CN112501215A - Biogas preparation method for kitchen waste treatment - Google Patents
Biogas preparation method for kitchen waste treatment Download PDFInfo
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- CN112501215A CN112501215A CN202011544585.5A CN202011544585A CN112501215A CN 112501215 A CN112501215 A CN 112501215A CN 202011544585 A CN202011544585 A CN 202011544585A CN 112501215 A CN112501215 A CN 112501215A
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- 239000010806 kitchen waste Substances 0.000 title claims abstract description 26
- 238000002360 preparation method Methods 0.000 title claims abstract description 8
- 239000010902 straw Substances 0.000 claims abstract description 35
- 238000000855 fermentation Methods 0.000 claims abstract description 34
- 239000007791 liquid phase Substances 0.000 claims abstract description 33
- 238000000034 method Methods 0.000 claims abstract description 31
- 238000002156 mixing Methods 0.000 claims abstract description 22
- 239000002253 acid Substances 0.000 claims abstract description 19
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000000463 material Substances 0.000 claims abstract description 15
- 239000000203 mixture Substances 0.000 claims abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 14
- 238000001125 extrusion Methods 0.000 claims abstract description 11
- 230000001007 puffing effect Effects 0.000 claims abstract description 10
- 238000004064 recycling Methods 0.000 claims abstract description 7
- 238000007599 discharging Methods 0.000 claims abstract description 6
- 230000004151 fermentation Effects 0.000 claims description 19
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 10
- 239000010813 municipal solid waste Substances 0.000 claims description 8
- 210000003608 fece Anatomy 0.000 claims description 7
- 238000012545 processing Methods 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 8
- 230000008901 benefit Effects 0.000 abstract description 4
- 239000000654 additive Substances 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 10
- 230000000694 effects Effects 0.000 description 3
- 235000013305 food Nutrition 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 208000028659 discharge Diseases 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000007858 starting material Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- DEXFNLNNUZKHNO-UHFFFAOYSA-N 6-[3-[4-[2-(2,3-dihydro-1H-inden-2-ylamino)pyrimidin-5-yl]piperidin-1-yl]-3-oxopropyl]-3H-1,3-benzoxazol-2-one Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)C1CCN(CC1)C(CCC1=CC2=C(NC(O2)=O)C=C1)=O DEXFNLNNUZKHNO-UHFFFAOYSA-N 0.000 description 1
- 241001465754 Metazoa Species 0.000 description 1
- 241001122767 Theaceae Species 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 210000000988 bone and bone Anatomy 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000029087 digestion Effects 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 210000003278 egg shell Anatomy 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 235000021190 leftovers Nutrition 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 235000013311 vegetables Nutrition 0.000 description 1
Classifications
-
- 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
- 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
-
- 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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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Zoology (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Wood Science & Technology (AREA)
- General Engineering & Computer Science (AREA)
- Biotechnology (AREA)
- Biochemistry (AREA)
- Bioinformatics & Cheminformatics (AREA)
- Microbiology (AREA)
- General Health & Medical Sciences (AREA)
- Genetics & Genomics (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Molecular Biology (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention relates to the technical field of biogas production, in particular to a biogas preparation method for kitchen waste treatment, which comprises the following steps: (1) mixing straws, water and acid, and performing extrusion puffing treatment to obtain a liquid-phase material; (2) mixing kitchen waste and excrement, and then mixing the mixture with the liquid-phase material; (3) carrying out anaerobic fermentation on the mixture obtained in the step (2) and discharging methane; (4) recycling at least part of the liquid phase obtained in the step (3) for use in the step (1); wherein the amount of liquid phase recycled for use in step (1) is 2-10% by weight relative to the straw. The method has the advantages of high yield of the obtained biogas, simplicity and no need of adding excessive additives.
Description
Technical Field
The invention relates to the technical field of biogas production, in particular to a biogas preparation method for kitchen waste treatment.
Background
The kitchen waste refers to waste generated in daily life and food processing, food service, unit catering and other activities of residents, and comprises abandoned vegetable leaves, leftovers, fruit peels, egg shells, tea leaves, bones and the like, and the main sources of the kitchen waste are household kitchens, restaurants, dining halls, markets and other industries related to food processing. The kitchen waste has high water content and large heat value, is not suitable for burning and is difficult to deal with, and currently, the kitchen waste treatment in China mainly adopts crushing direct discharge treatment and landfill treatment.
The crushing direct discharge treatment and the landfill treatment are effective treatment methods of the household garbage. However, both of the above methods cause secondary pollution to the environment, and some of the beneficial components contained in the kitchen waste are not effectively utilized.
At present, kitchen waste is used for preparing biogas, but the biogas yield is still to be further improved.
Disclosure of Invention
The invention aims to overcome the defect that the biogas yield is still to be further improved in the process of preparing biogas from kitchen waste in the prior art, and provides a biogas preparation method for treating kitchen waste.
In order to achieve the above object, the present invention provides a biogas preparation method for kitchen waste treatment, the method comprising the steps of:
(1) mixing straws, water and acid, and performing extrusion puffing treatment to obtain a liquid-phase material;
(2) mixing kitchen waste and excrement, and then mixing the mixture with the liquid-phase material;
(3) carrying out anaerobic fermentation on the mixture obtained in the step (2) and discharging methane;
(4) recycling at least part of the liquid phase obtained in the step (3) for use in the step (1);
wherein the amount of liquid phase recycled for use in step (1) is 2-10% by weight relative to the straw.
Preferably, in the step (1), the weight ratio of the straw to the water to the acid is 1:3-5: 0.1-1.
Preferably, the weight ratio of the straw to the water to the acid is 1:3-4: 0.4-0.9.
Preferably, the acid is hydrochloric acid with a concentration of 0.1-0.5 mol/L.
Preferably, the conditions of the extrusion-puffing process include: the temperature is 40-60 ℃, the screw rotation speed is 40-80r/min, and the processing time is 4-7 h.
Preferably, in the step (2), the weight ratio of the kitchen garbage, the excrement and the straws is 1:0.2-0.8: 0.3-0.7.
Preferably, the weight ratio of the kitchen garbage, the excrement and the straws is 1:0.3-0.5: 0.4-0.6.
Preferably, in step (3), the anaerobic fermentation conditions include: the fermentation temperature is 15-40 deg.C, and the fermentation time is 3-10 h.
Preferably, the conditions of the anaerobic fermentation include: the fermentation temperature is 20-30 deg.C, and the fermentation time is 5-7 h.
Preferably, the amount of liquid phase recycled for use in step (1) is from 3 to 6% by weight with respect to the straw.
Compared with the prior art, the specific method provided by the invention has the advantages that the steps are mutually matched and cooperated, the obtained biogas has high yield, the method is simple, excessive addition agents are not required, the existing waste materials are fully utilized, and the resource utilization maximization is realized.
Detailed Description
The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual points, and between the individual points may be combined with each other to give one or more new ranges of values, and these ranges of values should be considered as specifically disclosed herein.
The invention provides a biogas preparation method for kitchen waste treatment, which comprises the following steps:
(1) mixing straws, water and acid, and performing extrusion puffing treatment to obtain a liquid-phase material;
(2) mixing kitchen waste and excrement, and then mixing the mixture with the liquid-phase material;
(3) carrying out anaerobic fermentation on the mixture obtained in the step (2) and discharging methane;
(4) recycling at least part of the liquid phase obtained in the step (3) for use in the step (1);
wherein the amount of liquid phase recycled for use in step (1) is 2-10% by weight relative to the straw.
The inventor researches and discovers that the biogas yield can be improved without adding other auxiliary agents by treating straws, kitchen waste and excrement in the specific mode and recycling the liquid phase obtained by anaerobic fermentation in the step (3) in the step (1). In the prior art, the straw or the kitchen garbage is usually required to be subjected to complex treatment and then to mixing and fermentation.
In the present invention, the feces may be human or animal feces, and those skilled in the art may freely select the feces according to circumstances, which is not limited by the present invention.
According to the invention, in the step (1), the weight ratio of the straw, the water and the acid is preferably 1:3-5: 0.1-1. Under this preferred scheme, more do benefit to full play acid, circulation liquid phase in the extrusion swelling and cooperate each other to the digestion effect that carries out to the straw to make full use of straw.
More preferably, the weight ratio of the straw, the water and the acid is 1:3-4: 0.4-0.9.
In the present invention, preferably, the acid is hydrochloric acid having a concentration of 0.1 to 0.5 mol/L.
According to the present invention, preferably, the conditions of the extrusion-expansion process include: the temperature is 40-60 ℃, the screw rotation speed is 40-80r/min, and the processing time is 4-7 h. Under this preferred scheme, more do benefit to and fully puff the material after the mixture. Other conditions of the extrusion puffing treatment in the invention can be freely adjusted by the skilled in the art according to the requirements, and the influence on the result of the invention is small, and the invention is not limited to this.
According to the invention, in the step (2), the weight ratio of the kitchen garbage, the excrement and the straw is preferably 1:0.2-0.8: 0.3-0.7. The inventor further researches and discovers that under the preferable scheme, the biogas yield can be further improved by scientifically proportioning the three materials.
More preferably, the weight ratio of the kitchen garbage, the excrement and the straws is 1:0.3-0.5: 0.4-0.6.
According to the present invention, preferably, in step (3), the anaerobic fermentation conditions include: the fermentation temperature is 15-40 deg.C, and the fermentation time is 3-10 h. The inventor further researches and discovers that the method can improve the yield of the biogas and reduce the energy consumption under the conditions of lower fermentation temperature and shorter fermentation time.
More preferably, the conditions of the anaerobic fermentation include: the fermentation temperature is 20-30 deg.C, and the fermentation time is 5-7 h.
According to the invention, the liquid phase recycled for use in step (1) is preferably used in an amount of 3-6% by weight with respect to the straw. Under the preferred scheme, the biogas yield can be further improved.
In the present invention, the equipment for the extrusion puffing treatment and the anaerobic fermentation treatment is not limited at all, and any equipment can be used in the present invention as long as the purpose of puffing and fermentation can be achieved, and the details are not described herein.
In the invention, the mixing conditions in each step are not limited, as long as the mixing is completely and uniformly facilitated, and the mixing time is 20-50min generally.
According to a preferred embodiment of the present invention, the method for preparing biogas for kitchen waste treatment comprises the following steps:
(1) mixing straws, water and acid, and performing extrusion puffing treatment to obtain a liquid-phase material;
the weight ratio of the straw to the water to the acid is 1:3-5:0.1-1, and the acid is hydrochloric acid with the concentration of 0.1-0.5 mol/L;
the extrusion puffing treatment conditions comprise: the temperature is 40-60 ℃, the screw rotation speed is 40-80r/min, and the processing time is 4-7 h;
(2) mixing kitchen waste and excrement, and then mixing the mixture with the liquid-phase material;
the weight ratio of the kitchen garbage, the excrement and the straw is 1:0.2-0.8: 0.3-0.7;
(3) carrying out anaerobic fermentation on the mixture obtained in the step (2) and discharging methane;
the anaerobic fermentation conditions include: the fermentation temperature is 15-40 ℃, and the fermentation time is 3-10 h;
(4) recycling at least part of the liquid phase obtained in the step (3) for use in the step (1);
wherein the amount of liquid phase recycled for use in step (1) is 2-10% by weight relative to the straw. Under the preferred scheme, the synergistic effect of each material and each step can be fully exerted, and the yield of the biogas is optimal.
The present invention will be described in detail below by way of examples. In the following examples, the acid is hydrochloric acid, the kitchen waste is domestic kitchen waste, and the feces is human feces.
Example 1
(1) Mixing straw, water and acid for 30min, and performing extrusion and puffing treatment to obtain a liquid-phase material; wherein the using amount of the straws is 100 g;
(2) mixing the kitchen waste and the excrement for 30min, and then mixing the mixture with the liquid-phase material for 30 min;
(3) carrying out anaerobic fermentation on the mixture obtained in the step (2) and discharging methane;
(4) recycling at least part of the liquid phase obtained in step (3) for use in step (1).
Examples 2 to 3
The procedure is as in example 1, except that the amounts of the starting materials and the process parameters indicated in Table 1 are used.
Examples 4 to 5
The procedure is as in example 1, except that the amounts of the starting materials and the process parameters indicated in Table 1 are used.
Example 6
The procedure of example 1 was followed except that the screw rotation speed in the extrusion-expansion treatment was different from that in example 1, specifically, the screw rotation speed was 130 r/min.
Example 7
The procedure is as in example 1, except that the fermentation temperature is different and 80 ℃.
Comparative example 1
The procedure of example 1 was followed except that feces were not introduced in step (2) and step (4) was not employed.
Comparative example 2
The procedure of example 1 was followed except that the circulating liquid phase was not used, that is, the step (4) was not carried out.
Comparative example 3
The procedure is as in example 1, except that the amount of liquid phase recycled is different, in particular 50% by weight of the liquid phase recycled for use in step (1) with respect to the straw.
TABLE 1
Wherein the amount of the circulating liquid phase refers to the amount of the liquid phase used in the step (1) in the circulation relative to the straws.
Test example
In the methods of examples 1 to 7 and comparative examples 1 to 3 described above, the biogas generated on the 8 th day was collected, the biogas volume and composition were measured, and the biogas production improvement rate and methane production improvement rate of examples 1 to 7 and comparative examples 2 to 3 were calculated with respect to comparative example 1, wherein the calculation formula is (production of example to be measured-production of comparative example 1)/production of comparative example 1.
TABLE 2
| Example numbering | The yield of the biogas is increased by% | Rate of increase of methane production% |
| Example 1 | 60 | 27 |
| Example 2 | 57 | 29 |
| Example 3 | 62 | 25 |
| Example 4 | 53 | 22 |
| Example 5 | 50 | 20 |
| Example 6 | 48 | 19 |
| Example 7 | 49 | 22 |
| Comparative example 2 | 5 | 3 |
| Comparative example 3 | 18 | 15 |
As can be seen from the results of table 1, the examples according to the present invention have significantly better effects.
The preferred embodiments of the present invention have been described above in detail, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, many simple modifications can be made to the technical solution of the invention, including combinations of various technical features in any other suitable way, and these simple modifications and combinations should also be regarded as the disclosure of the invention, and all fall within the scope of the invention.
Claims (10)
1. A biogas preparation method for kitchen waste treatment comprises the following steps:
(1) mixing straws, water and acid, and performing extrusion puffing treatment to obtain a liquid-phase material;
(2) mixing kitchen waste and excrement, and then mixing the mixture with the liquid-phase material;
(3) carrying out anaerobic fermentation on the mixture obtained in the step (2) and discharging methane;
(4) recycling at least part of the liquid phase obtained in the step (3) for use in the step (1);
wherein the amount of liquid phase recycled for use in step (1) is 2-10% by weight relative to the straw.
2. The method as claimed in claim 1, wherein in the step (1), the weight ratio of the straw, the water and the acid is 1:3-5: 0.1-1.
3. The method of claim 1, wherein the weight ratio of the straw, water and acid is 1:3-4: 0.4-0.9.
4. The process according to claim 1 or 2, wherein the acid is hydrochloric acid having a concentration of 0.1-0.5 mol/L.
5. The method of claim 1, wherein the conditions of the extrusion process comprise: the temperature is 40-60 ℃, the screw rotation speed is 40-80r/min, and the processing time is 4-7 h.
6. The method according to claim 1, wherein in the step (2), the weight ratio of the kitchen garbage, the excrement and the straw is 1:0.2-0.8: 0.3-0.7.
7. The method of claim 6, wherein the weight ratio of the kitchen waste, the feces and the straw is 1:0.3-0.5: 0.4-0.6.
8. The method of claim 1, wherein in step (3), the anaerobic fermentation conditions comprise: the fermentation temperature is 15-40 deg.C, and the fermentation time is 3-10 h.
9. The method of claim 8, wherein the conditions of anaerobic fermentation comprise: the fermentation temperature is 20-30 deg.C, and the fermentation time is 5-7 h.
10. The process according to claim 1, wherein the amount of liquid phase recycled for use in step (1) is 3-6% by weight with respect to the straw.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011544585.5A CN112501215A (en) | 2020-12-23 | 2020-12-23 | Biogas preparation method for kitchen waste treatment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011544585.5A CN112501215A (en) | 2020-12-23 | 2020-12-23 | Biogas preparation method for kitchen waste treatment |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101775412A (en) * | 2010-03-19 | 2010-07-14 | 南京工业大学 | Method for preparing biogas by using lignocellulose |
| CN103451095A (en) * | 2013-09-05 | 2013-12-18 | 广西华淇节能环保工程有限公司 | Method for preparing marsh gas through straw, excrement and kitchen waste |
| CN103820502A (en) * | 2014-03-05 | 2014-05-28 | 东南大学 | Two-phase anaerobic fermentation method for biogas production |
| CN108570483A (en) * | 2017-09-14 | 2018-09-25 | 东北师范大学 | A method of it improving stalk fermentation and prepares biogas |
| CN109321607A (en) * | 2018-12-24 | 2019-02-12 | 瑞昊新能源科技集团有限公司 | The method for preparing biogas using wood fiber raw material anaerobic fermentation |
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2020
- 2020-12-23 CN CN202011544585.5A patent/CN112501215A/en active Pending
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|---|---|---|---|---|
| CN101775412A (en) * | 2010-03-19 | 2010-07-14 | 南京工业大学 | Method for preparing biogas by using lignocellulose |
| CN103451095A (en) * | 2013-09-05 | 2013-12-18 | 广西华淇节能环保工程有限公司 | Method for preparing marsh gas through straw, excrement and kitchen waste |
| CN103820502A (en) * | 2014-03-05 | 2014-05-28 | 东南大学 | Two-phase anaerobic fermentation method for biogas production |
| CN108570483A (en) * | 2017-09-14 | 2018-09-25 | 东北师范大学 | A method of it improving stalk fermentation and prepares biogas |
| CN109371066A (en) * | 2018-12-05 | 2019-02-22 | 黑龙江省能源环境研究院 | A kind of more raw material collaboration anaerobic fermentation methods |
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Application publication date: 20210316 |