CN110747238A - Process for preparing carbon source by utilizing kitchen waste - Google Patents
Process for preparing carbon source by utilizing kitchen waste Download PDFInfo
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- CN110747238A CN110747238A CN201911128693.1A CN201911128693A CN110747238A CN 110747238 A CN110747238 A CN 110747238A CN 201911128693 A CN201911128693 A CN 201911128693A CN 110747238 A CN110747238 A CN 110747238A
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- 239000010806 kitchen waste Substances 0.000 title claims abstract description 81
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 73
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 73
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 26
- 239000008399 tap water Substances 0.000 claims abstract description 47
- 235000020679 tap water Nutrition 0.000 claims abstract description 47
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- 238000000855 fermentation Methods 0.000 claims abstract description 32
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 27
- 238000010438 heat treatment Methods 0.000 claims abstract description 15
- 238000001914 filtration Methods 0.000 claims abstract description 14
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- 239000012535 impurity Substances 0.000 claims abstract description 5
- 239000002699 waste material Substances 0.000 claims abstract description 4
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 30
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 27
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 20
- VBICKXHEKHSIBG-UHFFFAOYSA-N 1-monostearoylglycerol Chemical compound CCCCCCCCCCCCCCCCCC(=O)OCC(O)CO VBICKXHEKHSIBG-UHFFFAOYSA-N 0.000 claims description 12
- VMHLLURERBWHNL-UHFFFAOYSA-M Sodium acetate Chemical compound [Na+].CC([O-])=O VMHLLURERBWHNL-UHFFFAOYSA-M 0.000 claims description 11
- 239000001632 sodium acetate Substances 0.000 claims description 11
- 235000017281 sodium acetate Nutrition 0.000 claims description 11
- 239000004088 foaming agent Substances 0.000 claims description 10
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- 239000000706 filtrate Substances 0.000 claims description 8
- 239000000126 substance Substances 0.000 claims description 8
- 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 claims description 7
- 239000008103 glucose Substances 0.000 claims description 7
- 230000001105 regulatory effect Effects 0.000 claims description 7
- 238000005238 degreasing Methods 0.000 claims description 6
- 229940075507 glyceryl monostearate Drugs 0.000 claims description 6
- 239000001788 mono and diglycerides of fatty acids Substances 0.000 claims description 6
- WQZGKKKJIJFFOK-VFUOTHLCSA-N beta-D-glucose Chemical compound OC[C@H]1O[C@@H](O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-VFUOTHLCSA-N 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 4
- OLUJUQKZMDLFII-UHFFFAOYSA-N 1-phenyloct-1-en-3-ol Chemical compound CCCCCC(O)C=CC1=CC=CC=C1 OLUJUQKZMDLFII-UHFFFAOYSA-N 0.000 claims description 3
- 229920001213 Polysorbate 20 Polymers 0.000 claims description 3
- 229940044949 eucalyptus oil Drugs 0.000 claims description 3
- 239000010642 eucalyptus oil Substances 0.000 claims description 3
- 239000000256 polyoxyethylene sorbitan monolaurate Substances 0.000 claims description 3
- 235000010486 polyoxyethylene sorbitan monolaurate Nutrition 0.000 claims description 3
- 230000003750 conditioning effect Effects 0.000 claims description 2
- 150000004666 short chain fatty acids Chemical class 0.000 abstract description 5
- 238000002360 preparation method Methods 0.000 abstract description 4
- 229910001220 stainless steel Inorganic materials 0.000 description 12
- 239000010935 stainless steel Substances 0.000 description 12
- 230000000052 comparative effect Effects 0.000 description 10
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
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- 230000001276 controlling effect Effects 0.000 description 4
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- 210000000988 bone and bone Anatomy 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 150000007524 organic acids Chemical class 0.000 description 2
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- 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 2
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- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 239000000232 Lipid Bilayer Substances 0.000 description 1
- 239000004677 Nylon 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
- C12P7/00—Preparation of oxygen-containing organic compounds
- C12P7/40—Preparation of oxygen-containing organic compounds containing a carboxyl group including Peroxycarboxylic acids
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- 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)
- General Health & Medical Sciences (AREA)
- Genetics & Genomics (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention relates to the technical field of garbage treatment, and discloses a process for preparing a carbon source by utilizing kitchen garbage, which is characterized by comprising the following steps of: the collected kitchen waste is treated by the following steps: s1: removing impurities; s2: removing grease; adding tap water into the kitchen waste treated by the S1 to submerge the waste by the tap water; then continuously heating the garbage containing tap water until the tap water boils, and continuously boiling the tap water for 20-30 min; finally, filtering the water, and continuing the kitchen waste to the next step; s3: anaerobic fermentation; the carbon source is prepared through the steps. By using tap water to cook the kitchen waste, grease in the kitchen waste is dissolved out and floats on the water surface, and then the grease on the water surface is filtered, so that the purpose of reducing the grease in the kitchen waste is achieved, the maximum yield of short-chain fatty acid generated in S3 anaerobic fermentation can be increased, and the carbon source content of subsequent preparation is increased.
Description
Technical Field
The invention relates to the technical field of garbage treatment, in particular to a process for preparing a carbon source by utilizing kitchen garbage.
Background
The kitchen waste refers to waste generated in activities such as daily life, food processing, food service, unit meal supply and the like of residents, and comprises discarded vegetable leaves, leftovers, fruit peels, eggshells, soup rice, bones and the like, and the kitchen waste is mainly sourced from household kitchens, restaurants, dining halls, markets and other industries related to food processing. The kitchen waste contains extremely high moisture and organic matters, is easy to decay and generates stink.
For example, chinese patent No. CN103243125B discloses a method for anaerobic production of carbon source from kitchen waste, which comprises the steps of, firstly, removing impurities and pulverizing the kitchen waste, removing substances which are not beneficial to fermentation, such as paper, plastics, and inorganic substances, and pulverizing the kitchen waste to below 1 cm, which is suitable for anaerobic hydrolysis to produce acid. Secondly, putting the pretreated kitchen waste into an anaerobic acid production reactor for fermentation, controlling the pH, the temperature and the stirring process, so that acetic acid, propionic acid, butyric acid, valeric acid and ethanol products are produced by fermentation, and hydrogen is produced at the same time; and (3) obtaining the supernatant rich in organic acid by the fermented kitchen waste through a centrifugal separation device, introducing the supernatant into a nitrogen and phosphorus removal system at the centrifugal rotation speed of 8000-10000 r/min, and finally treating the kitchen waste residues generated by centrifugation. By utilizing the characteristic of high organic matter content of the kitchen waste and combining an anaerobic hydrolysis acidification process, the kitchen waste is subjected to anaerobic hydrolysis fermentation, and the operating conditions in the reaction stage are controlled to generate volatile organic acid which mainly comprises acetic acid, propionic acid, butyric acid, valeric acid and ethanol, which are organic matters with the nitrogen and phosphorus removal effects, so that the problems of high cost and high toxicity of traditional carbon sources such as methanol and the like can be solved, and the reduction, recycling and harmless treatment of the kitchen waste can be realized.
A large amount of grease exists in the kitchen waste, and the existence of the grease can influence the anaerobic fermentation process in the steps. The higher the content of the grease is, the smaller the maximum yield of the short-chain fatty acid generated by anaerobic fermentation of the kitchen waste is. And the short-chain fatty acid is part of the carbon source, so that the content of the carbon source prepared by using the kitchen waste in the production process is reduced.
Disclosure of Invention
The invention aims to provide a process for preparing a carbon source by utilizing kitchen waste, which solves the problem of reducing grease in the kitchen waste.
The technical purpose of the invention is realized by the following technical scheme:
a process for preparing a carbon source by utilizing kitchen waste is characterized by comprising the following steps: the collected kitchen waste is treated by the following steps:
s1: removing impurities;
s2: removing grease; adding tap water into the kitchen waste treated by the S1 to submerge the waste by the tap water; then continuously heating the garbage containing tap water until the tap water boils, and continuously boiling the tap water for 20-30 min; finally, filtering the water, and continuing the kitchen waste to the next step;
s3: anaerobic fermentation;
the carbon source is prepared through the steps.
Through adopting above-mentioned technical scheme, through using the running water to cook kitchen garbage, from can making the grease dissolve out from kitchen garbage, because the boiling state that is in that water lasts to make kitchen garbage's the internal energy in surface increase, the energy of grease molecule self wherein increases, decomposes out from kitchen garbage, finally makes the grease float on the surface of water of running water, filters after that, filters the grease on the surface of water, thereby can make the grease in the kitchen garbage reduce. By using tap water to cook the kitchen waste, grease in the kitchen waste is dissolved out and floats on the water surface, and then the grease on the water surface is filtered, so that the purpose of reducing the grease in the kitchen waste is achieved, the maximum yield of short-chain fatty acid generated in S3 anaerobic fermentation can be increased, and the carbon source content of subsequent preparation is increased.
As a further improvement of the invention, in the oil and fat removal of S2, after tap water is added into the kitchen waste, alcohol with the mass concentration of 85% is added into the tap water in the kitchen waste, and the mass ratio of the alcohol to the tap water is 1 (70-80).
By adopting the technical scheme, the alcohol is added into the tap water, so that more grease in the kitchen waste can be dissolved out. Because tap water is heated and is easy to volatilize in the heating process, 85% alcohol with higher concentration is selected, and after a part of alcohol is volatilized, the residual part can still play the role of extracting grease.
As a further improvement of the invention, in the oil and fat removal of S2, after tap water is added to the kitchen waste, a foaming agent is continuously added to the kitchen waste.
Through adopting above-mentioned technical scheme, through adding the foaming agent, can make the solubility of grease in aqueous worse for aquatic grease is still less, thereby makes more grease float on the surface of water, gets rid of the grease when conveniently filtering.
As a further improvement of the invention, the foaming agent comprises the following chemical components in parts by weight: 2-7 parts of glyceryl monostearate, 1-3 parts of eucalyptus oil, 10-18 parts of polyoxyethylene sorbitan monolaurate and 0.5-1.3 parts of amyl cinnamyl alcohol.
According to the technical scheme, the glyceryl monostearate is β -crystal at normal temperature, a lipid bilayer structure is presented, the middle of the glyceryl monostearate is connected by polar groups through hydrogen bonds, so that the glyceryl monostearate has strong affinity with water, then in the process of removing the grease, tap water needs to be heated to boiling, the boiling is continuously kept, and the water begins to permeate into the bilayer along with the rise of the temperature to form a layered intermediate phase.
As a further improvement of the method, after filtering in the oil removal of S2, taking filtrate, standing the filtrate for 10-30min, removing an upper oil floating layer after oil-water separation, and pouring lower liquid into the kitchen waste; and then carrying out secondary heating, keeping tap water to submerge the kitchen waste all the time, then keeping the tap water boiling for 20-30min, filtering the tap water, taking the kitchen waste, and then carrying out S3 anaerobic fermentation.
Through twice cooking of the kitchen waste, more grease can be discharged from the kitchen waste.
As a further improvement of the invention, the anaerobic fermentation of S3 further comprises the following steps of S4: adjusting COD of the carbon source.
Because the COD value of the carbon source obtained after anaerobic fermentation is not high enough, the carbon source can not meet the requirement when the carbon source is needed to treat sewage and wastewater. By adjusting the COD value of the carbon source, the COD value of the carbon source can be adjusted according to more practical requirements, and the universality of the carbon source is enhanced.
As a further improvement of the present invention, S4 regulates COD of the carbon source: COD conditioning solution was added towards the carbon source after anaerobic fermentation at S3.
As a further improvement of the invention, the COD regulating solution is one or more of methanol, sodium acetate, acetic acid and glucose.
By adopting the technical scheme, the COD value of the carbon source can be adjusted to a required value due to different COD values of the methanol, the sodium acetate, the acetic acid and the glucose, so that the universality of the carbon source is improved.
As a further improvement of the invention, in the S3 anaerobic fermentation, the pH value during the anaerobic fermentation is adjusted to 5.5-7; and the temperature is kept between 30 and 40 ℃.
By adopting the technical scheme, the pH value in the fermentation process is adjusted to 5.5-7, so that the yield of volatile fatty acid is higher, and meanwhile, the activity of anaerobic bacteria is stronger in the process of keeping the temperature at 30-40 ℃, so that the fermentation efficiency is higher.
In conclusion, the invention has the advantages and beneficial effects that:
1. by using tap water to cook the kitchen waste, grease in the kitchen waste is dissolved out and floats on the water surface, and then the grease on the water surface is filtered, so that the purpose of reducing the grease in the kitchen waste is achieved, and finally the maximum yield of short-chain fatty acid generated in S3 anaerobic fermentation can be increased, so that the content of a carbon source prepared subsequently is increased;
2. by adding alcohol into tap water, more grease in the kitchen waste can be dissolved out;
3. by adding the foaming agent, the solubility of the grease in water is poorer, and the grease in water is less, so that more grease floats on the water surface, and the grease is conveniently removed during filtering;
4. by adjusting the COD value of the carbon source, the COD value of the carbon source can be adjusted according to more practical requirements, and the universality of the carbon source is enhanced.
Drawings
FIG. 1 is a process flow diagram of a process for preparing a carbon source by using kitchen waste.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Example 1:
referring to fig. 1, a process for preparing a carbon source by using kitchen waste, which comprises the following steps of:
s1: and (5) removing impurities. Removing substances which are not beneficial to fermentation, such as bones, chopsticks, toothpicks, paper, plastics, inorganic substances and the like in the kitchen waste, then washing the kitchen waste by using clear water, and separating water after washing with water from the kitchen waste by using a filtering mode.
S2: and (4) removing grease. Weighing 10kg of kitchen waste treated by S1, placing the kitchen waste in a stainless steel pot, adding tap water until the kitchen waste is submerged, and adding 85% alcohol into the stainless steel pot, wherein the mass ratio of the added alcohol to the tap water in the stainless steel pot is 1: 75. After adding alcohol, adding a foaming agent into a stainless steel pot, wherein the foaming agent comprises 4.5 parts of glyceryl monostearate, 2 parts of eucalyptus oil, 14 parts of polyoxyethylene sorbitan monolaurate and 1.4 parts of amyl cinnamyl alcohol in parts by weight; and the amount of the bubble agent is 0.2g/L based on the volume of tap water.
After the above steps are completed, the stainless steel pot is heated, and the heating is continuously carried out until tap water in the pot boils, and the stirring is carried out while heating. Boiling was maintained for 25min with constant stirring. Then slowly reducing the temperature of the stainless steel pot until the temperature of tap water in the stainless steel pot is reduced to 70 ℃, and filtering. Taking the filtrate, standing the filtrate for 20min, removing the upper oil slick layer after oil-water separation, and pouring the lower liquid into the kitchen waste. Repeating the process again, carrying out secondary heating on the kitchen waste, and adding tap water towards the stainless steel pot to enable the tap water to submerge the kitchen waste and continue heating; the tap water remained boiling for the same time before and after the two times. Before heating, adding 85% alcohol by mass concentration, wherein the mass ratio of the addition amount to tap water in the stainless steel pot is 1: 100. After the heating finishes, reduce the temperature of stainless steel pot for the temperature of running water reduces to the room temperature in the stainless steel pot, then filters, and nylon wire or multilayer gauze are chooseed for use as the filter screen to the filter screen during the filtration, extrudees kitchen garbage when filterable, makes the moisture in the kitchen garbage extruded.
S3: and (5) anaerobic fermentation. And (4) crushing the kitchen waste treated by the S2 to obtain particles with the particle size of below 2 cm. And then, putting the crushed kitchen waste into an anaerobic acid production reactor for fermentation, controlling the pH to be 6, controlling the temperature to be 35 ℃, and controlling the anaerobic fermentation time to be 6 days. And (4) after the fermentation lasts for 6 days, carrying out centrifugal separation on the fermented kitchen waste, adjusting the centrifugal rotation speed to 9000r/min, and taking supernatant.
S4: adjusting COD of the carbon source. And (3) determining the COD value of the produced carbon source by using a COD (chemical oxygen demand) tester, wherein the supernatant treated by the S3 is the produced carbon source. The COD equivalent of the produced carbon source was measured to be 0.25 mg. And then adding a COD regulating solution into the produced carbon source, wherein the COD regulating solution can be one or more of methanol, sodium acetate and glucose, the COD equivalent of the methanol is 1.5mg, the COD equivalent of the sodium acetate is 0.78mg, the COD equivalent of the acetic acid is 1.06mg and the COD equivalent of the glucose is 1.06 mg. In this embodiment, the COD regulating solution selects sodium acetate, adds acetic acid simultaneously, through adding sodium acetate and acetic acid of different weight to can adjust the COD equivalent weight of production carbon source, the production carbon source after adjusting the COD value is novel carbon source.
1mg of sodium acetate was added to the carbon source production, and then the equivalent of COD of the carbon source production of 1mg was allowed to rise to 1.03. Further, 1mg of acetic acid was added so that the COD equivalent of the finally obtained novel carbon source was 2.09 mg.
Examples 2 to 5 are different from example 1 in that the chemical composition ratios of the foaming agent in the degreasing in step S2 are shown in the following table in parts by weight: unit: portions are
Examples 6 to 9 are different from example 1 in that the mass ratio of alcohol and tap water added to the stainless steel pan for the first time in the degreasing of step S2 is as follows:
| examples | Example 6 | Example 7 | Example 8 | Example 9 |
| Mass concentration | 1:70 | 1:80 | 1:72 | 1:78 |
Example 10-example 13 differs from example 1 in that in the grease removal in step S2, the time for which the primary boiling of tap water continues is the same as the time for which the secondary boiling continues, as shown in the following table: unit: and (5) min. Meanwhile, examples 10 to 13 are different from example 1 in that in the degreasing in step S2, after the first heating and the completion of the filtration, the filtrate was left to stand for 10 min.
| Examples | Example 10 | Example 11 | Example 12 | Example 13 |
| Time of day | 20 | 30 | 23 | 28 |
Examples 14 to 17 are different from example 1 in that in the degreasing in step S2, after the first heating and the completion of the filtration, the filtrate was left to stand for 30 min. The pH during anaerobic fermentation in step S3 is shown in the following table:
| examples | Example 14 | Example 15 | Example 16 | Example 17 |
| pH | 5.5 | 7 | 6.5 | 6.5 |
Examples 18-21 differ from example 1 in that the temperatures during anaerobic fermentation in step S3 are as shown in the following table: unit: c
| Examples | Example 18 | Example 19 | Example 20 | Example 21 |
| Temperature of | 30 | 40 | 32 | 37 |
Example 22 is different from example 1 in that the COD adjusting solution in the COD of the carbon source adjusted in step S4 is methanol and sodium acetate.
Example 23 is different from example 1 in that the COD regulating solution in COD regulating carbon source of step S4 is methanol, sodium acetate and acetic acid.
Example 24 is different from example 1 in that sodium acetate and glucose are used as the COD adjusting solution in the COD adjusting the carbon source in step S4.
Example 25 is different from example 1 in that the COD adjusting liquid in the COD of the carbon source is adjusted to methanol and glucose in step S4.
Embodiment 26 differs from embodiment 1 in that step S4 is not included.
Comparative example 1: the process for preparing the carbon source by using the kitchen waste is the preparation process recorded in the grant publication No. CN 103243125B.
Comparative example 2: the difference from example 1 is that the grease removal in step S2 is omitted.
Comparative example 3: the difference from example 1 is that no alcohol is added in the two heating steps before and after the degreasing in step S2.
Comparative example 4: the difference from example 1 is that in the step of removing the fat and oil in step S2, no foaming agent is added.
COD measurement test:
the test method comprises the following steps: 8kg of the same batch of kitchen waste was selected, a carbon source was prepared by using the preparation processes described in examples 1, 3, 23, and 26 and comparative examples 1 to 4, and the carbon source was measured by using a COD measuring instrument sold by Bell analysis Instrument Co., Ltd., model No. BCOD5300, and the measurement results are shown in the following table.
| Examples | COD equivalent (mg) |
| Example 1 | 2.09 |
| Example 3 | 1.93 |
| Example 23 | 3.59 |
| Example 26 | 0.25 |
| Comparative example 1 | 0.17 |
| Comparative example 2 | 1.97 |
| Comparative example 3 | 1.92 |
| Comparative example 4 | 1.82 |
In the above tables, it is found from examples 1 and 23 that the COD equivalent of the novel carbon source produced by the process described in the present invention is the largest.
From the comparison of example 1 and example 26, the equivalent value of COD of the produced carbon source could not be used for the subsequent use without adding step S4.
As compared with comparative example 1, it was found that the COD equivalent of the produced carbon source was the lowest without adding step S4 and step S2.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (9)
1. A process for preparing a carbon source by utilizing kitchen waste is characterized by comprising the following steps: the collected kitchen waste is treated by the following steps:
s1: removing impurities;
s2: removing grease; adding tap water into the kitchen waste treated by the S1 to submerge the waste by the tap water; then continuously heating the garbage containing tap water until the tap water boils, and continuously boiling the tap water for 20-30 min; finally, filtering the water, and continuing the kitchen waste to the next step;
s3: anaerobic fermentation;
the carbon source is prepared through the steps.
2. The process for preparing the carbon source by utilizing the kitchen waste as claimed in claim 1, wherein the carbon source is prepared by the following steps: in the step of removing the grease by the S2, after tap water is added into the kitchen waste, alcohol with the mass concentration of 85% is added into the tap water in the kitchen waste, and the mass ratio of the alcohol to the tap water is 1 (70-80).
3. The process for preparing the carbon source by utilizing the kitchen waste as claimed in claim 2, wherein the carbon source is prepared by the following steps: and in the oil removal of the S2, after tap water is added to the kitchen waste, a foaming agent is continuously added to the kitchen waste.
4. The process for preparing the carbon source by utilizing the kitchen waste as claimed in claim 3, wherein the carbon source is prepared by the following steps: the foaming agent comprises the following chemical components in parts by weight: 2-7 parts of glyceryl monostearate, 1-3 parts of eucalyptus oil, 10-18 parts of polyoxyethylene sorbitan monolaurate and 0.5-1.3 parts of amyl cinnamyl alcohol.
5. The process for preparing the carbon source by utilizing the kitchen waste as claimed in claim 1, wherein the carbon source is prepared by the following steps: s2, filtering in degreasing, taking filtrate, standing the filtrate for 10-30min, layering oil and water, removing an upper oil floating layer, and pouring a lower layer of liquid into the kitchen waste; and then carrying out secondary heating, keeping tap water to submerge the kitchen waste all the time, then keeping the tap water boiling for 20-30min, filtering the tap water, taking the kitchen waste, and then carrying out S3 anaerobic fermentation.
6. The process for preparing the carbon source by utilizing the kitchen waste as claimed in claim 1, wherein the carbon source is prepared by the following steps: the step S4 is also included after the S3 anaerobic fermentation: adjusting COD of the carbon source.
7. The process for preparing the carbon source by utilizing the kitchen waste as claimed in claim 6, wherein the carbon source is prepared by the following steps: s4 regulates COD of carbon source: COD conditioning solution was added towards the carbon source after anaerobic fermentation at S3.
8. The process for preparing the carbon source by utilizing the kitchen waste as claimed in claim 7, wherein the carbon source is prepared by the following steps: the COD regulating solution is one or more of methanol, sodium acetate, acetic acid and glucose.
9. The process for preparing the carbon source by utilizing the kitchen waste as claimed in claim 1, wherein the carbon source is prepared by the following steps: in the S3 anaerobic fermentation, the pH value during the anaerobic fermentation is adjusted to 5.5-7; and the temperature is kept between 30 and 40 ℃.
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