Process for treating o-nitroaniline production wastewater

Abstract

The application discloses a kind of o-nitroaniline production wastewater treatment processes, belong to wastewater treatment field, the device includes the following steps: step one: resin prewash, step two: resin preheating, step three: resin adsorption, the adsorption barrel in resin preheating is taken out, while o-nitroaniline wastewater is placed into a group of processing barrels, adsorption barrel is placed into a group of processing barrels to carry out adsorption to o-nitroaniline in the o-nitroaniline wastewater in processing barrel inside;Step four: resin desorption, methanol is added in processing barrel and is desorbed;By first prewashing macroporous resin, remove the impurities in macroporous resin, increase the adsorption state of macroporous resin, then preheat macroporous resin again, promote the expansion of the internal pore of macroporous resin, increase the specific surface area of resin, improve the adsorption capacity of resin, to improve the effect of macroporous resin on o-nitroaniline wastewater adsorption treatment.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wastewater treatment, in particular to a process for treating o-nitroaniline production wastewater. BACKGROUND

[0002] At present, the main methods for treating o-nitroaniline wastewater at home and abroad are catalytic degradation, advanced oxidation and biodegradation. These methods have problems such as high treatment cost, complex operation, and non-recyclable treatment agent, which makes it difficult to realize the resourceization and harmlessness of wastewater.

[0003] Macroporous adsorption resin is a kind of high molecular adsorption resin without exchange groups and with macroporous structure, which has good macroporous network structure and large specific surface area, and can selectively adsorb organic matter in aqueous solution by physical adsorption. However, the existing macroporous adsorption resin has slow adsorption treatment effect when used for adsorption treatment of o-nitroaniline wastewater, which reduces the efficiency of adsorption treatment. At the same time, the use and treatment conversion between multiple devices reduce the efficiency of o-nitroaniline wastewater treatment. SUMMARY

[0004] In order to overcome the above technical problems, the purpose of the present application is to provide a process for treating o-nitroaniline production wastewater, so as to solve the problem in the prior art that the existing macroporous adsorption resin has slow adsorption treatment effect when used for adsorption treatment of o-nitroaniline wastewater, which reduces the efficiency of adsorption treatment. At the same time, the use and treatment conversion between multiple devices reduce the efficiency of o-nitroaniline wastewater treatment.

[0005] The purpose of the present application can be achieved by the following technical solutions:

[0006] A process for treating o-nitroaniline production wastewater, comprising the following steps:

[0007] Step one: resin prewashing, the macroporous resin is put into the adsorption barrel in the treatment device, then the adsorption barrel is moved to a group of treatment cylinders, and the macroporous resin is prewashed by the solvent inside the group of treatment cylinders to achieve the best adsorption state;

[0008] Step two: resin preheating, then the adsorption barrel in the resin prewashing step is taken out and moved to another group of treatment cylinders for heating;

[0009] Step three: resin adsorption, the adsorption barrel in the resin preheating step is taken out, and o-nitroaniline wastewater is put into a group of treatment cylinders, and the adsorption barrel is put into the group of treatment cylinders to adsorb o-nitroaniline in the o-nitroaniline wastewater in the treatment cylinders;

[0010] Step four: resin desorption, the adsorption barrel in the resin adsorption step is taken out and put into a group of treatment cylinders, then methanol is added to the treatment cylinders for desorption.

[0011] As a further solution of the present invention: the solvent used in step 1 is a solution such as ethanol or acetone.

[0012] As a further solution of the present invention: in step 2, the heating temperature is 45°C hot water.

[0013] As a further solution of the present invention: the processing equipment in step one includes a base, a group of adsorption barrels and multiple groups of processing barrels in a circular array, the multiple groups of processing barrels are respectively used for resin pre-washing, resin preheating, resin adsorption and resin desorption, a fixed column is fixedly connected to the base, a driving motor is fixedly connected to the fixed column, the output end of the driving motor is fixedly connected to a support plate, the support plate is fixedly connected to a lifting cylinder, the output end of the lifting cylinder is fixedly connected to a rotating motor, and the output end of the rotating motor is fixedly connected to the top of the adsorption barrel.

[0014] As a further solution of the present invention: a rotating shaft is rotatably connected inside the adsorption barrel, and a plurality of stirring rods are fixedly connected to the outer wall of the rotating shaft.

[0015] As a further solution of the present invention: aeration plates are provided on the inner walls of the bottoms of the multiple groups of treatment cylinders, an air supply pump is fixedly connected to the base, and an output end of the air supply pump is connected to the multiple groups of aeration plates.

[0016] As a further solution of the present invention: a protective ring is fixedly connected to the top of the base, and the protective ring is located outside the multiple groups of processing cylinders.

[0017] As a further solution of the present invention: multiple groups of the treatment cylinder outer walls are provided with stirring motors, the output end of the stirring motor passes through the treatment cylinder and is fixedly connected to a holder, one end of the rotating shaft passes through the adsorption barrel and is fixedly connected to a block, and the holder cooperates with the block.

[0018] Beneficial effects of the present invention:

[0019] In the present invention, the macroporous resin is pre-washed to remove impurities in the macroporous resin, thereby increasing the adsorption state of the macroporous resin. The macroporous resin is then preheated to promote the expansion of the internal pores of the macroporous resin, increase the specific surface area of ​​the resin, and improve the adsorption capacity of the resin, thereby improving the adsorption treatment effect of the macroporous resin on o-nitroaniline wastewater. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below with reference to the accompanying drawings.

[0021] Figure 1 It is a process flow chart of the present invention;

[0022] Figure 2 It is a schematic diagram of the overall structure of the present invention;

[0023] Figure 3This is a schematic diagram of the top view of the base structure of the present invention;

[0024] Figure 4 This is a schematic diagram of the cross-sectional structure of the treatment tube in the present invention;

[0025] Figure 5 It is a schematic diagram of the top view of the adsorption barrel in the present invention.

[0026] In the figure: 1. Base; 101. Protective ring; 2. Treatment cylinder; 201. Slide; 3. Adsorption barrel; 4. Fixed column; 401. Drive motor; 402. Support plate; 5. Lifting cylinder; 501. Rotating motor; 6. Rotating shaft; 601. Stirring rod; 602. Block; 7. Stirring motor; 701. Card seat; 8. Aeration plate; 801. Air supply pump. DETAILED DESCRIPTION

[0027] The following will provide a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0028] like Figure 1-Figure 5 As shown in FIG, a process for treating wastewater from o-nitroaniline production, such as Figure 1 As shown, the o-nitroaniline production wastewater treatment process of this embodiment comprises the following steps:

[0029] Step 1: Pre-washing the resin. The macroporous resin is placed in the adsorption barrel 3 in the processing equipment. The adsorption barrel 3 is then moved to a group of processing barrels 2. The macroporous resin is pre-washed with a solvent inside the group of processing barrels 2 to achieve the best adsorption state. The solvent is ethanol or acetone, etc., so as to remove impurities in the resin and make the resin reach the best adsorption state. At the same time, the pre-washing can flush out the impurities in the resin and adjust the humidity of the resin.

[0030] Step 2: Preheat the resin. Then, remove the adsorption barrel 3 from the resin pre-washing step and move it to another set of treatment barrels 2 for heating. Use 45°C hot water to heat the perforated adsorption resin. This is beneficial to the diffusion of the adsorbate and the adsorption reaction. Preheating can also promote the expansion of the internal pores of the perforated resin, increase the specific surface area of ​​the resin, and improve the adsorption capacity of the resin.

[0031] Step 3: Resin adsorption. Take out the adsorption barrel 3 from the resin preheating process. At the same time, put the o-nitroaniline wastewater into a group of treatment barrels 2. The adsorption barrel 3 is placed into a group of treatment barrels 2 to adsorb the o-nitroaniline in the o-nitroaniline wastewater inside the treatment barrels 2.

[0032] Step 4: Resin desorption, take out the adsorption barrel 3 in the resin adsorption step, and then put it into a set of treatment cylinders 2, and then add methanol into the treatment cylinders 2 for desorption.

[0033] like Figure 2 and Figure 5 As shown, the processing equipment in the above step one includes a base 1, a group of adsorption barrels 3 and multiple groups of processing barrels 2 in a circumferential array, and the multiple groups of processing barrels 2 are respectively used for resin pre-washing, resin preheating, resin adsorption and resin desorption. A fixed column 4 is fixedly connected to the base 1, and a drive motor 401 is fixedly connected to the fixed column 4. The output end of the drive motor 401 is fixedly connected to a support plate 402, and the support plate 402 is fixedly connected to a lifting cylinder 5. The output end of the lifting cylinder 5 is fixedly connected to a rotating motor 501, and the output end of the rotating motor 501 is fixedly connected to the top of the adsorption barrel 3.

[0034] like Figure 2 and Figure 5 As shown, the adsorption barrel 3 mentioned above is internally connected to a rotating shaft 6, and a plurality of stirring rods 601 are fixedly connected to the outer wall of the rotating shaft 6. At the same time, a slide groove 201 is opened on the inner wall of each group of treatment barrels 2, and a stirring motor 7 is fixedly connected to the outer wall of the treatment barrel 2. The output end of the stirring motor 7 passes through the inside of the slide groove 201 and is fixedly connected to a holder 701, and one end of the rotating shaft 6 passes through the adsorption barrel 3 and is fixedly connected to a block 602.

[0035] like Figure 2 and Figure 4 As shown, the bottom inner walls of the multiple groups of treatment tubes 2 mentioned above are all provided with aeration plates 8, and an air supply pump 801 is fixedly connected to the base 1. The output end of the air supply pump 801 is connected to the multiple groups of aeration plates 8. By starting the air supply pump 801, air is provided to the aeration plates 8, and then sprayed from the air outlet holes on the aeration plates 8 into the multiple groups of treatment tubes 2, so that the macroporous resin in the multiple groups of treatment tubes 2 reacts quickly with the corresponding solution, thereby improving the treatment efficiency.

[0036] like Figure 2 and Figure 3 As shown, a protective ring 101 is fixedly connected to the top of the base 1, and the protective ring 101 is located on the outside of the multiple groups of treatment cylinders 2. The base 1 is intercepted by the protective ring 101, so that when the adsorption barrel 3 moves on the multiple groups of treatment barrels 2, the water dripping when the adsorption barrel 3 moves is intercepted.

[0037] like Figure 3 、 Figure 4 and Figure 5As shown, the outer walls of the multiple groups of treatment cylinders 2 mentioned above are all provided with stirring motors 7, the output end of the stirring motor 7 passes through the treatment cylinder 2 and is fixedly connected to a holder 701, one end of the rotating shaft 6 passes through the adsorption barrel 3 and is fixedly connected to a block 602, the holder 701 cooperates with the block 602, so that when the adsorption barrel 3 is moved to the inside of the multiple groups of treatment cylinders 2 respectively, the holder 701 and the block 602 are engaged, and then the stirring motor 7 can drive the stirring rod 601 to rotate through the rotating shaft 6, thereby stirring the macroporous resin inside the adsorption barrel 3, thereby improving the efficiency of the use and treatment of the macroporous resin.

[0038] The macroporous resins selected in the above-mentioned are LS-107A, LS-109D, IS-106C, and LS-200 macroporous adsorption resins. They have strong adsorption capacity for phenolic substances with a certain polarity, and can adsorb various polar organic compounds such as o-nitroaniline that are difficult to dissolve in water but highly soluble in organic solvents such as ethanol and acetone, with good results.

[0039] The working principle of the present invention is as follows: when the user uses it, the macroporous resin is placed inside the adsorption barrel 3, and then the lifting cylinder 5 is started to drive the adsorption barrel 3 to move downward to the inside of a group of treatment barrels 2, and the macroporous resin inside the adsorption barrel 3 is soaked and pre-washed by the solvent inside the treatment barrel 2. At the same time, when the adsorption barrel 3 moves downward to the inside of the treatment barrel 2, the block 602 on the outer wall of the adsorption barrel 3 slides in the slide groove 201 on the inner wall of the treatment barrel 2, slides into the inside of the card seat 701 on the output end of the stirring motor 7 for limiting, and then the stirring motor 7 is started. The stirring motor 7 drives the rotating shaft 6 to rotate through the engagement between the card seat 701 and the card block 602, and the rotating shaft 6 drives the stirring rod 601 to rotate inside the adsorption barrel 3, so as to adjust the adsorption barrel. 3 is stirred, thereby improving the effect of pre-washing of the macroporous resin, being able to complete the pre-washing of the macroporous resin faster and improving the efficiency of the pre-washing. After the pre-washing is completed, the lifting cylinder 5 is started to drive the adsorption barrel 3 to move upward. The adsorption barrel 3 moves upward until it is partially separated from the inside of the treatment barrel 2, while the part containing the macroporous resin is still inside the treatment barrel 2 and separated from the solvent. Then the rotating motor 501 is started, and the rotating motor 501 drives the adsorption barrel 3 to rotate, and throws out the residual solvent in the adsorption barrel 3, reducing the residual solvent in the adsorption barrel 3. Then the lifting cylinder 5 is started again to drive the adsorption barrel 3 to be completely moved out of the inside of the treatment barrel 2, and then the drive motor 401 is started. The drive motor 401 is driven The adsorption barrel 3 is driven to move to the top of another group of treatment barrels 2 through the support plate 402, and then the lifting cylinder 5 is started to drive the adsorption barrel 3 to move downward to the inside of the treatment barrel 2, and the hot water inside the treatment barrel 2 is used for preheating to expand the internal pores of the macroporous resin, thereby increasing the adsorption capacity of the macroporous resin. At the same time, when inside the treatment barrel 2, the stirring motor 7 is started through the same operation as above to drive the stirring rod 601 to rotate, and the macroporous resin inside the adsorption barrel 3 is stirred to ensure sufficient contact between the macroporous resin and the hot water, thereby improving the uniformity and efficiency of preheating. After the preheating is completed, the adsorption barrel 3 is driven to move to the inside of the next group of treatment barrels 2 again through the above operation. At this time, the adsorption barrel 2 is placed inside the treatment barrel 2. For the o-nitroaniline wastewater to be treated, the adsorption barrel 3 adsorbs harmful substances in the o-nitroaniline wastewater inside the treatment barrel 2. At the same time, the stirring motor 7 is started through the same operation as above to drive the stirring rod 601 to rotate, stirring the macroporous resin inside the adsorption barrel 3, thereby accelerating the adsorption of harmful substances in the o-nitroaniline wastewater by the macroporous resin. After the adsorption is completed, the adsorption barrel 3 is removed from the treatment barrel 2 and then moved to the treatment barrel 2 for resin desorption. The macroporous resin is desorbed by the methanol inside the treatment barrel 2, thereby completing the entire process of o-nitroaniline wastewater treatment. Then, the o-nitroaniline wastewater can be repeatedly treated by cyclically repeating the above operation to improve the treatment efficiency.

[0040] The above is a detailed description of an embodiment of the present invention. However, the content described is only a preferred embodiment of the present invention and should not be considered to limit the scope of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A process for treating o-nitroaniline production wastewater, characterized in that: The following steps are involved: Step 1: Pre-washing the resin, placing the macroporous resin into the adsorption barrel (3) in the processing equipment, and then moving the adsorption barrel (3) into a group of processing barrels (2), and pre-washing the macroporous resin with the solvent inside the group of processing barrels (2) to achieve the best adsorption state; Step 2: preheating the resin, then taking out the adsorption barrel (3) from the resin pre-washing step, and moving it to another set of treatment barrels (2) for heating; Step 3: Resin adsorption, taking out the adsorption barrel (3) in the resin preheating process, and at the same time putting the o-nitroaniline production wastewater into a group of treatment barrels (2), and putting the adsorption barrel (3) into the group of treatment barrels (2) to adsorb the o-nitroaniline in the o-nitroaniline production wastewater inside the treatment barrels (2); Step 4: Resin desorption, taking out the adsorption barrel (3) in the resin adsorption step, and then placing it into a set of treatment barrels (2), and then adding methanol into the treatment barrels (2) for desorption; The processing equipment in step 1 includes a base (1), a group of adsorption barrels (3) and multiple groups of processing barrels (2) in a circumferential array, wherein the multiple groups of processing barrels (2) are respectively used for resin pre-washing, resin preheating, resin adsorption and resin desorption, a fixed column (4) is fixedly connected to the base (1), a driving motor (401) is fixedly connected to the fixed column (4), an output end of the driving motor (401) is fixedly connected to a support plate (402), a lifting cylinder (5) is fixedly connected to the support plate (402), an output end of the lifting cylinder (5) is fixedly connected to a rotating motor (501), and an output end of the rotating motor (501) is fixedly connected to the top of the adsorption barrel (3); The adsorption barrel (3) is internally rotatably connected to a rotating shaft (6), and the outer wall of the rotating shaft (6) is fixedly connected to multiple groups of stirring rods (601); The outer walls of the plurality of treatment cylinders (2) are all provided with stirring motors (7), the output end of the stirring motor (7) passes through the treatment cylinder (2) and is fixedly connected to a holder (701), one end of the rotating shaft (6) passes through the adsorption barrel (3) and is fixedly connected to a block (602), and the holder (701) cooperates with the block (602).

2. A process for treating o-nitroaniline production wastewater according to claim 1, characterized in that: The solvent used in step 1 is ethanol or acetone solution.

3. A process for treating o-nitroaniline production wastewater according to claim 1, characterized in that: In step 2, 45°C hot water is used for heating.

4. A process for treating o-nitroaniline production wastewater according to claim 1, characterized in that: Aeration discs (8) are provided on the inner walls of the bottoms of the multiple groups of treatment cylinders (2), an air supply pump (801) is fixedly connected to the base (1), and the output end of the air supply pump (801) is connected to the multiple groups of aeration discs (8).

5. A process for treating o-nitroaniline production wastewater according to claim 1, characterized in that: A protective ring (101) is fixedly connected to the top of the base (1), and the protective ring (101) is located outside the multiple groups of processing cylinders (2).

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