CN110102177B - Process for purifying flue gas generated in guniting granulation - Google Patents
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Abstract
The invention belongs to a process for purifying guniting granulation flue gas, which uses a microbial preparation, wherein the microbial preparation is prepared by the following steps: stirring and mixing the adsorption carrier and the compound bacterial liquid according to the mass ratio of 3-4:2-3, culturing at 30 ℃ for 6-18h, drying at 15-20 ℃, and packaging to obtain the product, wherein the water content of the dried product is 6-10 wt%. The adsorption carrier has good bacteria adsorption effect and good synergistic effect among strains, and the effect of purifying the flue gas generated by spraying granulation is correspondingly improved.
Description
Technical Field
The invention belongs to the technical field of environmental protection, and particularly relates to a process for purifying guniting granulation flue gas.
Background
Spray granulation is a process of making fine particles directly from a solution or slurry by means of evaporation, involving both spraying and drying processes. The slurry is first sprayed into mist micro liquid drop, and after the water is evaporated and taken away by hot air, the solid matter in the liquid drop is gathered into dry particle. Spray granulation is almost the only effective method for producing fine particles having an average particle diameter of several tens to several hundreds of micrometers using ultrafine particles of micron or submicron size. The prepared particles are approximately spherical and have certain particle size distribution. The whole granulation process is carried out in a closed system without dust and impurity pollution, so the method is mostly adopted by industries such as food, medicine, dye, non-metallic ore processing, catalyst, washing powder and the like. Its disadvantages are high water evaporation capacity, serious nozzle wear and more tail gas.
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 flue gas generated by spraying granulation is a technical problem which needs to be solved.
For the research on the flue gas produced by spraying granulation, the applicant has described more in the prior patent technologies, for example, the patent technology "CN 201610508054, a processing method for cooling, deodorizing, desulfurizing and denitrifying of tail gas produced by spraying granulation" discloses a processing method for cooling, deodorizing, desulfurizing and denitrifying of tail gas produced by spraying granulation, comprising 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 ability, and a large amount of waste is generated after use, which results in waste of resources. The patent technology 'CN 201410586080 in the past of the applicant, a method for removing harmful gases in boiler flue gas' discloses a method for treating the harmful gases in the flue gas by combining chemical preparations and biological agents, two preparations are needed in the method, four microorganisms are used in the biological agents for compatibility, pollution is easily caused, process parameters are complex, and the method is difficult to master for general enterprises. In view of the above research results, the applicant found that there still exist certain defects in the actual operation process, such as more strains, complicated culture process, and the whole process cannot be implemented once a certain strain is contaminated, and the amount of the strain adhering to the carrier still needs to be increased.
The previous research result of the applicant is 'a method for reducing peculiar smell of tail gas in spray granulation', biological agents are adopted to purify and absorb spray granulation smoke, and the biological agents are prepared from carriers and compound bacterial liquid. On the basis of the technology, the applicant continuously researches and improves the compatibility of the strains.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a process for purifying guniting granulation flue gas, wherein a microbial preparation is used in the process, the preparation comprises an adsorption carrier and composite bacteria, the adsorption effect of the carrier on the bacteria is good, the synergistic effect among all bacterial strains is good, and the effect of purifying the guniting granulation flue gas is correspondingly improved.
In order to achieve the purpose, the invention provides the following technical scheme:
a process for purifying flue gas generated in slurry spraying granulation is characterized in that a microbial preparation is used in the process.
Further, the air conditioner is provided with a fan,
the microbial preparation is prepared according to the following steps: stirring and mixing the adsorption carrier and the compound bacterial liquid according to the mass ratio of 3-4:2-3, culturing at 30 ℃ for 6-18h, drying at 15-20 ℃, and packaging to obtain the product, wherein the water content of the dried product is 6-10 wt%.
Further, the air conditioner is provided with a fan,
the preparation method of the adsorption carrier comprises the following steps: putting the straws into a pulverizer, and sieving the crushed 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 the straw powder, the slag powder, the attapulgite and the phosphoric acid solution into a reaction kettle according to the mass ratio of 5:10:1:12, stirring at 300rpm for 10min, then granulating, and drying at 100 ℃ for 30min to obtain the adsorption carrier.
Further, the preparation method of the compound bacterial liquid comprises the following steps: and uniformly mixing micrococcus luteus seed liquid, xylose-oxidizing achromobacter sp liquid and acidophilic thiobacillus ferrooxidans seed liquid according to the volume ratio of 3:2:5 to obtain the compound bacterial liquid.
Further, the concentration of the phosphoric acid solution is 0.1 mol/L; the particle size of the attapulgite is 200 meshes.
Preferably, the preparation method of the micrococcus luteus seed solution comprises the following steps: inoculating Micrococcus luteus to seed culture medium, culturing at 30 deg.C until viable count in product reaches 2.0 × 108cfu/ml, namely obtaining micrococcus luteus seed solution; the seed culture medium comprises the following components: yeast extract 5g/L, (NH)4) 2SO42g/L g, glucose 3g/L, K2HPO4 0.5g/L，KH2PO40.5g/L。
Preferably, the preparation method of the achromobacter xylosoxidans seed solution comprises the following steps: inoculating achromobacter xylosoxidans to a seed culture medium, and culturing at 28 deg.C until the viable count in the product reaches 1.0 × 108cfu/ml, namely, the achromobacter xylosoxidans seed solution is obtained; the seed culture medium comprises the following components: urea 1.0g/L, CH3 COONa 3.0g/L，MgC12 0.1g/L，CaC12 0.1g/L，KH2 PO4 0.5g/L，K2 HPO4 0.5g/L。
Preferably, the preparation method of the acidithiobacillus ferrooxidans seed liquid comprises the following steps: inoculating Acidithiobacillus ferrooxidans to seed culture medium, culturing at 28 deg.C until viable count in bacterial liquid reaches 5.0 × 108cfu/ml, namely obtaining acidophilic thiobacillus ferrooxidans seed liquid; the seed culture medium comprises the following components: (NH)4)2SO4 2g/L，KCl 0.1g/L，K2HPO40.5g/L，KH2PO4 0.5g/L，Ca(NO3)2 0.01g/L，FeSO4·7H2O 10g/L。
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:
according to the invention, the tail gas is adsorbed by the adsorption carrier, and then pollutants in the tail gas are removed through a microbial reaction, so that the adsorption carrier can be effectively adsorbed again without frequent replacement, and the cost and the operation flow are saved; compared with the conventional activated carbon, the microbial preparation has better adsorption effect and greatly prolonged service life; in the preparation process of the carrier, the furnace slag belongs to industrial waste, has good adsorption performance and a gap structure, is alkaline, has a certain inhibition effect on bacterial strains, is modified by a phosphoric acid solution, reduces the alkalinity and improves the adhesion effect; the straw powder can create a microenvironment suitable for the survival of the strains and provide a certain carbon source for the strains; the attapulgite has unique properties of dispersion, high temperature resistance, good corrosion resistance, higher adsorption capacity and better bonding effect; and substances with different particle sizes are adopted for granulation, so that a plurality of gap structures are formed.
Three strains are selected from the microbial preparation for compatibility; among them, the thiobacillus ferrooxidans has better desulfurization; micrococcus luteus belongs to heterotrophic denitrifying bacteria, and achromobacter xylosoxidans belongs to aerobic denitrifying strains and can remove nitrogen oxides; the smoke contains a certain amount of oxygen, but the concentration is lower, and under the low-concentration aerobic condition, a special heterotrophic denitrifying bacteria, aerobic denitrifying bacteria and thiobacillus coexisting microbial system is formed in the carrier, so that symbiosis is mutually promoted, and the synergistic effect is good;
the invention has the advantages of fewer strains, relatively simple operation process parameters, reduced risk of strain pollution, relatively low carrier raw material cost, relatively reduced enterprise burden and good application prospect.
Drawings
FIG. 1: flue gas purification indexes of different treatment groups;
FIG. 2: influence of different strain combinations on the flue gas purification effect.
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 process for purifying flue gas generated in slurry spraying and granulation comprises the following steps:
firstly, spraying and washing the waste gas by a spraying and washing tower, cooling the waste gas to 35 ℃, then introducing the waste gas into a reaction chamber filled with a microbial preparation for flue gas purification treatment, and discharging the waste gas after the treatment is finished;
the microbial preparation is prepared by the following process:
1) preparing an adsorption carrier: putting the straws into a pulverizer, and sieving the crushed 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, attapulgite and phosphoric acid solution into a reaction kettle according to the mass ratio of 5:10:1:12, 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 30min to obtain an adsorption carrier; the concentration of the phosphoric acid solution is 0.1 mol/L; the particle size of the attapulgite is 200 meshes;
2) preparing a composite bacterial liquid:
inoculating Micrococcus luteus ATCC 10240 to seed culture medium, and culturing at 30 deg.C until viable count in product reaches 2.0 × 108cfu/ml, namely obtaining micrococcus luteus seed solution; the seed culture medium comprises the following components: yeast extract 5g/L, (NH)4) 2SO42g/L g, glucose 3g/L, K2HPO4 0.5g/L，KH2PO4 0.5g/L；
Inoculating achromobacter xylosoxidans ATCC27061 into a seed culture medium, and culturing at 28 ℃ until the number of viable bacteria in the product reaches 1.0 multiplied by 108cfu/ml, namely, the achromobacter xylosoxidans seed solution is obtained; the seed culture medium comprises the following components: urea 1.0g/L，CH3 COONa 3.0g/L，MgC12 0.1g/L，CaC12 0.1g/L，KH2 PO4 0.5g/L，K2 HPO4 0.5g/L；
Inoculating Acidithiobacillus ferrooxidans ATCC 23270 into seed culture medium, and culturing at 28 deg.C until viable count in bacterial liquid reaches 5.0 × 108cfu/ml, namely obtaining acidophilic thiobacillus ferrooxidans seed liquid; the seed culture medium comprises the following components: (NH)4)2SO4 2g/L，KCl 0.1g/L，K2HPO4 0.5g/L，KH2PO4 0.5g/L，Ca(NO3)2 0.01g/L，FeSO4·7H2O 10g/L；
Uniformly mixing micrococcus luteus seed liquid, xylose-oxidizing achromobacter sp liquid and acidophilic thiobacillus ferrooxidans seed liquid according to the volume ratio of 3:2:5 to obtain a compound bacterial liquid;
3) stirring and mixing the carrier and the compound bacterial liquid according to the mass ratio of 3:2, culturing for 12h at 30 ℃, drying at 20 ℃, and packaging to obtain the microbial inoculum, wherein the water content of the microbial inoculum after drying is 10 wt%.
Example 2
A process for purifying flue gas generated in slurry spraying and 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 introducing the waste gas into a reaction chamber filled with a microbial preparation for flue gas purification treatment, and discharging the waste gas after the treatment is finished;
the microbial preparation is prepared by the following process:
1) preparing an adsorption carrier: putting the straws into a pulverizer, and sieving the crushed 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, attapulgite and phosphoric acid solution into a reaction kettle according to the mass ratio of 5:10:1:12, stirring at 300rpm for 10min, then feeding into a roller granulator for granulation, controlling the particle size to be 2-3mm, then placing at 100 ℃, and drying for 30min to obtain an adsorption carrier; the concentration of the phosphoric acid solution is 0.1 mol/L; the particle size of the attapulgite is 200 meshes;
2) preparing a composite bacterial liquid:
inoculating Micrococcus luteus ATCC 10240 to seed culture medium, and culturing at 30 deg.C until viable count in product reaches 2.0 × 108cfu/ml, namely obtaining micrococcus luteus seed solution; the components of the culture medium are as follows: the seed culture medium comprises the following components: yeast extract 5g/L, (NH)4) 2SO42g/L g, glucose 3g/L, K2HPO4 0.5g/L，KH2PO4 0.5g/L；
Inoculating achromobacter xylosoxidans ATCC27061 into a seed culture medium, and culturing at 28 ℃ until the number of viable bacteria in the product reaches 1.0 multiplied by 108cfu/ml, namely, the achromobacter xylosoxidans seed solution is obtained; the components of the culture medium are as follows: urea 1.0g/L, CH3COONa 3.0g/L，MgC12 0.1g/L，CaC12 0.1g/L，KH2 PO4 0.5g/L，K2 HPO4 0.5g/L；
Inoculating Acidithiobacillus ferrooxidans ATCC 23270 into seed culture medium, and culturing at 28 deg.C until viable count in bacterial liquid reaches 5.0 × 108cfu/ml, namely obtaining acidophilic thiobacillus ferrooxidans seed liquid; the seed culture medium comprises the following components: (NH)4)2SO4 2g/L，KCl 0.1g/L，K2HPO4 0.5g/L，KH2PO4 0.5g/L，Ca(NO3)2 0.01g/L，FeSO4·7H2O 10g/L；
Uniformly mixing micrococcus luteus seed liquid, xylose-oxidizing achromobacter sp liquid and acidophilic thiobacillus ferrooxidans seed liquid according to the volume ratio of 2:1:3 to obtain a compound bacterial liquid;
3) stirring and mixing the carrier and the compound bacterial liquid according to the mass ratio of 2:1, culturing for 12h at 30 ℃, drying at 20 ℃, and packaging to obtain the microbial inoculum, wherein the water content of the microbial inoculum after drying is 8 wt%.
Example 3
Selecting the spraying granulation flue gas of the spraying granulation workshop of the inner monfan feng for treatment, wherein the components of the sprayed tail gas are as follows: h2S is 146.7mg/Nm3，SO2139.4mg/Nm3NOx of 167.1mg/Nm3Temperature ofAt 33 ℃ and a space velocity of 5000h-1；
Comparative example 1 was set up: comparative example 1: the same as example 1 except that only the adsorption carrier is used and the composite bacterial liquid is not added; comparative example 2: the adsorption carrier is diatomite, and the rest is the same as the example 1; comparative example 3: slag was selected as the adsorption carrier, and the rest of the procedure was the same as in example 1. Experimental groups example 1 according to the invention was selected.
Setting the treatment time to be 60min, and measuring the removal rate of each pollutant, as shown in fig. 1, comparative example 1 only adopts a modified carrier to remove part of the smoke pollutants, but the treatment effect is obviously poorer than comparative examples 2-3 and experimental groups, the pollutant treatment is not thorough, and the composite bacterial liquid plays an important purification function; compared with the conventional diatomite carrier or unmodified slag carrier used in the comparative examples 2-3, the experimental group improves the adsorption performance and the adhesive force of the strain by improving the slag, is beneficial to the strain to perform biochemical reaction, and thoroughly removes and purifies pollutants in the smoke.
Example 4
The synergistic effect of each strain in the composite bacterial liquid is realized.
Selecting the guniting granulation flue gas of the spraying granulation workshop of the inner monfan feng (the same batch as the flue gas used in the example 3); setting different strain combinations, wherein the combination 1: micrococcus luteus + achromobacter xylosoxidans; and (3) combination 2: micrococcus luteus + thiobacillus ferrooxidans; and (3) combination: achromobacter xylosoxidans + thiobacillus ferrooxidans; and (4) combination: micrococcus luteus, achromobacter xylosoxidans and thiobacillus ferrooxidans. As shown in FIG. 2, compared with the combinations 1-3 using two strains, the combination 4 selects three strains for compatibility, wherein the thiobacillus ferrooxidans has better desulfurization; micrococcus luteus belongs to heterotrophic denitrifying bacteria, and achromobacter xylosoxidans belongs to aerobic denitrifying strains and can remove nitrogen oxides; the smoke contains a certain amount of oxygen, but the concentration is lower, under the low-concentration aerobic condition, a special heterotrophic denitrifying bacteria, aerobic denitrifying bacteria and thiobacillus coexisting microbial system is formed in the carrier, the symbiosis is mutually promoted, the synergistic effect is good, pollutants in the smoke are thoroughly purified, the energy is saved, the emission is reduced, and the environment is protected.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (5)
1. The process for purifying the flue gas generated by spraying granulation is characterized by using a microbial preparation, wherein the microbial preparation is prepared by the following steps: stirring and mixing the adsorption carrier and the compound bacterial liquid according to the mass ratio of 3-4:2-3, culturing at 30 ℃ for 6-18h, drying at 15-20 ℃, and packaging to obtain the compound bacterial liquid, wherein the water content of the compound bacterial liquid is 6-10 wt%;
the preparation method of the adsorption carrier comprises the following steps:
putting the straws into a pulverizer, and sieving the crushed 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, attapulgite and phosphoric acid solution into a reaction kettle according to the mass ratio of 5:10:1:12, stirring at 300rpm for 10min, then granulating, placing at 100 ℃, and drying for 30min to obtain an adsorption carrier;
the preparation method of the compound bacterial liquid comprises the following steps: uniformly mixing micrococcus luteus seed liquid, xylose-oxidizing achromobacter sp liquid and acidophilic thiobacillus ferrooxidans seed liquid according to the volume ratio of 3:2:5 to obtain a compound bacterial liquid;
the micrococcus luteus is ATCC 10240, the achromobacter xylosoxidans is ATCC27061, and the acidithiobacillus ferrooxidans is ATCC 23270.
2. The process according to claim 1, wherein the concentration of the phosphoric acid solution is 0.1 mol/L; the particle size of the attapulgite is 200 meshes.
3. The process of claim 1, wherein the preparation method of the micrococcus luteus seed solution comprises the following steps: inoculating Micrococcus luteus to seed culture medium, culturing at 30 deg.C until viable count in product reaches 2.0 × 108cfu/ml, namely obtaining micrococcus luteus seed solution; the seed culture medium comprises the following components: yeast extract 5g/L, (NH)4) 2SO42g/L, glucose 3g/L, K2HPO4 0.5g/L，KH2PO4 0.5g/L。
4. The process as claimed in claim 1, wherein the preparation method of the achromobacter xylosoxidans seed solution comprises the following steps: inoculating achromobacter xylosoxidans to a seed culture medium, and culturing at 28 deg.C until the viable count in the product reaches 1.0 × 108cfu/ml, namely, the achromobacter xylosoxidans seed solution is obtained; the seed culture medium comprises the following components: urea 1.0g/L, CH3COONa 3.0g/L，MgC12 0.1g/L，CaC12 0.1g/L，KH2 PO4 0.5g/L，K2 HPO4 0.5g/L。
5. The process of claim 1, wherein the preparation method of the Acidithiobacillus ferrooxidans seed solution comprises the following steps: inoculating Acidithiobacillus ferrooxidans to seed culture medium, culturing at 28 deg.C until viable count in bacterial liquid reaches 5.0 × 108cfu/ml, namely obtaining acidophilic thiobacillus ferrooxidans seed liquid; the seed culture medium comprises the following components: (NH)4)2SO42g/L，KCl 0.1g/L，K2HPO4 0.5g/L，KH2PO4 0.5g/L，Ca(NO3)2 0.01g/L，FeSO4·7H2O 10g/L。
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| CN110938571A (en) * | 2019-09-17 | 2020-03-31 | 赵兰坤 | Biological agent for treating tail gas of guniting granulation |
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