CN113634103A - Odor treatment system for resource utilization of organic wastes - Google Patents
Odor treatment system for resource utilization of organic wastes Download PDFInfo
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- CN113634103A CN113634103A CN202110966942.5A CN202110966942A CN113634103A CN 113634103 A CN113634103 A CN 113634103A CN 202110966942 A CN202110966942 A CN 202110966942A CN 113634103 A CN113634103 A CN 113634103A
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- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/007—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by irradiation
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
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- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
- B01D53/025—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with wetted adsorbents; Chromatography
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B01D53/34—Chemical or biological purification of waste gases
- B01D53/346—Controlling the process
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B01D—SEPARATION
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- B01D53/34—Chemical or biological purification of waste gases
- B01D53/38—Removing components of undefined structure
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B01D—SEPARATION
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- B01D53/46—Removing components of defined structure
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
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- Engineering & Computer Science (AREA)
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- Chemical Kinetics & Catalysis (AREA)
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- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Biomedical Technology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Molecular Biology (AREA)
- Toxicology (AREA)
- Processing Of Solid Wastes (AREA)
- Physical Water Treatments (AREA)
Abstract
The invention relates to the field of nondestructive testing, in particular to an odor treatment system for recycling organic wastes. The odor treatment system comprises: the device comprises a gas collection mechanism, at least two ultraviolet photolysis purifiers, a washing tank, an adsorption bin, a biological digestion bin, a sterilization device and a controller. Wherein, two ultraviolet photolysis purifiers are installed side by side at the back end in air-collecting opening, and the washing pond includes alkaline pond and acid pond, and the absorption storehouse is installed at the washing pond back end, including casing and inside adsorption filler. The biological digestion bin is arranged at the rear section of the adsorption bin and contains biological digestion solution; the biological digestion solution comprises microbial flora composed of Enterobacter agglomerans, Lactobacillus acidophilus, Bacillus polymyxa and Acinetobacter. The sterilization device is used for sterilizing the tail gas discharged from the discharge port. The invention solves the problems that the existing deodorization process of the composting farm is not thorough in deodorization, is difficult to deal with scenes with large flow of odorous gas and has lower odor treatment efficiency.
Description
Technical Field
The invention relates to the field of nondestructive testing, in particular to an odor treatment system for recycling organic wastes.
Background
The livestock manure, the straws and the like are high-quality compost materials and can be used for producing the bio-organic fertilizer. However, because these materials contain a large amount of available organic matters, various harmful microorganisms are easy to breed in the natural composting process, and when the harmful microorganisms decompose the organic matters, various types of odor gases are generated, so that the environmental pollution is caused, and the health of workers or residents around the composting site is influenced.
The existing methods for treating odor mainly comprise a combustion method, a water washing method, an adsorption method, a physical dilution method and the like, and all the methods have certain deodorization effect. However, for complex foul smell gas generated in the composting process of excrement and straw, the problems of incomplete deodorization, difficulty in coping with scenes with large flow of foul smell gas and low treatment efficiency still exist.
Disclosure of Invention
Based on the above, the problems that the existing deodorization process of the composting farm is not thorough in deodorization, is difficult to deal with scenes with large flow of odorous gas and is low in odor treatment efficiency are necessarily solved; provides an odor treatment system for resource utilization of organic waste.
The invention provides an odor treatment system for resource utilization of organic wastes, which is used for harmlessly treating odor generated in the composting treatment process of the organic wastes. The odor treatment system comprises: the device comprises a gas collection mechanism, at least two ultraviolet photolysis purifiers, a washing tank, an adsorption bin, a biological digestion bin, a sterilization device and a controller.
The gas collecting mechanism is used for collecting odor gas to be treated and discharging the gas to the rear section; the gas collection mechanism comprises a gas collection opening, a fan and an exhaust pipe.
Two ultraviolet photolysis purifiers are installed in parallel at the back end of air collecting opening, and the gas that the air collecting mechanism was collected is discharged and is handled in ultraviolet photolysis purifier's treatment cavity. The ultraviolet photolysis purifier is internally provided with a catalyst and an ultraviolet lamp; the catalyst is nano-platinum particles and nano-titanium dioxide which are dispersed on a molecular sieve carrier. Irradiating the surface of the catalyst by the light of the ultraviolet lamp; the inlet and the outlet of the treatment cavity in the ultraviolet photolysis purifier are respectively provided with a first electromagnetic valve and a second electromagnetic valve. And a gas flowmeter is also arranged at the inlet of the treatment cavity of each ultraviolet photolysis purifier.
The washing pond is installed at ultraviolet photolysis clarifier back end, including alkaline pond and acid pond for carry out alkaline washing and acid washing in proper order to the gas that flows through. A first check valve is disposed between the uv photolysis purifier and the alkaline cell, the first check valve allowing only fluid from the uv photolysis purifier to enter the alkaline cell. A second check valve is arranged between the alkaline tank and the acid tank; the second check valve allows fluid to enter the acid tank only from the alkaline tank.
The adsorption bin is arranged at the rear section of the washing tank and is used for adsorbing gas discharged from the washing tank. The adsorption bin comprises a shell and an internal adsorption filler. The housing has an inlet and an outlet, the outlet being located at the top of the housing, the inlet being located at the bottom of the housing, and the inlet extending through the conduit to a level flush with the height of the outlet. The adsorption filler is of a multi-layer structure vertically arranged and sequentially comprises a zeolite section, a steel slag section and an ash slag section from bottom to top; the adsorbent packing is immersed in a sodium bicarbonate solution.
The biological digestion bin is arranged at the rear section of the adsorption bin and is used for carrying out biological digestion treatment on the residual gas discharged from the adsorption bin. The biological digestion bin contains biological digestion solution; the biological digestion solution comprises a microbial flora consisting of Enterobacter agglomerans, Lactobacillus acidophilus, Bacillus polymyxa and Acinetobacter, and nutrients required for supporting the life activities of the microbial flora. The top of the biological digestion bin comprises a discharge port for discharging the treated tail gas. The biological digestion bin is internally provided with a temperature sensor and a dissolved oxygen sensor which are used for monitoring the properties of the biological digestion solution.
The sterilizing device is arranged at the discharge port of the biological digestion bin and is used for sterilizing tail gas discharged from the discharge port.
The controller is used for obtaining the detection result of the gas flowmeter, controlling the running states of the first electromagnetic valve, the second electromagnetic valve and the ultraviolet lamp according to the detection value of the gas flowmeter and completing a photocatalytic cracking cycle. The controller is also used for obtaining the detection results of the temperature sensor and the dissolved oxygen sensor and sending out a corresponding alarm signal when the detection value exceeds a preset warning threshold value; the controller is also used for controlling the running state of the fan.
Preferably, a backflow preventer is arranged between the washing tank and the adsorption bin and between the adsorption bin and the biological digestion bin to prevent the solution in the adsorption bin and the biological digestion bin from entering the front-end equipment.
Preferably, in the uv photolysis purifier, the control process of one complete photocatalytic cracking cycle is as follows:
in the initial state, only one of the respective uv photolysis purifiers is maintained in a state of receiving the gas discharged from the front end. The controller closes the second electromagnetic valve of the ultraviolet photolysis purifier, obtains the detection result of the gas flowmeter, and closes the first electromagnetic valve of the ultraviolet photolysis purifier to stop receiving gas when the accumulated flow of the gas flowmeter in the current period reaches a specified threshold value. And the ultraviolet lamp is turned on to perform a photocatalytic cracking treatment cycle. And after the treatment is finished, opening the second electromagnetic valve to discharge the treated gas. Meanwhile, when the current ultraviolet photolysis purifier is in a photocatalytic cracking treatment stage, the controller switches the rest ultraviolet photolysis purifiers to keep a receiving state.
Preferably, the installation heights of the washing tank, the adsorption bin and the biological digestion bin are sequentially reduced.
Preferably, the water washing liquid adopted in the alkaline pool is a sodium hydroxide solution with the pH value of 8.5-9.0; the water washing solution adopted in the acid tank is a sulfuric acid solution with the pH value of 5.5-6; the water washing pool is also provided with a PH meter which is used for regularly monitoring the pH value of the water washing liquid in the alkaline pool and the acid pool; the controller obtains the detection result of the PH meter and sends a corresponding alarm signal when the detection value exceeds a specified threshold value to remind a manager to supplement medicaments to the corresponding alkaline pool and the acid pool.
Preferably, the PH meter is further configured to monitor the PH value of the bio-digestion solution periodically, and the controller obtains a corresponding detection result and sends a corresponding alarm signal when the PH value of the bio-digestion solution exceeds a predetermined threshold value, so as to remind a manager to adjust the PH value of the bio-digestion solution to a preset safety interval.
Preferably, in the adsorption filler, the particle size of the material of the zeolite section is 6-10mm, and the particle size of the material of the steel slag section is 5-7 mm; the particle size of the material of the ash residue section is 2-4 mm; the ash slag section is made of combustion ash slag of biomass fuel; the porosity of the ash is more than 30%.
Preferably, the biological digestion tank also comprises an aeration device which is used for oxygenating the biological digestion solution so as to keep the dissolved oxygen in the biological digestion solution not less than 1.8 mg/L; the controller is used for obtaining the detection result of the dissolved oxygen sensor and controlling the aeration device to complete primary aeration when the detection value is lower than 1.8mg/L, so that the dissolved oxygen in the biological digestion solution is increased.
Preferably, a stirring device is further arranged in the biological digestion tank and used for periodically stirring the biological digestion solution, and the stirring device is electrically connected with the controller.
Preferably, the sterilization device is a high-temperature sterilization box, the treatment temperature of the tail gas in the high-temperature sterilization box is higher than 140 ℃, and an auxiliary ultraviolet sterilization device is further arranged at the rear end of the high-temperature sterilization box.
The odor treatment system for resource utilization of organic wastes provided by the invention has the following beneficial effects:
1. the odor treatment system sequentially carries out four procedures of photocatalytic cracking, acid-base washing, physical adsorption and biological digestion treatment on various odor gases generated in the organic matter composting process in a harmless way. Can effectively treat various gas components generated in the composting fermentation process, and has very thorough deodorization effect.
2. The system provided by the invention has higher treatment efficiency, can treat gas with larger flow rate at the same time, is particularly suitable for rapidly treating odor gas with large flow rate in a farm and the like, and has very high practical value.
3. The system provided by the invention can efficiently utilize different waste resources such as steel slag and fuel ash in the treatment process, saves the waste gas treatment cost, effectively utilizes the waste resources, and has high environmental protection benefit and ecological value.
4. The odor treatment system provided by the invention realizes automatic monitoring and automatic control of the equipment operation process through the controller and the sensor. The degree of manual intervention can be reduced, and the management cost of the system is reduced; meanwhile, the whole process of the system operation can be sealed, the contact between managers and harmful gases is reduced, and the safety of the system and the personnel is improved.
Drawings
Fig. 1 is a schematic view of a system structure of an odor treatment system for resource utilization of organic waste according to embodiment 1 of the present invention;
FIG. 2 is a schematic view showing the structure and layout of the UV photolysis purifier in example 1 of the present invention;
FIG. 3 is a schematic structural view of a water washing tank in example 1 of the present invention;
FIG. 4 is a schematic structural view of an adsorption silo in embodiment 1 of the present invention;
FIG. 5 is a schematic block diagram illustrating the connection of control units in the odor treatment system for recycling organic waste in accordance with embodiment 1 of the present invention;
fig. 6 is a flowchart of a method for a biological treatment process of odor generated by the chicken manure resource utilization in example 2 of the present invention.
Labeled as: 1. a gas collection mechanism; 2. an ultraviolet photolysis purifier; 3. a water washing pool; 4. an adsorption bin; 5. a biological digestion bin; 6. a sterilization device; 7. a backflow preventer; 8. a pH meter; 51. a stirring device; 52. an aeration device; 11. an air collecting opening; 12. an exhaust duct; 13. a fan; 21. an ultraviolet lamp; 22. a catalyst; 23. a first solenoid valve; 24. a second solenoid valve; 25. a gas flow meter; 31. an alkaline tank, 32 and an acidic tank; 33. a first check valve; 34. a second check valve; 41. a housing; 42. adsorbing the filler; 53. a temperature sensor; 54. a dissolved oxygen sensor; 100. a controller; 411. an inlet; 412. an outlet; 420. sodium bicarbonate solution; 421. a clinker section; 422. a steel slag section; 423. a zeolite stage.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "or/and" includes any and all combinations of one or more of the associated listed items.
Example 1
The embodiment provides an odor treatment system for resource utilization of organic wastes, which is used for harmlessly treating odor gas generated in the composting process of the organic wastes. As shown in fig. 1, the odor treatment system includes: the device comprises a gas collection mechanism 1, at least two ultraviolet photolysis purifiers 2, a washing pool 3, an adsorption bin 4, a biological digestion bin 5, a sterilization device 6 and a controller 100.
The gas collecting mechanism 1 is used for collecting odor gas to be treated and discharging the gas to the rear section; the gas collection mechanism 1 comprises a gas collection opening 11, a fan 13 and an exhaust pipe 12.
As shown in fig. 2, two uv photolysis purifiers 2 are installed in parallel at the rear section of the air collecting opening 11, and the gas collected by the gas collecting mechanism 1 is discharged into the processing chamber of the uv photolysis purifier 2 for processing. The ultraviolet photolysis purifier 2 is provided with a catalyst 22 and an ultraviolet lamp 21; the catalyst 22 is nano-platinum particles and nano-titanium dioxide dispersed on a molecular sieve carrier. The light from the ultraviolet lamp 21 is irradiated on the surface of the catalyst 22; the inlet and the outlet of the treatment chamber of the uv photolysis purifier 2 are respectively provided with a first solenoid valve 23 and a second solenoid valve 24. A gas flow meter 25 is further provided at the inlet of the treatment chamber of each uv photolysis purifier 2.
In the UV photolysis purifier 2, a complete photocatalytic cracking cycle is controlled as follows: in the initial state, only one of the ultraviolet photolysis purifiers 2 is maintained in a state of receiving the gas discharged from the front end. The controller 100 closes the second solenoid valve 24 of the photolysis purifier 2 and obtains the detection result of the gas flow meter 25, and when the accumulated flow rate of the gas flow meter 25 in the current period reaches a predetermined threshold, the controller 100 closes the first solenoid valve 23 of the photolysis purifier 2 and stops receiving the gas. And the ultraviolet lamp 21 is turned on to perform one photocatalytic cracking treatment cycle. After the treatment is completed, the second solenoid valve 24 is opened to discharge the treated gas. Meanwhile, the controller 100 switches the remaining uv photolysis purifiers 2 to maintain the receiving state when the current uv photolysis purifier 2 is in the photocatalytic degradation process stage.
As shown in fig. 3, the washing tank 3 is installed at a rear stage of the uv photolysis purifier 2, and includes an alkaline tank 31 and an acidic tank 32 for sequentially performing alkaline washing and acidic washing on the gas flowing therethrough. A first check valve 33 is disposed between the uv photolysis purifier 2 and the alkaline cell 31, the first check valve 33 allowing only fluid from the uv photolysis purifier 2 to enter the alkaline cell 31. A second check valve 34 is arranged between the alkaline tank 31 and the acid tank 32; the second check valve 34 only allows fluid from the alkaline tank 31 to enter the acid tank 32.
The water washing solution adopted in the alkaline pool 31 is a sodium hydroxide solution with the pH value of 8.5-9.0; the water washing solution adopted in the acid tank 32 is a sulfuric acid solution with the pH value of 5.5-6; a pH meter 8 is also arranged in the washing tank 3, and the pH meter 8 is used for regularly monitoring the pH value of the washing liquid in the alkaline tank 31 and the acidic tank 32; the controller 100 acquires the detection result of the PH meter 8 and sends a corresponding alarm signal when the detection value exceeds a predetermined threshold value, thereby reminding a manager to replenish the chemicals into the corresponding alkaline tank 31 and the acidic tank 32.
As shown in fig. 4, the adsorption bin 4 is installed at the rear end of the rinsing tank 3, and is used for performing adsorption treatment on the gas discharged from the rinsing tank 3. The adsorption bin 4 includes a housing 41 and an adsorption packing 42 inside. The housing 41 has an inlet 411 and an outlet 412, the outlet 412 being located at the top of the housing 41, the inlet 411 being located at the bottom of the housing 41, and the inlet 411 extending up through the duct to be level with the outlet 412. The adsorption packing 42 is a multi-layer structure vertically arranged and sequentially comprises a zeolite section 423, a steel slag section 422 and an ash section 421 from bottom to top; adsorbent packing 42 is immersed in sodium bicarbonate solution 420.
This structural design who adsorbs storehouse 4 not only can realize good adsorption effect, slows down gaseous through-speed, can also have the effect that prevents the solution outflow.
In the adsorption filler 42, the material grain diameter of the zeolite section 423 is 6-10mm, and the material grain diameter of the steel slag section 422 is 5-7 mm; the particle size of the material of the ash residue section 421 is 2-4 mm; the material of the ash section 421 is combustion ash of biomass fuel; the porosity of the ash is more than 30%.
The biological digestion bin 5 is arranged at the rear section of the adsorption bin 4 and is used for carrying out biological digestion treatment on the residual gas discharged from the adsorption bin 4. The biological digestion bin 5 contains biological digestion solution; the biological digestion solution comprises a microbial flora consisting of Enterobacter agglomerans, Lactobacillus acidophilus, Bacillus polymyxa and Acinetobacter, and nutrients required for supporting the life activities of the microbial flora. The top of the biological digestion bin 5 comprises a discharge port for discharging the treated tail gas. The biological digestion bin 5 is provided with a temperature sensor 53 and a dissolved oxygen sensor 54 for monitoring the properties of the biological digestion solution.
In this embodiment, the PH meter 8 is further configured to monitor the PH value of the bio-digestion solution periodically, and the controller 100 obtains a corresponding detection result and sends a corresponding alarm signal when the PH value of the bio-digestion solution exceeds a predetermined threshold value, so as to remind a manager to adjust the PH value of the bio-digestion solution to a preset safety range.
The biological digestion tank also comprises an aeration device 52, the aeration device 52 is used for oxygenating the biological digestion solution so as to keep the dissolved oxygen in the biological digestion solution not less than 1.8 mg/L; the controller 100 is configured to obtain a detection result of the dissolved oxygen sensor 54, and control the aeration device 52 to complete primary aeration when the detection value is lower than 1.8mg/L, so as to increase the dissolved oxygen in the bio-digestion solution. The biological digestion tank is further provided with a stirring device 51, the stirring device 51 is used for periodically stirring the biological digestion solution, and the stirring device 51 is electrically connected with the controller 100.
A backflow preventer 7 is arranged between the washing tank 3 and the adsorption bin 4 and between the adsorption bin 4 and the biological digestion bin 5 to prevent the solution in the adsorption bin 4 and the biological digestion bin 5 from entering the front-end equipment. The installation heights of the rinsing pond 3, the adsorption bin 4 and the biological digestion bin 5 are reduced in sequence. The installation or construction mode is also adopted to prevent the backflow of the system in the operation process.
The sterilizing device 6 is arranged at the discharge port of the biological digestion bin 5 and is used for sterilizing the tail gas discharged from the discharge port. The sterilization device 6 is a high-temperature sterilization box, the treatment temperature of the tail gas in the high-temperature sterilization box is higher than 140 ℃, and the rear end of the high-temperature sterilization box is also provided with an auxiliary ultraviolet sterilization device 6.
As shown in fig. 5, the controller 100 is configured to obtain the detection result of the gas flow meter 25, and control the operation states of the first electromagnetic valve 23, the second electromagnetic valve 24 and the ultraviolet lamp 21 according to the detection value of the gas flow meter 25, thereby completing a photocatalytic cracking cycle. The controller 100 is further configured to obtain detection results of the temperature sensor 53 and the dissolved oxygen sensor 54, and send a corresponding alarm signal when the detection values exceed a preset alarm threshold; the controller 100 is also used to control the operating state of the fan 13.
The following description is provided with reference to the operation process of the odor treatment system for recycling organic waste provided by this embodiment; the function and effect of the product provided by the present embodiment will be explained.
The odor treatment equipment is mainly installed near a composting workshop of an organic fertilizer production factory and is used for carrying out innocent treatment on fermentation gas in the composting production process. Wherein, the air collecting port 11 of the air collecting mechanism 1 is installed in the composting workshop, and the air collecting mechanism 1 extracts the air in the composting workshop through the fan 13 and the exhaust pipe 12 and discharges the air to the rear end.
In the present embodiment, the gas collected at the front end is mainly delivered to the rear end by the fan 13 in the gas collecting mechanism 1 as a power source, and is processed in different steps. In a specific construction process, when a single fan 13 cannot meet the odor delivery requirement after the system is scaled up, the fan 13 or other gas delivery devices can be appropriately added among various devices of the system. To meet the requirements for implementing the entire process flow.
In this embodiment, the collected odor first passes through the uv photolysis purifier 2, and the treatment process of the uv photolysis purifier 2 needs to be reacted in the treatment chamber for a certain treatment period, so the treatment process of this stage is not matched with the back-end continuous process. In view of this problem, the present embodiment provides at least two uv photolysis purifiers 2. With this arrangement, when one of the ultraviolet photolysis purifiers 2 is in the odor treatment stage, the odor collection can be performed by using the other ultraviolet photolysis purifier 2. The two are mutually matched to realize the continuous treatment of the waste gas in the whole flow.
In the ultraviolet photolysis purifier 2 of the present embodiment, the outlet of the treatment chamber and how to set up the solenoid valve are both matched through the switching strategy of the solenoid valve. In the catalytic cracking process, after the gas flowmeter 25 detects that the gas in the treatment cavity reaches a certain concentration, the electromagnetic valves at the front end and the rear end of the treatment cavity are closed, the ultraviolet lamp 21 is opened to generate high-energy UV light beams, and the light beams irradiate the surface of the molecular sieve carrierUnder the excitation of high-energy ultraviolet rays and the catalytic action of the catalyst 22, macromolecular organic matters in the odorous gas can generate various chemical reactions such as ring opening, cracking and the like, and are degraded into odorless micromolecules including CO2And H2O, etc.; meanwhile, partial oxygen generated by the high-energy ultraviolet light beam is converted into ozone molecules, the ozone absorbs ultraviolet rays to generate oxygen radicals and oxygen, the oxygen radicals have ideal activity and can be combined with water vapor to generate hydroxyl radicals, and the hydroxyl radicals have strong oxidizing property, so that alcohols, aldehydes and carboxylic acid substances in odor molecules can be oxidized and decomposed into inorganic CO2And H2And O. After completion of one photocatalytic cracking cycle, the second electromagnetic valve 24 is opened to discharge the treated remaining gas to the rear stage. The catalyst 22 selected in the implementation is nano titanium dioxide and metal platinum in a specific proportion, and the catalytic effect of the nano titanium dioxide and the metal platinum is obviously improved under the irradiation of ultraviolet rays, so that the reaction rate of the photocatalytic cracking reaction can be improved, and the cycle of a single photocatalytic cracking cycle is further shortened.
After the photocatalytic cracking treatment is finished, the residual gas enters the water washing tank 3 to be sequentially subjected to acid washing and alkali washing, odor molecules contain odor molecules which are easily dissolved in acid liquor or alkali liquor, such as ammonia gas and hydrogen sulfide, and the gas can be removed in the water washing tank 3, and meanwhile, water-soluble gas can be removed after water washing.
Next, the remaining odor molecules will enter the adsorption bin 4, and the adsorption bin 4 of this embodiment uses three different adsorption fillers 42, which can adsorb water-soluble organic substances and front-end reaction products of odor gas of different types. The adsorption filler 42 adopted in the embodiment is immersed in the bicarbonate solution, and the solution can neutralize the PH value of the mixed gas on one hand, and can promote the dispersion effect of the gas in the adsorption bin 4 on the other hand, slow down the time of the odor molecules passing through the adsorption filler 42, and improve the removal rate of part of the gas. In addition, in this type of adsorption bin 4, the utilization rate of adsorption filler 42 is significantly improved, reducing the replacement cost of consumables.
The residual gas after adsorption treatment can enter the biological digestion bin 5, and the biological digestion bin 5 is mainly used for treating organic volatile odorous gas which cannot be subjected to harmless treatment by chemical treatment and physical adsorption at the front end. In the embodiment, the optimal biological digestion solution is prepared by combining the type of waste and the specific components of the substances generated in the composting process, and the optimal type of microorganisms in the biological flora is selected and bred. Thereby realizing the most efficient and sufficient gas harmless treatment effect. In order to maintain the stability of the gas treatment effect, the present embodiment further provides the aeration device 52 and the stirring device 51 for the bio-digestion chamber 5, which ensure that different microorganisms in the bio-digestion solution have the best biological activity in the whole treatment cycle, thereby exerting the best treatment effect.
The waste gas finally discharged from the biological digestion bin 5 is treated odorless gas. In order to prevent various microorganisms used in the bio-digestion solution from flowing out of the bio-digestion chamber 5 into the external environment along with the exhaust gas discharge process, causing damage to the environment. In this embodiment, particularly in the exhaust gas discharge process of the bio-digestion bin 5, even in the sterilization device 6, the finally discharged harmless exhaust gas is subjected to sterilization treatment.
In this embodiment, the sensor is used to monitor the treatment process at each stage in the treatment process, and then the controller 100 is used to control the operation states of the uv photolysis purifier 2 and the different devices in the bio-digestion tank. Human intervention in the running process of the system is reduced as much as possible, and the automation degree of the system is improved. The method not only improves the treatment efficiency of the system, but also improves the safety of managers, and the managers can not contact various toxic and harmful substances generated in the treatment process.
Example 2
This embodiment provides a biological treatment process for odor generated by chicken manure recycling, which is applied to the odor treatment system for organic waste recycling described in embodiment 1, and is used for treating odor generated in a chicken manure fermentation process, as shown in fig. 6, the biological treatment process includes the following steps:
(1) obtaining stink gas generated in the fermentation process of the chicken manure.
(2) And introducing the obtained odor gas into an ultraviolet photolysis purifier to complete a cycle process of photocatalytic cracking treatment.
In this embodiment, the ultraviolet photolysis catalyst employs nano-peltier particles and nano-titanium dioxide dispersed on a molecular sieve support as a catalyst, and ultraviolet rays are irradiated around the catalyst; the period of a single photocatalytic cracking cycle is 7-8 min. In the ultraviolet photolysis purifier, the mass fraction of nano platinum particles in the catalyst is not less than 0.1%; the power of the used ultraviolet lamp is not lower than 30W, and the irradiation intensity is more than 180 mu W/cm2。
(3) Introducing the gas subjected to the photocatalytic cracking treatment into a washing tank for washing, wherein the washing tank sequentially comprises an alkaline tank and an acidic tank according to the sequence of the treatment process; the pH value of the washing liquid in the alkaline pool is 8.5-9.0, and the pH value of the washing liquid in the acidic pool is 5.5-6.0. The water washing liquid in the acid tank is sulfuric acid solution, and the water washing liquid in the alkaline tank is sodium hydroxide solution.
The water washing tank can dissolve part of gas in the gas washing process and can also generate a series of acid-base neutralization reactions. Along with the continuation of odor treatment process, the liquid medicine can be consumed to the rinsing liquid in the rinsing pond, and the pH value of rinsing liquid can change. When the pH value of the washing liquid is detected to exceed a specified threshold value, managers should supplement the liquid medicine to the washing liquid in time to ensure the washing effect of the washing pool.
(4) Introducing the gas subjected to the water washing treatment into an adsorption bin for adsorption treatment; the adsorption filler in the adsorption bin sequentially comprises a zeolite section, a steel slag section and an ash slag section according to the sequence of the gas passing through; the filling material of the ash residue section is combustion ash residue of biomass fuel with porosity of more than 30%; the filler in the adsorption bin is immersed in the sodium bicarbonate solution.
The fillers in the adsorption bin are vertically arranged; gas enters along the lower opening of the adsorption bin and is discharged along the upper opening; in the adsorption filler in the adsorption bin, the particle size of the material of the zeolite section is 6-10mm, and the particle size of the material of the steel slag section is 5-7 mm; the particle size of the material of the ash residue section is 2-4 mm.
The zeolite, steel slag and ash slag are optimized inorganic fillers, which not only can exert good adsorption effect to treat odorous gas molecules in the implementation, but also realize the reutilization of waste gas resources because part of the materials belong to wastes generated in metallurgy and power generation industries. The method not only reduces the material cost in the odor treatment process, but also has high environmental protection benefit and ecological value.
(5) And introducing the gas subjected to adsorption treatment into a biological digestion tank containing a biological digestion solution for biological digestion treatment. The biological digestion solution comprises a microbial flora consisting of Enterobacter agglomerans, Lactobacillus acidophilus, Bacillus polymyxa and Acinetobacter, and nutrients required for supporting the life activities of the microbial flora.
In the biological digestion solution, the content ratio of the enterobacter agglomerans, the lactobacillus acidophilus, the bacillus polymyxa and the acinetobacter is (40-60): (3-5): (10-13): 1. wherein the combined concentration of the four types of microorganisms is at least 1.5x10 during the microbial digestion stage8cfu/ml. In the process of biological digestion treatment, the environmental temperature in the biological digestion bin is controlled to be 20-35 ℃, and the PH value of the biological digestion solution is controlled to be 6.0-6.5. In the process of biological digestion treatment, oxygen is periodically supplemented into the biological digestion solution through an aeration device, so that the dissolved oxygen in the biological digestion solution is not lower than 1.8 mg/L.
The core of treating harmful gases in the biological digestion solution is the selection of microbial flora. In this embodiment, specific microorganisms are selected and proportioned according to the types of harmful substances to be treated, so as to obtain a microbial flora with the best treatment effect. The temperature and the pH value environment are the control conditions for the microbial flora in the biological digestion solution to generate the treatment effect, and in the implementation, the environment state in the biological digestion bin is also accurately regulated and controlled in order to ensure the activity of the biological flora and the waste gas treatment effect.
(6) And (4) performing high-temperature sterilization treatment on the waste gas discharged from the biological digestion bin, and then discharging. Specifically, in this embodiment, the treatment temperature of the exhaust gas discharged from the biological digestion chamber in the high-temperature sterilization treatment stage is not lower than 140 ℃.
The above examples are merely illustrative of several embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (10)
1. An odor treatment system for resource utilization of organic waste, which is used for harmless treatment of odor gas generated in the organic waste composting treatment process, and is characterized by comprising:
the gas collecting mechanism is used for collecting odor gas to be treated and discharging the gas to the rear section; the gas collection mechanism comprises a gas collection port, a fan and an exhaust pipe;
the at least two ultraviolet photolysis purifiers are arranged at the rear section of the air collecting opening in parallel, and the gas collected by the gas collecting mechanism is discharged into a treatment cavity of the ultraviolet photolysis purifiers; the ultraviolet photolysis purifier is internally provided with a catalyst and an ultraviolet lamp; the catalyst is nano-platinum particles and nano-titanium dioxide which are dispersed on a molecular sieve carrier; the light of the ultraviolet lamp irradiates the surface of the catalyst; a first electromagnetic valve and a second electromagnetic valve are respectively arranged at an inlet and an outlet of a treatment cavity in the ultraviolet photolysis purifier; a gas flowmeter is further arranged at the inlet of the treatment cavity of each ultraviolet photolysis purifier;
the washing tank is arranged at the rear section of the ultraviolet photolysis purifier, comprises an alkaline tank and an acid tank and is used for sequentially carrying out alkaline washing and acid washing on gas flowing through the washing tank; a first check valve is arranged between the ultraviolet photolysis purifier and the alkaline pool, and the first check valve only allows fluid to enter the alkaline pool from the ultraviolet photolysis purifier; a second check valve is arranged between the alkaline tank and the acid tank, and the second check valve only allows fluid to enter the acid tank from the alkaline tank;
the adsorption bin is arranged at the rear section of the washing tank and is used for adsorbing the gas discharged from the washing tank; the adsorption bin comprises a shell and adsorption filler inside the shell; the shell is provided with an inlet and an outlet, the outlet is positioned at the top of the shell, the inlet is positioned at the bottom of the shell, and the inlet extends upwards to be flush with the height of the outlet through a pipeline; the adsorption filler is of a vertically arranged multilayer structure and sequentially comprises a zeolite section, a steel slag section and an ash slag section from bottom to top; the adsorption filler is immersed in a sodium bicarbonate solution;
the biological digestion bin is arranged at the rear section of the adsorption bin and is used for carrying out biological digestion treatment on residual gas discharged by the adsorption bin; the biological digestion bin contains biological digestion solution; the biological digestion solution comprises a microbial flora composed of Enterobacter agglomerans, Lactobacillus acidophilus, Bacillus polymyxa and Acinetobacter, and nutrient substances required for supporting the life activities of the microbial flora; the top of the biological digestion bin comprises a discharge port for discharging the treated tail gas; a temperature sensor and a dissolved oxygen sensor for monitoring the properties of the biological digestion solution are arranged in the biological digestion bin;
the sterilizing device is arranged at the discharge port of the biological digestion bin and is used for sterilizing the tail gas discharged from the discharge port; and
the controller is used for acquiring the detection result of the gas flowmeter, controlling the running states of the first electromagnetic valve, the second electromagnetic valve and the ultraviolet lamp according to the detection value of the gas flowmeter and completing a photocatalytic cracking cycle; the controller is also used for acquiring detection results of the temperature sensor and the dissolved oxygen sensor and sending out a corresponding alarm signal when the detection value exceeds a preset warning threshold value; the controller is also used for controlling the running state of the fan.
2. The odor treatment system for the resource utilization of organic waste according to claim 1, characterized in that: a backflow preventer is arranged between the water washing pool and the adsorption bin and between the adsorption bin and the biological digestion bin to prevent the solution in the adsorption bin and the biological digestion bin from entering the front-end equipment.
3. The odor treatment system for the resource utilization of organic waste according to claim 1, characterized in that: in the ultraviolet photolysis purifier, a control process of a complete photocatalytic cracking cycle is as follows:
in the initial state, only one of the ultraviolet photolysis purifiers is kept in a state of receiving the gas discharged from the front end; the controller closes the second electromagnetic valve of the ultraviolet photolysis purifier, obtains the detection result of the gas flowmeter, and closes the first electromagnetic valve of the ultraviolet photolysis purifier when the accumulated flow of the gas flowmeter in the current period reaches a specified threshold value, stops receiving gas, and opens the ultraviolet lamp to execute a processing period; after the treatment is finished, the controller opens the second electromagnetic valve to discharge the treated gas; meanwhile, when the current ultraviolet photolysis purifier is in a photocatalytic cracking treatment stage, the controller switches the rest ultraviolet photolysis purifiers to keep a receiving state.
4. The odor treatment system for the resource utilization of organic waste according to claim 1, characterized in that: the installation heights of the washing tank, the adsorption bin and the biological digestion bin are sequentially reduced.
5. The odor treatment system for the resource utilization of organic waste according to claim 1, characterized in that: the water washing liquid adopted in the alkaline pool is a sodium hydroxide solution with the pH value of 8.5-9.0; the water washing solution adopted in the acid tank is a sulfuric acid solution with the pH value of 5.5-6; the pH meter is used for regularly monitoring the pH value of the water washing liquid in the alkaline tank and the acid tank; the controller obtains the detection result of the PH meter and sends a corresponding alarm signal when the detection value exceeds a specified threshold value to remind a manager to supplement medicaments to the corresponding alkaline pool and the acid pool.
6. The odor treatment system for the resource utilization of organic waste according to claim 5, wherein: the PH meter is also used for regularly monitoring the pH value of the biological digestion solution, the controller obtains a corresponding detection result, and sends a corresponding alarm signal when the pH value of the biological digestion solution exceeds a specified threshold value, so as to remind a manager to adjust the PH value of the biological digestion solution to a preset safety interval.
7. The odor treatment system for the resource utilization of organic waste according to claim 1, characterized in that: in the adsorption filler, the particle size of the material of the zeolite section is 6-10mm, and the particle size of the material of the steel slag section is 5-7 mm; the particle size of the material of the ash residue section is 2-4 mm; the ash slag section is made of combustion ash slag of biomass fuel; the porosity of the ash is greater than 30%.
8. The odor treatment system for the resource utilization of organic waste according to claim 1, characterized in that: the biological digestion tank also comprises an aeration device which is used for oxygenating the biological digestion solution so as to keep the dissolved oxygen in the biological digestion solution not less than 1.8 mg/L; the controller is used for acquiring the detection result of the dissolved oxygen sensor, and controlling the aeration device to complete primary aeration when the detection value is lower than 1.8mg/L, so as to improve the dissolved oxygen in the biological digestion solution.
9. The odor treatment system for the resource utilization of organic waste according to claim 8, characterized in that: still be provided with agitating unit in the biological digestion pond, agitating unit is used for regularly right biological digestion solution stirs, agitating unit with the controller electricity is connected.
10. The odor treatment system for the resource utilization of organic waste according to claim 1, characterized in that: the sterilization device is a high-temperature sterilization box, the treatment temperature of the tail gas in the high-temperature sterilization box is higher than 140 ℃, and an auxiliary ultraviolet sterilization device is arranged at the rear end of the high-temperature sterilization box.
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| CN202110966942.5A CN113634103A (en) | 2021-08-23 | 2021-08-23 | Odor treatment system for resource utilization of organic wastes |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114917738A (en) * | 2022-06-10 | 2022-08-19 | 浙江深澜环境工程有限公司 | High-efficiency treatment method and system for VOCs waste gas with large air volume |
| CN115338706A (en) * | 2022-06-30 | 2022-11-15 | 山东玲珑轮胎股份有限公司 | Tire grinding device with exhaust-gas treatment system |
-
2021
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114917738A (en) * | 2022-06-10 | 2022-08-19 | 浙江深澜环境工程有限公司 | High-efficiency treatment method and system for VOCs waste gas with large air volume |
| CN115338706A (en) * | 2022-06-30 | 2022-11-15 | 山东玲珑轮胎股份有限公司 | Tire grinding device with exhaust-gas treatment system |
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