CN211339095U

CN211339095U - System for recycling acrylamide production wastewater for producing papermaking dry strength agent

Info

Publication number: CN211339095U
Application number: CN201922032712.2U
Authority: CN
Inventors: 张虎寅; 庄贤军
Original assignee: Zhejiang Xinyong Biological Chemical Co ltd
Current assignee: Zhejiang Xinyong Biological Chemical Co ltd
Priority date: 2019-11-22
Filing date: 2019-11-22
Publication date: 2020-08-25
Anticipated expiration: 2029-11-22

Abstract

The utility model discloses a system for acrylamide waste water is recycled to be used for producing papermaking dry strength agent, including sewage case, filter house, retrieval and utilization water tank, sewage case, filter house, retrieval and utilization water tank link to each other in proper order, a serial communication port, the filter house is including coagulating portion, sedimentation tank, clean water jar, sand filter tank, coagulating portion, sedimentation tank, clean water jar, sand filter tank link to each other in proper order. The method comprises the steps of reducing the chromaticity of sewage to below 3 ℃ after oxidizing, decolorizing, flocculating, precipitating and filtering the wastewater produced by acrylamide, separating and removing insoluble solids such as protein and the like, and reusing the insoluble solids in water for producing dry strength agent; the problem of water consumption of the dry strength agent is solved, the sewage treatment cost is also solved, and the method has great economic value and social value; meanwhile, the recycled water is used as the water for producing the dry strength agent, and the water contains part of acrylamide and ions, so that the performance of the synthesized dry strength agent is better than that of the dry strength agent made of pure water.

Description

System for recycling acrylamide production wastewater for producing papermaking dry strength agent

Technical Field

The utility model relates to the technical field of wastewater treatment, in particular to a system for reusing acrylamide production wastewater to produce papermaking dry strength agent.

Background

Dry strength agents are an important class of chemicals in the paper industry to increase paper strength, and are commonly used to compensate for the decrease in paper strength caused by the addition of fillers or low grade fibers (e.g., recycled fibers). Most of the dry strength agents on the market at present are prepared by polymerizing acrylamide and various small materials.

The main components of the wastewater produced by the biological method of acrylamide comprise acrylamide, partial anions and cations, pigments, proteins and solid impurities, the conventional method of the wastewater is to discharge the wastewater after biochemical treatment, and the treatment of the wastewater requires a large amount of economic cost and wastes a large amount of resources.

Disclosure of Invention

The utility model discloses the technical problem that will solve is: the system can recover the wastewater generated by producing acrylamide, remove solid impurities such as pigment, protein and the like in the acrylamide wastewater, and enable the wastewater to be used as a synthetic component of a dry strength agent and be reused as the acrylamide production wastewater of process water for producing the dry strength agent for producing papermaking.

The utility model adopts the technical proposal that: the utility model provides a system for acrylamide waste water is retrieved and is used for producing papermaking dry strength agent, includes sewage case, filter house, retrieval and utilization water tank, sewage case, filter house, retrieval and utilization water tank link to each other in proper order, its characterized in that, the filter house is including coagulating portion, sedimentation tank, clean water jar, sand filtration jar, coagulating portion, sedimentation tank, clean water jar, sand filtration jar link to each other in proper order.

After the structure more than adopting, the utility model discloses a system that acrylamide waste water was reused in production papermaking dry strength agent compares with prior art and has following advantage: the method comprises the steps of reducing the chromaticity of sewage to below 3 ℃ after oxidizing, decolorizing, flocculating, precipitating and filtering the wastewater produced by acrylamide, separating and removing insoluble solids such as protein and the like, and reusing the insoluble solids in water for producing dry strength agent; the problem of water consumption of the dry strength agent is solved, the sewage treatment cost is also solved, and the method has great economic value and social value; meanwhile, the recycled water is used as the water for producing the dry strength agent, and the water contains part of acrylamide and ions, so that the performance of the synthesized dry strength agent is better than that of the dry strength agent made of pure water.

Preferably, the coagulation part comprises a first coagulation tank, a second coagulation tank and a third coagulation tank, wherein the first coagulation tank is internally provided with an acid-base tank and a decolorant tank, the second coagulation tank is internally provided with a PAC tank, the third coagulation tank is internally provided with a PAM tank, and the first coagulation tank, the second coagulation tank and the third coagulation tank are sequentially connected. The first coagulation tank is used for adjusting the pH value of the acrylamide production wastewater and carrying out oxidation decoloration by using a decolorant; the second coagulation tank is used for carrying out PAC coagulation on the acrylamide production wastewater; and the third coagulation tank is used for performing PAM flocculation on the acrylamide production wastewater.

Preferably, the acid-base tank is connected with a first metering pump, the decolorizing agent tank is connected with a second metering pump, the PAC tank is connected with a third metering pump, and the PAM tank is connected with a fourth metering pump. The first metering pump is used for controlling the dosage of the solution in the acid-base tank, so that the PH of the acrylamide production wastewater can be well adjusted to 6.5-8.5; the second metering pump is used for controlling the using amount of the solution in the decoloring agent tank and reducing the chroma of the wastewater to be below 3 ℃; the third metering pump is used for controlling the using amount of the solution in the PAC tank, so that the coagulation effect of the wastewater is ensured; the fourth metering pump is used for controlling the using amount of the solution in the PAM tank, so that the flocculation effect of the wastewater is ensured; the metering pump ensures accurate dosage of various solutions, and the acrylamide production wastewater is well treated.

Preferably, the upper part of the sedimentation tank is provided with a first outlet, and the first outlet is connected with the clean water tank. The waste water in the sedimentation tank is settled, and the clear liquid flows to the clear water tank through the first outlet on the upper layer of the sedimentation tank.

Preferably, a second outlet is formed in the bottom of the sedimentation tank, a second pump is connected to the second outlet, the second pump is connected with a filter press, the filter press is connected with a sewage ditch and a clean water tank, and the clean water tank is connected with the clean water tank through a third pump. And precipitating the wastewater in the sedimentation tank, precipitating the concentrated solution to the bottom of the sedimentation tank, conveying the concentrated solution to a filter press for filter pressing under the action of a second pump, collecting clear solution obtained after filter pressing to a clear water tank, and discharging the residual waste solution to a sewage ditch.

Preferably, the acid-base tank is an acidic solution or an alkaline solution. When the sewage is acidic, the sewage is adjusted by an alkaline solution, and when the sewage is alkaline, the sewage is adjusted by an acidic solution, so that the pH value of the sewage is adjusted to 6.5-8.5.

Preferably, the decoloring agent tank is filled with a reductive decoloring agent, and the concentration of the decoloring agent is 1-3%. The concentration of the decolorant solution is limited, and the good decoloration effect of the wastewater is ensured.

Preferably, the concentration of the PAC solution in the PAC tank is 1 to 4%. The concentration of the PAC solution is limited, and the coagulation effect of the wastewater solution is ensured to be good.

Preferably, the concentration of the PAM solution in the PAM tank is 1-2 per mill. The concentration of the PAM solution is limited, and the flocculation effect of the wastewater solution is ensured to be good.

Preferably, the sand filtering tank is connected with the sewage tank. The sand filtration tank is connected with the sewage tank, when the sand filtration tank is backflushed, the backflush water of the sand filtration tank is communicated back to the sewage tank, and the sand filtration tank can be treated again, so that waste is reduced.

Drawings

FIG. 1 is a schematic structural diagram of a system for recycling acrylamide production wastewater to produce papermaking dry strength agent.

Wherein, 1, a sewage tank; 2. a sewage ditch; 3. a first pump; 4. a coagulation section; 4.1, a first coagulation tank; 4.2, a second coagulation tank; 4.3, a third coagulation tank; 5. a sedimentation tank; 5.1, a first outlet; 5.2, a second outlet; 6. a second pump; 7. a filter press; 8. a clean water tank; 9. a third pump; 10. a clean water tank; 11. a fourth pump; 12. a sand filtration tank; 13. a recycling water tank; 14; a fifth pump; 15. an acid-base tank; 16. a decolorant tank; 17. a PAC tank; 18. a PAM tank; 19. a first metering pump; 20. a second metering pump; 21. a third metering pump; 22. and a fourth metering pump.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and the following detailed description.

The utility model provides a system for reusing acrylamide production wastewater to produce papermaking dry strength agent, which comprises a sewage tank 1, a filtering part and a reuse water tank 13, wherein the filtering part comprises a coagulation part 4, a sedimentation tank 5, a clean water tank 10 and a sand filter tank 12; the sewage tank 1 is connected with the coagulation part 4 through the first pump 3, the coagulation part 4 is connected with the sedimentation tank 5, a first outlet 5.1 of the sedimentation tank 5 is connected with the clean water tank 10, a second outlet 5.1 of the sedimentation tank 5 is connected to the filter press 7 through the second pump 6, the filter press 7 is respectively connected with the sewage ditch 2 and the clean water tank 8, the clean water tank 8 is connected with the clean water tank 10 through the third pump 9, the clean water tank 10 is connected with the sand filter tank 12 through the fourth pump 11, and the sand filter tank 12 is connected with the reuse water tank 13.

The acid-base tank 15 is connected with the first coagulation tank 4.1 through a first metering pump 19, the decolorant tank 16 is connected with the first coagulation tank 4.1 through a second metering pump 20, the PAC tank 17 is connected with the second coagulation tank 4.2 through a third metering pump 21, and the PAM tank 18 is connected with the third coagulation tank 4.3 through a fourth metering pump 22.

The working principle is that the acrylamide production wastewater is continuously conveyed to a coagulation part 4 through a first pump 3 in a sewage tank 1, sequentially passes through a first coagulation tank 4.1, a second coagulation tank 4.2 and a third coagulation tank 4.3, and the pH value and the chromaticity of the wastewater are adjusted under the action of an acid-base tank 15 and a decolorant tank 16, so that the pH value of the wastewater reaches 6.5-8.5, and the chromaticity of the wastewater is reduced to be below 3 ℃; coagulating the PAC under the action of a PAC tank 17; it was flocculated by the action of a PAM tank 18. The wastewater which passes through the coagulation part 4 enters the sedimentation tank 5 for sedimentation, the clear wastewater which is sedimentated overflows to a clear water tank 10 through a first outlet 5.1 at the upper layer, the concentrated solution at the lower layer is delivered to a filter press 7 for filter pressing under the action of a second pump 6, the clear water after filter pressing is collected in a clear water tank 8 and is delivered to the clear water tank 10 through a third pump 9, and the rest waste liquid is poured into a sewage ditch 2. The clear liquid in the clear water tank 10 is acted by a fourth pump 11, conveyed into a sand filter tank 12 for filtering, and the filtrate is collected into a reuse water tank 13, so that the clear liquid can be conveyed to a dry strength agent workshop for use through a fifth pump 14.

In this embodiment, when the PH of the wastewater is acidic, a 30% liquid caustic soda solution is used in the acid-base tank 15; when the pH of the wastewater is alkaline, a 15% hydrochloric acid solution is used in the acid-base tank 15 to adjust the pH of the wastewater to 6.5-8.5, preferably to neutral 7. A reducing decolorant is selected from a decolorant tank 16, the decolorant is prepared into a solution with the concentration of 2 percent, and the adding amount of the decolorant solution is 0.5 to 5 percent, in the embodiment, 2 percent; PAC solution in the PAC tank 17 is prepared to have the concentration of 2 percent, and the adding amount of the PAC solution is 3 to 10 percent and is 5 percent in the embodiment; the PAM solution in the PAM tank 18 was prepared to a concentration of 1% o, and the amount of the PAM solution added was 1 to 3%, in this example 2%. After the water quality is changed, the adding amount needs to be determined by a small test, and the decolorizing and flocculating settling effects are taken as the standard.

The number of the sewage tanks 1 is at least one, and two sewage tanks can be arranged, and the sewage tanks can be alternately used.

The backwash water of the sand filtration tank 12 can be returned to the sewage tank 1 for treatment again, avoiding waste.

While the above is directed to the preferred embodiment of the present invention, it is not intended that it be limited, except as by the appended claims. The present invention is not limited to the above embodiments, and the specific structure thereof allows for changes, all the changes made within the protection scope of the independent claims of the present invention are within the protection scope of the present invention.

Claims

1. The utility model provides a system for acrylamide waste water is retrieved and is used for producing papermaking dry strength agent, includes sewage case (1), filter house, retrieval and utilization water tank (13), sewage case (1), filter house, retrieval and utilization water tank (13) link to each other in proper order, its characterized in that, the filter house is including coagulating part (4), sedimentation tank (5), clean water jar (10), sand filtration jar (12), coagulating part (4), sedimentation tank (5), clean water jar (10), sand filtration jar (12) link to each other in proper order.

2. The system for recycling the acrylamide production wastewater for producing the papermaking dry strength agent according to claim 1, wherein the coagulation part (4) comprises a first coagulation tank (4.1), a second coagulation tank (4.2) and a third coagulation tank (4.3), an acid-base tank (15) and a decolorant tank (16) are arranged in the first coagulation tank (4.1), a PAC tank (17) is arranged in the second coagulation tank (4.2), a PAM tank (18) is arranged in the third coagulation tank (4.3), and the first coagulation tank (4.1), the second coagulation tank (4.2) and the third coagulation tank (4.3) are sequentially connected.

3. The system for recycling the wastewater generated in the acrylamide production process for producing the dry strength agent for papermaking as claimed in claim 2, wherein the acid-base tank (15) is connected with a first metering pump (19), the decolorant tank (16) is connected with a second metering pump (20), the PAC tank (17) is connected with a third metering pump (21), and the PAM tank (18) is connected with a fourth metering pump (22).

4. The system for recycling the acrylamide production wastewater for producing the papermaking dry strength agent according to the claim 1, characterized in that the upper part of the sedimentation tank (5) is provided with a first outlet (5.1), and the first outlet (5.1) is connected with the clean water tank (10).

5. The system for recycling the wastewater generated in the acrylamide production process for producing the dry strength agent for papermaking according to claim 4, wherein a second outlet (5.2) is formed in the bottom of the sedimentation tank (5), the second outlet (5.2) is connected with a second pump (6), the second pump (6) is connected with a filter press (7), the filter press (7) is connected with a sewage ditch (2) and a clean water tank (8), and the clean water tank (8) is connected with the clean water tank (10) through a third pump (9).

6. The system for recycling the acrylamide production wastewater for producing the papermaking dry strength agent according to the claim 2, characterized in that the acid-base tank (15) is an acidic solution or an alkaline solution.

7. The system for recycling the acrylamide production wastewater for producing the papermaking dry strength agent as claimed in claim 2, wherein a reductive decolorizing agent is contained in the decolorizing agent tank (16), and the decolorizing agent concentration is 1-3%.

8. The system for recycling acrylamide production wastewater for producing papermaking dry strength agent as claimed in claim 2, wherein the concentration of PAC solution in the PAC tank (17) is 1-4%.

9. The system for recycling the wastewater generated in the acrylamide production for producing the dry strength agent for papermaking as claimed in claim 2, wherein the concentration of the PAM solution in the PAM tank (18) is 1-2 ‰.

10. The system for recycling the acrylamide production wastewater for producing papermaking dry strength agent as recited in claim 1, wherein the sand filtration tank (12) is connected with the sewage tank (1).