An acid-proof anaerobic reactor for biochemical treatment of coking wastewater

Abstract

The utility model discloses an acidification prevention type anaerobic reactor for coking sewage biochemical treatment, including jar body, and first three -phase separation, second three -phase separator in jar body from top to bottom in proper order, the jar body top surface is equipped with gas -liquid separation tank, is equipped with pH monitor and is used for dosing tank of dosing pH adjustment, the utility model discloses a jar body first three -phase separation, the second three -phase separator of setting can collect marsh gas, forms the internal circulating system, and improves the processing efficiency of reactor, through the feeding of screw rod and piston plate in dosing tank, can more continuous, quantitative dosing, makes the adjustment of pH value more accurate, convenient.

Description

Technical Field

[0001] This utility model relates to the field of coking wastewater treatment technology, specifically to an acid-resistant anaerobic reactor for the biochemical treatment of coking wastewater. Background Technology

[0002] Among anaerobic reactors, the IC anaerobic reactor boasts advantages such as a large height-to-diameter ratio, high upward flow velocity, and high organic loading. Wastewater and sludge can contact effectively within the reactor, thereby enhancing mass transfer efficiency and improving sludge activity. Therefore, the IC anaerobic reactor's capacity to remove organic matter far surpasses that of traditional anaerobic treatment technologies, such as UASB. Furthermore, the IC anaerobic reactor also offers advantages such as small volume, low investment, small footprint, and stable operation, making it a highly efficient anaerobic treatment technology worthy of widespread adoption.

[0003] In terms of working principle, wastewater first enters the mixing zone at the bottom of the IC reactor, where it is thoroughly mixed with the internally circulating sludge-water mixture from the return pipe before entering the granular sludge expanded bed for biochemical degradation of COD (Chemical Oxygen Demand). Most of the influent COD is degraded here, producing a large amount of biogas. The biogas is collected by the lower three-phase separator and rises along the upflow pipe. This internal circulation system not only improves the reactor's treatment efficiency but also effectively ensures the stability of the influent concentration in the first reaction chamber.

[0004] However, during production and use, anaerobic processes primarily aimed at methanogenesis require a pH value between 6.5 and 8.0. When wastewater alkalinity is too low or the operating load is too high, volatile acids accumulate in the reactor, leading to the loss of methanogenic bacteria activity and the proliferation of acid-producing bacteria. If this continues for too long, methanogenic bacteria will completely lose their activity while acetic acid-producing bacteria proliferate, causing "acidification" of the reactor system. Once severe acidification occurs, the reactor is difficult to restore to its original state; therefore, appropriate alkalinity should be added to maintain pH stability, ensuring a suitable environment for methanogenic bacteria and preventing severe "acidification." Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides an acid-resistant anaerobic reactor for the biochemical treatment of coking wastewater.

[0006] The technical solution of this utility model is: an acid-resistant anaerobic reactor for biochemical treatment of coking wastewater, comprising a tank, and a first three-phase separator and a second three-phase separator arranged sequentially from top to bottom within the tank. A gas-liquid separation box is provided on the top surface of the tank, and a pH monitor and a dosing box for adding chemicals to the tank to adjust the pH are provided on the tank. A piston plate is provided inside the dosing box, and a threaded rod is provided on the tank. One end of the threaded rod is threaded through the side of the dosing box and rotatably connected to the piston plate.

[0007] The gas-liquid separator is provided with an exhaust port on its top surface. The gas-liquid separator is connected to the tank body through a first pipe for circulating and returning liquid and a second pipe for exhausting liquid. The first pipe and the second pipe are parallel and both pass through the top surface of the tank body and are fixed to the top surface of the tank body.

[0008] The top of the first pipe is lower than the top of the second pipe, the bottom of the first pipe is located below the second three-phase separator, and the bottom of the second pipe is located between the second three-phase separator and the first three-phase separator; the tank body is provided with a water inlet at the bottom and a water outlet at the top.

[0009] Explanation: The above setup allows wastewater to first enter the bottom of the tank, mix with the internal circulating water from the first pipe, and then undergo biochemical degradation of COD to produce biogas. The biogas is collected by the first three-phase separator and the second three-phase separator, and rises along the second pipe to form an internal circulation system, thus improving the treatment efficiency of anaerobic treatment. The pH monitor can monitor the acidity and alkalinity, and the dosing tank can be used to add chemicals to adjust the pH and prevent acidification.

[0010] Furthermore, the dosing tank specifically comprises: a dosing tank on one side of the piston plate filled with a chemical agent; a motor is provided on the outside of the tank body; a threaded rod is fixed on the output shaft of the motor; one end of the threaded rod passes through the side of the dosing tank and is connected to the other side of the piston plate; the threaded rod is threadedly connected to the side of the dosing tank; a third connecting pipe is provided on the side of the dosing tank filled with the chemical agent; the third connecting pipe is connected to the first connecting pipe.

[0011] Explanation: With the further design of the above-mentioned dosing tank, when the monitored pH value exceeds the range, the motor can be turned on to dosing. The motor drives the threaded rod to rotate, and by squeezing the piston plate, the liquid medicine flows from the third pipe to the first pipe and mixes with the water flow and sewage in the first pipe, thereby increasing the pH value. Through the feeding of the threaded rod and the piston plate, continuous and quantitative dosing can be carried out, making the pH adjustment more precise and convenient.

[0012] Furthermore, the bottom surface of the tank is provided with a stirring element, which includes stirring blades and a shaft.

[0013] Note: The above-mentioned agitator can stir the wastewater entering from the bottom of the tank during pH adjustment, accelerate the dissolution of the reagent, and reduce the accumulation of wastewater and sludge.

[0014] Furthermore, a first bevel gear is provided on the shaft, and a rotating rod is rotatably provided on the tank body. The rotating rod passes through the tank body and is rotatably and sealingly connected to the tank body. A second bevel gear for meshing and transmission with the first bevel gear is sleeved at one end of the rotating rod located inside the tank body. A protective box for preventing mud and sand from entering is sleeved at the meshing point of the first bevel gear and the second bevel gear. The protective box is fixed to the tank body by a short rod. The shaft passes through the bottom surface of the protective box and is rotatably and sealingly connected to the bottom surface of the protective box. The rotating rod passes through the side surface of the protective box and is rotatably and sealingly connected to the side surface of the protective box.

[0015] A first pulley is fitted at one end of a rotating rod located outside the tank, and a second pulley is provided at the end of the threaded rod. The first pulley and the second pulley are connected by a transmission belt.

[0016] Explanation: With the above settings, the agitator can be driven to rotate through the first bevel gear, the second bevel gear, and the transmission belt during the pH adjustment process. This saves on motor usage. The agitator can be turned on while adjusting the pH, which can enhance the adjustment effect and avoid over-mixing caused by prolonged operation of the agitator, which could affect biogas collection and wastewater return.

[0017] Furthermore, a water distribution pipe is provided on the bottom surface of the tank body. The water distribution pipe is annular, and the agent filled in the dosing tank is sodium bicarbonate or sodium carbonate.

[0018] Note: The above-mentioned water distribution pipe configuration ensures more even water flow; the above-mentioned agents adjust the pH while having fewer side effects, preventing the negative impact of alkaline substances on methanogens.

[0019] The beneficial effects of this utility model are:

[0020] This invention utilizes a first three-phase separator and a second three-phase separator within the tank to collect biogas, forming an internal circulation system and improving the reactor's processing efficiency. A pH monitor monitors acidity and alkalinity, while a dosing tank allows for pH adjustment and prevents acidification. When the pH value exceeds the specified range, the dosing tank feeds the material via a threaded rod and piston plate, enabling continuous and quantitative dosing, making pH adjustment more precise and convenient. The first and second bevel gears, along with a transmission belt, drive the agitator, saving on motor usage. Simultaneously, the agitator can be activated while adjusting the pH, preventing incomplete fermentation caused by stirring during biochemical treatment. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the appearance of Embodiment 2 of this utility model;

[0022] Figure 2 This is a schematic diagram of the internal structure of Embodiment 1 of this utility model;

[0023] Figure 3 This is a schematic diagram of the internal structure of Embodiment 2 of this utility model;

[0024] Among them, 1-tank body, 11-inlet, 111-water distribution pipe, 12-outlet, 13-gas-liquid separation box, 14-exhaust port, 15-stirring component, 2-anaerobic mechanism, 21-first connecting pipe, 211-second connecting pipe, 22-first three-phase separation, 23-second three-phase separation, 24-dosing tank, 241-third connecting pipe, 25-piston plate, 26-threaded rod, 27-transmission belt, 28-rotating rod, 281-second bevel gear, 282-first bevel gear, 283-protection box. Detailed Implementation

[0025] The present invention will now be described in more detail with reference to specific embodiments, so as to better demonstrate the advantages of the present invention.

[0026] Example 1: As Figure 1 , Figure 2 As shown, the system includes a tank 1, and a first three-phase separator 22 and a second three-phase separator 23, which are arranged sequentially from top to bottom within the tank 1. A gas-liquid separation box 13 is provided on the top surface of the tank 1. The tank 1 is equipped with a pH monitor and a dosing tank 24 for adding chemicals to the tank 1 to adjust the pH. A piston plate 25 is provided inside the dosing tank 24, and a threaded rod 26 is provided on the tank 1. One end of the threaded rod 26 is threaded through the side of the dosing tank 24 and is rotatably connected to the piston plate 25. The pH monitor can monitor the acidity and alkalinity, and the dosing tank can automatically add chemicals to adjust the pH according to the pH to prevent acidification.

[0027] In one embodiment of this utility model, the threaded rod 26 is driven by a motor located on the outside of the tank body 1, and the output shaft of the motor is connected to the threaded rod 26.

[0028] In one embodiment of this utility model, the top surface of the gas-liquid separator 13 is provided with an exhaust port 14. The gas-liquid separator 13 is connected to the tank body 1 through a first pipe 21 for circulating back liquid and a second pipe 211 for exhausting. The first pipe 21 and the second pipe 211 are parallel and both penetrate the top surface of the tank body 1 and are fixed to the top surface of the tank body 1.

[0029] The top of the first pipe 21 is lower than the top of the second pipe 211. The bottom of the first pipe 21 is located below the second three-phase separator 23. The bottom of the second pipe 211 is located between the second three-phase separator 23 and the first three-phase separator 22. The tank 1 is provided with a water inlet 11 at the bottom and a water outlet 12 at the top.

[0030] The tank 1 is equipped with a pH monitor and a dosing tank 24 for adjusting pH by adding chemicals; the pH monitor is installed on the inner wall of the tank 1 and is a commercially available pH monitor.

[0031] As one implementation of this utility model, such as Figure 2 As shown, the specific structure inside the dosing tank 24 is as follows: the dosing tank 24 on one side of the piston plate 25 is filled with a drug; one end of the threaded rod 26 passes through the side of the dosing tank 24 and is connected to the other side of the piston plate 25; the threaded rod 26 is threadedly connected to the side of the dosing tank 24; a third pipe 241 is provided on one side of the dosing tank 24 filled with a drug, and the third pipe 241 is connected to the first pipe 21.

[0032] The bottom surface of the tank 1 is provided with a stirring element 15, which includes stirring blades and a shaft; the bottom surface of the tank 1 is provided with a water distribution pipe 111, which is annular; the dosing tank 24 is filled with sodium bicarbonate.

[0033] In one implementation of this utility model, the pH level can be monitored by a pH monitor, and the dosing tank 24 can be manually operated to open the motor to add chemicals and adjust the pH.

[0034] The working method of the above-mentioned acid-resistant anaerobic reactor is as follows:

[0035] Wastewater first enters the bottom of tank 1, mixes with the internal circulating water from the first pipe 21, and undergoes biochemical degradation of COD to produce biogas. The biogas is collected by the first three-phase separator 22 and the second three-phase separator 23, and rises along the second pipe 211 to form an internal circulation system, which improves the treatment efficiency of anaerobic treatment. During the pH adjustment process, the rotation of the motor output shaft causes the threaded rod 26 to rotate, pushing the piston plate 25 to move into the tank 1 to realize the dosing process.

[0036] Example 2: This example is basically the same as Example 1, except that;

[0037] like Figure 3As shown, in one implementation of this utility model, a first bevel gear 282 is provided on the shaft, and a rotating rod 28 is rotatably provided on the tank body 1. The rotating rod 28 passes through the tank body 1 and is rotatably and sealingly connected to the tank body 1. One end of the rotating rod 28 located inside the tank body 1 is fitted with a second bevel gear 281 for meshing and transmission with the first bevel gear 282. A protective box 283 for preventing mud and sand from entering is fitted at the meshing point of the first bevel gear 282 and the second bevel gear 281. The protective box 283 is fixed to the tank body 1 by a short rod, and the shaft passes through the bottom surface of the protective box 283 and is connected to the tank body 1. The bottom surface of the protective box 283 is rotatably sealed, and the rotating rod 28 passes through the side of the protective box 283 and is rotatably sealed to the side of the protective box 283; one end of the rotating rod 28 located outside the tank body 1 is fitted with a first pulley, and the end of the threaded rod 26 is fitted with a second pulley. The first pulley and the second pulley are connected by a transmission belt 27; the bevel gear and the transmission belt 27 drive the agitator to rotate, which can save the use of the motor. While adjusting, the agitator can be turned on again, which can enhance the adjustment effect and avoid over-mixing when the agitator is turned on for a long time, which would affect the collection of biogas and the return of sewage.

[0038] Optionally, the bevel gear described above is only one way to achieve the connection of this utility model. It can also be achieved by other connecting parts, such as by a commercially available universal adapter.

[0039] The working method of this embodiment is the same as that of embodiment 1. During the process of adding medicine to adjust the pH, the rotation of the motor output shaft is transmitted through the first pulley, the second pulley and the transmission belt 27, which causes the rotating rod 28 to rotate. The rotating rod 28 rotates with the second bevel gear 281, and the second bevel gear 281 meshes with the first bevel gear 282 to rotate. The first bevel gear 282 drives the shaft, i.e. the stirring component 15, to rotate.

Claims

1. An acid-resistant anaerobic reactor for the biochemical treatment of coking wastewater, characterized in that, The device includes a tank (1), and a first three-phase separator (22) and a second three-phase separator (23) arranged sequentially from top to bottom within the tank (1). The top surface of the tank (1) is provided with a gas-liquid separation box (13). The tank (1) is provided with a pH monitor and a dosing box (24) for adding chemicals to the tank (1) to adjust the pH. The dosing box (24) is provided with a piston plate (25), and the tank (1) is provided with a threaded rod (26). One end of the threaded rod (26) is threaded through the side of the dosing box (24) and rotatably connected to the piston plate (25).

2. The acid-resistant anaerobic reactor for biochemical treatment of coking wastewater as described in claim 1, characterized in that, The bottom surface of the tank (1) is provided with a stirring component (15), which includes stirring blades and a shaft.

3. The acid-resistant anaerobic reactor for biochemical treatment of coking wastewater as described in claim 2, characterized in that, A first bevel gear (282) is provided on the shaft, and a rotating rod (28) is rotatably provided on the tank body (1). The rotating rod (28) passes through the tank body (1) and is rotatably and sealed to the tank body (1). One end of the rotating rod (28) located inside the tank body (1) is fitted with a second bevel gear (281) for meshing and transmission with the first bevel gear (282). A protective box (283) for preventing mud and sand from entering is fitted at the meshing point of the first bevel gear (282) and the second bevel gear (281). The protective box (283) is fixed to the tank body (1) by a short rod. The shaft passes through the bottom surface of the protective box (283) and is rotatably and sealed to the bottom surface of the protective box (283). The rotating rod (28) passes through the side surface of the protective box (283) and is rotatably and sealed to the side surface of the protective box (283).

4. The acid-resistant anaerobic reactor for biochemical treatment of coking wastewater as described in claim 3, characterized in that, A first pulley is fitted at one end of the rotating rod (28) located outside the tank (1), and a second pulley is provided at the end of the threaded rod (26). The first pulley and the second pulley are connected by a transmission belt (27).

5. The acid-resistant anaerobic reactor for biochemical treatment of coking wastewater as described in claim 4, characterized in that, The bottom surface of the tank (1) is provided with a water distribution pipe (111), which is annular, and the agent filled in the dosing tank (24) is sodium bicarbonate or sodium carbonate.

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