Cooperative treatment method and device for odor and sewage

Abstract

The invention discloses an odor and sewage co-treatment method and device, and the method comprises the following steps: arranging an odor and sewage co-treatment device between the sewage liquid level of an adjusting tank, an anoxic tank and an aerobic tank and a sealing cover plate, and effectively capturing and treating odor by using the odor and sewage co-treatment device; according to the invention, part of sewage in the aerobic tank is uniformly sprayed to the filler layers arranged in the tank bodies through the spray system by virtue of the reflux pump to form a layer of biological membrane, pollution gas can be captured and digested by specific microbial florae every time the pollution gas is in contact with the biological membrane, and the pollution gas can be directly digested by the specific microbial florae due to no direct disturbance of an air draft system. The retention time of the odor below the filler layer is relatively long, the contact area with the filler surface layer is greatly increased, the sewage treatment process and the odor treatment process are organically combined, the retention time of the odor in a treatment facility is effectively prolonged, and the treatment efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of waste gas treatment, and in particular to a method and device for coordinated treatment of odor and sewage. Background Art

[0002] Odor treatment processes generally use biochemical treatment methods, physicochemical treatment methods, or an organic combination of the two. Biochemical treatment mainly involves biological absorption of odor, including biofilter treatment, biological aeration tank treatment, etc.; physicochemical treatment includes plasma discharge treatment, photooxidation treatment, chemical spray treatment, activated carbon adsorption, etc. In order to ensure the treatment effect, the relevant odor treatment technical specifications have clear requirements for the odor collection air volume or ventilation times in the structure, and the odor treatment system has a large exhaust volume. Due to site constraints or cost restrictions, the volume of odor treatment facilities is limited, and large-volume, high-concentration odors stay in the treatment facilities for a very short time, making it difficult to effectively meet emission standards. If the scale of odor treatment equipment is increased, the equipment cost, operating cost, and floor space will increase significantly. If odor treatment is coordinated with sewage treatment, the sewage treatment system equipment is fully utilized, and the pool space on the water surface of the sewage treatment facility is transformed into a part of the odor biochemical treatment facility, the residence time of odor in the treatment facility can be effectively increased, the treatment efficiency can be improved, and at the same time the pollution load of the terminal odor treatment facility can be reduced, the equipment cost can be reduced, and the operating cost and floor space can be saved.

[0003] The disclosed invention patent "A method for the coordinated treatment of sludge odor and sewage odor" (publication number CN112915774A) proposes to collect the spatial odor of the sludge dewatering room and the sewage pretreatment room and send it to the original aeration device of the MBBR pool through a blower, so that the odor is fully in contact with the original mud and water mixture of the MBBR pool, and the original mud and water mixture bacteria in the aeration tank are used to biologically absorb and treat the odor components. This method has many serious defects in the actual operation process and is difficult to implement. Compared with the induced draft used for odor treatment, the sewage aeration fan generally has a large wind pressure and a small air volume, while the induced draft fan used for odor treatment generally has a large air volume and a small wind pressure. The odor air volume collected by the odor collection system is generally much larger than the air volume required for aeration of the aerobic tank of the sewage station. If the air inlet end of the aeration blower of the sewage station is used to directly collect the odor in the treatment facility, and then the odor is sent to the sewage aerobic tank for treatment through the sewage tank aeration system, it will not be able to meet the odor treatment volume requirements per unit time. If a large-volume, high-pressure blower is used to aerate the aerobic pool, excessive aeration will affect the biological operation of the aerobic pool, and the treatment effect will not be achieved, and will cause adverse consequences such as increased equipment investment, increased energy consumption, and increased noise. At the same time, the corrosive components such as hydrogen sulfide and ammonia contained in the odor will corrode the fan impeller and affect the operation of the blower.

[0004] Most importantly, the odor will quickly overflow and diffuse into the terminal odor collection system under the action of water pressure, with an extremely short residence time. The efficiency of aerobic pool mud water in degrading odor is limited.

[0005] If a conventional large-volume, low-pressure odor induced draft fan is used to collect odor under negative pressure, and the aerobic pool is aerated through the induced draft fan, the odor induced draft fan cannot effectively aerate the aerobic pool because the wind pressure of the odor induced draft fan is much lower than the water pressure of the aerobic pool in the sewage station.

[0006] The odor treatment system provided by the patented "Waste Gas Replacement, Collection, Treatment, and Zero Emission System for Wastewater Treatment Plants" (Publication No.: CN219804446 U) solves the contradiction between the small air volume and high air pressure of the sewage pool aeration fan and the large air volume and low air pressure of the odor induced draft fan, but it cannot solve the fundamental problem that the odor stays in the treatment facility for too short a time and is difficult to effectively treat. It is also impossible to effectively reduce the treatment scale of the odor treatment facility through this improvement, and ultimately it is difficult to achieve odor reduction and zero emission. At the same time, in actual operation, it is impossible to strictly seal facilities such as regulating tanks, sludge concentration tanks, and grit chambers. Odors that are not effectively treated are blown into the above-mentioned facilities through induced draft fans, which will cause the diffusion of odorous gases under positive pressure, and the purpose of collecting and treating odors cannot be achieved. Summary of the invention

[0007] The purpose of the present invention is to provide a method and device for the coordinated treatment of odor and sewage, which has the advantage of organically combining the sewage treatment process with the odor treatment process, and solves the problems of short residence time of odor in the treatment facility, low treatment efficiency, and large cost and floor space of odor treatment equipment.

[0008] On the one hand, to achieve the above-mentioned purpose, the present invention provides the following technical solution: a method for co-treatment of odor and sewage, comprising the following steps:

[0009] 1) Arrange an odor and sewage coordinated treatment device between the sewage liquid surface and the sealing cover plate of the regulating tank, the anoxic tank, and the aerobic tank, and use the odor and sewage coordinated treatment device to effectively capture and treat the odor;

[0010] 2) Start the reflux pump installed at the bottom of the aerobic pool, and evenly spray part of the sewage in the aerobic pool onto the packing layers set in the regulating pool, the anoxic pool, and the aerobic pool through the spraying system, so as to provide necessary nutrients and appropriate oxygen for the microorganisms loaded on the surface of the packing layer. After the sprayed sewage enters the regulating pool and the anoxic pool, it is finally returned to the aerobic pool through the suction of the lifting pump and the connecting pipes set between the sewage pool bodies;

[0011] 3) When step 2) is running, the induced draft fan 1 is started synchronously to extract air. Under the action of the induced draft fan 1, a negative pressure is formed in the aerobic tank. Since the enclosed space of the aerobic tank is connected to the regulating tank, the anoxic tank, the sludge dehydration room, the dosing room and other spaces, under the action of atmospheric pressure, the waiting treatment space of the regulating tank, the anoxic tank, the sludge dehydration room, the dosing room also forms a negative pressure, and the odor is degraded after passing through the packing layer set in each tank body;

[0012] 4) In step 2), after the sewage containing suitable oxygen and nutrients in the aerobic pool is sprayed on the packing layer of each pool body, the microbial flora that can degrade odor is promoted to grow and multiply rapidly on the packing layer, thereby forming a biofilm. When the polluted gas contacts the biofilm, it will be captured and digested by the specific microbial flora.

[0013] As a preferred method and device for coordinated treatment of odor and sewage of the present invention, the step 3) also includes separately setting up a second induced draft fan at the facilities to be treated in the sludge dewatering room and the dosing room where the odor concentration is low and the ventilation volume is large, and the odor is drawn into the aerobic tank by the second induced draft fan. After the odor is treated by the packing layer set in the aerobic tank, it is discharged through the first induced draft fan connected to the aerobic tank.

[0014] As a preferred method and device for coordinated treatment of odor and sewage of the present invention, a waste gas deep treatment system is arranged between the air intake of the aerobic pool and the induced draft fan.

[0015] As a preferred method and device for coordinated treatment of odor and sewage of the present invention, the spray system is located between the sealing cover plate and the packing layer, and the water inlet of the spray system is connected to the water outlet of the reflux pump.

[0016] As a preferred method and device for coordinated treatment of odor and sewage of the present invention, an exhaust port 1 is provided at the bottom of the sealing cover plate of the regulating tank and the anoxic tank, an exhaust port 2 is provided at the bottom of the sealing cover plate of the aerobic tank, an air inlet is provided between the sewage liquid surface of the aerobic tank and the bottom layer of the filter screen, the exhaust port 1 is connected to the air inlet of the aerobic tank by an exhaust pipe, the odor in the sludge dehydration room and the dosing room is connected to the air inlet of the aerobic tank through another exhaust pipe, and the exhaust port 2 is connected to the induced draft fan 1 through a pipeline.

[0017] As a preferred device for the coordinated treatment of odor and sewage of the present invention, the waste gas deep treatment system is a built-in activated carbon adsorption device.

[0018] As a preferred device for coordinated treatment of odor and sewage of the present invention, a return pipe is connected between the regulating tank, the anoxic tank and the aerobic tank, and the return pipe is connected to a lift pump to realize the return of sewage to the aerobic tank.

[0019] On the other hand, the present invention also provides a device for coordinated treatment of odor and sewage, including any one of the methods for coordinated treatment of odor and sewage, including a filter screen, wherein the filter screen is provided with multiple layers, and the distance between the topmost filter screen and the normal liquid level of the sewage is not less than 20 centimeters.

[0020] As a preferred device for coordinated treatment of odor and sewage of the present invention, the filter is made of metal material or plastic material.

[0021] As a preferred device for coordinated treatment of odor and sewage of the present invention, the filler layer on the filter screen is made of one or more of plastic hollow balls, ball ring fillers, ceramsite and granular activated carbon materials.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] The present invention uses a reflux pump to spray part of the sewage in the aerobic pool onto the packing layer arranged in each pool body through a spraying system. Since the sewage in the aerobic pool contains suitable oxygen and nutrients, the microbial flora that can degrade odor will grow and reproduce rapidly on the filter material, and finally form a biofilm. Whenever the polluted gas contacts the biofilm, it will be immediately captured and digested by the specific microbial flora. Since a relatively closed interlayer space is formed between the packing layer and the sewage liquid surface, there is no direct disturbance of the exhaust system, so the odor stays under the packing layer for a relatively long time, and the contact area with the surface of the packing is greatly increased, which greatly improves the treatment efficiency of the filter material organisms for odor, organically combines the sewage treatment process with the odor treatment process, effectively prolongs the residence time of the odor in the treatment facility, and improves the treatment efficiency; fully utilizes the sewage treatment facility as a part of the odor treatment facility, and reduces the cost and floor space of the odor treatment equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present invention;

[0025] Figure 2 This is a schematic diagram of the connection state of the induced draft fan 2 according to an embodiment of the present invention;

[0026] Figure 3 It is a schematic diagram of the three-dimensional disassembly of the structures of the regulating tank, the anoxic tank, and the aerobic tank according to an embodiment of the present invention;

[0027] Figure 4 It is a schematic diagram of the structure of a waste gas deep treatment system according to an embodiment of the present invention;

[0028] Figure 5 This is a schematic diagram of the structure breakdown of the exhaust gas deep treatment system according to an embodiment of the present invention;

[0029] Figure 6This is a schematic diagram of the filter screen and filler layer structure of an embodiment of the present invention;

[0030] Figure 7 It is a flowchart of the overall process of an embodiment of the present invention.

[0031] In the figure: 1. Equalization tank; 2. Anoxic tank; 3. Aerobic tank; 4. Dosing room; 5. Sludge dewatering room; 6. Sealing cover; 7. Spraying system; 8. Exhaust pipe; 9. Return pipe; 10. Lifting pump; 11. Return pump; 12. Packing layer; 13. Exhaust gas deep treatment system; 14. Induced draft fan 1; 15. Induced draft fan 2; 16. Activated carbon adsorption device; 17. Exhaust port 1; 18. Filter; 19. Exhaust port 2. DETAILED DESCRIPTION

[0032] Example 1

[0033] See also Figure 1-Figure 7 , a method for co-processing odor and sewage, comprising the following steps:

[0034] 1) Arrange an odor and sewage coordinated treatment device between the sewage liquid surface of the regulating tank 1, the anoxic tank 2, and the aerobic tank 3 and the sealing cover plate 6, and use the odor and sewage coordinated treatment device to effectively capture and treat the odor;

[0035] Since a relatively closed interlayer space is formed between the packing layer 12 and the sewage surface, and there is no direct disturbance of the exhaust system, the odor stays under the packing layer 12 for a relatively long time, and the contact area with the surface of the packing layer 12 is greatly increased, which greatly improves the odor treatment efficiency of the filter material organisms.

[0036] 2) Start the reflux pump 11 installed at the bottom of the aerobic tank 3, and evenly spray part of the sewage in the aerobic tank 3 onto the packing layer 12 provided in the regulating tank 1, the anoxic tank 2, and the aerobic tank 3 through the spraying system 7, so as to provide necessary nutrients and appropriate oxygen for the microorganisms loaded on the surface of the packing layer 12, and after the sprayed sewage enters the regulating tank 1 and the anoxic tank 2, it is finally refluxed into the aerobic tank 3 through the suction of the lifting pump 10 and the connecting pipes provided between the sewage tank bodies;

[0037] Among them, the spray system 7 is located between the sealing cover plate 6 and the packing layer 12, and the water inlet of the spray system 7 is connected to the water outlet of the reflux pump 11. After the spray sewage enters the regulating tank 1 and the anoxic tank 2, it flows back to the aerobic tank 3 through the reflux pipe 9 and the lifting pump 10 arranged between the sewage tank bodies.

[0038] 3) When step 2) is running, the induced draft fan 14 is started synchronously to extract air. Under the action of the induced draft fan 14, a negative pressure is formed in the aerobic tank 3. Since the enclosed space of the aerobic tank 3 is connected with the regulating tank 1, the anoxic tank 2, the sludge dehydration room 5, the dosing room 4 and other spaces, under the action of atmospheric pressure, the waiting treatment space of the regulating tank 1, the anoxic tank 2, the sludge dehydration room 5, the dosing room 4 also forms a negative pressure, and the odor is degraded after passing through the packing layer 12 set in each tank body;

[0039] like Figure 2 As shown, step 3) also includes separately setting up a second induced draft fan 15 at the facilities to be treated where the odor concentration is low and the ventilation volume is large in the sludge dewatering room 5 and the dosing room 4, and using the second induced draft fan 15 to draw the odor into the aerobic tank 3. After the odor is treated by the packing layer 12 set in the aerobic tank 3, it is discharged through the induced draft fan 14 connected to the aerobic tank 3.

[0040] Therefore, an exhaust port 17 is provided at the bottom of the sealing cover plate 6 of the regulating tank 1 and the anoxic tank 2, an exhaust port 2 19 is provided at the bottom of the sealing cover plate 6 of the aerobic tank 3, an air inlet is provided between the sewage liquid surface of the aerobic tank 3 and the bottom filter screen 18, the exhaust port 17 is connected to the air inlet of the aerobic tank 3 by an exhaust pipe 8, the odor in the sludge dehydration room 5 and the dosing room 4 is connected to the air inlet of the aerobic tank 3 through another exhaust pipe 8, and the exhaust port 2 19 is connected to the induced draft fan 14 through a pipeline, thereby realizing the operation of the induced draft fan 14 to extract the odor.

[0041] An exhaust gas deep treatment system 13 is arranged between the exhaust port of the aerobic pool 3 and the induced draft fan 14. The exhaust gas deep treatment system 13 performs deep treatment on the exhaust gas to further reduce the exhaust gas emission.

[0042] In addition, if Figure 4 and Figure 5 As shown, the exhaust gas deep treatment system 13 is a built-in activated carbon adsorption device 16. Before the odor enters the induced draft fan 14, it enters the exhaust gas deep treatment system 13 first, and the activated carbon adsorption device 16 is used to adsorb and purify harmful substances in the odor, thereby reducing the corrosion rate of the induced draft fan 14.

[0043] 4) In step 2), after the sewage containing suitable oxygen and nutrients in the aerobic pool 3 is sprayed on the packing layer 12 of each pool body, the microbial flora that can degrade odor is promoted to grow and reproduce rapidly on the packing layer 12, thereby forming a layer of biofilm. When the polluted gas contacts the biofilm, it will be captured and digested by the specific microbial flora, among which the nitrogen-containing pollutants are converted into NO2- and NO3- by the nitrite bacteria and nitrifying bacteria on the filter layer floccules and the carrier surface, and part of the NO2- and NO3- filter layer denitrifying bacteria are reduced to N2 and discharged into the atmosphere. Some volatile organic pollutants are used as carbon sources and converted into CO2 and H2O; sulfur-containing pollutants are converted into SO32- and SO42- by sulfur-oxidizing bacteria and discharged with the filtrate.

[0044] Example 2

[0045] See also Figure 6 A device for coordinated treatment of odor and sewage comprises a filter screen 18, the filter screen 18 is provided with multiple layers, each layer of the filter screen 18 has a packing layer 12, the filter screen 18 is made of plastic or metal material, the plastic or metal material has corrosion resistance, high strength, and long service life, and the distance between the filter screen 18 at the end and the normal liquid level of the sewage is not less than 20 cm, which provides sufficient residence space for the odor, is conducive to full contact between the odor and the packing, and there is no direct disturbance of the exhaust system, so that the odor stays under the packing layer 12 for a long time, and the contact area with the packing layer 12 is greatly increased, thereby improving the treatment efficiency.

[0046] The filler layer 12 on the filter screen 18 is made of one or more of plastic hollow balls, ball ring fillers, ceramsite and granular activated carbon materials. By selecting a variety of filler materials, efficient treatment of different pollutants can be achieved and the overall treatment effect can be improved.

[0047] Embodiment 3, in combination with Embodiment 1 and Embodiment 2, this embodiment provides a method for co-processing odor and sewage and a working principle of a device for co-processing odor and sewage:

[0048] In summary, when the equipment is in operation, the sewage return pump 11 of the aerobic pool 3 is started, and part of the sewage in the aerobic pool 3 is evenly sprayed onto the packing layer 12 set in each pool body through the spray system 7. Since the sewage in the aerobic pool 3 contains suitable oxygen and nutrients, the microbial flora that can degrade odor will grow and multiply rapidly on the filter material, and eventually form a layer of biofilm. Whenever the polluted gas contacts the biofilm, it will be immediately captured and digested by the specific microbial flora. Among them, nitrogen-containing pollutants are converted into NO2- and NO3- by the nitrite bacteria and nitrifying bacteria on the filter material layer floccules and the surface of the carrier, and part of the NO2- and NO3- are reduced to N2 by the denitrifying bacteria in the filter material layer and discharged into the atmosphere. Some volatile organic pollutants are used as carbon sources and converted into CO2 and H2O; sulfur-containing pollutants are converted into SO32- and SO42- by sulfur-oxidizing bacteria and discharged with the filtrate;

[0049] Since a relatively closed interlayer space is formed between the packing layer 12 and the sewage surface, and there is no direct disturbance of the exhaust system, the odor stays under the filter material layer for a relatively long time, and the contact area with the filter material surface is greatly increased, which greatly improves the odor treatment efficiency of the filter material organisms. After the spray sewage enters the regulating tank 1 and the anoxic tank 2, it passes through the connecting pipes arranged between the sewage tank bodies and finally flows back to the aerobic tank 3;

[0050] When the equipment is running, the induced draft fan 14 is started synchronously to extract air. Under the action of the induced draft fan 14, negative pressure is formed in the aerobic tank 3. Since the aerobic tank 3 is a closed space and is connected to the regulating tank 1, the anoxic tank 2, the sludge dehydration room 5, and the dosing room 4, under the action of atmospheric pressure, the waiting treatment space of the regulating tank 1, the anoxic tank 2, the sludge dehydration room 5, and the dosing room 4 also forms a negative pressure, and the odor is degraded after passing through the biological filter bed arranged in the tank body.

[0051] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for co-processing odor and sewage, characterized in that: The following steps are involved: 1) Arrange an odor and sewage coordinated treatment device between the sewage liquid surface and the sealing cover plate of the regulating tank, the anoxic tank, and the aerobic tank, and use the odor and sewage coordinated treatment device to effectively capture and treat the odor; 2) Start the reflux pump installed at the bottom of the aerobic pool, and evenly spray part of the sewage in the aerobic pool onto the packing layers set in the regulating pool, the anoxic pool, and the aerobic pool through the spraying system, so as to provide necessary nutrients and appropriate oxygen for the microorganisms loaded on the surface of the packing layer. After the sprayed sewage enters the regulating pool and the anoxic pool, it is finally returned to the aerobic pool through the suction of the lifting pump and the connecting pipes set between the sewage pool bodies; 3) When step 2) is running, the induced draft fan 1 is started synchronously to extract air. Under the action of the induced draft fan 1, a negative pressure is formed in the aerobic tank. Since the enclosed space of the aerobic tank is connected to the regulating tank, the anoxic tank, the sludge dehydration room, the dosing room and other spaces, under the action of atmospheric pressure, the waiting treatment space of the regulating tank, the anoxic tank, the sludge dehydration room, the dosing room also forms a negative pressure, and the odor is degraded after passing through the packing layer set in each tank body; 4) In step 2), after the sewage containing suitable oxygen and nutrients in the aerobic pool is sprayed on the packing layer of each pool body, the microbial flora that can degrade odor is promoted to grow and multiply rapidly on the packing layer, thereby forming a biofilm. When the polluted gas contacts the biofilm, it will be captured and digested by the specific microbial flora.

2. The method for coordinated treatment of odor and sewage according to claim 1, characterized in that: The step 3) also includes separately setting up a second induced draft fan at the facilities to be treated in the sludge dehydration room and the dosing room where the odor concentration is low and the ventilation volume is large, and using the second induced draft fan to draw the odor into the aerobic tank. After the odor is treated by the packing layer set in the aerobic tank, it is discharged through the first induced draft fan connected to the aerobic tank.

3. The method for coordinated treatment of odor and sewage according to claim 2, characterized in that: An exhaust gas deep treatment system is arranged between the air intake of the aerobic pool and the induced draft fan.

4. The method for coordinated treatment of odor and sewage according to claim 3, characterized in that: The spray system is located between the sealing cover plate and the packing layer, and the water inlet of the spray system is connected to the water outlet of the reflux pump.

5. The method for coordinated treatment of odor and sewage according to claim 4, characterized in that: The bottom of the sealing cover plates of the regulating tank and the anoxic tank is provided with an exhaust port 1, the bottom of the sealing cover plate of the aerobic tank is provided with an exhaust port 2, an air inlet is provided between the sewage liquid surface of the aerobic tank and the bottom layer of the filter screen, the exhaust port 1 is connected to the air inlet of the aerobic tank by an exhaust pipe, the odor in the sludge dehydration room and the dosing room is connected to the air inlet of the aerobic tank through another exhaust pipe, and the exhaust port 2 is connected to the induced draft fan 1 through a pipeline.

6. The method for coordinated treatment of odor and sewage according to claim 5, characterized in that: The exhaust gas deep treatment system is a built-in activated carbon adsorption device.

7. The method for coordinated treatment of odor and sewage according to claim 6, characterized in that: A return pipe is connected between the regulating tank, the anoxic tank and the aerobic tank, and the return pipe is connected to the lifting pump to realize the return of sewage to the aerobic tank.

8. A device for coordinated treatment of odor and sewage, comprising the method for coordinated treatment of odor and sewage according to any one of claims 1 to 7, characterized in that: Including a filter screen, the filter screen is arranged with multiple layers, and the distance between the top layer of the filter screen and the normal liquid level of the sewage is not less than 20 centimeters.

9. The odor and sewage coordinated treatment device according to claim 8 is characterized in that: The filter screen is made of metal material or plastic material.

10. The odor and sewage coordinated treatment device according to claim 9, characterized in that: The filler layer on the filter screen is made of one or more of plastic hollow balls, ball ring fillers, ceramsite and granular activated carbon materials.

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