prior art.

[0010] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a hardness and turbidity reduction water treatment system based on gravity ultrafiltration and crystallization granulation fluidized bed, comprising:

[0011] The water intake tank, fluidized bed water intake pump, crystallization granulation fluidized bed and gravity-driven ultrafiltration tank are connected in sequence.

[0012] The outlet pipe of the crystallizing granulation fluidized bed is set higher than the gravity-driven ultrafiltration tank. The dosing zone of the crystallizing granulation fluidized bed is equipped with sodium hydroxide agent. The top of the crystallizing granulation fluidized bed is equipped with a high-efficiency mixing zone. The high-efficiency mixing zone is equipped with a staggered vertical flow plate structure. The vertical flow plate structure and the high-efficiency mixing zone are also equipped with several triangular pyramids to improve the degree of mixing.

[0013] The water tank is used to store water samples to be treated;

[0014] The fluidized bed water intake pump is used to transfer the water sample to be treated in the water intake tank to the crystallization granulation fluidized bed;

[0015] The crystallization granulation fluidized bed is used to remove hardness from the incoming water sample.

[0016] The gravity-driven ultrafiltration tank is used to reduce the turbidity of the water sample after hardening treatment that falls from the effluent pipe of the crystallizing granulation fluidized bed.

[0017] As an improved solution, one end of the fluidized bed water intake pump is connected to the water intake tank, and the other end of the fluidized bed water intake pump is connected to the water inlet pipeline of the crystallization granulation fluidized bed through an inlet control valve.

[0018] The water inlet control valve is used to control the water intake flow rate of the fluidized bed water intake pump.

[0019] As an improved solution, the water supply capacity of the fluidized bed intake pump is matched with the treatment capacity of the gravity-driven ultrafiltration tank.

[0020] As an improved solution, the high-efficiency mixing zone is cylindrical, with an open top and a hollow design. The high-efficiency mixing zone is fitted onto the top of the crystallization granulation fluidized bed, and the top of the inner wall at the center of the high-efficiency mixing zone is the overflow weir of the crystallization granulation fluidized bed.

[0021] The staggered vertical flow plate structure includes: a first annular vertical flow plate and a second annular vertical flow plate located within the high-efficiency mixing zone and arranged circumferentially along the high-efficiency mixing zone;

[0022] The first annular vertical flow plate is disposed near the outer wall of the high-efficiency mixing zone, and the second annular vertical flow plate is disposed near the inner wall of the center of the high-efficiency mixing zone. A distance is provided between the first annular vertical flow plate and the second annular vertical flow plate, and a distance is provided between the first annular vertical flow plate and the outer wall of the high-efficiency mixing zone, and a distance is provided between the second annular vertical flow plate and the inner wall of the center of the high-efficiency mixing zone. A first overflow area is formed between the outer wall of the high-efficiency mixing zone and the first annular vertical flow plate, a second overflow area is formed between the first annular vertical flow plate and the second annular vertical flow plate, and a third overflow area is formed between the second annular vertical flow plate and the inner wall of the center of the high-efficiency mixing zone.

[0023] A plurality of triangular pyramids are uniformly arranged around the center of the high-efficiency mixing zone on the inner surface of the outer wall of the high-efficiency mixing zone, the inner and outer surfaces of the first annular vertical flow plate, the inner and outer surfaces of the second annular vertical flow plate, and the outer surface of the inner wall at the center of the high-efficiency mixing zone.

[0024] The triangular pyramids on both sides of the first overflow area, the triangular pyramids on both sides of the second overflow area, and the triangular pyramids on both sides of the third overflow area are respectively oriented towards each other and arranged in a corresponding peak-valley pattern.

[0025] As an improved solution, the first annular vertical flow plate is connected to the bottom of the high-efficiency mixing zone, and the top of the first annular vertical flow plate is set lower than the outer wall of the high-efficiency mixing zone;

[0026] The top of the second annular vertical flow plate is set higher than the outer wall of the high-efficiency mixing zone, and there is a distance between the bottom of the second annular vertical flow plate and the bottom of the high-efficiency mixing zone. The two sides of the bottom of the second annular vertical flow plate are connected to the upper surface of the bottom of the high-efficiency mixing zone.

[0027] As an improved solution, the outlet pipe is connected to the bottom of the high-efficiency mixing zone near the gravity-driven ultrafiltration tank, and the outlet pipe is in communication with the interior of the high-efficiency mixing zone.

[0028] As an improvement, an acidic agent is added to the top effluent position of the crystallizing granulation fluidized bed.

[0029] As an improved option, the acidic agent is hydrochloric acid or sulfuric acid.

[0030] As an improved solution, the gravity-driven ultrafiltration tank is located below the effluent pipe, and a submerged hollow fiber ultrafiltration membrane module is horizontally arranged in the gravity-driven ultrafiltration tank.

[0031] The submerged hollow fiber ultrafiltration membrane module is positioned above the bottom of the gravity-driven ultrafiltration tank and below the top of the gravity-driven ultrafiltration tank.

[0032] As an improved solution, the vertical distance between the outlet pipe and the submerged hollow fiber ultrafiltration membrane module is not less than three meters.

[0033] The beneficial effects of this utility model are as follows: The water treatment system for hardening and turbidity reduction based on gravity ultrafiltration and crystallization granulation fluidized bed described in this utility model can improve the turbulence state and mixing effect of water flow by improving the outlet area of ​​the crystallization granulation fluidized bed. Combined with the preliminary pretreatment of the influent before gravity ultrafiltration, it can achieve efficient mixing during acid adjustment, accurately restore the raw water to neutral, simplify the acid mixing process, eliminate the need for additional complex mixing devices, and reduce the cost of reagent consumption and operational complexity. Furthermore, the gravity potential energy of the outlet water from the crystallization granulation fluidized bed outlet pipe can directly replace the power supply tank for gravity-driven ultrafiltration, eliminating the need for an additional water pump to power the tank. This retains the low-energy consumption core advantage of gravity ultrafiltration while reducing the investment in tank equipment and simplifying the overall water treatment system structure. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the architecture of a hardness removal and turbidity reduction water treatment system based on gravity ultrafiltration and crystallization granulation fluidized bed in an embodiment of this utility model;

[0035] Figure 2This is a three-dimensional structural diagram of the crystallization granulation fluidized bed in a hardness removal and turbidity reduction water treatment system based on gravity ultrafiltration and crystallization granulation fluidized bed according to an embodiment of this utility model.

[0036] Figure 3 This is a top view schematic diagram of the crystallization granulation fluidized bed in a hardness removal and turbidity reduction water treatment system based on gravity ultrafiltration and crystallization granulation fluidized bed according to an embodiment of this utility model;

[0037] Figure 4 This is a schematic diagram of the AA cross-sectional structure of the crystallization granulation fluidized bed in a hardness removal and turbidity reduction water treatment system based on gravity ultrafiltration and crystallization granulation fluidized bed in an embodiment of this utility model.

[0038] Figure 5 This is a schematic diagram of the AA cross-sectional structure of the crystallizing fluidized bed in a hardness removal and turbidity reduction water treatment system based on gravity ultrafiltration and crystallizing granulation fluidized bed in an embodiment of this utility model, viewed from another perspective.

[0039] Figure 6 yes Figure 5 Enlarged structural diagram at point A;

[0040] The components in the attached diagram are labeled as follows:

[0041] 1. Water sampling tank; 101. Water sample to be treated;

[0042] 2. Fluidized bed intake pump; 201. Inlet control valve;

[0043] 3. Crystallization granulation fluidized bed; 301. Water outlet pipe; 302. Water inlet pipe; 303. Water inlet area; 304. Overflow weir; 305. First annular vertical flow plate; 306. Second annular vertical flow plate; 307. Triangular pyramid; 308. Connecting parts; 309. High-efficiency mixing zone;

[0044] 4. Gravity-driven ultrafiltration tank; 401. Submerged hollow fiber ultrafiltration membrane module; 402. Ultrafiltration outlet valve; 403. Ultrafiltration inlet valve. Detailed Implementation

[0045] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the scope of protection of the present invention.

[0046] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0047] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0048] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0049] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0050] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

[0051] Please see Figures 1-6 The embodiments of this utility model include:

[0052] A water hardening and turbidity reduction system based on gravity ultrafiltration and crystallization granulation fluidized bed includes: a water intake tank 1, a fluidized bed water intake pump 2, a crystallization granulation fluidized bed 3, and a gravity-driven ultrafiltration tank 4 connected in sequence.

[0053] (1) Water tank 1, used to store water sample 101 to be treated;

[0054] (2) Fluidized bed water intake pump 2, one end is connected to water intake tank 1, and the other end is connected to crystallization granulation fluidized bed 3 through water inlet control valve 201; Fluidized bed water intake pump 2 is used to take water from water intake tank 1. The water intake flow rate is controlled by adjusting water inlet control valve 201 so that the water supply of fluidized bed water intake pump 2 is consistent with the treatment capacity of gravity driven ultrafiltration tank 4, while keeping the water level of water outlet pipe 301 in the collection area of ​​crystallization granulation fluidized bed 3 at a constant position;

[0055] (3) The crystallization granulation fluidized bed 3 has an inlet pipe 302 connected to an inlet control valve 201, and an outlet pipe 301 equipped with a corresponding ultrafiltration inlet valve 403; the top of the crystallization granulation fluidized bed 3 is provided with a high-efficiency mixing zone 309, which is cylindrical with an open top and a hollow design. The high-efficiency mixing zone 309 is fitted at the top of the crystallization granulation fluidized bed 3, and the top of the inner wall at the center of the high-efficiency mixing zone 309 is the overflow weir 304; the first ring arranged around the circumference of the high-efficiency mixing zone 309... A vertical flow plate 305 and a second annular vertical flow plate 306 are provided. The first annular vertical flow plate 305 is positioned near the outer wall of the high-efficiency mixing zone 309, and the second annular vertical flow plate 306 is positioned near the inner wall of the center of the high-efficiency mixing zone 309. A distance is provided between the first annular vertical flow plate 305 and the second annular vertical flow plate 306. A distance is also provided between the first annular vertical flow plate 305 and the outer wall of the high-efficiency mixing zone 309, and between the second annular vertical flow plate 306 and the inner wall of the center of the high-efficiency mixing zone 309. The water outlet pipe 301 is connected to... The high-efficiency mixing zone 309 is located near the bottom of the gravity-driven ultrafiltration tank 4, and the outlet pipe 301 is connected to the interior of the high-efficiency mixing zone 309. A first overflow area is formed between the outer wall of the high-efficiency mixing zone 309 and the first annular vertical flow plate 305, a second overflow area is formed between the first annular vertical flow plate 305 and the second annular vertical flow plate 306, and a third overflow area is formed between the second annular vertical flow plate 306 and the inner wall at the center of the high-efficiency mixing zone 309. To enhance the turbulence effect, the inner surface of the outer wall of the high-efficiency mixing zone 309 and the first annular vertical flow plate 305 are connected. On the inner and outer surfaces of the first overflow area, the inner and outer surfaces of the second annular vertical flow plate 306, and the outer surface of the inner wall at the center of the high-efficiency mixing zone 309, a plurality of triangular pyramids 307 are uniformly arranged around the center of the high-efficiency mixing zone 309. The triangular pyramids 307 on both sides of the first overflow area face each other and are arranged in a corresponding peak and trough pattern. The triangular pyramids 307 on both sides of the second overflow area face each other and are arranged in a corresponding peak and trough pattern. The triangular pyramids 307 on both sides of the third overflow area face each other and are arranged in a corresponding peak and trough pattern.

[0056] In one embodiment of this utility model, to ensure better overflow function, the first annular vertical flow plate 305 is connected to the bottom of the high-efficiency mixing zone 309, and the top of the first annular vertical flow plate 305 is set lower than the top of the outer wall of the high-efficiency mixing zone 309; the top of the second annular vertical flow plate 306 is set slightly higher than the top of the outer wall of the high-efficiency mixing zone 309, and there is a distance between the bottom of the second annular vertical flow plate 306 and the bottom of the high-efficiency mixing zone 309. The two sides of the bottom of the second annular vertical flow plate 306 are respectively connected to the upper surface of the bottom of the high-efficiency mixing zone 309 through two connectors 308. The connectors 308 are small in size and do not affect the flow of medium at the bottom of the second annular vertical flow plate 306.

[0057] As one embodiment of this utility model, sodium hydroxide is added to the dosing tray at the bottom of the crystallization granulation fluidized bed 3 to keep the pH of the wastewater in the reaction zone of the crystallization granulation fluidized bed 3 at 11 or above.

[0058] As one embodiment of this utility model, hydrochloric acid / sulfuric acid is added to the top outlet of the crystallizing granulation fluidized bed 3. When the water passes through the triangular pyramid 307 of the high-efficiency mixing zone 309, the turbulence effect is enhanced, and the uniform mixing effect is achieved. The water outlet of the crystallizing granulation fluidized bed 3 is precisely and effectively returned to neutral.

[0059] (4) A gravity-driven ultrafiltration tank 4 is located below the effluent pipe 301 of the crystallization granulation fluidized bed 3, and an ultrafiltration effluent valve 402 is installed on the effluent pipe; an submerged hollow fiber ultrafiltration membrane module 401 is installed in the gravity-driven ultrafiltration tank 4, and the submerged hollow fiber ultrafiltration membrane module 401 is set above the bottom of the gravity-driven ultrafiltration tank 4 and below the top of the gravity-driven ultrafiltration tank 4; the vertical distance between the effluent pipe 301 of the crystallization granulation fluidized bed 3 and the submerged hollow fiber ultrafiltration membrane module 401 is not less than 3m.

[0060] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structure made using the contents of this utility model specification and drawings, or directly or indirectly applied to other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A hardness and turbidity reduction water treatment system based on gravity ultrafiltration and crystallization granulation fluidized bed, characterized in that, include: The water intake tank (1), the fluidized bed water intake pump (2), the crystallization granulation fluidized bed (3), and the gravity-driven ultrafiltration tank (4) are connected in sequence. The outlet pipe (301) of the crystallizing granulation fluidized bed (3) is set higher than the gravity-driven ultrafiltration tank (4). The dosing zone of the crystallizing granulation fluidized bed (3) is provided with sodium hydroxide agent. The top of the crystallizing granulation fluidized bed (3) is provided with a high-efficiency mixing zone (309). The high-efficiency mixing zone (309) is provided with a staggered vertical flow plate structure. The vertical flow plate structure and the high-efficiency mixing zone (309) are also provided with a number of triangular pyramids (307) to improve the degree of mixing. The water tank (1) is used to store the water sample (101) to be treated; The fluidized bed water pump (2) is used to transfer the water sample (101) to be treated in the water tank (1) to the crystallization granulation fluidized bed (3); The crystallization granulation fluidized bed (3) is used to remove hardness from the water sample (101) that has been transported. The gravity-driven ultrafiltration tank (4) is used to reduce the turbidity of the water sample after hardening treatment that falls from the effluent pipe (301) of the crystallizing granulation fluidized bed (3).

2. The water hardness removal and turbidity reduction system based on gravity ultrafiltration and crystallization granulation fluidized bed according to claim 1, characterized in that: One end of the fluidized bed water pump (2) is connected to the water tank (1), and the other end of the fluidized bed water pump (2) is connected to the water inlet pipe (302) of the crystallization granulation fluidized bed (3) through the water inlet control valve (201). The water inlet control valve (201) is used to control the water intake flow rate of the fluidized bed water intake pump (2).

3. The water hardness removal and turbidity reduction system based on gravity ultrafiltration and crystallization granulation fluidized bed according to claim 2, characterized in that: The water supply of the fluidized bed water pump (2) is matched with the treatment capacity of the gravity-driven ultrafiltration tank (4).

4. The water hardness removal and turbidity reduction system based on gravity ultrafiltration and crystallization granulation fluidized bed according to claim 1, characterized in that: The high-efficiency mixing zone (309) is cylindrical, with an open top and a hollow design. The high-efficiency mixing zone (309) is fitted onto the top of the crystallizing granulation fluidized bed (3), and the top of the inner wall of the center of the high-efficiency mixing zone (309) is the overflow weir (304) of the crystallizing granulation fluidized bed (3). The staggered vertical flow plate structure includes: a first annular vertical flow plate (305) and a second annular vertical flow plate (306) located within the high-efficiency mixing zone (309) and arranged circumferentially along the high-efficiency mixing zone (309); The first annular vertical flow plate (305) is disposed near the outer wall of the high-efficiency mixing zone (309), and the second annular vertical flow plate (306) is disposed near the inner wall of the center of the high-efficiency mixing zone (309). A distance is provided between the first annular vertical flow plate (305) and the second annular vertical flow plate (306), and a distance is provided between the first annular vertical flow plate (305) and the outer wall of the high-efficiency mixing zone (309), and a distance is provided between the second annular vertical flow plate (306) and the inner wall of the center of the high-efficiency mixing zone (309). A first overflow area is formed between the outer wall of the high-efficiency mixing zone (309) and the first annular vertical flow plate (305), a second overflow area is formed between the first annular vertical flow plate (305) and the second annular vertical flow plate (306), and a third overflow area is formed between the second annular vertical flow plate (306) and the inner wall of the center of the high-efficiency mixing zone (309). On the inner surface of the outer wall of the high-efficiency mixing zone (309), the inner and outer surfaces of the first annular vertical flow plate (305), the inner and outer surfaces of the second annular vertical flow plate (306), and the outer surface of the inner wall at the center of the high-efficiency mixing zone (309), a plurality of triangular pyramids (307) are uniformly arranged around the center of the high-efficiency mixing zone (309). The triangular pyramids (307) on both sides of the first overflow area, the triangular pyramids (307) on both sides of the second overflow area, and the triangular pyramids (307) on both sides of the third overflow area are respectively oriented towards each other and arranged in a corresponding peak-valley pattern.

5. The water hardness removal and turbidity reduction system based on gravity ultrafiltration and crystallization granulation fluidized bed according to claim 4, characterized in that: The first annular vertical flow plate (305) is connected to the bottom of the high-efficiency mixing zone (309), and the top of the first annular vertical flow plate (305) is set lower than the outer wall of the high-efficiency mixing zone (309); The top of the second annular vertical flow plate (306) is higher than the outer wall of the high-efficiency mixing zone (309), and there is a distance between the bottom of the second annular vertical flow plate (306) and the bottom of the high-efficiency mixing zone (309). The two sides of the bottom of the second annular vertical flow plate (306) are connected to the upper surface of the bottom of the high-efficiency mixing zone (309).

6. The water hardness removal and turbidity reduction system based on gravity ultrafiltration and crystallization granulation fluidized bed according to claim 1, characterized in that: The outlet pipe (301) is connected to the bottom of the high-efficiency mixing zone (309) near the gravity-driven ultrafiltration tank (4), and the outlet pipe (301) is in communication with the interior of the high-efficiency mixing zone (309).

7. The water hardness removal and turbidity reduction system based on gravity ultrafiltration and crystallization granulation fluidized bed according to claim 1, characterized in that: An acidic agent is added to the top outlet of the crystallizing granulation fluidized bed (3).

8. The water hardness removal and turbidity reduction system based on gravity ultrafiltration and crystallization granulation fluidized bed according to claim 7, characterized in that: The acidic agent is hydrochloric acid or sulfuric acid.

9. The water hardness removal and turbidity reduction system based on gravity ultrafiltration and crystallization granulation fluidized bed according to claim 1, characterized in that: The gravity-driven ultrafiltration tank (4) is located below the water outlet pipe (301), and a submerged hollow fiber ultrafiltration membrane module (401) is horizontally arranged in the gravity-driven ultrafiltration tank (4). The submerged hollow fiber ultrafiltration membrane module (401) is positioned above the bottom of the gravity-driven ultrafiltration tank (4) and below the top of the gravity-driven ultrafiltration tank (4).

10. The water hardness removal and turbidity reduction system based on gravity ultrafiltration and crystallization granulation fluidized bed according to claim 9, characterized in that: The vertical distance between the outlet pipe (301) and the submerged hollow fiber ultrafiltration membrane module (401) is not less than three meters.

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