Reaction device for treating DMF (Dimethyl Formamide) wastewater

Abstract

The utility model provides a reaction device for treating DMF (Dimethyl Formamide) wastewater. The reaction device comprises a reaction tank, a first wastewater three-phase separator, a gas-liquid separator, an internal circulation water distribution pipe and a water outlet structure after wastewater treatment. The reaction tank has a reaction cavity; a wastewater injection port is formed in the reaction tank and is communicated with the reaction cavity; the first wastewater three-phase separator is arranged in the reaction cavity; the gas-liquid separator is connected with the first wastewater three-phase separator through a first biogas collecting pipe; the gas-liquid separator is provided with an exhaust port and a waste liquid backflow port, and the exhaust port is used for guiding the biogas from the first wastewater three-phase separator to the external environment; the water inlet end of the internal circulation water distribution pipe is communicated with the waste liquid reflux inlet, and the water outlet end of the internal circulation water distribution pipe is communicated into the reaction cavity; the water inlet end of the post-wastewater-treatment water outlet structure is communicated with the reaction cavity, and the water outlet end of the post-wastewater-treatment water outlet structure extends out of the reaction cavity. The advanced wastewater treatment effect is improved, and the occupied area does not need to be enlarged.

Description

Technical Field

[0001] This application relates to wastewater treatment apparatus, and more particularly to a reaction apparatus for treating DMF wastewater. Background Technology

[0002] DMF (N,N-dimethylformamide) wastewater mainly originates from wastewater generated during the production processes of chemical plants, pharmaceutical factories, and leather processing plants. This wastewater is characterized by high concentrations of organic matter, high COD (chemical oxygen demand), high BOD (biochemical oxygen demand), and high toxicity.

[0003] Currently, the main treatment of DMF wastewater is to simply treat the wastewater with a three-phase separator before discharging it, which makes it difficult for the wastewater to meet standards. If multiple treatment devices are used to treat the wastewater sequentially, the overall equipment with multiple treatment devices will occupy a large area. Utility Model Content

[0004] This application provides a reaction apparatus for treating DMF wastewater to solve the problems existing in related technologies. The technical solution is as follows:

[0005] A reaction apparatus for treating DMF wastewater, comprising:

[0006] A reaction vessel having a reaction chamber; the reaction vessel having a wastewater inlet connected to the reaction chamber;

[0007] The first wastewater three-phase separator is located inside the reaction chamber;

[0008] A gas-liquid separator is connected to a first wastewater three-phase separator via a first biogas collection pipe; the gas-liquid separator has an exhaust port and a wastewater return port, the exhaust port being used to guide biogas from the first wastewater three-phase separator to the external environment.

[0009] An internal circulation water distribution pipe, wherein the inlet end of the internal circulation water distribution pipe is connected to the waste liquid return port, and the outlet end of the internal circulation water distribution pipe is connected to the reaction chamber;

[0010] The wastewater treatment effluent structure has an inlet end connected to the reaction chamber and an outlet end extending outside the reaction chamber.

[0011] In one embodiment, the wastewater inlet is located below the first three-phase wastewater separator, and the inlet of the wastewater treated effluent structure is located above the first three-phase wastewater separator.

[0012] In one embodiment, the wastewater inlet is connected to a first water distributor.

[0013] In one embodiment, the inlet end of the wastewater treatment effluent structure is located above the first three-phase wastewater separator, and the outlet end of the internal circulation water distribution pipe is located below the first three-phase wastewater separator.

[0014] In one embodiment, the outlet end of the internal circulation water distribution pipe is connected to a second water distributor.

[0015] In one embodiment, the reaction device for treating DMF wastewater further includes a second wastewater three-phase separator located inside the reaction chamber and above the wastewater three-phase separator. The second wastewater three-phase separator is connected to a second biogas collection pipe, which is used to divert biogas from the second wastewater three-phase separator to the outside of the reaction chamber.

[0016] In one embodiment, the reaction device for treating DMF wastewater further includes a water seal tank, the exhaust port is connected to the water seal tank, and the second biogas collection pipe is connected to the water seal tank.

[0017] In one embodiment, the reaction device for treating DMF wastewater further includes an external circulation pipe. The inlet end of the external circulation pipe is connected to the reaction chamber and is located between the first three-phase wastewater separator and the second three-phase wastewater separator. The outlet end of the external circulation pipe is connected to the reaction chamber and is located below the first three-phase wastewater separator. An external circulation water pump is connected to the external circulation pipe.

[0018] In one embodiment, the outlet end of the external circulation pipe is connected to a third water distributor.

[0019] In one embodiment, the outlet end of the wastewater treatment effluent structure is connected to an air-lift device.

[0020] The advantages or beneficial effects of the above technical solutions include at least the following:

[0021] 1. Wastewater is contained in the reaction chamber of the reaction tank, allowing for microbial degradation. Microbial degradation is a cost-effective method that aligns with production efficiency. A first-phase wastewater separator separates the components resulting from microbial degradation, preventing large amounts of granular sludge from being discharged outside the reaction chamber and ensuring its degradation capacity. Gas (including biogas and ammonia) from the first-phase wastewater separator is introduced into a gas-liquid separator through an internal circulation distribution pipe, discharging the gas outside the reaction device treating DMF wastewater. The treated wastewater then flows back into the reaction chamber of the reaction tank via the internal circulation distribution pipe for a secondary degradation of DMF, further improving the treatment effect. Finally, the deeply treated wastewater is discharged through the wastewater effluent system.

[0022] 2. In addition, by re-injecting wastewater into the reaction chamber of the reaction tank through the gas-liquid separator and the internal circulation water distribution pipe, the deep treatment effect of wastewater is not only improved, but also the footprint does not need to be expanded.

[0023] The above overview is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features of this application will become readily apparent from the accompanying drawings and the following detailed description. Attached Figure Description

[0024] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the various drawings denote the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings depict only some embodiments disclosed in this application and should not be construed as limiting the scope of this application.

[0025] Figure 1 This is a schematic diagram of a reaction device for treating DMF wastewater according to this application; wherein the arrows indicate the direction of fluid flow.

[0026] Figure 2 for Figure 1 A magnified view of a portion at point A.

[0027] In the diagram, 100 is the reaction tank; 101 is the reaction chamber; 102 is the wastewater inlet; 200 is the first three-phase wastewater separator; 300 is the gas-liquid separator; 301 is the exhaust port; 302 is the wastewater return port; 400 is the first biogas collection pipe; 500 is the internal circulation water distribution pipe; 600 is the wastewater treatment outlet structure; 700 is the first water distributor; 800 is the second water distributor; 900 is the second three-phase wastewater separator; 110 is the second biogas collection pipe; 120 is the water seal tank; 130 is the external circulation pipe; 140 is the external circulation water pump; 150 is the third water distributor; and 160 is the gas lift device. Detailed Implementation

[0028] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of this application. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0029] See Figures 1-2 The present invention illustrates a reaction apparatus for treating DMF wastewater according to a preferred embodiment, comprising: a reaction tank 100, a first wastewater three-phase separator 200, a gas-liquid separator 300, an internal circulation water distribution pipe 500, and a wastewater treatment effluent structure 600.

[0030] The reaction tank 100 has a reaction chamber 101, which is used to contain wastewater and provide reaction space for microbial degradation of wastewater. The reaction tank 100 has a wastewater inlet 102, which is connected to the reaction chamber 101; generally, the wastewater to be degraded can be injected into the wastewater inlet 102 through a pulse water distributor or other conventional water distributor.

[0031] The first wastewater three-phase separator 200 is located inside the reaction chamber 101. According to the function of the wastewater three-phase separator, it can separate sludge, wastewater and gas.

[0032] The gas-liquid separator 300 is connected to the first wastewater three-phase separator 200 through the first biogas collection pipe 400; the gas-liquid separator 300 has an exhaust port 301 and a waste liquid return port 302. The exhaust port 301 is used to guide the biogas from the first wastewater three-phase separator 200 to the external environment, such as to the recycling device.

[0033] The inlet end of the internal circulation water distribution pipe 500 is connected to the waste liquid return port 302, and the outlet end of the internal circulation water distribution pipe 500 is connected to the reaction chamber 101 so that the wastewater treated by the first wastewater three-phase separator 200 is sent back to the reaction chamber 101 for secondary degradation, so as to carry out deep treatment of the wastewater.

[0034] The inlet end of the wastewater treatment effluent structure 600 is connected to the reaction chamber 101, and the outlet end of the wastewater treatment effluent structure 600 extends outside the reaction chamber 101 to discharge the treated wastewater. The wastewater treatment effluent structure 600 can be composed of multiple effluent tanks, or it can be composed of effluent pipes or overflow pipes.

[0035] During operation, wastewater is injected into the reaction chamber 101 through the wastewater inlet 102 via a water distributor (e.g., a pulse-type water distributor) to decompose DMF. To separate the purified wastewater and gas, a first wastewater three-phase separator 200 is used to separate the wastewater and gas. After separation by the first wastewater three-phase separator 200, biogas and ammonia are discharged into the gas-liquid separator 300 through the first biogas collection pipe 400. A mature model of gas-liquid separator can be selected. Under the action of the gas-liquid separator 300, biogas and ammonia are discharged to the external environment or recycled, while wastewater is returned to the reaction chamber 101 through the internal circulation water distribution pipe 500, thereby making the DMF contained in this part more thoroughly decomposed to promote the treatment effect of wastewater.

[0036] It should be noted that the wastewater three-phase separator can separate granular sludge, wastewater, and gas. The granular sludge contains microorganisms, which are used to degrade the wastewater.

[0037] Thus, the wastewater is contained in the reaction chamber 101 of the reaction tank 100, allowing for microbial degradation. Microbial degradation is a cost-effective method that aligns with production efficiency. The first wastewater three-phase separator 200 separates the components after microbial degradation, preventing large amounts of granular sludge from being discharged outside the reaction chamber 101, thereby ensuring the degradation capacity of the reaction chamber 101. Gas (including biogas and ammonia) from the first wastewater three-phase separator 200 is passed through the internal circulation water distribution pipe 500 into the gas-liquid separator 300, thus discharging the gas outside the reaction device treating DMF wastewater. The treated wastewater continues to flow back to the reaction chamber 101 of the reaction tank 100 along the internal circulation water distribution pipe 500 for secondary degradation of DMF in the wastewater, thereby improving the wastewater treatment effect. Finally, the deeply treated wastewater is discharged through the wastewater treatment effluent structure 600. In addition, by re-injecting wastewater into the reaction chamber 101 of the reaction tank 100 through the gas-liquid separator 300 and the internal circulation water distribution pipe 500, the deep treatment effect of wastewater is not only improved, but also the footprint is not increased.

[0038] In one embodiment, the wastewater inlet 102 is located below the first three-phase wastewater separator 200, and the inlet of the wastewater treatment effluent structure 600 is located above the first three-phase wastewater separator 200. This arrangement allows high-concentration DMF to be injected into the bottom of the reaction chamber 101, resulting in a high concentration of both microorganisms and DMF at the bottom of the reaction chamber 101. This also makes it difficult for the wastewater treatment effluent structure 600, located at the top of the reaction chamber 101, to directly discharge the high-concentration DMF, thereby further ensuring the effectiveness of wastewater treatment.

[0039] In one embodiment, in order to uniformly introduce wastewater into the reaction chamber 101, a first water distributor 700 is connected to the wastewater inlet 102. The first water distributor 700 can be a conventional annular water distributor, etc.

[0040] In one embodiment, to allow the wastewater returning to the reaction chamber 101 via the internal circulation water distribution pipe 500 to be further decomposed, the inlet of the wastewater treatment effluent structure 600 is located above the first three-phase wastewater separator 200, and the outlet of the internal circulation water distribution pipe 500 is located below the first three-phase wastewater separator 200. With this configuration, the wastewater passing through the first biogas collection pipe 400 of the first three-phase wastewater separator 200 is not directly discharged but undergoes secondary degradation in the reaction chamber 101. Only the wastewater entering the inlet of the wastewater treatment effluent structure 600 along the height of the reaction chamber 101 is discharged outside the reaction chamber 101. This improves the degradation effect of the wastewater, resulting in a lower DMF concentration in the discharged wastewater.

[0041] In one embodiment, the outlet end of the internal circulation water distribution pipe 500 is connected to a second water distributor 800. The second water distributor 800 can be a conventional ring-shaped water distributor, etc.

[0042] In one embodiment, the reaction device for treating DMF wastewater further includes a second wastewater three-phase separator 900, located inside the reaction chamber 101 and above the first wastewater three-phase separator 200. The second wastewater three-phase separator 900 is connected to a second biogas collection pipe 110, which diverts biogas from the second wastewater three-phase separator 900 to the outside of the reaction chamber 101. This configuration results in a higher DMF concentration in the wastewater below the first wastewater three-phase separator 200, a moderate DMF concentration between the second wastewater three-phase separator 900 and the first wastewater three-phase separator 200, and the lowest DMF concentration above the second wastewater three-phase separator 900. Therefore, after the wastewater is sequentially treated by the first wastewater three-phase separator 200 and the second wastewater three-phase separator 900, the discharge effect is essentially achieved. In particular, the first wastewater three-phase separator 200 and the second wastewater three-phase separator 900 intercept granular sludge, thereby preventing the loss of granular sludge and improving the treatment effect of wastewater, without having to expand the footprint of the reaction unit for treating DMF wastewater.

[0043] In one embodiment, to improve the safety of the gases separated by the first wastewater three-phase separator 200 and the second waste liquid three-phase separator 900, the reaction device for treating DMF wastewater further includes a water seal tank 120. An exhaust port 301 is connected to the water seal tank 120, and a second biogas collection pipe 110 is connected to the water seal tank 120. The gas is filtered through the water seal tank 120 to prevent backfire. The water seal tank 120 can be purchased from existing, mature products.

[0044] In one embodiment, the reaction device for treating DMF wastewater further includes an external circulation pipe 130. The inlet end of the external circulation pipe 130 is connected to the reaction chamber 101 and is located between the first three-phase wastewater separator 200 and the second three-phase wastewater separator 900. The outlet end of the external circulation pipe 130 is connected to the reaction chamber 101 and is located below the first three-phase wastewater separator 200. An external circulation water pump 140 is connected to the external circulation pipe 130. During operation, the external circulation water pump 140 continuously or periodically injects wastewater from the first three-phase wastewater separator 200 and the second three-phase wastewater separator 900 into the bottom of the reaction chamber 101, thereby reducing the concentration of biogas and ammonia at the bottom of the reaction chamber 101 and promoting the generation of biogas and ammonia at the bottom of the reaction chamber 101, which further promotes the degradation of DMF and thus further improves the treatment efficiency of the reaction device for treating DMF wastewater.

[0045] In one embodiment, the outlet end of the external circulation pipe 130 is connected to a third water distributor 150. The third water distributor 150 can be a conventional ring-shaped water distributor, etc.

[0046] In one embodiment, the outlet end of the wastewater treatment effluent structure 600 is connected to an air-lift device 160. The air-lift device 160 further treats the wastewater discharged from the wastewater treatment effluent structure 600 to further meet the discharge requirements.

[0047] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of those different embodiments or examples.

[0048] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0049] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various variations or substitutions within the technical scope disclosed in this application, and these should all be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A reaction apparatus for treating DMF wastewater, characterized in that, include: A reaction vessel having a reaction chamber; the reaction vessel having a wastewater inlet connected to the reaction chamber; The first wastewater three-phase separator is located inside the reaction chamber; A gas-liquid separator is connected to a first wastewater three-phase separator via a first biogas collection pipe; the gas-liquid separator has an exhaust port and a wastewater return port, the exhaust port being used to guide biogas from the first wastewater three-phase separator to the external environment. An internal circulation water distribution pipe, wherein the inlet end of the internal circulation water distribution pipe is connected to the waste liquid return port, and the outlet end of the internal circulation water distribution pipe is connected to the reaction chamber; The wastewater treatment effluent structure has an inlet end connected to the reaction chamber and an outlet end extending outside the reaction chamber.

2. The reaction apparatus for treating DMF wastewater according to claim 1, characterized in that, The wastewater inlet is located below the first three-phase wastewater separator, and the inlet of the wastewater treated effluent structure is located above the first three-phase wastewater separator.

3. The reaction apparatus for treating DMF wastewater according to claim 2, characterized in that, The wastewater inlet is connected to a first water distributor.

4. The reaction apparatus for treating DMF wastewater according to claim 1, characterized in that, The inlet of the wastewater treatment outlet structure is located above the first three-phase wastewater separator, and the outlet of the internal circulation water distribution pipe is located below the first three-phase wastewater separator.

5. The reaction apparatus for treating DMF wastewater according to claim 4, characterized in that, The outlet end of the internal circulation water distribution pipe is connected to a second water distributor.

6. The reaction apparatus for treating DMF wastewater according to claim 1, characterized in that, The reaction device for treating DMF wastewater further includes a second wastewater three-phase separator, which is located inside the reaction chamber and above the reaction chamber. The second wastewater three-phase separator is connected to a second biogas collection pipe, which is used to divert the biogas in the second wastewater three-phase separator to the outside of the reaction chamber.

7. The reaction apparatus for treating DMF wastewater according to claim 6, characterized in that, The reaction device for treating DMF wastewater also includes a water seal tank, the exhaust port is connected to the water seal tank, and the second biogas collection pipe is connected to the water seal tank.

8. The reaction apparatus for treating DMF wastewater according to claim 6, characterized in that, The reaction device for treating DMF wastewater also includes an external circulation pipe. The inlet end of the external circulation pipe is connected to the reaction chamber and is located between the first three-phase wastewater separator and the second three-phase wastewater separator. The outlet end of the external circulation pipe is connected to the reaction chamber and is located below the first three-phase wastewater separator. An external circulation water pump is connected to the external circulation pipe.

9. The reaction apparatus for treating DMF wastewater according to claim 8, characterized in that, The outlet end of the external circulation pipe is connected to a third water distributor.

10. The reaction apparatus for treating DMF wastewater according to claim 1, characterized in that, The outlet end of the wastewater treatment effluent structure is connected to an air-lift device.

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