Recycling system for DMF pure water waste liquid

Abstract

The utility model provides a DMF (Dimethyl Formamide) pure water waste liquid recycling system which comprises an organic wastewater collecting tank, a reverse osmosis raw water lifting pump, a reverse osmosis system security filter, a reverse osmosis high-pressure pump and at least one reverse osmosis membrane component, the reverse osmosis system security filter is connected with a stock solution inlet of the reverse osmosis membrane assembly through a reverse osmosis high-pressure pump, and a trapped fluid outlet of the reverse osmosis membrane assembly is returned and conveyed to the organic wastewater collecting tank through a pipeline; a permeate liquid outlet of the reverse osmosis membrane assembly is connected with a reverse osmosis permeate liquid recycling port, and the organic wastewater collecting tank is also connected with a DMF waste liquid injection port and a concentrated liquid recycling port. According to the utility model, the low-concentration deionized wastewater containing the dimethylformamide is treated through reverse osmosis, and the dimethylformamide and the deionized water in the wastewater are effectively separated, so that a concentrated solution of the dimethylformamide and the deionized water are respectively obtained.

Description

TECHNICAL FIELD

[0001] The utility model relates to wastewater recovery technical field especially DMF pure water waste liquid's recovery treatment system. BACKGROUND

[0002] Organic solvents have been widely used in industry, which has brought a large number of organic wastewater emissions, from the perspective of environmental protection and resource recovery, it is very urgent to harmlessly treat organic wastewater.

[0003] The current traditional organic wastewater recovery is through multi-stage membrane treatment, distillation, catalytic oxidation, resin adsorption and other processes, the treatment links are numerous, the treatment cost is high, and other pollutants are easy to produce; Chinese utility model patent application CN111573950B discloses a kind of recovery treatment method of organic solvent-containing wastewater, the method includes nanofiltration membrane, distillation, resin adsorption, reverse osmosis membrane, molecular sieve rectification;After nanofiltration membrane treatment to organic solvent-containing wastewater, nanofiltration permeate is distilled, volatile components are condensed and rectified, and organic solvent is obtained; after distillation treatment and rectification treatment, water-rich components are treated using adsorption resin, and adsorption effluent is obtained;The method disclosed by the utility model needs to regenerate resin, the treatment cost is high, the applicability is relatively narrow, and is suitable for organic solvent-containing wastewater with high value.

[0004] In the reverse osmosis membrane production process, DMF (dimethylformamide) is used as a water-insoluble polymer solvent, and after the polymer is converted into a polymer base film, it is soaked and stored in deionized water. After the completion of this process step, a mixture of DMF and deionized water is formed. Using conventional recovery methods, the cost is high and the efficiency is low. SUMMARY

[0005] The technical problem to be solved by the embodiments of the utility model lies in providing a DMF pure water waste liquid recovery treatment system to solve the problem of high cost and low efficiency in treating the mixture of DMF and deionized water using conventional recovery methods.

[0006] To solve the above technical problems, the utility model provides a DMF pure water waste liquid recovery treatment system, which comprises: an organic wastewater collection tank, a reverse osmosis raw water lifting pump, a reverse osmosis system security filter, a reverse osmosis high-pressure pump and at least one reverse osmosis membrane assembly. The organic wastewater collection tank is connected to the reverse osmosis system security filter through the reverse osmosis raw water lifting pump. The reverse osmosis system security filter is connected to the raw liquid inlet of the reverse osmosis membrane assembly through the reverse osmosis high-pressure pump. The retentate outlet of the reverse osmosis membrane assembly is connected to the organic wastewater collection tank through a pipeline for backflow delivery. The permeate outlet of the reverse osmosis membrane assembly is connected to the reverse osmosis permeate recycling port. The organic wastewater collection tank is also connected to the DMF waste liquid injection port and the concentrated liquid recycling port.

[0007] The reverse osmosis membrane module has two components, namely a first reverse osmosis membrane module and a second reverse osmosis membrane module, which are connected in parallel.

[0008] A first reverse osmosis membrane permeate sampling valve is installed on the permeate outlet pipe of the first reverse osmosis membrane module for sampling and testing the permeate of the first reverse osmosis membrane module; a second reverse osmosis membrane permeate sampling valve is installed on the permeate outlet pipe of the second reverse osmosis membrane module for sampling and testing the permeate of the second reverse osmosis membrane module.

[0009] The wastewater collection tank is connected to the concentrate return port via a reverse osmosis concentrate booster pump. An inlet valve for the reverse osmosis concentrate booster pump is installed on the upstream pipeline of the pump, and an outlet valve for the pump is installed on the downstream pipeline.

[0010] The upstream pipeline of the reverse osmosis raw water booster pump is equipped with an inlet valve for the reverse osmosis raw water booster pump, and the downstream pipeline is equipped with an outlet valve for the reverse osmosis raw water booster pump.

[0011] The upstream pipeline of the reverse osmosis high-pressure pump is equipped with a reverse osmosis high-pressure pump inlet valve, and the downstream pipeline is equipped with a reverse osmosis high-pressure pump outlet valve.

[0012] The feed inlet of the reverse osmosis membrane module is also connected to the reverse osmosis flushing port, and a reverse osmosis flushing port check valve and a reverse osmosis flushing on / off valve are installed on the pipeline between the feed inlet and the reverse osmosis flushing port of the reverse osmosis membrane module.

[0013] A reverse osmosis permeate control valve is installed on the permeate outlet pipe of the reverse osmosis membrane module, and a reverse osmosis flushing permeate discharge valve is installed on a branch of the permeate outlet pipe of the reverse osmosis membrane module.

[0014] A reverse osmosis retentate control valve is installed on the retentate outlet pipeline of the reverse osmosis membrane module, and a reverse osmosis flushing retentate section discharge valve is installed on a branch of the retentate outlet pipeline of the reverse osmosis membrane module.

[0015] The DMF pure water wastewater recycling system provided by this utility model effectively separates the dimethylformamide and deionized water in the wastewater by reverse osmosis treatment of low-concentration deionized wastewater containing dimethylformamide, obtaining a concentrated dimethylformamide solution and deionized water respectively, so that both dimethylformamide and deionized water can be recycled and reused, with a total recovery rate of over 99%. The DMF pure water wastewater recycling system provided by this utility model has a simple structure, low operating cost, and enables complete recycling of DMF pure water wastewater. Attached Figure Description

[0016] Figure 1The embodiment of the utility model discloses a whole structure schematic diagram.

[0017] In the drawing,

[0018] 1 is the reverse osmosis concentrated water lifting pump outlet valve;2 is the reverse osmosis concentrated water lifting pump;3 is the reverse osmosis concentrated water lifting pump inlet valve;4 is the organic waste water collecting tank;5 is the reverse osmosis raw water lifting pump inlet valve;6 is the reverse osmosis raw water lifting pump;7 is the reverse osmosis raw water lifting pump outlet valve;8 is the reverse osmosis system security filter;9 is the security filter emptying valve;10 is the reverse osmosis high pressure pump inlet valve;11 is the reverse osmosis high pressure pump;12 is the reverse osmosis high pressure pump outlet valve;13 is the reverse osmosis flushing port check valve;14 is the reverse osmosis flushing on-off valve;15 is the reverse osmosis flushing port;16 is the first reverse osmosis membrane assembly;17 is the second reverse osmosis membrane assembly;18 is the first reverse osmosis membrane permeate sampling valve;19 is the second reverse osmosis membrane permeate sampling valve;20 is the reverse osmosis flushing permeate section discharge valve;21 is the reverse osmosis permeate control valve;22 is the reverse osmosis permeate reuse port;23 is the reverse osmosis flushing retentate section discharge valve;24 is the reverse osmosis retentate control valve;25 is the concentrated liquid reuse port;26 is the circulating back liquid port;27 is the DMF waste liquid injection port. DETAILED DESCRIPTION

[0019] In order to make the above-mentioned purpose, features and advantages of the utility model more apparent, below, specific implementation manners of the utility model are explained in detail with the drawings. In the following description, a plurality of specific details are set forth in order to give a full understanding of the utility model. However, the utility model can be implemented in many other ways different from the description herein, and those skilled in the art can make similar improvements without departing from the connotation of the utility model, so the utility model is not limited by the following disclosed specific embodiments.

[0020] It should be noted that when an element is referred to as being "fixed" to another element, it can be directly on the other element or intervening elements can also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements can also be present. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for the purpose of illustration only.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used in the description of the utility model herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0022] As Figure 1As shown, the utility model embodiment provides the utility model provides DMF pure water waste liquid's recovery treatment system, include: organic wastewater collecting tank 4, reverse osmosis raw water booster pump 6, reverse osmosis system security filter 8, reverse osmosis high pressure pump 11 and at least one reverse osmosis membrane assembly, organic wastewater collecting tank 4 is used for collecting DMF pure water waste liquid or other organic waste liquid, reverse osmosis raw water booster pump 6 is used to send DMF pure water waste liquid to reverse osmosis system security filter 8, reverse osmosis system security filter 8 can filter treatment to DMF pure water waste liquid, reverse osmosis high pressure pump 11 is used to send DMF pure water waste liquid to the reverse osmosis membrane assembly, and the reverse osmosis membrane assembly is used to separate treatment to DMF pure water waste liquid, the organic wastewater collecting tank 4 is connected with reverse osmosis system security filter 8 through reverse osmosis raw water booster pump 6, the reverse osmosis system security filter 8 is connected with the raw liquid inlet of reverse osmosis membrane assembly through reverse osmosis high pressure pump 11, and the retained liquid outlet of reverse osmosis membrane assembly is backflowed and is delivered to organic wastewater collecting tank 4 through pipeline, the permeate liquid outlet of reverse osmosis membrane assembly is connected with reverse osmosis permeate liquid reuse mouth 22, and the organic wastewater collecting tank 4 is also connected with DMF waste liquid injection mouth 27 and concentrated liquid reuse mouth 25.DMF waste liquid injection mouth 27 is used to inject DMF pure water waste liquid into organic wastewater collecting tank 4, and concentrated liquid reuse mouth 25 can make DMF pure water waste liquid be concentrated to the set value after the whole recovery treatment system, and the concentrated liquid of DMF pure water waste liquid is discharged (usually is sent to distillation device and is further concentrated).

[0023] The reverse osmosis membrane assembly has two, which are a first reverse osmosis membrane assembly 16 and a second reverse osmosis membrane assembly 17, and the first reverse osmosis membrane assembly 16 and the second reverse osmosis membrane assembly 17 are connected in parallel.

[0024] A first reverse osmosis membrane permeate sampling valve 18 is arranged on the permeate liquid outlet pipeline of the first reverse osmosis membrane assembly 16, and is used for sampling and detecting the permeate liquid of the first reverse osmosis membrane assembly 16; a second reverse osmosis membrane permeate sampling valve 19 is arranged on the permeate liquid outlet pipeline of the second reverse osmosis membrane assembly 17, and is used for sampling and detecting the permeate liquid of the second reverse osmosis membrane assembly 17. The two reverse osmosis membrane permeate sampling valves 18 can detect the purity of the permeate liquid of the reverse osmosis membrane assembly 16 at any time, and provide sampling data for the control center.

[0025] The machine wastewater collecting tank 4 is connected with the concentrated liquid recycling port 25 through the reverse osmosis concentrated water lifting pump 2, and the reverse osmosis concentrated water lifting pump inlet valve 3 is arranged on the upstream pipeline of the reverse osmosis concentrated water lifting pump 2, and the reverse osmosis concentrated water lifting pump outlet valve 1 is arranged on the downstream pipeline.

[0026] The upstream pipeline of the reverse osmosis raw water lifting pump 6 is provided with the reverse osmosis raw water lifting pump inlet valve 5, and the downstream pipeline is provided with the reverse osmosis raw water lifting pump outlet valve 7. The reverse osmosis raw water lifting pump inlet valve 5 and the reverse osmosis raw water lifting pump outlet valve 7 can cooperate with the reverse osmosis raw water lifting pump 6 to work.

[0027] The upstream pipeline of the reverse osmosis high-pressure pump 11 is provided with the reverse osmosis high-pressure pump inlet valve 10, and the downstream pipeline is provided with the reverse osmosis high-pressure pump outlet valve 12. The reverse osmosis high-pressure pump inlet valve 10 and the reverse osmosis high-pressure pump outlet valve 12 can cooperate with the reverse osmosis high-pressure pump 11 to work.

[0028] The raw liquid inlet of the reverse osmosis membrane assembly is also connected with the reverse osmosis flushing port 15, and the reverse osmosis flushing port check valve 13 and the reverse osmosis flushing on-off valve 14 are arranged on the pipeline between the raw liquid inlet of the reverse osmosis membrane assembly and the reverse osmosis flushing port 15. The reverse osmosis flushing port 15 is used to be connected with an external backwashing device, so that the external backwashing liquid enters the reverse osmosis membrane assembly, thereby performing reverse cleaning treatment on the reverse osmosis membrane in the reverse osmosis membrane assembly. In order to avoid the backwashing process of the cleaning liquid backflow, the reverse osmosis flushing port check valve 13 and the reverse osmosis flushing on-off valve 14 are arranged on the pipeline, so as to ensure the stability of the backwashing process.

[0029] The reverse osmosis permeate liquid control valve 21 is arranged on the permeate liquid outlet pipeline of the reverse osmosis membrane assembly, and the reverse osmosis flushing permeate liquid section discharge valve 20 is arranged on the branch of the permeate liquid outlet pipeline of the reverse osmosis membrane assembly. The reverse osmosis permeate liquid control valve 21 can control the flow of the reverse osmosis permeate liquid in the pipeline; the reverse osmosis flushing permeate liquid section discharge valve 20 can discharge the reverse osmosis permeate liquid.

[0030] The reverse osmosis retained liquid control valve 24 is arranged on the retained liquid outlet pipeline of the reverse osmosis membrane assembly, and the reverse osmosis flushing retained liquid section discharge valve 23 is arranged on the branch of the retained liquid outlet pipeline of the reverse osmosis membrane assembly.

[0031] The embodiment provides a DMF pure water waste liquid recycling treatment system, and the working process of the system comprises the following steps:

[0032] (1) Collecting DMF pure water waste liquid through the organic wastewater collecting tank 4, wherein the DMF pure water waste liquid is composed of 1-10wt% dimethylacetamide and pure water, and is derived from a reverse osmosis membrane production workshop;

[0033] (2) the wastewater in step (1) is pumped into the first reverse osmosis membrane assembly 16 and the second reverse osmosis membrane assembly 17 by the reverse osmosis raw water lifting pump 6 and the reverse osmosis high-pressure pump 11, the initial operating pressure of the reverse osmosis membrane assembly is 1.0 MPa, and the temperature is 25 DEG C, and the reverse osmosis membrane permeate and the retained liquid are obtained;

[0034] (3) the permeate in step (2) is reused, the retained liquid is returned to the organic wastewater collecting tank 4 and then recycled into the reverse osmosis membrane assembly, the operating pressure at this time is 1.8 MPa, and the temperature is 25 DEG C, the reverse osmosis membrane permeate is reused, and the retained liquid is continuously recycled and treated;

[0035] (4) through repeating step (3), the operating pressure of the final reverse osmosis membrane system is 4.6 MPa, the temperature is 25 DEG C, the reverse osmosis membrane permeate is reused, and the retained liquid is accumulated in the collecting tank, at this time, the mass fraction of dimethylacetamide in the retained liquid is 10-20 wt%, and the retained liquid is lifted to the production workshop by the reverse osmosis membrane retained liquid lifting pump 2.

[0036] After the above treatment, the organic components in the wastewater can be fully recovered, and the total recovery rate is more than 99%;

[0037] The DMF pure water waste liquid recycling system provided by the utility model can effectively separate dimethylformamide and deionized water in the wastewater containing dimethylformamide through reverse osmosis treatment, and concentrated dimethylformamide liquid and deionized water are obtained, so that the dimethylformamide and the deionized water can be recycled, and the total recovery rate can be more than 99%.

[0038] The technical features of the above-described embodiments can be combined in any manner, and to make the description concise, all possible combinations of the technical features in the above-described embodiments are not described, however, as long as the combinations of the technical features do not exist contradictions, they should be considered as the scope of the description.

[0039] The above-described embodiments only express several implementation manners of the utility model, the description is more specific and detailed, however, it should not be understood as the limitation of the scope of the utility model patent. It should be pointed out that for ordinary skilled persons in the art, on the premise of not departing from the concept of the utility model, a plurality of modifications and improvements can be made, which belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent should be subject to the appended claims.

Claims

1. A system for recovering and treating DMF aqueous waste liquid, characterized by comprising: The application relates to a reverse osmosis system for treating organic wastewater, which comprises an organic wastewater collecting tank (4), a reverse osmosis raw water lifting pump (6), a reverse osmosis system security filter (8), a reverse osmosis high-pressure pump (11) and at least one reverse osmosis membrane assembly, wherein the organic wastewater collecting tank (4) is connected with the reverse osmosis system security filter (8) through the reverse osmosis raw water lifting pump (6), the reverse osmosis system security filter (8) is connected with the raw liquid inlet of the reverse osmosis membrane assembly through the reverse osmosis high-pressure pump (11), the retained liquid outlet of the reverse osmosis membrane assembly is delivered back to the organic wastewater collecting tank (4) through a pipeline, the permeated liquid outlet of the reverse osmosis membrane assembly is connected with a reverse osmosis permeated liquid recycling port (22), and the organic wastewater collecting tank (4) is also connected with a DMF waste liquid injection port (27) and a concentrated liquid recycling port (25). The reverse osmosis membrane assembly has two, namely a first reverse osmosis membrane assembly (16) and a second reverse osmosis membrane assembly (17), and the first reverse osmosis membrane assembly (16) and the second reverse osmosis membrane assembly (17) are connected in parallel.

2. The DMF pure water waste liquid recovery processing system according to claim 1, characterized in that, A first reverse osmosis membrane permeated liquid sampling valve (18) is arranged on the permeated liquid outlet pipeline of the first reverse osmosis membrane assembly (16) and used for sampling and detecting the permeated liquid of the first reverse osmosis membrane assembly (16); a second reverse osmosis membrane permeated liquid sampling valve (19) is arranged on the permeated liquid outlet pipeline of the second reverse osmosis membrane assembly (17) and used for sampling and detecting the permeated liquid of the second reverse osmosis membrane assembly (17).

3. The DMF pure water waste liquid recovery processing system according to claim 2, characterized in that, The organic wastewater collecting tank (4) is connected with the concentrated liquid recycling port (25) through a reverse osmosis concentrated water lifting pump (2), a reverse osmosis concentrated water lifting pump inlet valve (3) is arranged on the upstream pipeline of the reverse osmosis concentrated water lifting pump (2), and a reverse osmosis concentrated water lifting pump outlet valve (1) is arranged on the downstream pipeline.

4. The DMF pure water waste liquid recovery processing system according to claim 1, characterized in that, A reverse osmosis raw water lifting pump inlet valve (5) is arranged on the upstream pipeline of the reverse osmosis raw water lifting pump (6), and a reverse osmosis raw water lifting pump outlet valve (7) is arranged on the downstream pipeline.

5. The DMF pure water waste liquid recovery processing system according to claim 1, characterized in that, A reverse osmosis high-pressure pump inlet valve (10) is arranged on the upstream pipeline of the reverse osmosis high-pressure pump (11), and a reverse osmosis high-pressure pump outlet valve (12) is arranged on the downstream pipeline.

6. The DMF pure water waste liquid recovery processing system according to claim 1, characterized in that, The raw liquid inlet of the reverse osmosis membrane assembly is also connected with a reverse osmosis flushing port (15), a reverse osmosis flushing check valve (13) and a reverse osmosis flushing on-off valve (14) are arranged on the pipeline between the raw liquid inlet of the reverse osmosis membrane assembly and the reverse osmosis flushing port (15).

7. The DMF pure water waste liquid recovery processing system according to claim 1, characterized in that, A reverse osmosis permeated liquid control valve (21) is arranged on the permeated liquid outlet pipeline of the reverse osmosis membrane assembly, and a reverse osmosis flushing permeated liquid section discharge valve (20) is arranged on the branch of the permeated liquid outlet pipeline of the reverse osmosis membrane assembly.

8. The DMF pure water waste liquid recovery processing system according to claim 1, characterized in that, A reverse osmosis retained liquid control valve (24) is arranged on the retained liquid outlet pipeline of the reverse osmosis membrane assembly, and a reverse osmosis flushing retained liquid section discharge valve (23) is arranged on the branch of the retained liquid outlet pipeline of the reverse osmosis membrane assembly.

9. The DMF pure water waste liquid recovery processing system according to claim 1, characterized in that, ​

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