Backwashing-free crystallization and granulation filter bed combined system for high-calcium and high-magnesium water treatment

Abstract

The utility model provides a backwashing-free crystallization granulation filter bed combined system for high-calcium and high-magnesium water treatment, which mainly comprises a crystallization fluidized bed and a backwashing-free multistage filter bed, a deslagging pipe, a water inlet pipe, an annular dosing pipe, an inclined pipe enhanced separation device and a water outlet pipe are sequentially arranged from bottom to top; the backwashing-free multi-stage filter bed system is provided with a water distributor, a cleaning device, a filter layer, a water collecting tank, a sludge tank, a sludge collecting tank, a lifting pump and the like; when the system runs, high-calcium and high-magnesium raw water firstly enters the crystallization fluidized bed for softening treatment, and then enters the backwashing-free multi-stage filter bed to further remove hardness and turbidity; the method has the advantages that Ca < 2 + > and Mg < 2 + > in water are effectively removed, the turbidity of effluent of the system can be effectively controlled, flocculation and coagulation agents do not need to be added, the operation cost of the system is reduced, the adverse effect of the coagulation agents on a subsequent membrane system is effectively avoided, and the method has good adaptability to various types of high-hardness water.

Description

Technical Field

[0001] This utility model patent relates to the field of water treatment, and in particular to a backwash-free crystallization granulation filter bed combination system for treating high-calcium and high-magnesium water. Background Art

[0002] Removing hardness from water is a hot research topic in the field of water treatment. In recent years, induced crystallization water softening technology and equipment, which removes hardness from water by chemically reacting ions in water to form insoluble crystals, has been widely used. Compared with traditional chemical precipitation methods, this technology has the advantages of high treatment efficiency, low operating costs, and simple system operation. The insoluble material formed during the water softening process by induced crystallization technology is a dense crystalline particle containing high-purity calcium carbonate compounds, which effectively avoids the generation of intermediate wastewater and waste during treatment. The crystalline particles can be recycled as a resource, achieving a practical zero-emission treatment with good economic and environmental benefits.

[0003] The prior art discloses an induced crystallization granulation fluidized bed device, which uses an alkaline agent as a softener and adds Ca 2+ Converted into CaCO3 to remove Ca 2+ The purpose of Mg in water 2+ The main form of Mg(OH)2 compounds is removed from the water. In practical applications, this device is effective for treating water containing Ca 2+ It has a good removal effect on high hardness wastewater and is suitable for Mg 2+ When treating water with high content and high total hardness, the problem of high effluent turbidity will occur due to the poor adhesion of Mg(OH)2 on the surface of the induced crystal seeds and the inability of some CaCO3 to adhere to the surface of the crystal seeds, which requires further treatment by subsequent treatment units. At present, the combination system of crystallization fluidized bed + solid-liquid separation fluidized bed is often used to solve the above problems. Since flocculants such as PAM are usually added to the solid-liquid separation fluidized bed device during operation, the effluent directly entering the membrane system will have a negative impact on the membrane components. Therefore, this combination system has many limitations in practical applications and there are problems with the stability of the system operation. Utility Model Content

[0004] The purpose of the utility model is to overcome the deficiencies in the prior art and provide a backwash-free crystallization and granulation filter bed combination system for treating high-calcium and high-magnesium water.

[0005] In order to solve the problems of the prior art, the utility model discloses a backwash-free crystallization filter bed combination system for treating high-calcium and high-magnesium water, comprising: a support device, a slag discharge pipe, a water inlet pipe, a dosing pipe, an inner cylinder, an outer cylinder, a water outlet pipe, an inclined tube enhanced separation device and a water collection tank;

[0006] The supporting device is arranged at the bottom of the outer cylinder;

[0007] The inner cylinder is arranged inside the outer cylinder;

[0008] The water inlet pipe and the drug adding pipe are arranged on the side wall of the outer cylinder and communicate with the interior of the inner cylinder;

[0009] The opening of the inner cylinder faces the top of the outer cylinder;

[0010] The inclined tube enhanced separation device is arranged on the top of the outer cylinder, the water collecting tank is connected to the inclined tube enhanced separation device, and the water outlet pipe is connected to the water collecting tank;

[0011] The slag discharge pipe is arranged at the bottom of the outer cylinder;

[0012] It also includes a multi-stage backwash-free crystallization filter bed, each stage of the backwash-free crystallization filter bed includes: a water distributor, a cleaning device, a filter layer, a water collection tank and a sludge tank; the filter layer is arranged at an angle, the starting end of the filter layer is higher than the tail end, the water distributor is connected to the starting end of the filter layer, the cleaning device is arranged above the filter layer, the water collection tank is arranged below the filter layer, and the sludge tank is arranged at the tail end of the filter layer;

[0013] Among them, the water distributor of the first-stage crystallization filter bed is connected to the outlet pipe, and in the remaining multi-stage crystallization filter beds, the water collection tank of the upper-stage crystallization filter bed is connected to the water distributor of the lower-stage crystallization filter bed through a lifting pump.

[0014] Furthermore, the inclined tube enhanced separation device adopts an inclined tube or inclined plate sedimentation device.

[0015] Furthermore, the dosing tube is an annular dosing tube, and a plurality of dosing ports are evenly arranged on the annular dosing tube.

[0016] Furthermore, the water collecting tank is an annular water collecting tank.

[0017] Furthermore, the outer cylinder includes a bottom cylinder, a middle cylinder and a top cylinder;

[0018] The diameter of the top cylinder is larger than that of the middle cylinder;

[0019] The diameter of the middle cylinder is larger than that of the bottom cylinder; the bottom cylinder is connected to the middle cylinder via a first diameter-varying rib; and the middle cylinder is connected to the top cylinder via a second diameter-varying rib.

[0020] Furthermore, it also includes a sludge collection pool, and the sludge pools of the multi-stage crystallization filter bed are commonly connected to the sludge collection pool.

[0021] Furthermore, the cleaning device is provided with guide rails along both sides of the filter layer, and a moving component containing a high-pressure nozzle is provided on the guide rail. The moving component drives the high-pressure water nozzle to spray toward the filter layer for cleaning.

[0022] The utility model has the beneficial effects:

[0023] (I) The combined system of the crystallization fluidized bed and the backwash-free multi-stage filter bed system adopted in this utility model can effectively remove Ca in high calcium and high magnesium water. 2+ and Mg 2+ , the system outlet water turbidity can be controlled below 5NTU, with good softening effect and stable outlet water quality;

[0024] (II) The effluent quality can be precisely controlled through the backwash-free multi-stage filter bed, and the multi-stage filter bed can be flexibly arranged according to the water quality requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic structural diagram of the utility model.

[0026] Reference numerals:

[0027] 1—support device, 2—slag discharge pipe, 3—water inlet pipe, 4—dosing pipe, 5—inner cylinder, 6—outer cylinder, 6-1—bottom cylinder, 6-2—middle cylinder, 6-3—top cylinder, 7—outlet pipe, 8—inclined tube enhanced separation device, 9—water collecting trough, 10-1—first variable diameter rib plate, 10-2—second variable diameter rib plate, 11—water distributor, 12—cleaning device, 13—filter layer, 14—water collecting tank, 15—sludge tank, 16—sludge collecting tank, 17—lifting pump. DETAILED DESCRIPTION

[0028] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention and are not intended to limit the scope of protection of the present invention. Example

[0029] like Figure 1As shown, this embodiment provides a backwash-free crystallization granulation filter bed combination system for treating high-calcium and high-magnesium water, consisting of a crystallization fluidized bed and a backwash-free multi-stage filter bed system. The crystallization fluidized bed includes: a support device 1, a slag discharge pipe 2, a first water inlet pipe 3, a dosing pipe 4, an inner tube 5, an outer tube 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 provided at the bottom of the outer tube 6; the inner tube 5 is provided inside the outer tube 6; the first water inlet pipe 3 and the dosing pipe 4 are provided on the side wall of the outer tube 6 and communicate with the interior of the inner tube 5; the tube opening of the inner tube 5 faces the top of the outer tube 6; the inclined tube enhanced separation device 8 is provided at the top of the outer tube 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 provided at the bottom of the outer tube 6. The dosing pipe 4 is preferably an annular dosing pipe with a plurality of dosing ports evenly arranged on the annular dosing pipe. The water collection tank 9 is an annular water collection tank. The outer cylinder 6 comprises a bottom cylinder 6-1, a middle cylinder 6-2, and a top cylinder 6-3. The diameter of the top cylinder 6-3 is larger than that of the middle cylinder 6-2; the diameter of the middle cylinder 6-2 is larger than that of the bottom cylinder 6-1. The bottom cylinder 6-1 is connected to the middle cylinder 6-2 via a first variable diameter rib 10-1; the middle cylinder 6-2 is connected to the top cylinder 6-3 via a second variable diameter rib 10-2. The outer cylinder 6 has an overall spiral structure to facilitate solid-liquid separation.

[0030] The backwash-free multi-stage filter bed, each stage of the crystallization filter bed includes: a water distributor 11, a cleaning device 12, a filter layer 13, a water collection tank 14 and a sludge tank 15; the filter layer 13 is arranged at an angle, the starting end of the filter layer 13 is higher than the tail end, the water distributor 11 is connected to the starting end of the filter layer 13, the cleaning device 12 is arranged above the filter layer 13, the water collection tank 14 is arranged below the filter layer 13, and the sludge tank 15 is arranged at the tail end of the filter layer 13; wherein, the water distributor 11 of the first-stage crystallization filter bed is connected to the outlet pipe 7, and in the remaining multi-stage crystallization filter beds, the water collection tank 14 of the upper-stage crystallization filter bed is connected to the water distributor 11 of the next-stage crystallization filter bed through a lifting pump 17. Example

[0031] The filter layer 13 is set at an angle of 15° to 45° relative to the horizontal plane, and the inclination angle of the filter layer 13 relative to the horizontal plane can be flexibly set according to actual processing requirements;

[0032] Specifically, the water distributor 11 adopts a sawtooth structure to achieve uniform water distribution and obtain good treatment effect;

[0033] The cleaning device 12 is arranged parallel to the filter layer 13. Guide rails are provided on both sides of the cleaning device 12. A moving part containing a high-pressure nozzle is provided on the guide rail. The moving part drives the high-pressure water nozzle to spray toward the filter layer 13 for cleaning.

[0034] Specifically, the high-pressure water in the cleaning device 12 is taken from the water collection tank 14 to achieve water recycling. The number of high-pressure water nozzles on the moving parts can be adjusted according to specific circumstances.

[0035] As a preferred embodiment of the present invention, the filter layer 13 can adopt a hydraulic grid or a stainless steel flat membrane, etc., to perform solid-liquid separation on large suspended solids and small suspended solids in the water, respectively. The specific selection can be made according to the quality of the influent water to be treated. For example, when the filter layer 13 is a hydraulic grid, it is suitable for water with an SS value (suspended solids content) of less than 1000 mg / L. When the filter layer is a stainless steel flat membrane, it is suitable for water with an SS value (suspended solids content) of less than 150 mg / L.

[0036] The backwash-free multi-stage filter bed system can be operated in series using filter layers 13 of different pore sizes according to actual application requirements. The filter beds at each stage are connected by a lifting pump 17, and the sludge in the multi-stage filter bed sludge tank 15 is collected in a sludge collection tank 16 for unified disposal.

[0037] The operating method of the crystal film fluidized bed treatment system for high hardness wastewater treatment in the above embodiment is as follows:

[0038] The crystallization fluidized bed is mainly used for the treatment of large amounts of Ca 2+ and a small amount of Mg 2+ The backwash-free multi-stage filter bed system is mainly used for the removal of Mg in the effluent of the crystallization fluidized bed. 2+ and the remaining Ca 2+ removal.

[0039] The influent of the crystallization fluidized bed is high calcium and high magnesium water. NaOH is used as a softening agent in the crystallization fluidized bed, and garnet particles with a certain particle size range are used as induction crystal seeds. The raw water enters the device through the crystallization fluidized bed inlet pipe 3 and is fully mixed with the pre-dosed induction crystal seeds under the action of hydraulic stirring. The NaOH solution enters the inner cylinder 5 through the annular dosing pipe 4 to form alkaline conditions to promote the Ca 2+ With CO3 2- The reaction generates CaCO3 crystals, Mg 2+ With OH -Mg(OH)2 is formed; the mixed solution in the inner cylinder 5 enters the outer cylinder 6 in an upflow manner, and the formed CaCO3 adheres to the surface of the induction crystal seed and undergoes solid-liquid separation in the outer cylinder 6. The crystallized particles are refluxed from the bottom of the inner cylinder 5 for cyclic crystallization. The CaCO3 crystals that are not effectively attached to the surface of the induction crystal seed and Mg(OH)2 are separated into solid and liquid when passing through the inclined tube enhanced separation device 8. The softened effluent is collected by the annular water collecting tank 9 and then discharged from the fluidized bed through the outlet pipe 7. With the continuous and stable operation of the fluidized bed, crystals are continuously attached to the surface of the induction crystal seed to achieve the growth of particle size. Particles with larger particle size are continuously accumulated at the bottom of the outer cylinder 6 and finally discharged through the slag discharge pipe 2;

[0040] The effluent from the crystallization fluidized bed flows into the filter layer 13 through the water distributor 11. The water filtered by the filter layer 13 falls into the water collection tank 14. If there is silt, it will be blocked on the surface of the filter screen 13. The silt flows into the silt pool 15 under the action of gravity and the flushing of the cleaning device 12. The silt pools 15 of the multi-stage filter beds flow into the sludge collection tank together for unified treatment; the filtered water in the water collection tank 14 enters the next stage filter bed through the lifting pump 17 for filtration until the water quality meets the requirements.

[0041] The utility model has a clear overall system structure, compact connections between various functional units, and convenient operation. It can effectively remove hardness ions in high-calcium and high-magnesium water, and can also effectively remove suspended matter in the water.

[0042] From the above content, it can be seen that the water treatment system of the present invention improves the shortcomings of the existing technology of single equipment in removing turbidity and Mg2+ compounds, and at the same time effectively removes turbidity through a pure physical method without additional addition of flocculants and coagulants, while avoiding the impact of the agents on the subsequent membrane treatment system.

[0043] It should be noted that, in this document, relational terms such as first and second are used only 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 terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. At the same time, in the description of the present invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inside," "outside," "clockwise," "counterclockwise," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are intended only to facilitate the description of the present invention and simplify the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting the present invention. In the drawings of the present invention, the filling patterns are only used to distinguish the layers and do not constitute any other limitation.

[0044] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A backwash-free crystallization and granulation filter bed combination system for high calcium and high magnesium water treatment, characterized in that: include: Support device (1), slag discharge pipe (2), water inlet pipe (3), dosing pipe (4), inner tube (5), outer tube (6), water outlet pipe (7), inclined tube enhanced separation device (8) and water collecting tank (9); The supporting device (1) is arranged at the bottom of the outer cylinder (6); The inner cylinder (5) is arranged inside the outer cylinder (6); The water inlet pipe (3) and the drug dosing pipe (4) are arranged on the side wall of the outer cylinder (6) and are connected to the interior of the inner cylinder (5); The opening of the inner cylinder (5) faces the top of the outer cylinder (6); The inclined tube enhanced separation device (8) is arranged on the top of the outer cylinder (6), the water collecting tank (9) is connected to the inclined tube enhanced separation device (8), and the 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); It also includes a multi-stage crystallization filter bed, each stage of the crystallization filter bed includes: a water distributor (11), a cleaning device (12), a filter layer (13), a water collection tank (14) and a sludge tank (15); the filter layer (13) is arranged in an inclined manner, the starting end of the filter layer (13) is higher than the tail end, the water distributor (11) is connected to the starting end of the filter layer (13), the cleaning device (12) is arranged above the filter layer (13), the water collection tank (14) is arranged below the filter layer (13), and the sludge tank (15) is arranged at the tail end of the filter layer (13); The water distributor (11) of the first-stage crystallization filter bed is connected to the water outlet pipe (7), and in the remaining multi-stage crystallization filter beds, the water collection tank (14) of the upper-stage crystallization filter bed is connected to the water distributor (11) of the lower-stage crystallization filter bed via a lifting pump (17).

2. The backwash-free crystallization and granulation filter bed combination system for high calcium and high magnesium water treatment according to claim 1 is characterized in that: The inclined tube enhanced separation device (8) adopts an inclined tube or inclined plate sedimentation device.

3. The backwash-free crystallization and granulation filter bed combination system for high calcium and high magnesium water treatment according to claim 1 is characterized in that: The dosing pipe (4) is an annular dosing pipe, and a plurality of dosing ports are evenly arranged on the annular dosing pipe.

4. The backwash-free crystallization and granulation filter bed combination system for high calcium and high magnesium water treatment according to claim 1 is characterized in that: The water collecting trough (9) is an annular water collecting trough.

5. The backwash-free crystallization and granulation filter bed combination system for high calcium and high magnesium water treatment according to claim 1 is characterized in that: The outer cylinder (6) comprises a bottom cylinder (6-1), a middle cylinder (6-2) and a top cylinder (6-3); The diameter of the top cylinder (6-3) is larger than that of the middle cylinder (6-2); The diameter of the middle cylinder (6-2) is larger than that of the bottom cylinder (6-1); the bottom cylinder (6-1) is connected to the middle cylinder (6-2) via a first variable diameter rib (10-1); and the middle cylinder (6-2) is connected to the top cylinder (6-3) via a second variable diameter rib (10-2).

6. The backwash-free crystallization and granulation filter bed combination system for high calcium and high magnesium water treatment according to claim 1 is characterized in that: It also includes a sludge collecting pool (16), and the sludge pool (15) of the multi-stage crystallization filter bed is connected to the sludge collecting pool (16).

7. The backwash-free crystallization and granulation filter bed combination system for high calcium and high magnesium water treatment according to claim 1 is characterized in that: The cleaning device (12) is provided with guide rails along both sides of the filter layer (13), and a moving component containing a high-pressure nozzle is provided on the guide rail. The moving component drives the high-pressure water nozzle to spray toward the filter layer (13) for cleaning.

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