CN111440831A - Method for enhancing kitchen waste anaerobic fermentation production of volatile fatty acid and dehydration performance by using eggshell conditioning and application thereof - Google Patents
Method for enhancing kitchen waste anaerobic fermentation production of volatile fatty acid and dehydration performance by using eggshell conditioning and application thereof Download PDFInfo
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- 238000006297 dehydration reaction Methods 0.000 title claims abstract description 27
- 235000014113 dietary fatty acids Nutrition 0.000 title claims abstract description 27
- 229930195729 fatty acid Natural products 0.000 title claims abstract description 27
- 239000000194 fatty acid Substances 0.000 title claims abstract description 27
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 21
- 230000002708 enhancing effect Effects 0.000 title claims abstract description 15
- 230000003750 conditioning effect Effects 0.000 title claims description 10
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 15
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 15
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- 238000005496 tempering Methods 0.000 claims abstract description 7
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- 239000000203 mixture Substances 0.000 claims abstract description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 26
- 238000004062 sedimentation Methods 0.000 claims description 15
- 229910052757 nitrogen Inorganic materials 0.000 claims description 13
- 239000007787 solid Substances 0.000 claims description 11
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 9
- 239000005416 organic matter Substances 0.000 claims description 8
- NQPDZGIKBAWPEJ-UHFFFAOYSA-N valeric acid Chemical compound CCCCC(O)=O NQPDZGIKBAWPEJ-UHFFFAOYSA-N 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 3
- 238000005728 strengthening Methods 0.000 claims description 2
- 229940005605 valeric acid Drugs 0.000 claims description 2
- 239000002002 slurry Substances 0.000 abstract description 10
- 239000010815 organic waste Substances 0.000 abstract description 8
- 230000009467 reduction Effects 0.000 abstract description 4
- 239000002994 raw material Substances 0.000 abstract description 3
- 238000006243 chemical reaction Methods 0.000 description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 11
- 238000010521 absorption reaction Methods 0.000 description 9
- 238000011081 inoculation Methods 0.000 description 8
- 238000010907 mechanical stirring Methods 0.000 description 8
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- 210000002966 serum Anatomy 0.000 description 8
- 241000196324 Embryophyta Species 0.000 description 6
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- 235000013601 eggs Nutrition 0.000 description 4
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- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
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- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910000019 calcium carbonate Inorganic materials 0.000 description 2
- 229910001424 calcium ion Inorganic materials 0.000 description 2
- 239000013043 chemical agent Substances 0.000 description 2
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- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
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- 230000005611 electricity Effects 0.000 description 1
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- 230000016615 flocculation Effects 0.000 description 1
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- 230000036541 health Effects 0.000 description 1
- 230000003403 homoacetogenic effect Effects 0.000 description 1
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- 239000000543 intermediate Substances 0.000 description 1
- 239000013067 intermediate product Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 235000013372 meat Nutrition 0.000 description 1
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- 239000011573 trace mineral Substances 0.000 description 1
- 235000013619 trace mineral Nutrition 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Classifications
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
-
- 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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- Biotechnology (AREA)
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- Bioinformatics & Cheminformatics (AREA)
- General Engineering & Computer Science (AREA)
- General Health & Medical Sciences (AREA)
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- Environmental & Geological Engineering (AREA)
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Abstract
The invention discloses a method for enhancing the production of volatile fatty acid and dehydration performance of kitchen waste by anaerobic fermentation through egg shell tempering and application thereof, the method comprises the steps of crushing collected kitchen waste into slurry, obtaining an anaerobic fermentation substrate and placing the anaerobic fermentation substrate in a reactor; adding the concentrated sludge into a reactor of a sewage plant as inoculated sludge; crushing waste egg shells, adding egg shell powder into an anaerobic fermentation sample, then removing oxygen, sealing a reactor, stirring to uniformly mix substances in the reactor, and carrying out anaerobic fermentation to produce acid. The invention prepares VFAs by anaerobic fermentation by taking the kitchen waste as a raw material, can synchronously realize the reduction and the resource utilization (production of volatile fatty acid) of the kitchen waste, egg shells and other organic wastes, improves the dehydration performance of fermentation residues, and provides an economic, effective, green and environment-friendly method for organic waste treatment.
Description
Technical Field
The invention belongs to the technical field of environmental protection and resource utilization, and relates to a method for promoting the efficiency of producing volatile fatty acid by anaerobic fermentation of kitchen waste and improving the dehydration performance of fermentation residues.
Background
With the progress of urbanization and the improvement of the living standard of people, organic wastes such as kitchen waste and the like generated in large quantity gradually become one of the factors which troubles the urban environment quality. The worldwide production of kitchen waste in 2012 is statistically up to 16 hundred million tons and continues to increase at a rate of 4.4% per year. In china, the amount of kitchen waste produced is currently increasing at a rate of 10%, accounting for 40-50% of municipal solid organic waste. On one hand, the large amount of kitchen waste brings a series of problems of affecting the appearance of the market, harming the health, spreading diseases, polluting water sources and the environment and the like. On the other hand, a large amount of organic matters in the kitchen waste are also a potential resource if the organic matters can be effectively utilized and recycled. It is predicted that the generation of Chinese kitchen waste will reach 1.4 million tons in 2020, and the energy contained in the waste is equivalent to the electricity generation of 1000 million tons of coal. Therefore, the kitchen waste has huge resource recovery potential and environmental and economic benefits.
The realization of the treatment of the kitchen waste through anaerobic fermentation is one of the current research hotspots. The anaerobic fermentation of the kitchen waste can form Volatile Fatty Acids (VFAs), methane and other energy substances. Among them, Volatile Fatty Acids (VFAs) are important organic substrates for biosynthesis of plastics and microbial fuel cells as intermediates of anaerobic fermentation. In addition, the VFAs can also be used as an effective carbon source of a sewage treatment plant so as to improve the nitrogen and phosphorus removal efficiency of sewage. Therefore, in recent years, efficient production of VFAs from organic wastes such as kitchen waste as fermentation substrates has attracted much attention in the environmental field. Anaerobic fermentation acidogenesis is mainly accomplished by functional microorganisms, and therefore the activity and vitality of the acidogenesis determine the efficacy of the final anaerobic fermentation. However, anaerobic fermentation of kitchen waste often leads to rapid decrease of system pH due to initial hydrolytic acidification, which in turn inhibits the activity of fermenting microorganisms. The online regulation and control of chemical agents (such as NaOH) not only has complex operation and increased operation cost, but also can generate secondary environmental pollution, and limits the large-scale application of the chemical agents in practical engineering to a certain extent.
In recent years, the consumption demand of Chinese egg products is continuously and rapidly increased, and the average egg of all people is increased by 51 percent in the last 10 years, and the average egg of all people occupies 22 kilograms. The eggshells left after the eggs are eaten are generally discarded as waste, and certain environmental load is generated. However, no report on the research on the utilization of eggshells to regulate and control the enhanced fermentation and acid production of kitchen waste has been found so far.
Disclosure of Invention
The purpose of the invention is as follows: aiming at the problems in the prior art, the invention provides a method for enhancing the production and dehydration performance of volatile fatty acid by anaerobic fermentation of kitchen waste by using eggshell conditioning, the method can effectively solve the problems of low yield of volatile fatty acid and the like caused by the reduction of pH and the inhibition of microbial activity in the acid production process of the anaerobic fermentation of the kitchen waste, and calcium ions rich in the eggshell can improve the dehydration performance of a fermented product and reduce the volume of fermentation residues.
The invention can synchronously realize the reduction and the resource utilization (volatile fatty acid production) of the kitchen waste, and provides an economic and effective technical measure for the treatment of organic wastes.
The invention also provides volatile fatty acid produced by the method for enhancing the dehydration performance and producing the volatile fatty acid by anaerobic fermentation of the kitchen waste by using egg shell tempering and application thereof.
The technical scheme is as follows: in order to achieve the above purpose, the method for enhancing the anaerobic fermentation production and dehydration performance of kitchen waste by using eggshell conditioning according to the invention comprises the following steps:
(1) crushing the collected kitchen waste into pulp, and placing an obtained anaerobic fermentation substrate in a reactor;
(2) adding the concentrated sludge into a reactor of a sewage plant as inoculated sludge;
(3) crushing waste egg shells, adding egg shell powder into an anaerobic fermentation substrate, then removing oxygen, sealing a reactor, stirring to uniformly mix substances in the reactor, and carrying out anaerobic fermentation to produce acid.
The kitchen waste is generally and directly recovered from a restaurant or a canteen, mainly rice is used as the main material, a small amount of vegetables such as meat and vegetables are crushed into slurry, and the preferable kitchen waste slurry with the solid content of about 10 percent is adopted, namely about 10g of kitchen waste per 100m L of kitchen waste slurry.
Wherein the inoculated sludge in the step (2) is the secondary sedimentation tank concentrated sludge of the sewage plant, and 10-20% of the secondary sedimentation tank concentrated sludge of the sewage plant is added according to the content of organic matters, specifically, the mass of the organic matters in the added secondary sedimentation tank concentrated sludge of the sewage plant accounts for 10-20% of the total mass of the secondary sedimentation tank concentrated sludge of the sewage plant and the organic matters in the kitchen waste; preferably, 10 percent of secondary sedimentation tank concentrated sludge of the sewage plant is added according to the organic matter content.
Preferably, the addition amount of the eggshell powder in the step (3) is 0.01-0.2 g/g dry weight of fermentation substrate and sludge, and the abandoned eggshell only needs to be crushed conventionally.
Preferably, the removing of oxygen in step (3) is nitrogen charging and oxygen removal.
Preferably, in the stirring step (3), the system materials in the reactor are uniformly mixed at 180 to 200 rpm. Preferably, the fermentation days for anaerobic fermentation in the step (3) are controlled to be 4-7 d, and the fermentation temperature is controlled to be 25-35 ℃;
the invention relates to volatile fatty acid produced by a method for enhancing the anaerobic fermentation production and dehydration performance of kitchen waste by using eggshell conditioning.
Wherein the volatile fatty acids comprise acetic acid and valeric acid.
The fermentation residue with better dehydration performance is obtained by the method for producing volatile fatty acid and dehydration performance by utilizing eggshell tempering and strengthening anaerobic fermentation of kitchen waste.
The basic principle of enhancing the VFAs production and dehydration performance of the kitchen waste by anaerobic fermentation through eggshell conditioning in the invention is as follows:
the eggshell contains a large amount of calcium carbonate (CaCO)3) The acid inhibition effect of pH reduction in the anaerobic fermentation process of the kitchen waste on anaerobic fermentation microorganisms in a fermentation system can be effectively neutralized and relieved; CaCO3CO formed by reaction with acids2Can be used as a synthetic substrate of homoacetogenic bacteria to synthesize VFAs such as acetic acid and the like, and relieve the acid inhibition effect; in addition, metal elements such as iron, manganese, zinc and the like contained in the eggshell are indispensable trace elements of anaerobic microorganisms, and the enzyme activity and the metabolic activity of fermentation microorganisms can be effectively improved, so that the hydrolysis acidification step in the fermentation process is improved, and the yield of VFAs is finally and greatly improved. Meanwhile, high-concentration calcium ions released by the waste egg shells can be beneficial to flocculation and precipitation of soluble organic matters (such as carbohydrate of fermentation substrates, extracellular polymer EPS formed by protein and the like), and the egg shell powder can be used as a framework to compress and release adsorption water in fermentation residues, so that the dehydration performance of the fermentation residues is improved.
Has the advantages that: compared with the prior art, the invention has the following advantages:
the invention prepares VFAs by anaerobic fermentation by taking the kitchen waste as a raw material, can synchronously realize the reduction and the resource utilization (production of volatile fatty acid) of the kitchen waste, egg shells and other organic wastes, improves the dehydration performance of fermentation residues, and provides an economic, effective, green and environment-friendly method for organic waste treatment.
The adding of the egg shell powder can obviously improve the efficiency of producing volatile fatty acid by anaerobic fermentation of the kitchen waste; can obviously improve the dehydration performance of the fermentation residues.
The VFAs produced by the invention are important intermediate products in the anaerobic fermentation process of the sludge, can be used as raw materials for synthesizing substances such as paint, coating, cosmetics and the like, are necessary organic carbon sources for biological nitrogen and phosphorus removal of sewage, and can effectively make up for the defect of insufficient organic carbon sources in the biological nitrogen and phosphorus removal process of the municipal sewage treatment plant.
Detailed Description
The present invention is further illustrated by the following examples.
Example 1
(1) Adding a certain amount of kitchen waste slurry with solid content of 10% into a serum bottle with the working volume of 600m L as a fermentation substrate (150m L), and simultaneously adding 10% of secondary sedimentation tank sludge (calculated by organic matter content) to mix to obtain inoculation sludge (the sludge is 200m L, and the concentration is 20g dry weight/L);
(2) adding 0.01g/g TSS (kitchen waste and sludge dry weight) of crushed egg shell powder into a reactor, filling nitrogen into the reactor to expel oxygen for 10min, sealing the reactor, uniformly mixing fermentation substrates by using mechanical stirring (180rpm), and then carrying out reaction, wherein the fermentation reaction temperature is controlled to be 35 ℃, the fermentation days are controlled to be 4d, the maximum content of VFAs is 5345.5 mgCOD/L, and the capillary water absorption time (CST, one of important indexes for evaluating the dehydration performance) of fermentation residues is 820.4 s.
Example 2
(1) Adding a certain amount of kitchen waste slurry with solid content of 10% into a serum bottle with the working volume of 600m L as a fermentation substrate (150m L), and simultaneously adding 10% of secondary sedimentation tank sludge (calculated by organic matter content) to mix to obtain inoculation sludge (the sludge is 200m L, and the concentration is 20g dry weight/L);
(2) adding 0.02g/g TSS into the reactor, filling nitrogen into the reactor to expel oxygen for 10min, sealing the reactor, uniformly mixing fermentation substrates by using mechanical stirring (180rpm), and then carrying out reaction, wherein the fermentation reaction temperature is controlled to be 35 ℃, the fermentation days are controlled to be 6d, the maximum content of VFAs is 13860.0mg COD/L, and the capillary water absorption time of fermentation residues is 670.4 s.
Example 3
(1) Adding a certain amount of kitchen waste slurry with solid content of 10% into a serum bottle with the working volume of 600m L as a fermentation substrate (150m L), and simultaneously adding 10% of secondary sedimentation tank sludge (calculated by organic matter content) to mix to obtain inoculation sludge (the sludge is 200m L, and the concentration is 20g dry weight/L);
(2) adding 0.1g/g TSS into the reactor, filling nitrogen into the reactor to expel oxygen for 10min, sealing the reactor, uniformly mixing fermentation substrates by using mechanical stirring (180rpm), and then carrying out reaction, wherein the fermentation reaction temperature is controlled to be 35 ℃, the fermentation days are controlled to be 7d, the maximum content of VFAs is 26890.5mg COD/L, and the capillary water absorption time of fermentation residues is 189.5 s.
Example 4
(1) Adding a certain amount of kitchen waste slurry with solid content of 10% into a serum bottle with the working volume of 600m L as a fermentation substrate (150m L), and simultaneously adding 10% of secondary sedimentation tank sludge (calculated by organic matter content) to mix to obtain inoculation sludge (the sludge is 200m L, and the concentration is 20g dry weight/L);
(2) adding 0.20g/g TSS into the reactor, filling nitrogen into the reactor to expel oxygen for 10min, sealing the reactor, uniformly mixing fermentation substrates by using mechanical stirring (180rpm), and then carrying out reaction, wherein the fermentation reaction temperature is controlled at 35 ℃, the fermentation days are controlled at 5d, the maximum content of VFAs is 28120.8mg COD/L, and the capillary water absorption time of fermentation residues is 169.0 s.
Example 5
(1) Adding a certain amount of kitchen waste slurry with solid content of 10% into a serum bottle with the working volume of 600m L as a fermentation substrate (150m L), and simultaneously adding 10% of secondary sedimentation tank sludge (calculated by organic matter content) to mix to obtain inoculation sludge (the sludge is 200m L, and the concentration is 20g dry weight/L);
(2) adding 0.10g/g TSS into the reactor, filling nitrogen into the reactor to expel oxygen for 10min, sealing the reactor, uniformly mixing fermentation substrates by using mechanical stirring (180rpm), and then carrying out reaction, wherein the fermentation reaction temperature is controlled at 25 ℃, the fermentation days are controlled at 7d, the maximum content of VFAs is 19508.2mg COD/L, and the capillary water absorption time of fermentation residues is 208.5 s.
Example 6
(1) Adding a certain amount of kitchen waste serous fluid with solid content of 5% into a serum bottle with the working volume of 600m L as a fermentation substrate, and simultaneously adding 20% (based on the content of organic matters) of secondary sedimentation tank sludge to be mixed as inoculation sludge;
(2) adding 0.1g/g TSS into the reactor, charging nitrogen into the reactor to expel oxygen for 10min, sealing the reactor, uniformly mixing fermentation substrates by using mechanical stirring (200rpm), and then carrying out reaction, wherein the fermentation reaction temperature is controlled at 30 ℃, the fermentation days are controlled at 5d, the maximum content of VFAs is 7256.5mg COD/L, and the capillary water absorption time of fermentation residues is 190.2 s.
Example 7
(1) Adding a certain amount of kitchen waste serous fluid with solid content of 20% into a serum bottle with the working volume of 600m L as a fermentation substrate, and simultaneously adding 15% (based on the content of organic matters) of secondary sedimentation tank sludge to be mixed as inoculation sludge;
(2) adding 0.15g/g TSS into the reactor, charging nitrogen into the reactor to expel oxygen for 10min, sealing the reactor, uniformly mixing fermentation substrates by using mechanical stirring (200rpm), and then carrying out reaction, wherein the fermentation reaction temperature is controlled at 30 ℃, the fermentation days are controlled at 6d, the maximum content of VFAs is 38150.9mg COD/L, and the capillary water absorption time of fermentation residues is 400.3 s.
Comparative example 1
(1) Adding a certain amount of kitchen waste slurry with solid content of 10% into a serum bottle with the working volume of 600m L as a fermentation substrate (150m L), and simultaneously adding 10% of secondary sedimentation tank sludge (calculated by organic matter content) to mix to obtain inoculation sludge (the sludge is 200m L, and the concentration is 20g dry weight/L);
(2) the method comprises the following steps of adding no egg shell powder into a reactor, filling nitrogen into the reactor for removing oxygen for 10min, sealing the reactor, uniformly mixing fermentation substrates by using mechanical stirring (180rpm), and then carrying out reaction, wherein the fermentation reaction temperature is controlled to be 35 ℃, the fermentation days are controlled to be 6d, the maximum content of VFAs is 2430.9mg COD/L, and the capillary water absorption time of fermentation residues is 1108.3 s.
The parameter conditions and results of examples 1 to 7 and comparative example 1 are shown in table 1.
TABLE 1 influence of the conditioning of waste egg shells on the production of VFAs and dehydration performance of kitchen waste by anaerobic fermentation
Therefore, the maximum accumulation concentration and time of fermentation products VFAs are obviously improved by the anaerobic fermentation of the kitchen waste modified by the waste eggshells, the maximum accumulation amount of VFAs in comparative example 1 reaches 2430.9mg COD/L at the 6 th d, but in a TSS reactor added with 0.02g of eggshells, the accumulation amount of VFAs reaches 11980.0mg COD/L at the 5 th d and 13860.0mg COD/L at the 6 th d, while in a TSS reactor added with 0.20g of eggshells, the accumulation amount of VFAs reaches 28120.8mg COD/L at the 5 th d, which is 11.5 times of that of comparative example 1, in addition, the fermentation temperature also influences the anaerobic fermentation and acid production of the waste eggshells modified by the fermentation, the addition of 0.10g of eggshells per g of the TSS reactor, the concentration of VFAs fermented at 35 ℃ is 26890.5 mg/L, the concentration of the fermented VFAs at 25 ℃ is 4 mg/L mg, the anaerobic fermentation and water absorption and the dewatering performance of the waste eggshells is improved by the TSS reactor added eggshells, and the capillary fermentation residue is only increased by 1108.3.169.
Claims (10)
1. A method for enhancing the anaerobic fermentation production and dehydration performance of kitchen waste by using eggshell conditioning is characterized by comprising the following steps:
(1) crushing the collected kitchen waste into pulp, and placing an obtained anaerobic fermentation substrate in a reactor;
(2) adding the concentrated sludge into a reactor of a sewage plant as inoculated sludge;
(3) crushing waste egg shells, adding egg shell powder into an anaerobic fermentation substrate, then removing oxygen, sealing a reactor, stirring to uniformly mix substances in the reactor, and carrying out anaerobic fermentation to produce acid.
2. The method for enhancing the production of volatile fatty acid and the dehydration performance of the kitchen waste by anaerobic fermentation through egg shell tempering according to claim 1, wherein the kitchen waste in the step (1) is kitchen waste with solid content of 5-20%.
3. The method for enhancing the anaerobic fermentation production of volatile fatty acid and dehydration performance of kitchen waste by using eggshell conditioning as claimed in claim 1, wherein the inoculated sludge in step (2) is secondary sedimentation tank concentrated sludge of sewage plant, and 10-20% of secondary sedimentation tank concentrated sludge of sewage plant is added according to organic matter content.
4. The method for enhancing the production of volatile fatty acid and the dehydration performance of kitchen waste by anaerobic fermentation through egg shell tempering according to claim 1, wherein the addition amount of the egg shell powder in the step (3) is 0.01-0.2 g/g of fermentation substrate and sludge.
5. The method for enhancing the production of volatile fatty acid and the dehydration performance of the anaerobic fermentation of kitchen waste by using eggshell conditioning as claimed in claim 1, wherein the oxygen removal in step (3) is preferably nitrogen-filled to expel oxygen.
6. The method for enhancing the production and dehydration performance of the kitchen waste by anaerobic fermentation through egg shell tempering according to claim 1, wherein the stirring in the step (3) is performed to uniformly mix the system materials in the reactor at 180-200 rpm.
7. The method for enhancing the production and dehydration performance of volatile fatty acid by anaerobic fermentation of kitchen waste through egg shell tempering according to claim 1, wherein the number of fermentation days for anaerobic fermentation in the step (3) is controlled to be 4-7 d, and the fermentation temperature is controlled to be 25-35 ℃.
8. The method for producing the volatile fatty acid and the dehydration performance by using the eggshell modified and reinforced kitchen waste anaerobic fermentation according to claim 1.
9. The volatile fatty acid of claim 1, wherein the volatile fatty acid comprises acetic acid and valeric acid.
10. The method for producing volatile fatty acid by modifying and strengthening kitchen waste anaerobic fermentation through the eggshells according to claim 1, wherein the fermentation residue obtained by the method for producing the volatile fatty acid through anaerobic fermentation is better in dehydration performance.
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CN114395588A (en) * | 2022-01-14 | 2022-04-26 | 江南大学 | Method for preparing environment-friendly snow melting agent by utilizing kitchen slurry |
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