CN111298636A - Method for treating tail gas generated in amino acid spraying granulation - Google Patents
Method for treating tail gas generated in amino acid spraying granulation Download PDFInfo
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- CN111298636A CN111298636A CN201911282402.4A CN201911282402A CN111298636A CN 111298636 A CN111298636 A CN 111298636A CN 201911282402 A CN201911282402 A CN 201911282402A CN 111298636 A CN111298636 A CN 111298636A
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- 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
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- 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
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Abstract
The invention belongs to the technical field of environmental protection, and discloses a method for reducing peculiar smell of tail gas in slurry spraying granulation, which comprises the following steps: firstly, spraying and washing the waste water by a spraying and washing tower, cooling the waste water to 30-35 ℃, then treating the waste water in a reaction chamber filled with biological agents to obtain tail gas, and discharging the tail gas after the treatment is finished. The invention has the advantages of fewer strains, relatively simple operation process parameters, reduced risk of strain pollution, lower carrier raw material cost and reduced enterprise burden.
Description
Technical Field
The invention belongs to the technical field of environmental protection, and particularly relates to a method for treating tail gas generated in amino acid spraying granulation.
Background
Spray granulation is a process of spraying water (a general term for a liquid capable of being vaporized) in slurry (a mixture, a solution and a solute) into equipment, vaporizing the water in the slurry by heating and pumping, separating, and forming the remaining solid which is not vaporized (under certain conditions) into granules, which is called spray granulation.
In the process of preparing the compound fertilizer by using the amino acid waste liquid in the compound fertilizer workshop, a spraying granulation technology is adopted, the tail gas has more complex components, and mainly contains floating dust, dust and fine compound fertilizer particles, and the main gas component is a large amount of toxic and pungent gas caused by fire coal. The main gas components comprise hydrogen sulfide, sulfur dioxide, ammonia nitrogen, ketones, aldehydes, esters, benzene dust, water vapor and the like. Particularly, in rainy days or at low air pressure, the smoke in factory areas and residential areas nearby is always lost, the harm of acid mist and acid rain is serious, the emission concentration of smoke dust and waste gas far exceeds the regulations of national emission standards, and great negative effects are generated on the environment and human bodies, so that the tail gas treatment of compound fertilizer plants is not slow and needs to be treated. How to reduce the peculiar smell of the tail gas in the slurry spraying granulation is a technical problem which needs to be solved.
The applicant's prior patent technology ' 201610508054, a treatment method for cooling, deodorizing, desulfurizing and denitrifying spraying granulation tail gas ' discloses a treatment method for cooling, deodorizing, desulfurizing and denitrifying spraying granulation tail gas, which comprises the following steps: the spraying granulation tail gas is firstly cooled and dedusted by a Venturi spray tower and an electrostatic precipitator, then is deodorized by a plasma reactor, then passes through an ozone generator, and finally enters a reactor filled with an adsorbent for desulfurization and denitrification treatment, and is discharged after the treatment is finished; the adsorbent is prepared from various materials and has a good adsorption effect; however, the adsorbent has poor regeneration capability, and a large amount of waste is generated after the adsorbent is used, so that resource waste is caused. The inventor's prior patent technology ' 201410586080, a method for removing harmful gases in boiler flue gas ', discloses a method for treating harmful gases in flue gas by combining chemical agents and biological agents, wherein two agents are required in the method, and four microorganisms are used in the biological agents for compatibility, so that pollution is easily caused, and the process parameters are complex and difficult to master for general enterprises. In the document of the tail gas treatment method of the compound fertilizer spraying granulator, 2008 of fermentation science and technology communication, the tail gas of the spraying granulator firstly enters a gravity settling chamber, most of smoke dust and compound fertilizer particles are separated from smoke gas by utilizing the gravity settling effect, the product is formed after granulation by a disc granulator, except for the case of annual production of 3 ten thousand of glutamic acid, the tail gas generated every day is discharged through secondary washing. The method needs to consume a large amount of water resources, causes great burden to the environment, and has incomplete tail gas treatment.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a method for treating tail gas generated in the process of spraying granulation of amino acid, which is energy-saving and environment-friendly and has high treatment efficiency.
In order to achieve the purpose, the invention provides the following technical scheme:
a method for reducing peculiar smell of tail gas in slurry spraying granulation comprises the following steps:
firstly, spraying and washing the waste water by a spraying and washing tower, cooling the waste water to 30-35 ℃, then treating the waste water in a reaction chamber filled with biological agents to obtain tail gas, and discharging the tail gas after the treatment is finished.
Further, the biological agent is prepared according to the following steps: step 1) preparing a carrier, step 2) preparing a fermentation liquid, and step 3) preparing a biological agent.
Further, the biological agent is prepared according to the following steps:
step 1) preparation of a carrier: putting the corn straws into a pulverizer, and sieving the pulverized corn straws with a 100-mesh sieve to obtain straw powder; putting the furnace slag into a crusher, crushing and sieving with a 50-mesh sieve to obtain furnace slag powder; adding straw powder, slag powder, clay and phosphoric acid solution into a reaction kettle, stirring at 300rpm for 10-20min, then granulating in a roller granulator, controlling the particle size to be 1-2mm, and drying at 100 ℃ for 15-30min to obtain a carrier;
step 2) preparing fermentation liquor: transferring the Trichoderma reesei seed solution into a fermentation tank culture medium according to the inoculation amount of 6% by volume ratio for culturing for 6h, then inoculating the Acidithiobacillus caldus seed solution according to the inoculation amount of 8% by volume ratio, continuing to culture for 6h, then inoculating the Bacillus stearothermophilus seed solution according to the inoculation amount of 10% by volume ratio, and continuing to culture for 18-24h to obtain fermentation liquor;
step 3) preparing a biological agent: mixing the fermentation liquid with the carrier under stirring, standing for 6-9 hr, drying at 20 deg.C to water content of 6-8 wt%, and packaging.
Preferably, the concentration of the phosphoric acid solution is 0.1 mol/L.
Preferably, the clay has a particle size of 100 mesh.
Preferably, the fermentor medium components are: 8wt% of molasses, 5wt% of corn steep liquor, 3wt% of glucose, 0.5wt% of dipotassium phosphate, 0.5wt% of potassium dihydrogen phosphate, 0.02wt% of magnesium sulfate, 0.01wt% of manganese sulfate, 0.01wt% of ferrous sulfate and the balance of water, wherein the pH value is 7.0.
Preferably, in the step 1), the straw powder, the slag powder, the clay and the phosphoric acid solution are added into the reaction kettle according to the mass ratio of 3-5:6-9:1-2: 10-15.
Preferably, in the step 3), the fermentation liquor and the carrier are stirred and mixed according to the mass ratio of 2-3: 3-4.
The strains of the present invention belong to known strains and can be purchased from ATCC and other commercial sources. The seed liquid preparation of each strain of the invention belongs to the conventional culture mode in the field, is not the innovation point of the invention and is not detailed here. The starting materials or reagents used in the present invention are commercially available unless otherwise specified.
The beneficial effects achieved by the invention mainly comprise but are not limited to the following aspects:
the carrier mainly adopts wastes in agricultural and industrial production, the cost of raw materials is low, in the preparation process of the carrier, the furnace slag belongs to industrial wastes, the adsorption performance is good, the carrier has a gap structure, but is alkaline, the carrier has a certain inhibition effect on bacterial strains, and the carrier is modified by phosphoric acid solution, so that the alkalinity is reduced, and the adhesion effect is improved; the straw powder can create a microenvironment suitable for the survival of the strains and provide a certain carbon source for the strains; the clay has higher adsorption capacity and certain bonding effect;
according to the invention, the carrier is used for adsorbing the tail gas, and then pollutants in the tail gas are removed through a microbial reaction, so that the carrier can be effectively adsorbed again without frequent replacement, and the cost and the operation flow are saved; compared with the conventional active carbon, the biological agent has better adsorption effect and greatly prolongs the service life;
the biological agent has the best effect on the tail gas pollutants, and the effect is superior to the combination mode of two strains, so that the three strains selected by the invention can be coordinately symbiotic and mutually promoted, and the treatment capacity on the tail gas pollutants is improved;
the invention has the advantages of fewer strains, relatively simple operation process parameters, reduced risk of strain pollution, lower carrier raw material cost and reduced enterprise burden.
Drawings
FIG. 1: the treatment effect of different treatment groups on pollutants;
FIG. 2: the treatment effect of different strain combination modes on pollutants.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present application, the present invention will be described more clearly and completely below with reference to specific embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
A method for reducing peculiar smell of tail gas in slurry spraying granulation comprises the following steps:
firstly, spraying and washing the waste gas by a spraying and washing tower, cooling the waste gas to 30 ℃, then treating the waste gas in a reaction chamber filled with biological agents, and discharging the waste gas after the treatment is finished;
the biological agent is prepared by the following process:
1) putting the corn straws into a pulverizer, and sieving the pulverized corn straws with a 100-mesh sieve to obtain straw powder; putting the furnace slag into a crusher, crushing and sieving with a 50-mesh sieve to obtain furnace slag powder; adding straw powder, slag powder, clay and phosphoric acid solution into a reaction kettle according to the mass ratio of 3:6:1:10, stirring at 300rpm for 10min, then feeding into a roller granulator for granulation, controlling the particle size to be 2mm, and then drying at 100 ℃ for 15min to obtain a carrier; the concentration of the phosphoric acid solution is 0.1 mol/L; the particle size of the clay is 100 meshes;
2) mixing seed solution (1 × 10) of Trichoderma reesei ATCC567658cfu/ml) was transferred to the fermenter medium at an inoculum size of 6% by volume for 6 hours and then inoculated with Acidithiobacillus caldus ATCC 51756 seed solution (1X 10) at an inoculum size of 8% by volume8cfu/ml), continuously culturing for 6h, inoculating Bacillus stearothermophilus ATCC7953 seed solution (3X 10) according to the inoculation amount of 10% by volume8cfu/ml), and continuously culturing for 18h to obtain a fermentation liquid; the fermentation tank culture medium comprises the following components: 8wt% of molasses, 5wt% of corn steep liquor, 3wt% of glucose, 0.5wt% of dipotassium phosphate, 0.5wt% of monopotassium phosphate, 0.02wt% of magnesium sulfate, 0.01wt% of manganese sulfate, 0.01wt% of ferrous sulfate and the balance of water, wherein the pH value is 7.0;
3) stirring and mixing the fermentation liquor and the carrier according to the mass ratio of 2:3, standing for 6h, then drying at the drying temperature of 20 ℃, and packaging after drying until the water content is 8 wt%.
Example 2
A method for reducing peculiar smell of tail gas in slurry spraying granulation comprises the following steps:
firstly, spraying and washing the waste gas by a spraying and washing tower, cooling the waste gas to 33 ℃, then treating the waste gas in a reaction chamber filled with biological agents, and discharging the waste gas after the treatment is finished;
the biological agent is prepared by the following process:
1) putting the corn straws into a pulverizer, and sieving the pulverized corn straws with a 100-mesh sieve to obtain straw powder; putting the furnace slag into a crusher, crushing and sieving with a 50-mesh sieve to obtain furnace slag powder; adding straw powder, slag powder, clay and phosphoric acid solution into a reaction kettle according to the mass ratio of 5:9:2:15, stirring at 300rpm for 10min, then feeding into a roller granulator for granulation, controlling the particle size to be 1mm, and then drying at 100 ℃ for 120min to obtain a carrier; the concentration of the phosphoric acid solution is 0.1 mol/L; the particle size of the clay is 100 meshes;
2) mixing seed solution (1 × 10) of Trichoderma reesei ATCC567658cfu/ml) was transferred to the fermenter medium at an inoculum size of 6% by volume for 6 hours and then inoculated with Acidithiobacillus caldus ATCC 51756 seed solution (1X 10) at an inoculum size of 8% by volume8cfu/ml), continuously culturing for 6h, inoculating Bacillus stearothermophilus ATCC7953 seed solution (3X 10) according to the inoculation amount of 10% by volume8cfu/ml), and continuously culturing for 24h to obtain a fermentation liquid; the fermentation tank culture medium comprises the following components: 8wt% of molasses, 5wt% of corn steep liquor, 3wt% of glucose, 0.5wt% of dipotassium phosphate, 0.5wt% of monopotassium phosphate, 0.02wt% of magnesium sulfate, 0.01wt% of manganese sulfate, 0.01wt% of ferrous sulfate and the balance of water, wherein the pH value is 7.0;
3) stirring and mixing the fermentation liquor and the carrier according to the mass ratio of 3:4, standing for 9h, then drying at the drying temperature of 20 ℃, and packaging to obtain the product, wherein the water content of the dried product is 7 wt%.
Example 3
Selecting tail gas of a Fufeng guniting granulation workshop for treatment, wherein the tail gas after spraying comprises the following components: h2S is 109mg/Nm3，SO2Is 132g/Nm3NOx of 93mg/Nm3The space velocity is 5000h-1；
Setting a control group: control group 1: the rest of the process is the same as the example 1 except that only the carrier is adopted and no microbial inoculum is added; control group 2: adopting a conventional activated carbon adsorbent; control group 3: the carrier is diatomaceous earth, as in example 1. Setting the treatment time to be 30min, measuring the removal effect of each pollutant, and comparing with a control group 1-3, as shown in figure 1, the treatment effect of the invention on the pollutants is better, and the service life exceeds 60d, thus, the invention adsorbs the tail gas through the adsorption carrier, and then removes the pollutants in the tail gas through the microbial reaction, so that the adsorption carrier can effectively adsorb again, frequent replacement is not needed, and the cost and the operation flow are saved; compared with the conventional activated carbon, the activated carbon has better adsorption effect and greatly prolonged service life.
Example 4
The invention also verifies the compatibility and synergy among all strains.
The experimental group used the biological preparation of example 1; control group 1: the procedure of example 1 was repeated except that Trichoderma reesei was not added; control group 2: the same procedure as in example 1 was repeated except that Acidithiobacillus caldus was not added; control group 3: the procedure of example 1 was repeated except that Bacillus stearothermophilus was not added;
selecting tail gas of a Fufeng guniting granulation workshop for treatment, wherein the tail gas after spraying comprises the following components: h2S is 109mg/Nm3，SO2Is 132mg/Nm3NOx of 93mg/Nm3The space velocity is 5000h-1(ii) a The treatment effect of each group is shown in figure 2, compared with a control group 1-3 adopting two compatible strains, the biological agent adopts three compatible strains, adopts a sequential inoculation mode, has the best effect on tail gas pollutants, and has a better effect than the combination mode of the two strains of the control group 1-3, thereby showing that the three strains selected by the invention can coordinate and symbiotically promote each other and improve the treatment capacity on the pollutants.
Although the present invention has been described in detail with respect to the general description and the specific embodiments, it will be apparent to those skilled in the art that modifications and improvements can be made based on the present invention. Accordingly, it is intended that all such modifications and variations as fall within the true spirit of this invention be included within the scope thereof.
Claims (8)
1. A method for reducing peculiar smell of tail gas in slurry spraying granulation comprises the following steps:
firstly, spraying and washing the waste water by a spraying and washing tower, cooling the waste water to 30-35 ℃, then treating the waste water in a reaction chamber filled with biological agents to obtain tail gas, and discharging the tail gas after the treatment is finished.
2. The method of claim 1, wherein the biological agent is prepared by the steps of: step 1) preparing a carrier, step 2) preparing a fermentation liquid, and step 3) preparing a biological agent.
3. The method according to claim 1 or 2, wherein the biological agent is prepared by the following steps:
step 1) preparation of a carrier: putting the corn straws into a pulverizer, and sieving the pulverized corn straws with a 100-mesh sieve to obtain straw powder; putting the furnace slag into a crusher, crushing and sieving with a 50-mesh sieve to obtain furnace slag powder; adding straw powder, slag powder, clay and phosphoric acid solution into a reaction kettle, stirring at 300rpm for 10-20min, then granulating in a roller granulator, controlling the particle size to be 1-2mm, and drying at 100 ℃ for 15-30min to obtain a carrier;
step 2) preparing fermentation liquor: transferring the Trichoderma reesei seed solution into a fermentation tank culture medium according to the inoculation amount of 6% by volume ratio for culturing for 6h, then inoculating the Acidithiobacillus caldus seed solution according to the inoculation amount of 8% by volume ratio, continuing to culture for 6h, then inoculating the Bacillus stearothermophilus seed solution according to the inoculation amount of 10% by volume ratio, and continuing to culture for 18-24h to obtain fermentation liquor;
step 3) preparing a biological agent: mixing the fermentation liquid with the carrier under stirring, standing for 6-9 hr, drying at 20 deg.C to water content of 6-8 wt%, and packaging.
4. The method according to claim 3, wherein the concentration of the phosphoric acid solution is 0.1 mol/L.
5. The method of claim 3, wherein the clay has a particle size of 100 mesh.
6. The method of claim 3, wherein the fermentor medium composition is: 8wt% of molasses, 5wt% of corn steep liquor, 3wt% of glucose, 0.5wt% of dipotassium phosphate, 0.5wt% of potassium dihydrogen phosphate, 0.02wt% of magnesium sulfate, 0.01wt% of manganese sulfate, 0.01wt% of ferrous sulfate and the balance of water, wherein the pH value is 7.0.
7. The method of claim 3, wherein in the step 1), the straw powder, the slag powder, the clay and the phosphoric acid solution are added into the reaction kettle according to a mass ratio of 3-5:6-9:1-2: 10-15.
8. The method according to claim 3, wherein in the step 3), the fermentation liquid and the carrier are mixed with stirring at a mass ratio of 2-3: 3-4.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109966908A (en) * | 2017-12-27 | 2019-07-05 | 许传高 | A method of reducing slurry-spraying pelletizing tail gas peculiar smell |
| CN109971650A (en) * | 2017-12-27 | 2019-07-05 | 许传高 | It is a kind of for removing the biological agent of slurry-spraying pelletizing tail gas peculiar smell |
| CN109988724A (en) * | 2017-12-31 | 2019-07-09 | 许传高 | A kind of resource utilization group technology of amino acid fermentation waste liquid |
| CN110102177A (en) * | 2019-04-09 | 2019-08-09 | 卢松 | A kind of technique purifying slurry-spraying pelletizing flue gas |
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- 2019-12-13 CN CN201911282402.4A patent/CN111298636A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109966908A (en) * | 2017-12-27 | 2019-07-05 | 许传高 | A method of reducing slurry-spraying pelletizing tail gas peculiar smell |
| CN109971650A (en) * | 2017-12-27 | 2019-07-05 | 许传高 | It is a kind of for removing the biological agent of slurry-spraying pelletizing tail gas peculiar smell |
| CN109988724A (en) * | 2017-12-31 | 2019-07-09 | 许传高 | A kind of resource utilization group technology of amino acid fermentation waste liquid |
| CN110102177A (en) * | 2019-04-09 | 2019-08-09 | 卢松 | A kind of technique purifying slurry-spraying pelletizing flue gas |
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