Catalyst high-salinity wastewater deep denitrification system and method

Abstract

The invention discloses a catalyst high-salinity wastewater deep denitrification system and method.The catalyst high-salinity wastewater deep denitrification system comprises a frame, the top of the frame is fixedly connected with an evaporation tank, the output end of an evaporation pipe is communicated with a connecting pipe, and the side, away from the evaporation tank, of the connecting pipe is communicated with a cooler; the top of the frame is fixedly connected with a biological tank located on one side of the cooler, the output end of the cooler is communicated with a drainage pipe, and the side, away from the cooler, of the drainage pipe extends into the biological tank. Waste water is heated through the evaporation tank, liquid in the waste water is evaporated and forms high-temperature steam, the steam enters the cooler through the connecting pipe for heat exchange treatment, the waste water is condensed into liquid again from the steam state and is injected into the biological pool through the drainage pipe, and the salt content in the waste water can be greatly reduced; meanwhile, the breeding speed of microorganisms in the biological tank can be accelerated by utilizing waste heat, the activity of the microorganisms is ensured, and nitration reaction can be effectively performed.

Description

Technical Field

[0001] The present invention relates to the technical field of high-salt wastewater treatment, and specifically to a deep denitrification system and method for catalyst high-salt wastewater. Background Art

[0002] Catalyst high-salt wastewater mainly comes from the wastewater generated during the catalyst production process. This type of wastewater usually contains high concentrations of salts and organic substances, posing a potential threat to the environment and ecological systems. During the catalyst production process, such as the production of refinery catalysts, a large amount of inorganic acids, bases, and salts are involved, such as sodium hydroxide, hydrochloric acid, sulfuric acid, ammonium salts, etc. These substances may produce sewage mixed with ammonium, sodium sulfate, sodium chloride, and aluminosilicates during the reaction process.

[0003] For example, the patent application number disclosed on the Chinese Patent Network is: 201711407630.0, and the patent name is: A deep denitrification system and method for catalyst high-salt wastewater, including: a coagulation reaction tank, a coagulation sedimentation tank, an MBBR reaction tank, an anaerobic ST packing tank, an aerobic ST packing tank, a high-density sedimentation tank, and an ozone reaction tank connected in sequence. The method includes: the wastewater after coagulation and sedimentation enters the MBBR reaction tank, and the ammonia nitrogen and organic substances in the water are removed through the biofilm on the MBBR packing, and then enters the anaerobic tank equipped with ST bionic packing to remove the total nitrogen in the water by adding a carbon source, and then enters the aerobic tank equipped with ST bionic packing to remove the excess organic substances in the water and reduce the effluent COD. After the denitrification aerobic tank effluent, it enters the high-density tank to ensure the removal of suspended solids, and then enters the ozone device to ensure the stable compliance of the effluent COD.

[0004] However, the existing treatment methods mainly react and eliminate nitrogen through biological treatment. The high-salt environment has an obvious inhibitory effect on the growth and metabolism of microorganisms, increasing the difficulty of wastewater treatment. At the same time, the treatment effect of biological treatment is affected by the reproduction of microorganisms, and the amount of microbial reproduction cannot be precisely controlled, resulting in the need for users to frequently test and monitor the biological wastewater treatment effect.

[0005] Therefore, it is necessary to design and transform the deep denitrification system and method for catalyst high-salt wastewater. Summary of the Invention

[0006] To solve the problems raised in the above background art, the purpose of the present invention is to provide a deep denitrification system and method for catalyst high-salt wastewater, which has the advantage of improving the treatment effect of high-salt wastewater, and solves the problems that the existing treatment methods mainly react and eliminate nitrogen through biological treatment, the high-salt environment has an obvious inhibitory effect on the growth and metabolism of microorganisms, increasing the difficulty of wastewater treatment, and at the same time, the treatment effect of biological treatment is affected by the reproduction of microorganisms, and the amount of microbial reproduction cannot be precisely controlled, resulting in the need for users to frequently test and monitor the biological wastewater treatment effect.

[0007] To achieve the above object, the present invention provides the following technical solutions: A deep denitrification system and method for catalyst high-salt wastewater, including a framework;

[0008] A evaporation tank is fixedly connected to the top of the framework. The output end of the evaporation pipe is communicated with a connecting pipe. The connecting pipe is communicated with a cooler on the side away from the evaporation tank. A biological tank is fixedly connected to the top of the framework on the side of the cooler. The output end of the cooler is communicated with a drain pipe. The drain pipe extends to the inside of the biological tank on the side away from the cooler. An electrolysis tank is fixedly connected to the top of the framework on the back of the biological tank. A water pump is communicated with the top of the electrolysis tank. The input end of the water pump is communicated with a water extraction pipe. The water extraction pipe can extract the liquid discharged from the biological tank on the side away from the water pump. An exhaust pipe is communicated with the top of the electrolysis tank.

[0009] Preferably, a power box is communicated with the surface of the connecting pipe. An impeller is rotatably connected to the inside of the power box through a bearing.

[0010] Preferably, a generator is fixedly connected to the back of the power box. The input end of the generator extends into the power box and is fixedly connected to the surface of the impeller. The output end of the generator is bidirectionally electrically connected to the input ends of the electrolysis tank and the water pump respectively.

[0011] Preferably, a water inlet pipe is arranged on the right side of the evaporation tank. The side of the water inlet pipe close to the evaporation tank is wrapped on the surface of the connecting pipe and is communicated with the right side of the evaporation tank.

[0012] Preferably, a carrier is arranged inside the biological tank. Nitrifying bacteria and denitrifying bacteria are respectively cultured inside the carrier.

[0013] Preferably, an air supply pipe is arranged on the top of the biological tank. One end of the air supply pipe close to the drain pipe penetrates into the drain pipe.

[0014] Preferably, an overflow tank is fixedly connected to the top of the biological tank. The right side of the overflow tank penetrates through the biological tank and extends to the right side of the biological tank.

[0015] Preferably, a storage tank is fixedly connected to the right side of the biological tank. The side of the overflow tank away from the biological tank extends to the top of the storage tank. The water extraction pipe can extract the wastewater inside the storage tank on the side away from the water pump.

[0016] Preferably, the deep denitrification system and method for catalyst high-salt wastewater includes the following steps:

[0017] S1: First, low-temperature catalyst high-salt wastewater is injected into the evaporation tank through the water inlet pipe. The evaporation tank heats the wastewater to evaporate the liquid inside and form high-temperature steam. The steam enters the cooler through the connecting pipe for heat exchange treatment, so that the wastewater is condensed from the steam state into liquid again and injected into the biological pool through the drainage pipe;

[0018] S2: During the steam rising process, it first contacts the impeller inside the power box. The impeller is affected by the steam pressure and drives the generator to rotate and converts the power into electrical energy, so as to achieve the effect of making full use of resources. The low-temperature catalyst high-salt wastewater injected into the water inlet pipe can pre-exchange the steam inside it when it contacts the connecting pipe, reduce the heating pressure of the evaporator, and reduce the temperature loss of the cooler. When the wastewater containing residual heat enters the biological pool, it can use the air supply pipe to carry and inject external air, saving the operation steps of additional aeration of the biological pool. At the same time, the wastewater containing residual heat can accelerate the reproduction of microorganisms and improve the biological treatment effect.

[0019] S3: The purified wastewater uses an overflow tank to take the supernatant, which flows into the storage tank for storage. The water pump uses a suction pipe to extract the pretreated wastewater inside the storage tank and inject it into the electrolytic tank. The electrolytic tank powered by the generator uses the electrons in the cathode to drive the oxidation reaction of nitrogen compounds, converting nitrogen pollutants into gas. At the same time, the electrons will be absorbed by the anode, so that the nitrogen gas is separated from the wastewater and discharged through the exhaust pipe.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. The present invention heats the wastewater through an evaporator to evaporate the liquid inside the wastewater and form high-temperature steam. The steam enters the cooler through a connecting pipe for heat exchange treatment, so that the wastewater is condensed from a steam state into liquid again and injected into the biological pool through a drain pipe, which can greatly reduce the salt content in the wastewater. At the same time, the waste heat can be used to accelerate the reproduction speed of microorganisms in the biological pool, ensure the activity of microorganisms, and effectively carry out nitrification reaction.

[0022] 2. The present invention can eliminate steam pressure by providing a power box and an impeller, and can convert steam pressure into power for utilization.

[0023] 3. The present invention can effectively utilize power by providing a generator, which can be used by a water pump and an electrolytic tank, so that the electrolytic tank, the water pump and the evaporation tank can be operated in linkage.

[0024] 4. The present invention provides a water inlet pipe, and can use the temperature of the injected low-temperature wastewater to pre-treat the steam, thereby reducing the operating pressure of the cooler and preventing the internal temperature of the evaporator from being affected.

[0025] 5. By setting up a carrier, the present invention can facilitate the reproduction of microorganisms and reduce the impact of water flow on the internal biofilm.

[0026] 6. By setting up an air supply pipe, the present invention can utilize the pressure during water flow impact to carry external air directly into the interior of the biological pond, saving the operation steps of additional aeration.

[0027] 7. By setting up an overflow tank, the present invention can effectively discharge the treated wastewater inside the biological pond and reduce the impact caused by bottom sediment.

[0028] 8. By setting up a storage tank, the present invention can statically store the wastewater, facilitating the extraction by a water pump. At the same time, it can effectively collect the remaining wastewater during shutdown to avoid wastewater overflow. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a schematic structural diagram of the present invention;

[0030] Figure 2 is a front view structural diagram of the present invention;

[0031] Figure 3 is a top view structural diagram of the present invention;

[0032] Figure 4 is a rear view structural diagram of the present invention;

[0033] Figure 5 is a partial structural diagram of the present invention;

[0034] Figure 6 is the present invention Figure 4 magnified structural diagram at A in.

[0035] In the figure: 1. Frame; 2. Evaporation tank; 3. Connecting pipe; 4. Cooler; 5. Biological pond; 6. Drain pipe; 7. Electrolysis tank; 8. Water pump; 9. Suction pipe; 10. Exhaust pipe; 11. Power box; 12. Impeller; 13. Generator; 14. Water inlet pipe; 15. Carrier; 16. Air supply pipe; 17. Overflow tank; 18. Storage tank. DETAILED DESCRIPTION OF THE INVENTION

[0036] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0037] Such as Figures 1 to 6As shown, a catalyst high-salt wastewater deep denitrification system and method provided by the present invention comprises a frame 1;

[0038] The top of the frame 1 is fixedly connected to an evaporation tank 2, the output end of the evaporation tube is connected to a connecting pipe 3, the side of the connecting pipe 3 away from the evaporation tank 2 is connected to a cooler 4, the top of the frame 1 is fixedly connected to a biological pool 5 located on one side of the cooler 4, the output end of the cooler 4 is connected to a drain pipe 6, the side of the drain pipe 6 away from the cooler 4 extends to the inside of the biological pool 5, the top of the frame 1 is fixedly connected to an electrolytic tank 7 located on the back of the biological pool 5, the top of the electrolytic tank 7 is connected to a water pump 8, the input end of the water pump 8 is connected to a pumping pipe 9, the side of the pumping pipe 9 away from the water pump 8 can extract the liquid discharged from the biological pool 5, and the top of the electrolytic tank 7 is connected to an exhaust pipe 10.

[0039] refer to Figure 3 The surface of the connecting pipe 3 is connected to a power box 11, and the interior of the power box 11 is movably connected to an impeller 12 through a bearing.

[0040] As a technical optimization solution of the present invention, by providing the power box 11 and the impeller 12, the steam pressure can be eliminated and the steam pressure can be converted into power for utilization.

[0041] refer to Figure 4 A generator 13 is fixedly connected to the back of the power box 11. The input end of the generator 13 extends to the interior of the power box 11 and is fixedly connected to the surface of the impeller 12. The output end of the generator 13 is bidirectionally electrically connected to the input ends of the electrolytic tank 7 and the water pump 8 respectively.

[0042] As a technical optimization solution of the present invention, by providing a generator 13, power can be effectively utilized and can be used by the water pump 8 and the electrolytic tank 7, so that the electrolytic tank 7, the water pump 8 and the evaporation tank 2 can be operated in conjunction.

[0043] refer to Figure 5 A water inlet pipe 14 is provided on the right side of the evaporation tank 2 . The side of the water inlet pipe 14 close to the evaporation tank 2 is wrapped around the surface of the connecting pipe 3 and is connected to the right side of the evaporation tank 2 .

[0044] As a technical optimization solution of the present invention, by setting the water inlet pipe 14, the temperature of the injected low-temperature wastewater can be used to pre-treat the steam, which can reduce the operating pressure of the cooler 4 and avoid affecting the internal temperature of the evaporator 2.

[0045] refer to Figure 4 A carrier 15 is arranged inside the biological pool 5, and nitrifying bacteria and denitrifying bacteria are cultured inside the carrier 15 respectively.

[0046] As a technical optimization solution of the present invention, by setting the carrier 15, it is convenient for the reproduction of microorganisms and reduces the impact of water flow on the internal biofilm.

[0047] Reference Figure 5 , an air supply pipe 16 is provided at the top of the biological tank 5, and one end of the air supply pipe 16 close to the drain pipe 6 penetrates into the inside of the drain pipe 6.

[0048] As a technical optimization solution of the present invention, by setting the air supply pipe 16, the pressure during water flow impact can be used to carry external air directly into the inside of the biological tank 5, saving the operation steps of additional aeration.

[0049] Reference Figure 3 , an overflow tank 17 is fixedly connected to the top of the biological tank 5, and the right side of the overflow tank 17 penetrates through the biological tank 5 and extends to the right side of the biological tank 5.

[0050] As a technical optimization solution of the present invention, by setting the overflow tank 17, the treated wastewater inside the biological tank 5 can be effectively discharged, reducing the impact caused by bottom sediment.

[0051] Reference Figure 4 , a storage tank 18 is fixedly connected to the right side of the biological tank 5, one side of the overflow tank away from the biological tank 5 extends to the top of the storage tank 18, and the side of the water extraction pipe 9 away from the water pump 8 can extract the wastewater inside the storage tank 18.

[0052] As a technical optimization solution of the present invention, by setting the storage tank 18, the wastewater can be statically stored, which is convenient for the water pump 8 to extract. At the same time, the remaining wastewater can be effectively collected during shutdown to avoid wastewater overflow.

[0053] Reference Figure 1 , a deep denitrification system and method for high-salt wastewater of a catalyst, comprising the following steps:

[0054] S1: First, inject the low-temperature catalyst high-salt wastewater into the inside of the evaporation tank 2 through the water inlet pipe 14. The evaporation tank 2 heats the wastewater to evaporate the internal liquid and form high-temperature steam. The steam enters the inside of the cooler 4 through the connecting pipe 3 for heat exchange treatment, so that the wastewater condenses from the steam state into a liquid again and is injected into the inside of the biological tank 5 through the drain pipe 6;

[0055] S2: During the upward floating process of the steam, it first contacts the impeller 12 inside the power box 11. Affected by the steam pressure, the impeller 12 drives the generator 13 to rotate and converts the power into electrical energy, achieving the effect of making full use of resources. The low-temperature catalyst high-salt wastewater injected through the water inlet pipe 14 can pre-exchange heat with the steam inside it when contacting the connecting pipe 3, reducing the heating pressure of the evaporation tank 2 and simultaneously reducing the temperature loss of the cooler 4. The wastewater with residual heat can carry and inject external air using the air supply pipe 16 when entering the biological tank 5, saving the operation steps of additional aeration for the biological tank 5. At the same time, the wastewater with residual heat can accelerate the reproduction of microorganisms and improve the biological treatment effect;

[0056] S3: The purified wastewater uses the overflow tank 17 to take the supernatant, and the supernatant flows into the storage tank 18 for storage. The water pump 8 uses the water suction pipe 9 to extract the pretreated wastewater inside the storage tank 18 and inject it into the electrolytic tank 7. The electrolytic tank 7 powered by the generator 13 uses the electrons in the cathode to drive the oxidation reaction of nitrogen compounds, converting nitrogen pollutants into gases. At the same time, the electrons will be absorbed by the anode, causing the nitrogen gas to separate from the wastewater and be discharged through the exhaust pipe 10.

[0057] The working principle and usage process of the present invention: When in use, first inject the low-temperature catalyst high-salt wastewater into the evaporation tank 2 through the water inlet pipe 14. The evaporation tank 2 heats the wastewater to evaporate the liquid inside and form high-temperature steam. The steam enters the cooler 4 through the connecting pipe 3 for heat exchange treatment, causing the wastewater to condense back into a liquid state from the steam state and be injected into the biological tank 5 using the drain pipe 10. During the upward floating process of the steam, it first contacts the impeller 12 inside the power box 11. Affected by the steam pressure, the impeller 12 drives the generator 13 to rotate and converts the power into electrical energy, achieving the effect of making full use of resources. The low-temperature catalyst high-salt wastewater injected through the water inlet pipe 14 can pre-exchange heat with the steam inside it when contacting the connecting pipe 3, reducing the heating pressure of the evaporation tank 2 and simultaneously reducing the temperature loss of the cooler 4. The wastewater with residual heat can carry and inject external air using the air supply pipe 16 when entering the biological tank 5, saving the operation steps of additional aeration for the biological tank 5. At the same time, the wastewater with residual heat can accelerate the reproduction of microorganisms and improve the biological treatment effect. The purified wastewater uses the overflow tank 17 to take the supernatant, and the supernatant flows into the storage tank 18 for storage. The water pump 8 uses the water suction pipe 9 to extract the pretreated wastewater inside the storage tank 18 and inject it into the electrolytic tank 7. The electrolytic tank 7 powered by the generator 13 uses the electrons in the cathode to drive the oxidation reaction of nitrogen compounds, converting nitrogen pollutants into gases. At the same time, the electrons will be absorbed by the anode, causing the nitrogen gas to separate from the wastewater and be discharged through the exhaust pipe 10.

[0058] In summary, for the deep denitrification system and method of the catalyst high-salt wastewater, the evaporation tank 2 is used to heat the wastewater, so that the internal liquid evaporates to form high-temperature steam. The steam enters the inside of the cooler 4 through the connecting pipe 3 for heat exchange treatment, so that the wastewater condenses from the steam state into a liquid again and is injected into the inside of the biological pond 5 by using the drain pipe 10. This can greatly reduce the salt content in the wastewater. At the same time, the waste heat can be used to accelerate the reproduction speed of microorganisms inside the biological pond 5, ensure the microbial activity, and effectively carry out the nitrification reaction.

[0059] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device.

[0060] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A catalyst high-salinity wastewater deep denitrification system, comprising a frame (1); Features: The top of the frame (1) is fixedly connected to an evaporation tank (2); the output end of the evaporation tube is connected to a connection tube (3); the side of the connection tube (3) away from the evaporation tank (2) is connected to a cooler (4); the top of the frame (1) is fixedly connected to a biological pool (5) located on one side of the cooler (4); the output end of the cooler (4) is connected to a drainage pipe (6); the side of the drainage pipe (6) away from the cooler (4) extends to the inside of the biological pool (5); the top of the frame (1) is fixedly connected to an electrolytic tank (7) located on the back of the biological pool (5); the top of the electrolytic tank (7) is connected to a water pump (8); the input end of the water pump (8) is connected to a water extraction pipe (9); the side of the water extraction pipe (9) away from the water pump (8) is capable of extracting liquid discharged from the biological pool (5); and the top of the electrolytic tank (7) is connected to an exhaust pipe (10).

2. A catalyst high-salt wastewater deep denitrification system according to claim 1, characterized in that: The surface of the connecting pipe (3) is connected to a power box (11), and the interior of the power box (11) is movably connected to an impeller (12) via a bearing.

3. A catalyst high-salt wastewater deep denitrification system and method according to claim 2, characterized in that: A generator (13) is fixedly connected to the back of the power box (11); an input end of the generator (13) extends into the interior of the power box (11) and is fixedly connected to the surface of the impeller (12); and an output end of the generator (13) is bidirectionally electrically connected to the input ends of the electrolytic tank (7) and the water pump (8), respectively.

4. A catalyst high-salt wastewater deep denitrification system according to claim 1, characterized in that: A water inlet pipe (14) is provided on the right side of the evaporation tank (2); the side of the water inlet pipe (14) close to the evaporation tank (2) is wrapped around the surface of the connecting pipe (3) and is in communication with the right side of the evaporation tank (2).

5. A catalyst high-salt wastewater deep denitrification system according to claim 1, characterized in that: A carrier (15) is arranged inside the biological pool (5), and nitrifying bacteria and denitrifying bacteria are cultured inside the carrier (15).

6. A catalyst high-salt wastewater deep denitrification system according to claim 1, characterized in that: An air supply pipe (16) is arranged on the top of the biological pool (5), and one end of the air supply pipe (16) close to the drainage pipe (6) penetrates into the interior of the drainage pipe (6).

7. A catalyst high-salt wastewater deep denitrification system according to claim 1, characterized in that: An overflow trough (17) is fixedly connected to the top of the biological pool (5), the right side of the overflow trough (17) penetrates the biological pool (5) and extends to the right side of the biological pool (5), the right side of the biological pool (5) is fixedly connected to a storage box (18), the side of the overflow trough away from the biological pool (5) extends to the top of the storage box (18), and the side of the water pump (9) away from the water pump (8) can extract wastewater from the storage box (18).

8. A method for deep denitrification of high-salt wastewater using a catalyst according to any one of the above claims, characterized in that: The following steps are involved: S1: First, low-temperature catalyst high-salt wastewater is injected into the interior of the evaporation tank (2) through the water inlet pipe (14). The evaporation tank (2) heats the wastewater to evaporate the liquid inside and form high-temperature steam. The steam enters the interior of the cooler (4) through the connecting pipe (3) for heat exchange treatment, so that the wastewater is condensed from the steam state into liquid again and injected into the interior of the biological pool (5) through the drainage pipe (6); S2: During the steam rising process, the steam first contacts the impeller (12) inside the power box (11). The impeller (12) is affected by the steam pressure to drive the generator (13) to rotate and convert the power into electrical energy, thereby achieving the effect of fully utilizing resources. The low-temperature catalyst high-salt wastewater injected from the water inlet pipe (14) can pre-exchange the steam inside it when it contacts the connecting pipe (3), thereby reducing the heating pressure of the evaporator (2) and reducing the temperature loss of the cooler (4). When the wastewater containing residual heat enters the biological pool (5), the air supply pipe (16) can be used to carry and inject external air, thereby saving the operation step of additional aeration of the biological pool (5). At the same time, the wastewater containing residual heat can accelerate the reproduction of microorganisms and improve the biological treatment effect. S3: The purified wastewater is taken out of the supernatant through the overflow tank (17), and the supernatant is made to flow into the storage box (18) for storage. The water pump (8) uses the pumping pipe (9) to extract the pretreated wastewater in the storage box (18) and inject it into the electrolytic tank (7). The electrolytic tank (7) powered by the generator (13) uses the electrons in the cathode to drive the oxidation reaction of nitrogen compounds, converting nitrogen pollutants into gas. At the same time, the electrons are absorbed by the anode, so that the nitrogen gas is separated from the wastewater and discharged through the exhaust pipe (10).

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