CN117700049A - A kind of styrene-butadiene rubber wastewater treatment process - Google Patents

Abstract

The invention provides a treatment process of butyl rubber wastewater, which comprises the following steps: step S1, introducing styrene-butadiene latex wastewater generated in a production workshop into a styrene-butadiene latex wastewater collection tank, and simultaneously opening an aeration pipe for aeration; s2, introducing the aerated styrene-butadiene latex wastewater into a wastewater mixing and stirring vertical flow sedimentation tower from the bottom, and opening a stirring and dosing pipe for mixing; s3, opening a dissolved air floatation stirring, an air compressor and a mud scraper to separate scum again; s4, introducing the wastewater into a UBF reactor to generate gas, recovering the gas, treating the gas, conveying sludge to a sludge tank, and flowing the treated wastewater to a biochemical treatment system; s5, the biochemical treatment system carries out advanced treatment on the wastewater treated by the UBF reactor, the wastewater treated by the biochemical treatment system is introduced into a secondary sedimentation tank to be discharged after qualified wastewater is detected, and the unqualified wastewater is treated again by a re-flow system; the invention can realize the efficient treatment of the wastewater and can lead the high-concentration wastewater to meet the discharge standard.

Description

A kind of styrene-butadiene rubber wastewater treatment process

Technical field

The invention relates to the technical field of high-concentration COD wastewater treatment technology, especially a styrene-butadiene rubber wastewater treatment technology.

Background technique

Styrene-butadiene latex is made from the emulsion copolymerization of butadiene and styrene. The styrene-butadiene latex wastewater generated from washing tons of barrels, tank washing trucks, washing reactors, laboratory inspections, condensation, etc. will not become sticky. It does not soften but hardens. The styrene-butadiene latex wastewater has high concentrations of COD and NH3-N. It is difficult to make the water quality qualified through simple treatment. Under normal circumstances, the generated wastewater is reused for the preparation of styrene-butadiene latex. If it cannot be reused, it needs Disposal is required.

During the collection process of styrene-butadiene latex wastewater, wastewater of different concentrations may be mixed, making the treatment more complicated and therefore requiring multiple treatment methods. To this end, we proposed a styrene-butadiene latex wastewater treatment process to solve the problem of difficult treatment of styrene-butadiene latex wastewater.

The existing O-A-O biochemical treatment process cannot satisfy the treatment of high-concentration COD and NH3-N in styrene-butadiene latex wastewater.

Contents of the invention

In view of this, the object of the present invention is to provide a styrene-butadiene rubber wastewater treatment process that can achieve efficient wastewater treatment and enable high-concentration wastewater to comply with discharge standards.

The present invention adopts the following method to realize: a styrene-butadiene rubber wastewater treatment process, the process includes the following steps:

Step S1: Pass the styrene-butadiene latex wastewater generated in the production workshop into the styrene-butadiene latex wastewater collection tank and open the aeration pipe for aeration;

Step S2: Pass the aerated styrene-butadiene latex wastewater from the bottom into the wastewater mixing and stirring vertical flow sedimentation tower and open the stirring and dosing pipes for mixing;

Step S3: Turn on the dissolved air flotation stirring, air compressor, and mud scraper to separate the scum again;

Step S4: The wastewater is passed into the UBF reactor to generate gas and recycled to the waste gas treatment, the sludge is transported to the sludge tank, and the treated wastewater flows to the biochemical treatment system;

Step S5: The biochemical treatment system performs advanced treatment on the wastewater treated by the UBF reactor. The wastewater treated by the biochemical treatment system is passed into the secondary sedimentation tank and the qualified wastewater is discharged. The unqualified wastewater is processed again by the reflux system.

Further, the aeration pipe in step S1 is connected to the bottom of the styrene-butadiene latex wastewater collection tank, and the outlet of the styrene-butadiene latex wastewater collection tank is equipped with a basket filter and a wastewater centrifugal pump.

Further, the wastewater mixing and stirring vertical flow sedimentation tower in step S2 is divided into three areas, three motor stirring, and three different dosing pipelines. The wastewater treated in step 1 is first introduced into the first area, and the stirring part is opened. The corresponding chemicals are stirred and simultaneously introduced into the second and third areas in the same way; the treated wastewater in the third area is passed into the sedimentation tank and the scum sinks to the bottom of the tank and is driven into the sludge tank, and the supernatant flows to the dissolved air for flotation. The sedimentation tank is also connected to the aeration center.

Further, in the step S3, the stirring part of the dissolved air flotation mixes the wastewater, stirs the vertical flow sedimentation tower, and passes the supernatant liquid into the vertical flow sedimentation tower for stirring and mixing again. The treated wastewater flows into the air flotation part, where the gas generated by the air compressor is passed to the bottom. The sludge scraper is located at the top, and a sludge outlet is provided at the bottom of each part to flow to the sludge tank.

Further, the aeration pipe of the sludge tank leads to the bottom of the tank, and the water outlet of the sludge tank leads to a plate filter press. The plate filter press is equipped with a collection tank and flows to the UBF reactor through a centrifugal pump.

Further, a sludge outlet is provided at the bottom of the UBF reactor and biochemical treatment system and flows to the sludge tank through a centrifugal pump.

Further, connect the air outlet of the Roots blower to the bottom of the UBF reactor and biochemical treatment system.

Further, the biochemical treatment system includes a contact oxidation tank, an acidolysis tank, and an activated sludge tank to perform deep biochemical treatment of the wastewater treated by the UBF reactor.

The beneficial effects of the present invention are: the present invention mixes and aerates different styrene-butadiene latex wastewater to remove excess functional monomers, filters waste residues of more than 300 mesh, and then passes the wastewater into a mixing and stirring vertical flow sedimentation tower to mix the styrene-butadiene latex wastewater with pharmaceuticals. Mix thoroughly to separate the scum and wastewater; separate the scum and wastewater again through dissolved air flotation; and finally pass it into the UBF+ biochemical system to make the high-concentration wastewater meet the discharge standards. This process has good treatment effects and low energy consumption and maintenance costs.

Description of the drawings

Figure 1 is a schematic diagram of the process flow of the present invention.

Figure 2 is a schematic structural diagram of the present invention.

In the picture: 1. SBR latex wastewater inlet; 2. SBR latex wastewater collection tank; 3. Aeration pipe; 4. Aeration main pipe; 5. SBR latex wastewater collection tank outlet; 6. Basket filter ; 7. Centrifugal pump; 8. Stirring part; 9. Dosing pipe; 10. Wastewater mixing and stirring vertical flow sedimentation tower; 11. Bracket; 12. Sludge outlet; 13. Sludge tank aeration pipe; 14. Sludge tank ; 15. Sludge outlet; 16. Plate filter press; 17. Collection tank; 18. Wastewater inlet; 19. Centrifugal pump; 20. Stirring motor; 21. Dissolved air flotation; 22. Sludge outlet; 23. Scraping Mud machine; 24. Motor; 25. Air compressor; 26. Stirring motor; 27. Wastewater inlet; 28. UBF reactor; 29. Contact oxidation tank; 30. Acid hydrolysis tank; 31. Activated sludge tank; 32. Sludge outlet; 33. Secondary sedimentation tank; 34. Roots blower.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings.

Referring to Figures 1 and 2, the present invention provides an embodiment: a styrene-butadiene latex wastewater treatment process, including a styrene-butadiene latex wastewater collection tank (2), a wastewater mixing and stirring vertical flow sedimentation tower (10), Mud tank (14), plate filter press (16), dissolved air flotation (21), UBF reactor (28), contact oxidation tank (29), acid hydrolysis tank (30), activated sludge tank (31) , secondary sedimentation tank (33), and Roots blower (34). The specific treatment of styrene-butadiene wastewater production includes the following steps:

Step 1. Pass the styrene-butadiene latex wastewater generated in the production workshop into the styrene-butadiene latex wastewater collection tank (2) and open the aeration pipe (3) for aeration; remove excess functional monomers and pass through the bottom basket filter (6) The waste residue generated during the filtration reaction is then pumped to the bottom of the wastewater mixing and stirring vertical flow sedimentation tower (10) through the centrifugal pump (7);

Step 2. Turn on the motor of the stirring part (8) to stir, and at the same time add FeCl ₃ ferric chloride, NaOH sodium hydroxide, and PAM polyacrylamide through the dosing tube (9) in sequence. During this period, it needs to be adjusted at any time by adjusting the reaction between the wastewater and the drug. After mixing The wastewater flows into the wastewater mixing and stirring vertical flow sedimentation tower (10), and the aeration pipe (13) is opened to mix and react the agent with the styrene-butadiene wastewater again. Finally, the supernatant wastewater flows into the dissolved air flotation (21) stirring motor (26), and the sludge flows Go to the sludge tank (14) to the plate filter press (16) for processing;

Step 3. Turn on the dissolved air flotation (21) stirring motor (26), air compressor (25), and mud scraper (23) to mix the wastewater and the agent again. The air compressor (25) blows air to float the scum. The sludge scraper (23) separates the floating scum, and the dissolved air flotation (21) provides a bottom sludge outlet (22);

Step 4. After the dissolved air flotation (21) treatment, the wastewater is passed into the UBF reactor to generate gas and recycled to the waste gas treatment, and the treated wastewater flows to the contact oxidation tank (29);

Step 5. The biochemical treatment system includes a contact oxidation tank (29), an acidolysis tank (30), and an activated sludge tank (31) for deep biochemical treatment of UBF-treated wastewater. The sludge passes through the sludge outlet (32) and the centrifugal pump. (19) Return to the sludge tank; pass the wastewater treated by the biochemical system into the secondary sedimentation tank (33) for testing, qualified wastewater is discharged to the outside, and unqualified wastewater returns to the UBF reactor (28) and is processed again by the biochemical system Discharge after passing the test.

The inside of the sludge tank (14) is connected to the aeration pipe (13) of the sludge tank to mix the chemical and wastewater again, and the sludge is sent to the plate filter press (16) through the sludge outlet (15) to be pressed into mud blocks. The wastewater separated during this period is discharged to the collection tank (17) and passed into the UBF reactor (28) through the centrifugal pump (18) for treatment.

The outlet of the Roots blower (34) leads to the UBF reactor (28) and the bottom of the biochemical treatment system for 24-hour uninterrupted aeration.

In the present invention, Roots blower, centrifugal pump, UBF reactor, stirring motor, mud scraper, air compressor, dissolved air flotation, contact oxidation tank, acidolysis tank and activated sludge tank are all existing technologies. Technical personnel can already clearly understand this and will not explain it in detail here.

The above are only preferred embodiments of the present invention, and all equivalent changes and modifications made in accordance with the patentable scope of the present invention shall fall within the scope of the present invention.

Claims (8)

1. The process for treating the butyl rubber wastewater is characterized by comprising the following steps of:

step S1, introducing styrene-butadiene latex wastewater generated in a production workshop into a styrene-butadiene latex wastewater collection tank, and simultaneously opening an aeration pipe for aeration;

s2, introducing the aerated styrene-butadiene latex wastewater into a wastewater mixing and stirring vertical flow sedimentation tower from the bottom, and opening a stirring and dosing pipe for mixing;

s3, opening a dissolved air floatation stirring, an air compressor and a mud scraper to separate scum again;

s4, introducing the wastewater into a UBF reactor to generate gas, recovering the gas, treating the gas, conveying sludge to a sludge tank, and flowing the treated wastewater to a biochemical treatment system;

and S5, performing advanced treatment on the wastewater treated by the UBF reactor by the biochemical treatment system, introducing the wastewater treated by the biochemical treatment system into a secondary sedimentation tank to detect qualified wastewater for discharge, and re-treating the unqualified wastewater by a re-refluxing system.

2. The process for treating the styrene-butadiene rubber wastewater according to claim 1, which is characterized in that: and (2) introducing the aeration pipe in the step (S1) into the bottom of a styrene-butadiene latex wastewater collecting tank, wherein a basket filter and a wastewater centrifugal pump are arranged at the water outlet of the styrene-butadiene latex wastewater collecting tank.

3. The process for treating the styrene-butadiene rubber wastewater according to claim 1, which is characterized in that: the waste water mixing stirring vertical flow sedimentation tower in the step S2 is divided into three areas, three motors are used for stirring, three different dosing pipelines are used for leading the waste water treated in the step I into the first area, the stirring part is opened for stirring, and the waste water is simultaneously led into the second area and the third area which are in the same chemical preparation; and introducing the wastewater treated in the third area into a settling tank, allowing scum to sink to the bottom of the tank, pumping the wastewater into a sludge tank, allowing supernatant to flow into a dissolved air floatation tank, and introducing the settling tank into the middle part of aeration.

4. The process for treating the styrene-butadiene rubber wastewater according to claim 1, which is characterized in that: and (3) introducing the supernatant into a vertical flow settling tower through a stirring part for mixing and stirring the wastewater in the step (S3), stirring and mixing again, wherein the treated wastewater flows into an air floatation part, gas generated by an air compressor is introduced into the bottom, a mud scraper is positioned at the top, and a mud outlet is arranged at the bottom of each part and flows to a mud tank.

5. The process for treating the styrene-butadiene rubber wastewater according to claim 1, which is characterized in that: the aeration pipe of the sludge tank is led into the tank bottom, the water outlet of the sludge tank is led into a plate filter press, and the plate filter press is provided with a collecting tank and flows to the UBF reactor through a centrifugal pump.

6. The process for treating the styrene-butadiene rubber wastewater according to claim 1, which is characterized in that: and sludge outlets are arranged at the bottoms of the UBF reactor and the biochemical treatment system and flow to a sludge tank through a centrifugal pump.

7. The process for treating the styrene-butadiene rubber wastewater according to claim 1, which is characterized in that: and (3) introducing the air outlet of the Roots blower into the UBF reactor and the bottom of the biochemical treatment system.

8. The process for treating the styrene-butadiene rubber wastewater according to claim 1, which is characterized in that: the biochemical treatment system comprises a contact oxidation tank, an acidolysis tank and an activated sludge tank, and the wastewater treated by the UBF reactor is subjected to advanced biochemical treatment.