Wastewater treatment system for bronopol production

Abstract

The utility model relates to the technical field of bronopol production, in particular to a wastewater treatment system for bronopol production, which comprises flocculation equipment communicated with a wastewater conveying pipeline, a water outlet of the flocculation equipment is communicated with a neutralizing tank, a water outlet of the neutralizing tank is communicated with an adsorption tank, and a water outlet of the adsorption tank is communicated with anaerobic treatment equipment. A water outlet of the anaerobic treatment equipment is communicated with the ion exchange resin equipment, a water outlet of the ion exchange resin equipment is communicated with the reverse osmosis membrane treatment equipment, and a water outlet of the reverse osmosis membrane treatment equipment is communicated with a wastewater discharge pipeline. The wastewater treatment system is reasonable in design, effective treatment of wastewater is achieved, and pollution to the environment is reduced.

Description

Technical Field

[0001] This utility model relates to the field of bromonitrile production technology, and in particular to a wastewater treatment system for bromonitrile production. Background Technology

[0002] Brominnitrophenol is a novel bactericide and preservative, primarily used in cosmetics and leather preservation. It is also used as a bactericide in agriculture and medicine. Furthermore, it is a broad-spectrum and highly effective industrial bactericide used to prevent the growth and reproduction of bacteria and algae in papermaking, industrial circulating cooling water, metalworking lubricants, pulp, wood, coatings, and plywood, and is widely used in paper mill pulp and circulating cooling water systems. Currently, industrially, nitromethane, formaldehyde, and bromine are mainly used as raw materials. The crude brominnitrophenol is obtained through carbonyl methylation, bromination, and neutralization separation, followed by crystallization to obtain purified brominnitrophenol. However, actual production generates a large amount of wastewater, such as during aqueous phase separation after the reaction, during distillation and recrystallization of the mother liquor, and during rinsing of reaction equipment. This wastewater contains residual raw materials, products, and oil, and is corrosive; direct discharge would cause environmental pollution. Therefore, it is necessary to develop a wastewater treatment system for brominnitrophenol production to address these issues. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a wastewater treatment system for the production of bromonitrol, which effectively treats wastewater and reduces environmental pollution by addressing the shortcomings of existing technologies.

[0004] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows:

[0005] A wastewater treatment system for bromonitrile production includes a flocculation device connected to a wastewater conveying pipeline. The outlet of the flocculation device is connected to a neutralization tank, the outlet of the neutralization tank is connected to an adsorption tank, the outlet of the adsorption tank is connected to an anaerobic treatment device, the outlet of the anaerobic treatment device is connected to an ion exchange resin device, the outlet of the ion exchange resin device is connected to a reverse osmosis membrane treatment device, and the outlet of the reverse osmosis membrane treatment device is connected to a wastewater discharge pipeline.

[0006] As an improved technical solution, the flocculation device includes a main body, inside which are interconnected a first reaction chamber, a second reaction chamber, and a settling chamber; the first reaction chamber has an inlet on one side and a dosing port on the top, and the second settling chamber has a dosing port on the top; a first partition is provided between the first and second reaction chambers, and a second partition is provided between the second reaction chamber and the settling chamber; the lower part of the first partition has an outlet, and the upper part of the second partition has an outlet; the first, second, and settling chambers each have a rotating shaft inside, one end of which is connected to a motor, and multiple stirring plates are provided on the rotating shaft; the settling chamber has multiple corrugated plates inside, the bottom of the settling chamber is conical, a drain pipe is provided at the bottom of the settling chamber, and an outlet is provided on one side of the upper part of the settling chamber.

[0007] As an improved technical solution, the neutralization tank includes a tank body and a tank cover. The tank body has a water inlet on one side, a pH adjuster inlet on the top of the tank body, and a drain outlet on the lower side of the tank body. The tank body has a rotating shaft inside, one end of which is connected to a motor. The rotating shaft has multiple stirring rods, and the stirring rods have multiple triangular stirring blocks.

[0008] As an improved technical solution, the adsorption tank includes a tank body, an inlet pipe on one side of the tank body, an outlet pipe on the other side of the tank body, and a first partition plate, a second partition plate, and a third partition plate with a hollow structure inside the tank body. A diatomaceous earth adsorption layer is provided between the first partition plate and the tank body, an activated carbon adsorption layer is provided between the first partition plate and the second partition plate, an alumina adsorption layer is provided between the second partition plate and the third partition plate, and a water storage area is formed between the third partition plate and the tank body.

[0009] As an improved technical solution, the anaerobic treatment equipment includes a main body, with an inlet and an outlet at the top of the main body, and an outlet on one side of the lower part of the main body. The main body has a hollow cylinder inside, and a microbial layer is provided inside the cylinder. A stirring shaft is provided at the upper part of the cylinder, one end of which is connected to a motor. A fixed seat is provided on the stirring shaft, and multiple stirring rods are provided on the fixed seat.

[0010] As an improved technical solution, the ion exchange resin treatment equipment includes a cation exchange resin treatment device, an anion exchange resin treatment device, and a chelation resin treatment device connected in series.

[0011] After adopting the above technical solution, the beneficial effects of this utility model are:

[0012] The wastewater treatment system for bromonitrile production includes a flocculation device connected to a wastewater conveying pipeline. The outlet of the flocculation device is connected to a neutralization tank, the outlet of the neutralization tank is connected to an adsorption tank, the outlet of the adsorption tank is connected to an anaerobic treatment device, the outlet of the anaerobic treatment device is connected to an ion exchange resin device, the outlet of the ion exchange resin device is connected to a reverse osmosis membrane treatment device, and the outlet of the reverse osmosis membrane treatment device is connected to a wastewater discharge pipeline. In actual production, wastewater collected during the production of bromonitol is pumped through a wastewater pipeline to the flocculation equipment. After reacting with the flocculant, the wastewater forms flocculated sediment (removing suspended solids, colloidal substances, and some organic matter). The wastewater then flows through a pipeline into a neutralization tank, where it is adjusted to neutral pH before entering an adsorption tank. Adsorption by the adsorption layer effectively removes pigments, organic matter, and heavy metal ions. The wastewater then flows through a pipeline into an anaerobic treatment unit, where further treatment removes organic matter, toxic substances, and sulfates. Next, it enters an ion exchange resin treatment unit, where heavy metal cations and anions are effectively removed. Finally, it undergoes reverse osmosis membrane treatment, which effectively removes dissolved salts, small molecule organic matter, and microorganisms, reducing environmental pollution. Once the wastewater meets discharge standards, it is discharged through a wastewater discharge pipeline. This wastewater treatment system is rationally designed, effectively treating wastewater and reducing environmental pollution.

[0013] The flocculation equipment includes a main body, inside which are interconnected a first reaction chamber, a second reaction chamber, and a settling chamber. The first reaction chamber has an inlet on one side and a dosing port on the top, while the second settling chamber has a dosing port on the top. A first partition separates the first and second reaction chambers, and a second partition separates the second reaction chamber and the settling chamber. An outlet is located at the bottom of the first partition and at the top of the second partition. Each of the first, second, and settling chambers has a rotating shaft inside, one end of which is connected to a motor. Multiple stirring plates are mounted on the rotating shaft. The settling chamber has multiple corrugated plates inside, a conical bottom, a drain pipe at the bottom, and an outlet on one side of the upper part of the settling chamber. Wastewater enters the first reaction chamber, where reagents are added and the wastewater is stirred by a rotating shaft and agitator plates. After sufficient reaction, the wastewater enters the second reaction chamber, where reagents are added again and the wastewater is stirred by a rotating shaft and agitator plates. After sufficient reaction, the wastewater enters the settling chamber, where the formed flocculent sediments accumulate at the bottom. With further stirring by the rotating shaft and agitator plates, the flocculent sediments are discharged through a drain pipe, while the wastewater passing through the corrugated plate is discharged from the outlet. This flocculation equipment, with its reasonable design, effectively settles suspended solids and particulate matter in wastewater, facilitating subsequent effective wastewater treatment.

[0014] The neutralization tank comprises a tank body and a cover. An inlet is located on one side of the tank body, a pH adjuster inlet is located at the top, and a drain outlet is located on one side of the lower part. Inside the tank body is a rotating shaft, one end of which is connected to a motor. Multiple stirring rods are mounted on the shaft, and each stirring rod has multiple triangular stirring blocks. Wastewater treated by the flocculation equipment enters the tank body, and a pH adjuster is added. After the motor starts, it drives the rotating shaft, the stirring rods, and the triangular stirring blocks to mix the wastewater and the pH adjuster. Once the pH of the wastewater is determined to be neutral using pH test strips, the wastewater is then transferred to the next treatment device. This neutralization tank design is reasonable and facilitates the adjustment of the wastewater's pH to neutral.

[0015] The adsorption tank comprises a tank body with an inlet pipe on one side and an outlet pipe on the other. Inside the tank body are perforated first, second, and third partition plates. A diatomaceous earth adsorption layer lies between the first partition plate and the tank body; an activated carbon adsorption layer lies between the first and second partition plates; and an alumina adsorption layer lies between the second and third partition plates. A water storage area is formed between the third partition plate and the tank body. After entering the tank body, wastewater first undergoes adsorption treatment by the diatomaceous earth adsorption layer, then passes through the first partition plate, followed by adsorption treatment by the activated carbon adsorption layer, then through the second partition plate, then through the alumina adsorption layer, and finally through the third partition plate into the water storage area, before being discharged through the outlet pipe. This adsorption tank design is reasonable. Through the synergistic effect of the diatomaceous earth, activated carbon, and alumina adsorption layers, it can effectively remove some organic matter, pigments, and metal ions, reducing wastewater pollution to the surrounding environment.

[0016] The anaerobic treatment equipment consists of a main body with an inlet and an outlet at the top and an outlet on one side of the lower part. Inside the main body is a hollow cylinder containing a microbial layer. A stirring shaft is located at the top of the cylinder, with a motor connected to one end. A mounting base with multiple stirring rods is mounted on the stirring shaft. When wastewater enters the main body, the motor starts, driving the stirring shaft and multiple stirring plates to rotate, ensuring full contact between the wastewater and the microbial layer. The microbial layer effectively degrades the organic matter in the wastewater. The generated gas is then discharged through the outlet to other treatment equipment (not included in the protected content and therefore not described in detail) for further treatment. This anaerobic treatment equipment is rationally designed and can effectively degrade organic matter in wastewater, reducing wastewater pollution to the surrounding environment.

[0017] The ion exchange resin treatment equipment comprises cation exchange resin treatment equipment, anion exchange resin treatment equipment, and chelating resin treatment equipment connected in series. This combined resin treatment equipment can effectively remove metal cations, anions, and heavy metal ions, reducing wastewater pollution to the surrounding environment. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the wastewater treatment system for the production of bromonitrol according to this utility model;

[0019] Among them, 1-wastewater conveying pipeline, 2-flocculation equipment, 20-first reaction chamber, 21-second reaction chamber, 22-third reaction chamber, 23-first partition, 24-second partition, 25-corrugated plate, 3-neutralization tank, 4-adsorption tank, 40-first partition, 41-second partition, 42-third partition, 43-diatomaceous earth adsorption layer, 44-activated carbon adsorption layer, 45-alumina adsorption layer, 46-water storage area, 5-anaerobic treatment equipment, 50-cylinder, 51-microbial layer, 6-ion exchange resin equipment, 60-cation resin treatment equipment, 61-anion resin treatment equipment, 62-chelating resin treatment equipment, 7-reverse osmosis membrane treatment equipment, 8-wastewater discharge pipeline. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0021] A wastewater treatment system for bromonitrile production includes a flocculation device 2 connected to a wastewater conveying pipeline 1, an outlet of the flocculation device 2 connected to a neutralization tank 3, an outlet of the neutralization tank 3 connected to an adsorption tank 4, an outlet of the adsorption tank 4 connected to an anaerobic treatment device 5, an outlet of the anaerobic treatment device 5 connected to an ion exchange resin device 6, an outlet of the ion exchange resin device 6 connected to a reverse osmosis membrane treatment device 7, and an outlet of the reverse osmosis membrane treatment device 7 connected to a wastewater discharge pipeline 8.

[0022] In actual production, the wastewater collected during the production of bromonitol is transported to the flocculation equipment via a wastewater pipeline by a pump. After the wastewater reacts with the flocculant, flocculation and sedimentation are formed (removing suspended solids, colloidal substances, and some organic matter). The wastewater then enters the neutralization tank through the pipeline. After being adjusted to neutral by a pH adjuster, it enters the adsorption tank through the adsorption layer. Pigments, organic matter, and heavy metal ions are effectively removed. The wastewater then enters the anaerobic treatment equipment through the pipeline. After treatment, organic matter, toxic substances, sulfates, etc. are further removed. Then it enters the ion mixing resin equipment. After treatment, heavy metal cations and anions are effectively removed. Finally, it is treated by the reverse osmosis membrane equipment, which effectively removes dissolved salts, small molecule organic matter, microorganisms, etc., reducing the pollution of the surrounding environment. After the wastewater meets the discharge standards, it is discharged from the wastewater discharge pipeline.

[0023] The flocculation device 2 includes a main body, inside which are interconnected a first reaction chamber 20, a second reaction chamber 21, and a settling chamber 22. The first reaction chamber 20 has an inlet on one side and a dosing port on the top, and the second settling chamber 21 has a dosing port on the top. A first partition 23 is provided between the first reaction chamber 20 and the second reaction chamber 21, and a second partition 24 is provided between the second reaction chamber 21 and the settling chamber 22. The lower part of the first partition 23 has an outlet, and the upper part of the second partition 24 has an outlet. The first reaction chamber 20, the second reaction chamber 21, and the settling chamber 22 each have a rotating shaft inside, one end of which is connected to a motor. Multiple stirring plates are mounted on the rotating shaft. The settling chamber 22 has multiple corrugated plates 25 inside, and its bottom is conical. A drain pipe is located at the bottom of the settling chamber, and an outlet is located on one side of the upper part of the settling chamber. Wastewater enters the first reaction chamber, where reagents are added and the wastewater is stirred by a rotating shaft and a stirring plate. After the reaction is complete, the wastewater enters the second reaction chamber, where reagents are added again and the wastewater is stirred by a rotating shaft and a stirring plate. After the reaction is complete, the wastewater enters the settling chamber, where the flocculated sediments accumulate at the bottom. As the rotating shaft and a stirring plate continue to stir, the flocculated sediments are discharged through the drain pipe, while the wastewater that has passed through the corrugated plate is discharged from the outlet.

[0024] Neutralization tank 3 includes a tank body and a tank cover. An inlet is located on one side of the tank body, a pH adjuster inlet is located at the top of the tank body, and a drain outlet is located on one side of the lower part of the tank body. Inside the tank body is a rotating shaft, one end of which is connected to a motor. Multiple stirring rods are mounted on the shaft, and each stirring rod has multiple triangular stirring blocks. Wastewater treated by the flocculation equipment enters the tank body, and a pH adjuster is added. After the motor starts, it drives the rotating shaft, multiple stirring rods, and triangular stirring blocks to mix the wastewater and pH adjuster. When the pH of the wastewater is detected as neutral using pH test strips, the wastewater is then transported to the next treatment device.

[0025] The adsorption tank 4 includes a tank body and a tank cover. An inlet pipe is located on one side of the upper part of the tank body, and an outlet pipe is located on the lower side of the other side. Inside the tank body are perforated partition plates 40, 41, and 42. A diatomaceous earth adsorption layer 43 is located between the first partition plate 40 and the tank body. An activated carbon adsorption layer 44 is located between the first and second partition plates 40 and 41. An alumina adsorption layer 45 is located between the second and third partition plates 41 and 42. A water storage area 46 is formed between the third partition plate 42 and the tank body. After entering the tank body, wastewater first undergoes adsorption treatment by the diatomaceous earth adsorption layer, then passes through the first partition plate, then the activated carbon adsorption layer, then the second partition plate, then the alumina adsorption layer, then the third partition plate, and finally enters the water storage area before being discharged through the outlet pipe. This adsorption tank design is reasonable. Through the synergistic effect of the diatomaceous earth, activated carbon, and alumina adsorption layers, it can effectively remove some organic matter, pigments, and metal ions, reducing the pollution of the surrounding environment.

[0026] The anaerobic treatment device 5 includes a main body with an inlet and an outlet at the top and an outlet on one side of the lower part. Inside the main body is a hollow cylinder 50 (fixed to the bottom of the main body by connecting rods), containing a microbial layer 51. A stirring shaft is located at the top of the cylinder, with a motor connected to one end. A fixed base is mounted on the stirring shaft, and multiple stirring rods are mounted on the fixed base. Wastewater enters the main body, and after the motor starts, it drives the stirring shaft and multiple stirring plates to rotate, ensuring full contact between the wastewater and the microbial layer. Through the treatment of the wastewater by the microbial layer, the organic matter in the wastewater can be effectively degraded. The generated gas is discharged through the outlet into other treatment equipment (not included in the protected content and therefore not described in detail) for further treatment. This anaerobic treatment device is rationally designed and can effectively degrade organic matter in wastewater, reducing wastewater pollution to the surrounding environment.

[0027] The ion exchange resin treatment equipment 6 includes a cation exchange resin treatment equipment 60, an anion exchange resin treatment equipment 61, and a chelating resin treatment equipment 62 connected in series. This combination of resin treatment equipment can effectively remove metal cations, anions, and heavy metal ions, reducing wastewater pollution to the surrounding environment.

[0028] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A system for treating wastewater from the production of bronopol, characterized in that The system includes a flocculation device connected to a wastewater conveying pipeline. The outlet of the flocculation device is connected to a neutralization tank. The outlet of the neutralization tank is connected to an adsorption tank. The outlet of the adsorption tank is connected to an anaerobic treatment device. The outlet of the anaerobic treatment device is connected to an ion exchange resin device. The outlet of the ion exchange resin device is connected to a reverse osmosis membrane treatment device. The outlet of the reverse osmosis membrane treatment device is connected to a wastewater discharge pipeline.

2. The system for treating wastewater from the production of bronopol according to claim 1, characterized in that, The flocculation device includes a main body, inside which are interconnected a first reaction chamber, a second reaction chamber, and a settling chamber. The first reaction chamber has an inlet on one side and a dosing port on the top, and the second settling chamber has a dosing port on the top. A first partition is provided between the first and second reaction chambers, and a second partition is provided between the second reaction chamber and the settling chamber. An outlet is located at the bottom of the first partition and at the top of the second partition. Rotating shafts are located inside the first, second, and settling chambers, with one end connected to a motor and multiple stirring plates mounted on the shafts. Multiple corrugated plates are located inside the settling chamber, which has a conical bottom and a drain pipe at the bottom. An outlet is located on one side of the upper part of the settling chamber.

3. The system for treating wastewater from the production of bronopol according to claim 1, characterized in that, The neutralization tank includes a tank body and a tank cover. A water inlet is provided on one side of the tank body, a pH adjuster inlet is provided on the top of the tank body, and a drain outlet is provided on the lower side of the tank body. A rotating shaft is provided inside the tank body. One end of the rotating shaft is connected to a motor. Multiple stirring rods are provided on the rotating shaft, and multiple triangular stirring blocks are provided on the stirring rods.

4. The system for treating wastewater from the production of bronopol according to claim 1, characterized in that, The adsorption tank includes a tank body, with an inlet pipe on one side and an outlet pipe on the other side. The tank body has a hollowed-out first partition plate, a second partition plate, and a third partition plate. A diatomaceous earth adsorption layer is provided between the first partition plate and the tank body. An activated carbon adsorption layer is provided between the first and second partition plates. An alumina adsorption layer is provided between the second and third partition plates. A water storage area is formed between the third partition plate and the tank body.

5. The wastewater treatment system for bromonitrile production according to claim 1, characterized in that, The anaerobic treatment equipment includes a main body, with an inlet and an outlet at the top and an outlet at the bottom. Inside the main body is a hollow cylinder containing a microbial layer. A stirring shaft is located at the top of the cylinder, with a motor connected to one end. A fixed base is mounted on the stirring shaft, and multiple stirring rods are mounted on the fixed base.

6. The system for treating wastewater from the production of bronopol according to claim 1, characterized in that, The ion exchange resin treatment equipment includes a cation exchange resin treatment device, an anion exchange resin treatment device, and a chelation resin treatment device connected in series.

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