A method and device for treating carbon black wastewater

Abstract

This invention belongs to the field of petrochemical carbon black wastewater treatment technology, specifically relating to a method and apparatus for treating carbon black wastewater, including the following steps: Step S10: Neutralizing activated wastewater by adding acid, mainly concentrated sulfuric acid, using the activated water collection tank of the chemical workshop to obtain neutralized activated wastewater; Step S20: Filtering carbon black wastewater from the acetylene workshop to obtain filtrate, then pumping the filtrate and neutralized activated wastewater in a certain proportion into an integrated water purifier, where the two streams react, separate, filter, and settle to obtain supernatant; Step S30: Pumping the supernatant into a sedimentation tank for solid-liquid separation to obtain circulating water makeup. This solution solves the problem of requiring large amounts of flocculant for treating carbon black wastewater.

Description

Technical Field

[0001] This invention belongs to the field of petrochemical carbon black wastewater treatment technology, specifically relating to a carbon black wastewater treatment method and treatment device. Background Technology

[0002] The main process for producing 1,4-butanediol (BDO) is the "acetylene-aldehyde process for BDO production." The most crucial step involves hydrogenating butynediol (BYD) in a hydrogenation reactor using a catalyst to produce 1,4-butanediol (BDO). The nickel-aluminum catalyst used requires activation with sodium hydroxide solution before use. Sodium hydroxide reacts with the aluminum in the catalyst to form sodium aluminate, increasing the porosity and surface area of ​​the nickel-aluminum catalyst, thus facilitating the reaction with BYD. This process involves an acetylene workshop and an activation workshop, both of which discharge activation wastewater and carbon black wastewater that cannot be treated. The chemical plant discharges activation wastewater 24 times a year, requiring 15 tons of concentrated sulfuric acid for neutralization each time, resulting in an annual discharge of approximately 49,000 m³ of activation wastewater. 3 The sewage discharge fee is 93,100 yuan. Furthermore, during the acid addition process, a large amount of white flocculent matter is generated in the originally clear water (due to the reaction of sodium aluminate in the water with acid, forming aluminum hydroxide precipitate). This precipitate must be left to stand for a period of time until it settles to the bottom of the tank before the supernatant can be slowly discharged to the main discharge outlet (the park's environmental monitoring point) to prevent the flocculent sediment from causing the park's total discharge to exceed standards. The long-term deposition of aluminum hydroxide impurities at the bottom of the tank reduces the effective volume of the collection tank, easily leading to the discharge of flocculent matter and causing suspended solids in the total wastewater to exceed standards. This has always been a major concern affecting the qualified operation of the wastewater treatment plant. Therefore, from both an economic perspective and in terms of solving on-site production problems, a new solution for activated wastewater urgently needs to be found.

[0003] A current precipitated process for treating precipitated silica wastewater (publication number CN116332430A) includes the following steps: S1, injecting the raw precipitated silica wastewater into a buffer tank and adding flocculant for buffering, allowing impurities and suspended solids in the wastewater to settle; S2, injecting the buffered wastewater into a filter press for filtration, further separating the solids and liquids through filtration, recovering the separated liquid, and reusing the separated solid silica sludge cake; S3, evaporating the liquid generated in step S2 through a pre-evaporator, recovering the condensate generated during evaporation, and collecting the remaining product after evaporation. The advantages are: the multi-stage evaporation and concentration process for wastewater treatment not only greatly reduces the pollution of the wastewater, but also ensures strong process continuity, simple operation, and high extraction rate of recovered materials, significantly improving treatment efficiency.

[0004] However, there is also a problem: this solution requires a large amount of flocculant, which wastes resources. Summary of the Invention

[0005] This solution provides a method for treating carbon black wastewater, which addresses the problem of requiring large amounts of flocculant for treating carbon black wastewater.

[0006] This solution provides a method for treating carbon black wastewater, including the following steps:

[0007] Step S10: Neutralize the activated wastewater by adding acid, mainly concentrated sulfuric acid, using the activated water collection tank in the chemical workshop to obtain neutralized activated wastewater;

[0008] Step S20: Filter the carbon black wastewater from the acetylene workshop to obtain filtrate. Then, pump the filtrate and neutralized activation wastewater into an integrated water purifier in a certain ratio. The two streams of water react, separate, filter, and settle in the high-efficiency integrated water purifier to obtain supernatant.

[0009] Step S30: Pump the supernatant into the sedimentation tank for solid-liquid separation to obtain circulating water makeup.

[0010] The beneficial effects of this solution are as follows: the activated wastewater is actually alkaline pure water, with its main component being NaAlO. 2， This method utilizes activated wastewater from a chemical plant, neutralizing it with acid to obtain the main components of a flocculant, which is then mixed with carbon black wastewater for flocculation. This approach converts activated wastewater into flocculant, saving on flocculant and improving efficiency by treating both types of wastewater simultaneously.

[0011] Furthermore, the process includes step S40: pumping the circulating water makeup water to the greywater membrane unit to produce soft water. The greywater membrane unit can convert the circulating water makeup water into soft water, thereby improving water quality.

[0012] Furthermore, the greywater membrane unit in step S40 includes a multi-media filter, an ultrafiltration system, and a reverse osmosis (RO) system. The circulating water makeup water first passes through the multi-media filter, then through the ultrafiltration system, and finally is pumped to the RO system. The RO water that passes the RO test is used as soft water, while the unqualified water is used as circulating water makeup water. The circulating water makeup water enters the multi-media filter. After filtration, the qualified permeate water with a turbidity ≤3 NTU enters the ultrafiltration (UF) device (whether to use a membrane element with reinforcing ribs depends on the water quality). The ultrafiltration permeate water enters the ultrafiltration permeate tank, where residual chlorine and other parameters are monitored. After the ultrafiltration permeate water passes the test, it is pumped to the RO device (whether to use a special RO device with a special aeration backwashing design depends on the water quality). The RO permeate water that passes the test enters the soft water tank for use as soft water; otherwise, it is used as circulating water makeup water. The concentrated water (approximately 50 m³ / h) produced by the greywater membrane system is discharged into the biological treatment system. This method effectively converts circulating water makeup water into soft water.

[0013] Furthermore, in step S20, the ratio of the filtrate to the neutralized and activated wastewater is 10:1. This ratio can achieve a good flocculation effect.

[0014] Furthermore, if the activated wastewater in step S10 is insufficient, it can be replaced with PAC, with a PAC dosage of 50 mg / L.

[0015] This solution also provides a carbon black wastewater treatment device comprising: a wastewater treatment plant for collecting and simply treating activated wastewater and carbon black wastewater; an integrated purifier for reacting, stratifying, filtering, and settling the activated wastewater and carbon black wastewater; a sedimentation tank for settling the filtered supernatant; a multi-media filter for filtering microorganisms and some dissolved organic matter; an ultrafiltration (UF) device for removing bacteria and viruses; an ultrafiltration permeate tank for monitoring water quality; and a reverse osmosis (RO) device for screening soft water. The wastewater treatment plant, integrated purifier, sedimentation tank, multi-media filter, ultrafiltration (UF) device, ultrafiltration permeate tank, and reverse osmosis (RO) device are connected in sequence.

[0016] The wastewater treatment plant collects activated wastewater and carbon black wastewater. The activated wastewater is then neutralized, and the carbon black wastewater is filtered. The filtrate is pumped to an integrated water purifier. Simultaneously, the neutralized activated wastewater is pumped to the PAC dosing inlet line of the integrated water purifier. Using the integrated water purifier's dosing system, the activated wastewater and carbon black wastewater are thoroughly mixed in a specific ratio. The two streams then react, separate, filter, and settle in the high-efficiency integrated water purifier. The treated, qualified reclaimed water (turbidity ≤20 NTU) enters the sedimentation tank. After solid-liquid separation, the supernatant overflows to the effluent compartment. The product water from the effluent compartment is used as makeup water for the circulating system.

[0017] The circulating water makeup water first enters a multi-media filter. After filtration, qualified product water with a turbidity ≤3 NTU enters the ultrafiltration (UF) unit. The ultrafiltration product water then enters the ultrafiltration product water tank, where residual chlorine and other parameters are monitored. After the ultrafiltration product water passes the test, it is pumped to the reverse osmosis (RO) unit. The reverse osmosis product water, after passing the test, enters the soft water tank for use as soft water. If it does not meet the soft water standards, it is used as circulating water makeup water. This device can convert circulating water makeup water into soft water.

[0018] Furthermore, the sedimentation tank includes a tank body, a guide rail, an overflow trough, a water pump, a drive source, a connecting rod, a sludge scraper, and a controller. The tank body is equipped with an inlet pipe and a sedimentation tank. The inlet pipe is equipped with a liquid distributor. The guide rail is fixedly connected to the tank body. The drive source is slidably connected to the guide rail. One end of the connecting rod is fixedly connected to the drive source, and the other end is fixedly connected to the sludge scraper. The sludge scraper cooperates with the bottom of the tank body and also cooperates with the sedimentation tank. The overflow trough is fixedly connected to the tank body. The controller is electrically connected to the drive source.

[0019] The inlet pipe is located at the top of the sedimentation tank. The supernatant enters the sedimentation tank through this pipe, flowing at a certain speed. After passing through a liquid distributor, the supernatant is evenly distributed throughout the tank, preventing short-circuiting caused by a high flow rate only in the inlet pipe and a low flow rate elsewhere. Once in the sedimentation tank, gravity causes solids to settle, while the liquid flows forward at a stable velocity and then exits through the overflow trough. The controller activates the drive unit at set intervals, causing the drive unit to move a linkage on a guide rail, which in turn moves the sludge scraper. The sludge scraper scrapes the fixed particles settled at the bottom into the sedimentation tank. When cleaning is needed, only the sedimentation tank needs to be cleaned, facilitating the removal of sediment from the bottom by staff.

[0020] Furthermore, it also includes a sludge removal mechanism, which includes a baffle plate, a spring, and a scraper. The baffle plate is slidably connected to the pool body and cooperates with the sedimentation tank. The baffle plate is made of ferromagnetic material. The sludge removal shovel is equipped with a magnet, which cooperates with the baffle plate. One end of the spring is fixedly connected to the baffle plate, and the other end is fixedly connected to the pool body. The scraper is fixedly connected to the baffle plate and cooperates with the bottom of the sedimentation tank. The sedimentation tank is equipped with an electric valve for sludge removal, and the electric valve is electrically connected to a controller.

[0021] During solid-liquid separation in sedimentation tanks, solid particles remain inside the tank, and long-term accumulation can easily cause secondary pollution. Existing equipment involves scraping sludge into the sedimentation tank using a sludge scraper and then cleaning the tank periodically. This approach has several problems: 1. The sludge remains inside the sedimentation tank after entering, which can easily cause secondary pollution if not manually cleaned. 2. Manually cleaning the sedimentation tank is very troublesome. 3. Cleaning the existing sedimentation tank requires shutting it down, which is very time-consuming and reduces efficiency.

[0022] This solution uses a controller to start the drive source, causing the sludge shovel to move. At this point, the magnet on the sludge shovel contacts the baffle plate. The movement of the sludge shovel moves the baffle plate, opening the sedimentation tank and allowing sludge to fall into it. After sludge removal, the sludge shovel retracts, causing the magnet to move the baffle plate, which in turn moves the scraper. When the baffle plate closes the sedimentation tank, the controller opens the electric valve, and the scraper removes the sludge from the tank. When the sludge shovel retracts to the set position, the magnet disconnects from the baffle plate, which then returns to its initial position under spring pressure. Simultaneously, the controller closes the electric valve.

[0023] This solution achieves automatic cleaning and sludge removal from the sedimentation tank through a sludge removal mechanism, preventing secondary pollution. Furthermore, full automation reduces labor costs. The mechanism can also clean the sedimentation tank while it is in operation, improving efficiency.

[0024] Furthermore, the connecting rod is equipped with a cleaning rod for cleaning the inlet of the liquid distributor, and the cleaning rod cooperates with the inlet of the liquid distributor. When the sludge shovel moves to the sedimentation tank, the cleaning rod on the connecting rod inserts into the inlet of the liquid distributor to clear any blockages. When the sludge shovel retracts, the cleaning rod is removed from the liquid distributor. This mechanism allows for periodic cleaning of the liquid distributor, preventing blockage of the inlet and avoiding uneven flow rates.

[0025] Furthermore, a push-button switch is included to control the opening and closing of the electric valve. The push-button switch is electrically connected to the controller and is located near the electric valve in the sedimentation tank. The push-button switch is press-triggered; one press opens the valve, and another press closes it. When the baffle moves to the right with the magnet until it closes the sedimentation tank, the scraper also moves to the position of the push-button switch, triggering it and opening the electric valve. The baffle continues to move to the right, causing the scraper to move as well, discharging sludge from the sedimentation tank. When the magnet exceeds its adsorption strength, the baffle disconnects from the magnet, and the baffle and scraper return to their original positions under the action of the spring. The scraper then touches the push-button switch again, causing the controller to close the electric valve, preventing leakage from the sedimentation tank. Attached Figure Description

[0026] Figure 1 This is a flowchart of a carbon black wastewater treatment method.

[0027] Figure 2 This diagram shows the state of a sludge shovel moving to the right in the sedimentation tank of a carbon black wastewater treatment device.

[0028] Figure 3 This is a diagram showing the state of a sludge shovel moving to the left in the sedimentation tank of a carbon black wastewater treatment device.

[0029] The reference numerals in the accompanying drawings include: 1. Pool body; 2. Guide rail; 3. Overflow trough; 4. Inlet pipe; 5. Drive source; 6. Cleaning rod; 7. Connecting rod; 8. Sludge scraper; 9. Liquid distributor; 10. Baffle plate; 11. Spring; 12. Sedimentation tank; 13. Press switch; 14. Scraper; 15. Electric valve; 16. Magnet. Detailed Implementation

[0030] The basics are as follows: Figure 1 As shown:

[0031] The carbon black slurry produced during the natural gas to acetylene production process is cooled and discharged after 99% of the carbon black is removed by a scraper in the wastewater treatment plant. The resulting black water, with suspended solids ≥1000mg / L, is then filtered to produce carbon black wastewater (50mg / L < suspended solids <100mg / L).

[0032] In the process of producing BDO by the acetylacetaldehyde method, the "activated wastewater" generated by catalyst activation is alkaline wastewater (pH value > 11), containing a large amount of aluminate ions, COD (chemical oxygen demand) < 20 mg / L, and containing a small amount of zinc, nickel and other ions. Due to the adsorption and flocculation properties of aluminate, the suspended solids in the wastewater are ≥ 1000 mg / L during the discharge process, resulting in a white milky liquid.

[0033] Table 1: Water Quality of Activated Wastewater

[0034]

[0035] Table 2: Water Quality of Carbon Black Wastewater

[0036]

[0037] Both carbon black wastewater and activation wastewater are discharged into the wastewater treatment plant. The pretreatment process of this invention uses activation wastewater as a treatment agent for carbon black wastewater. This utilizes the adsorption and flocculation effects of activation wastewater, and because the volume of activation wastewater is less than that of carbon black wastewater, PAC can be used as a substitute if the activation wastewater runs out. The specific formula is as follows: activation water and carbon black wastewater are mixed in a 1:10 ratio. The coagulation effect is best at pH=9, and the turbidity can be reduced to below 1 NTU. When activation wastewater is unavailable, the treatment of carbon black wastewater requires a PAC dosage of 50 mg / L and a PAM dosage of 20 mg / L. The turbidity removal effect is best when the pH is adjusted to 10, and the turbidity of the supernatant is <1 NTU.

[0038] The main equipment of the pretreatment device of the present invention is an "integrated water purifier" abandoned by the sewage treatment plant. It is a water tank that integrates coagulation, flocculation, sedimentation and sludge discharge, and occupies an area of ​​￠6×10m. It was put back into use after being repaired and a new chemical system was added.

[0039] The membrane system processing unit of this invention comprises two multi-media filter tanks (100 m³ / h each) + two ultrafiltration units (100 m³ / h each) + two reverse osmosis units (100 m³ / h each). Both the ultrafiltration and reverse osmosis membranes are existing membranes.

[0040] This solution provides a method for treating carbon black wastewater, including the following steps:

[0041] 1. Preprocessing:

[0042] Activated wastewater: The activated wastewater is neutralized by adding acid, mainly concentrated sulfuric acid, to adjust the pH value to 9-10 using the existing activated water collection tank.

[0043] Carbon black wastewater: It is first treated by the existing carbon black wastewater treatment device, and the supernatant after treatment is discharged to the product water tank of the existing carbon black wastewater treatment device.

[0044] 2. Secondary Filtration: The carbon black water in the existing carbon black water tank is pumped to the integrated water purifier B (using the existing equipment). Simultaneously, the neutralized activation wastewater is also pumped to the PAC dosing inlet line of the integrated water purifier B. Using the integrated water purifier's dosing system, the activation wastewater and carbon black wastewater are thoroughly mixed in a specific ratio. Then, the two streams react, separate, filter, and settle in the high-efficiency integrated water purifier. The filtered supernatant with a turbidity ≤20 NTU can flow into the sedimentation tank. When the activation wastewater is insufficient, PAC can be added as a substitute. The filtered impurities are discharged from the water body through the integrated water purifier's sludge removal device.

[0045] 3. Sedimentation Tank (New Reclaimed Water Collection Tank): The treated and qualified reclaimed water (turbidity ≤ 20 NTU) enters the inlet pipe 4 of the sedimentation tank. After gravity solid-liquid separation, the supernatant overflows to the outlet tank. The product water from the outlet tank is used as makeup water for the circulating system, or pumped to the next treatment unit—the greywater membrane unit—to produce soft water.

[0046] Water samples are monitored at the product water outlet, with the main water quality indicators being pH, turbidity, conductivity, and COD.

[0047] 4. New dual-membrane greywater system: Qualified reclaimed water is pumped to the new greywater unit. It first enters a multi-media filter; after filtration, the qualified permeate with turbidity ≤3 NTU enters an ultrafiltration (UF) unit (whether to use a reinforced membrane element depends on the water quality). The ultrafiltration permeate enters an ultrafiltration permeate tank, where residual chlorine and other parameters are monitored. After the ultrafiltration permeate passes inspection, it is pumped to a reverse osmosis (RO) unit (whether to use a special RO unit with a special aeration backwashing design depends on the water quality). The RO permeate, after passing inspection, enters a soft water tank for use as soft water; if it does not meet the soft water standards, it is used as makeup water for the circulating system. The concentrated water (approximately 50 m³ / h) produced by the greywater membrane system is discharged into the biological treatment system.

[0048] Beneficial effects: 1. This method can recycle and reuse unusable BDO activation wastewater and carbon black wastewater, reducing wastewater discharge.

[0049] 2. Removal of impurities from carbon black wastewater: The suspended solids (SS) in carbon black wastewater is reduced from 50-100 mg / L to below 20 mg / L (turbidity < 20 NTU), and it can be used as makeup water for circulating water.

[0050] 3. Wastewater reuse: The two types of wastewater that are currently difficult to utilize are treated to industrial water quality and then recycled.

[0051] This solution also provides a carbon black wastewater treatment device, including a wastewater treatment plant, an integrated purifier, a sedimentation tank, a multi-media filter, an ultrafiltration (UF) device, an ultrafiltration permeate tank, and a reverse osmosis (RO) device.

[0052] The wastewater treatment plant is used to collect and perform basic treatment of activated wastewater and carbon black wastewater. The filtration of carbon black wastewater and the neutralization of activated wastewater are both completed within this unit. An integrated purifier is used for the reaction, stratification, filtration, and sedimentation of activated wastewater and carbon black wastewater.

[0053] The basics are as follows: Figure 2 , Figure 3 As shown:

[0054] The sedimentation tank is used to settle and filter the supernatant. The sedimentation tank includes a tank body 1, a guide rail 2, an overflow trough 3, a water pump, a drive source 5, a connecting rod 7, a sludge scraper 8, and a controller. The tank body 1 is equipped with an inlet pipe 4 and a sedimentation tank 12. The inlet pipe 4 is equipped with a liquid distributor 9. The guide rail 2 is fixedly connected to the tank body 1, and the drive source 5 is slidably connected to the guide rail 2. One end of the connecting rod 7 is fixedly connected to the drive source 5, and the other end is fixedly connected to the sludge scraper 8. The sludge scraper 8 contacts the bottom of the tank body 1, so that when the sludge scraper 8 moves, it can carry away the sludge at the bottom of the tank body 1. When the sludge scraper 8 moves to the left, it can scrape the sludge into the sedimentation tank 12. The sedimentation tank 12 is located in the lower left corner. The overflow trough 3 is fixedly connected to the tank body 1, and the controller is electrically connected to the drive source 5.

[0055] The system also includes a sludge removal mechanism, which comprises a baffle plate 10, a spring 11, and a scraper 14. The baffle plate 10 is slidably connected to the tank body 1 and is closed under the action of the spring 11, covering the sedimentation tank 12 and separating it from the tank body 1. When the sludge removal shovel 8 moves over, it pushes the baffle plate 10 open, connecting the sedimentation tank 12 to the tank body 1. The baffle plate 10 is made of iron, and the sludge removal shovel 8 is equipped with a magnet 16 that cooperates with the baffle plate 10. One end of the spring 11 is fixedly connected to the baffle plate 10, and the other end is fixedly connected to the tank body 1. The scraper 14 is fixedly connected to the baffle plate 10 and contacts the bottom of the sedimentation tank 12. When the scraper 14 moves, it can scrape the sludge in the sedimentation tank 12. The sedimentation tank 12 is equipped with an electric valve 15 for sludge removal, which is electrically connected to a controller. The connecting rod 7 is provided with a cleaning rod 6 for cleaning the water inlet of the liquid distributor 9. The number of cleaning rods 6 is the same as the number of water inlet holes of the liquid distributor 9, and the diameter of the cleaning rod 6 is slightly smaller than that of the water inlet hole.

[0056] The multi-media filter filters microorganisms and some dissolved organic matter; the ultrafiltration (UF) device is used to remove bacteria and viruses; the ultrafiltration permeate tank monitors water quality; the reverse osmosis (RO) device is used to screen soft water; the wastewater treatment plant, integrated purifier, sedimentation tank, multi-media filter, ultrafiltration (UF) device, ultrafiltration permeate tank, and reverse osmosis (RO) device are connected in sequence.

[0057] The operating principle of the sedimentation tank is as follows: The inlet pipe 4 is located at the top of the sedimentation tank. The supernatant enters the sedimentation tank through the inlet pipe 4, flowing into the tank at a certain speed. After passing through the liquid distributor 9, the supernatant is evenly distributed throughout the sedimentation tank, preventing short-circuiting caused by a high flow rate only in the inlet pipe 4 and a low flow rate elsewhere. After entering the sedimentation tank, the supernatant undergoes sedimentation due to gravity, while the liquid flows forward at a stable velocity and then exits through the overflow trough 3. The controller controls the drive source 5 to operate at set intervals. When the controller starts the drive source 5, it causes the sludge scraper 8 to move. At this time, the magnet 16 on the sludge scraper 8 contacts the baffle plate 10. The movement of the sludge scraper 8 moves the baffle plate 10, opening the sedimentation tank 12 and allowing the sludge to fall into it, completing the sludge removal process. When the sludge scraper 8 moves to the sedimentation tank 12, the cleaning rod 6 on the connecting rod 7 inserts into the inlet hole of the liquid distributor 9 to clear any blockages. When the sludge scraper 8 retracts, the cleaning rod 6 is removed from the liquid distributor 9. This mechanism allows for periodic cleaning of the liquid distributor 9, preventing blockages in the inlet hole and ensuring even flow rates. The system also includes a push-button switch 13, which controls the opening and closing of the electric valve 15. The push-button switch 13 is electrically connected to the controller and is located in the sedimentation tank 12 near the electric valve 15. The push-button switch 13 is press-triggered; one press opens the valve, and another press closes it.

[0058] After sludge removal is complete, the sludge removal shovel 8 will retract. At this time, the magnet 16 will move the baffle plate 10, which in turn will move the scraper 14. When the baffle plate 10 closes the sedimentation tank 12, the scraper 14 will also move to the position of the press switch 13. The press switch 13 will be triggered, and the electric valve 15 will open. At this time, the baffle plate 10 will continue to move to the right, moving the scraper 14 to the right as well, thus removing the sludge from the sedimentation tank 12. When the magnet 16 exceeds its adsorption strength, the baffle plate 10 will disconnect from the magnet 16. The baffle plate 10 and the scraper 14 will return to their original positions under the action of the spring 11. At this time, the scraper 14 will touch the press switch 13 again, and the controller will close the electric valve 15 to prevent water leakage from the sedimentation tank 12.

[0059] The beneficial effects of the sedimentation tank are: 1. This solution achieves automatic cleaning and sludge removal of the sedimentation tank 12 through the sludge removal mechanism, preventing secondary pollution, while full automation reduces labor costs. 2. This mechanism can clean the sedimentation tank 12 while the sedimentation tank is in operation, improving efficiency.

[0060] The above are merely embodiments of the present invention, and common knowledge regarding specific structures and characteristics is not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A method for treating carbon black wastewater, characterized in that, Includes the following steps: Step S10: Neutralize the activated wastewater with acid using the activated water collection tank in the chemical workshop; The activated wastewater is alkaline water containing NaAlO2. After neutralization with acid, the activated wastewater yields flocculant components. Step S20: Filter the carbon black wastewater from the acetylene workshop to obtain filtrate. Then, pump the filtrate and neutralized activation wastewater into an integrated water purifier in a certain ratio. The two streams of water react, separate, filter, and settle in the high-efficiency integrated water purifier to obtain supernatant. Step S30: Pump the supernatant into the sedimentation tank for solid-liquid separation to obtain circulating water makeup.

2. The method for treating carbon black wastewater according to claim 1, characterized in that, It also includes step S40: sending the circulating water makeup pump to the greywater membrane unit to produce soft water.

3. The carbon black wastewater treatment method according to claim 2, characterized in that, The greywater membrane unit in step S40 includes a multi-media filter, an ultrafiltration system, and a reverse osmosis (RO) system. The circulating water makeup water first passes through the multi-media filter, then through the ultrafiltration system, and finally is pumped to the reverse osmosis (RO) system. The reverse osmosis water that passes the test is used as soft water, and the water that fails the test is used as circulating water makeup water.

4. The method for treating carbon black wastewater according to claim 1, characterized in that, In step S20, the ratio of the filtrate to the neutralized and activated wastewater is 10:

1.

5. The method for treating carbon black wastewater according to claim 1, characterized in that, If the activated wastewater in step S10 is insufficient, PAC can be used as a substitute, with a PAC dosage of 50 mg / L.

6. A carbon black wastewater treatment device, characterized in that, Includes a wastewater treatment plant: the wastewater treatment plant is used for filtering carbon black wastewater and neutralizing activated wastewater, wherein the neutralization of activated wastewater includes neutralizing activated wastewater with acid using an activated water collection tank in the chemical workshop; The activated wastewater is alkaline water containing NaAlO2. After neutralization with acid, the activated wastewater yields flocculant components. Also includes: Integrated purifier: The integrated purifier is used for the reaction, stratification, filtration, and sedimentation of activated wastewater and carbon black wastewater; Sedimentation tank: The sedimentation tank is used to settle and filter the supernatant; Multi-media filter: The multi-media filter filters microorganisms and some dissolved organic matter; Ultrafiltration (UF) device: The ultrafiltration (UF) device is used to remove bacteria and viruses; Ultrafiltration permeate tank: The ultrafiltration permeate tank is used to monitor water quality. Reverse osmosis (RO) unit: The reverse osmosis (RO) unit is used to screen soft water; The wastewater treatment plant, integrated purifier, sedimentation tank, multi-media filter, ultrafiltration (UF) device, ultrafiltration permeate tank, and reverse osmosis (RO) device are connected in sequence.

7. The carbon black wastewater treatment device according to claim 6, characterized in that, The sedimentation tank includes a tank body (1), a guide rail (2), an overflow trough (3), a water pump, a drive source (5), a connecting rod (7), a sludge shovel (8), and a controller. The tank body (1) is provided with an inlet pipe (4) and a sedimentation tank (12). The inlet pipe (4) is provided with a liquid distributor (9). The guide rail (2) is fixedly connected to the tank body (1). The drive source (5) is slidably connected to the guide rail (2). One end of the connecting rod (7) is fixedly connected to the drive source (5), and the other end is fixedly connected to the sludge shovel (8). The sludge shovel (8) is matched with the bottom of the tank body (1) and the sludge shovel (8) is matched with the sedimentation tank (12). The overflow trough (3) is fixedly connected to the tank body (1). The controller is electrically connected to the drive source (5).

8. The carbon black wastewater treatment device according to claim 7, characterized in that, It also includes a sludge removal mechanism, which includes a baffle plate (10), a spring (11) and a scraper (14). The baffle plate (10) is slidably connected to the pool body (1). The baffle plate (10) cooperates with the sedimentation tank (12). The baffle plate (10) is made of ferromagnetic material. The sludge removal shovel (8) is equipped with a magnet (16). The magnet (16) cooperates with the baffle plate (10). One end of the spring (11) is fixedly connected to the baffle plate (10), and the other end is fixedly connected to the pool body (1). The scraper (14) is fixedly connected to the baffle plate (10), and the scraper (14) cooperates with the bottom of the sedimentation tank (12). The sedimentation tank (12) is equipped with an electric valve (15) for sludge removal. The electric valve (15) is electrically connected to the controller.

9. A carbon black wastewater treatment device according to claim 7, characterized in that, The connecting rod (7) is provided with a cleaning rod (6) for cleaning the water inlet of the liquid distributor (9), and the cleaning rod (6) is engaged with the water inlet of the liquid distributor (9).

10. A carbon black wastewater treatment device according to claim 8, characterized in that, It also includes a push switch (13), which is used to control the opening and closing of the electric valve (15). The push switch (13) is electrically connected to the controller and is located in the sedimentation tank (12) near the electric valve (15).

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