A system and method for treating alkaline wastewater

Abstract

The application discloses an alkaline wastewater treatment system and method, and belongs to the field of wastewater treatment. The alkaline wastewater treatment method comprises the following steps: sending clean water and normal-temperature carbon dioxide into a carbon dioxide injector to mix, forming carbonated water, then sending the carbonated water and alkaline wastewater into a reactor to react, the reaction pressure is 0.4-0.6 Mpa, and carbon dioxide with a temperature of 5-10 DEG C is sent into the reactor, the water outlet of the reactor is sent into a pressure reducer to reduce the pressure, the carbon dioxide in the water is released, and the water is backflowed into the carbon dioxide injector, the filtered water after pressure reduction is collected into a water collecting tank, then the clean water is obtained after filtration through a filter, and the clean water is reused to the carbon dioxide injector. The alkaline wastewater treatment system and method can make the carbon dioxide well neutralize and treat the alkaline substances in the alkaline wastewater through pressurization and pressure reduction, has high treatment efficiency and good treatment effect, and realizes the recycling of carbon dioxide and water.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of wastewater treatment, and particularly relates to an alkaline wastewater treatment system and method. BACKGROUND

[0002] Alkaline wastewater treatment, especially cement wastewater treatment, is an important environmental problem. This kind of wastewater usually contains high concentrations of alkaline substances such as sodium hydroxide, calcium hydroxide, etc., as well as suspended solids, heavy metals and other pollutants. The main purpose of treating this kind of wastewater is to reduce its pH value, remove suspended solids and heavy metals, so that it meets the discharge standard.

[0003] Acid-base neutralization method is one of the most commonly used treatment methods. By adding acidic substances (such as sulfuric acid, hydrochloric acid, etc.) to the wastewater, the pH value of the wastewater is reduced to an appropriate range. The amount of acidic substances added should be determined according to the composition and pH value of the wastewater to ensure that the neutralized wastewater meets the discharge standard.

[0004] Existing technologies use carbon dioxide to treat alkaline wastewater, but carbon dioxide is difficult to dissolve in water, and the reaction efficiency and effect are not good, and carbon dioxide cannot be recycled and used, causing resource waste. SUMMARY

[0005] The purpose of the present application is to provide an alkaline wastewater treatment system and method to overcome at least one of the above-mentioned defects in the prior art.

[0006] To achieve this purpose, the present application adopts the following technical solutions:

[0007] The alkaline wastewater treatment method provided by the present application comprises the following steps: sending clean water and carbon dioxide at room temperature into a carbon dioxide injector for mixing to form carbonated water, then sending the carbonated water and alkaline wastewater into a reactor for reaction, the reaction pressure is 0.4-0.6 Mpa, at the same time, carbon dioxide at a temperature of 5-10℃ is sent into the reactor, the water outlet of the reactor enters a pressure reducer for pressure reduction treatment, so that the carbon dioxide in the water is released and flows back to the carbon dioxide injector, the filtered water after pressure reduction enters a water collecting tank for collection, then passes through a filter to obtain clean water, and the clean water is reused to the carbon dioxide injector.

[0008] The application further provides a basic wastewater treatment system for implementing the basic wastewater treatment method, comprising a carbon dioxide storage tank, a carbon dioxide injector, a reactor, a pressure release device, a water collecting tank, a filter, a first pump and a second pump, the carbon dioxide storage tank has two outlets, one of which is communicated with the gas inlet of the carbon dioxide injector through a first pipeline, and the other is communicated with the reactor through a second pipeline, the outlet of the filter is communicated with the liquid inlet of the carbon dioxide injector through a third pipeline, the third pipeline is provided with the first pump, the outlet of the carbon dioxide injector is communicated with the reactor through a fourth pipeline, the basic wastewater enters the reactor through a fifth pipeline, the outlet of the reactor is communicated with the pressure release device through a sixth pipeline, the outlet of the pressure release device is communicated with the water collecting tank through a seventh pipeline, the water collecting tank is communicated with the filter through an eighth pipeline, the exhaust port of the pressure release device is communicated with the first pipeline through a ninth pipeline, and the ninth pipeline is provided with the second pump.

[0009] Preferably, the reactor comprises a reaction tank, a first liquid distribution assembly, a second liquid distribution assembly, a filler layer, a stirring assembly, a motor and a transmission assembly, the filler layer is arranged at the upper portion of the inside of the reaction tank, the first liquid distribution assembly is fixed to the inside of the reaction tank above the filler layer, the fourth pipeline is communicated with the first liquid distribution assembly, the second liquid distribution assembly is arranged at the top of the reaction tank, the liquid distribution end of the second liquid distribution assembly extends to the inside of the reaction tank and is surrounded by the first liquid distribution assembly, the fifth pipeline extends to the second liquid distribution assembly, the stirring assembly is arranged at the bottom of the reaction tank, the stirring end of the stirring assembly is located at the lower portion of the inside of the reaction tank and below the filler layer, the second pipeline extends to the stirring assembly, the motor is fixed to the top of the reaction tank, and the motor is in transmission connection with the second liquid distribution assembly and the stirring assembly through the transmission assembly.

[0010] Preferably, the second pipeline is provided with a cooling jacket.

[0011] Preferably, the first liquid distribution assembly comprises a liquid distribution ring, a first liquid cavity and a first liquid distribution hole, the liquid distribution ring is fixed to the upper portion of the inside of the reaction tank, the first liquid cavity is arranged in the inside of the liquid distribution ring, and a plurality of first liquid distribution holes are arranged on the inner side wall of the first liquid cavity in a circumferential direction.

[0012] Preferably, the second liquid distribution assembly comprises a first bearing seat, a first hollow rotating shaft, a first sealing element, a liquid distribution disc, a second liquid cavity and a second liquid distribution hole, the first bearing seat is fixed to the top wall of the reaction tank, the bottom end of the first hollow rotating shaft penetrates through the first bearing seat and the top wall of the reaction tank and extends to the liquid distribution ring to be fixedly connected with the liquid distribution disc, the first hollow rotating shaft is sealingly arranged between the top wall of the reaction tank, the second liquid cavity is arranged in the liquid distribution disc, a plurality of second liquid distribution holes are arranged on the outer side wall of the second liquid cavity in a circumferential direction, the first liquid distribution hole is oppositely arranged with the second liquid distribution hole, the fifth pipeline extends to the inside of the first hollow rotating shaft, and the first sealing element is arranged between the fifth pipeline and the first hollow rotating shaft.

[0013] Preferably, the first liquid distribution hole and the second liquid distribution hole are both arranged upwardly inclined.

[0014] Preferably, the stirring assembly comprises a second bearing seat, a second hollow rotating shaft, transverse hollow stirring rods, a second sealing member, and vertical hollow stirring rods, the bottom wall of the reaction tank is fixed with the second bearing seat, the second hollow rotating shaft penetrates through the second bearing seat and the bottom wall of the reaction tank and extends to below the inside of the reaction tank, a plurality of transverse hollow stirring rods are fixedly communicated below the second hollow rotating shaft, the second hollow rotating shaft is sealingly arranged between the bottom wall of the reaction tank, the outer ends of the transverse hollow stirring rods are fixedly communicated with vertical hollow stirring rods, the second pipeline extends into the second hollow rotating shaft, the second hollow rotating shaft is provided with the second sealing member between the second hollow rotating shaft and the second pipeline, the upper and lower side walls of the transverse hollow stirring rods are both provided with a plurality of vertical air holes, and the outer side wall of the vertical hollow stirring rod is provided with a plurality of transverse air holes.

[0015] Preferably, the stirring assembly further comprises a guide rod, a spring, and a scraper, the outer side wall of the vertical hollow stirring rod is fixed with the guide rod, the scraper is sleeved on the guide rod, the inner side wall of the scraper is fixed with the spring, and the inner end of the spring is fixedly connected with the outer side wall of the vertical hollow stirring rod.

[0016] Preferably, the transmission assembly comprises a third rotating shaft, a third bearing seat, a first driving wheel, a first driven wheel, a first transmission belt, a second driving wheel, a second driven wheel, and a second transmission belt, the right side wall of the reaction tank is fixed with the third bearing seat, the bottom end of the motor is fixed with the third rotating shaft, the third rotating shaft penetrates through the third bearing seat, the upper portion of the third rotating shaft is fixed with the first driving wheel, the upper portion of the first hollow rotating shaft is fixed with the first driven wheel, the first driving wheel and the first driven wheel are transmissionally connected through the first transmission belt, the bottom end of the third rotating shaft is fixed with the second driving wheel, the lower portion of the second hollow rotating shaft is fixed with the second driven wheel, and the second driving wheel and the second driven wheel are transmissionally connected through the second transmission belt.

[0017] The present application has the following beneficial effects:

[0018] 1. The carbon dioxide injector is used to inject normal-temperature carbon dioxide into clean water, so that the carbon dioxide is dissolved in the clean water to form carbonated water, the carbonated water and the alkaline wastewater are mixed and reacted in the reactor, and the low-temperature carbon dioxide is injected into the reactor, which not only has a cooling effect but also has a pressurizing effect, so that the carbon dioxide can be well neutralized with the alkaline substances in the alkaline wastewater, the treatment efficiency is high, the treatment effect is good, and after the treatment is completed, the pressure relief device is used for pressure relief treatment, and the carbon dioxide and water are recycled and used, so that resource waste is avoided.

[0019] 2. The first liquid distribution assembly sprays the carbonated water, and the second liquid distribution assembly sprays the alkaline wastewater, so that the carbonated water and the alkaline wastewater are collided at the upper part of the reaction tank, the carbonated water and the alkaline wastewater are better mixed and dispersed, the contact area between them is increased, and thus the mass transfer and the reaction process are facilitated.

[0020] 3、The carbonated water and alkaline wastewater after collision fall into the filler layer, and the filler layer provides a large contact area for the carbonated water and alkaline wastewater, so that they can be fully contacted and mixed, thereby improving the reaction efficiency.

[0021] 4、The mixed liquid falls into the lower part of the reaction tank and is stirred by the stirring assembly. The stirring assembly can stir and mix the mixed liquid in a large range and more comprehensively, thereby further improving the mixing uniformity of the mixed liquid and greatly improving the reaction efficiency.

[0022] 5、No additional power source is needed, and only one motor is needed to realize uniform liquid distribution of the second liquid distribution assembly and stirring and mixing of the mixed liquid. The two are used together, and the design is ingenious.

[0023] 6、Part of the carbon dioxide enters the stirring assembly through the second pipeline. While performing the stirring operation, the carbon dioxide is discharged from the stirring assembly to disturb the mixed liquid, improve the mixing effect, and achieve the effect of increasing the pressure.

[0024] 7、When the solubility of carbon dioxide is high enough, the carbon dioxide is directly dissolved in the mixed liquid; when the solubility of carbon dioxide is not high enough, the carbon dioxide rises into the filler layer, and the rising carbon dioxide and the descending alkaline wastewater perform efficient mass transfer in the filler layer.

[0025] 8、The cooling jacket reduces the temperature of the carbon dioxide transported through the second pipeline, further improves the solubility of the carbon dioxide, improves the reaction efficiency, and reduces the requirement for pressure.

[0026] 9、The first hollow shaft is driven to rotate by the transmission assembly, so that the liquid distribution disc rotates to realize rotary water spraying, which can better collide with the carbonated water.

[0027] 10、The first liquid distribution hole and the second liquid distribution hole are upwardly inclined, so that the carbonated water and the alkaline wastewater can better collide and be broken into smaller droplets, which helps to increase the contact area between the carbonated water and the alkaline wastewater, thereby promoting their interaction and mixing and providing more reaction interfaces to accelerate the reaction speed.

[0028] 11、The stirring assembly realizes horizontal stirring and vertical stirring to stir the mixed liquid from different height positions.

[0029] 12、The carbon dioxide enters the second hollow shaft through the second pipeline and is discharged through the vertical air holes and the horizontal air holes, respectively. The carbon dioxide is uniformly distributed and more fully mixed and disturbed with the mixed liquid.

[0030] 13、The centrifugal force realizes the effect of automatic scraping, and at the same time of cleaning, the mixed liquid driven by the carbon dioxide blown out of the horizontal air holes impacts the scraped place, which can better remove the scraped scale from the inner wall of the reaction tank. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 is a system block diagram of the present application.

[0032] Figure 2 is a structural schematic diagram of the reactor of the present application.

[0033] Figure 3 is a structural schematic diagram of the cooperation of the first and second cloth liquid assemblies of the present application.

[0034] Figure 4 is Figure 3 is an enlarged structural schematic diagram of A.

[0035] Figure 5 is a sectional structural schematic diagram of the stirring assembly of the present application.

[0036] Figure 6 is Figure 5 is an enlarged structural schematic diagram of B.

[0037] The signs in the drawings are as follows: 1 - carbon dioxide storage tank, 2 - carbon dioxide injector, 3 - reactor, 4 - pressure release device, 5 - water collecting tank, 6 - filter, 7 - first pump, 8 - second pump, 9 - first pipeline, 10 - second pipeline, 11 - third pipeline, 12 - fourth pipeline, 13 - fifth pipeline, 14 - sixth pipeline, 15 - seventh pipeline, 16 - eighth pipeline, 17 - ninth pipeline, 31 - reaction tank, 32 - first cloth liquid assembly, 33 - second cloth liquid assembly, 34 - filler layer, 35 - stirring assembly, 36 - motor, 37 - transmission assembly, 18 - cooling jacket, 321 - cloth liquid ring, 322 - first liquid cavity, 323 - first cloth liquid hole, 331 - first bearing seat, 332 - first hollow rotating shaft, 333 - first sealing member, 334 - cloth liquid disc, 335 - second liquid cavity, 336 - second cloth liquid hole, 351 - second bearing seat, 352 - second hollow rotating shaft, 353 - transverse hollow stirring rod, 354 - second sealing member, 355 - vertical hollow stirring rod, 356 - vertical air hole, 357 - transverse air hole, 358 - guide rod, 359 - spring, 3510 - scraper, 371 - third rotating shaft, 372 - third bearing seat, 373 - first driving wheel, 374 - first driven wheel, 375 - first transmission belt, 376 - second driving wheel, 377 - second driven wheel, 378 - second transmission belt. DETAILED DESCRIPTION

[0038] The present application will be further described in conjunction with the drawings and specific embodiments.

[0039] The contents not described in detail in the specification belong to the prior art known to those skilled in the art. In the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" and the like are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0040] The alkaline wastewater treatment method provided in the embodiment includes the following steps:

[0041] The clean water and the normal temperature carbon dioxide are sent into the carbon dioxide injector 2 for mixing to form carbonated water, and then the carbonated water and the alkaline wastewater are sent to the reactor 3 for reaction, the reaction pressure is 0.4-0.6 Mpa, and the carbon dioxide with a temperature of 5-10℃ is sent into the reactor 3, the water outlet of the reactor 3 enters the pressure reducer 4 for pressure reduction treatment, so that the carbon dioxide in the water is released and backflows into the carbon dioxide injector 2, the filtered water after pressure reduction enters the water collecting tank 5 for collection, and then the clean water is obtained after filtering through the filter 6, and the clean water is reused to the carbon dioxide injector 2.

[0042] The normal temperature carbon dioxide is injected into the clean water through the carbon dioxide injector 2, so that the carbon dioxide is dissolved in the clean water to form carbonated water, and the carbonated water is mixed and reacted with the alkaline wastewater in the reactor 3. And the low-temperature carbon dioxide is injected into the reactor 3, which not only has a cooling effect, but also has a pressurizing effect. The continuously input low-temperature carbon dioxide not only collides with the carbonated water and the alkaline wastewater to improve the gas-liquid mixing degree, but also reduces the temperature and increases the pressure in the reactor 3. In the low-temperature and high-pressure environment, the solubility of carbon dioxide in water is improved. When the reaction pressure reaches 0.6 Mpa and the reaction temperature is 10℃, the solubility of carbon dioxide in water is 6.75 g / L. This makes the carbon dioxide well neutralized and treated with the alkaline substances in the alkaline wastewater, and the treatment efficiency and effect are high. And the water pressure is reduced through the setting of the pressure reducer 4, and the solubility of carbon dioxide in water is reduced due to the reduction of pressure, so that the carbon dioxide in the water is released and then backflows to the carbon dioxide injector 2 for recycling, so that the carbon dioxide is recycled and used, avoiding resource waste and excessive emission of carbon dioxide, and protecting the environment. The water outlet of the pressure reducer 4 enters the water collecting tank 5, is filtered through the filter 6, and is reused to the carbon dioxide injector 2 through the first pump 7, so that the carbon dioxide and water are recycled, and resources are saved.

[0043] As Figures 1 to 6 shown, the embodiment also provides a basic wastewater treatment system for implementing the above-mentioned basic wastewater treatment method, comprising:

[0044] a carbon dioxide storage tank 1, a carbon dioxide injector 2, a reactor 3, a pressure reducer 4, a water collecting tank 5, a filter 6, a first pump 7, and a second pump 8.

[0045] The carbon dioxide storage tank 1 has two outlets, one of which is connected to the gas inlet of the carbon dioxide injector 2 through a first pipeline 9, and the other is connected to the reactor 3 through a second pipeline 10. The water outlet of the filter 6 is connected to the liquid inlet of the carbon dioxide injector 2 through a third pipeline 11, which is provided with the first pump 7. The outlet of the carbon dioxide injector 2 is connected to the reactor 3 through a fourth pipeline 12. The basic wastewater enters the reactor 3 through a fifth pipeline 13. The water outlet of the reactor 3 is connected to the pressure reducer 4 through a sixth pipeline 14. The water outlet of the pressure reducer 4 is connected to the water collecting tank 5 through a seventh pipeline 15. The water collecting tank 5 is connected to the filter 6 through an eighth pipeline 16. The exhaust port of the pressure reducer 4 is connected to the first pipeline 9 through a ninth pipeline 17, which is provided with the second pump 8.

[0046] The filtered clean water obtained after treatment by the filter 6 is pumped into the carbon dioxide injector 2 by the first pump 7. Part of the gaseous carbon dioxide in the carbon dioxide storage tank 1 enters the carbon dioxide injector 2 through the first pipeline 9 and mixes with the clean water, causing the carbon dioxide to dissolve in the clean water to form carbonated water, which then enters the reactor 3 through the fourth pipeline 12. The basic wastewater enters the reactor 3 through the fifth pipeline 13 and mixes with the carbonated water. At the same time, another part of the gaseous carbon dioxide is sent into the reactor 3 through the second pipeline 10 and reacts with the basic wastewater and the carbonated water to neutralize the basic wastewater. The treated wastewater enters the pressure reducer 4 through the sixth pipeline 14. After decompression by the pressure reducer 4, the solubility of carbon dioxide in water decreases, and carbon dioxide is released from the water and enters the ninth pipeline 17, which is pressurized by the second pump 8 and delivered to the first pipeline 9, then to the carbon dioxide injector 2. The effluent from the pressure reducer enters the water collecting tank 5 through the seventh pipeline 15 and enters the filter 6 through the eighth pipeline 16 for filtration treatment. The treated clean water is pumped into the carbon dioxide injector 2 through the third pipeline 11 and the first pump 7. Through the pressurization-decompression operation, the carbon dioxide and water are recycled.

[0047] The reactor 3 includes a reaction tank 31, a first liquid distribution assembly 32, a second liquid distribution assembly 33, a filler layer 34, a stirring assembly 35, a motor 36, and a transmission assembly 37.

[0048] The upper part of the reaction tank 31 is provided with a filler layer 34, the inside of the reaction tank 31 above the filler layer 34 is fixed with a first liquid distribution assembly 32, the fourth pipeline 12 communicates with the first liquid distribution assembly 32, the top of the reaction tank 31 is provided with a second liquid distribution assembly 33, the liquid distribution end of the second liquid distribution assembly 33 extends to the inside of the reaction tank 31 and is surrounded by the first liquid distribution assembly 32, the fifth pipeline 13 extends to the second liquid distribution assembly 33, the bottom of the reaction tank 31 is provided with a stirring assembly 35, the stirring end of the stirring assembly 35 is located in the lower part of the reaction tank 31 and below the filler layer 34, the second pipeline 10 extends to the stirring assembly 35, the top of the reaction tank 31 is fixed with a motor 36, the motor 36 is in driving connection with the second liquid distribution assembly 33 and the stirring assembly 35 through a transmission assembly 37.

[0049] The carbonated water enters the first liquid distribution assembly 32 through the fourth pipeline 12, the alkaline wastewater enters the second liquid distribution assembly 33 through the fifth pipeline 13, the carbonated water is sprayed out through the first liquid distribution assembly 32 and the alkaline wastewater is sprayed out through the second liquid distribution assembly 33, the carbonated water and the alkaline wastewater collide at the upper part of the reaction tank 31, so that they are better mixed and dispersed and the contact area between them is increased, thereby facilitating the mass transfer and the reaction process. After the collision, the carbonated water and the alkaline wastewater fall to the filler layer 34, the filler layer 34 provides a large contact area for the carbonated water and the alkaline wastewater, so that they are fully contacted and mixed, and the reaction efficiency is improved. Finally, the mixed liquid falls to the lower part of the reaction tank 31 and is stirred by the stirring assembly 35, so that the mixed liquid is stirred and mixed in a large range and more comprehensively, the mixing uniformity of the mixed liquid is further improved, and the reaction efficiency is greatly improved. Moreover, no additional power source is needed, only one motor 36 is needed to realize the uniform liquid distribution of the second liquid distribution assembly 33 and the stirring and mixing of the mixed liquid, and the two are used in combination, which is a clever design. Part of the carbon dioxide enters the stirring assembly 35 through the second pipeline 10, while the stirring operation is performed, the carbon dioxide is discharged from the stirring assembly 35 to disturb the mixed liquid, improve the mixing effect, and achieve the effect of increasing the pressure. When the solubility of the carbon dioxide is high enough, the carbon dioxide is directly dissolved in the mixed liquid. When the solubility of the carbon dioxide is not high enough, the carbon dioxide rises into the filler layer 34 and the rising carbon dioxide and the descending alkaline wastewater perform efficient mass transfer.

[0050] The second pipeline 10 is provided with a cooling jacket 18. The cooling jacket 18 reduces the temperature of the carbon dioxide transported through the second pipeline 10, further improves the solubility of the carbon dioxide, improves the reaction efficiency, and reduces the requirement for the pressure.

[0051] The first liquid distribution assembly 32 comprises a liquid distribution ring 321, a first liquid cavity 322, and a first liquid distribution hole 323. The liquid distribution ring 321 is fixed to the top of the inside of the reaction tank 31. The first liquid cavity 322 is arranged in the inside of the liquid distribution ring 321. The first liquid distribution hole 323 is arranged in the inner side wall of the first liquid cavity 322 in the circumferential direction. The carbonated water enters the first liquid cavity 322 through the fourth pipeline 12 and is sprayed inward through the first liquid distribution hole 323. The carbonated water collides with the alkaline wastewater sprayed by the second liquid distribution assembly 33.

[0052] The second liquid distribution assembly 33 comprises a first bearing seat 331, a first hollow rotating shaft 332, a first sealing element 333, a liquid distribution disc 334, a second liquid cavity 335, and a second liquid distribution hole 336. The first bearing seat 331 is fixed to the top wall of the reaction tank 31. The bottom end of the first hollow rotating shaft 332 penetrates through the first bearing seat 331 and the top wall of the reaction tank 31 and extends into the liquid distribution ring 321 to be fixedly connected with the liquid distribution disc 334. The first hollow rotating shaft 332 is sealed between the top wall of the reaction tank 31. The second liquid cavity 335 is arranged in the liquid distribution disc 334. The second liquid distribution hole 336 is arranged in the outer side wall of the second liquid cavity 335 in the circumferential direction. The first liquid distribution hole 323 is arranged opposite to the second liquid distribution hole 336. The fifth pipeline 13 extends into the inside of the first hollow rotating shaft 332. The first sealing element 333 is arranged between the fifth pipeline 13 and the first hollow rotating shaft. The alkaline wastewater enters the inside of the first hollow rotating shaft 332 through the fifth pipeline 13 and then enters the second liquid cavity 335. The alkaline wastewater is sprayed outward through the second liquid distribution hole 336 in the circumferential direction. The alkaline wastewater collides with the carbonated water sprayed inward through the first liquid distribution hole 323. The first hollow rotating shaft 332 is driven to rotate by the transmission assembly 37. The liquid distribution disc 334 rotates to realize the rotating water spraying. The carbonated water and the alkaline wastewater can better collide.

[0053] The first liquid distribution hole 323 and the second liquid distribution hole 336 are both arranged upwardly inclined. The first liquid distribution hole 323 and the second liquid distribution hole 336 arranged upwardly inclined can make the carbonated water and the alkaline wastewater better collide and more easily break into smaller droplets. The carbonated water and the alkaline wastewater can better collide and more easily break into smaller droplets. The contact area between the carbonated water and the alkaline wastewater is increased. The interaction and mixing between the carbonated water and the alkaline wastewater are promoted. More reaction interfaces are provided. The reaction speed is accelerated.

[0054] The stirring assembly 35 comprises a second bearing seat 351, a second hollow rotating shaft 352, a horizontal hollow stirring rod 353, a second sealing member 354, and a vertical hollow stirring rod 355. The second bearing seat 351 is fixed to the bottom wall of the reaction tank 31. The second hollow rotating shaft 352 penetrates through the second bearing seat 351 and the bottom wall of the reaction tank 31 and extends to the lower part of the inside of the reaction tank 31 and is fixedly connected with a plurality of horizontal hollow stirring rods 353. The second hollow rotating shaft 352 is sealingly arranged between the bottom wall of the reaction tank 31. The outer end of the horizontal hollow stirring rod 353 is fixedly connected with the vertical hollow stirring rod 355. The second pipeline 10 extends to the second hollow rotating shaft 352. The second hollow rotating shaft 352 is provided with the second sealing member 354 between the second pipeline 10. The upper and lower side walls of the horizontal hollow stirring rod 353 are provided with a plurality of vertical air holes 356. The outer side wall of the vertical hollow stirring rod 355 is provided with a plurality of horizontal air holes 357. The transmission assembly 37 drives the second hollow rotating shaft 352 to rotate, so that the horizontal hollow stirring rod 353 rotates and drives the vertical hollow stirring rod 355 to rotate, thereby realizing horizontal stirring and vertical stirring and stirring the mixed liquid from different height positions. At the same time, the carbon dioxide enters the second hollow rotating shaft 352 through the second pipeline 10 and is discharged through the vertical air holes 356 and the horizontal air holes 357, respectively. The carbon dioxide is uniformly distributed and is more fully mixed and disturbed with the mixed liquid.

[0055] The stirring assembly 35 further comprises a guide rod 358, a spring 359, and a scraper 3510. The outer side wall of the vertical hollow stirring rod 355 is fixedly connected with the guide rod 358. The scraper 3510 is sleeved on the guide rod 358. The inner side wall of the scraper 3510 is fixedly connected with the spring 359. The inner end of the spring 359 is fixedly connected with the outer side wall of the vertical hollow stirring rod 355. Due to the centrifugal force, the scraper 3510 moves outward and the spring 359 is elongated while the second hollow rotating shaft 352 rotates. The scraper 3510 performs a scraping action on the side wall of the reaction tank 31 to clean the scale. At the same time, the carbon dioxide blown out of the horizontal air holes 357 drives the mixed liquid to impact the scraped part, so that the scraped scale can be better removed from the inner side wall of the reaction tank 31. When the rotating speed of the second hollow rotating shaft 352 is reduced or stopped, the spring 359 is contracted and the scraper 3510 moves inward to reset and move away from the inner side wall of the reaction tank 31.

[0056] The transmission assembly 37 comprises a third rotating shaft 371, a third bearing seat 372, a first driving wheel 373, a first driven wheel 374, a first transmission belt 375, a second driving wheel 376, a second driven wheel 377 and a second transmission belt 378. The third bearing seat 372 is fixed to the right side wall of the reaction tank 31, the bottom end of the motor 36 is fixed with the third rotating shaft 371, the third rotating shaft 371 penetrates through the third bearing seat 372, the upper portion of the third rotating shaft 371 is fixed with the first driving wheel 373, the upper portion of the first hollow rotating shaft 332 is fixed with the first driven wheel 374, the first driving wheel 373 and the first driven wheel 374 are transmissionally connected through the first transmission belt 375, the bottom end of the third rotating shaft 371 is fixed with the second driving wheel 376, the lower portion of the second hollow rotating shaft 352 is fixed with the second driven wheel 377, and the second driving wheel 376 and the second driven wheel 377 are transmissionally connected through the second transmission belt 378. When the motor 36 rotates, the third rotating shaft 371 rotates, the first driving wheel 373 rotates, the first driven wheel 374 rotates through the first transmission belt 375, and the first hollow rotating shaft 332 rotates. At the same time, the third rotating shaft 371 rotates to drive the second driving wheel 376 to rotate, the second driven wheel rotates through the second transmission belt 378, and the second hollow rotating shaft 352 rotates. Thus, through the transmission assembly 37, only one motor 36 is needed to synchronously drive the second liquid distribution assembly 33 and the stirring assembly 35 to rotate.

[0057] The above embodiments are only used to illustrate the technical solutions of the present application, rather than limit them. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacements for some technical features, and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. An alkaline wastewater treatment system characterized by, The system comprises a carbon dioxide storage tank, a carbon dioxide injector, a reactor, a pressure reducer, a water collecting tank, a filter, a first pump and a second pump. The carbon dioxide storage tank has two outlets, one of which is connected to the gas inlet of the carbon dioxide injector through a first pipeline, and the other is connected to the reactor through a second pipeline. The water outlet of the filter is connected to the liquid inlet of the carbon dioxide injector through a third pipeline, and the third pipeline is provided with a first pump. The outlet of the carbon dioxide injector is connected to the reactor through a fourth pipeline, and the alkaline wastewater enters the reactor through a fifth pipeline. The water outlet of the reactor is connected to the pressure reducer through a sixth pipeline, the water outlet of the pressure reducer is connected to the water collecting tank through a seventh pipeline, the water collecting tank is connected to the filter through an eighth pipeline, the exhaust port of the pressure reducer is connected to the first pipeline through a ninth pipeline, and the ninth pipeline is provided with a second pump. The reactor comprises a reaction tank, a first liquid distribution assembly, a second liquid distribution assembly, a filler layer, a stirring assembly, a motor and a transmission assembly. The inside of the reaction tank is provided with a filler layer at the top, and a first liquid distribution assembly is fixed inside the reaction tank above the filler layer, and the fourth pipeline is connected to the first liquid distribution assembly. The top of the reaction tank is provided with a second liquid distribution assembly, the liquid distribution end of which extends to the inside of the reaction tank and is surrounded by the first liquid distribution assembly, and the fifth pipeline extends into the second liquid distribution assembly. The bottom of the reaction tank is provided with a stirring assembly, and the stirring end of the stirring assembly is located in the lower part of the reaction tank and below the filler layer, and the second pipeline extends into the stirring assembly. The top of the reaction tank is fixed with a motor, and the motor is drivingly connected to the second liquid distribution assembly and the stirring assembly through a transmission assembly. The first liquid distribution assembly comprises a liquid distribution ring, a first liquid cavity and a first liquid distribution hole. The liquid distribution ring is fixed inside the reaction tank at the top, the inside of the liquid distribution ring is provided with a first liquid cavity, and the inner side wall of the first liquid cavity is provided with a plurality of first liquid distribution holes in the circumferential direction. The alkaline wastewater treatment system is used for treating alkaline wastewater, comprising the following steps: The clean water and normal temperature carbon dioxide are sent into the carbon dioxide injector for mixing to form carbonated water, and then the carbonated water and the alkaline wastewater are sent to the reactor for reaction under a reaction pressure of 0.4-0.6 Mpa, while the carbon dioxide with a temperature of 5-10℃ is sent into the reactor, the water outlet of the reactor enters the pressure reducer for pressure reduction treatment, so that the carbon dioxide in the water is released and backflows into the carbon dioxide injector, the filtered water after pressure reduction enters the water collecting tank for collection, and then the clean water is obtained after filtering through the filter, and the clean water is reused to the carbon dioxide injector.

2. The alkaline wastewater treatment system according to claim 1, wherein: The second pipeline is provided with a cooling jacket.

3. The alkaline wastewater treatment system according to claim 1, wherein: The second liquid distribution assembly comprises a first bearing seat, a first hollow shaft, a first sealing element, a liquid distribution disc, a second liquid cavity and a second liquid distribution hole. ​ The top wall of the reaction tank is fixed with a first bearing seat, the bottom end of the first hollow rotating shaft penetrates through the first bearing seat and the top wall of the reaction tank, and extends into the liquid distribution ring fixedly connected with a liquid distribution disc, and the first hollow rotating shaft and the top wall of the reaction tank are sealingly arranged; A second liquid cavity is formed in the liquid distribution disc, a plurality of second liquid distribution holes are formed in the outer side wall of the second liquid cavity in the circumferential direction, and the first liquid distribution hole and the second liquid distribution hole are oppositely arranged; The fifth pipeline extends into the first hollow rotating shaft, and a first sealing member is arranged between the fifth pipeline and the first hollow rotating shaft.

4. The alkaline wastewater treatment system according to claim 3, characterized in that: The first liquid distribution hole and the second liquid distribution hole are both arranged upwardly inclined.

5. The alkaline wastewater treatment system according to claim 3, characterized in that: The stirring assembly comprises a second bearing seat, a second hollow rotating shaft, a transverse hollow stirring rod, a second sealing member, and a vertical hollow stirring rod; The bottom wall of the reaction tank is fixed with a second bearing seat, the second hollow rotating shaft penetrates through the second bearing seat and the bottom wall of the reaction tank, and extends into the lower part of the reaction tank fixedly connected with a plurality of transverse hollow stirring rods, the second hollow rotating shaft and the bottom wall of the reaction tank are sealingly arranged, and the outer end of the transverse hollow stirring rod is fixedly connected with a vertical hollow stirring rod; The second pipeline extends into the second hollow rotating shaft, and a second sealing member is arranged between the second hollow rotating shaft and the second pipeline; The upper and lower side walls of the transverse hollow stirring rod are both provided with a plurality of vertical air holes; The outer side wall of the vertical hollow stirring rod is provided with a plurality of transverse air holes.

6. The alkaline wastewater treatment system according to claim 5, characterized in that: The stirring assembly further comprises a guide rod, a spring, and a scraper; The outer side wall of the vertical hollow stirring rod is fixed with a guide rod, the scraper is sleeved on the guide rod, the inner side wall of the scraper is fixed with a spring, and the inner end of the spring is fixedly connected with the outer side wall of the vertical hollow stirring rod.

7. The alkaline wastewater treatment system according to claim 5, characterized in that: The transmission assembly comprises a third rotating shaft, a third bearing seat, a first driving wheel, a first driven wheel, a first transmission belt, a second driving wheel, a second driven wheel, and a second transmission belt; The right side wall of the reaction tank is fixed with a third bearing seat, the bottom end of the motor is fixed with a third rotating shaft, and the third rotating shaft penetrates through the third bearing seat; The upper part of the third rotating shaft is fixed with a first driving wheel, the upper part of the first hollow rotating shaft is fixed with a first driven wheel, and the first driving wheel and the first driven wheel are drivingly connected through a first transmission belt; The bottom end of the third rotating shaft is fixed with a second driving wheel, the lower part of the second hollow rotating shaft is fixed with a second driven wheel, and the second driving wheel and the second driven wheel are drivingly connected through a second transmission belt.

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