Nuclear power plant non-radioactive industrial wastewater sequencing batch treatment device, system and method

Abstract

The invention provides a nuclear power plant non-radioactive industrial wastewater sequencing batch treatment device, system and method.The device comprises a reaction tank, a chemical feeding pipe, a gas inlet / outlet pipe, a gas collecting hood, a nitrogen discharging pipe, a circulating pipe and a circulating pump, the reaction tank comprises a main body part and a collecting part, and a water inlet, a chemical feeding opening and an upper circulating opening are formed in the side wall of the top of the main body part; an air inlet and a water outlet are formed in the side wall of the bottom of the main body part; a lower circulating opening is formed in the side wall of the collecting part, and a phosphorus discharging opening is formed in the bottom of the collecting part; the medicine adding pipe is communicated with the medicine adding opening, and a medicine discharging hole is formed in the medicine adding pipe; the air inlet / outlet pipe is simultaneously communicated with the air inlet and the water outlet, and is provided with a through hole; one end of the circulating pipe is communicated with the lower circulating port, the other end of the circulating pipe is communicated with the upper circulating port, and the circulating pump is arranged on the circulating pipe; the nitrogen discharge pipe is communicated with the top of the gas-collecting hood, and an ammonia mist absorber is arranged on the nitrogen discharge pipe.

Description

Technical Field

[0001] The present invention relates to the technical field of nuclear power plant wastewater treatment, and in particular to a sequencing batch treatment device, system and method for non-radioactive industrial wastewater from a nuclear power plant. Background Art

[0002] Nuclear power plants will discharge non-radioactive industrial wastewater (referred to as non-released wastewater) during normal operation, commissioning, and maintenance. The main characteristics of this non-released wastewater are high ammonia nitrogen and phosphate content, and the absence of degradable organic matter. It is difficult to treat it through biochemical methods to meet emission standards.

[0003] At present, chemical dosing is generally used to remove ammonia nitrogen and phosphate from non-released wastewater. The treatment process used is to adjust the pH, mix, react, and precipitate the non-released wastewater in sequence. Each process requires the configuration of pH adjustment tanks, mixing tanks, reaction tanks, sedimentation tanks and other equipment. These equipment occupy a large area, have high investment costs, are complex to control and operate, and require high professional operation and maintenance. As a result, the initial construction investment of the wastewater treatment system is large and the subsequent operation and maintenance technology is difficult. Summary of the Invention

[0004] The purpose of the present invention is to provide a batch treatment device for non-radioactive industrial wastewater in nuclear power plants, which can reduce the number of equipment, reduce the equipment footprint, lower investment costs, and is simple to operate, easy to use and maintain.

[0005] The present invention provides a sequencing batch treatment device for non-radioactive industrial wastewater from a nuclear power plant, comprising a reaction tank, a dosing pipe, an air inlet / water outlet pipe, a gas collecting hood, a nitrogen exhaust pipe, a circulation pipe, and a circulation pump. The reaction tank comprises a main body and a collecting portion, the collecting portion being fixedly connected to the bottom of the main body, and the cross-sectional area of the collecting portion gradually decreasing from top to bottom; a water inlet, a dosing port, and an upper circulation port are provided on the top side wall of the main body, an air inlet and a water outlet are provided on the bottom side wall of the main body; a lower circulation port is provided on the side wall of the collecting portion, and a phosphorus exhaust port is provided at the bottom of the collecting portion;

[0006] The dosing pipe is arranged at the top of the main body, the dosing pipe is connected to the dosing port, and the dosing pipe is provided with a discharge hole; the air inlet / water outlet pipe is arranged at the bottom of the main body, the air inlet / water outlet pipe is connected to the air inlet and the water outlet at the same time, and the air inlet / water outlet pipe is provided with a through hole; one end of the circulation pipe is connected to the lower circulation port, and the other end of the circulation pipe is connected to the upper circulation port, and the circulation pump is arranged on the circulation pipe;

[0007] The gas collecting hood is fixedly connected to the top of the main body, the cross-sectional area of the gas collecting hood gradually decreases from bottom to top, the nitrogen exhaust pipe is connected to the top of the gas collecting hood, and an ammonia mist absorber is provided on the nitrogen exhaust pipe.

[0008] In one achievable manner, the main body is a cylindrical structure, the collecting portion is an inverted truncated cone structure, and the gas collecting hood is a conical structure;

[0009] Alternatively, the main body is a rectangular cylindrical structure, the collecting portion is an inverted quadrangular pyramid structure, and the gas collecting hood is a quadrangular pyramid structure.

[0010] In one feasible embodiment, an air inlet branch pipe and a water outlet branch pipe are provided on the side wall of the main body, and the air inlet branch pipe and the water outlet branch pipe are both located outside the main body, the air inlet is provided at one end of the air inlet branch pipe, and the other end of the air inlet branch pipe is connected to the air inlet / water outlet pipe; the water outlet is provided at one end of the water outlet branch pipe, and the other end of the water outlet branch pipe is connected to the air inlet / water outlet pipe; a first valve is provided on the water outlet branch pipe, and a second valve is provided on the air inlet branch pipe.

[0011] In one feasible manner, it further includes a ventilation pipe, one end of which is connected to the gas collecting hood, and the other end of which is connected to the dosing pipe; a third valve is provided on the ventilation pipe.

[0012] In one feasible manner, a drug feed pipe is provided on the side wall of the main body, the drug feed pipe is located outside the main body, the drug adding port is provided at one end of the drug feed pipe, and the other end of the drug feed pipe is connected to the drug adding pipe; one end of the ventilation pipe is connected to the drug feed pipe.

[0013] In one possible implementation, the dosing pipe includes a first main pipe and a plurality of first branch pipes, the plurality of first branch pipes are all connected to the first main pipe, and the plurality of first branch pipes are arranged at intervals along the length direction of the first main pipe, each of the first branch pipes is provided with a plurality of the drug discharge holes at intervals along the length direction thereof, and one end of the first main pipe is connected to the dosing port;

[0014] The air inlet / water outlet pipe includes a second main pipe and multiple second branch pipes. The multiple second branch pipes are all connected to the second main pipe, and the multiple second branch pipes are arranged at intervals along the length direction of the second main pipe. Each second branch pipe is provided with multiple through holes at intervals along its length direction. One end of the second main pipe is connected to the air inlet and the water outlet at the same time.

[0015] In one practicable manner, a transparent phosphorus-exhausting sight glass is provided on the side wall of the collecting portion, and the phosphorus-exhausting sight glass extends from the upper end to the lower end of the collecting portion.

[0016] In one feasible embodiment, a first sampling port, a second sampling port and a third sampling port are provided on the side wall of the main body, and the first sampling port, the second sampling port and the third sampling port are spaced apart from top to bottom, the height of the first sampling port is the same as the height of the upper circulation port, the height of the third sampling port is the same as the height of the air inlet / water outlet pipe, and the second sampling port is located in the middle between the first sampling port and the third sampling port.

[0017] The present invention also provides a batch treatment system for non-radioactive industrial wastewater from a nuclear power plant, comprising the above-mentioned batch treatment device for non-radioactive industrial wastewater from a nuclear power plant, an acid and alkali dosing device, an oxidant dosing device, a reducing agent dosing device, a dephosphorization agent dosing device, a water inlet pipeline, and an air inlet pipeline, wherein the acid and alkali dosing device, the oxidant dosing device, the reducing agent dosing device, and the dephosphorization agent dosing device are all connected to the dosing port on the reaction tank, the water inlet pipeline is connected to the water inlet on the reaction tank, and the air inlet pipeline is connected to the air inlet on the reaction tank.

[0018] The present invention also provides a method for treating non-radioactive industrial wastewater from a nuclear power plant in a batch process. Based on the above-mentioned apparatus for treating non-radioactive industrial wastewater from a nuclear power plant, the method comprises the following steps:

[0019] S1: discharge the non-discharged wastewater into the reaction tank through the water inlet on the reaction tank;

[0020] S2: Control the circulation pump to start, so that the non-discharged wastewater circulates through the circulation pipe; add acid or alkali solution into the reaction tank through the dosing port on the reaction tank and through the dosing pipe, and then introduce compressed air into the reaction tank through the air inlet on the reaction tank and through the air inlet / water outlet pipe to aerate the non-discharged wastewater, so that the non-discharged wastewater and the acid or alkali solution undergo a neutralization reaction; control the amount of acid or alkali solution added until the pH value of the non-discharged wastewater reaches a preset range;

[0021] S3: Controlling the circulation pump to start so that the non-released wastewater circulates through the circulation pipe; adding an oxidant into the reaction tank through the dosing port on the reaction tank and through the dosing pipe, and then introducing compressed air into the reaction tank through the air inlet on the reaction tank and through the air inlet / water outlet pipe to aerate the non-released wastewater; ammonia nitrogen in the non-released wastewater undergoes an oxidation-reduction reaction with the oxidant to generate nitrogen, which is discharged out of the reaction tank through the gas collecting hood, the ammonia mist absorber and the nitrogen exhaust pipe; controlling the dosage of the oxidant until the ammonia nitrogen content of the non-released wastewater reaches a preset range;

[0022] S4: Controlling the circulation pump to start so that the non-released wastewater circulates through the circulation pipe; adding a reducing agent into the reaction tank through the dosing port on the reaction tank and through the dosing pipe, and then introducing compressed air into the reaction tank through the air inlet on the reaction tank and through the air inlet / water outlet pipe to aerate the non-released wastewater, so that the remaining oxidant in the non-released wastewater undergoes an oxidation-reduction reaction with the reducing agent and is removed; controlling the amount of reducing agent added until the oxidant content in the non-released wastewater reaches a preset range;

[0023] S5: Controlling the circulation pump to start so that the non-discharged wastewater circulates through the circulation pipe; adding acid or alkali solution into the reaction tank through the dosing port on the reaction tank and the dosing pipe, and then introducing compressed air into the reaction tank through the air inlet on the reaction tank and the air inlet / water outlet pipe to aerate the non-discharged wastewater, so that the non-discharged wastewater and the acid or alkali solution undergo a neutralization reaction; controlling the amount of acid or alkali solution added until the pH value of the non-discharged wastewater reaches a preset range;

[0024] S6: Controlling the circulation pump to start so that the non-discharged wastewater circulates through the circulation pipe; adding a dephosphorization agent into the reaction tank through the dosing port on the reaction tank and the dosing pipe, and then introducing compressed air into the reaction tank through the air inlet on the reaction tank and the air inlet / water outlet pipe to aerate the non-discharged wastewater, so that the phosphate in the non-discharged wastewater reacts with the dephosphorization agent to generate insoluble matter and form a phosphate-containing precipitate; controlling the dosage of the dephosphorization agent until the total phosphorus content of the non-discharged wastewater reaches a preset range;

[0025] S7: allowing the non-wastewater in the reaction tank to stand until the suspended solid content of the supernatant in the non-wastewater reaches a preset range;

[0026] S8: Discharge the supernatant in the non-wastewater to the outside of the reaction tank through the air inlet / water outlet pipe and the water outlet;

[0027] S9: The phosphate precipitate in the non-discharged wastewater is discharged out of the reaction tank through the phosphorus discharge port.

[0028] The present invention provides a sequencing batch treatment device for non-radioactive industrial wastewater from a nuclear power plant. The device is provided with a reaction tank and is provided with a water inlet, a dosing port, an upper circulation port, an air inlet, a water outlet, a lower circulation port, a phosphorus discharge port, an air inlet / water outlet pipe, a gas collecting hood, a nitrogen discharge pipe, a circulation pipe, and a circulation pump on / in the reaction tank. The device realizes the functions of wastewater treatment, wastewater aeration and circulation mixing, gas discharge, supernatant discharge, and phosphate-containing precipitate discharge in the reaction tank. Through sequencing batch operation, harmless treatment of non-radioactive industrial wastewater from nuclear power plants is achieved in the same device. Compared with a process-based process, the device reduces the number of equipment, reduces the equipment footprint, reduces the investment cost, and facilitates equipment operation and maintenance. At the same time, the sequencing batch operation mode is adopted, and each operation step is basically the same. Only simple dosing operations need to be repeated, which reduces technical difficulty and facilitates operation and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 Schematic diagram of the structure of a sequencing batch treatment device for non-radioactive industrial wastewater from a nuclear power plant according to an embodiment of the present invention.

[0030] Figure 2 1 is a top view of the reaction tank in an embodiment of the present invention.

[0031] Figure 3 This is a bottom view of the dosing tube in an embodiment of the present invention.

[0032] Figure 4 This is a bottom view of the air inlet / water outlet pipe in an embodiment of the present invention.

[0033] Figure 5 Schematic diagram of the structure of a sequencing batch treatment system for non-radioactive industrial wastewater from a nuclear power plant according to an embodiment of the present invention. DETAILED DESCRIPTION

[0034] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0035] The terms "first," "second," "third," "fourth," and the like (if any) in the description and claims of the present invention are used to distinguish similar objects and are not necessarily used to describe a particular sequential order or sequence.

[0036] The directional terms "up," "down," "left," "right," "front," "back," "top," and "bottom" (if any) used in the specification and claims of the present invention are defined by the positions of the structures in the drawings and the positions of the structures relative to each other, and are intended only for clarity and convenience in expressing the technical solution. It should be understood that the use of directional terms should not limit the scope of protection claimed in the present invention.

[0037] like Figures 1 to 5 As shown, an embodiment of the present invention provides a batch treatment apparatus for non-radioactive industrial wastewater from a nuclear power plant, which is used to treat non-radioactive wastewater (i.e., non-radioactive industrial wastewater from a nuclear power plant). The batch treatment apparatus includes a reaction tank 1, a dosing pipe 2, an air inlet / outlet pipe 3, a gas collection hood 4, a nitrogen exhaust pipe 5, a circulation pipe 6, and a circulation pump 61.

[0038] The reactor 1 comprises a main body 1A and a collection portion 1B. The collection portion 1B is located below the main body 1A and fixedly connected to the bottom of the main body 1A. The inner cavity of the collection portion 1B communicates with the inner cavity of the main body 1A. The main body 1A is a hollow cylindrical structure, and the outer dimensions of each part of the main body 1A are uniform. The cross-sectional area of the collection portion 1B gradually decreases from top to bottom, that is, the outer dimensions of the collection portion 1B gradually decrease from top to bottom. This facilitates the collection portion 1B to collect sediment and allows the sediment in the collection portion 1B to smoothly sink to the bottom of the collection portion 1B and be discharged through the phosphorus discharge port 107. A water inlet 101, a dosing port 102, and an upper circulation port 103 are provided on the top side wall of the main body 1A, an air inlet 104 and a water outlet 105 are provided on the bottom side wall of the main body 1A, a lower circulation port 106 is provided on the side wall of the collecting part 1B, and a phosphorus discharge port 107 is provided at the bottom of the collecting part 1B. The water inlet 101, the dosing port 102, the upper circulation port 103, the air inlet 104, the water outlet 105, the lower circulation port 106, and the phosphorus discharge port 107 are all arranged outside the reaction tank 1.

[0039] The dosing pipe 2 is located at the top of the main body 1A and communicates with the dosing port 102. It is equipped with a discharge hole 20 for discharging the liquid medicine. The air inlet / outlet pipe 3 is located at the bottom of the main body 1A and communicates with both the air inlet 104 and the water outlet 105. It is equipped with a through hole 30 for both exhaust and liquid intake. The air inlet / outlet pipe 3 serves a dual purpose, serving both aeration and liquid drainage. One end of the circulation pipe 6 is connected to the lower circulation port 106, and the other end of the circulation pipe 6 is connected to the upper circulation port 103. The circulation pump 61 is arranged on the circulation pipe 6. The circulation pump 61 is used to transport the non-discharged wastewater at the bottom of the reaction tank 1 to the top of the reaction tank 1 through the lower circulation port 106, the circulation pipe 6 and the upper circulation port 103 in sequence, thereby realizing the circulation of the non-discharged wastewater and facilitating the uniform mixing and reaction of the liquid medicine and the non-discharged wastewater.

[0040] The gas collecting hood 4 is located above the main body 1A and is fixedly connected to the top of the main body 1A. The inner cavity of the gas collecting hood 4 is connected to the inner cavity of the main body 1A. The cross-sectional area of the gas collecting hood 4 gradually decreases from bottom to top, that is, the outer size of the gas collecting hood 4 gradually decreases from bottom to top. One end of the nitrogen exhaust pipe 5 is connected to the top of the gas collecting hood 4, and the other end of the nitrogen exhaust pipe 5 is provided with a nitrogen exhaust port 50; an ammonia mist absorber 51 is provided on the nitrogen exhaust pipe 5. The gas collecting hood 4 is used to collect nitrogen formed after the treatment of non-discharged wastewater, and discharge the nitrogen through the nitrogen exhaust port 50 on the nitrogen exhaust pipe 5; the ammonia mist absorber 51 is used to absorb a small amount of ammonia mixed in the nitrogen (on the one hand, during the dosing process, the liquid medicine reacts with the wastewater to generate nitrogen, and some ammonia will be mixed in the nitrogen; on the other hand, during the aeration process, the compressed air will also take away some of the ammonia in the wastewater, so it is necessary to set up an ammonia mist absorber 51 to absorb the small amount of ammonia in the exhaust gas).

[0041] Among them, the water inlet 101 is used to connect the water inlet pipeline 85 to discharge the non-discharged wastewater into the reaction tank 1 through the water inlet 101; the dosing port 102 is used to connect the acid and alkali dosing device 81, the oxidant dosing device 82, the reductant dosing device 83 and the dephosphorization agent dosing device 84 to add acid or alkali solution, oxidant, reductant and dephosphorization agent into the reaction tank 1 through the dosing port 102 and the dosing pipe 2; the air inlet 104 is used to connect the air inlet pipeline 86, and the air inlet pipeline 86 is used to connect the air source (such as an air compressor) to pass compressed air into the reaction tank 1 through the air inlet 104 and the air inlet / water outlet pipe 3 to achieve aeration and mixing of the non-discharged wastewater, thereby facilitating uniform mixing and reaction of the liquid medicine and the non-discharged wastewater; the water outlet 105 is used to discharge the supernatant formed after the non-discharged wastewater is treated; the phosphorus discharge port 107 is used to discharge the phosphate-containing precipitate formed after the non-discharged wastewater is treated.

[0042] A sequencing batch treatment device for non-radioactive industrial wastewater from a nuclear power plant provided in an embodiment of the present invention comprises a reactor 1, and is provided with a water inlet 101, a dosing port 102, an upper circulation port 103, an air inlet 104, a water outlet 105, a lower circulation port 106, a phosphorus discharge port 107, an air inlet / water outlet pipe 3, a gas collecting hood 4, a nitrogen discharge pipe 5, a circulation pipe 6, and a circulation pump 61 on / in the reactor 1. The device achieves functions such as wastewater treatment, wastewater aeration and circulation mixing, gas discharge, supernatant discharge, and phosphate-containing precipitate discharge in the reactor 1. Through sequencing batch operation, harmless treatment of non-radioactive industrial wastewater from nuclear power plants is achieved within the same device. Compared with a process-based process, the device reduces the number of equipment, the equipment footprint, and the investment cost, and facilitates equipment operation and maintenance. Furthermore, the sequencing batch operation mode is adopted, and each operation step is substantially identical, requiring only repeated simple dosing operations, thereby reducing technical difficulty and facilitating operation.

[0043] In one embodiment, the main body 1A is open at both ends. The gas collection hood 4 is disposed at and seals the upper opening of the main body 1A. The collection portion 1B is disposed at and seals the lower opening of the main body 1A. The main body 1A, the collection portion 1B, and the gas collection hood 4 can be made of a corrosion-resistant metal material, such as stainless steel. The collection portion 1B and the gas collection hood 4 are connected to the main body 1A by welding.

[0044] The shapes of the collecting portion 1B and the gas collecting hood 4 are determined according to the shape of the main body 1A. As an embodiment, the main body 1A is a cylindrical structure, the collecting portion 1B is an inverted truncated cone structure, and the gas collecting hood 4 is a conical structure. The phosphorus discharge port 107 is connected to the bottom center position of the collecting portion 1B, and the nitrogen discharge pipe 5 is connected to the top center position of the gas collecting hood 4. As another embodiment, the main body 1A is a rectangular parallelepiped (including a cube) cylindrical structure, the collecting portion 1B is an inverted quadrangular cone structure, and the gas collecting hood 4 is a quadrangular pyramid structure. Of course, in other embodiments, the main body 1A, the collecting portion 1B and the gas collecting hood 4 can also be other shape structures.

[0045] like Figure 1 As shown, as an embodiment, an air inlet branch pipe 11 and a water outlet branch pipe 12 are provided on the side wall of the main body 1A. Both the air inlet branch pipe 11 and the water outlet branch pipe 12 are located outside the main body 1A. An air inlet 104 is provided at one end of the air inlet branch pipe 11, the other end of which is connected to the air inlet / water outlet pipe 3. A water outlet 105 is provided at one end of the water outlet branch pipe 12, the other end of which is connected to the air inlet / water outlet pipe 3. A first valve 121 is provided on the water outlet branch pipe 12, and a second valve 111 is provided on the air inlet branch pipe 11.

[0046] Specifically, in this embodiment, the air inlet branch pipe 11 and the water outlet branch pipe 12 merge and communicate with the air inlet / water outlet pipe 3 through a merging pipe 13. The merging pipe 13 and the air inlet / water outlet pipe 3 can be an integral structure or a separate structure. When air is being taken in, the second valve 111 is open and the first valve 121 is closed; when water is being discharged, the first valve 121 is open and the second valve 111 is closed.

[0047] like Figure 1 As shown, as an embodiment, the nuclear power plant non-radioactive industrial wastewater sequencing batch treatment device also includes a ventilation pipe 7, one end of the ventilation pipe 7 is connected to the side of the gas collecting hood 4, and the other end of the ventilation pipe 7 is connected to the dosing pipe 2; a third valve 71 is provided on the ventilation pipe 7.

[0048] Specifically, the purpose of providing the ventilation pipe 7 is that: when adding medicine, the liquid medicine in the dosing pipe 2 may not be completely discharged (that is, a part of the liquid medicine will remain in the dosing pipe 2). By providing the ventilation pipe 7, during aeration, the third valve 71 is opened, and the gas collected in the gas collecting hood 4 enters the dosing pipe 2 through the ventilation pipe 7, thereby squeezing out the residual liquid medicine in the dosing pipe 2 and draining the liquid medicine in the dosing pipe 2. In this way, on the one hand, it can be beneficial to the precise control of the amount of liquid medicine added and improve the utilization rate of the liquid medicine. On the other hand, since the dosing tube 2 needs to transport different liquid medicines respectively, by draining the liquid medicine in the dosing tube 2, it is possible to avoid the previous liquid medicine being squeezed out and added to the non-discharged wastewater when the next liquid medicine is added, resulting in excessive addition of liquid medicine to the non-discharged wastewater (for example, when adding acid, if a large amount of acid remains in the dosing tube 2 after the acid is added, when the oxidant is subsequently added, the oxidant will squeeze out the remaining acid in the dosing tube 2, causing excessive addition of acid to the non-discharged wastewater, causing its pH to exceed the range). During dosing, the third valve 71 is closed.

[0049] like Figure 1 As shown, as an embodiment, a drug inlet pipe 14 is provided on the side wall of the main body 1A. The drug inlet pipe 14 is located outside the main body 1A. The drug dosing port 102 is provided at one end of the drug inlet pipe 14. The other end of the drug inlet pipe 14 is connected to the drug dosing pipe 2. One end of the ventilation pipe 7 is connected to the drug inlet pipe 14, that is, the ventilation pipe 7 is connected to the drug dosing pipe 2 through the drug inlet pipe 14. The drug inlet pipe 14 and the drug dosing pipe 2 can be an integral structure or a separate structure.

[0050] like Figure 1 As shown, as an embodiment, a phosphorus discharge pipe 15 is provided at the bottom of the collection portion 1B. The phosphorus discharge pipe 15 is located outside the collection portion 1B, and one end of the phosphorus discharge pipe 15 is connected to the center of the bottom of the collection portion 1B (specifically, it can be connected by welding). The phosphorus discharge port 107 is provided at the other end of the phosphorus discharge pipe 15. The circulation pipe 6 is provided with a fourth valve 62, and the phosphorus discharge pipe 15 is provided with a fifth valve 151.

[0051] like Figure 1 and Figure 3As shown, as an embodiment, the dosing pipe 2 includes a first main pipe 21 and a plurality of first branch pipes 22. The plurality of first branch pipes 22 are connected to the first main pipe 21. The plurality of first branch pipes 22 are respectively arranged on opposite sides of the first main pipe 21 and are spaced apart along the length of the first main pipe 21. Each first branch pipe 22 is provided with a plurality of discharge holes 20 spaced apart along its length. The discharge holes 20 are provided at the bottom of the first branch pipe 22. One end of the first main pipe 21 is connected to the dosing port 102 (specifically, the drug inlet pipe 14). Specifically, the end of each first branch pipe 22 (i.e., the end away from the first main pipe 21) is a closed structure. The end of the first main pipe 21 (i.e., the end away from the dosing port 102) is a closed structure. In this way, the liquid medicine can only be sprayed out from the discharge holes 20 on each first branch pipe 22. The discharge holes 20 are circular holes with a diameter of 5-8 mm. This main-branch-pipe type dosing pipe 2 can spray the liquid medicine evenly, thereby improving the mixing uniformity of the liquid medicine and the non-wastewater.

[0052] like Figure 1 and Figure 4 As shown, as an embodiment, the air inlet / water outlet pipe 3 includes a second main pipe 31 and multiple second branch pipes 32. The multiple second branch pipes 32 are all connected to the second main pipe 31 and are respectively arranged on opposite sides of the second main pipe 31. The multiple second branch pipes 32 are spaced apart along the length of the second main pipe 31. Each second branch pipe 32 is provided with multiple through holes 30 spaced apart along its length. The through holes 30 are arranged on both sides of the bottom of the second branch pipe 32 at a 45° angle downward. One end of the second main pipe 31 is connected to both the air inlet 104 and the water outlet 105 (specifically, it is connected to the air inlet branch pipe 11 and the water outlet branch pipe 12 respectively via the merging pipe 13). The end of each second branch pipe 32 (i.e., the end away from the second main pipe 31) is a closed structure. The end of the second main pipe 31 (i.e., the end away from the air inlet 104 and the water outlet 105) is also a closed structure. The through holes 30 are circular holes with a diameter of 15-25 mm. This main-branch type air inlet / water outlet pipe 3 can not only discharge the compressed air evenly and improve the uniformity of aeration, but also increase the speed of supernatant entering the air inlet / water outlet pipe 3 during drainage, thereby increasing the drainage speed.

[0053] like Figure 1 As shown, as an embodiment, the nitrogen exhaust pipe 5 is a bent pipe, and the end of the nitrogen exhaust pipe 5 (i.e., the end away from the gas collecting hood 4) is bent downward, so that the nitrogen exhaust port 50 is downward, thereby preventing external rainwater and the like from entering the reaction tank 1 through the nitrogen exhaust port 50.

[0054] like Figure 1As shown, as an embodiment, a water inlet pipe 16 is provided on the side wall of the main body 1A, one end of the water inlet pipe 16 is located outside the main body 1A and is provided with a water inlet 101, and the other end of the water inlet pipe 16 extends into the main body 1A.

[0055] like Figure 1 As shown, as an embodiment, a transparent phosphorus drainage sight glass 17 is provided on the side wall of the collecting portion 1B, extending from the upper end to the lower end of the collecting portion 1B. The phosphorus drainage sight glass 17 is used to allow the operator to observe the precipitation effect of the phosphate-containing precipitate to facilitate subsequent operations. Specifically, the phosphorus drainage sight glass 17 can be made of transparent organic glass. A long strip of notch can be provided in the collecting portion 1B, and the phosphorus drainage sight glass 17 can be installed in the notch and sealed (the phosphorus drainage sight glass 17 and the collecting portion 1B can be connected by bolts), thereby achieving the effect of partially transparent collecting portion 1B.

[0056] like Figure 1 As shown, as an embodiment, a liquid level gauge 18 is provided on the side wall of the main body 1A. Specifically, a liquid level gauge interface 108 is provided on the bottom side wall of the main body 1A, and the liquid level gauge 18 is installed at the liquid level gauge interface 108. The liquid level gauge 18 is used to detect the liquid level in the reaction tank 1. The liquid level gauge 18 has a high liquid level monitoring point and a low liquid level monitoring point. The high liquid level monitoring point is located at the top of the main body 1A, and the low liquid level monitoring point is located at the bottom of the main body 1A.

[0057] like Figure 1 As shown, as an embodiment, in the height direction of the reaction tank 1, the water inlet 101, the dosing port 102 and the dosing pipe 2 are at the same height, and are lower than the height of the gas collecting hood 4 and higher than the height of the high liquid level monitoring point of the liquid level gauge 18; the height of the upper circulation port 103 is slightly lower than the height of the high liquid level monitoring point of the liquid level gauge 18; the liquid level gauge 18 is located at the bottom of the main body 1A, slightly higher than the lower edge of the main body 1A; the air inlet 104, the water outlet 105 and the air / water inlet / outlet pipe 3 are at the same height, and are all located at the bottom of the main body 1A, slightly higher than the liquid level gauge 18.

[0058] like Figure 1As shown, as an embodiment, a first sampling port H1, a second sampling port H2, and a third sampling port H3 are provided on the side wall of the main body 1A for sampling and analyzing the non-wastewater in the reaction tank 1; the first sampling port H1, the second sampling port H2, and the third sampling port H3 are spaced apart from each other from top to bottom, the height of the first sampling port H1 is the same as the height of the upper circulation port 103, the height of the third sampling port H3 is the same as the height of the air inlet / water outlet pipe 3, and the second sampling port H2 is located in the middle between the first sampling port H1 and the third sampling port H3 (that is, the height difference between the second sampling port H2 and the first sampling port H1 is equal to the height difference between the second sampling port H2 and the third sampling port H3). Such a setting can make the results of the sampling and analysis more representative, thereby improving the wastewater treatment effect.

[0059] like Figure 1 and Figure 5 As shown, this embodiment also provides a batch treatment system for non-radioactive industrial wastewater from a nuclear power plant, comprising the above-mentioned batch treatment device for non-radioactive industrial wastewater from a nuclear power plant, an acid and alkali dosing device 81, an oxidant dosing device 82, a reducing agent dosing device 83, a dephosphorization agent dosing device 84, a water inlet pipeline 85, and an air inlet pipeline 86. The acid and alkali dosing device 81, the oxidant dosing device 82, the reducing agent dosing device 83, and the dephosphorization agent dosing device 84 are all connected to the dosing port 102 on the reaction tank 1, the water inlet pipeline 85 is connected to the water inlet 101 on the reaction tank 1, and the air inlet pipeline 86 is connected to the air inlet 104 on the reaction tank 1.

[0060] Among them, the acid and alkali dosing device 81 is used to add acid or alkali solution into the reaction tank 1 through the dosing port 102 and the dosing tube 2, the oxidant dosing device 82 is used to add oxidant into the reaction tank 1 through the dosing port 102 and the dosing tube 2, the reducing agent dosing device 83 is used to add reducing agent into the reaction tank 1 through the dosing port 102 and the dosing tube 2, the dephosphorization agent dosing device 84 is used to add dephosphorization agent into the reaction tank 1 through the dosing port 102 and the dosing tube 2, the water inlet pipeline 85 is used to discharge non-wastewater into the reaction tank 1 through the water inlet 101, and the air inlet pipeline 86 is used to introduce compressed air into the reaction tank 1 through the air inlet 104 and the air inlet / water outlet pipe 3.

[0061] Specifically, the acid-base dosing device 81 includes an acid tank (not numbered in the figure), a first dosing pump (not numbered in the figure), an alkali tank (not numbered in the figure), and a second dosing pump (not numbered in the figure). The acid tank is connected to the dosing port 102 via the first dosing pump. The acid tank is used to store acid and add acid to the reaction tank 1 via the first dosing pump. The alkali tank is connected to the dosing port 102 via the second dosing pump. The alkali tank is used to store alkali and add alkali to the reaction tank 1 via the second dosing pump. The oxidant dosing device 82 includes an oxidant tank (not numbered in the figure) and a third dosing pump (not numbered in the figure). The oxidant tank is connected to the dosing port 102 via the third dosing pump. The oxidant tank is used to store oxidant and add oxidant to the reaction tank 1 via the third dosing pump. The reducing agent dosing device 83 includes a reducing agent tank (not numbered) and a fourth dosing pump (not numbered). The reducing agent tank is connected to the dosing port 102 via the fourth dosing pump. The reducing agent tank is used to store reducing agent and add reducing agent to the reaction tank 1 via the fourth dosing pump. The dephosphorization agent dosing device 84 includes a dephosphorization agent tank (not numbered) and a fifth dosing pump (not numbered). The dephosphorization agent tank is connected to the dosing port 102 via the fifth dosing pump. The dephosphorization agent tank is used to store dephosphorization agent and add dephosphorization agent to the reaction tank 1 via the fifth dosing pump.

[0062] As an embodiment, the sequencing batch treatment system for non-radioactive industrial wastewater of a nuclear power plant further includes a drainage pipeline (not shown) and a phosphorus discharge pipeline (not shown). The drainage pipeline is connected to the water outlet 105 on the reaction tank 1, and the phosphorus discharge pipeline is connected to the phosphorus discharge port 107 on the reaction tank 1; the drainage pipeline is used to discharge the supernatant, and the phosphorus discharge pipeline is used to discharge the phosphate-containing precipitate.

[0063] As an embodiment, the sequencing batch treatment system for non-radioactive industrial wastewater in a nuclear power plant also includes a control unit (not shown in the figure), which can be a PLC controller. The control unit is respectively connected to the circulation pump 61, the first valve 121, the second valve 111, the third valve 71, the fourth valve 62, the fifth valve 151, the liquid level meter 18, the first dosing pump, the second dosing pump, the third dosing pump, the fourth dosing pump and the fifth dosing pump by electrical signals to control the opening and closing of each component.

[0064] This embodiment further provides a method for treating non-radioactive industrial wastewater from a nuclear power plant in a batch process. Based on the aforementioned non-radioactive industrial wastewater treatment device or the aforementioned non-radioactive industrial wastewater treatment system, the method for treating non-radioactive industrial wastewater from a nuclear power plant in a batch process adopts a batch process and includes the following steps:

[0065] S1: Discharge non-radioactive wastewater (i.e., non-radioactive industrial wastewater from a nuclear power plant) into the reaction tank 1 through the water inlet 101 on the reaction tank 1;

[0066] S2: Control the circulation pump 61 to start so that the non-discharged wastewater circulates through the circulation pipe 6; add acid or alkali solution into the reaction tank 1 through the dosing port 102 on the reaction tank 1 and through the dosing pipe 2 (specifically, whether to add acid or alkali solution depends on the actual pH value of the non-discharged wastewater, wherein the acid solution can be a hydrochloric acid solution and the alkali solution can be a sodium hydroxide solution). After the dosing is completed, open the third valve 71, and then pass compressed air into the reaction tank 1 through the air inlet 104 on the reaction tank 1 and through the air inlet / water outlet pipe 3 to aerate the non-discharged wastewater, so that the non-discharged wastewater and the acid or alkali solution undergo a neutralization reaction; control the amount of acid or alkali solution added until the pH value of the non-discharged wastewater reaches a preset range (for example, the pH value reaches 6.0 to 9.0);

[0067] S3: Control the circulation pump 61 to start, so that the non-released wastewater circulates through the circulation pipe 6; add an oxidant (e.g., sodium hypochlorite solution) into the reaction tank 1 through the dosing port 102 on the reaction tank 1 and through the dosing pipe 2. After the dosing is completed, open the third valve 71, and then introduce compressed air into the reaction tank 1 through the air inlet 104 on the reaction tank 1 and through the air inlet / water outlet pipe 3 to aerate the non-released wastewater; ammonia nitrogen in the non-released wastewater undergoes a redox reaction with the oxidant to generate nitrogen, which is discharged to the outside of the reaction tank 1 through the gas collecting hood 4, the ammonia mist absorber 51 and the nitrogen exhaust pipe 5; control the amount of oxidant added until the ammonia nitrogen content of the non-released wastewater reaches a preset range (e.g., the ammonia nitrogen content is less than 5 mg / L);

[0068] S4: Controlling the circulation pump 61 to start so that the non-discharged wastewater circulates through the circulation pipe 6; adding a reducing agent (e.g., sodium bisulfite solution) into the reaction tank 1 through the dosing port 102 on the reaction tank 1 and through the dosing pipe 2. After the dosing is completed, the third valve 71 is opened, and then compressed air is introduced into the reaction tank 1 through the air inlet 104 on the reaction tank 1 and through the air inlet / water outlet pipe 3 to aerate the non-discharged wastewater. The remaining oxidant in the non-discharged wastewater undergoes a redox reaction with the reducing agent and is removed; controlling the amount of reducing agent added until the oxidant content in the non-discharged wastewater reaches a preset range (e.g., the residual chlorine content is less than 2 mg / L);

[0069] S5: Control the circulation pump 61 to start, so that the non-discharged wastewater circulates through the circulation pipe 6; add acid or alkali solution into the reaction tank 1 through the dosing port 102 on the reaction tank 1 and through the dosing pipe 2. After the dosing is completed, open the third valve 71, and then introduce compressed air into the reaction tank 1 through the air inlet 104 on the reaction tank 1 and through the air inlet / water outlet pipe 3 to aerate the non-discharged wastewater, so that the non-discharged wastewater and the acid or alkali solution react neutrally; control the amount of acid or alkali solution added until the pH value of the non-discharged wastewater reaches a preset range (for example, the pH value reaches 6.0 to 9.0);

[0070] S6: Control the circulation pump 61 to start, so that the non-discharged wastewater circulates through the circulation pipe 6; add a dephosphorus agent (e.g., ferric chloride solution) into the reaction tank 1 through the dosing port 102 on the reaction tank 1 and through the dosing pipe 2. After the dosing is completed, open the third valve 71, and then introduce compressed air into the reaction tank 1 through the air inlet 104 on the reaction tank 1 and through the air inlet / water outlet pipe 3 to aerate the non-discharged wastewater. Phosphates in the non-discharged wastewater react with the dephosphorus agent to form insoluble substances and form a phosphate-containing precipitate; control the dosage of the dephosphorus agent until the total phosphorus content of the non-discharged wastewater reaches a preset range (e.g., the total phosphorus content is less than 0.5 mg / L);

[0071] S7: The non-wastewater in the reaction tank 1 is allowed to stand until the suspended solid content of the supernatant in the non-wastewater reaches a preset range (for example, the suspended solid content is less than 20 mg / L);

[0072] S8: The supernatant in the non-wastewater is discharged to the outside of the reaction tank 1 through the air inlet / water outlet pipe 3 and the water outlet 105;

[0073] S9: The phosphate precipitate in the non-wastewater is discharged to the outside of the reaction tank 1 through the phosphorus discharge port 107.

[0074] As an embodiment, the specific steps of the sequencing batch treatment method for non-radioactive industrial wastewater from a nuclear power plant may be:

[0075] Step 1 - water inlet: Close all valves on the reaction tank 1, discharge non-discharged wastewater into the reaction tank 1 through the water inlet 101 on the reaction tank 1, and stop water inlet when the liquid level in the reaction tank 1 reaches the high liquid level.

[0076] Step 2 - pH adjustment: During the whole step, the circulation pump 61 and the fourth valve 62 are turned on to circulate the non-discharged wastewater through the circulation pipe 6; the acid or alkali solution is added into the reaction tank 1 through the dosing port 102 on the reaction tank 1 and through the dosing pipe 2. After the dosing is completed, the third valve 71 is opened, the second valve 111 is opened, and the external air source is passed through the air inlet 104 on the reaction tank 1 and through the air inlet / water outlet pipe 3 to introduce compressed air into the reaction tank 1 to aerate the non-discharged wastewater, so that the non-discharged wastewater and the acid or alkali solution are neutralized. At the same time, a part of the gas collected by the gas collecting hood 4 enters the dosing pipe 2 through the ventilation pipe 7, so that the liquid in the dosing pipe 2 is discharged; every 20 minutes, the on-site pH analyzer outside the device takes samples from the sampling ports H1 / H2 / H3 for analysis, so that the pH of all samples is between 6.0 and 8.0. If it does not meet the standard, close the third valve 71, add acid or alkali solution again, and open the third valve 71 after the dosing is completed to maintain the non-wastewater circulation, aeration and sampling steps. When the pH monitoring of all samples meets the standard, this step ends.

[0077] Step 3 - Removal of ammonia nitrogen: During the whole step, the circulation pump 61 and the fourth valve 62 are turned on to circulate the non-discharged wastewater through the circulation pipe 6; the oxidant is added into the reaction tank 1 through the dosing port 102 on the reaction tank 1 and the dosing pipe 2. After the dosing is completed, the third valve 71 is opened, the second valve 111 is opened, and the external air source is passed through the air inlet 104 on the reaction tank 1 and the air inlet / water outlet pipe 3 to introduce compressed air into the reaction tank 1 to aerate the non-discharged wastewater and remove the ammonia in the non-discharged wastewater. Nitrogen undergoes a redox reaction with the oxidant to generate nitrogen gas, which is discharged to the outside of the reaction tank 1 through the gas collecting hood 4, the ammonia mist absorber 51 and the nitrogen exhaust pipe 5. Every 20 minutes, an on-site ammonia nitrogen analyzer outside the device takes samples from the sampling ports H1 / H2 / H3 for analysis. If the standards are not met, the third valve 71 is closed and the oxidant is added again. After the addition is completed, the third valve 71 is opened to maintain the non-wastewater circulation, aeration and sampling steps. When the ammonia nitrogen content of all samples meets the standards, this step ends.

[0078] Step 4 - Removal of Excess Oxidant: During this step, the circulation pump 61 and the fourth valve 62 are turned on to circulate the non-discharged wastewater through the circulation pipe 6; the reducing agent is added to the reactor 1 through the dosing port 102 on the reactor 1 and through the dosing pipe 2. After the dosing is completed, the third valve 71 is opened, and the second valve 111 is opened. An external air source is introduced into the reactor 1 through the air inlet 104 on the reactor 1 and through the air inlet / water outlet pipe 3 to aerate the non-discharged wastewater, causing an oxidation-reduction reaction between the excess oxidant and the reducing agent in the non-discharged wastewater and removing it; every 20 minutes, an on-site residual chlorine analyzer outside the device is used to sample and analyze from the sampling ports H1 / H2 / H3 to ensure that the residual chlorine content of all samples is less than 2 mg / L. If the residual chlorine content is not up to standard, the third valve 71 is closed and the reducing agent is added again. After the dosing is completed, the third valve 71 is opened to maintain the non-discharged wastewater circulation, aeration, and sampling steps. This step ends when the residual chlorine content of all samples meets the standard.

[0079] Step 5 - Secondary pH adjustment: This step is the same as the second step. During the whole step, the circulation pump 61 and the fourth valve 62 are turned on to circulate the non-discharged wastewater through the circulation pipe 6; acid or alkali solution is added to the reaction tank 1 through the dosing port 102 on the reaction tank 1 and through the dosing pipe 2. After the dosing is completed, the third valve 71 is opened, the second valve 111 is opened, and the external air source is passed through the air inlet 104 on the reaction tank 1 and through the air inlet / outlet pipe 3 to pass compressed air into the reaction tank 1 to aerate the non-discharged wastewater, so that the non-discharged wastewater and the acid or alkali solution undergo a neutralization reaction. A portion of the gas collected by the gas collecting hood 4 enters the dosing pipe 2 through the ventilation pipe 7, so that the liquid in the dosing pipe 2 is discharged; every 20 minutes, the on-site pH analyzer outside the device takes samples from the sampling ports H1 / H2 / H3 for analysis, so that the pH of all samples is between 6.0 and 8.0. If it does not meet the standard, the third valve 71 is closed and acid or alkali solution is added again. After the dosing is completed, the third valve 71 is opened to maintain the non-wastewater circulation, aeration and sampling steps. When the pH monitoring of all samples meets the standard, this step ends.

[0080] Step 6 - Phosphate Removal: During this step, the circulation pump 61 and the fourth valve 62 are turned on to circulate the non-discharged wastewater through the circulation pipe 6. A dephosphorus remover is added to the reactor 1 through the dosing port 102 on the reactor 1 and the dosing pipe 2. After the dosing is completed, the third valve 71 is opened, and the second valve 111 is opened. An external air source is introduced into the reactor 1 through the air inlet 104 on the reactor 1 and the air inlet / outlet pipe 3 to aerate the non-discharged wastewater, causing the phosphate in the non-discharged wastewater to react with the dephosphorus remover to form an insoluble substance and form a phosphate-containing precipitate. Every 20 minutes, an on-site total phosphorus analyzer outside the device samples and analyzes them from the sampling ports H1 / H2 / H3. If the total phosphorus content does not meet the standard, the third valve 71 is closed and the dephosphorus remover is added again. After the dosing is completed, the third valve 71 is opened, and the non-discharged wastewater circulation, aeration, and sampling steps are maintained. This step ends when the total phosphorus content of all samples meets the standard.

[0081] Step 7 - Standing: Close the circulation pump 61 and all valves, and allow the non-discharged wastewater in the reactor 1 to stand for 1-2 hours. The specific standing time can be determined by observing the precipitation of insoluble matter through the phosphorus discharge mirror 17. Then, an external on-site SS (Suspended Solids) analyzer will take samples from sampling ports H1 / H2 / H3 for analysis. This step is terminated if the suspended solids content of all samples meets the discharge requirements. Otherwise, the standing period continues. During the standing period, the precipitate generated in the non-discharged wastewater sinks into the collection section 1B, and the supernatant in the non-discharged wastewater is located in the main body 1A.

[0082] Step 8 - Drainage: Open the first valve 121 and discharge the supernatant in the non-wastewater to the outside of the reaction tank 1 through the air inlet / water outlet pipe 3 and the water outlet 105 until no supernatant is discharged. Close the first valve 121 and this step ends.

[0083] Step 9 - Phosphorus Discharge: Open the fifth valve 151 and discharge the phosphate-containing precipitate in the non-wastewater to the outside of the reaction tank 1 through the phosphorus discharge port 107 until no precipitate is discharged. Close the fifth valve 151 and this step ends.

[0084] Examples

[0085] A sequencing batch treatment apparatus and method for non-radioactive industrial wastewater from a nuclear power plant is used to treat non-radioactive industrial wastewater generated by the operation of the Hualong One unit at a certain nuclear power plant, removing ammonia nitrogen, phosphates, and suspended solids from the wastewater. The inlet and outlet water quality requirements are shown in the table below.

[0086] Serial number Project Name unit Water inlet value Water output requirements 1 pH / 10.2 6-9 2 Suspended solids SS mg / L 67 ≤20 3 <![CDATA[Ammonia nitrogen (NH3-N)]]> mg / L 180 ≤5 4 Total phosphorus (TP) mg / L 25 ≤0.5

[0087] The structure of the batch treatment unit for non-radioactive industrial wastewater in nuclear power plants is as follows: Figure 1 As shown, the main body 1A of the reaction tank 1 is a cylindrical structure with a diameter of 4000mm. The high liquid level is located at 10.5m of the device and the low liquid level is located at 2.5m of the device. The external interface of the device is arranged as follows Figure 2 The structure of the dosing pipe 2 and the air inlet / water outlet pipe 3 of the device is as shown. Figure 3 and Figure 4 As shown, the diameter of the drug discharge hole 20 on the dosing pipe 2 is 6 mm, and the diameter of the through hole 30 on the air inlet / water outlet pipe 3 is 20 mm.

[0088] The steps of batch operation are as follows:

[0089] Step 1 - water inlet: Close all valves on the reaction tank 1, discharge non-discharged wastewater into the reaction tank 1 through the water inlet 101 on the reaction tank 1, and stop water inlet when the liquid level in the reaction tank 1 reaches the high liquid level.

[0090] Step 2 - pH Adjustment: During this step, the circulation pump 61 and the fourth valve 62 are turned on to circulate the non-discharged wastewater through the circulation pipe 6; 31% hydrochloric acid is added to the reaction tank 1 through the dosing port 102 on the reaction tank 1 and through the dosing pipe 2. After the dosing is completed, the third valve 71 is opened, and the second valve 111 is opened. An external air source is introduced into the reaction tank 1 through the air inlet 104 on the reaction tank 1 and through the air inlet / water outlet pipe 3 to aerate the non-discharged wastewater, causing a neutralization reaction between the non-discharged wastewater and the hydrochloric acid. At the same time, a portion of the gas collected by the gas collection hood 4 enters the dosing pipe 2 through the ventilation pipe 7, thereby draining the liquid in the dosing pipe 2; 20 minutes later, an on-site pH analyzer outside the device is used to sample and analyze from the sampling ports H1 / H2 / H3. The pH of all samples is between 7.5 and 8.0, and this step is completed.

[0091] Step 3 - Removal of ammonia nitrogen: During the whole step, the circulation pump 61 and the fourth valve 62 are turned on to circulate the non-released wastewater through the circulation pipe 6; 10% sodium hypochlorite solution is added to the reaction tank 1 through the dosing port 102 on the reaction tank 1 and through the dosing pipe 2. After the dosing is completed, the third valve 71 is opened, the second valve 111 is opened, and an external air source is passed through the air inlet 104 on the reaction tank 1 and through the air inlet / water outlet pipe 3 into the reaction tank 1 to aerate the non-released wastewater, so that the ammonia nitrogen in the non-released wastewater undergoes an oxidation-reduction reaction with the sodium hypochlorite and generates nitrogen gas, which is discharged to the outside of the reaction tank 1 through the gas collecting hood 4, the ammonia mist absorber 51 and the nitrogen exhaust pipe 5; after 20 minutes, the device The external on-site ammonia nitrogen analyzer takes samples from the sampling ports H1 / H2 / H3 for analysis, and the ammonia nitrogen content drops to 72-78 mg / L; the third valve 71 is closed, and 10% sodium hypochlorite solution is added for the second time. After the addition is completed, the third valve 71 is opened. 20 minutes later, the on-site ammonia nitrogen analyzer outside the device takes samples from the sampling ports H1 / H2 / H3 for analysis, and the ammonia nitrogen content drops to 9-12 mg / L; the third valve 71 is closed, and 10% sodium hypochlorite solution is added for the third time. After the addition is completed, the third valve 71 is opened. 20 minutes later, the on-site ammonia nitrogen analyzer outside the device takes samples from the sampling ports H1 / H2 / H3 for analysis, and the ammonia nitrogen content of all samples is less than 2 mg / L, and this step ends.

[0092] Step 4 - Removal of Excess Oxidant: During this step, the circulation pump 61 and the fourth valve 62 are turned on to circulate the non-discharged wastewater through the circulation pipe 6. A 10% sodium bisulfite solution is added to the reactor 1 through the dosing port 102 on the reactor 1 and via the dosing pipe 2. After the dosing is completed, the third valve 71 is opened, and the second valve 111 is opened. An external air source is introduced into the reactor 1 through the air inlet 104 on the reactor 1 and via the air inlet / water outlet pipe 3 to aerate the non-discharged wastewater, causing an oxidation-reduction reaction between the sodium hypochlorite and the sodium bisulfite in the non-discharged wastewater and removing the excess sodium hypochlorite. After 20 minutes, an on-site residual chlorine analyzer outside the device collects samples from the sampling ports H1 / H2 / H3 for analysis. The residual chlorine content of all samples is less than 2 mg / L, and this step ends.

[0093] Step 5 - Secondary pH adjustment: After step 4, if the pH of the wastewater is still maintained between 6.0 and 8.0, this step is not performed.

[0094] Step 6 - Phosphate Removal: During the entire step, the circulation pump 61 and the fourth valve 62 are turned on to circulate the non-discharged wastewater through the circulation pipe 6; 13% ferric chloride solution is added to the reaction tank 1 through the dosing port 102 on the reaction tank 1 and through the dosing pipe 2. After the dosing is completed, the third valve 71 is opened, the second valve 111 is opened, and compressed air is introduced from an external air source into the reaction tank 1 through the air inlet 104 on the reaction tank 1 and through the air inlet / water outlet pipe 3 to aerate the non-discharged wastewater, so that the phosphate in the non-discharged wastewater is mixed with the chlorine. The ferric chloride reacts with insoluble matter and generates a phosphate-containing precipitate; 20 minutes later, an on-site total phosphorus analyzer outside the device takes samples from the sampling ports H1 / H2 / H3 for analysis, and the total phosphorus content is measured to be reduced to 1.2-1.5 mg / L; the third valve 71 is closed, and 13% ferric chloride solution is added again. After the addition is completed, the third valve 71 is opened, and 20 minutes later, an on-site total phosphorus analyzer outside the device takes samples from the sampling ports H1 / H2 / H3 for analysis, and the total phosphorus content of all samples is less than 0.5 mg / L, and this step is completed.

[0095] Step 7 - Standing: After closing circulation pump 61 and all valves, the non-discharged wastewater in reactor 1 is allowed to stand for 2 hours. A clear boundary between wastewater and sediment is observed through phosphorus-discharge mirror 17. An external SS analyzer, located on-site, analyzes samples from sampling ports H1 / H2 / H3. The suspended solids content is less than 20 mg / L, and this step is concluded. During the standing period, the sediment formed in the non-discharged wastewater settles into collection section 1B, while the supernatant remains in main body 1A.

[0096] Step 8 - Drainage: Open the first valve 121 and discharge the supernatant in the non-wastewater to the outside of the reaction tank 1 through the air inlet / water outlet pipe 3 and the water outlet 105 until no supernatant is discharged. Close the first valve 121 and this step ends.

[0097] Step 9 - Phosphorus Discharge: Open the fifth valve 151 and discharge the phosphate-containing precipitate in the non-wastewater to the outside of the reaction tank 1 through the phosphorus discharge port 107 until no precipitate is discharged. Close the fifth valve 151 and this step ends.

[0098] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A sequencing batch treatment device for non-radioactive industrial wastewater from a nuclear power plant, characterized in that: The invention comprises a reaction tank (1), a dosing pipe (2), an air inlet / water outlet pipe (3), a gas collecting hood (4), a nitrogen exhaust pipe (5), a circulation pipe (6) and a circulation pump (61); the reaction tank (1) comprises a main body (1A) and a collecting part (1B); the collecting part (1B) is fixedly connected to the bottom of the main body (1A); and the cross-sectional area of the collecting part (1B) gradually decreases from top to bottom; a water inlet (101), a dosing port (102) and an upper circulation port (103) are provided on the top side wall of the main body (1A); an air inlet (104) and a water outlet (105) are provided on the bottom side wall of the main body (1A); a lower circulation port (106) is provided on the side wall of the collecting part (1B); and a phosphorus exhaust port (107) is provided at the bottom of the collecting part (1B); The dosing pipe (2) is arranged at the top of the main body (1A), the dosing pipe (2) is communicated with the dosing port (102), and the dosing pipe (2) is provided with a discharge hole (20); the air inlet / water outlet pipe (3) is arranged at the bottom of the main body (1A), the air inlet / water outlet pipe (3) is communicated with the air inlet (104) and the water outlet (105) at the same time, and the air inlet / water outlet pipe (3) is provided with a through hole (30); one end of the circulation pipe (6) is communicated with the lower circulation port (106), and the other end of the circulation pipe (6) is communicated with the upper circulation port (103), and the circulation pump (61) is arranged on the circulation pipe (6); The gas collecting hood (4) is fixedly connected to the top of the main body (1A); the cross-sectional area of the gas collecting hood (4) gradually decreases from bottom to top; the nitrogen exhaust pipe (5) is communicated with the top of the gas collecting hood (4); and an ammonia mist absorber (51) is provided on the nitrogen exhaust pipe (5).

2. The sequencing batch treatment device for non-radioactive industrial wastewater from a nuclear power plant according to claim 1, characterized in that: The main body (1A) is a cylindrical structure, the collecting portion (1B) is an inverted truncated cone structure, and the gas collecting hood (4) is a conical structure; Alternatively, the main body (1A) is a rectangular cylindrical structure, the collecting portion (1B) is an inverted quadrangular pyramid structure, and the gas collecting hood (4) is a quadrangular pyramid structure.

3. The sequencing batch treatment device for non-radioactive industrial wastewater from a nuclear power plant according to claim 1, characterized in that: An air inlet branch pipe (11) and a water outlet branch pipe (12) are provided on the side wall of the main body (1A), and the air inlet branch pipe (11) and the water outlet branch pipe (12) are both located outside the main body (1A). The air inlet (104) is provided at one end of the air inlet branch pipe (11), and the other end of the air inlet branch pipe (11) is communicated with the air inlet / water outlet pipe (3); the water outlet (105) is provided at one end of the water outlet branch pipe (12), and the other end of the water outlet branch pipe (12) is communicated with the air inlet / water outlet pipe (3); a first valve (121) is provided on the water outlet branch pipe (12), and a second valve (111) is provided on the air inlet branch pipe (11).

4. The sequencing batch treatment device for non-radioactive industrial wastewater from a nuclear power plant according to claim 1, characterized in that: It also includes a ventilation pipe (7), one end of which is in communication with the gas collecting hood (4), and the other end of which is in communication with the dosing pipe (2); a third valve (71) is provided on the ventilation pipe (7).

5. The sequencing batch treatment device for non-radioactive industrial wastewater from a nuclear power plant according to claim 4, characterized in that: A drug feed pipe (14) is provided on the side wall of the main body (1A), and the drug feed pipe (14) is located outside the main body (1A). The drug adding port (102) is provided at one end of the drug feed pipe (14), and the other end of the drug feed pipe (14) is connected to the drug adding pipe (2); one end of the ventilation pipe (7) is connected to the drug feed pipe (14).

6. The sequencing batch treatment device for non-radioactive industrial wastewater from a nuclear power plant according to claim 1, characterized in that: The dosing pipe (2) comprises a first main pipe (21) and a plurality of first branch pipes (22), the plurality of first branch pipes (22) are all connected to the first main pipe (21), and the plurality of first branch pipes (22) are arranged at intervals along the length direction of the first main pipe (21), and each of the first branch pipes (22) is provided with a plurality of the drug discharge holes (20) at intervals along the length direction thereof, and one end of the first main pipe (21) is communicated with the dosing port (102); The air inlet / water outlet pipe (3) comprises a second main pipe (31) and a plurality of second branch pipes (32). The plurality of second branch pipes (32) are all connected to the second main pipe (31), and the plurality of second branch pipes (32) are arranged at intervals along the length direction of the second main pipe (31). Each second branch pipe (32) is provided with a plurality of through holes (30) at intervals along the length direction thereof. One end of the second main pipe (31) is simultaneously connected to the air inlet (104) and the water outlet (105).

7. The sequencing batch treatment device for non-radioactive industrial wastewater from a nuclear power plant according to claim 1, characterized in that: A transparent phosphorus-discharging sight glass (17) is provided on the side wall of the collecting portion (1B), and the phosphorus-discharging sight glass (17) extends from the upper end of the collecting portion (1B) to the lower end thereof.

8. The sequencing batch treatment device for non-radioactive industrial wastewater from a nuclear power plant according to any one of claims 1 to 7, characterized in that: A first sampling port (H1), a second sampling port (H2) and a third sampling port (H3) are provided on the side wall of the main body (1A); the first sampling port (H1), the second sampling port (H2) and the third sampling port (H3) are spaced apart from each other from top to bottom; the height of the first sampling port (H1) is the same as the height of the upper circulation port (103); the height of the third sampling port (H3) is the same as the height of the air inlet / water outlet pipe (3); and the second sampling port (H2) is located in the middle between the first sampling port (H1) and the third sampling port (H3).

9. A sequencing batch treatment system for non-radioactive industrial wastewater from a nuclear power plant, characterized in that: The invention comprises a batch treatment device for non-radioactive industrial wastewater from a nuclear power plant according to any one of claims 1 to 8, an acid-base dosing device (81), an oxidant dosing device (82), a reducing agent dosing device (83), a dephosphorization agent dosing device (84), a water inlet pipeline (85) and an air inlet pipeline (86), wherein the acid-base dosing device (81), the oxidant dosing device (82), the reducing agent dosing device (83) and the dephosphorization agent dosing device (84) are all connected to a dosing port (102) on the reaction tank (1), the water inlet pipeline (85) is connected to a water inlet (101) on the reaction tank (1), and the air inlet pipeline (86) is connected to an air inlet (104) on the reaction tank (1).

10. A method for treating non-radioactive industrial wastewater from a nuclear power plant in a batch process, based on the apparatus for treating non-radioactive industrial wastewater from a nuclear power plant according to any one of claims 1 to 8, characterized in that: The method for treating non-radioactive industrial wastewater from a nuclear power plant in a batch process comprises the following steps: S1: Discharge the non-discharged wastewater into the reaction tank (1) through the water inlet (101) on the reaction tank (1); S2: Control the circulation pump (61) to start, so that the non-discharged wastewater circulates through the circulation pipe (6); add acid or alkali solution into the reaction tank (1) through the dosing port (102) on the reaction tank (1) and through the dosing pipe (2); then pass compressed air into the reaction tank (1) through the air inlet (104) on the reaction tank (1) and through the air inlet / water outlet pipe (3) to aerate the non-discharged wastewater, so that the non-discharged wastewater and the acid or alkali solution undergo a neutralization reaction; control the amount of acid or alkali solution added until the pH value of the non-discharged wastewater reaches a preset range; S3: Control the circulation pump (61) to start, so that the non-released wastewater circulates through the circulation pipe (6); add an oxidant into the reaction tank (1) through the dosing port (102) on the reaction tank (1) and through the dosing pipe (2), and then pass compressed air into the reaction tank (1) through the air inlet (104) on the reaction tank (1) and through the air inlet / water outlet pipe (3) to aerate the non-released wastewater; ammonia nitrogen in the non-released wastewater undergoes an oxidation-reduction reaction with the oxidant to generate nitrogen, and the nitrogen is discharged to the outside of the reaction tank (1) through the gas collecting hood (4), the ammonia mist absorber (51) and the nitrogen exhaust pipe (5); control the dosage of the oxidant until the ammonia nitrogen content of the non-released wastewater reaches a preset range; S4: Control the circulation pump (61) to start, so that the non-discharged wastewater circulates through the circulation pipe (6); add a reducing agent into the reaction tank (1) through the dosing port (102) on the reaction tank (1) and through the dosing pipe (2); then pass compressed air into the reaction tank (1) through the air inlet (104) on the reaction tank (1) and through the air inlet / water outlet pipe (3) to aerate the non-discharged wastewater, and the remaining oxidant in the non-discharged wastewater undergoes an oxidation-reduction reaction with the reducing agent and is removed; control the amount of reducing agent added until the oxidant content in the non-discharged wastewater reaches a preset range; S5: Control the circulation pump (61) to start, so that the non-discharged wastewater circulates through the circulation pipe (6); add acid or alkali solution into the reaction tank (1) through the dosing port (102) on the reaction tank (1) and through the dosing pipe (2); then pass compressed air into the reaction tank (1) through the air inlet (104) on the reaction tank (1) and through the air inlet / water outlet pipe (3) to aerate the non-discharged wastewater, so that the non-discharged wastewater and the acid or alkali solution undergo a neutralization reaction; control the amount of acid or alkali solution added until the pH value of the non-discharged wastewater reaches a preset range; S6: Control the circulation pump (61) to start, so that the non-discharged wastewater circulates through the circulation pipe (6); add a dephosphorizing agent into the reaction tank (1) through the dosing port (102) on the reaction tank (1) and through the dosing pipe (2); then pass compressed air into the reaction tank (1) through the air inlet (104) on the reaction tank (1) and through the air inlet / water outlet pipe (3) to aerate the non-discharged wastewater, so that the phosphate in the non-discharged wastewater reacts with the dephosphorizing agent to generate insoluble matter and form a phosphate-containing precipitate; control the dosage of the dephosphorizing agent until the total phosphorus content of the non-discharged wastewater reaches a preset range; S7: allowing the non-wastewater in the reaction tank (1) to stand until the suspended solid content of the supernatant in the non-wastewater reaches a preset range; S8: discharging the supernatant in the non-wastewater to the outside of the reaction tank (1) through the air inlet / water outlet pipe (3) and the water outlet (105); S9: The phosphate-containing precipitate in the non-wastewater is discharged to the outside of the reaction tank (1) through the phosphorus discharge port (107).

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