CN114606274A - Method for producing carboxylic acid with high added value by utilizing synthesis gas to strengthen anaerobic fermentation of sludge - Google Patents
Method for producing carboxylic acid with high added value by utilizing synthesis gas to strengthen anaerobic fermentation of sludge Download PDFInfo
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- 239000010802 sludge Substances 0.000 title claims abstract description 81
- 238000000855 fermentation Methods 0.000 title claims abstract description 77
- 230000015572 biosynthetic process Effects 0.000 title claims abstract description 38
- 238000003786 synthesis reaction Methods 0.000 title claims abstract description 38
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 23
- 150000001732 carboxylic acid derivatives Chemical class 0.000 title claims abstract 14
- 230000004151 fermentation Effects 0.000 claims abstract description 41
- 239000003513 alkali Substances 0.000 claims abstract description 24
- 238000000034 method Methods 0.000 claims abstract description 14
- 239000007789 gas Substances 0.000 claims description 45
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 24
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 14
- 239000011521 glass Substances 0.000 claims description 9
- 238000005070 sampling Methods 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 239000002253 acid Substances 0.000 claims description 7
- 239000012452 mother liquor Substances 0.000 claims description 7
- 229910052757 nitrogen Inorganic materials 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 4
- 238000003756 stirring Methods 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 claims 2
- 238000002474 experimental method Methods 0.000 abstract description 11
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 8
- 229910052799 carbon Inorganic materials 0.000 abstract description 8
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 abstract description 6
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 abstract description 4
- 229910002092 carbon dioxide Inorganic materials 0.000 abstract description 3
- 239000001569 carbon dioxide Substances 0.000 abstract description 2
- 230000001133 acceleration Effects 0.000 abstract 1
- 238000006065 biodegradation reaction Methods 0.000 abstract 1
- 238000006243 chemical reaction Methods 0.000 abstract 1
- 239000003112 inhibitor Substances 0.000 abstract 1
- 230000002401 inhibitory effect Effects 0.000 abstract 1
- 238000005728 strengthening Methods 0.000 abstract 1
- 150000001735 carboxylic acids Chemical class 0.000 description 26
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 12
- 230000000052 comparative effect Effects 0.000 description 9
- XBDQKXXYIPTUBI-UHFFFAOYSA-N dimethylselenoniopropionate Natural products CCC(O)=O XBDQKXXYIPTUBI-UHFFFAOYSA-N 0.000 description 6
- 239000010865 sewage Substances 0.000 description 5
- 210000002421 cell wall Anatomy 0.000 description 4
- 230000009089 cytolysis Effects 0.000 description 4
- 230000007062 hydrolysis Effects 0.000 description 4
- 238000006460 hydrolysis reaction Methods 0.000 description 4
- 244000005700 microbiome Species 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 239000002699 waste material Substances 0.000 description 4
- OENIXTHWZWFYIV-UHFFFAOYSA-N 2-[4-[2-[5-(cyclopentylmethyl)-1h-imidazol-2-yl]ethyl]phenyl]benzoic acid Chemical compound OC(=O)C1=CC=CC=C1C(C=C1)=CC=C1CCC(N1)=NC=C1CC1CCCC1 OENIXTHWZWFYIV-UHFFFAOYSA-N 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- 239000011888 foil Substances 0.000 description 3
- 235000019260 propionic acid Nutrition 0.000 description 3
- IUVKMZGDUIUOCP-BTNSXGMBSA-N quinbolone Chemical compound O([C@H]1CC[C@H]2[C@H]3[C@@H]([C@]4(C=CC(=O)C=C4CC3)C)CC[C@@]21C)C1=CCCC1 IUVKMZGDUIUOCP-BTNSXGMBSA-N 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- FERIUCNNQQJTOY-UHFFFAOYSA-N Butyric acid Chemical compound CCCC(O)=O FERIUCNNQQJTOY-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000003403 homoacetogenic effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- XYHKNCXZYYTLRG-UHFFFAOYSA-N 1h-imidazole-2-carbaldehyde Chemical compound O=CC1=NC=CN1 XYHKNCXZYYTLRG-UHFFFAOYSA-N 0.000 description 1
- GWYFCOCPABKNJV-UHFFFAOYSA-M 3-Methylbutanoic acid Natural products CC(C)CC([O-])=O GWYFCOCPABKNJV-UHFFFAOYSA-M 0.000 description 1
- 241000894006 Bacteria Species 0.000 description 1
- 239000002028 Biomass Substances 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- GWYFCOCPABKNJV-UHFFFAOYSA-N beta-methyl-butyric acid Natural products CC(C)CC(O)=O GWYFCOCPABKNJV-UHFFFAOYSA-N 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000029087 digestion Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 150000002632 lipids Chemical class 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229920002521 macromolecule Polymers 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 239000010815 organic waste Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 102000004169 proteins and genes Human genes 0.000 description 1
- 108090000623 proteins and genes Proteins 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 235000000346 sugar Nutrition 0.000 description 1
- 150000008163 sugars Chemical class 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12P—FERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIRED CHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERS FROM A RACEMIC MIXTURE
- C12P7/00—Preparation of oxygen-containing organic compounds
- C12P7/40—Preparation of oxygen-containing organic compounds containing a carboxyl group including Peroxycarboxylic acids
- C12P7/54—Acetic acid
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/02—Biological treatment
- C02F11/04—Anaerobic treatment; Production of methane by such processes
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12P—FERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIRED CHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERS FROM A RACEMIC MIXTURE
- C12P7/00—Preparation of oxygen-containing organic compounds
- C12P7/40—Preparation of oxygen-containing organic compounds containing a carboxyl group including Peroxycarboxylic acids
- C12P7/52—Propionic acid; Butyric acids
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Abstract
The invention discloses a method for producing carboxylic acid with high added value by utilizing synthesis gas to strengthen anaerobic fermentation of excess sludge. The method aims to solve the outstanding problems of over-quick carbon emission acceleration, low carboxylic acid yield of anaerobic sludge fermentation, addition of an inhibitor for product (methane) competition and the like caused by consumption of fossil energy at present, and aims to realize synthesis of gas (CO)2、CO、H2) The carboxylic acid with high added value is produced by strengthening the medium-temperature alkaline fermentation of the excess sludge and is CO2The reduction provides a conversion path while increasing the rate of sludge biodegradation and inhibiting methane production. The method comprises the following steps: firstly, performing hot alkali pretreatment on excess sludge; secondly, assembling an anaerobic fermentation device; thirdly, adding sludge and introducing synthesis gas; fourthly, carrying out an experiment of producing carboxylic acid by sludge fermentation under an anaerobic condition. The invention takes synthesis gas asThe added carbon source for anaerobic fermentation of the sludge reduces the carbon dioxide emission and improves the yield of the carboxylic acid with high added value, so that the method is a green and efficient method for producing the carboxylic acid with high added value.
Description
Technical Field
The invention relates to a sewage treatment technology, in particular to a method for producing carboxylic acid with high added value by utilizing synthesis gas to strengthen anaerobic fermentation of sludge.
Background
With the rapid development of the sewage treatment industry technology, effective sludge treatment, especially the implementation of renewable technology, is very important for the resource utilization of sludge. Although WAS is considered a low grade biomass, it contains a large amount of organic matter (macromolecules such as proteins, sugars, lipids, etc.) and can produce approximately 150 kWh/PE/year of energy (PE: population equivalent). Therefore, a process of recovering high value-added bio-energy and bio-resources from WAS has been widely spotlighted. Due to the low value of anaerobic digestion products and the characteristics of greenhouse gases, the research on the production of high value-added carboxylic acids (mainly C2-C5 carboxylic acids) by WAS anaerobic fermentation has been turned to recently. During fermentation, chemicals are added to suppress the production of methane, so the WAS can be efficiently converted to carboxylic acid.
In addition, a large amount of carbon emission is generated in the sewage treatment process, statistics shows that the carbon emission caused by a sewage treatment plant reaches 1% -2% of the carbon emission of the whole society, and how to effectively reduce the emission becomes a very key problem guide.
Disclosure of Invention
The invention aims to strengthen the process of producing carboxylic acid by anaerobic fermentation of sludge by using synthesis gas and overcome the defects of low product yield, poor continuous operation effect and the like in the traditional anaerobic fermentation process.
The method for producing the carboxylic acid with the high added value by utilizing the synthesis gas to strengthen the anaerobic fermentation of the sludge specifically comprises the following steps:
firstly, hot alkali pretreatment of excess sludge: the low hydrolysis rate of the sludge is one of the main speed-limiting steps of anaerobic fermentation of the sludge, so that a hot alkali pretreatment mode is adopted to destroy sludge flocs and cell walls of microorganisms, improve the lysis rate of the sludge and accelerate the anaerobic fermentation process; firstly, 1L of excess sludge is taken out by a beaker, high-concentration NaOH mother liquor is dripped and continuously stirred by a glass rod, the pH is adjusted to be 12 +/-1, and then the mixture is heated in a water bath kettle at 85-90 ℃ for 60-70min and then cooled to room temperature for standby.
Secondly, assembling an anaerobic fermentation device: a fermentation bottle is used as a reactor, a sampling pipe and a vent pipe (connected with an air bag for storing gas) are arranged, the fermentation bottle is made of glass, and the whole reactor is in a sealed anaerobic environment during operation.
Thirdly, adding sludge and introducing synthesis gas: mixing raw sludge and hot alkali pretreatment sludge according to a volume ratio of 1:9, adding the mixture into a reactor, screwing a cover, introducing nitrogen to ensure an anaerobic environment after verifying the air tightness, and then storing and taking synthetic gas (CO) by using an aluminum foil air bag2：CO：H2) Gas, connected to a sampling tube, was slowly passed into the reactor, the entire process being under strictly anaerobic conditions.
Fourthly, carrying out sludge fermentation under anaerobic conditions to produce carboxylic acid: the fermentation bottle is placed in a shaking table under the conditions of 37 +/-1 ℃ and 120 +/-10 rpm, and the anaerobic fermentation acid production process is carried out.
Synthesis gas (CO)2、CO、H2) Can be obtained by gasifying refractory substances at high temperature, and the fermentation process of the synthesis gas is considered to be a promising technology, compared with the traditional chemical method (F-T synthesis) for synthesizing liquid fuel, the method has the advantages of mild conditions, high product yield and the like. The carboxylic acid is produced by enhancing the WAS anaerobic fermentation of the synthesis gas, so that a new way is provided for treating and disposing the solid organic waste on one hand, and a new insight is provided for carbon emission reduction through the fermentation process of the synthesis gas on the other hand.
The invention has the following beneficial results: according to the invention, the synthesis gas is adopted to strengthen the anaerobic fermentation of the excess sludge to produce the carboxylic acid, the yield of the carboxylic acid is obviously improved by adding the external carbon source, and meanwhile, the carbon dioxide and the hydrogen are converted into the short-chain carboxylic acid through homoacetogenic bacteria, so that the carbon emission is reduced.
Drawings
FIG. 1 is a graph of carboxylic acid concentration versus treatment time during runs of examples and comparative experiments one, two, and three.
FIG. 2 shows the distribution of carboxylic acid components at the fourth day of the run for the first, second and third examples and comparative experiments.
Detailed Description
The technical solution of the present invention is not limited to the specific embodiments listed below, and includes any combination of the specific embodiments.
Firstly, hot alkali pretreatment of excess sludge: the low hydrolysis rate of the sludge is one of the main speed-limiting steps of anaerobic fermentation of the sludge, so a hot alkali pretreatment mode is adopted to destroy sludge flocs and cell walls of microorganisms, improve the lysis rate of the sludge and accelerate the anaerobic fermentation process; first, 1L of excess sludge was taken out with a beaker, and a high concentration NaOH mother liquor (1 g/ml) was added dropwise with continuous stirring with a glass rod, adjusted to pH =12, and then heated in a water bath at 85 ℃ for 60min, followed by cooling to room temperature for use.
Secondly, assembling an anaerobic fermentation device: a fermentation bottle is used as a reactor, a sampling pipe and a vent pipe (connected with a 1L air bag for storing gas) are installed, the volume of the fermentation bottle is 500ml, the material of the fermentation bottle is glass, and the whole reactor is in a sealed anaerobic environment during operation.
Thirdly, adding sludge and introducing synthesis gas: adding raw sludge and hot alkali pretreated sludge into a reactor, screwing down a cover, introducing nitrogen to ensure an anaerobic environment after verifying the air tightness, and then storing and taking 1L of synthetic gas (CO) by using an aluminum foil air bag2：CO：H2) Gas, connected to a sampling tube, was slowly passed into the reactor, the entire process being under strictly anaerobic conditions.
Fourthly, carrying out sludge fermentation under anaerobic conditions to produce carboxylic acid: the fermentation bottle is placed in a shaking table under the conditions of 37 ℃ and 120rpm, and the anaerobic fermentation acid production process is carried out.
The second embodiment is as follows: the first difference between the present embodiment and the specific embodiment is: in step one, excess sludge of different volumes can be used. The rest is the same as the first embodiment.
The third concrete implementation mode: the difference between this embodiment and one of the first to second embodiments is: NaOH mother liquor with different concentrations can be adopted in the first step. The rest is the same as the first embodiment.
The fourth concrete implementation mode: the difference between this embodiment mode and one of the first to third embodiment modes is: the sludge in the step one can be heated in a water bath kettle at 85-90 ℃ for 60min after the alkali treatment. The rest is the same as the first embodiment.
The fifth concrete implementation mode: the difference between this embodiment and one of the first to fourth embodiments is: in the first step, the mixture can be heated in a water bath kettle at 85 ℃ for 60-70 min. The rest is the same as the first embodiment.
The sixth specific implementation mode: the difference between this embodiment and one of the first to fifth embodiments is: in the second step, a fermentation bottle with the volume of 500-1000ml can be used. The rest is the same as the first embodiment.
The seventh embodiment: the difference between this embodiment and one of the first to sixth embodiments is: the volume of the synthesis gas introduced in the third step is 500-1000ml, and the rest is the same as that in the first embodiment.
The specific implementation mode is eight: the present embodiment differs from one of the first to seventh embodiments in that: the beneficial effects of the invention are verified by adopting the following examples and comparative experiments:
example one (tappas _ syngas):
the method for producing the carboxylic acid with the high added value by adopting the synthesis gas to strengthen the anaerobic fermentation of the sludge is specifically carried out according to the following steps:
firstly, hot alkali pretreatment of excess sludge: the low hydrolysis rate of the sludge is one of the main speed-limiting steps of anaerobic fermentation of the sludge, so a hot alkali pretreatment mode is adopted to destroy sludge flocs and cell walls of microorganisms, improve the lysis rate of the sludge and accelerate the anaerobic fermentation process; first, 1L of excess sludge was taken out with a beaker, and a high concentration NaOH mother liquor (1 g/ml) was added dropwise with continuous stirring with a glass rod, adjusted to pH =12, and then heated in a water bath at 85 ℃ for 60min, followed by cooling to room temperature for use.
Secondly, assembling an anaerobic fermentation device: a fermentation bottle is used as a reactor, a sampling pipe and a vent pipe (connected with a 1L air bag for storing gas) are installed, the volume of the fermentation bottle is 500ml, the fermentation bottle is made of glass, and the whole reactor is in a sealed anaerobic environment during operation.
Thirdly, adding sludge and introducing synthesis gas: adding raw sludge and hot alkali pretreated sludge into a reactor, screwing down a cover, introducing nitrogen to ensure an anaerobic environment after verifying the air tightness, and then storing and taking 1L of synthetic gas (CO) by using an aluminum foil air bag2：CO：H2) Gas, connected to a sampling tube, was slowly passed into the reactor, the entire process being under strictly anaerobic conditions.
Fourthly, carrying out sludge fermentation under anaerobic conditions to produce carboxylic acid: the fermentation bottle is placed in a shaking table under the conditions of 37 ℃ and 120rpm, and the anaerobic fermentation acid production process is carried out.
Comparative experiment one (tappas):
the method for producing the carboxylic acid with high added value without carrying out synthesis gas reinforced sludge anaerobic fermentation is specifically completed according to the following steps:
firstly, hot alkali pretreatment of excess sludge: the low hydrolysis rate of the sludge is one of the main speed-limiting steps of anaerobic fermentation of the sludge, so a hot alkali pretreatment mode is adopted to destroy sludge flocs and cell walls of microorganisms, improve the lysis rate of the sludge and accelerate the anaerobic fermentation process; first, 1L of excess sludge was taken out with a beaker, and a high concentration NaOH mother liquor (1 g/ml) was added dropwise with continuous stirring with a glass rod, adjusted to pH =12, and then heated in a water bath at 85 ℃ for 60min, followed by cooling to room temperature for use.
Secondly, assembling an anaerobic fermentation device: a fermentation bottle is used as a reactor, a sampling pipe and a vent pipe (connected with a 1L air bag for storing gas) are installed, the volume of the fermentation bottle is 500ml, the material of the fermentation bottle is glass, and the whole reactor is in a sealed anaerobic environment during operation.
Thirdly, adding sludge and introducing nitrogen: adding raw sludge and hot alkali pretreatment sludge into a reactor, screwing down a cover, and introducing nitrogen to ensure an anaerobic environment after verifying the air tightness.
Fourthly, carrying out sludge fermentation under anaerobic conditions to produce carboxylic acid: the fermentation bottle is placed in a shaking table under the conditions of 37 ℃ and 120rpm, and the anaerobic fermentation acid production process is carried out.
Comparative experiment two (WAS)
The sludge is not subjected to thermal alkali pretreatment, synthesis gas is not introduced, the anaerobic fermentation acid production process is directly carried out by introducing nitrogen into the reactor which is the same as that in the first comparative experiment, and the condition setting is the same as that in the fourth comparative experiment.
Comparison experiment three (WAS _ syngas)
The experimental process adopts the second, third and fourth steps of the first embodiment, the step of hot alkali pretreatment is not needed, and meanwhile, the residual sludge of a sewage treatment plant is directly selected in the third step, and the synthesis gas is introduced.
FIG. 1 is a graph of carboxylic acid concentration versus treatment time during runs of examples and comparative experiments one, two, and three. The figure shows that the yield of carboxylic acid in anaerobic fermentation of sludge is obviously increased after the synthesis gas is added, wherein the maximum hot alkali pretreatment group for introducing the synthesis gas reaches 11069.28 mg/L, which is 1.70 times of that of the hot alkali pretreatment group, and is 4.66 times of that of a pure anaerobic fermentation process. This indicates that the syngas is effective in promoting anaerobic fermentation of sludge to produce carboxylic acids. In the figure, WAS represents an anaerobic fermentation process of waste activated sludge without thermal alkali pretreatment, tappas represents an anaerobic fermentation process of waste activated sludge with thermal alkali pretreatment, WAS _ syngas represents an anaerobic fermentation process of waste activated sludge without thermal alkali pretreatment by introducing syngas, and tappas _ syngas represents an anaerobic fermentation process of waste activated sludge with thermal alkali pretreatment by introducing syngas.
FIG. 2 shows the distribution of carboxylic acid components on the fourth day of the run for the first, second and third examples and comparative experiments. From the figure it can be seen that the main products of anaerobic fermentation are acetic acid and propionic acid, and that the addition of synthesis gas causes a change in the carboxylic acid composition, wherein the hot base pretreatment group fed with synthesis gas has an acetic acid content of 83.59% of the total carboxylic acid, followed by propionic acid 7.47%, isovaleric acid 3.20% and n-butyric acid 2.67%. After the synthesis gas is added, the ratio of the small molecular acid (acetic acid and propionic acid) is improved by 7.6-12.3% compared with other experimental groups. This indicates that syngas can alter the distribution of carboxylic acids, utilizing CO via the homoacetogenic process2And H2The enrichment of acetic acid is enhanced.
Claims (6)
1. A method for producing carboxylic acid with high added value by utilizing synthesis gas to strengthen anaerobic fermentation of sludge is characterized by comprising the following steps:
firstly, hot alkali pretreatment of excess sludge: firstly, taking a certain amount of residual sludge, dropwise adding high-concentration NaOH mother liquor, continuously stirring by using a glass rod, adjusting the pH to be 12 +/-1, then heating in a water bath kettle at the temperature of 85-90 ℃ for 60-70min, and then cooling to room temperature for later use;
secondly, assembling an anaerobic fermentation device: a fermentation bottle is adopted as a reactor, a sampling pipe and a vent pipe are installed, and the whole reactor is in a sealed anaerobic environment during operation;
thirdly, adding sludge and introducing synthesis gas: adding raw sludge and hot alkali pretreatment sludge into a reactor according to the volume ratio of 1:9, screwing a cover, introducing nitrogen to ensure an anaerobic environment after verifying the air tightness, then storing and taking synthetic gas by using an air bag, connecting the gas bag to a sampling pipe, slowly introducing the gas into the reactor, and keeping the whole process under strict anaerobic conditions; the synthesis gas being CO2：CO：H2Mixing;
fourthly, carrying out sludge fermentation under anaerobic conditions to produce carboxylic acid: the fermentation bottle is placed in a shaking table under the conditions of 37 +/-1 ℃ and 120 +/-10 rpm, and the anaerobic fermentation acid production process is carried out.
2. The method for producing high added-value carboxylic acid by utilizing synthesis gas to enhance anaerobic fermentation of sludge according to claim 1, wherein NaOH is used for adjusting the pH of the sludge to be =12 in the first step, and the concentration of NaOH mother liquor is 1 g/ml.
3. The method for producing carboxylic acid with high added value by utilizing anaerobic fermentation of synthesis gas enhanced sludge as claimed in claim 1, wherein in step one, heating is carried out in water bath at 85 ℃ for 60 min.
4. The method for producing carboxylic acid with high added value by utilizing synthesis gas to reinforce anaerobic fermentation of sludge according to claim 1, wherein the volume ratio of the synthesis gas in the third step is CO: h2：CO2=4：4：2。
5. The method for producing carboxylic acid with high added value by utilizing synthesis gas to reinforce anaerobic fermentation of sludge according to claim 1, wherein the volume of the fermentation bottle in the second step is 500ml, and the volume of the synthesis gas introduced in the third step is 1L.
6. The method for producing high added-value carboxylic acid by utilizing synthesis gas enhanced anaerobic sludge fermentation according to claim 1, wherein the condition in step 4 is set to 37 ± 1 ℃ and the rotation speed is 120 rpm.
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|---|---|---|---|---|
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|---|---|---|---|---|
| US5269929A (en) * | 1988-05-13 | 1993-12-14 | Abb Environmental Services Inc. | Microbial process for the reduction of sulfur dioxide |
| CN103172242A (en) * | 2013-03-04 | 2013-06-26 | 同济大学 | Method for improving methanogenesis of residual sludge by heat and alkali combined pretreatment |
| CN107142288A (en) * | 2017-07-11 | 2017-09-08 | 江南大学 | The method of mixed bacterial fermentation synthesis gas production acetic acid and octanoic acid |
| CN107265806A (en) * | 2017-08-07 | 2017-10-20 | 深圳市海源能源科技有限公司 | A kind of excess sludge handling process based on carbon source reuse |
| CN110396528A (en) * | 2019-07-30 | 2019-11-01 | 山东众森固废资源循环利用研究院有限公司 | A kind of method of sludge anaerobic microbe conversion synthesis gas beam system acetic acid |
Non-Patent Citations (1)
| Title |
|---|
| 彭晶等: "热碱预处理对剩余污泥发酵产酸效能提升的影响", 《哈尔滨工业大学学报》, vol. 44, no. 8, 31 December 2012 (2012-12-31), pages 43 - 47 * |
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