CN112044255A - System and method for treating animal carcass harmless cooking waste gas - Google Patents

System and method for treating animal carcass harmless cooking waste gas Download PDF

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Publication number
CN112044255A
CN112044255A CN202011041507.3A CN202011041507A CN112044255A CN 112044255 A CN112044255 A CN 112044255A CN 202011041507 A CN202011041507 A CN 202011041507A CN 112044255 A CN112044255 A CN 112044255A
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biological
tower
waste gas
filter layer
alkaline washing
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CN112044255B (en
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郑理慎
蔡聆聆
陈志平
宋旭
祝雅杰
熊忐利
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Guangdong Zhongzhou Environmental Protection Industry Co ltd
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Guangdong Zhongzhou Environmental Protection Industry Co ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • 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
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/77—Liquid phase processes
    • B01D53/78—Liquid phase processes with gas-liquid contact
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • 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
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/38—Removing components of undefined structure
    • B01D53/44—Organic components
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • 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
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/48—Sulfur compounds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • 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
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/48—Sulfur compounds
    • B01D53/52—Hydrogen sulfide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • 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
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/54—Nitrogen compounds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • 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
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/54—Nitrogen compounds
    • B01D53/58—Ammonia
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • 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
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/84—Biological processes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • 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
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/84—Biological processes
    • B01D53/85—Biological processes with gas-solid contact
    • 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

Abstract

The invention discloses an animal carcass harmless cooking waste gas treatment system which comprises an air exhaust component, a cooling pretreatment device, an alkaline washing tower and a vertical secondary biological tower, wherein an air outlet of the air exhaust component is connected with an inlet of the cooling pretreatment device; the vertical secondary biological tower comprises an upper layer and a lower layer, wherein the lower layer is provided with a biological trickling filter layer, and the upper layer is provided with a biological filter layer. The invention provides a waste gas treatment system and a waste gas treatment method in the harmless carcass cooking treatment process of animals, which have low cost and high efficiency and are simple to operate. The invention adopts the process combination of alkaline washing, biological trickling filtration and biological filtration, and realizes the multi-stage high-efficiency treatment of waste gas in the process of stewing and disposing the harmless animal carcasses.

Description

System and method for treating animal carcass harmless cooking waste gas
Technical Field
The invention particularly relates to a system and a method for treating animal carcass harmless cooking waste gas.
Background
Epidemic animals and deteriorated meat products need to be subjected to harmless treatment so as to prevent the occurrence and spread of serious animal epidemic diseases. Generally, a high-temperature high-pressure cooking method is adopted to carry out harmless treatment on carcasses and deteriorated meat of epidemic animals, but a large amount of malodorous gas is generated in the process, and the harmful animal carcasses and deteriorated meat have certain influence on the ecological environment around harmless workshops and factories. The waste gas from harmless cooking of animal carcasses has complex components, and the main components are grease and H2S、NH3The odor components mainly comprise sulfur-containing and nitrogen-containing malodorous substances, and the odor threshold of the substances is low, so that the substances are easily sensed by the olfactory organs of human bodies, and therefore, the substances can still generate unpleasant emotion even at low concentration, and symptoms such as nausea and vomiting are caused in serious cases.
At present, the pollution treatment technology of organic waste gas comprises the following steps: absorption, adsorption, incineration, condensation, biological methods, and the like. Absorption methods use water or absorbents to remove water-soluble components of the exhaust gasConsumes a large amount of water and chemical agents, and is highly corrosive to equipment. The adsorption method usually adopts activated carbon as an adsorbent, so that toxic and harmful gas pollutants are transferred from a gas phase to a solid phase, but the pollutants are not completely removed and are released into the environment again during desorption, and secondary pollution is caused. The combustion is carried out at high temperature by fully combusting toxic and harmful gases to convert into CO2And H2And O, the combustion method has higher energy consumption and is suitable for treating high-concentration organic waste gas. The condensation recovery method is to introduce the organic waste gas into a condenser, and gradually condense VOCs into liquid state for recovery by utilizing different vapor partial pressures of the VOCs at different temperatures. The condensation recovery operation is simple, the effect is stable, but the energy consumption is high due to the excessively low condensation temperature, and the requirements of condensation on the performance of equipment and the investment and operating cost of the equipment are also high. The biological method utilizes the metabolism of the microorganism, has the advantages of strong adaptability, low investment and operation cost, small secondary pollution and the like, is a natural pollution treatment technology, and has good development prospect. However, the oily waste gas is directly treated by a biological method, which causes the blockage of the filler. And for waste gas with complex components, a single-stage biological method is adopted for treatment, so that the effect is limited.
In summary, in order to solve the influence of the malodor on the life of residents, aiming at the harmless cooking waste gas of the animal carcass containing grease and having complex components, a harmless animal carcass odor treatment system and a harmless animal carcass odor treatment method which are low in cost, small in occupied area, efficient, stable and simple in operation need to be developed.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a system and a method for treating the harmless cooking waste gas of animal carcasses.
In order to achieve the purpose, the technical scheme of the invention is as follows:
the animal carcass harmless cooking waste gas treatment system comprises an air exhaust component, a cooling pretreatment device, an alkaline washing tower and a vertical secondary biological tower, wherein an air outlet of the air exhaust component is connected with an air inlet of the cooling pretreatment device, an outlet of the cooling pretreatment device is connected with an air inlet at the bottom of the alkaline washing tower, and an air outlet at the top of the alkaline washing towerThe opening is connected with an air inlet at the bottom of the vertical secondary biological tower, and an air outlet is arranged at the top of the vertical secondary biological tower; the vertical secondary biological tower comprises an upper layer and a lower layer, the lower layer is provided with a biological trickling filter layer, the upper layer is provided with a biological filter layer, the cooling pretreatment device is used for cooling the waste gas, and the alkaline tower is used for removing partial grease and partial H in the waste gas2S and sulfur-containing organic matters, wherein the biological trickling filter layer utilizes microbial strains to remove NH in the waste gas3The biological filter layer removes residual H in the waste gas by using microbial strains2S, sulfur-containing organic matters and other organic matters.
Furthermore, the alkaline washing tower is a rotational flow plate tower and further comprises a drainage component for draining alkaline washing liquid to the center of the top of the alkaline washing tower, the drainage component comprises an alkaline washing water tank filled with the alkaline washing liquid, and the alkaline washing water tank is connected with a spray pump for draining the alkaline washing liquid in the alkaline washing water tank to the alkaline washing tower.
Further, the bio-trickling filter layer comprises a trickling filter tank and a trickling filter water pump, generated liquid generated after reaction of the alkaline washing tower is discharged into the trickling filter tank, the generated liquid is used for providing nutrition for microbial strains in the bio-trickling filter layer, and the nutrition comprises glycerol and Na+、S2-The spraying outlet of the trickling filter pump is arranged at the top of the biological trickling filter layer, and the trickling filter liquid is collected into the trickling filter tank for circulating spraying.
Further, a liquid collecting tank for collecting a generated liquid generated after reaction of the alkali liquor and the cooking waste gas is arranged at the bottom of the alkaline tower, the liquid collecting tank is communicated with an alkaline washing water tank, the alkaline washing water tank is communicated with a water dripping and filtering tank, and a corrosion-resistant pump and a check valve are sequentially arranged between the alkaline washing water tank and the water dripping and filtering tank.
Further, a mixed filler is arranged in the biological filter layer, the mixed filler is composed of compost, ceramsite and limestone, and the volume ratio of each medium is that the compost: ceramsite: 5-8% of limestone: 75-81%: 14-20%;
the biological trickling filter layer is internally provided with biological fillers with a core-shell structure, and the patent numbers are as follows: ZL201511004650.4, which is composed of 20-30% of activated sludge, 0.2-1% of deodorizing microbial inoculum, 15-25% of bamboo charcoal powder, 2-5% of iron oxide red, 8-15% of calcium oxide and 35-50% of silicate inorganic gel.
Due to the arrangement, because a plurality of pores exist on the surface of the biological filler with the core-shell structure, the oxygen in the waste gas forms an aerobic environment, NH, on the surface of the filler3And NO produced by nitrogen-containing organic matter under the condition of microbial degradation3 -The concentration difference exists between the NO and the filler, and NO is pushed by the concentration difference3 -Transferring to the interior of the filler, in an anoxic environment inside the filler, by the action of denitrifying bacteria, NO3 -Further reaction to form N2And then discharged outside through the apertures.
Furthermore, the biological filter layer also comprises a filter water tank and a filter water pump, wherein the filter water tank is filled with reclaimed water, a spray outlet of the filter water pump is arranged at the top of the biological filter layer, part of spray liquid is intercepted by the mixed filler, the rest spray liquid penetrates through the biological filter layer and drips into the biological trickling filter layer, the spray liquid is not circulated, nutrient salt released slowly in the mixed filler is used as a nutrient source of microbial strains in the biological trickling filter layer, and the nutrient salt comprises NO3 -、PO4 3-、SO4 2-、K+、Fe3+、Mg2 +、Ca2+、Na+。
Further, the microbial species in the bio-trickling filter include axydans, paracoccus mutilans, methylophila, pseudomonas stutzeri.
Further, the microbial species within the biofiltration layer include Thiobacillus ferrooxidans, Thiobacillus thioparvum, Thiobacillus thiooxidans, Thiobacillus denitrificans, Micromyceliophthora, Xanthomonas, S.acidocaldarius, Acidicanus, Brierieyt, Pseudomonas stutzeri, Bacillus, Arthrobacter.
The method for treating the harmless waste cooking gas of the animal carcass uses the harmless waste cooking gas treatment system of the animal carcass, and specifically comprises the following steps:
self-contaminationThe cooking waste gas collected from the source is pressurized by an air exhaust assembly, is conveyed by an air pipe to enter an alkaline washing tower for alkaline washing after being subjected to cooling pretreatment, the cooking waste gas enters from the bottom of the alkaline washing tower and passes through the alkaline washing tower from bottom to top, the grease in the cooking waste gas passes through the alkaline washing tower and undergoes saponification reaction with alkaline liquor, and H is2The acid gases such as S and the like and the alkali liquor generate neutralization reaction to lead most of grease and part of H2S and sulfur-containing organic matters are removed, and the cooking waste gas passes through a vertical secondary biological tower from bottom to top and sequentially passes through a biological trickling filter layer and a biological filter layer after coming out of the alkaline washing tower;
the biological trickling filter layer is internally provided with core-shell structured biological filler, generated liquid after the alkaline washing tower reaction is pumped into the trickling filter tank through a corrosion-resistant pump, the core-shell structured biological filler utilizes the trickling filter pump to continuously spray alkaline washing tower generated liquid in the trickling filter tank to keep moist, a liquid film is formed on the surface of the core-shell structured biological filler, and meanwhile, nutrition is provided for microbial strains of the biological trickling filter layer;
mixed filler is arranged in the biological filter layer, the mixed filler is used for regularly spraying reclaimed water in a filter water tank by using a filter water pump to keep moist, and the boiled waste gas after alkali washing passes through the biological filler with the core-shell structure of the biological trickling filter layer and the mixed filler of the biological filter layer from bottom to top and forms a liquid film on the surface of the mixed filler;
pollutant molecules of the boiling waste gas after alkali washing are diffused to a liquid film through a gas film, are further diffused to biological films on the surfaces of the biological filler and the mixed filler of the core-shell structure under the pushing of concentration difference, are adsorbed and degraded by microbial strains, and are discharged out of the vertical secondary biological tower.
Compared with the prior art, the invention has the following advantages:
the invention provides a waste gas treatment system and a waste gas treatment method in the harmless carcass cooking treatment process of animals, which have low cost and high efficiency and are simple to operate. Most of grease in the waste gas is removed by the alkaline washing pretreatment process, so that the filler blockage of a subsequent bio-trickling filter section is avoided, and partial nutrition is provided for microbial strains of the bio-trickling filter section. The biological filtration section adopts the mixed filler capable of slowly releasing nutrient salt, can provide nutrition for microbial strains in the biological filtration section and the biological trickling filtration section at the same time, does not need to be additionally provided with nutrient solution, and saves labor and cost. The biological trickling filtration section and the biological filtration section adopt different water tanks to provide spraying liquid, and the spraying amount and the components of the spraying liquid can be flexibly adjusted. The invention adopts the process combination of alkaline washing, biological trickling filtration and biological filtration, and realizes the multi-stage high-efficiency treatment of waste gas in the process of stewing and disposing the harmless animal carcasses.
Drawings
FIG. 1 is a schematic structural diagram of a waste gas treatment system and method for harmless digestion of animal carcasses;
description of reference numerals: 1. an exhaust fan; 2. an alkaline washing tower; 21. a swirl plate; 22. an overflow pipe; 23. a defogging plate; 24. an alkaline washing water tank; 25. a spray pump; 26. a liquid collecting tank; 27. a corrosion resistant pump; 28. a check valve; 3. a vertical secondary biological tower; 31. a bio-trickling filter layer; 311. core-shell structured biological fillers; 312. a water dripping and filtering tank; 313. a trickling water pump; 32. a biological filtration layer; 321. mixing the fillers; 322. a filtering water tank; 323. and (5) filtering the water pump.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Example 1:
as shown in fig. 1, the animal carcass harmless cooking waste gas treatment system comprises an air extraction component, a cooling pretreatment device, an alkaline tower 2 and a vertical secondary biological tower 3, wherein the air extraction component is specifically an exhaust fan 1, an air outlet of the exhaust fan 1 is connected with an inlet of the cooling pretreatment device, an outlet of the cooling pretreatment device is connected with an air inlet at the bottom of the alkaline tower 2, an air outlet at the top of the alkaline tower 2 is connected with an air inlet at the bottom of the vertical secondary biological tower 3, and an air outlet is arranged at the top of the vertical secondary biological tower 3; the vertical secondary biological tower 3 comprises an upper layer and a lower layer, wherein the lower layer is provided with a biological trickling filter layer 31, and the upper layer is provided with a biological filter layer 32. The waste gas is sucked from the exhaust fan 1, sequentially passes through the low-temperature pretreatment device, the alkaline washing tower 2, the bio-trickling filter 31 and the bio-filter layer 32, and finally is discharged from an air outlet at the top of the vertical secondary biological tower 3.
In the whole system, a cooling pretreatment device is used for cooling the waste gas, and the alkaline tower 2 is used for removing most of grease and part of H in the waste gas2S and sulfur-containing organic matters, microbial strains including axydans, colleague paracoccus, methylophile, pseudomonas stutzeri and the like are cultured in the biological trickling filter layer 31 and are used for removing NH in the waste gas3Nitrogen-containing organic matter, and microbial species including Thiobacillus ferrooxidans, Thiobacillus thiooxidans, Thiobacillus denitrificans, Microbacterium filarians, Xanthomonas campestris, S.acidocaldarius, Acidicananus, Bririeyt, Pseudomonas stutzeri, Bacillus, Arthrobacter, etc. cultured in the biological filter layer 32 for removing residual H in the exhaust gas2S, sulfur-containing organic matters and other organic matters.
Specifically, alkaline tower 2 is whirl board tower, including being used for drainage to alkaline wash liquid drainage component at 2 top centers of alkaline tower, is equipped with a plurality of layers of whirl subassembly in the alkaline tower 2, and the whirl subassembly includes whirl board 21 and sets up overflow pipe 22 in whirl board 21 below, and overflow pipe 22 is used for drainage to the middle part of the whirl board 21 of lower floor with the alkaline wash on this layer of whirl board 21, and the top still is equipped with defogging board 23 in the alkaline tower 2. The drainage component comprises an alkaline washing water tank 24 filled with alkaline washing liquid, the alkaline washing water tank 24 is arranged at the bottom of the outer side of the alkaline washing tower 2, a spray pump 25 is connected to the alkaline washing water tank 24, a spray outlet of the spray pump 25 is connected to the middle position of the top of the alkaline washing tower 2, a liquid collecting tank 26 for collecting generated liquid after neutralization reaction is arranged at the bottom of the alkaline washing tower 2, and the liquid collecting tank 26 is communicated with the alkaline washing water tank 24.
When the whirl plate tower is in operation, every blade of whirl plate 21 is evenly distributed to the alkali wash through the blind plate in the middle of whirl plate 21, forms the active big thin liquid layer in surface, produces rotatory and centrifugal motion when waste gas passes through the blade, and the alkali lye that sprays from the top down fully contacts and reacts with rotatory ascending waste gas, spouts into tiny liquid drop then, gets rid of to the tower wall. The liquid drops are collected into overflow pipe 22 by gravity and flow to the blind area of the next cyclone plate 21 through overflow pipe 22 to continue to react with the waste gas. Most of grease in the waste gas after the reaction in the alkaline washing tower 2 is removed, and the subsequent bio-trickling filter 31 cannot be blocked by the filler.
The alkaline washing liquid in the alkaline washing tower 2 and the grease in the waste gas are subjected to saponification reaction to generate glycerol and higher fatty acid sodium, and the alkaline washing liquid in the alkaline washing tower 2 and the H in the waste gas2The S and the acidic organic matter are subjected to neutralization reaction to generate Na2S and other sodium salts, the generated liquid after the reaction of the alkaline tower 2 is collected by the liquid collecting tank 26 and then is introduced into the alkaline washing water tank 24, and the alkaline washing water tank 24 is communicated with the trickling water filter tank 312 to provide part of nutrition, such as carbon source, sodium salt and sulfur source, for the microorganisms of the biological trickling filter layer 31. An anti-corrosion pump 27 and a check valve 28 are sequentially arranged between the alkali wash water tank 24 and the water dripping and filtering tank 312, and the check valve 28 can prevent liquid in the water dripping and filtering tank 312 from flowing back into the alkali wash water tank 24.
The biological trickling filter 31 comprises a trickling filter tank 312 and a trickling filter pump 313, the trickling filter tank 312 is filled with the generated liquid after the reaction of the alkaline washing tower 2, and a spraying outlet of the trickling filter pump 313 is arranged at the top of the biological trickling filter 31. The biological trickling filter layer 31 is internally provided with a core-shell structured biological filler 311, and the core-shell structured biological filler 311 consists of 20 to 30 percent of activated sludge, 0.2 to 1 percent of deodorant microbial inoculum, 15 to 25 percent of bamboo charcoal powder, 2 to 5 percent of iron oxide red, 8 to 15 percent of calcium oxide and 35 to 50 percent of silicate inorganic gel.
The biological filter layer 32 comprises a filter water tank 322 and a filter water pump 323, the filter water tank 322 is filled with reclaimed water, and a spray outlet of the filter water pump 323 is arranged at the top of the biological filter layer 32. A mixed filler 321 is arranged in the biological filter layer 32, the mixed filler 321 is composed of compost, ceramsite and limestone, and the volume ratio of each medium is compost: ceramsite: 5-8% of limestone: 75-81%: 14 to 20 percent.
The surface of the core-shell structured biological filler 311 of the biological trickling filter layer 31 has a plurality of pores, and the oxygen in the waste gas forms an aerobic environment, NH, on the surface of the filler3And NO produced by nitrogen-containing organic matter under the condition of microbial degradation3 -The concentration difference exists between the NO and the filler, and NO is pushed by the concentration difference3 -Transferring to the interior of the filler, in an anoxic environment inside the filler, by the action of denitrifying bacteria, NO3 -Further againstShould generate N2And then discharged outside through the apertures.
The microorganism nutrition of the biological trickling filter 31 is derived from the generated liquid after the reaction of the alkaline washing tower 2 and NO slowly released from the mixed filler 321 of the biological filtering section3 -、PO4 3-、SO4 2-、K+、Fe3+、Mg2+、Ca2+、Na+And the like. Since bio-trickling filter 31 is below bio-filter 32, nutrient salts released by bio-filter 32 will drip into bio-trickling filter 31. The biological trickling filter layer 31 is sprayed circularly with the spraying amount of 0.05-20 m3/(m2H), the spraying liquid is lifted to the top of the trickling filter layer by the trickling filter pump 313 from the circulating water tank and sprayed downwards, a small amount of the spraying liquid is intercepted by the biological filler 311 with the core-shell structure, and most of the spraying liquid penetrates through the biological filler 311 with the core-shell structure and falls back to the trickling filter tank 312 to enter the next cycle.
The microbial nutrition of the bio-filter layer 32 is derived from the slow release of NO in the reclaimed water and mixed packing 3213 -、PO4 3-、SO4 2-、K+、Fe3+、Mg2+、Ca2+、Na+The biological filter layer 32 is sprayed in a non-circulating way, and the spraying amount is 4-5L/(m)3H), the spray is sprayed down from the top of the bio-filter layer 32, most of the spray is trapped by the mixed packing 321, and a small portion of the mixed packing 321 penetrating the bio-filter layer 32 drops into the bio-trickling filter layer 31.
The method for treating the waste gas generated by harmless cooking of the animal carcasses adopts the waste gas treatment system for harmless cooking of the animal carcasses, and comprises the following steps:
s1: carrying out cooling pretreatment on the waste gas;
s2: the alkaline washing liquid and the waste gas are subjected to neutralization reaction to remove part of grease and part of H in the waste gas2S and sulfur-containing organic substances;
s3: the waste gas is subjected to biotrickling filtration by utilizing microbial strains such as axydans, colleague paracoccus, methylophile, pseudomonas stutzeri and the like to remove NH in the waste gas3Nitrogen-containing organic matter;
s4: the waste gas is biologically filtered by utilizing microorganism strains such as thiobacillus ferrooxidans, thiobacillus thiooxidans, thiobacillus denitrificans, filamentous microbe, xanthomonas, S.acidocaldarius, Acidicananus, Brierieyt, Pseudomonas stutzeri, bacillus, Arthrobacter and the like to remove residual H in the waste gas2S, sulfur-containing organic matters and other organic matters.
Specifically, in S2, a cyclone plate tower is utilized to fully react alkaline washing liquid with waste gas, saponification reaction and neutralization reaction are mainly carried out in the cyclone plate tower, and saponification reaction is carried out on the alkaline liquor in the cyclone plate tower and grease in the waste gas to generate glycerol and higher fatty acid sodium, so that grease is prevented from entering a biochemical section, filler blockage is avoided, and subsequent bio-trickling filtration and bio-filtration are influenced. Alkali liquor in the cyclone plate tower and H in the waste gas2The S and the acidic organic matter are subjected to neutralization reaction to generate Na2S and other sodium salts. And simultaneously, the generated solution obtained after the alkaline washing solution reacts with the waste gas is used for providing nutrition for the microbial strains of the biotrickling filter.
Specifically, in S3, the filler of the bio-trickling filter layer 31 is specifically a core-shell structured bio-filler 311, and the core-shell structured bio-filler 311 is composed of 20% to 30% of activated sludge, 0.2 to 1% of a deodorizing microbial agent, 15% to 25% of bamboo charcoal powder, 2% to 5% of iron oxide red, 8% to 15% of calcium oxide, and 35% to 50% of silicate inorganic gel. Spraying the generated liquid obtained after the alkaline washing liquid reacts with the waste gas from the top of the filler of the biological trickling filter layer 31, wherein the spraying amount is 0.05-20 m3/(m2H), spraying the spraying liquid from the top of the filler of the biological trickling filter layer 31, intercepting a small amount of the spraying liquid by the biological filler 311 with the core-shell structure, allowing most of the spraying liquid to penetrate through the biological filler 311 with the core-shell structure and drip out, collecting the spraying liquid, spraying the collected spraying liquid to the top of the filler of the biological trickling filter layer 31 again, and performing circulating spraying.
Specifically, in S4, the filler of the biological filter layer 32 is specifically a mixed filler 321, the mixed filler 321 is composed of compost, ceramsite and limestone, and the volume ratio of each medium is compost: ceramsite: 5-8% of limestone: 75-81%: 14 to 20 percent. Simultaneously, the top of the filler of the biological filter layer 32 is sprayed with reclaimed water, and the reclaimed water and the mixed filler 321 are utilized for slow releaseNO of3 -、PO4 3-、SO4 2-、K+、Fe3+、Mg2+、Ca2+、Na+The nutrient salts provide nutrition for the microbial strains of the biological filter layer 32, and the spraying amount of the reclaimed water is 4-5L/(m)3H), the spray liquid is sprayed from the top of the filler of the biological filter layer 32, most of the spray liquid is intercepted by the mixed filler 321, and a small part of the mixed filler 321 penetrating through the filler of the biological filter layer 32 drips out and falls on the biological filler with the core-shell structure of the biological trickling filter layer 31 to provide nutrition for the microbial strains of the biological trickling filter layer 31.
The cooking waste gas collected from a pollution source is pressurized by a fan, is subjected to cooling pretreatment, is conveyed by an air pipe and enters the bottom of an alkaline tower 2 through an air inlet, the cooking waste gas passes through the alkaline tower 2 from bottom to top, an alkaline liquor of the alkaline tower 2 is provided by a water tank and a spray pump 25, is sprayed from top to bottom and flows layer by layer through an overflow pipe 22, the cooking waste gas and the alkaline liquor are in full contact reaction through a cyclone plate 21, grease in the cooking waste gas and the alkaline liquor are subjected to saponification reaction, and H is2The acid gases such as S and the like and the alkali liquor generate neutralization reaction to lead most of grease and part of H2S and sulfur-containing organic matters are removed, and finally the sulfur-containing organic matters pass through the demisting plates 23 and then enter the bottom of the vertical secondary biological tower 3 through the air pipes and the air inlets. The generated liquid after the reaction of the alkaline tower 2 is pumped into a circulating water tank of the biological trickling filter 31 through the corrosion-resistant pump 27 to provide nutrition for microorganisms of the biological trickling filter 31, and a check valve 28 is connected behind the corrosion-resistant pump 27 to prevent backflow. The boiling waste gas after alkaline washing passes through the core-shell structured biological filler 311 of the biological trickling filter layer 31 and the mixed filler 321 of the biological filter layer 32 from bottom to top, the core-shell structured biological filler 311 continuously sprays liquid generated by the alkaline washing tower 2 in the water tank by using a water pump and a spray head to keep moist, the mixed filler 321 regularly sprays reclaimed water in the water tank by using the water pump and the spray head to keep moist, and a layer of liquid film is formed on the surfaces of the core-shell structured biological filler 311 and the mixed filler 321. Pollutant molecules of the boiling waste gas after alkali washing are diffused to a liquid film from a gas film, and are further diffused to the biological films on the surfaces of the core-shell structured biological filler 311 and the mixed filler 321 under the promotion of concentration difference, and are filtered by microorganisms of the biological trickling filter layer 31The microbial strains in the strains and the biological filter layer 32 are discharged from the exhaust port after being adsorbed and degraded.
Example 2:
the exhaust gas treatment apparatus and method described in example 1, except that: the mixed filler 17 of the biological filter layer 32 consists of compost, ceramsite and limestone, and the volume ratio of each medium is that of the compost: ceramsite: 5% of limestone: 75%: 20 percent.
Example 3:
the exhaust gas treatment apparatus and method described in example 1, except that: the packing volume ratio of the bio-trickling filter layer 31 to the bio-filter layer 32 is 2: 1.
The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention accordingly, and not to limit the protection scope of the present invention accordingly. All equivalent changes or modifications made in accordance with the spirit of the present disclosure are intended to be covered by the scope of the present disclosure.

Claims (9)

1. The utility model provides an animal carcass innocent treatment system of cooking waste gas which characterized in that: the device comprises an air exhaust component, a cooling pretreatment device, an alkaline tower (2) and a vertical secondary biological tower (3), wherein an air outlet of the air exhaust component is connected with an air inlet of the cooling pretreatment device, an outlet of the cooling pretreatment device is connected with an air inlet at the bottom of the alkaline tower (2), an air outlet at the top of the alkaline tower (2) is connected with an air inlet at the bottom of the vertical secondary biological tower (3), and an air outlet is arranged at the top of the vertical secondary biological tower (3); vertical second grade biological tower (3) are including upper strata and lower floor, the lower floor is equipped with biological trickling filter (31), the upper strata is equipped with biological filter layer (32), cooling preprocessing device is used for cooling down the processing with waste gas, alkaline tower (2) are arranged in getting rid of partial grease, partial H in the waste gas2S and sulfur-containing organic matters, wherein the biological trickling filter layer (31) removes NH in the waste gas by using microbial strains3The biological filter layer (32) removes residual H in the waste gas by using microbial strains2S, sulfur-containing organic substance and the likeAnd (c) other organic matters.
2. The animal carcass harmless cooking exhaust gas treatment system according to claim 1, wherein: the alkaline washing tower (2) is a cyclone plate tower and further comprises a drainage component for draining alkaline washing liquid to the center of the top of the alkaline washing tower (2), the drainage component comprises an alkaline washing water tank (24) filled with the alkaline washing liquid, and the alkaline washing water tank (24) is connected with a spray pump (25) for draining the alkaline washing liquid in the alkaline washing water tank (24) into the alkaline washing tower (2).
3. The system for treating a carcass harmless cooking exhaust gas according to claim 2, wherein: the biological trickling filter layer (31) comprises a trickling filter tank (312) and a trickling filter water pump (313), generated liquid after reaction of the alkaline washing tower (2) is discharged into the trickling filter tank (312), the generated liquid is used for providing nutrition for microbial strains in the biological trickling filter layer (31), and the nutrition comprises glycerol and Na+、S2-The spraying outlet of the trickling filter water pump (313) is arranged at the top of the biological trickling filter layer (31), and the trickling filtered liquid is collected into a trickling filter water tank (312) for circular spraying.
4. The system for treating a carcass harmless cooking exhaust gas according to claim 3, wherein: the bottom of the alkaline tower (2) is provided with a liquid collecting tank (26) for collecting a generated liquid generated after reaction of alkaline liquor and cooking waste gas, the liquid collecting tank (26) is communicated with an alkaline washing water tank (24), the alkaline washing water tank (24) is communicated with a water dripping and filtering tank (312), and a corrosion-resistant pump (27) and a check valve (28) are sequentially arranged between the alkaline washing water tank (24) and the water dripping and filtering tank (312).
5. The animal carcass harmless cooking exhaust gas treatment system according to claim 1, wherein: the biological filter layer (32) is internally provided with mixed filler (321), the mixed filler (321) is composed of compost, ceramsite and limestone, and the volume ratio of each medium is that the compost: ceramsite: 5-8% of limestone: 75-81%: 14-20%;
the biological trickling filter (31) is internally provided with a core-shell structured biological filler (311) with the patent numbers: ZL 201511004650.4.
6. The system for treating a carcass harmless cooking exhaust gas according to claim 5, wherein: the biological filter layer (32) further comprises a filter water tank (322) and a filter water pump (323), the filter water tank (322) is filled with reclaimed water, a spray outlet of the filter water pump (323) is arranged at the top of the biological filter layer (32), part of spray liquid is intercepted by the mixed filler (321), the rest of spray liquid penetrates through the biological filter layer (32) and drops into the biological filter layer (31), circulating spray is not carried out, nutrient salt slowly released from the mixed filler (321) is used as a nutrient source of microbial strains in the biological filter layer (31), and the nutrient salt comprises NO3 -、PO4 3-、SO4 2-、K+、Fe3+、Mg2+、Ca2+、Na+。
7. The animal carcass harmless cooking exhaust gas treatment system according to claim 1, wherein: the microbial strains in the biological trickling filter layer comprise axydans, paracoccus mutilans, methylophilus and pseudomonas stutzeri.
8. The animal carcass harmless cooking exhaust gas treatment system according to claim 1, wherein: the microbial strains in the biological filter layer comprise thiobacillus ferrooxidans, thiobacillus thiooxidans, thiobacillus denitrificans, Microbacterium serigenes, Xanthomonas campestris, S.acidocaldarius, Acidicandus, Bririeyt, Pseudomonas stutzeri, Bacillus and Arthrobacter.
9. A method for treating a waste gas from harmless cooking of animal carcasses, which comprises using the waste gas treatment system for harmless cooking of animal carcasses according to any one of claims 1 to 8, characterized in that: the method comprises the following steps:
the boiling waste gas collected from the pollution source is pressurized by the air exhaust component, is conveyed into the alkaline washing tower (2) for alkaline washing through the air pipe after being subjected to temperature reduction pretreatment, and the boiling waste gas flows from the alkaline washing tower(2) The oil in the cooking waste gas passes through the alkali wash tower (2) from bottom to top, and the saponification reaction of the oil in the cooking waste gas and alkali liquor occurs through the alkali wash tower (2), and H2The acid gases such as S and the like and the alkali liquor generate neutralization reaction to lead most of grease and part of H2S and sulfur-containing organic matters are removed, and the cooking waste gas passes through the vertical secondary biological tower (3) from bottom to top after coming out of the alkaline washing tower (2) and sequentially passes through a biological trickling filter layer (31) and a biological filter layer (32);
a biological filter layer (31) is internally provided with a core-shell structured biological filler (311), a generated liquid after the reaction of the alkaline washing tower (2) is pumped into the trickling water filter tank (312) through a corrosion-resistant pump (27), the core-shell structured biological filler (311) continuously sprays the generated liquid of the alkaline washing tower (2) in the trickling water filter tank (312) by using a trickling water pump (313) to keep moist, a liquid film is formed on the surface of the core-shell structured biological filler (311), and meanwhile, nutrition is provided for microbial strains of the biological filter layer (31);
mixed filler (321) is arranged in the biological filter layer (32), the mixed filler (321) utilizes a filter water pump (323) to regularly spray reclaimed water in a filter water tank (322) to keep moist, and the boiled waste gas after alkali washing passes through the core-shell structure biological filler (311) of the biological trickling filter layer (31) and the mixed filler (321) of the biological filter layer (32) from bottom to top, and forms a layer of liquid film on the surface of the mixed filler (321);
pollutant molecules of the boiling waste gas after alkali washing are diffused to a liquid film through a gas film, are further diffused to biological films on the surfaces of the core-shell structured biological filler (311) and the mixed filler (321) under the pushing of concentration difference, are adsorbed and degraded by microbial strains, and are discharged out of the vertical secondary biological tower (3).
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Publication number Priority date Publication date Assignee Title
CN114028933A (en) * 2021-11-25 2022-02-11 江南大学 Oil-containing waste gas treatment device and method

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CN110681248A (en) * 2019-11-12 2020-01-14 中国科学院生态环境研究中心 Municipal malodor multi-stage combined deodorization reactor and use method thereof

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110681248A (en) * 2019-11-12 2020-01-14 中国科学院生态环境研究中心 Municipal malodor multi-stage combined deodorization reactor and use method thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114028933A (en) * 2021-11-25 2022-02-11 江南大学 Oil-containing waste gas treatment device and method
CN114028933B (en) * 2021-11-25 2022-08-16 江南大学 Oil-containing waste gas treatment device and method

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