CN113604510A - Method for improving efficiency of methane production through hydrothermal carbon enhanced anaerobic digestion - Google Patents
Method for improving efficiency of methane production through hydrothermal carbon enhanced anaerobic digestion Download PDFInfo
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- CN113604510A CN113604510A CN202110782085.3A CN202110782085A CN113604510A CN 113604510 A CN113604510 A CN 113604510A CN 202110782085 A CN202110782085 A CN 202110782085A CN 113604510 A CN113604510 A CN 113604510A
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 48
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 46
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 46
- 230000029087 digestion Effects 0.000 title claims abstract description 30
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000000498 ball milling Methods 0.000 claims abstract description 19
- 239000010815 organic waste Substances 0.000 claims abstract description 12
- 239000002028 Biomass Substances 0.000 claims abstract description 9
- 239000002351 wastewater Substances 0.000 claims abstract description 3
- 239000002699 waste material Substances 0.000 claims description 9
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 claims description 6
- 238000001027 hydrothermal synthesis Methods 0.000 claims description 5
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 4
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 claims description 4
- 240000008042 Zea mays Species 0.000 claims description 4
- 235000005824 Zea mays ssp. parviglumis Nutrition 0.000 claims description 4
- 235000002017 Zea mays subsp mays Nutrition 0.000 claims description 4
- 235000005822 corn Nutrition 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 4
- 239000003960 organic solvent Substances 0.000 claims description 4
- 238000005406 washing Methods 0.000 claims description 4
- 239000010802 sludge Substances 0.000 claims description 3
- 241000195493 Cryptophyta Species 0.000 claims description 2
- 230000035484 reaction time Effects 0.000 claims description 2
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 claims description 2
- 239000010907 stover Substances 0.000 claims 1
- 238000006243 chemical reaction Methods 0.000 abstract description 4
- 238000012986 modification Methods 0.000 abstract description 4
- 230000004048 modification Effects 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000004064 recycling Methods 0.000 abstract description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 9
- 239000007789 gas Substances 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 239000003610 charcoal Substances 0.000 description 4
- 238000000855 fermentation Methods 0.000 description 4
- 230000001186 cumulative effect Effects 0.000 description 3
- 239000010902 straw Substances 0.000 description 3
- WQZGKKKJIJFFOK-GASJEMHNSA-N Glucose Natural products OC[C@H]1OC(O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-GASJEMHNSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000002708 enhancing effect Effects 0.000 description 2
- 230000004151 fermentation Effects 0.000 description 2
- 125000000524 functional group Chemical group 0.000 description 2
- 239000008103 glucose Substances 0.000 description 2
- 244000005700 microbiome Species 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 150000007524 organic acids Chemical class 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 230000027756 respiratory electron transport chain Effects 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 239000012075 bio-oil Substances 0.000 description 1
- 239000007810 chemical reaction solvent Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000010806 kitchen waste Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 235000005985 organic acids Nutrition 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000012265 solid product Substances 0.000 description 1
- 239000000126 substance Substances 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
- C12P5/00—Preparation of hydrocarbons or halogenated hydrocarbons
- C12P5/02—Preparation of hydrocarbons or halogenated hydrocarbons acyclic
- C12P5/023—Methane
-
- 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
- C12P2201/00—Pretreatment of cellulosic or lignocellulosic material for subsequent enzymatic treatment or hydrolysis
-
- 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
- C12P2203/00—Fermentation products obtained from optionally pretreated or hydrolyzed cellulosic or lignocellulosic material as the carbon source
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
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- Organic Chemistry (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Zoology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Microbiology (AREA)
- General Chemical & Material Sciences (AREA)
- Biotechnology (AREA)
- Health & Medical Sciences (AREA)
- Biochemistry (AREA)
- Bioinformatics & Cheminformatics (AREA)
- General Engineering & Computer Science (AREA)
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Abstract
The invention provides a method for improving the efficiency of methane production by hydrothermal carbon enhanced anaerobic digestion. The ball milling modification treatment is carried out on the hydrothermal carbon, so that the efficiency of methane production by hydrothermal carbon enhanced anaerobic digestion can be improved, and the methane production rate of an experimental group added with the ball milling modified hydrothermal carbon is 12.5% higher than that of an experimental group added with unmodified hydrothermal carbon, and reaches 3.44 times of that of a control group without the hydrothermal carbon. The method specifically comprises the steps of preparing hydrothermal carbon from biomass through hydrothermal conversion, further performing ball milling modification on the hydrothermal carbon, and then adding the hydrothermal carbon into an organic waste/wastewater anaerobic digestion methane production reactor to remarkably improve the methane production rate. The method can effectively improve the methane production rate of the anaerobic digestion reactor, improve the stability of the anaerobic digestion reactor, and is beneficial to more effectively reducing and recycling organic wastes.
Description
Technical Field
The invention belongs to the technical field of organic waste resource utilization, and particularly relates to a method for improving the efficiency of methane production by anaerobic digestion of organic wastes.
Background
With the acceleration of the urbanization process in China, the production amount of urban waste is rapidly increased, wherein the organic waste comprises kitchen waste, excrement, excess sludge generated in the sewage treatment process and the like. Anaerobic Digestion (AD) is an ideal organic waste treatment method that can not only reduce the amount of organic waste but also generate methane. However, the anaerobic reactor cannot achieve stable operation due to accumulation of volatile organic acids (VFA) caused by instability of the feeding amount and feeding property. The improvement of the anaerobic digestion rate and the stability has important significance for the effective treatment of organic wastes.
Hydrothermal char (hydrochar) is a solid product produced by the hydrothermal reaction of biomass waste (document Soil Research, 2010, 48: 618-. The hydrothermal conversion Process is generally a Process for obtaining bio-oil, chemicals and hydrothermal char by liquefying organic matter with water as a reaction solvent under subcritical conditions (temperature: 220-. It has been reported that hydrothermal carbon can promote direct electron transfer (DIET) in anaerobic digestion systems to enhance anaerobic digestion and increase methane production rate (Environmental science & technology, 2020: 5755-. The ball milling can increase the specific surface area of the hydrothermal carbon and increase the contact surface of the oxygen-containing functional groups of the hydrothermal carbon (the document ACS Sustainable Chemistry & Engineering, 2017: 9568-. However, no studies have been made on the ball milling of hydrothermal carbon to improve its ability to promote anaerobic digestion.
According to the invention, the hydrothermal carbon to be added into the anaerobic digestion reactor is subjected to ball milling treatment, so that the performance of enhancing anaerobic digestion is improved, the methane production speed is further accelerated, and the anaerobic digestion methane production system can run more stably.
Disclosure of Invention
The invention aims to provide a method for improving hydrothermal carbon reinforced anaerobic digestion efficiency, which increases the abundance of oxygen-containing functional groups exposed on the surface of hydrothermal carbon by ball milling the hydrothermal carbon, improves the capability of mediating direct electron transfer in an anaerobic digestion system, improves the methane production rate, and further improves the treatment efficiency of organic wastes.
The invention provides a method for improving hydrothermal carbon reinforced anaerobic digestion efficiency, which comprises the following specific steps:
(1) biomass waste is converted into hydrothermal carbon through hydrothermal reaction; washing away biological oil on the surface of the biomass waste by using an organic solvent, drying, and further performing ball milling treatment without other pretreatment steps;
(2) and (2) adding the ball-milling modified hydrothermal carbon obtained in the step (1) into a reactor for producing methane by utilizing anaerobic digestion of organic wastes/wastewater and the like, wherein the methane production rate is increased by over 12.5 percent compared with an experimental group added with non-ball-milling hydrothermal carbon.
In the invention, the biomass waste in the step (1) is any one of corn straw, sludge, algae and the like.
In the invention, the hydrothermal reaction temperature in the step (1) is 260 ℃ and 320 ℃, and the reaction time is 1-8 h.
In the present invention, the organic solvent in the step (1) is any one of alcohol, tetrahydrofuran, dichloromethane, or the like.
In the invention, the ball milling treatment time in the step (1) is 4-8 hours, and the rotating speed is 300-.
The invention has the beneficial effects that: according to the invention, the hydrothermal carbon is prepared by taking the biomass waste as the raw material, the hydrothermal carbon is subjected to ball milling, the ball-milled hydrothermal carbon has stronger capability of enhancing anaerobic digestion than the non-ball-milled hydrothermal carbon, and the reduction and the recycling of organic waste can be effectively realized.
Drawings
FIG. 1 illustrates the effect of hydrothermal carbon on anaerobic digestion to produce methane before and after ball milling;
figure 2 example 2 the cumulative methane production in the three reactors.
Detailed Description
The invention is described in more detail below with reference to examples and figures, but the scope of the invention is not limited to these.
Example 1:
(1) adding 300 g of corn straw powder and 2L of water into a 3L high-temperature high-pressure reaction kettle, reacting for 1 hour at 260 ℃ to prepare hydrothermal charcoal, washing soluble organic matters on the surface of the hydrothermal charcoal with alcohol, and drying;
(2) and putting the dried hydrothermal carbon into a planetary ball mill to perform ball milling for 8 hours at the rotating speed of 300 rpm.
(3) Three groups of anaerobic reactors are arranged, the volume of each reactor is 108 mL, 60 mL of glucose solution with the concentration of 4 g/L is filled, the same amount of microorganisms (F/M = 2) are inoculated, the initial pH value in the reactors is adjusted to be 7.5, no water heating carbon is added, 10 g/L of non-ball-milled water heating carbon is added, 10 g/L of ball-milled water heating carbon is added, after nitrogen is blown off to manufacture an anaerobic environment, the three groups of reactors are placed in a reactor at 37 ℃ for anaerobic fermentation, a sampling needle is used for taking a trace gas sample at regular time in the fermentation process, and a gas chromatograph is used for measuring the content of gas components. The cumulative methane production in the three reactors is shown in FIG. 1.
As can be seen from fig. 1, the ball-milled hydrothermal carbon promotes anaerobic digestion to produce methane more efficiently than the untreated hydrothermal carbon.
Example 2:
(1) adding 300 g of corn straw powder and 2L of water into a 3L high-temperature high-pressure reaction kettle, reacting for 8 hours at 260 ℃ to prepare hydrothermal charcoal, washing soluble organic matters on the surface of the hydrothermal charcoal with alcohol, and drying;
(2) and putting the dried hydrothermal carbon into a planetary ball mill to perform ball milling for 8 hours at the rotating speed of 300 rpm.
(3) Three groups of anaerobic reactors are arranged, the volume of each reactor is 108 mL, 60 mL of glucose solution with the concentration of 4 g/L is filled, the same amount of microorganisms (F/M = 2) are inoculated, the initial pH value in the reactors is adjusted to be 7.5, no water heating carbon is added, 10 g/L of non-ball-milled water heating carbon is added, 10 g/L of ball-milled water heating carbon is added, after nitrogen is blown off to manufacture an anaerobic environment, the three groups of reactors are placed in a reactor at 37 ℃ for anaerobic fermentation, a sampling needle is used for taking a trace gas sample at regular time in the fermentation process, and a gas chromatograph is used for measuring the content of gas components. The cumulative methane production in the three reactors is shown in FIG. 2.
As can be seen from fig. 2, the ball-milled hydrothermal carbon promoted the anaerobic digestion to produce methane more efficiently than the untreated hydrothermal carbon.
The embodiments described above are intended to facilitate the understanding and appreciation of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the embodiments described herein, and those skilled in the art should make improvements and modifications to the present invention based on the disclosure of the present invention within the protection scope of the present invention.
Claims (5)
1. A method for improving hydrothermal carbon reinforced anaerobic digestion efficiency is characterized by comprising the following specific steps:
(1) biomass waste is converted into hydrothermal carbon through hydrothermal reaction; washing away biological oil on the surface of the biomass waste by using an organic solvent, drying, and further performing ball milling treatment;
(2) and (2) adding the ball-milling modified hydrothermal carbon obtained in the step (1) into a reactor for producing methane by utilizing anaerobic digestion of organic wastes/wastewater and the like, wherein the methane production rate is increased by over 12.5 percent compared with an experimental group added with non-ball-milling hydrothermal carbon.
2. The method for improving hydrothermal char-enhanced anaerobic digestion efficiency as claimed in claim 1, wherein the biomass waste in step (1) is any one of corn stover, sludge or algae.
3. The method for improving hydrothermal carbon enhanced anaerobic digestion efficiency as claimed in claim 1, wherein the hydrothermal reaction temperature in step (1) is 260 ℃ to 320 ℃, and the reaction time is 1-6 h.
4. The method for improving hydrothermal char-enhanced anaerobic digestion efficiency according to claim 1, wherein the organic solvent in step (1) is any one of alcohol, tetrahydrofuran or dichloromethane.
5. The method for improving hydrothermal carbon enhanced anaerobic digestion efficiency as claimed in claim 1, wherein the ball milling treatment time in step (1) is 4-8 hours, and the rotation speed is 300-.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110782085.3A CN113604510A (en) | 2021-07-12 | 2021-07-12 | Method for improving efficiency of methane production through hydrothermal carbon enhanced anaerobic digestion |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114772722A (en) * | 2022-05-10 | 2022-07-22 | 华北电力大学（保定） | Method for improving anaerobic digestion performance of hydrothermal wastewater by utilizing homologous hydrothermal carbon |
| CN117228917A (en) * | 2023-10-25 | 2023-12-15 | 同济大学 | Method for realizing enrichment of methane-producing functional flora by anaerobic digestion through pretreatment-hydrothermal carbon regulation and control |
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| CN105905885A (en) * | 2016-04-27 | 2016-08-31 | 山东建筑大学 | Preparation method of straw-core carbon material |
| CN106834365A (en) * | 2017-02-20 | 2017-06-13 | 湖南大学 | A kind of utilization sludge substrate hydro-thermal charcoal promotes the method that sludge produces SCFA |
| CN111302340A (en) * | 2020-04-26 | 2020-06-19 | 南京工业大学 | Preparation method of biogas residue biochar |
| CN112479205A (en) * | 2020-12-23 | 2021-03-12 | 国际竹藤中心 | Narrow-pore bamboo sheath activated carbon and preparation method thereof |
-
2021
- 2021-07-12 CN CN202110782085.3A patent/CN113604510A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105905885A (en) * | 2016-04-27 | 2016-08-31 | 山东建筑大学 | Preparation method of straw-core carbon material |
| CN106834365A (en) * | 2017-02-20 | 2017-06-13 | 湖南大学 | A kind of utilization sludge substrate hydro-thermal charcoal promotes the method that sludge produces SCFA |
| CN111302340A (en) * | 2020-04-26 | 2020-06-19 | 南京工业大学 | Preparation method of biogas residue biochar |
| CN112479205A (en) * | 2020-12-23 | 2021-03-12 | 国际竹藤中心 | Narrow-pore bamboo sheath activated carbon and preparation method thereof |
Non-Patent Citations (2)
| Title |
|---|
| HONGHONG LYU等: "Ball-Milled Carbon Nanomaterials for Energy and Environmental Applications", ACS SUSTAINABLE CHEMISTRY & ENGINEERING * |
| SHUANG REN等: "Hydrochar-Facilitated Anaerobic Digestion: Evidence for Direct Interspecies Electron Transfer Mediated through Surface Oxygen- Containing Functional Groups", ENVIRONMENTAL SCIENCE & TECHNOLOGY * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114772722A (en) * | 2022-05-10 | 2022-07-22 | 华北电力大学（保定） | Method for improving anaerobic digestion performance of hydrothermal wastewater by utilizing homologous hydrothermal carbon |
| CN117228917A (en) * | 2023-10-25 | 2023-12-15 | 同济大学 | Method for realizing enrichment of methane-producing functional flora by anaerobic digestion through pretreatment-hydrothermal carbon regulation and control |
| CN117228917B (en) * | 2023-10-25 | 2024-02-09 | 同济大学 | Method for realizing enrichment of methane-producing functional flora by anaerobic digestion through pretreatment-hydrothermal carbon regulation and control |
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