Crystal film fluidized bed treatment system for high-hardness water treatment

Abstract

The utility model discloses a crystal film fluidized bed treatment system aiming at high-hardness water treatment, the system mainly comprises a crystallization fluidized bed and a multi-layer flat film microfiltration device, and the crystallization fluidized bed device is of an inner-layer and outer-layer cylinder structure and is provided with a slag discharge pipe, a water inlet pipe, an annular dosing pipe, an inclined pipe enhanced separation device and a water outlet pipe; the multi-layer flat membrane microfiltration equipment is provided with a water inlet pipe, a water outlet pipe, a buffer water tank, a cleaning mechanism, a metal membrane, a sludge tank and the like; when the system runs, high-hardness raw water firstly enters the crystallization fluidized bed for softening treatment, and then enters the multi-layer flat membrane microfiltration equipment for further removing hardness and turbidity after treatment; the adopted system combining the crystallization fluidized bed and the flat membrane microfiltration equipment can effectively remove the hardness and turbidity of water, flocculation and coagulation agents do not need to be added, the adverse effect of the coagulation agents on a subsequent membrane system is effectively avoided while the operation cost of the system is reduced, the hardness and turbidity of the water can be effectively removed, and the service life of the system is prolonged. Various ions in the water are synchronously removed.

Description

Technical Field

[0001] The utility model patent relates to the field of water treatment, in particular to a crystal film fluidized bed treatment system for high-hardness water treatment. Background Art

[0002] In recent years, the induced crystallization water softening technology and equipment have been widely used in the fields of municipal and industrial water treatment. Compared with the traditional chemical precipitation method, this technology has the advantages of high treatment efficiency, low operation cost, and simple system operation. In addition, during the water softening treatment process, this technology does not produce precipitation sludge. Instead, it produces dense crystalline particles containing high-purity calcium carbonate compounds, effectively avoiding the generation of intermediate wastewater and waste during treatment. The crystalline particles can be recycled, achieving zero-emission treatment in practical terms, and having good economic and environmental benefits.

[0003] The prior art discloses an induced crystallization granulation fluidized bed device. This device uses an alkaline agent as a softening agent and adds it to the equipment. Under high pH conditions, Ca 2+ is converted into CaCO3 to achieve the purpose of removing Ca 2+ in water. Mg 2+ in water mainly forms Mg(OH)2 compounds and is removed from the water. In practical applications, this device has a good removal effect on high-hardness wastewater containing Ca 2+ . For water with a relatively high content of Mg 2+ and a relatively high total hardness content, problems such as a relatively high turbidity of the effluent will occur during treatment due to the poor adhesion of Mg(OH)2 to the surface of the induced crystal seeds and some CaCO3 that cannot adhere to the surface of the crystal seeds, and subsequent treatment units are required for further treatment. Currently, the combination system of a crystallization fluidized bed + a solid-liquid separation fluidized bed is mostly used to solve the above existing problems. Since the solid-liquid separation fluidized bed device usually needs to add flocculation agents such as PAM to the device during operation, its effluent directly entering the membrane system will have a negative impact on the membrane components. Therefore, there are many limitations in the practical application of this combination system and there are problems with the operation stability of the system. Summary of the Utility Model

[0004] The purpose of the present utility model is to overcome the deficiencies in the prior art and provide a crystal film fluidized bed treatment system for high-hardness water treatment.

[0005] To solve the problems of the existing technology, the utility model discloses a crystal film fluidized bed treatment system for high-hardness water treatment, including: a support device, a slag discharge pipe, a first water inlet pipe, a chemical addition pipe, an inner cylinder, an outer cylinder, a first water outlet pipe, an inclined tube enhanced separation device and a water collection tank; the support device is arranged at the bottom of the outer cylinder; the inner cylinder is arranged inside the outer cylinder; the first water inlet pipe and the chemical addition pipe are arranged on the side wall of the outer cylinder and communicate with the inside of the inner cylinder; the mouth of the inner cylinder faces the top of the outer cylinder; the inclined tube enhanced separation device is arranged at the top of the outer cylinder, the water collection tank is connected to the inclined tube enhanced separation device, and the first water outlet pipe is connected to the water collection tank; the slag discharge pipe is arranged at the bottom of the outer cylinder.

[0006] Further, the inclined tube enhanced separation device can adopt an inclined tube / lamella sedimentation device.

[0007] Further, the chemical addition pipe is an annular chemical addition pipe, and a plurality of chemical addition ports are uniformly arranged on the annular chemical addition pipe.

[0008] Further, the water collection tank is an annular water collection tank.

[0009] Further, the outer cylinder includes a bottom cylinder body, a middle cylinder body and a top cylinder body; the diameter of the top cylinder body is larger than that of the middle cylinder body; the diameter of the middle cylinder body is larger than that of the bottom cylinder body; the bottom cylinder body is connected to the middle cylinder body through a first diameter-changing rib plate; the middle cylinder body is connected to the top cylinder body through a second diameter-changing rib plate.

[0010] Further, it includes: a second water inlet pipe, a filtration device and a second water outlet pipe; one end of the second water inlet pipe is connected to the first water outlet pipe, and the other end is connected to the input port of the filtration device; the second water outlet pipe is connected to the output port of the filtration device.

[0011] Further, the filtration device includes: a buffer water tank and a filtration structure, the second water inlet pipe is connected to the buffer water tank, and the buffer water tank is connected to the second water outlet pipe through the filtration structure.

[0012] Further, the filtration structure includes a plurality of layers arranged on the extension part of the buffer water tank, and each layer of the extension part is connected to the second water outlet pipe through a metal membrane.

[0013] Further, the metal membrane is inclined, and the side close to the buffer water tank is higher than the side close to the second water outlet pipe.

[0014] Further, each layer of the metal membrane is provided with a cleaning mechanism, and a sludge pool is arranged below the metal membrane.

[0015] The beneficial effects of the utility model are as follows:

[0016] (Ⅰ) The system combining the crystallization fluidized bed and the flat membrane microfiltration equipment adopted by the utility model can obtain good Ca 2+While achieving the removal effect, it effectively removes Mg in water 2+ content. At the same time, the turbidity of the system effluent is controlled below 5 NTU, with good softening effect and stable effluent water quality;

[0017] (II)Compared with the combined system of a crystallization fluidized bed and a solid-liquid separation fluidized bed, the present utility model does not require the addition of flocculation and coagulation agents. While reducing the operation cost of the system, it effectively avoids the adverse effects of coagulation agents on the subsequent membrane system, and the system has good adaptability;

[0018] (III)When the present utility model conducts water quality softening treatment, calcium carbonate crystal particles are generated in the crystallization fluidized bed part. When the multi-layer flat membrane microfiltration equipment conducts turbidity removal treatment on the softened water, it is a physical process, effectively reducing a large amount of sludge generated due to the addition of flocculants and coagulants, and having good ecological benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic structural diagram of the present utility model;

[0020] Figure 2 is a schematic diagram of the filtering equipment mechanism in the present utility model;

[0021] Reference numerals:

[0022] 1 - support device, 2 - slag discharge pipe, 3 - first water inlet pipe, 4 - chemical addition pipe, 5 - inner cylinder, 6 - outer cylinder, 6-1 - bottom cylinder body, 6-2 - middle cylinder body, 6-3 - top cylinder body, 7 - first water outlet pipe, 8 - inclined tube enhanced separation device, 9 - water collection tank, 10-1 - first variable diameter rib plate, 10-2 - second variable diameter rib plate, 11 - second water inlet pipe, 12 - second water outlet pipe, 13 - buffer water tank, 14 - cleaning mechanism, 15 - metal membrane, 16 - silt pond, 17 - extension part. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] The present utility model will be further described below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present utility model and cannot be used to limit the protection scope of the present utility model. Embodiment

[0024] As Figure 1As shown in the figure, this embodiment provides a crystal film fluidized bed treatment system for high-hardness wastewater treatment, which consists of two parts: a crystallization fluidized bed and a filtration device; the crystallization fluidized bed includes: a support device 1, a slag discharge pipe 2, a first water inlet pipe 3, a chemical addition pipe 4, an inner cylinder 5, an outer cylinder 6, a first water outlet pipe 7, an inclined tube enhanced separation device 8 and a water collection tank 9; the support device 1 is arranged at the bottom of the outer cylinder 6; the inner cylinder 5 is arranged inside the outer cylinder 6; the first water inlet pipe 3 and the chemical addition pipe 4 are arranged on the side wall of the outer cylinder 6 and communicate with the inside of the inner cylinder 5; the mouth of the inner cylinder 5 faces the top of the outer cylinder 6; the inclined tube enhanced separation device 8 is arranged at the top of the outer cylinder 6, the water collection tank 9 is connected to the inclined tube enhanced separation device 8, and the first water outlet pipe 7 is connected to the water collection tank 9; the slag discharge pipe 2 is arranged at the bottom of the outer cylinder 6. The chemical addition pipe 4 preferably adopts an annular chemical addition pipe, and a number of chemical addition ports are uniformly arranged on the annular chemical addition pipe. The water collection tank 9 is an annular water collection tank. The outer cylinder 6 includes a bottom cylinder body 6-1, a middle cylinder body 6-2 and a top cylinder body 6-3; the diameter of the top cylinder body 6-3 is larger than that of the middle cylinder body 6-2; the diameter of the middle cylinder body 6-2 is larger than that of the bottom cylinder body 6-1; the bottom cylinder body 6-1 is connected to the middle cylinder body 6-2 through a first variable diameter rib plate 10-1; the middle cylinder body 6-2 is connected to the top cylinder body 6-3 through a second variable diameter rib plate 10-2; the outer cylinder 6 is integrally in a spiral structure, which is convenient for solid-liquid separation. Embodiment

[0025] As Figure 2 shown, the filtration device includes: a second water inlet pipe 11, a second water outlet pipe 12, a buffer water tank 13, a cleaning mechanism 14, a metal membrane 15 and a sludge pool 16; one end of the second water inlet pipe 11 is connected to the first water outlet pipe 7, and the other end is connected to the buffer water tank 13; the buffer water tank 13 is located on the upper side of the device, there is an opening on the side of the buffer water tank 13, and the extension part 17 is arranged at the position where the opening extends outward, and the opening is arranged corresponding to the metal membrane 15 one by one; the number of layers of the metal membrane 15 is at least two layers and is arranged at intervals in the vertical direction, and when the cleaning mechanism 14 operates, it moves along the direction parallel to the metal membrane 15 and sprays and cleans each position of the metal membrane; the metal membrane 15 is inclined and is located on the higher side close to the buffer water tank 13, and the sludge pool 16 is arranged on the lower side.

[0026] The operation method of the crystal film fluidized bed treatment system for high-hardness wastewater treatment in the above embodiment is as follows:

[0027] The crystallization fluidized bed part is mainly used for removing a large amount of Ca 2+ and a small amount of Mg 2+ in water, and the filtration device is mainly used for removing a large amount of Mg 2+ , the remaining Ca 2+ and suspended solids in water.

[0028] The raw water has a high hardness and the contents of Ca 2+ and Mg 2+ are close. In the crystallization fluidized bed, NaOH is selected as the softening agent, and garnet particles within a certain particle size range are selected as the induced crystal seeds;

[0029] The high-hardness raw water enters the inner cylinder 5 through the first inlet pipe 3, and is fully mixed with the pre-added induced crystal seeds under the action of hydraulic agitation. NaOH enters the inner cylinder 5 through the chemical dosing pipe 4 and is mixed with the raw water to form an alkaline condition, which promotes the reaction of Ca 2+ with CO3 2- to generate CaCO3 crystals. Mg 2+ in the water reacts with OH - to form Mg(OH)2. The mixed solution in the inner cylinder 5 enters the outer cylinder 6 in an upflow manner. The formed CaCO3 adheres to the surface of the induced crystal seeds and solid-liquid separation is carried out in the outer cylinder 6. The crystalline particles flow back from the bottom of the inner cylinder 5 for cyclic crystallization. The CaCO3 crystals that are not effectively attached to the surface of the induced crystal seeds and Mg(OH)2 achieve solid-liquid separation when passing through the inclined tube enhanced separation device 8. The softened effluent is collected by the collecting tank 9 and discharged from the fluidized bed through the first outlet pipe 7. With the continuous and stable operation of the fluidized bed, the surface of the induced crystal seeds is continuously attached with crystals to achieve an increase in particle size. The larger-particle-size particles continuously accumulate at the bottom of the outer cylinder 6 and are finally discharged through the slag discharge pipe 2;

[0030] The effluent of the crystallization fluidized bed enters the buffer tank 13 through the second inlet pipe 11, passes through the extension part 17 corresponding to each layer of the metal membrane 15 and penetrates through the metal membrane 15. The filtered water flows out of the device through the second outlet pipe 12. The CaCO3 crystals, Mg(OH)2 and other suspended substances that are not effectively removed in the crystallization fluidized bed are intercepted on the surface of the metal membrane 15, and are cleaned and discharged into the sludge tank 16 for disposal by the cleaning mechanism 14 in a high-frequency and rapid cleaning manner.

[0031] The overall structure of the system of the present utility model is clear, the connection of each functional unit is compact, the operation is convenient, and it can effectively remove the hardness and turbidity in the water, and can also simultaneously remove various ions in the water.

[0032] As can be seen from the above, the water treatment system of the present utility model improves the disadvantages of poor removal effects of turbidity and Mg 2+ compounds by a single device in the prior art. At the same time, the pure physical method without additional dosing of flocculants and coagulants can effectively remove turbidity while avoiding the influence of the agents on the subsequent membrane treatment system.

[0033] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. At the same time, in the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation on the present utility model. Also, in the drawings of the present utility model, the filling patterns are only for differentiating layers and are not subject to any other limitations.

[0034] Although the embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present utility model, and the scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A crystal film fluidized bed treatment system for high-hardness water treatment, characterized in that, Comprising: A support device (1), a slag discharge pipe (2), a first water inlet pipe (3), a chemical dosing pipe (4), an inner cylinder (5), an outer cylinder (6), a first water outlet pipe (7), an inclined tube enhanced separation device (8) and a water collecting tank (9); The support device (1) is arranged at the bottom of the outer cylinder (6); The inner cylinder (5) is arranged inside the outer cylinder (6); The first water inlet pipe (3) and the chemical dosing pipe (4) are arranged on the side wall of the outer cylinder (6) and communicate with the inside of the inner cylinder (5); The mouth of the inner cylinder (5) faces the top of the outer cylinder (6); The inclined tube enhanced separation device (8) is arranged at the top of the outer cylinder (6), the water collecting tank (9) is connected to the inclined tube enhanced separation device (8), and the first water outlet pipe (7) is connected to the water collecting tank (9); The slag discharge pipe (2) is arranged at the bottom of the outer cylinder (6).

2. The crystal film fluidized bed treatment system for high-hardness water treatment according to claim 1, characterized in that The inclined tube enhanced separation device (8) adopts an inclined tube or an inclined plate sedimentation device.

3. The crystal film fluidized bed treatment system for high-hardness water treatment according to claim 1, characterized in that The chemical dosing pipe (4) is an annular chemical dosing pipe, and a plurality of chemical dosing ports are uniformly arranged on the annular chemical dosing pipe.

4. The crystal film fluidized bed treatment system for high-hardness water treatment according to claim 1, wherein The water collecting tank (9) is an annular water collecting tank.

5. The crystal film fluidized bed treatment system for high-hardness water treatment according to claim 1, characterized in that, The outer cylinder (6) includes a bottom cylinder body (6-1), a middle cylinder body (6-2) and a top cylinder body (6-3); The diameter of the top cylinder body (6-3) is larger than that of the middle cylinder body (6-2); The diameter of the middle cylinder body (6-2) is larger than that of the bottom cylinder body (6-1); the bottom cylinder body (6-1) is connected to the middle cylinder body (6-2) through a first diameter-changing rib plate (10-1); the middle cylinder body (6-2) is connected to the top cylinder body (6-3) through a second diameter-changing rib plate (10-2).

6. The crystal film fluidized bed treatment system for high-hardness water treatment according to claim 1, characterized in that, Further comprising: A second water inlet pipe (11), a filtering device and a second water outlet pipe (12); one end of the second water inlet pipe (11) is connected to the first water outlet pipe (7), and the other end is connected to the input port of the filtering device; the second water outlet pipe (12) is connected to the output port of the filtering device.

7. The crystal film fluidized bed treatment system for high-hardness water treatment according to claim 6, characterized in that, The filtering device includes: a buffer water tank (13) and a filtering structure, the second water inlet pipe (11) is connected to the buffer water tank (13), and the buffer water tank (13) is connected to the second water outlet pipe (12) through the filtering structure.

8. The crystal film fluidized bed treatment system for high-hardness water treatment according to claim 7, characterized in that, The filtering structure includes a plurality of layers arranged at the extension part (17) of the buffer water tank (13), and each layer of the extension part (17) is connected to the second water outlet pipe (12) through a metal membrane (15).

9. The crystal film fluidized bed treatment system for high-hardness water treatment according to claim 8, characterized in that, The metal membrane (15) is inclined, and the side close to the buffer water tank (13) is higher than the side close to the second water outlet pipe (12).

10. The crystal film fluidized bed treatment system for high-hardness water treatment according to claim 9, characterized in that, Each layer of the metal membrane (15) is provided with a cleaning mechanism (14), and a sludge pool (16) is arranged below the metal membrane.

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