A kitchen garbage high-concentration odor combined treatment device and method

Abstract

The present application belongs to the technical field of environmental protection, and particularly relates to a high-concentration odor combined treatment device and method for kitchen waste. The odor pretreatment unit of the treatment device comprises an alkali washing tower and an acid washing tower, and the outlet of the alkali washing tower is connected to the inlet of the acid washing tower. The odor biological treatment unit is a combined biological filter tank, which comprises a biological trickling filter section, a pre-washing section and a biological filter section connected in series, and the inlet of the biological trickling filter section is connected to the outlet of the acid washing tower. The odor deep treatment unit comprises a double-mediator barrier low-temperature plasma equipment, a delay oxidation tower and a spraying tower connected in series, and the inlet of the double-mediator barrier low-temperature plasma equipment is connected to the outlet of the biological filter section. The double-mediator barrier low-temperature plasma equipment is used for removing residual refractory odor substances in the gas. The delay oxidation tower is used for prolonging the gas residence time, and the spraying tower is used for the final purification of the gas. The present application can efficiently and accurately remove odor-causing substances, and the treated gas can meet the environmental protection requirements.

Description

Technical Field

[0001] This invention belongs to the field of environmental protection technology, specifically relating to a device and method for the combined treatment of high-concentration odor from kitchen waste. Background Technology

[0002] Kitchen waste mainly consists of easily perishable organic waste such as fruit and vegetable scraps, leftovers, and fruit peels discarded in daily household life. The amount generated is relatively small and dispersed. During the collection, transportation, treatment, and disposal of kitchen waste, a large amount of malodorous gases are produced. These malodorous substances have complex compositions, mainly including sulfur-containing compounds (such as hydrogen sulfide and methanethiol), nitrogen-containing compounds (such as ammonia, trimethylamine, indole, and skatole), fatty acids (such as butyric acid and hexanoic acid), and other organic matter (such as acetaldehyde and acetone). These malodorous gases not only cause serious pollution to the surrounding atmospheric environment but also harm the human respiratory, digestive, and nervous systems, causing strong public dissatisfaction and becoming one of the key bottlenecks restricting the development of the kitchen waste treatment industry.

[0003] Currently, existing technologies for treating odors from kitchen waste mainly include single or simple combinations of processes such as physical adsorption, chemical washing, biological treatment, and plasma treatment. However, these technologies generally suffer from low treatment efficiency, narrow applicability, high operating costs, and the potential for secondary pollution. For example, single chemical washing methods are insufficient to simultaneously and efficiently remove acidic, alkaline, and neutral odorous substances; traditional biological treatment methods are ineffective at treating high concentrations of recalcitrant odor components and are significantly affected by environmental factors; single plasma treatment methods are energy-intensive and may generate secondary pollutants such as ozone. Therefore, developing an integrated technology that can efficiently, stably, and cost-effectively treat the high concentrations and multi-component odorous gases from kitchen waste is of significant practical importance and application value. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a combined treatment device and method for high-concentration odor from kitchen waste. This invention utilizes a combined process of "odor pretreatment + biological treatment + advanced treatment" to achieve efficient, step-by-step removal of multiple malodorous substances from kitchen waste, ensuring that the treated gas meets emission standards, while simultaneously reducing operating costs and minimizing secondary pollution.

[0005] To achieve the above technical objectives, the technical solution adopted in the embodiments of the present invention is as follows: In a first aspect, embodiments of the present invention provide a combined treatment device for high-concentration odor from kitchen waste, comprising an odor pretreatment unit, an odor biological treatment unit, and an odor deep treatment unit; The odor pretreatment unit is used to pretreat odors and includes an alkaline scrubbing tower and an acid scrubbing tower, with the outlet of the alkaline scrubbing tower connected to the inlet of the acid scrubbing tower. The odor biological treatment unit is a combined biofilter used for biological treatment of odor, including a biotrickling filter section, a pre-washing section and a biofiltration section connected in series. The inlet of the biotrickling filter section is connected to the outlet of the acid washing tower. The odor deep treatment unit is used to perform deep treatment of odor, including a dual-media barrier low-temperature plasma device, a delayed oxidation tower and a spray tower connected in series. The inlet of the dual-media barrier low-temperature plasma device is connected to the outlet of the biofiltration section. The dual-medium barrier low-temperature plasma device can generate active substances, which can undergo oxidation, cracking and bond breaking reactions with residual recalcitrant malodorous substances in the gas. The delayed oxidation tower is equipped with a baffle plate to extend the gas residence time, and the spray tower is used for the final purification of the gas.

[0006] Furthermore, the alkaline scrubbing tower is filled with a first corrosion-resistant inert carrier packing material, and the alkaline scrubbing tower is used to remove acidic malodorous substances, grease, water vapor and dust from the odorous gas; The interior of the pickling tower is filled with a second corrosion-resistant inert carrier packing, and the pickling tower is used to remove alkaline malodorous substances and metal ions from the odorous gas; The interior of the bio-trickling filter section is filled with a first inert carrier packing material. The bio-trickling filter section uses the residual malodorous substances in the odor as carbon and nitrogen sources to degrade them into harmless substances. The pre-wash section is filled with a second inert carrier packing material to remove microbial metabolites and a small amount of undegraded pollutants entrained in the gas. The interior of the biofiltration section is filled with composite filler material to enhance the degradation of residual malodorous substances; The interior of the spray tower is filled with a third inert carrier packing material for the final purification of the gas.

[0007] Furthermore, the top of the alkaline washing tower, acid washing tower, biological trickling filter section, pre-washing section, biological filtration section, and spray tower are all equipped with spray devices, and the spray devices are connected to the storage tank through a circulating spray pump. The bottom of the alkaline washing tower, acid washing tower, biological trickling filter section, pre-washing section, biological filtration section, and spray tower is equipped with a liquid collection tank, which is connected to the wastewater collection pool and the storage tank.

[0008] Secondly, embodiments of the present invention provide a method for the combined treatment of high-concentration odor from kitchen waste, comprising the following steps: Step S1, Odor Pretreatment: Step S1.1, Alkaline Washing Treatment: The kitchen waste odor collected by the negative pressure of the induced draft fan first enters the alkaline washing tower. The first circulating spray pump delivers the alkaline agent stored in the alkaline solution storage tank to the first spray device, forming a uniform spray liquid film. The liquid film is sprayed onto the first corrosion-resistant inert carrier packing and comes into full contact with the odor. The alkaline agent reacts with the acidic odorous substances, grease, water vapor and dust in the odor, achieving the initial removal of odorous substances. Step S1.2, Acid Washing Treatment: The odorous gas after alkaline washing enters the acid washing tower. The second circulating spray pump delivers the acidic agent stored in the acid storage tank to the second spray device, forming a uniform spray liquid film. The liquid film is sprayed onto the second corrosion-resistant inert carrier packing and comes into full contact with the odorous gas. The acidic agent reacts with the alkaline odorous substances and metal ions in the odorous gas to further remove the odorous substances. Step S2, Odor Biochemical Treatment: Step S2.1, Bio-trickling filtration treatment: The odorous gas after acid washing enters the bio-trickling filtration section. The third circulating spray pump transports the microbial nutrient solution stored in the nutrient solution storage tank to the third spray device, forming a uniformly sprayed liquid film, which is sprayed onto the surface of the first inert carrier packing. The highly efficient degrading bacteria attached to the first inert carrier packing use the residual malodorous substances in the odorous gas as carbon and nitrogen sources to degrade them into harmless substances including carbon dioxide, water, sulfate and nitrate. Step S2.2, Biological pre-washing treatment: The odorous gas from the biological trickling filter section enters the pre-washing section. The fourth circulating spray pump delivers the clean water stored in the first water storage tank to the fourth spray device, forming a uniformly sprayed liquid film, which is sprayed onto the surface of the second inert carrier packing to remove microbial metabolites and a small amount of undegraded pollutants entrained in the gas, while adjusting the gas humidity to ≥95%. Step S2.3, biological filtration treatment: The pre-washed odorous gas enters the biological filtration section. The fifth circulating spray pump intermittently delivers the clean water stored in the second water storage tank to the fifth spray device to form a uniformly sprayed liquid film, which is sprayed onto the surface of the composite packing to further enhance the degradation of residual odorous substances and ensure that most of the organic odorous substances in the gas are removed. Step S3, Deep Odor Treatment: Step S3.1, Dual-dielectric barrier low-temperature plasma treatment: The gas after biological filtration enters the dual-dielectric barrier low-temperature plasma equipment. Under the action of a high-frequency alternating electric field of 10-20kV and 10-30kHz, the waste gas is excited in the dual-dielectric barrier discharge area to form a uniform and stable low-temperature plasma. The generated strong oxidizing active substances and the recalcitrant odor substances undergo oxidation, cracking and bond breaking reactions, destroying the molecular structure of pollutants and ultimately degrading them into non-toxic and harmless products. Step S3.2, Delayed oxidation treatment: The odorous gas that has been treated by low-temperature plasma with dual-medium barrier enters the delayed oxidation tower. Under the action of the guide plate, the gas residence time is extended, so that the unreacted strong oxidizing active substances and residual pollutants can fully react. Step S3.3, Spraying treatment: The odorous gas after delayed oxidation treatment enters the spray tower. The sixth circulating spray pump delivers the oxidant or clean water in the reagent storage tank to the sixth spray device to form a uniform spray liquid film, which is sprayed onto the third inert carrier packing to perform final purification of the gas, removing residual trace pollutants and secondary pollutants such as ozone that may be generated during the plasma treatment. The treated gas enters the exhaust stack through the induced draft fan.

[0009] Further, in step S1, the acidic malodorous substances include: hydrogen sulfide, methanethiol, and fatty acid organic compounds, wherein the fatty acid organic compounds include butyric acid and hexanoic acid; The alkaline malodorous substances include ammonia and trimethylamine.

[0010] Furthermore, in step S2, the substances removed by the bio-trickling filter section include sulfides and complex VOCs; The substances removed in the pre-washing section include soluble gases and particulate matter; The biofiltration section removes substances including biodegradable organic matter.

[0011] Furthermore, in step S3, the highly oxidizing active substance includes: high-energy electrons, hydroxyl radicals OH·, and superoxide anion radicals O2. - And ozone; The recalcitrant odorous substances include indole, skatole, acetaldehyde, and acetone.

[0012] Furthermore, in step S1, the contact time between the odorous gas and the first corrosion-resistant inert carrier packing in the alkaline washing tower is ≥2s; The contact time between the odor and the second corrosion-resistant inert carrier packing in the pickling tower is ≥2s.

[0013] Furthermore, in step S2, the empty tower flow velocity of the combined biological filter is ≤300m. 3 / (m 2 •h), the residence time of odor in the bio-trickling filter section is ≥13s, the residence time in the pre-wash section is ≥5s, and the residence time in the bio-filtration section is ≥20s.

[0014] Furthermore, in step S3, the residence time of the odorous gas in the dual-medium barrier low-temperature plasma device is ≥0.4s, the residence time in the delayed oxidation tower is ≥1.0s, and the contact time with the third inert carrier packing in the spray tower is ≥2s.

[0015] Compared with the prior art, the beneficial effects of the technical solution provided by the embodiments of the present invention are as follows: This invention achieves highly efficient purification of high-concentration, complex odors from kitchen waste through systematic improvements such as graded pollution control, humidification and temperature stabilization, biological degradation, deep plasma pyrolysis, and delayed oxidation. The system has strong impact resistance, stable operation, low energy consumption, and no secondary pollution, ensuring stable odor emissions that meet standards and completely eliminating the problem of odor nuisance. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the combined treatment device for high-concentration odor from kitchen waste according to the present invention.

[0017] Explanation of reference numerals in the attached drawings: 1-Alkali washing tower; 2-Acid washing tower; 3-Bio-trickling filter section; 4-Pre-wash section; 5-Bio-filtration section; 6-Dual-media barrier low-temperature plasma equipment; 7-Delayed oxidation tower; 8-Spray tower; 101-First corrosion-resistant inert carrier packing; 201-Second corrosion-resistant inert carrier packing; 301-First inert carrier packing; 401-Second inert carrier packing; 501-Composite packing; 701-Baffle plate; 801-Third inert carrier packing; 9A - First spray device; 10A - First circulating spray pump; 11A - Alkali storage tank; 12A - First collection tank; 9B - Second spray device; 10B - Second circulating spray pump; 11B - Acid storage tank; 12B - Second collection tank; 9C - Third spray device; 10C - Third circulating spray pump; 11C - Nutrient solution storage tank; 12C - Third collection tank; 9D - Fourth spray device; 10D - Fourth circulating spray pump; 11D - First water storage tank; 12D - Fourth collection tank; 9E - Fifth spray device; 10E - Fifth circulating spray pump; 11E - Second water storage tank; 12E - Fifth collection tank; 9F - Sixth spray device; 10F - Sixth circulating spray pump; 11F - Chemical storage tank; 12F - Sixth collection tank. Detailed Implementation

[0018] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "inner" and "outer", "upper" and "lower", "left" and "right" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention.

[0019] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0020] Example 1 like Figure 1 As shown, a combined treatment device for high-concentration odor from kitchen waste includes an odor pretreatment unit, an odor biological treatment unit, and an odor deep treatment unit.

[0021] The aforementioned combined treatment unit for high-concentration odor from kitchen waste is applied in a food waste treatment plant. The designed capacity for kitchen waste treatment is 725 t / d, and the capacity for high-concentration odor treatment is 190,000 m³. 3 The main components and concentrations of the malodorous gases are as follows: NH3 4.96 mg / m3, H2S 0.97 mg / m3. 3 The odor concentration was 4000.

[0022] The odor pretreatment unit includes an alkaline scrubbing tower 1 and an acid scrubbing tower 2. The outlet of the alkaline scrubbing tower 1 is connected to the inlet of the acid scrubbing tower 2. The alkaline scrubbing tower 1 is used to remove acidic odorous substances, grease, water vapor and dust from the odorous gas, while the acid scrubbing tower 2 is used to remove alkaline odorous substances and metal ions from the odorous gas.

[0023] In one implementation, the odor pretreatment unit includes two alkaline scrubbing towers 1 and two acid scrubbing towers 2, each with dimensions of φ5.0m × 8.0m (height).

[0024] The odor biological treatment unit is a combined biological filter, with an empty tower flow velocity ≤300m / s. 3 / (m 2 ·h), including a biological trickling filter section 3, a pre-washing section 4 and a biological filtration section 5 connected in series, with the inlet of the biological trickling filter section 3 connected to the outlet of the acid washing tower 2.

[0025] In one implementation, the number of bio-trickling filter section 3, pre-wash section 4, and bio-filtration section 5 are all 2. The dimensions of bio-trickling filter section 3 are 12.0m (length) × 12.0m (width) × 5.5m (height), the dimensions of pre-wash section 4 are 5.0m (length) × 12.0m (width) × 5.5m (height), and the dimensions of bio-filtration section 5 are 19.0m (length) × 12.0m (width) × 5.5m (height).

[0026] The odor deep treatment unit includes a dual-media barrier low-temperature plasma device 6, a delayed oxidation tower 7, and a spray tower 8 connected in series. The inlet of the dual-media barrier low-temperature plasma device 6 is connected to the outlet of the biofiltration section 5.

[0027] In one implementation method, four sets of dual-medium barrier low-temperature plasma equipment 6 are installed, each with dimensions of 7.06m (length) × 2.65m (width) × 2.00m (height). Four delayed oxidation towers 7 are installed, each with dimensions of 6.0m (length) × 2.85m (width) × 2.6m (height), and an effective volume of 37.05m³. Four spray towers 8 are installed, each with dimensions of φ3.0m × 8.7m (height), filled with multi-faceted hollow PP spheres at a height of 3.8m.

[0028] The dual-dielectric barrier low-temperature plasma device 6 uses special high-purity quartz as the dual-dielectric barrier electrode and is equipped with a high-voltage source. Under the action of 10-20kV high voltage and 10-30kHz high-frequency alternating electric field, it can generate active substances. The active substances can react with the residual odorous substances in the gas through oxidation, cracking and bond breaking reactions. The delayed oxidation tower 7 is equipped with a guide plate 701 to extend the gas residence time. The guide plate 701 is set on the inner wall of the delayed oxidation tower 7, so that the gas flows in an S-shape in the delayed oxidation tower 7, thereby extending the gas residence time; the spray tower 8 is used for the final purification of the gas.

[0029] The alkaline washing tower 1 is filled with a first corrosion-resistant inert carrier packing 101, and the acid washing tower 2 is filled with a second corrosion-resistant inert carrier packing 201.

[0030] In one embodiment, both the first corrosion-resistant inert carrier packing 101 and the second corrosion-resistant inert carrier packing 201 are PP Pall rings, and the packing height is 2.7m; The interior of the bio-trickling filter section 3 is filled with a first inert carrier packing 301. The bio-trickling filter section 3 uses the residual malodorous substances in the odor as carbon and nitrogen sources to degrade them into harmless substances. The pre-wash section 4 is filled with a second inert carrier packing 401 to remove microbial metabolites and a small amount of undegraded pollutants carried in the gas.

[0031] In one implementation, the first inert carrier packing 301 uses PP Pall rings, and the second inert carrier packing 401 uses PP multifaceted hollow spheres, with a packing height of 2.7m for both.

[0032] The interior of the biological filtration section 5 is filled with composite filler 501 to enhance the degradation of residual malodorous substances. As one embodiment, the composite filler 501 is a volcanic rock + bamboo charcoal composite filler with a height of 2.7m.

[0033] The interior of the spray tower 8 is filled with a third inert carrier packing 801 for the final purification of the gas.

[0034] In one implementation method, the third inert carrier packing 801 is made of PP material with multifaceted hollow spheres and a packing height of 3.8m.

[0035] Each alkaline washing tower 1 is equipped with a first spray device 9A at its top. The first spray device 9A is connected to an alkaline solution storage tank 11A via a first circulating spray pump 10A. The alkaline solution storage tank 11A stores a 5% sodium hydroxide solution by mass. The flow rate of the first circulating spray pump 10A is 200 m³ / s. 3 / h; Each pickling tower 2 is equipped with a second spray device 9B at its top. The second spray device 9B is connected to an acid storage tank 11B via a second circulating spray pump 10B. The acid storage tank 11B stores a 3% sulfuric acid solution. The flow rate of the second circulating spray pump 10B is 200 m³ / s. 3 / h; Each of the biological trickling filter sections 3 is equipped with a third spray device 9C at its top. The third spray device 9C is connected to the nutrient solution storage tank 11C via a third circulating spray pump 10C. The flow rate of the third circulating spray pump 10C is 140 m³ / s. 3 / h, the nutrient solution is a biological strain, and the biological strain adopts highly efficient degrading bacteria (such as sulfur oxidizing bacteria, ammonia oxidizing bacteria, heterotrophic bacteria, etc.). Each pre-wash section 4 is equipped with a fourth spray device 9D at its top. The fourth spray device 9D is connected to the first water storage tank 11D via a fourth circulating spray pump 10D. The flow rate of the fourth circulating spray pump 10D is 140 m³ / s. 3 / h; Each biological filtration section 5 is equipped with a fifth spray device 9E at its top. The fifth spray device 9E is connected to the second water storage tank 11E via a fifth circulating spray pump 10E. The fifth circulating spray pump 10E intermittently supplies water to the fifth spray device 9E, and its flow rate is 70 m³ / s. 3 / h; Each spray tower 8 is equipped with a sixth spray device 9F at its top. The sixth spray device 9F is connected to the reagent storage tank 11F via a sixth circulating spray pump 10F. The flow rate of the sixth circulating spray pump 10F is 60 m³ / s. 3 / h, the reagent storage tank 11F contains oxidizing agents (such as sodium hypochlorite solution) or water.

[0036] The bottom of alkaline washing tower 1, acid washing tower 2, biological trickling filter section 3, pre-washing section 4, biological filtration section 5 and spray tower 8 are all equipped with liquid collection tanks, which are connected to wastewater collection pools and storage tanks.

[0037] Specifically, the bottom of the alkali washing tower 1 is provided with a first liquid collection tank 12A, which is connected to the wastewater collection pool and the alkali storage tank 11A. The bottom of the pickling tower 2 is equipped with a second liquid collection tank 12B, which is connected to the wastewater collection tank and the acid storage tank 11B. The bottom of the biological trickling filter section 3 is equipped with a third collection tank 12C, which is connected to the wastewater collection tank and the nutrient solution storage tank 11C. The bottom of the pre-washing section 43 is provided with a fourth liquid collection tank 12D, which is connected to the wastewater collection tank and the first water storage tank 11D. The bottom of the biological filtration section 5 is equipped with a fifth collection tank 12E, which is connected to the wastewater collection tank and the second water storage tank 11E. The bottom of the spray tower 8 is equipped with a sixth liquid collection tank 12F, which is connected to the wastewater collection pool and the reagent storage tank 11F.

[0038] Example 2 A method for combined treatment of high-concentration odor from kitchen waste includes the following steps: Step S1, Odor Pretreatment: Step S1.1, Alkaline washing treatment: The kitchen waste odor collected under negative pressure first enters the alkaline washing tower 1. The first circulating spray pump 10A transports the alkaline agent in the alkaline storage tank 11A to the first spray device 9A, forming a uniform spray liquid film. The liquid film is sprayed onto the surface of the first corrosion-resistant inert carrier packing 101 and comes into full contact with the odor. The alkaline agent reacts with the acidic odorous substances, grease, water vapor, dust and other substances in the odor, achieving the initial removal of odorous substances. Acidic malodorous substances include hydrogen sulfide, methanethiol, and fatty acid organic compounds, among which fatty acid organic compounds include butyric acid and hexanoic acid.

[0039] In one implementation, the gas flow rate is 1.34 m / s, and the contact time between the odor gas and the first corrosion-resistant inert carrier packing 101 is 2.01 s; Step S1.2, Acid washing treatment: The odorous gas after alkaline washing enters the acid washing tower 2. The second circulating spray pump 10B transports the acidic agent from the acid storage tank 11B to the second spray device 9B, forming a uniform spray liquid film. The liquid film is sprayed onto the surface of the second corrosion-resistant inert carrier packing 201 and comes into full contact with the odorous gas. The acidic agent reacts with the alkaline odorous substances and metal ions in the gas, further removing the odorous substances. In one implementation, the gas flow rate is 1.34 m / s, and the contact time between the odor gas and the second corrosion-resistant inert carrier packing 201 is 2.01 s; Alkaline malodorous substances include ammonia and trimethylamine.

[0040] Step S2, Odor Biochemical Treatment: Step S2.1, Biotrickling Filtration Treatment: The odorous gas after acid washing enters the biotrickling filtration section 3. The third circulating spray pump 10C transports the microbial nutrient solution in the nutrient solution storage tank 11C to the third spray device 9C, forming a uniform sprayed liquid film that is sprayed onto the surface of the first inert carrier packing 301. The highly efficient degrading bacteria (such as sulfur oxidizing bacteria, ammonia oxidizing bacteria, heterotrophic bacteria, etc.) attached to the first inert carrier packing 301 use the residual malodorous substances in the odorous gas as carbon and nitrogen sources to degrade them into harmless carbon dioxide, water, sulfate, nitrate and other substances. In one implementation method, the effective contact time between the odor and the first inert carrier packing 301 is 14.73 s; The substances removed by the bio-trickling filter stage 3 include sulfides and complex VOCs.

[0041] Step S2.2, Biological Pre-washing Treatment: Odorous gas from the biological trickling filter section 3 enters the pre-washing section 4. The fourth circulating spray pump 10D transports clean water from the first water storage tank 11D to the fourth spray device 9D, forming a uniformly sprayed liquid film onto the surface of the second inert carrier packing 401, removing microbial metabolites and a small amount of undegraded pollutants entrained in the gas, while simultaneously adjusting the gas humidity to 98%-100%. In one implementation method, the effective contact time between the odor and the second inert carrier packing 401 is 6.14 s; The substances removed in the pre-washing section 4 include soluble gases and particulate matter.

[0042] Step S2.3, biological filtration treatment: The pre-washed odorous gas enters the biological filtration section 5. The fifth circulating spray pump 10E transports the clean water in the second water storage tank 11E to the fifth spray device 9E, forming a uniform spray liquid film sprayed onto the surface of the composite packing 501, further enhancing the degradation of residual odorous substances and ensuring that most of the organic odorous substances in the gas are removed. In one implementation method, the effective contact time between the odor and the composite packing material 501 in the biofiltration section 5 is 23.33 s; The biofiltration stage 5 removes substances including biodegradable organic matter.

[0043] Step S3, Deep Odor Treatment: Step S3.1, Dual-dielectric barrier low-temperature plasma treatment: The gas after biological filtration enters the dual-dielectric barrier low-temperature plasma equipment 6. Under the action of a 13kV, 10kHz high-frequency alternating electric field, the waste gas is excited in the dual-dielectric barrier discharge area to form a uniform and stable low-temperature plasma. The generated strong oxidizing active substances and the difficult-to-degrade malodorous substances undergo oxidation, cracking and bond breaking reactions, destroying the molecular structure of pollutants and finally degrading them into non-toxic and harmless products such as carbon dioxide, water and inorganic salts. In one implementation method, the residence time of the gas in the dual-medium barrier cryogenic plasma device 6 is 0.5 s; Strongly oxidizing reactive substances include: high-energy electrons, hydroxyl radicals (OH·), and superoxide anion radicals (O2). - And ozone, etc.; Recalcitrant odorous substances include indole, skatole, acetaldehyde, and acetone.

[0044] Step S3.2, Delayed oxidation treatment: The odorous gas that has been treated by low-temperature plasma with dual-medium barrier enters the delayed oxidation tower 7. Under the action of the guide plate 701, the gas residence time is extended, so that the unreacted strong oxidizing active substances and residual pollutants can fully react. In one implementation method, the effective residence time of the gas in the delayed oxidation tower 7 is 2.80 s; Step S3.3, Spraying treatment: The odorous gas after delayed oxidation treatment enters the spray tower 8. The sixth circulating spray pump 10F transports the oxidant or clean water in the reagent storage tank 11F to the sixth spray device 9F, forming a uniform spray liquid film that is sprayed onto the surface of the third inert carrier packing 801 to perform final purification of the gas, removing residual trace pollutants and secondary pollutants such as ozone that may be generated during the plasma treatment process. The treated gas enters the exhaust stack through the induced draft fan.

[0045] In one implementation, the gas flow rate is 1.87 m / s, and the contact time between the odor gas and the third inert carrier packing 801 is 2.03 s; Treatment effect: After treatment by the device and method of this invention, the concentration of each odorous substance in the exhaust gas from the 25m exhaust stack is: NH3 ≤ 1.0mg / m³ 3 Odor concentration ≤200, no H2S detected, far below national and local emission standards, making it particularly suitable for projects with strict odor emission standards and those located close to residential areas.

[0046] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A combined treatment device for high-concentration odor from kitchen waste, characterized in that, It includes an odor pretreatment unit, an odor biological treatment unit, and an odor deep treatment unit; The odor pretreatment unit is used to pretreat odors and includes an alkaline scrubbing tower (1) and an acid scrubbing tower (2), with the outlet of the alkaline scrubbing tower (1) connected to the inlet of the acid scrubbing tower (2). The odor biological treatment unit is a combined biological filter for biological treatment of odor, including a biological trickling filter section (3), a pre-washing section (4) and a biological filtration section (5) connected in series. The inlet of the biological trickling filter section (3) is connected to the outlet of the acid washing tower (2). The odor deep treatment unit is used to perform deep treatment of odor, including a dual-medium barrier low-temperature plasma device (6), a delayed oxidation tower (7) and a spray tower (8) connected in series. The inlet of the dual-medium barrier low-temperature plasma device (6) is connected to the outlet of the biofiltration section (5). The dual-medium barrier low-temperature plasma device (6) can generate active substances, which can undergo oxidation, cracking and bond breaking reactions with the residual odorous substances in the gas. The delayed oxidation tower (7) is equipped with a guide plate (701) for extending the gas residence time, and the spray tower (8) is used for final purification of the gas.

2. The combined treatment device for high-concentration odor from kitchen waste according to claim 1, characterized in that, The alkaline scrubbing tower (1) is filled with a first corrosion-resistant inert carrier packing (101). The alkaline scrubbing tower (1) is used to remove acidic malodorous substances, grease, water vapor and dust from the odorous gas. The interior of the pickling tower (2) is filled with a second corrosion-resistant inert carrier packing (201), and the pickling tower (2) is used to remove alkaline malodorous substances and metal ions from the odorous gas; The interior of the bio-trickling filter section (3) is filled with a first inert carrier packing material (301). The bio-trickling filter section (3) uses the residual malodorous substances in the odor as carbon and nitrogen sources to degrade them into harmless substances. The prewash section (4) is filled with a second inert carrier packing (401) to remove microbial metabolites and a small amount of undegraded pollutants carried in the gas. The interior of the biofiltration section (5) is filled with composite filler (501) to enhance the degradation of residual malodorous substances; The interior of the spray tower (8) is filled with a third inert carrier packing (801) for the final purification of the gas.

3. The combined treatment device for high-concentration odor from kitchen waste according to claim 1, characterized in that, The top of the alkaline washing tower (1), acid washing tower (2), biological trickling filter section (3), pre-washing section (4), biological filtration section (5) and spray tower (8) are all equipped with spray devices, and the spray devices are connected to the storage tank through a circulating spray pump. The bottom of the alkaline washing tower (1), acid washing tower (2), biological trickling filter section (3), pre-washing section (4), biological filtration section (5) and spray tower (8) are all equipped with liquid collection tanks, which are connected to the wastewater collection pool and the storage tank.

4. A method for combined treatment of high-concentration odor from kitchen waste, characterized in that, Includes the following steps: Step S1, Odor Pretreatment: Step S1.1, Alkaline washing treatment: The kitchen waste odor collected by the negative pressure of the induced draft fan first enters the alkaline washing tower (1). The first circulating spray pump (10A) transports the alkaline agent stored in the alkaline storage tank (11A) to the first spray device (9A) to form a uniform spray liquid film, which is sprayed onto the first corrosion-resistant inert carrier packing (101) to fully contact the odor. The alkaline agent reacts with the acidic odorous substances, oils, water vapor and dust in the odor to achieve the initial removal of odorous substances. Step S1.2, pickling treatment: The odorous gas after alkaline washing enters the pickling tower (2). The second circulating spray pump (10B) transports the acidic agent stored in the acid storage tank (11B) to the second spray device (9B) to form a uniform spray liquid film. The liquid film is sprayed onto the second corrosion-resistant inert carrier packing (201) and comes into full contact with the odorous gas. The acidic agent reacts with the alkaline odorous substances and metal ions in the odorous gas to further remove the odorous substances. Step S2, Odor Biochemical Treatment: Step S2.1, Bio-trickling filtration treatment: The odorous gas after acid washing enters the bio-trickling filtration section (3). The third circulating spray pump (10C) transports the microbial nutrient solution stored in the nutrient solution storage tank (11C) to the third spray device (9C) to form a uniform spray liquid film, which is sprayed onto the surface of the first inert carrier packing (301). The highly efficient degrading bacteria attached to the first inert carrier packing (301) use the residual malodorous substances in the odorous gas as carbon and nitrogen sources to degrade them into harmless substances including carbon dioxide, water, sulfate and nitrate. Step S2.2, biological pre-washing treatment: The odorous gas from the biological trickling filter section (3) enters the pre-washing section (4). The fourth circulating spray pump (10D) transports the clean water stored in the first water storage tank (11D) to the fourth spray device (9D) to form a uniform spray liquid film, which is sprayed onto the surface of the second inert carrier packing (401) to remove microbial metabolites and a small amount of undegraded pollutants entrained in the gas, while adjusting the gas humidity to ≥95%. Step S2.3, biological filtration treatment: The pre-washed odorous gas enters the biological filtration section (5). The fifth circulating spray pump (10E) intermittently transports the clean water stored in the second water storage tank (11E) to the fifth spray device (9E) to form a uniformly sprayed liquid film, which is sprayed onto the surface of the composite packing (501) to further enhance the degradation of residual odorous substances and ensure that most of the organic odorous substances in the gas are removed. Step S3, Deep Odor Treatment: Step S3.1, Dual-dielectric barrier low-temperature plasma treatment: The gas after biological filtration enters the dual-dielectric barrier low-temperature plasma equipment (6). Under the action of a high-frequency alternating electric field of 10-20kV and 10-30kHz, the waste gas is excited in the dual-dielectric barrier discharge area to form a uniform and stable low-temperature plasma. The generated strong oxidizing active substances and the difficult-to-degrade malodorous substances undergo oxidation, cracking and bond breaking reactions, destroying the molecular structure of pollutants and finally degrading them into non-toxic and harmless products. Step S3.2, Delayed oxidation treatment: The odorous gas that has been treated by low-temperature plasma with dual-medium barrier enters the delayed oxidation tower (7). Under the action of the guide plate (701), the gas residence time is extended, so that the unreacted strong oxidizing active substances and residual pollutants can fully react. Step S3.3, Spraying treatment: The odorous gas after delayed oxidation treatment enters the spray tower (8). The sixth circulating spray pump (10F) transports the oxidant or clean water in the reagent storage tank (11F) to the sixth spray device (9F) to form a uniform spray liquid film, which is sprayed onto the third inert carrier packing (801) to finally purify the gas, remove residual trace pollutants and secondary pollutants such as ozone that may be generated during the plasma treatment. The treated gas enters the exhaust stack through the induced draft fan.

5. The method for combined treatment of high-concentration odor from kitchen waste according to claim 4, characterized in that, In step S1, the acidic malodorous substances include: hydrogen sulfide, methanethiol and fatty acid organic compounds, wherein the fatty acid organic compounds include butyric acid and hexanoic acid; The alkaline malodorous substances include ammonia and trimethylamine.

6. The method for combined treatment of high-concentration odor from kitchen waste according to claim 4, characterized in that, In step S2, the substances removed by the bio-trickling filter section (3) include: sulfides and complex VOCs; The substances removed in the prewashing section (4) include soluble gases and particulate matter; The biofiltration section (5) removes substances including biodegradable organic matter.

7. The method for combined treatment of high-concentration odor from kitchen waste according to claim 4, characterized in that, In step S3, the highly oxidizing active substance includes: high-energy electrons, hydroxyl radicals OH·, and superoxide anion radicals O2. - And ozone; The recalcitrant odorous substances include indole, skatole, acetaldehyde, and acetone.

8. The method for combined treatment of high-concentration odor from kitchen waste according to claim 4, characterized in that, In step S1, the contact time between the odor and the first corrosion-resistant inert carrier packing (101) in the alkaline washing tower (1) is ≥2s; The contact time between the odor and the second corrosion-resistant inert carrier packing (201) in the pickling tower (2) is ≥2s.

9. The method for combined treatment of high-concentration odor from kitchen waste according to claim 4, characterized in that, In step S2, the empty tower velocity of the combined biological filter is ≤300m. 3 / (m 2 •h), the residence time of odor in the bio-trickling filter section (3) is ≥13s, the residence time in the pre-wash section (4) is ≥5s, and the residence time in the bio-filtration section (5) is ≥20s.

10. The method for combined treatment of high-concentration odor from kitchen waste according to claim 4, characterized in that, In step S3, the residence time of the odor in the dual-medium barrier low-temperature plasma device (6) is ≥0.4s, the residence time in the delayed oxidation tower (7) is ≥1.0s, and the contact time with the third inert carrier packing (801) in the spray tower (8) is ≥2s.

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