CN111569640A - Threonine fermentation tail gas environment-friendly treatment process - Google Patents
Threonine fermentation tail gas environment-friendly treatment process Download PDFInfo
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- B01D53/34—Chemical or biological purification of waste gases
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Abstract
The invention belongs to the technical field of biology, and discloses an environment-friendly treatment process for threonine fermentation tail gas, which comprises the following steps: step 1) preparing an adsorption carrier, step 2) preparing a compound bacterial liquid, step 3) preparing a biochemical adsorbent, and step 4) treating tail gas. The process can quickly and conveniently adsorb and treat the threonine fermentation tail gas.
Description
Technical Field
The invention belongs to the technical field of biology, and particularly relates to an environment-friendly treatment process for threonine fermentation tail gas.
Background
During the process of preparing amino acid by fermentation, a large amount of tail gas is generated, which is mainly boiler tail gas. Boiler tail gas is mainly a mixture of gas and smoke dust, and is a main reason for polluting atmosphere in residential areas. The components of the flue gas are complex, the gas comprises water vapor, sulfur dioxide, hydrocarbons, nitrogen oxides and the like, and the smoke dust comprises ash, coal particles, oil drops, high-temperature cracking products and the like of the fuel. Therefore, the pollution of the flue gas to the environment is the composite pollution of various poisons. The hazard of smoke to human bodies is related to the size of particles, most of which are fly ash with the diameter less than 10 microns, and particularly the fly ash with the diameter of 1-2.5 microns is the most harmful to human bodies.
CN104722165A discloses an environmental protection technology for purifying amino acid production tail gas, which comprises dust removal, demisting, desulfurization and denitration, and fertilizer preparation, and combines chemical agents and microbial technologies, thereby effectively purifying the amino acid production tail gas, realizing waste recycling, saving energy and protecting environment.
CN 105999951A discloses a treatment method for cooling, deodorizing, desulfurizing and denitrifying spraying granulation tail gas, which comprises the following steps: the tail gas of the spraying granulation 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.
On the basis of the work, the applicant continuously optimizes the treatment process, and aims to reduce the cost and improve the efficiency.
Disclosure of Invention
The invention is realized by the following technical scheme.
The threonine fermentation tail gas environment-friendly treatment process comprises the following steps: step 1) preparing an adsorption carrier, step 2) preparing a compound bacterial liquid, step 3) preparing a biochemical adsorbent, and step 4) treating tail gas.
Further, the treatment process comprises the following steps:
step 1) preparation of an adsorption carrier: taking 1000mL of water to slowly dissolve 500g of glucose, adding 500g of attapulgite after the glucose is fully dissolved, fully soaking in a water bath kettle at 50 ℃ for 10 hours, casting the paste on a flat plate, drying in an oven at 100 ℃ for 20 hours, grinding and sieving by a 200-mesh sieve to obtain the attapulgite-loaded glucose;
step 2) preparing a composite bacterial liquid: mixing the nitrosobacteria liquid, the paracoccus denitrifican liquid and the alcaligenes faecalis liquid according to the ratio of 2: 1: 1 to obtain a compound bacterial liquid;
step 3) preparing a biochemical adsorbent: uniformly mixing the composite bacterial liquid and the attapulgite loaded glucose, and drying at 30 ℃ until the water content is 10-20% to obtain a biochemical adsorbent;
step 4), tail gas treatment: the boiler tail gas generated in the threonine fermentation process is firstly sprayed, cooled and dedusted to reduce the temperature of the tail gas to below 35 ℃, and then demisted by an electric demister; and paving the biochemical adsorbent on the lower part of the inner wall of the pipeline, contacting the demisted tail gas with the biochemical adsorbent, and finally discharging the tail gas after complete reaction.
Further, the particle size of the attapulgite is 0.01-0.05 mm.
Further, the concentrations of the nitrosobacteria liquid, the paracoccus denitrifican liquid and the alcaligenes faecalis liquid are all controlled to be 1 × 1088-9cfu/ml。
Further, the composite bacterial liquid and the attapulgite-loaded glucose are mixed according to a ratio of 1L: mixing at a ratio of 1-2 kg.
Specifically, the nitrosobacteria is CCTCC No: m2010002, wherein the paracoccus denitrifican is ATCC 13543, and the Alcaligenes faecalis is ATCC 31555.
The culture method of the strain in the above steps is not the innovation of the present invention, and will not be detailed herein, and those skilled in the art can select the conventional culture medium and the conventional method for expanding culture according to the literature or general knowledge in the field to make the viable count reach 108- 9cfu/ml order of magnitude; the strain can be purchased from CCTCC, ATCC and other commercial sources.
The beneficial effects of the invention mainly comprise the following aspects:
the attapulgite can adsorb tail gas pollutants, mainly adopts physical adsorption and assists chemical adsorption, but has limited adsorption capacity, needs to be replaced immediately after being saturated, has high replacement frequency, is inconvenient to use and increases the cost; because the surface of the attapulgite has no dispersed particles, the invention adopts glucose solution to modify the attapulgite, and glucose is loaded, so that uneven attachments solidified due to viscous glucose loading appear on the particle surface, thereby increasing the specific surface area of the attapulgite; glucose molecules are intercalated into the attapulgite to increase the pore volume, and the glucose molecules can also be used as a microbial organic carbon source, so that the low activity or death of microorganisms caused by the lack of carbon source nutrient components in the environment is avoided. The three microorganisms can be symbiotic and can be attached to the carrier, and after the carrier adsorbs the pollutants, the microorganisms can grow by taking the pollutants as main nutrients, so that the pollutants are thoroughly degraded, and the method is environment-friendly and pollution-free.
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
The process for treating the threonine fermentation tail gas in an environment-friendly way comprises the following steps:
preparing an adsorption carrier: taking 1000mL of water to slowly dissolve 500g of glucose, adding 500g of attapulgite (the particle size is 0.01 mm) after the glucose is fully dissolved, fully soaking in a 50 ℃ water bath for 10h, casting the paste on a flat plate, drying in an oven at 100 ℃ for 20h, grinding and sieving with a 200-mesh sieve to obtain the attapulgite-loaded glucose; specific surface area 297.4m2The volume of the total pores is 12.6ml/g, which is respectively 43 percent and 85 percent higher than that of the original attapulgite.
Respectively obtaining nitrosobacteria liquid, paracoccus denitrifican liquid and alcaligenes faecalis liquid according to conventional culture, wherein the concentration is controlled to be 1 × 109cfu/ml; nitrosation bacterial liquid, paracoccus denitrifican liquid and excrementThe alcaligenes liquid was prepared as follows 2: 1: 1 to obtain a compound bacterial liquid;
the nitrosobacteria is specifically nitrosobacteria (A)Nitrosomonas europaea) CCTCC No: m2010002; the Paracoccus denitrificans can be Paracoccus denitrificans (Paracoccus Denitrificans) ATCC 13543; the Alcaligenes faecalis (Alcaligenes faecalis) is Alcaligenes faecalis ATCC 31555.
And (3) mixing the composite bacterial liquid and the adsorption carrier according to the proportion of 1L: 2kg of the mixture is uniformly mixed, and the mixture is dried at the temperature of 30 ℃ until the water content is 15 percent, so that the biochemical adsorbent is obtained;
the boiler tail gas generated in the threonine fermentation process is firstly sprayed, cooled and dedusted to reduce the temperature of the tail gas to below 35 ℃, and then demisted by an electric demister; spreading biochemical adsorbent at the lower part of the inner wall of the pipeline with a thickness of 10cm, contacting the demisted tail gas with the biochemical adsorbent for 30min at an airspeed of 5000h-1And exhausting tail gas.
Example 2
The process for treating the threonine fermentation tail gas in an environment-friendly way comprises the following steps:
preparing an adsorption carrier: slowly dissolving 50g of glucose in 100mL of water, adding 50g of attapulgite (the particle size is 0.03 mm) after the glucose is fully dissolved, fully soaking in a 50 ℃ water bath for 10h, casting the paste on a flat plate, drying in an oven at 100 ℃ for 20h, grinding and sieving with a 200-mesh sieve to obtain attapulgite-loaded glucose;
respectively obtaining nitrosobacteria liquid, paracoccus denitrifican liquid and alcaligenes faecalis liquid according to conventional culture, wherein the concentration is controlled to be 1 × 108cfu/ml; mixing the nitrosobacteria liquid, the paracoccus denitrifican liquid and the alcaligenes faecalis liquid according to the proportion of 1: 1: 1 to obtain a compound bacterial liquid;
and (3) mixing the composite bacterial liquid and the adsorption carrier according to the proportion of 1L: 1kg of the raw materials are uniformly mixed, and the mixture is dried at the temperature of 30 ℃ until the water content is 20 percent to obtain the biochemical adsorbent;
the boiler tail gas generated in the threonine fermentation process is firstly sprayed, cooled and dedusted to reduce the temperature of the tail gas to below 35 ℃, and then demisted by an electric demister; spreading the biochemical adsorbent at the lower part of the inner wall of the pipeline, wherein the thickness of the biochemical adsorbent is 10cm, contacting the demisted tail gas with the biochemical adsorbent for 60min, and discharging the tail gas.
Example 3
The tail gas purification effect test: the boiler tail gas generated in the preparation of threonine is selected and treated by the process of the embodiment 1, and the unit of each pollutant is mg/Nm3. Control group 1: the process is the same as example 1 except that the adsorption carrier is attapulgite and is not modified; control group 2: the adsorption carrier was diatomite, and the rest of the procedure was the same as in example 1. Specific results are shown in table 1:
TABLE 1
| NOx | SO2 | |
| Before treatment | 546 | 985 |
| Example 1 | 41 | 78 |
| Control group 1 | 127 | 204 |
| Control group 2 | 173 | 196 |
As shown in Table 1, compared with the control group 1-2, the adsorption carrier of the present invention has better adsorption removal effect on the pollutants after being modified.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (6)
1. The threonine fermentation tail gas environment-friendly treatment process comprises the following steps: step 1) preparing an adsorption carrier, step 2) preparing a compound bacterial liquid, step 3) preparing a biochemical adsorbent, and step 4) treating tail gas.
2. An abatement process according to claim 1, comprising the steps of:
step 1) preparation of an adsorption carrier: taking 1000mL of water to slowly dissolve 500g of glucose, adding 500g of attapulgite after the glucose is fully dissolved, fully soaking in a water bath kettle at 50 ℃ for 10 hours, casting the paste on a flat plate, drying in an oven at 100 ℃ for 20 hours, grinding and sieving by a 200-mesh sieve to obtain the attapulgite-loaded glucose;
step 2) preparing a composite bacterial liquid: mixing the nitrosobacteria liquid, the paracoccus denitrifican liquid and the alcaligenes faecalis liquid according to the ratio of 2: 1: 1 to obtain a compound bacterial liquid;
step 3) preparing a biochemical adsorbent: uniformly mixing the composite bacterial liquid and the attapulgite loaded glucose, and drying at 30 ℃ until the water content is 10-20% to obtain a biochemical adsorbent;
step 4), tail gas treatment: the boiler tail gas generated in the threonine fermentation process is firstly sprayed, cooled and dedusted to reduce the temperature of the tail gas to below 35 ℃, and then demisted by an electric demister; and paving the biochemical adsorbent on the lower part of the inner wall of the pipeline, contacting the demisted tail gas with the biochemical adsorbent, and finally discharging the tail gas after complete reaction.
3. A treatment process according to claim 2, wherein the attapulgite clay has a particle size of 0.01 to 0.05 mm.
4. The treatment process according to claim 2, wherein the concentrations of the nitrosobacteria liquid, the paracoccus denitrifican liquid and the alcaligenes faecalis liquid are all controlled to be 1 × 1088-9cfu/ml。
5. The treatment process according to claim 2, wherein the composite bacterial liquid and the attapulgite-loaded glucose are mixed according to a ratio of 1L: mixing at a ratio of 1-2 kg.
6. A treatment process according to claim 2, wherein the nitrosobacteria is CCTCC No: m2010002, wherein the paracoccus denitrifican is ATCC 13543, and the Alcaligenes faecalis is ATCC 31555.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110499262A (en) * | 2018-05-17 | 2019-11-26 | 卢松 | Purification absorbs the compound of slurry-spraying pelletizing flue gas |
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| KR102016146B1 (en) * | 2019-07-10 | 2019-10-23 | 한국환경평가기술 주식회사 | The manufacturing method of composition for bio filter for improving air pollution by removing odour and organic volatile compounds |
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- 2020-05-21 CN CN202010434610.8A patent/CN111569640A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101492165A (en) * | 2009-03-09 | 2009-07-29 | 合肥工业大学 | Organic modification method for attapulgite stone and uses of organic modified attapulgite stone |
| CN104383809A (en) * | 2014-10-27 | 2015-03-04 | 内蒙古阜丰生物科技有限公司 | Desulfurization and denitration technology for boiler flue gas |
| CN104692763A (en) * | 2015-02-09 | 2015-06-10 | 中山大学 | Cheap nutritional biological deodorization packing and preparation method thereof |
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| CN110499262A (en) * | 2018-05-17 | 2019-11-26 | 卢松 | Purification absorbs the compound of slurry-spraying pelletizing flue gas |
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Application publication date: 20200825 |