Crystallization and granulation fluidized bed for water treatment

Abstract

The invention relates to the field of sewage treatment, in particular to a crystallization granulation fluidized bed for water treatment, which comprises a fluidized bed body, a sludge pump, a pipeline mixer, a gallipot I and a gallipot II, the bottom of the fluidized bed body is provided with a sludge discharge port, one side of the top end of the fluidized bed body is provided with a water outlet, and one side of the bottom end of the fluidized bed body is provided with a water inlet; the first medicine tank is connected with the pipeline mixer through a first medicine conveying pipe provided with a second flow adjusting valve, and the second medicine tank is connected with the pipeline mixer through a second medicine conveying pipe provided with a third flow adjusting valve. According to the invention, a plurality of water treatment functional units are integrated in compact equipment, so that the occupied area is obviously reduced, and the miniaturization of the equipment is realized.

Description

Technical Field

[0001] The invention relates to the field of sewage treatment, in particular to a crystallization granulation fluidized bed for water treatment. Background Art

[0002] In the water treatment process, the removal of colloidal and suspended pollutants can be achieved through solid-liquid separation operations. Some dissolved pollutants can also be effectively removed during the separation process. Therefore, good solid-liquid separation effect is one of the main goals of water treatment.

[0003] In the traditional solid-liquid separation technology, a Chinese utility model patent with publication number CN211863966U proposes a pulse clarifier, which includes: a water inlet; a pulse generating device for generating a pulse water flow, wherein the water to be treated enters the pulse generating device through the water inlet; a clarifier, including a water distribution system located at the bottom of the clarifier, a water outlet system located at the top of the clarifier, and a sludge suspension layer between the water distribution system and the water outlet system, wherein the pulse water flow generated by the pulse generating device enters the clarifier through the water distribution system, passes through the sludge suspension layer, and leaves the clarifier through the water outlet system; wherein the pulse clarifier also includes a plurality of inclined plates, wherein the plurality of inclined plates are at least partially arranged in the sludge suspension layer, and a plurality of inclined channels are defined between the inclined plates, wherein the water flow entering the clarifier through the water distribution system at least partially travels upward through the inclined channels.

[0004] The above-mentioned clarification tank has a large sludge suspension layer and many ancillary equipment, making it difficult to achieve integration and miniaturization. Summary of the invention

[0005] The object of the present invention is to provide a crystallization granulation fluidized bed for water treatment, aiming to realize the integration and miniaturization of water treatment equipment, so as to improve the water treatment efficiency and sludge treatment capacity.

[0006] In order to solve the above technical problems, the present invention provides a crystallization granulation fluidized bed for water treatment, comprising: A fluidized bed body, wherein a mud discharge port is provided at the bottom of the fluidized bed body, a water outlet is provided at one side of the top end thereof, and a water inlet is provided at one side of the bottom end thereof, a liquid level gauge is provided at the inner top end of the fluidized bed body, and a second potentiometer is provided at the inner bottom end thereof; A sludge pump, wherein the input end of the sludge pump is connected to the sludge discharge port via a sludge discharge pipe provided with a second concentration meter; A pipeline mixer, wherein the output end of the pipeline mixer is connected to the water inlet through a water inlet pipe connected to a water pump 2, and the input end of the pipeline mixer is connected to a raw water pipe, on which a potentiometer 1 and a concentration meter 1 are provided; A medicine tank 1, wherein an inorganic salt coagulant is contained in the medicine tank 1, and the medicine tank 1 is connected to a pipeline mixer via a medicine delivery pipe 1 provided with a flow regulating valve 2; Medicine tank 2, wherein organic polymer coagulant aid is contained in the medicine tank 2, and the medicine tank 2 is connected to the pipeline mixer through medicine delivery pipe 2 provided with flow regulating valve 3.

[0007] Preferably, the pipeline mixer includes a vertical tube, a stirrer 2 is arranged inside the vertical tube, a driving motor 2 connected to the stirrer 2 is arranged on the top of the vertical tube, a drug inlet 1 and a drug inlet 2 are opened on one side of the vertical tube, an outlet is opened on one side of the top end of the vertical tube, and an inlet is opened at the bottom of the vertical tube.

[0008] Preferably, one end of the first medicine inlet and one end of the second medicine inlet are both provided with a curved pipe pointing to the stirring paddle in the second stirrer.

[0009] Preferably, the fluidized bed body includes an outer cylinder and an inner cylinder, the inner cylinder is installed at the center of the outer cylinder through a support frame, the mud discharge port is arranged at the bottom of the outer cylinder, a separation component is installed inside the outer cylinder, the separation component is located above the inner cylinder, an agitator is installed in the middle of the inner cylinder, and the upper end of the agitator passes through the separation component and is fixedly connected to a drive motor fixed on the top of the outer cylinder.

[0010] Preferably, a circle of overflow weir is provided inside the outer cylinder, the overflow weir is located above the separation component, a clear water area is formed between the overflow weir and the inner wall of the outer cylinder, and the water outlet is connected to the clear water area.

[0011] Preferably, a diverter pipe is provided at the bottom of the inner cylinder, a normally closed drain port is provided on one side of the diverter pipe, the water inlet is provided on the outer wall of the outer cylinder and connected to the diverter pipe, a scraper is provided inside the outer cylinder, and the lower end of the agitator passes through the diverter pipe and is connected to the rotating shaft of the scraper.

[0012] Preferably, the lower end of the agitator 1 is connected to the rotating shaft of the scraper through an electromagnetic clutch.

[0013] Preferably, the water outlet is connected to a water pump via a drain pipe.

[0014] After adopting the above technical solution, the beneficial effects of the present invention are: The present invention integrates multiple water treatment functional units into a compact device, significantly reducing the floor space and realizing the miniaturization of the device. The level meter and potentiometer set in the fluidized bed body can monitor the water level and sludge concentration in real time, providing data support for the intelligent control of the device. The concentration meters on the sludge pump and pipeline mixer can monitor the concentration of sludge and influent respectively, which is convenient for adjusting the dosage of the reagent and ensuring the stability of the effluent water quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a structural schematic diagram of the fluidized bed body; Figure 3 This is a schematic diagram of the structure of a pipeline mixer.

[0017] Figure numerals: 1-water pump 1, 2-drain pipe, 3-fluidized bed body, 4-flow regulating valve 1, 5-flow regulating valve 2, 6-medicine tank 1, 7-medicine tank 2, 8-flow regulating valve 3, 9-drug delivery pipe 1, 10-drug delivery pipe 2, 11-potentiometer 1, 12-concentration meter 1, 13-raw water pipe, 14-pipeline mixer, 15-water pump 2, 16-water inlet pipe, 17-sludge pump, 18-flow regulating valve 4, 19-sludge discharge pipe, 20-concentration meter 2, 21-liquid level 1-meter, 22-overflow weir, 23-separation component, 24-agitator 1, 25-outer cylinder, 26-diverter, 27-water inlet, 28-electromagnetic clutch, 29-mud outlet, 30-scraper, 31-drainage outlet, 32-potentiometer 2, 33-inner cylinder, 34-water outlet, 35-driving motor 1, 36-vertical pipe, 37-medicine inlet 1, 38-medicine inlet 2, 39-agitator 2, 40-driving motor 2, 41-export, 42-elbow, 43-inlet. DETAILED DESCRIPTION

[0018] The features and exemplary embodiments of various aspects of the present invention will be described in detail below. In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only configured to explain the present invention and are not configured to limit the present invention. For those skilled in the art, the present invention can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present invention by illustrating examples of the present invention.

[0019] The directional words appearing in the following description are all directions shown in the figures, and do not limit the specific structure of the present invention. In the description of the present invention, it should also be noted that, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0020] like Figure 1-3 As shown, an embodiment of the present invention provides a crystallization granulation fluidized bed for water treatment, including a fluidized bed body 3, a medicine tank 1 6, a medicine tank 2 7, a pipeline mixer 14 and a sludge pump 17.

[0021] The fluidized bed body 3 is mainly composed of a separation assembly 23, an outer cylinder 25 and an inner cylinder 33. A mud discharge port 29 is provided at the bottom of the outer cylinder 25. The mud discharge port 29 is connected to the sludge pump 17 through a mud discharge pipe 19. The mud discharge pipe 19 is provided with a concentration meter 20 and a flow control valve 5 (not shown in the figure). The inner cylinder 33 is installed at the center of the outer cylinder 25 through multiple groups of vertically arranged support frames. The separation assembly 23 (composed of a number of corrugated pipes, the structure is the prior art, and will not be described here) is installed inside the outer cylinder 25 and is located above the inner cylinder 33. A circle of overflow weirs 22 is provided inside the outer cylinder 25. The overflow weir 22 is located above the separation assembly 23. A clear water area is formed between the overflow weir 22 and the inner wall of the outer cylinder 25. A water outlet 34 connected to the clear water area is provided on one side of the top of the outer cylinder 25. The water outlet 34 is connected to the water pump 1 through the drain pipe 2, and a flow regulating valve 4 for accurately controlling the water output is provided on the drain pipe 2. A liquid level gauge 21 for detecting the top liquid level is provided at the inner top of the outer cylinder 25, and a potentiometer 2 32 for monitoring the current water body Zeta potential is provided inside the inner cylinder 33.

[0022] A shunt pipe 26 is provided at the bottom of the inner cylinder 33, and a water inlet 27 connected to the shunt pipe 26 is provided at one side of the bottom end of the outer cylinder 25. A drain port 31 is provided at one side of the shunt pipe 26, and a normally closed stop valve is provided on the drain port 31. The drain port 31 is opened only when the inner cylinder 33 is cleaned so as to discharge the cleaned water out of the inner cylinder 33. An agitator 24 is installed in the middle of the inner cylinder 33, and a scraper 30 is provided inside the outer cylinder 25. The upper end of the agitator 24 passes through the separation assembly 23 and is fixedly connected to the drive motor 35 fixed at the top center of the outer cylinder 25, and the lower end of the agitator 24 passes through the shunt pipe 26 and is connected to the rotating shaft of the scraper 30 through the electromagnetic clutch 28.

[0023] The pipeline mixer 14 is a vertical tubular structure, including a vertical pipe 36, an agitator 39 and a drive motor 40. The agitator 39 is located inside the vertical pipe 36, and mixes the water in the vertical pipe 36 by rotating. The drive motor 40 is located at the top of the vertical pipe 36, connected to the agitator 39, and provides power for the agitator 39 so that it can rotate and stir. A medicine inlet 1 37 and a medicine inlet 2 38 are provided on one side of the vertical pipe 36, and one end of the medicine inlet 1 37 and the medicine inlet 2 38 are provided with a curved pipe 42 pointing to the stirring paddle in the agitator 2 39, so as to directly guide the added material to the stirring area to improve the mixing efficiency. An outlet 41 is provided on one side of the top of the vertical pipe 36, and an inlet 43 is provided at the bottom of the vertical pipe 36.

[0024] The inlet 43 of the pipeline mixer 14 is connected to the raw water pipe 13, and the raw water pipe 13 is provided with a potentiometer 11 and a concentration meter 12. The potentiometer 11 is used to monitor the initial Zeta potential of the water body, and the concentration meter 12 is used to monitor the initial concentration of the water body. The outlet 41 of the pipeline mixer 14 is connected to the input end of the water pump 2 15 through a pipeline, and the output end of the water pump 2 15 is connected to the water inlet 27 through the water inlet pipe 16. The water inlet pipe 16 is provided with a flow regulating valve 4 18 to accurately control the amount of sewage added.

[0025] The medicine tank 16 is filled with inorganic salt coagulants, such as aluminum sulfate, alum, polyaluminum chloride, ferric chloride and ferrous sulfate, etc. The medicine tank 16 is connected to the medicine inlet 37 of the pipeline mixer 14 through the medicine delivery tube 19. The medicine delivery tube 19 is provided with a flow regulating valve 25 to accurately control the dosage of the inorganic salt coagulant. The medicine tank 27 is filled with organic polymer coagulants, such as polyacrylamide, polyethylene oxide, chitosan, etc. The medicine tank 27 is connected to the medicine inlet 38 of the pipeline mixer 14 through the medicine delivery tube 210. The medicine delivery tube 210 is provided with a flow regulating valve 38 to accurately control the dosage of the organic polymer coagulant.

[0026] The raw water pipe 13 introduces the untreated raw water into the pipeline mixer 14, and the raw water is pre-mixed with the inorganic salt coagulant pumped by the medicine tank 16 or the organic polymer coagulant pumped by the medicine tank 27 in the vertical pipe 36 (there is a dosing order, the inorganic salt coagulant is added first, and the organic polymer coagulant is added later) to obtain pre-mixed water. During the transportation of raw water, the potentiometer 11 and the concentration meter 12 monitor the Zeta potential and particle concentration of the raw water in real time, and transmit them to the control system. The control system pre-calculates the required amount of inorganic salt coagulant and organic polymer coagulant based on the results, and then controls the addition amount by controlling the opening of the flow control valve 25 and the flow control valve 38.

[0027] Zeta potential is a measure of the strength of mutual repulsion or attraction between particles and is an important indicator for characterizing the stability of colloidal dispersions. The higher the absolute value of the Zeta potential, the more stable the system is and the more it tends to resist aggregation. Conversely, it tends to coagulate. Inorganic salt coagulants affect the magnitude and sign of the Zeta potential by changing the surface charge and charge distribution of the colloidal particles. Based on the changing trend of the Zeta potential, the optimal addition range of the inorganic salt coagulant can be determined, thereby achieving precise control of the stability of the colloidal dispersion.

[0028] When the particle concentration (SS) of sewage is very high, a shielding layer may form on the particle surface, reducing the charge density on the particle surface and further reducing the charge neutralization effect when adding inorganic salt coagulants. At this time, even if the appropriate amount of inorganic salt coagulant is given according to the Zeta potential, the coagulation effect will gradually weaken if the amount of inorganic salt coagulant is further increased due to SS. Therefore, the amount of inorganic salt coagulant added should be comprehensively judged based on Zeta potential and SS.

[0029] Organic polymer coagulants can increase the bonding strength between particles, that is, improve the ability of agglomerated floccules to resist external shear during the granulation process. According to the amount of inorganic salt coagulant added, Zeta potential and SS, the amount of organic polymer coagulant can be reasonably controlled to ensure the bonding strength required for flocculation.

[0030] In the granulation stage, the premixed water in the inner cylinder 33 is continuously stirred by the agitator 24, and the small particles in the water rise with the water flow and gradually flocculate and grow. Due to the obstruction of the separation component 23, the large particles fall to the bottom of the outer cylinder 25 under the action of gravity. The remaining small particles gushing out from the inner cylinder 33 gradually grow by contact flocculation in the process of passing through the separation component 23. The grown particles automatically fall to the bottom of the outer cylinder 25 under the action of gravity. The supernatant treated by the separation component 23 will flow into the clear water area formed between the overflow weir 22 and the inner wall of the outer cylinder 25, and finally discharged through the water outlet 34. In the granulation stage, the potentiometer 2 32 monitors the Zeta potential change trend in the inner cylinder 33 in real time, so as to adjust the dosage of the inorganic salt coagulant and the organic polymer coagulant aid in time.

[0031] When the outlet 34 starts to discharge clean water, 5 to 10 minutes later, the mud outlet 29 opens, the sludge pump 17 starts, and the sludge is extracted at a certain flow rate, forming a dynamic balance with the clean water discharged from the outlet 34 and the premixed water entering the water inlet 27. In order to ensure that the treated water can be discharged continuously and stably, the opening of the flow control valve 14 is at a constant opening according to the preset value. When the concentration meter 20 detects that the concentration reaches the preset value, the opening of the flow control valve 5 increases to speed up the extraction speed and avoid the accumulation of sludge. However, the increase in the opening of the flow control valve 5 will affect the dynamic balance.

[0032] When the liquid level in the fluidized bed body 3 rises to the height of the overflow weir 22, the liquid will evenly overflow from the weir surface. Therefore, the liquid level has an important influence on the treatment result. The calculation formula of the liquid level is:

[0033] in: is the real-time liquid level in the fluidized bed body 3, in m; is the initial liquid level in the fluidized bed body 3, in m; is the bottom area of ​​the outer cylinder 25, in m 2 ; is the processing cycle, in seconds; is the proportionality coefficient, which is related to the shape of the fluidized bed body 3 and the pipe diameter. The value of is 0.85; is the water inlet velocity, in m 3 / s, which is regulated by the flow regulating valve 418; is the water outlet velocity, in m 3 / s, which is regulated by flow control valve 4; is the sewage flow rate, in m 3 / s, which is regulated by flow control valve five.

[0034] According to the formula, According to the preset value, it is in a constant state. It changes according to the value of the concentration meter 20. Therefore, in order to ensure To maintain the preset range, the control system needs to control the flow control valve 418 to adjust to ensure the balance of the system and to ensure that the liquid level remains constant.

[0035] When the concentration meter 20 detects that the concentration reaches the preset value, the flow control valve 5 increases its opening, and the electromagnetic clutch 28, which is normally in an interrupted state, links the agitator 24 and the scraper 30 to speed up the discharge process until the monitoring result of the concentration meter 20 is lower than the preset value.

[0036] According to the embodiments of the present invention as described above, these embodiments do not describe all the details in detail, nor do they limit the invention to specific embodiments. Obviously, many modifications and changes can be made based on the above description. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can make good use of the present invention and the modified use based on the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A crystallization granulation fluidized bed for water treatment, characterized in that: include: A fluidized bed body (3), wherein a mud discharge port (29) is provided at the bottom of the fluidized bed body (3), a water outlet (34) is provided at one side of the top end thereof, and a water inlet (27) is provided at one side of the bottom end thereof, a liquid level meter (21) is provided at the inner top end of the fluidized bed body (3), and a second potentiometer (32) is provided at the inner bottom end thereof; A sludge pump (17), wherein the input end of the sludge pump (17) is connected to a sludge discharge port (29) via a sludge discharge pipe (19) provided with a second concentration meter (20); A pipeline mixer (14), wherein the output end of the pipeline mixer (14) is connected to the water inlet (27) via a water inlet pipe (16) connected to a second water pump (15), and the input end of the pipeline mixer (14) is connected to a raw water pipe (13), and a potentiometer 1 (11) and a concentration meter 1 (12) are provided on the raw water pipe (13); Medicine tank one (6), wherein the interior of the medicine tank one (6) is filled with an inorganic salt coagulant, and the medicine tank one (6) is connected to a pipeline mixer (14) via a medicine delivery pipe one (9) provided with a flow regulating valve two (5); Medicine tank 2 (7), wherein the interior of the medicine tank 2 (7) is filled with an organic polymer coagulant, and the medicine tank 2 (7) is connected to a pipeline mixer (14) via a medicine delivery pipe 2 (10) provided with a flow regulating valve 3 (8).

2. The crystallization granulation fluidized bed for water treatment according to claim 1, characterized in that: The pipeline mixer (14) comprises a vertical pipe (36), a second stirrer (39) is arranged inside the vertical pipe (36), a second drive motor (40) connected to the second stirrer (39) is arranged at the top of the vertical pipe (36), a first drug inlet (37) and a second drug inlet (38) are provided on one side of the vertical pipe (36), an outlet (41) is provided on one side of the top end of the vertical pipe (36), and an inlet (43) is provided at the bottom of the vertical pipe (36).

3. The crystallization granulation fluidized bed for water treatment according to claim 2, characterized in that: One end of each of the first medicine inlet (37) and the second medicine inlet (38) is provided with a curved pipe (42) pointing to the stirring paddle in the second stirrer (39).

4. The crystallization granulation fluidized bed for water treatment according to claim 1, characterized in that: The fluidized bed body (3) comprises an outer cylinder (25) and an inner cylinder (33), the inner cylinder (33) being mounted at the center of the outer cylinder (25) via a support frame, the mud discharge port (29) being arranged at the bottom of the outer cylinder (25), a separation assembly (23) being mounted inside the outer cylinder (25), the separation assembly (23) being located above the inner cylinder (33), an agitator (24) being mounted in the middle of the inner cylinder (33), the upper end of the agitator (24) passing through the separation assembly (23) and being fixedly connected to a drive motor (35) fixed to the top of the outer cylinder (25).

5. The crystallization granulation fluidized bed for water treatment according to claim 4, characterized in that: A circle of overflow weirs (22) is arranged inside the outer cylinder (25), and the overflow weir (22) is located above the separation assembly (23). A clear water area is formed between the overflow weir (22) and the inner wall of the outer cylinder (25), and the water outlet (34) is connected to the clear water area.

6. The crystallization granulation fluidized bed for water treatment according to claim 5, characterized in that: A diverter pipe (26) is provided at the bottom of the inner cylinder (33), a normally closed drain port (31) is provided on one side of the diverter pipe (26), the water inlet (27) is provided on the outer wall of the outer cylinder (25) and is connected to the diverter pipe (26), a scraper (30) is provided inside the outer cylinder (25), and the lower end of the agitator (24) passes through the diverter pipe (26) and is connected to the rotating shaft of the scraper (30).

7. The crystallization granulation fluidized bed for water treatment according to claim 6, characterized in that: The lower end of the stirrer (24) is connected to the rotating shaft of the scraper (30) via an electromagnetic clutch (28).

8. The crystallization granulation fluidized bed for water treatment according to claim 1, characterized in that: The water outlet (34) is connected to a water pump (1) via a drainage pipe (2).

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