Continuous treatment system for taurine waste liquid
By combining evaporation crystallization and electrodialysis technology, and utilizing the residual heat of steam and frozen brine, rapid and efficient treatment of taurine waste liquid is achieved, solving the problems of complex, time-consuming and high-cost existing processes, and achieving continuous salt crystallization and efficient desalination.
Patent Information
- Application Number
- CN202510952732.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-10
- Publication Date
- 2025-09-30
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
The existing taurine waste liquid treatment process is complex, time-consuming and costly. Conventional treatment methods produce additional wastewater and make it difficult to achieve efficient and continuous treatment.
The evaporation crystallization is combined with electrodialysis technology. Through a continuous treatment system consisting of a concentration kettle, crystallization kettle, centrifuge, electrodialysis device, etc., the residual heat of steam and the residual heat of frozen brine are used for heating and cooling to achieve continuous crystallization and precipitation of salts, reduce the introduction of impurities, and improve the desalination rate and fresh water quality.
The rapid and efficient treatment of taurine waste liquid was achieved, the complexity and cost of the treatment process were reduced, and the continuity and efficiency of the treatment process were ensured.
Smart Images
Figure CN120717637A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the field of wastewater treatment, in particular to a taurine waste liquid continuous treatment system. Background Art
[0002] During the production process of taurine, a certain amount of ammonium salt-containing wastewater is generated. The conventional treatment method for this ammonium salt-containing wastewater is to remove ammonium ions using biochemical methods, air stripping methods or steam stripping methods. The salt-containing wastewater is then passed through an ion exchange device to remove ions in the solution and then further concentrated using a reverse osmosis membrane. The concentrated liquid is crystallized and evaporated to obtain mixed salts, and the evaporated steam is condensed and recovered. On the one hand, the above treatment method will generate a portion of additional wastewater in the pre-treatment step. On the other hand, the treatment process is relatively long, the overall treatment process is complex, and the treatment cost is high. Summary of the Invention
[0003] The object of the present invention is to provide a continuous treatment system for taurine wastewater, which evaporates the taurine wastewater and then crystallizes the ammonium salt in the wastewater, thereby continuously treating the taurine wastewater and achieving the effect of rapid and efficient wastewater treatment.
[0004] The technical solution adopted in the present invention is as follows:
[0005] A taurine waste liquid continuous treatment system comprises a concentration kettle, which is connected to a feed port at the top of a crystallization kettle; the bottom end of the crystallization kettle is connected to a centrifuge, the liquid outlet of the centrifuge is connected to a collection tank, and the collection tank is connected to a heater; the heater is connected to a liquid inlet of an electrodialysis device through a pipeline, and a liquid pump is provided on the pipeline; the concentrated liquid outlet of the electrodialysis device is connected to a material inlet at the top of the concentration kettle; the fresh water outlet of the electrodialysis device is connected to a membrane filtration device, and the membrane filtration device is externally connected to a clear water tank; the top of the concentration kettle is connected to a gas-liquid separator device through a first vacuum pump, and the gas-liquid separator device is connected to the concentration kettle; a plurality of pH measuring devices are provided on the crystallization kettle, and the crystallization kettle is provided with a plurality of pH measuring devices. The top of the device is connected to the sulfuric acid tank; the top air outlet of the gas-liquid separator is connected to the condenser, the condenser is connected to the top of the temporary storage tank, the top air outlet of the temporary storage tank is connected to the vacuum device, and the vacuum device is connected to the tail gas absorption tower; a vent valve is provided on the top of the temporary storage tank; the temporary storage tank is connected to the clear water tank through a pipeline and a first valve is provided on the pipeline; a first heating device is provided on the concentration kettle, a second heating device is provided on the heater, and the steam inlet of the second heating device is connected to the steam outlet of the first heating device; a first refrigeration device is provided on the concentration kettle, a second refrigeration device is provided on the condenser, and the frozen brine inlet of the second refrigeration device is connected to the frozen brine outlet of the first refrigeration device.
[0006] The beneficial effects are as follows: taurine wastewater is fed into the concentration kettle from the feed pipe, the concentration kettle is heated, the generated steam is separated into gas and liquid in the gas-liquid separator device, the liquid flows back into the concentration kettle, and then the steam enters the condenser for condensation, the generated condensed water is temporarily stored in the temporary storage tank, and the volatilized gas enters the tail gas absorption tower through the vacuum device for absorption and treatment, and is discharged in compliance with the standards.
[0007] When the temporary storage tank is full, the drain valve and the first valve are opened to allow the condensed water to flow into the collection tank. The liquid from the concentrator enters the crystallizer for cooling and crystallization. Finally, the crystallized material is fed into a centrifuge for solid-liquid separation, and the resulting liquid is fed into the collection tank. The liquid from the collection tank is heated to 40°C by a heater before being fed into the electrodialysis unit. The concentrate outlet of the electrodialysis unit is connected to the material inlet at the top of the concentrator for further concentration. Because the liquid entering the electrodialysis unit is relatively hot, the increased temperature increases the ion transport rate within the water and reduces the resistance between the membrane and the solution, increasing the desalination capacity and rate, thereby improving the freshwater quality. Because the heater utilizes steam from the first heater on the concentrator, it effectively utilizes the residual heat of the steam from the first heater. The liquid at the concentrate outlet of the electrodialysis unit is already heated before entering the concentrator, making evaporation in the concentrator more energy-efficient. A second refrigeration unit is installed on the condenser, with the chilled brine inlet connected to the chilled brine outlet of the first refrigeration unit. This allows the residual heat of the chilled brine from the first refrigeration unit to be fully utilized for cooling, resulting in energy savings. The present invention continuously crystallizes the salts in the wastewater. The entire treatment process is mainly based on physical means, and no new impurities are introduced into the system. The entire treatment process is continuous, the treatment speed is fast, and the cost is relatively low.
[0008] As a preferred technical solution, the first heating device includes a first jacket arranged on the outer surface of the concentration kettle; a first heating coil is provided in the first jacket, and the inlet of the first heating coil is connected to the steam inlet pipe; the steam outlet of the first heating device is the outlet of the first heating coil; and the outlet of the first heating coil is connected to the first steam outlet pipe.
[0009] The second heating device includes a second jacket arranged on the outer surface of the heater, a second heating coil is provided in the second jacket, the steam inlet of the second heating device is the inlet of the second heating coil; the inlet of the second heating coil is connected to the first steam outlet pipe; the outlet of the second heating coil is connected to the second steam outlet pipe.
[0010] The first refrigeration device includes a third jacket arranged on the outer surface of the crystallization kettle; a first refrigeration coil is arranged in the third jacket, and the inlet of the first refrigeration coil is connected to the chilled brine inlet pipe; the chilled brine outlet of the first refrigeration device is the outlet of the first refrigeration coil, and the outlet of the first refrigeration coil is connected to the first chilled brine outlet pipe.
[0011] The second chilled brine heating device includes a fourth jacket arranged on the outer peripheral surface of the condenser, and a second refrigeration coil is arranged in the fourth jacket. The chilled brine inlet of the second refrigeration device is the inlet of the second refrigeration coil, and the inlet of the second refrigeration coil is connected to the first chilled brine outlet pipe; the outlet of the second refrigeration coil is connected to the second chilled brine outlet pipe.
[0012] As a preferred technical solution, a three-way valve is installed on the steam inlet pipe, connected to the bottom of the crystallizer via a steam branch pipe. A first stop valve is installed on the side of the three-way valve near the crystallizer, and a second stop valve is installed on the side of the three-way valve away from the crystallizer. Steam from the steam inlet pipe can directly enter the concentrator, directly increasing the temperature of the liquid in the concentrator during the initial operation.
[0013] As a preferred technical solution, a first stop valve on the steam inlet pipe is located near the crystallizer, a second stop valve is located on the steam inlet pipe away from the crystallizer, and is connected to a bypass pipe. A third stop valve is also provided on the bypass pipe. This technical solution can prevent pipe blockage.
[0014] As an optimal technical solution, the top of the concentration kettle is connected to the feed pipe, and the concentration kettle is connected to the feed port at the top of the crystallization kettle through a first pipeline; the bottom end of the crystallization kettle is connected to the centrifuge through a hose, the liquid outlet of the centrifuge is connected to the collection tank through a second pipeline, and the collection tank is connected to the heater through a third pipeline; the heater is connected to the liquid inlet of the electrodialysis device through a fourth pipeline; a liquid pump is provided on the fourth pipeline; the temporary storage tank is connected to the clear water tank through a fifth pipeline; and a first valve is provided on the fifth pipeline.
[0015] The concentrated liquid outlet of the electrodialysis device is connected to the top of the concentration kettle through the thirteenth pipeline; the fresh water outlet of the electrodialysis device is connected to the membrane filtration device through the sixth pipeline; The top of the concentration kettle is connected to the middle of the gas-liquid separator device through the seventh pipeline, and the first vacuum pump is arranged on the seventh pipeline; the liquid outlet at the bottom of the gas-liquid separator device is connected to the concentration kettle through the eighth pipeline; The gas outlet at the top of the gas-liquid separator device is connected to the condenser through the ninth pipeline, the condenser is connected to the top of the temporary storage tank through the tenth pipeline, the gas outlet at the top of the temporary storage tank is connected to the vacuum device through the eleventh pipeline, and the vacuum device is connected to the tail gas absorption tower through the twelfth pipeline.
[0016] As a preferred technical solution, a first filter is provided on the fifth pipeline; and a second filter is provided on the second pipeline.
[0017] As a preferred technical solution, several pH measuring devices are provided on the inner side wall of the crystallization kettle; the top of the crystallization kettle is connected to the sulfuric acid tank via a hose, and the hose is provided with an injection pump and a first shut-off valve; the pH measuring device is connected to a display provided on the top surface of the crystallization kettle via a circuit.
[0018] As an optimal technical solution, the vacuum device includes a second vacuum pump, a vacuum buffer tank, and a high-pressure airflow nozzle. The eleventh pipeline is connected to the vacuum buffer tank, the vacuum buffer tank is connected to the second vacuum pump, the second vacuum pump is connected to the high-pressure airflow nozzle, and the high-pressure airflow nozzle is connected to the twelfth pipeline.
[0019] As a preferred technical solution, an acid tank and an alkali tank are installed on the twelfth pipeline. This technical solution can remove ammonia and sulfur dioxide components of the volatile gas in the temporary storage tank.
[0020] As a preferred technical solution, the centrifuge includes a frame, a fixed drum vertically fixed to the frame and having a first opening at the top, and a rotary drum vertically arranged in the fixed drum; a plurality of liquid-spinning holes are provided on the peripheral side walls of the rotary drum; a second opening is provided at the top of the rotary drum; a shaft mounting hole is vertically provided at the center of the bottom surface of the fixed drum, a shaft is mounted on the shaft mounting hole, the top of the shaft is connected to the center of the bottom of the drum; and the shaft is connected to a motor arranged on the frame.
[0021] A lip portion inclined toward the center of the second opening is provided at the top of the circumferential wall of the drum, and a plurality of hooks are arranged in a ring array on the outer peripheral surface of the lip portion along the central axis of the rotating shaft. A plurality of filter cloth pieces are arranged in the drum, and a hanging ring is provided at the top of each filter cloth piece, and each hanging ring is connected to a hook; the height of each filter cloth piece is greater than the height of the circumferential wall of the drum; a plurality of rolling body mounting seats are provided in a ring array on the inner peripheral side surface of the top end of the circumferential wall of the fixed drum, and a rolling body is installed on each rolling body mounting seat, and the rolling body is in contact with the outer peripheral surface of the circumferential wall of the drum; a liquid outlet is provided at the bottom end of the fixed drum; and the bottom end of the hose is located above the second opening.
[0022] A slot opening downward is provided on the bottom of the drum, the horizontal cross-section of the slot is a polygon, the top of the rotating shaft is adapted to the polygon and can be inserted into the slot; two handles are vertically provided on the top of the rotating drum, and the central axes of the two handles pass through the central axis of the rotating shaft.
[0023] Using this technical solution, the cooled, crystallized liquid is introduced through a hose into the second opening. The drum rotates along its central axis. Crystallized particles in the liquid are trapped by the filter cloth and retained within the drum. The remaining liquid enters the fixed drum through the liquid-stripping hole and flows out through the liquid outlet. Compared to existing technologies that use only perforated drums for filtering, this solution solves the problems of drums with perforations that are too large to filter effectively, too small to be easily cleaned, and incomplete filtration. Taurine is not present in the filtrate. Because the filter cloth is hung on a hook, it can be removed and cleaned at any time. The first rolling element ensures stable drum rotation. A lip is provided at the top of the drum's sidewall, angled toward the center of the second opening, allowing for easy handling of the filter cloth when it is hung on the hook. Two handles allow for quick removal of the drum filled with solids and replacement of the drum for solid-liquid separation, enabling continuous operation. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] Figure 1It is a structural schematic diagram of a preferred embodiment of a taurine waste liquid continuous treatment system of the present invention.
[0025] Figure 2 yes Figure 1 A partial enlarged view of part A.
[0026] Figure 3 yes Figure 1 A partial enlarged view of part B.
[0027] Figure 4 yes Figure 3 A partial enlarged view of part E.
[0028] Figure 5 yes Figure 3 A partial enlarged view of part F.
[0029] Figure 6 yes Figure 3 A partial enlarged view of part G.
[0030] Figure 7 yes Figure 1 A partial enlarged view of part C.
[0031] Figure 8 yes Figure 1 A partial enlarged view of part D.
[0032] Figure 9 yes Figure 8 A partial enlarged view of part H.
[0033] Figure 10 yes Figure 8 A partial enlarged view of part I.
[0034] Figure 11 yes Figure 8 A partial enlarged view of part J.
[0035] Figure 12 It is a structural schematic diagram of another preferred embodiment of a continuous taurine waste liquid treatment system of the present invention.
[0036] Figure 13 yes Figure 12 A partial enlarged view of part K.
[0037] Wherein: concentrator 1; first vacuum pump 10; first jacket 11; first heating coil 12; steam inlet pipe 13; first steam outlet pipe 14; three-way valve 15; steam branch pipe 16; second stop valve 17; first stop valve 18; bypass pipe 19; third stop valve 110; first temperature measuring device 111; first pressure measuring device 112; first stirring device 113; first pressure relief valve 114; Crystallization kettle 2; hose 20; third jacket 21; first refrigeration coil 22; chilled brine inlet pipe 23; first chilled brine outlet pipe 24; second temperature measuring device 25; second pressure measuring device 26; second stirring device 27; first Y-type filter 28; second Y-type filter 29; Collection pool-3; Feed pipe 40; first pipeline 41; second pipeline 42; third pipeline 43; fourth pipeline 44; liquid pump 45; first valve 46; thirteenth pipeline 47; sixth pipeline 48; seventh pipeline 49; eighth pipeline 410; ninth pipeline 411; tenth pipeline 412; eleventh pipeline 413; twelfth pipeline 414; first filter 415; second filter 416; acid tank 417; alkali tank 418; Electrodialysis device 5; heater 50; membrane filtration device 51; concentrate outlet 52; fresh water outlet 53; second jacket 54; second heating coil 55; second steam outlet pipe 56; Gas-liquid separator device-6; Centrifuge-7; frame-71; fixed drum-72; rotating drum-73; rotating shaft-74; motor-75; drum lip-76; hook-77; filter cloth-78; hanging ring-79; rolling element-710; rolling element mounting seat-711; liquid outlet-712; liquid ejection hole-713; first opening-714; second opening-715; Condenser-8; fourth jacket-81; second refrigeration coil-82; second chilled brine outlet pipe-83; Temporary storage tank-9; vacuum device-91; second vacuum pump-910; vacuum buffer tank-911; high-pressure air flow nozzle-912; tail gas absorption tower-92; vent valve-93; liquid level gauge-94; pH measuring device 101; sulfuric acid tank 102; injection pump 103; first stop valve 104; line 105; display 106; hose 107. DETAILED DESCRIPTION
[0038] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0039] Example 1, as Figure 1-11 As shown, a taurine waste liquid continuous treatment system includes a concentration kettle 1, which is connected to the feed port at the top of a crystallization kettle 2; the bottom of the crystallization kettle 2 is connected to a centrifuge 7, the outlet of the centrifuge 7 is connected to a collection tank 3, and the collection tank 3 is connected to a heater 50. Figure 7 The heater 50 is connected to the liquid inlet of the electrodialysis device 5 via a pipeline, and a liquid pump 45 is provided on the pipeline 44.
[0040] The concentrate outlet 52 of the electrodialysis device 5 is connected to the material inlet at the top of the concentration reactor 1; the fresh water outlet 53 of the electrodialysis device 5 is connected to the membrane filtration device 51, and the membrane filtration device 51 is connected to the clean water tank through a hose 57. The clean water tank is not shown in the figure.
[0041] like Figure 3 As shown, the top of the concentration kettle 1 is connected to the gas-liquid separator device 6 through the first vacuum pump 10, and the gas-liquid separator device 6 is connected to the concentration kettle 1.
[0042] like Figure 2 The crystallization kettle 2 is provided with several pH measuring devices 101. Figure 1 As shown, the top of the crystallization kettle 2 is connected to the sulfuric acid tank 102. Figure 3 As shown, the top air outlet of the gas-liquid separator device 6 is connected to the condenser 8, the condenser 8 is connected to the top of the temporary storage tank 9, the air outlet at the top of the temporary storage tank 9 is connected to the vacuum device 91, and the vacuum device 91 is connected to the tail gas absorption tower 92; a vent valve 93 is provided at the top of the temporary storage tank 9.
[0043] like Figure 6 As shown, the temporary storage tank 9 is connected to the clean water tank through a pipeline, and a first valve 46 is provided on the pipeline.
[0044] A first heating device is provided on the concentration kettle 1, a second heating device is provided on the heater 50, and the steam inlet of the second heating device is connected to the steam outlet of the first heating device; a first refrigeration device is provided on the concentration kettle 1, and a second refrigeration device is provided on the condenser 8, and the chilled brine inlet of the second refrigeration device is connected to the chilled brine outlet of the first refrigeration device.
[0045] Specifically, such as Figure 5 As shown, the first heating device includes a first jacket 11 arranged on the outer surface of the concentration kettle 1; a first heating coil 12 is provided in the first jacket 11, and the inlet of the first heating coil 12 is connected to the steam inlet pipe 13; the steam outlet of the first heating device is the outlet of the first heating coil 12; the outlet of the first heating coil 12 is connected to the first steam outlet pipe 14.
[0046] like Figure 7 As shown, the second heating device includes a second jacket 54 arranged on the outer surface of the heater 50, and a second heating coil 55 is provided in the second jacket 54. The steam inlet of the second heating device is the inlet of the second heating coil 55; the inlet of the second heating coil 55 is connected to the first steam outlet pipe 14; and the outlet of the second heating coil 55 is connected to the second steam outlet pipe 56.
[0047] like Figure 2As shown, the first refrigeration device includes a third jacket 21 arranged on the outer peripheral surface of the crystallization kettle 2; a first refrigeration coil 22 is provided in the third jacket 21, and the inlet of the first refrigeration coil 22 is connected to the chilled brine inlet pipe 23; the chilled brine outlet of the first refrigeration device is the outlet of the first refrigeration coil 22, and the outlet of the first refrigeration coil 22 is connected to the first chilled brine outlet pipe 24.
[0048] like Figure 4 As shown, the second chilled brine heating device includes a fourth jacket 81 arranged on the outer surface of the condenser 8, and a second refrigeration coil 82 is provided in the fourth jacket 81. The chilled brine inlet of the second refrigeration device is the inlet of the second refrigeration coil 82, and the inlet of the second refrigeration coil 82 is connected to the first chilled brine outlet pipe 24; the outlet of the second refrigeration coil 82 is connected to the second chilled brine outlet pipe 83.
[0049] like Figure 5 As shown, a three-way valve 15 is provided on the steam inlet pipe 13, which is connected to the bottom end of the crystallizer 2 via a steam branch pipe 16. A first stop valve 18 is provided on the side of the three-way valve 15 on the steam inlet pipe 13 near the crystallizer 2, and a second stop valve 17 is provided on the side of the three-way valve 15 on the steam inlet pipe 13 away from the crystallizer 2. Steam from the steam inlet pipe 13 can directly enter the concentrator 1, thereby directly increasing the temperature of the liquid in the concentrator 1 during the initial operation.
[0050] The first stop valve 18 on the steam inlet pipe 13 is close to the crystallization kettle 2 side, and the second stop valve 17 on the steam inlet pipe 13 is far away from the crystallization kettle 2 side and is connected to the bypass pipe 19, and the bypass pipe 19 is provided with a third stop valve 110. This technical solution can prevent pipeline blockage.
[0051] like Figure 1-3 As shown, the top of the concentration kettle 1 is connected to the feed pipe 40, and the concentration kettle 1 is connected to the feed port at the top of the crystallization kettle 2 through a first pipeline 41. The bottom end of the crystallization kettle 2 is connected to the centrifuge 7 through a hose 20, and the liquid outlet of the centrifuge 7 is connected to the collection tank 3 through a second pipeline 42. Figure 7 As shown, the collection tank 3 is connected to the heater 50 via a third pipe 43; the heater 50 is connected to the liquid inlet of the electrodialysis unit 5 via a fourth pipe 44. A liquid extraction pump 45 is provided on the fourth pipe 44. The temporary storage tank 9 is connected to an external clean water tank via a fifth pipe 45 (the clean water tank is not shown). A first valve 46 is provided on the fifth pipe 45. The function of the temporary storage tank 9 is to ensure that volatile gases from the liquid in the condenser 8 can be effectively removed when the vacuum device 91 is in operation.
[0052] like Figure 1 As shown, the concentrated liquid outlet 52 of the electrodialysis device 5 is connected to the top of the concentration reactor 1 through the thirteenth pipeline 47; the fresh water outlet 53 of the electrodialysis device 5 is connected to the membrane filtration device 51 through the sixth pipeline 48.
[0053] like Figure 3 As shown, the top of the concentrator 1 is connected to the middle of the gas-liquid separator 6 via a seventh pipeline 49. The first vacuum pump 10 is mounted on this seventh pipeline 49; this seventh pipeline 49 serves as the steam outlet. The liquid outlet at the bottom of the gas-liquid separator 6 is connected to the concentrator 1 via an eighth pipeline 410, which serves as the liquid return line.
[0054] like Figure 3 As shown, the top outlet of the gas-liquid separator device 6 is connected to the condenser 8 via a ninth pipeline 411, the condenser 8 is connected to the top of the temporary storage tank 9 via a tenth pipeline 412, the top outlet of the temporary storage tank 9 is connected to the vacuum device 91 via an eleventh pipeline 413, and the vacuum device 91 is connected to the tail gas absorption tower 92 via a twelfth pipeline 414. A first filter 415 is provided on the fifth pipeline 45, and a second filter 416 is provided on the second pipeline 42.
[0055] like Figure 2 As shown, three pH measuring devices 101 are provided on the inner wall of the crystallization kettle 2; the top of the crystallization kettle 2 is connected to the sulfuric acid tank 102 via a hose 107, and the hose 107 is provided with an injection pump 103 and a first stop valve 104; the pH measuring device 101 is connected to a display 106 provided on the top surface of the crystallization kettle 2 via a line 105.
[0056] like Figure 6 As shown, the vacuum device 91 includes a second vacuum pump 910, a vacuum buffer tank 911, and a high-pressure airflow nozzle 912. The eleventh pipeline 413 is connected to the vacuum buffer tank 911, the vacuum buffer tank 911 is connected to the second vacuum pump 910, the second vacuum pump 910 is connected to the high-pressure airflow nozzle 912, and the high-pressure airflow nozzle 912 is connected to the twelfth pipeline 414.
[0057] like Figure 8-11 As shown, the centrifuge includes a frame 71, a fixed drum 72 vertically fixed to the frame 71 and having a first opening 714 at the top, and a rotating drum 73 vertically arranged within the fixed drum 72; a plurality of liquid-spinning holes 713 are provided on the peripheral sidewalls of the rotating drum 73; a second opening 715 is provided at the top of the rotating drum 73; a rotating shaft mounting hole is vertically provided at the center of the bottom surface of the fixed drum 72, and a rotating shaft 74 is mounted on the rotating shaft mounting hole. The top of the rotating shaft 74 is connected to the center of the bottom of the rotating drum 73; the rotating shaft 74 is connected to a motor 75 arranged on the frame 71. Specifically, a driving wheel 741 is coaxially mounted on the rotating shaft 74, and an output pulley 751 of the motor 75 is connected to the driving wheel 741 via a belt 752.
[0058] A slot 731 opening downward is provided on the bottom surface of the rotating drum 73. The horizontal cross-section of the slot 731 is a polygon. The top of the rotating shaft is adapted to the polygon and can be inserted into the slot 731. Two handles 732 are vertically provided on the top of the rotating drum 73. The central axes of the two handles 732 pass through the central axis of the rotating shaft 74.
[0059] The top of the sidewall of the rotating drum 73 is provided with a lip portion 76 that is inclined toward the center of the second opening 715. The lip portion 76 is shaped like a trumpet, narrow at the bottom and narrow at the top. The outer surface of the lip portion 76 is provided with a plurality of hooks 77 arranged in a circular array along the central axis of the rotating shaft 74. Inside the rotating drum 73 are a plurality of filter cloth sheets 78, each with a hanging ring 79 at the top, each connected to a hook 77. The height of each filter cloth sheet 78 is greater than the height of the sidewall of the rotating drum 73. A plurality of roller mounting seats 711 are provided in a circular array on the inner side surface of the top of the sidewall of the fixed drum 72. Each roller mounting seat 711 is mounted on a roller 710, which contacts the outer surface of the sidewall of the rotating drum 73. A liquid outlet 712 is provided at the bottom end of the fixed drum 72. Specifically, the liquid outlet 712 is located at the bottom end of the sidewall of the fixed drum 72. The liquid outlet 712 is connected to the second pipeline 42. The bottom end of the hose 20 is located above the second opening 715. The cooled crystallized liquid is introduced from hose 20 into second opening 715. The drum rotates along the central axis of shaft 74. Crystallized particles in the liquid are trapped by filter cloth 78 and retained within drum 73. The remaining liquid enters fixed drum 72 through liquid-stripping holes 713 and flows out through liquid outlet 712. Compared to the prior art, which uses only drums with filter holes for filtering, this method solves the problem of drum holes being too large to filter effectively, too small to be easily cleaned, and incomplete filtration. The filtrate is also free of significant amounts of taurine. Because the filter cloth is hung on hook 77, it can be removed and cleaned at any time. The first rolling element 710 ensures stable drum rotation. A lip portion is provided at the top of the drum's sidewall, tilted toward the center of the second opening. The filter cloth 78 is hung on hook 77, providing ample space for operation. Two handles 732 allow for quick removal of drum 73 filled with solids and replacement of the drum for solid-liquid separation, enabling continuous operation. This method solves the problem of high-efficiency solid-liquid separation in the prior art, where overnight pore clogging and continuous operation are difficult.
[0060] like Figure 5 As shown, the concentration kettle 1 is provided with a first temperature measuring device 111 , a first pressure measuring device 112 , a first stirring device 113 , and a first pressure relief valve 114 .
[0061] like Figure 2 As shown, the crystallization kettle 2 is provided with a second temperature measuring device 25, a second pressure measuring device 26, and a second stirring device 27. The first chilled brine outlet pipe 24 is provided with a first Y-type filter 28.
[0062] like Figure 4As shown, a second Y-type filter 29 is provided on the second chilled brine outlet pipe 83 .
[0063] like Figure 6 As shown, a liquid level gauge 94 is provided on the temporary storage tank 9. The membrane filtration device 51 is externally connected to a clear water tank.
[0064] During evaporation, the pressure in the concentration tank 1 is maintained at -0.2 atmospheres by the first vacuum pump 10. The evaporation temperature is controlled at 60°C. The material in the concentration tank 1 is discharged through the hose 20. When the supersaturation of the material in the concentration tank 1 reaches 1.05, evaporation is stopped.
[0065] As the material in the crystallizer 2 cools and crystallizes, sulfuric acid is injected into the crystallizer 2 through the hose 107. The pH value of the material in the crystallizer 2 is 5, and the material temperature is cooled to 5°C. A pH measuring device is provided to control the concentration of sulfate ions to ensure that ammonium ions are fully absorbed to form ammonium sulfate during the cooling and crystallization of the material. The solid obtained by the centrifuge 7 is mainly ammonium salt crystals composed mainly of ammonium sulfate.
[0066] The taurine wastewater is fed into the concentration kettle 1 from the feed pipe 40, and the concentration kettle 1 is heated. The generated steam is separated into gas and liquid in the gas-liquid separator device 6, and the liquid flows back into the concentration kettle 1. The steam then enters the condenser 8 for condensation, and the generated condensed water is temporarily stored in the temporary storage tank 9. The volatilized gas passes through the vacuum device 91 and enters the tail gas absorption tower 92 for absorption and treatment, and is discharged in compliance with the emission standards.
[0067] When the temporary storage tank 9 is full, the drain valve 93 and the first valve 46 are opened, allowing the condensed water to flow into the collection tank 3. The liquid from the concentrator 1 enters the crystallizer 2 for cooling and crystallization. Finally, the crystallized material is fed into the centrifuge 7 for solid-liquid separation. The resulting liquid is then fed into the collection tank 3. The liquid from the collection tank 3 is fed into the heater 50 and heated to 40°C. It is then fed into the electrodialysis unit 5, where the concentrate outlet 52 of the electrodialysis unit 5 aligns with the material inlet at the top of the concentrator 1 for further concentration. Because the liquid entering the electrodialysis unit 5 is relatively hot, the increased temperature increases the ion transport rate within the water, while also reducing the resistance between the membrane and the solution. This increases the amount of salt removed, increases the desalination rate, and improves the quality of the freshwater. In this embodiment, the evaporation temperature is controlled at 60°C. Common industrial steam retains residual heat after heating, which is not fully utilized. Because the heater 50 utilizes the steam from the first heating unit on the concentrator 1, the residual heat of the steam from the first heating unit is effectively utilized. The temperature of the concentrated liquid at the concentrate outlet 52 of the electrodialysis unit 5 is already elevated before it enters the concentration kettle 1, so evaporation within the concentration kettle 1 is more energy-efficient. Similarly, a second refrigeration unit is provided on the condenser 8, and the chilled brine inlet of the second refrigeration unit is connected to the chilled brine outlet of the first refrigeration unit. This allows the residual heat of the chilled brine in the first refrigeration unit to be fully utilized for cooling, which is more energy-efficient. The present invention continuously crystallizes the salts in the wastewater. The entire treatment process is primarily physical, and no new impurities are introduced into the system. The entire treatment process is continuous, fast, and relatively low in cost.
[0068] Example 2, as Figure 12-13 As shown, this embodiment differs from Example 1 in that an acid tank 417 and an alkali tank 418 are provided on the twelfth pipeline 414. This technical solution removes ammonia and sulfur dioxide from the volatile gases in the temporary storage tank. During evaporation, the pressure within the concentration tank 1 is maintained at -0.1 atmospheres by the first vacuum pump 10. The evaporation temperature is controlled at 50°C. The material within the concentration tank 1 is discharged through the hose 20. Evaporation ceases when the supersaturation of the material within the concentration tank 1 reaches 1.15.
[0069] As the material in the crystallizer 2 cools and crystallizes, sulfuric acid is injected into the crystallizer 2 through the hose 107. The pH value of the material in the crystallizer 2 is 6, and the material temperature is cooled to 10°C. A pH measuring device is provided to control the concentration of sulfate ions to ensure that ammonium ions are fully absorbed to form ammonium sulfate during the cooling and crystallization of the material. The solid obtained by the centrifuge 7 is mainly ammonium salt crystals composed mainly of ammonium sulfate.
Claims
1. A taurine waste liquid continuous treatment system, characterized by: The invention comprises a concentration kettle (1), wherein the concentration kettle (1) is connected to the feed port at the top of the crystallization kettle (2); the bottom of the crystallization kettle (2) is connected to a centrifuge (7), the liquid outlet of the centrifuge (7) is connected to a collection tank (3), and the collection tank (3) is connected to a heater (50); the heater (50) is connected to the liquid inlet of the electrodialysis device (5) through a pipeline, and a liquid pump (45) is provided on the pipeline (44); the concentrated liquid outlet (52) of the electrodialysis device (5) is connected to the material inlet at the top of the concentration kettle (1); the fresh water outlet (53) of the electrodialysis device (5) is connected to a membrane filtration device (51), and the membrane filtration device (51) is externally connected to a clear water tank; the top of the concentration kettle (1) is connected to a gas-liquid separator device (6) through a first vacuum pump (10), and the gas-liquid separator device (6) is connected to the concentration kettle (1); a plurality of pH measuring devices ( 101), the top of the crystallization kettle (2) is connected to the sulfuric acid tank (102); the top outlet of the gas-liquid separator device (6) is connected to the condenser (8), the condenser (8) is connected to the top of the temporary storage tank (9), the top outlet of the temporary storage tank (9) is connected to the vacuum device (91), and the vacuum device (91) is connected to the tail gas absorption tower (92); the top of the temporary storage tank (9) is provided with a vent valve (93); the temporary storage tank (9) is connected to the clear water tank through a pipeline and the pipeline is provided with a first valve (46); the concentration kettle (1) is provided with a first heating device, the heater (50) is provided with a second heating device, the steam inlet of the second heating device is connected to the steam outlet of the first heating device; the concentration kettle (1) is provided with a first refrigeration device, the condenser (8) is provided with a second refrigeration device, and the frozen brine inlet of the second refrigeration device is connected to the frozen brine outlet of the first refrigeration device.
2. The continuous taurine waste liquid treatment system according to claim 1, wherein: The first heating device comprises a first jacket (11) arranged on the outer peripheral surface of the concentration kettle (1); a first heating coil (12) is arranged in the first jacket (11), and the inlet of the first heating coil (12) is connected to the steam inlet pipe (13); the steam outlet of the first heating device is the outlet of the first heating coil (12); the outlet of the first heating coil (12) is connected to the first steam outlet pipe (14); The second heating device includes a second jacket (54) provided on the outer peripheral surface of the heater (50), a second heating coil (55) being provided in the second jacket (54), a steam inlet of the second heating device being the inlet of the second heating coil (55); the inlet of the second heating coil (55) being connected to the first steam outlet pipe (14); and the outlet of the second heating coil (55) being connected to the second steam outlet pipe (56); The first refrigeration device comprises a third jacket (21) arranged on the outer peripheral surface of the crystallization kettle (2); a first refrigeration coil (22) is arranged in the third jacket (21), and the inlet of the first refrigeration coil (22) is connected to the chilled brine inlet pipe (23); the chilled brine outlet of the first refrigeration device is the outlet of the first refrigeration coil (22), and the outlet of the first refrigeration coil (22) is connected to the first chilled brine outlet pipe (24); The second chilled brine heating device comprises a fourth jacket (81) arranged on the outer peripheral surface of the condenser (8), a second refrigeration coil (82) is arranged in the fourth jacket (81), a chilled brine inlet of the second refrigeration device is the inlet of the second refrigeration coil (82), the inlet of the second refrigeration coil (82) is connected to the first chilled brine outlet pipe (24), and the outlet of the second refrigeration coil (82) is connected to the second chilled brine outlet pipe (83).
3. The continuous taurine waste liquid treatment system according to claim 2, wherein: A three-way valve (15) is provided on the steam inlet pipe (13), and the three-way valve (15) is connected to the bottom end of the crystallization kettle (2) through a steam branch pipe (16); a first stop valve (18) is provided on the side of the three-way valve (15) on the steam inlet pipe (13) close to the crystallization kettle (2); and a second stop valve (17) is provided on the side of the three-way valve (15) on the steam inlet pipe (13) away from the crystallization kettle (2).
4. The continuous taurine waste liquid treatment system according to claim 3, wherein: The first stop valve (18) on the steam inlet pipe (13) is close to the crystallization kettle (2), and the second stop valve (17) on the steam inlet pipe (13) is far from the crystallization kettle (2) and is connected to the bypass pipe (19). The bypass pipe (19) is provided with a third stop valve (110).
5. The continuous taurine waste liquid treatment system according to claim 1, wherein: The top of the concentration kettle (1) is connected to the feed pipe (40), and the concentration kettle (1) is connected to the feed port at the top of the crystallization kettle (2) through a first pipeline (41); the bottom of the crystallization kettle (2) is connected to the centrifuge (7) through a hose (20), the liquid outlet of the centrifuge (7) is connected to the collection tank (3) through a second pipeline (42), and the collection tank (3) is connected to the heater (50) through a third pipeline (43); the heater (50) is connected to the liquid inlet of the electrodialysis device (5) through a fourth pipeline (44); a liquid pump (45) is provided on the fourth pipeline (44); the temporary storage tank (9) is connected to the clean water tank through a fifth pipeline (45); and a first valve (46) is provided on the fifth pipeline (45); The concentrated liquid outlet (52) of the electrodialysis device (5) is connected to the top of the concentration kettle (1) through the thirteenth pipeline (47); the fresh water outlet (53) of the electrodialysis device (5) is connected to the membrane filtration device (51) through the sixth pipeline (48); The top of the concentration kettle (1) is connected to the middle of the gas-liquid separator device (6) via a seventh pipeline (49), and the first vacuum pump (10) is arranged on the seventh pipeline (49); the liquid outlet at the bottom of the gas-liquid separator device (6) is connected to the concentration kettle (1) via an eighth pipeline (410); The top gas outlet of the gas-liquid separator device (6) is connected to the condenser (8) through the ninth pipeline (411), the condenser (8) is connected to the top of the temporary storage tank (9) through the tenth pipeline (412), the top gas outlet of the temporary storage tank (9) is connected to the vacuum device (91) through the eleventh pipeline (413), and the vacuum device (91) is connected to the tail gas absorption tower (92) through the twelfth pipeline (414).
6. The continuous taurine waste liquid treatment system according to claim 5, characterized in that: A first filter (415) is provided on the fifth pipeline (45); and a second filter (416) is provided on the second pipeline (42).
7. The continuous taurine waste liquid treatment system according to claim 5, characterized in that: A plurality of pH measuring devices (101) are provided on the inner wall of the crystallization kettle (2); the top of the crystallization kettle (2) is connected to the sulfuric acid tank (102) via a hose (107), and the hose (107) is provided with an injection pump (103) and a first stop valve (104); the pH measuring device (101) is connected to a display (106) provided on the top surface of the crystallization kettle (2) via a line (105).
8. The continuous taurine waste liquid treatment system according to claim 5, characterized in that: The vacuum device (91) includes a second vacuum pump (910), a vacuum buffer tank (911), and a high-pressure airflow nozzle (912). The eleventh pipeline (413) is connected to the vacuum buffer tank (911), the vacuum buffer tank (911) is connected to the second vacuum pump (910), the second vacuum pump (910) is connected to the high-pressure airflow nozzle (912), and the high-pressure airflow nozzle (912) is connected to the twelfth pipeline (414).
9. The continuous taurine waste liquid treatment system according to claim 5, characterized in that: An acid tank (417) and an alkali tank (418) are provided on the twelfth pipeline (414).
10. The continuous taurine waste liquid treatment system according to claim 1, characterized in that: The centrifuge comprises a frame (71), a fixed drum (72) vertically fixed to the frame (71) and having a first opening (714) at its top, and a rotating drum (73) vertically arranged in the fixed drum (72); a plurality of liquid-spinning holes (713) are arranged on the peripheral side wall of the rotating drum (73); a second opening (715) is arranged at the top of the rotating drum (73); a rotating shaft mounting hole is vertically provided at the center of the bottom surface of the fixed drum (72), and a rotating shaft (74) is mounted on the rotating shaft mounting hole; the rotating shaft (74) is connected to a motor (75) arranged on the frame (71); A drum lip portion (76) is provided at the top of the peripheral wall of the rotating drum (73) and is inclined toward the center of the second opening (715). The outer peripheral surface of the drum lip portion (76) is provided with a plurality of hooks (77) in a ring array along the central axis of the rotating shaft (74). A plurality of filter cloth pieces (78) are provided in the rotating drum (73). A hanging ring (79) is provided at the top of each filter cloth piece (78). Each hanging ring (79) is connected to a hook (77). The height of each filter cloth piece (78) is greater than the height of the peripheral wall of the rotating drum (73). A plurality of rolling body mounting seats (711) are provided in a ring array on the inner peripheral side surface of the top of the peripheral wall of the fixed drum (72). A rolling body (710) is mounted on each rolling body mounting seat (711). The rolling body (710) contacts the outer peripheral surface of the peripheral wall of the rotating drum (73). A liquid outlet (712) is provided at the bottom end of the fixed drum (72). The bottom end of the hose (20) is located above the second opening (715). The bottom surface of the rotating drum (73) is provided with a slot (731) opening downward, the horizontal cross-section of the slot (731) is polygonal, and the top end of the rotating shaft is adapted to the polygon and can be inserted into the slot (731); two handles (732) are vertically provided at the top end of the rotating drum (73), and the central axes of the two handles (732) pass through the central axis of the rotating shaft (74).