IC (internal circulation) anaerobic reactor for PTA (pure terephthalic acid) production wastewater treatment

Abstract

The utility model discloses an IC (internal circulation) anaerobic reactor for PTA (pure terephthalic acid) production wastewater treatment, which relates to the technical field of wastewater treatment and comprises a tank body, a first reaction area and a second reaction area are respectively arranged in the tank body, two three-phase separators are fixedly connected in the tank body, a gas-liquid separation tank is fixedly connected to the top of the tank body, and a gas-liquid separation tank is fixedly connected to the bottom of the tank body. Two corresponding second reaction chamber lifting pipes are fixedly connected to the interior of the gas-liquid separation tank, one end of each second reaction chamber lifting pipe extends into the tank body and is located above one of the three-phase separators, and two first reaction chamber lifting pipes are fixedly connected to the interior of the gas-liquid separation tank; the utility model has the beneficial effects that the guide plate guides the methane to be discharged upwards, the liquid phase settles downwards, and the solid phase is left in the separation area, so that the separation effect is further improved, and the outer circulating pipe can enable the mixed liquid in the second reaction area to flow back to the first reaction area, so that the treatment capacity and the stability of the reactor are enhanced.

Description

Technical Field

[0001] The utility model relates to the technical field of wastewater treatment, in particular to an IC anaerobic reactor for treating PTA production wastewater. Background Technique

[0002] The high-concentration organic wastewater generated in the production process of PTA (purified terephthalic acid) has the characteristics of high pollutant concentration and difficult biodegradation. Therefore, wastewater treatment has become an important link that cannot be ignored in the PTA production process.

[0003] Traditional sewage treatment methods are difficult to meet the environmental protection requirements. The IC anaerobic reactor is a highly efficient anaerobic treatment device, and its volumetric load is about 4 times that of the ordinary upflow anaerobic sludge reactor (UASB). It has the advantages of high treatment efficiency and small floor area, and has been widely used in the treatment of high-concentration organic wastewater and has become an important equipment in PTA wastewater treatment. However, there are some deficiencies in the design of the water distribution system and the three-phase separator of the traditional IC anaerobic reactor. When treating the production wastewater of the chemical fiber industry, problems such as uneven water distribution and poor three-phase separation effect are likely to occur. For this reason, we propose an IC anaerobic reactor for treating PTA production wastewater. Content of the Utility Model

[0004] Aiming at the deficiencies of the prior art, the utility model provides an IC anaerobic reactor for treating PTA production wastewater, and solves the problems put forward in the above background technique.

[0005] To achieve the above purposes, the utility model is realized through the following technical solutions: an IC anaerobic reactor for treating PTA production wastewater, including a tank body, the interior of the tank body is respectively provided with a first reaction zone and a second reaction zone, two three-phase separators are fixedly connected inside the tank body, a gas-liquid separation tank is fixedly connected to the top of the tank body, two corresponding second reaction chamber risers are fixedly connected inside the gas-liquid separation tank, one end of the second reaction chamber riser extends into the interior of the tank body and is located above one of the three-phase separators, two first reaction chamber risers are fixedly connected inside the gas-liquid separation tank, the first reaction chamber riser extends into the interior of the tank body and is located above the other three-phase separator, a water collecting tank is arranged inside the tank body, an internal circulation pipe is fixedly connected inside the gas-liquid separation tank, one end of the internal circulation pipe extends into the interior of the tank body, four corresponding water inlet branch pipes are fixedly connected inside the tank body, and a plurality of jet pipes are fixedly connected inside both the water inlet branch pipe and the internal circulation pipe.

[0006] Preferably, a multi-layer conical separator is arranged inside the three-phase separator. The conical separator is composed of a separation plate and a diversion plate. Through the multi-layer conical separator, gas-liquid separation can be carried out, effectively reducing the phenomenon of biogas entraining liquid phase. The biogas is guided upward to be discharged through the diversion plate, the liquid phase settles downward, and the solid phase remains in the separation area, further improving the separation effect.

[0007] Preferably, a drain pipe is fixedly connected inside the water collecting tank, and one end of the drain pipe extends to the outside of the tank body.

[0008] Preferably, a water inlet main pipe is fixedly connected to the outside of the four water inlet branch pipes, and a water inlet lift pump is arranged on the outside of the water inlet main pipe.

[0009] Preferably, an external circulation pipe is fixedly connected inside the water inlet main pipe, and the other end of the external circulation pipe extends to the inside of the tank body.

[0010] Preferably, I-beams are fixedly connected inside the tank body, and the water collecting tank is fixedly connected to the top of the I-beams.

[0011] Preferably, butterfly valves are arranged on the outside of the external circulation pipe, the water inlet main pipe and the water inlet branch pipes.

[0012] Preferably, a sampling pipe is fixedly connected inside the tank body, and a pipe plug is arranged on the outside of the internal circulation pipe.

[0013] The utility model provides an IC anaerobic reactor for treating PTA production wastewater, which has the following

[0014] Beneficial effects:

[0015] 1. The IC anaerobic reactor for treating PTA production wastewater has 4 inlet branch pipes separated from the main inlet pipe, which are distributed perpendicular to each other at the bottom of the tank body. The inlet branch pipes are arranged with jet pipes on one side along the water flow direction, and are arranged from the tank wall to the center in a sparse-to-dense pattern. The internal circulation pipe also branches out 4 perpendicular pipes, which are arranged alternately with the inlet branch pipes. The branch pipes are also arranged with jet pipes on one side along the water flow direction, and are arranged from the tank wall to the center in a dense-to-sparse pattern to fully stir the mixed liquid at the bottom of the tank, ensuring that the wastewater enters the reaction zone evenly. Each inlet branch pipe is equipped with a butterfly valve, which can adjust the opening of the water distribution port according to the changes in the wastewater flow rate and load, realizing flexible water distribution. Through the mutual cooperation of the three-phase separator, the conical separator separation plate and the guide plate, gas-liquid separation can be carried out, effectively reducing the phenomenon of biogas entraining liquid phase. The guide plate guides the biogas to discharge upward, the liquid phase settles downward, and the solid phase remains in the separation zone, further improving the separation effect. The external circulation pipe can return the mixed liquid in the second reaction zone to the first reaction zone, enhancing the treatment capacity and stability of the reactor, thereby increasing the upward flow rate in the first reaction zone. The IC anaerobic reactor for treating PTA production wastewater has been innovatively improved in the design of the water distribution system and the three-phase separator, significantly improving the efficiency and stability of treating PTA production process wastewater, and having broad application prospects. Description of the Drawings

[0016] Figure 1 It is a schematic structural diagram of the present utility model;

[0017] Figure 2 It is a schematic diagram of the bottom water distribution of the present utility model;

[0018] Figure 3 It is a schematic plan view of the collecting tank of the present utility model.

[0019] In the figure: 1. Tank body; 2. Gas-liquid separation tank; 3. Three-phase separator; 4. Separation plate; 5. Guide plate; 6. Internal circulation pipe; 7. First reaction chamber riser; 8. Second reaction chamber riser; 9. Collecting tank; 10. Drain pipe; 11. External circulation pipe; 12. Main inlet pipe; 13. Inlet lift pump; 14. I-beam; 15. Butterfly valve; 16. Sampling pipe; 17. Pipe plug; 18. Inlet branch pipe; 19. Jet pipe; 20. First reaction zone; 21. Second reaction zone; 22. Conical separator. Detailed Embodiments

[0020] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments.

[0021] Please refer to Figures 1 to 3, the present utility model provides a technical solution: an IC anaerobic reactor for treating PTA production wastewater, including a tank body 1. Inside the tank body 1, a first reaction zone 20 and a second reaction zone 21 are respectively arranged. Two three-phase separators 3 are fixedly connected inside the tank body 1. A gas-liquid separation tank 2 is fixedly connected to the top of the tank body 1. Two corresponding second reaction chamber risers 8 are fixedly connected inside the gas-liquid separation tank 2. One end of the second reaction chamber riser 8 extends into the tank body 1 and is located above one of the three-phase separators 3. Two first reaction chamber risers 7 are fixedly connected inside the gas-liquid separation tank 2. The first reaction chamber riser 7 extends into the tank body 1 and is located above the other three-phase separator 3. A water collecting tank 9 is arranged inside the tank body 1. An internal circulation pipe 6 is fixedly connected inside the gas-liquid separation tank 2. One end of the internal circulation pipe 6 extends to the bottom of the tank body 1. Four corresponding water inlet branch pipes 18 are fixedly connected inside the tank body 1. A plurality of jet pipes 19 are fixedly connected inside both the water inlet branch pipes 18 and the internal circulation pipe 6;

[0022] Inside the three-phase separator 3, multiple layers of conical separators 22 are arranged. The conical separator (22) is composed of a separation plate 4 and a diversion plate 5. Through the conical separator 22, gas-liquid separation can be carried out, effectively reducing the phenomenon of biogas entraining liquid phase. Through the diversion plate 5, the biogas is guided to discharge upward, the liquid phase settles downward, and the solid phase remains in the separation zone, further improving the separation effect;

[0023] A drain pipe 10 is fixedly connected inside the water collecting tank 9. One end of the drain pipe 10 extends to the outside of the tank body 1. A water inlet main pipe 12 is fixedly connected to the outside of the four water inlet branch pipes 18. A water inlet lift pump 13 is arranged on the outside of the water inlet main pipe 12;

[0024] An external circulation pipe 11 is fixedly connected inside the water inlet main pipe 12. The other end of the external circulation pipe 11 extends into the tank body 1. An I-beam 14 is fixedly connected inside the tank body 1. The water collecting tank 9 is fixedly connected to the top of the I-beam 14;

[0025] Butterfly valves 15 are arranged on the outside of the external circulation pipe 11, the water inlet main pipe 12 and the water inlet branch pipes 18. A sampling pipe 16 is fixedly connected inside the tank body 1. A pipe plug 17 is arranged on the outside of the internal circulation pipe 6.

[0026] In summary, when the IC anaerobic reactor for treating PTA production wastewater is in use, the inner part of the tank body 1 is divided into upper and lower layers by the upper and lower three-phase separators 3. The wastewater is introduced into the second reaction zone 21 inside the tank body 1 through the cooperation of the water inlet main pipe 12, the water inlet lift pump 13 and the water inlet branch pipes 18 and mixed with the granular sludge inside, so that most of the organic matters are degraded, generating a large amount of biogas. The biogas is collected by the lower three-phase separator. Due to the large amount of gas production and the relatively fast upward flow rate of the liquid phase, the biogas, wastewater and sludge cannot be well separated, forming a gas-solid-liquid mixed fluid. Also, because the pressure in the three-phase separator is less than the pressure in the reaction zone, the mixed liquid enters the lower three-phase separator under the entrainment of the biogas. Here, most of the biogas separates from the mixed liquid and enters the biogas collection pipe. The density of the mixed fluid becomes larger and it returns to the bottom of the first reaction zone 20 through the return pipe under the action of gravity, mixing with the wastewater and granular sludge in the first reaction zone 20, thus realizing the internal circulation of the fluid in the reactor. The upward flow rate of the liquid phase in the second reaction zone 21 is much smaller than that in the first reaction zone 20. In addition to continuing the biological reaction, this area also acts as a buffer section between the first reaction zone 20 and the sedimentation zone due to the reduction of the upward flow rate, playing an important role in solving the problem of mud running and ensuring the water quality of the effluent after sedimentation. 4 water inlet branch pipes 18 are branched out from the water inlet main pipe 12 and are distributed perpendicular to each other at the bottom of the tank body 1. The water inlet branch pipes 18 are arranged with jet pipes 19 on one side along the water flow direction, and are arranged from sparse to dense from the tank wall to the center. The inner circulation pipe 6 also branches out 4 perpendicular branch pipes, which are arranged alternately with the water inlet branch pipes 18. The branch pipes are also arranged with jet pipes 19 on one side along the water flow direction, and are arranged from dense to sparse from the tank wall to the center to fully stir the mixed liquid at the bottom of the tank, ensuring that the wastewater evenly enters the reaction zone. Each water inlet branch pipe is equipped with a butterfly valve 15, which can adjust the opening degree of the water distribution port according to the changes in the wastewater flow rate and load, realizing flexible water distribution. Through the mutual cooperation of the three-phase separator 3, the conical separator 22, the separation plate 4 and the guide plate 5, gas-liquid separation can be carried out, effectively reducing the phenomenon of biogas entraining the liquid phase. The guide plate 5 guides the biogas to discharge upward, the liquid phase settles downward, and the solid phase remains in the separation zone, further improving the separation effect. The outer circulation pipe 11 can return the mixed liquid in the second reaction zone to the first reaction zone, enhancing the treatment capacity and stability of the reactor, so as to increase the upward flow rate of the first reaction zone.

[0027] The above is only the preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and all should be covered within the protection scope of the present invention.

Claims

1. An IC anaerobic reactor for treating PTA production wastewater, comprising a tank body (1), characterized in that: The tank body (1) is provided with a first reaction zone (20) and a second reaction zone (21) respectively. Two three-phase separators (3) are fixedly connected to the tank body (1). A gas-liquid separation tank (2) is fixedly connected to the top of the tank body (1). Two corresponding second reaction chamber risers (8) are fixedly connected to the gas-liquid separation tank (2). One end of the second reaction chamber riser (8) extends into the tank body (1) and is located above one of the three-phase separators (3). The gas-liquid separation tank (2) is fixedly connected to the two first A reaction chamber lifting pipe (7), wherein the first reaction chamber lifting pipe (7) extends to the interior of the tank body (1) and is located above another three-phase separator (3), wherein a water collecting tank (9) is arranged inside the tank body (1), wherein an internal circulation pipe (6) is fixedly connected to the interior of the gas-liquid separation tank (2), wherein one end of the internal circulation pipe (6) extends to the interior of the tank body (1), wherein four corresponding water inlet branch pipes (18) are fixedly connected to the interior of the tank body (1), and wherein a plurality of jet pipes (19) are fixedly connected to the interior of the water inlet branch pipe (18) and the internal circulation pipe (6).

2. The IC anaerobic reactor for treating PTA production wastewater according to claim 1, characterized in that: A multi-layer conical separator (22) is arranged inside the three-phase separator (3), and the conical separator (22) is composed of a separation plate (4) and a guide plate (5).

3. The IC anaerobic reactor for treating PTA production wastewater according to claim 1, characterized in that: A drainage pipe (10) is fixedly connected to the interior of the water collecting tank (9), and one end of the drainage pipe (10) extends to the outside of the tank body (1).

4. The IC anaerobic reactor for treating PTA production wastewater according to claim 1, characterized in that: The outer sides of the four water inlet branch pipes (18) are fixedly connected to a water inlet main pipe (12), and a water inlet lift pump (13) is arranged on the outer side of the water inlet main pipe (12).

5. The IC anaerobic reactor for treating PTA production wastewater according to claim 4, characterized in that: The interior of the water inlet main pipe (12) is fixedly connected to an external circulation pipe (11), and the other end of the external circulation pipe (11) extends to the interior of the tank body (1).

6. The IC anaerobic reactor for treating PTA production wastewater according to claim 1, characterized in that: An I-beam (14) is fixedly connected to the interior of the tank body (1), and the water collecting tank (9) is fixedly connected to the top of the I-beam (14).

7. The IC anaerobic reactor for treating PTA production wastewater according to claim 5, characterized in that: The outer sides of the external circulation pipe (11), the water inlet main pipe (12) and the water inlet branch pipe (18) are all provided with butterfly valves (15).

8. The IC anaerobic reactor for treating PTA production wastewater according to claim 1, characterized in that: A plurality of sampling tubes (16) are fixedly connected inside the tank body (1), a tube plug (17) is arranged on the outside of the inner circulation tube (6), and the sampling tubes (16) are distributed at four positions of the lower, middle lower, middle upper, and upper part of the tank body.

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