CN116618415A - Method for preparing high-concentration biomass carbon source by utilizing kitchen waste - Google Patents
Method for preparing high-concentration biomass carbon source by utilizing kitchen waste Download PDFInfo
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- CN116618415A CN116618415A CN202310236189.3A CN202310236189A CN116618415A CN 116618415 A CN116618415 A CN 116618415A CN 202310236189 A CN202310236189 A CN 202310236189A CN 116618415 A CN116618415 A CN 116618415A
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- carbon source
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- kitchen waste
- additive
- biomass carbon
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 62
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 62
- 239000010806 kitchen waste Substances 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title claims abstract description 44
- 239000002028 Biomass Substances 0.000 title claims abstract description 31
- 239000002002 slurry Substances 0.000 claims abstract description 43
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 30
- 239000000654 additive Substances 0.000 claims abstract description 30
- 230000000996 additive effect Effects 0.000 claims abstract description 27
- 230000020477 pH reduction Effects 0.000 claims abstract description 21
- 238000001125 extrusion Methods 0.000 claims abstract description 19
- 229910052742 iron Inorganic materials 0.000 claims abstract description 19
- 238000002360 preparation method Methods 0.000 claims abstract description 12
- 230000003301 hydrolyzing effect Effects 0.000 claims abstract description 10
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 8
- 239000007788 liquid Substances 0.000 claims abstract description 3
- 238000002156 mixing Methods 0.000 claims abstract description 3
- 238000000926 separation method Methods 0.000 claims abstract description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 18
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 10
- VMHLLURERBWHNL-UHFFFAOYSA-M Sodium acetate Chemical compound [Na+].CC([O-])=O VMHLLURERBWHNL-UHFFFAOYSA-M 0.000 claims description 10
- VRIVJOXICYMTAG-IYEMJOQQSA-L iron(ii) gluconate Chemical compound [Fe+2].OC[C@@H](O)[C@@H](O)[C@H](O)[C@@H](O)C([O-])=O.OC[C@@H](O)[C@@H](O)[C@H](O)[C@@H](O)C([O-])=O VRIVJOXICYMTAG-IYEMJOQQSA-L 0.000 claims description 8
- IMWCPTKSESEZCL-SPSNFJOYSA-H (e)-but-2-enedioate;iron(3+) Chemical compound [Fe+3].[Fe+3].[O-]C(=O)\C=C\C([O-])=O.[O-]C(=O)\C=C\C([O-])=O.[O-]C(=O)\C=C\C([O-])=O IMWCPTKSESEZCL-SPSNFJOYSA-H 0.000 claims description 2
- YNVZDODIHZTHOZ-UHFFFAOYSA-K 2-hydroxypropanoate;iron(3+) Chemical compound [Fe+3].CC(O)C([O-])=O.CC(O)C([O-])=O.CC(O)C([O-])=O YNVZDODIHZTHOZ-UHFFFAOYSA-K 0.000 claims description 2
- 239000010865 sewage Substances 0.000 abstract description 20
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 abstract description 19
- 229910052698 phosphorus Inorganic materials 0.000 abstract description 19
- 239000011574 phosphorus Substances 0.000 abstract description 19
- 230000007062 hydrolysis Effects 0.000 abstract description 15
- 238000006460 hydrolysis reaction Methods 0.000 abstract description 15
- -1 iron ions Chemical class 0.000 abstract description 11
- 238000000855 fermentation Methods 0.000 abstract description 10
- 241000894006 Bacteria Species 0.000 abstract description 8
- 230000004151 fermentation Effects 0.000 abstract description 7
- 239000002253 acid Substances 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 239000000203 mixture Substances 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 13
- 239000010813 municipal solid waste Substances 0.000 description 7
- RGHNJXZEOKUKBD-UHFFFAOYSA-N D-gluconic acid Natural products OCC(O)C(O)C(O)C(O)C(O)=O RGHNJXZEOKUKBD-UHFFFAOYSA-N 0.000 description 6
- RGHNJXZEOKUKBD-SQOUGZDYSA-N Gluconic acid Natural products OC[C@@H](O)[C@@H](O)[C@H](O)[C@@H](O)C(O)=O RGHNJXZEOKUKBD-SQOUGZDYSA-N 0.000 description 6
- 239000000174 gluconic acid Substances 0.000 description 6
- 235000012208 gluconic acid Nutrition 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- 150000003839 salts Chemical class 0.000 description 5
- RGHNJXZEOKUKBD-SQOUGZDYSA-M D-gluconate Chemical compound OC[C@@H](O)[C@@H](O)[C@H](O)[C@@H](O)C([O-])=O RGHNJXZEOKUKBD-SQOUGZDYSA-M 0.000 description 4
- CZNVSLGYWMSMKE-OPDGVEILSA-K Ferric gluconate Chemical compound [Fe+3].OC[C@@H](O)[C@@H](O)[C@H](O)[C@@H](O)C([O-])=O.OC[C@@H](O)[C@@H](O)[C@H](O)[C@@H](O)C([O-])=O.OC[C@@H](O)[C@@H](O)[C@H](O)[C@@H](O)C([O-])=O CZNVSLGYWMSMKE-OPDGVEILSA-K 0.000 description 4
- 239000013522 chelant Substances 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 229940050410 gluconate Drugs 0.000 description 4
- 239000010802 sludge Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000005416 organic matter Substances 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- AEQDJSLRWYMAQI-UHFFFAOYSA-N 2,3,9,10-tetramethoxy-6,8,13,13a-tetrahydro-5H-isoquinolino[2,1-b]isoquinoline Chemical compound C1CN2CC(C(=C(OC)C=C3)OC)=C3CC2C2=C1C=C(OC)C(OC)=C2 AEQDJSLRWYMAQI-UHFFFAOYSA-N 0.000 description 2
- VTLYFUHAOXGGBS-UHFFFAOYSA-N Fe3+ Chemical compound [Fe+3] VTLYFUHAOXGGBS-UHFFFAOYSA-N 0.000 description 2
- 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
- 235000014113 dietary fatty acids Nutrition 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000194 fatty acid Substances 0.000 description 2
- 229930195729 fatty acid Natural products 0.000 description 2
- 150000004665 fatty acids Chemical class 0.000 description 2
- 229910001447 ferric ion Inorganic materials 0.000 description 2
- 239000008103 glucose Substances 0.000 description 2
- 229910017053 inorganic salt Inorganic materials 0.000 description 2
- 229920002521 macromolecule Polymers 0.000 description 2
- 230000000813 microbial effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000001546 nitrifying effect Effects 0.000 description 2
- 235000016709 nutrition Nutrition 0.000 description 2
- 230000035764 nutrition Effects 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000000176 sodium gluconate Substances 0.000 description 2
- 235000012207 sodium gluconate Nutrition 0.000 description 2
- 229940005574 sodium gluconate Drugs 0.000 description 2
- 239000002910 solid waste Substances 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- 239000005955 Ferric phosphate Substances 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 150000008064 anhydrides Chemical class 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-N carbonic acid Chemical compound OC(O)=O BVKZGUZCCUSVTD-UHFFFAOYSA-N 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 230000009920 chelation Effects 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 238000009264 composting Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000029087 digestion Effects 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 229940032958 ferric phosphate Drugs 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- FBAFATDZDUQKNH-UHFFFAOYSA-M iron chloride Chemical compound [Cl-].[Fe] FBAFATDZDUQKNH-UHFFFAOYSA-M 0.000 description 1
- WBJZTOZJJYAKHQ-UHFFFAOYSA-K iron(3+) phosphate Chemical compound [Fe+3].[O-]P([O-])([O-])=O WBJZTOZJJYAKHQ-UHFFFAOYSA-K 0.000 description 1
- 229910000399 iron(III) phosphate Inorganic materials 0.000 description 1
- 230000007269 microbial metabolism Effects 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 150000002891 organic anions Chemical class 0.000 description 1
- 239000011146 organic particle Substances 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 238000000053 physical method Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 150000004666 short chain fatty acids Chemical class 0.000 description 1
- 229910001415 sodium ion Inorganic materials 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000009279 wet oxidation reaction Methods 0.000 description 1
Classifications
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- 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
- B09B3/30—Destroying solid waste or transforming solid waste into something useful or harmless involving mechanical treatment
- B09B3/35—Shredding, crushing or cutting
-
- 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
- B09B3/30—Destroying solid waste or transforming solid waste into something useful or harmless involving mechanical treatment
- B09B3/32—Compressing or compacting
-
- 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
- B09B3/60—Biochemical treatment, e.g. by using enzymes
- B09B3/65—Anaerobic treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B5/00—Operations not covered by a single other subclass or by a single other group in this subclass
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B2101/00—Type of solid waste
- B09B2101/70—Kitchen refuse; Food waste
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/105—Phosphorus compounds
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Biochemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a preparation method of a high-concentration biomass carbon source for kitchen waste. Crushing and sorting kitchen waste, and then performing screw extrusion to obtain organic slurry; mixing the organic slurry with the additive, sequentially carrying out hydrolytic acidification and solid-liquid separation to obtain the organic slurry; the additive is an organic iron slow release agent. According to the method, the relative abundance of acid fermentation bacteria in the hydrolysis acidification production stage is improved by adding the additive, the hydrolysis acidification of macromolecular organic matters in the organic slurry is promoted, meanwhile, the iron ions in the additive can remove the phosphorus content in the slurry mixture, an additional dephosphorization process is not needed, and the use load of a carbon source on a biochemical pool of a sewage plant is reduced. The high-concentration biomass carbon source prepared by the method has stable property and moderate salinity, and can meet the requirements of carbon sources in the sewage treatment process.
Description
Technical Field
The invention relates to a biomass carbon source, in particular to a preparation method of a kitchen waste high-concentration biomass carbon source, and belongs to the field of environmental engineering.
Background
The countries push household garbage classification to encourage individual treatment of kitchen wastes and other perishable garbage. Kitchen waste is used as an important component of urban solid waste, and has huge yield and rising trend year by year. At present, common treatment modes for kitchen waste comprise: anaerobic digestion to produce biogas, aerobic composting, saprophyte cultivation, etc. Although the kitchen waste has high organic matter content and can be recycled by adopting the microbial technology for treatment, the kitchen waste has low economic value due to the characteristics of low oil content, high water content and the like in the urban kitchen waste, and the anaerobic or aerobic technology treatment of the kitchen waste is caused, so that the construction investment and the operation cost of a water treatment link at the rear end are increased. On the other hand, in the process of treating low-concentration domestic sewage in a domestic sewage plant, due to insufficient carbon source of the inlet water, the nitrifying property of the sewage is low, the denitrification efficiency of the sewage is affected, and the sewage treatment effect is poor. The sewage plant often needs to add an additional carbon source into the sewage, and also needs to reduce sludge discharge and increase the sludge age of nitrifying bacteria and denitrifying bacteria under a low-temperature environment, so that the denitrification efficiency is improved, and finally, the sewage quality is ensured to meet the relevant emission standards. The organic slurry of the kitchen waste after pretreatment often contains a large amount of organic matters, so that the kitchen waste has a certain feasibility as a carbon source of a sewage plant, but the application of the kitchen waste serving as the carbon source in the sewage treatment process is limited due to the characteristics of more solid organic matters, low content of soluble carbon source, high oil and high salt, high total soluble phosphorus and the like in the slurry in the use process. Based on the above, development of a method for preparing a biomass carbon source with high concentration and suitable for sewage plants by utilizing kitchen waste is urgent, and technical innovation of the sewage plants and the kitchen waste plants is promoted.
At present, more researches are related to preparing carbon sources by utilizing organic solid wastes such as kitchen waste, municipal sludge and the like, and the method is often focused on improving the dissolution of granular organic matters by adopting a chemical or physical method and improving the concentration of soluble carbon sources. Common strengthening methods include: the method usually needs to add a large amount of chemical agents, such as a large amount of NaOH for adjusting the pH value to 10 by a hot alkali method in China patent (CN.107265806), so that the carbon source has high salt content and high conductivity, and the kitchen waste have high salt content per se at present, the salt is not easy to be excessively introduced, so that the method for preparing the carbon source is not suitable for the use requirement of a denitrification tank of a sewage plant; chinese patent (cn.112495982) provides a method for converting kitchen waste into wastewater denitrification carbon source by catalytic wet oxidation, which requires a lot of energy consumption, so that such preparation method has cost limitation in engineering application. Besides, the total phosphorus removal efficiency is reduced while sludge discharge is reduced in the existing sewage plant, and the carbon source prepared by adopting the organic solid waste is often required to be subjected to a dephosphorization step in advance in the sewage plant before application (lisven, lu Jianyu, liu Ying, fenton-MAP method combined treatment of kitchen waste and wastewater to extract a soluble carbon source [ J ]. Modern chemical research, 2022.10). Therefore, there is a need in the market today for a low-cost, high-quality and highly practical method for preparing biomass carbon sources, which meets the operation requirements of carbon sources in the denitrification process of sewage plants.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention aims to provide a preparation method of a high-concentration biomass carbon source for kitchen waste, which is based on the physicochemical characteristics of complex kitchen waste components, high organic matter content, low oil content and the like, organic slurry is obtained through crushing, sorting and spiral extrusion, and the hydrolytic acidification process of the organic slurry is enhanced by an additive, so that the phosphorus content in the carbon source is reduced, and meanwhile, new salt ions are not introduced, and the practical application limit of the carbon source is reduced.
In order to achieve the technical aim, the invention provides a preparation method of a kitchen waste high-concentration biomass carbon source, which comprises the steps of crushing and sorting kitchen waste, and then performing screw extrusion to obtain organic slurry; mixing the organic slurry with the additive, sequentially carrying out hydrolytic acidification and solid-liquid separation to obtain the organic slurry; the additive is an organic iron slow release agent.
In the preparation method adopted by the invention, kitchen waste is taken as a raw material, homogenized organic slurry is obtained through sorting and extrusion, and additives are added before hydrolysis and acidification, so that the additives are helpful for converting organic macromolecules into micromolecular compounds and fatty acid substances on one hand, and can be chelated with free phosphorus in the organic slurry for precipitation on the other hand, so that the total phosphorus content in a carbon source is reduced, and the stability and applicability of a biomass carbon source are improved.
As a preferred embodiment, the additive is one of iron gluconate, iron fumarate and iron lactate. The additive adopted by the invention is an organic iron ion slow release agent, wherein organic anions comprise carbon, hydrogen and oxygen elements, the slow release agent can be combined with phosphorus in organic slurry by utilizing the chelation of iron ions on one hand, so as to reduce the total phosphorus content in biomass carbon sources, and on the other hand, the slow release agent can be used as a high-quality supplementary carbon source, and can not improve the carbonic acid salinity of biomass after hydrolysis and acidification, thereby being convenient for subsequent use.
As a preferred embodiment, the conditions of the screw extrusion process are: the extrusion pressure is 5-10 MPa, and the aperture of the screen is 4-8 mm.
As a preferred scheme, the TCOD of the organic slurry is 80-120 g/L, TS is 60-100 g/L, and VS is 50-80 g/L.
As a preferred embodiment, the additive is iron gluconate. The ferric gluconate adopted by the invention is a ferric gluconate chelate slow release agent, and the ferric ions are directly added in the anaerobic process, so that the reaction rate of the ferric gluconate chelate slow release agent and inorganic salt is high, and the slow release characteristic of the ferric gluconate can avoid the combination of the ferric ions and the inorganic salt, thereby improving the utilization rate of ferric salt in microbial metabolism. The iron ions are slowly released by utilizing the gluconic acid chelated iron to act on hydrolytic bacteria to serve as waterThe nutrition substances of the degerming are enriched, the abundance of the degerming nutrition substances in bacteria in the hydrolysis acidification tank is improved to 45-50%, the decomposition of organic particles or macromolecules into soluble micromolecular organic matters is promoted, and meanwhile, glucose anhydride is easily degraded into micromolecular acid by the hydrolysis acidification bacteria, so that the release concentration of short-chain fatty acid in slurry is greatly improved. Further, the iron ions in the iron gluconate can be combined with PO 4 3- And forming ferric phosphate precipitate, removing inorganic phosphorus in the slurry, taking gluconate as organic anhydride, and taking the gluconate as a carbon source to improve the carbon content in the organic slurry, so that the hydrolysis acidification stage of kitchen waste can be enhanced by adopting the gluconate chelated iron, and a high-concentration biomass carbon source is obtained.
As a preferable scheme, the ratio of the addition amount of the additive to the TS content in the organic slurry is 2-6 g/kg TS. Because the combination rate of iron ions and phosphate is high, when the addition amount of the additive is low, slow release iron cannot act on microorganisms, so that the purpose of enhancing acid production is achieved; under the condition of adding excessive additives, the method has small effect of improving the release concentration of fatty acid, and excessive iron ions are easy to remain in the preparation of carbon source products, so that the use value of the carbon source is reduced, and the preparation cost is increased.
As a preferred embodiment, the conditions of hydrolytic acidification are: the temperature is 30-40 ℃, the pH is 6.5-8.5, and the time is 3-7 d.
As a preferred embodiment, the hydrolytically acidified pH adjustor is hydrochloric acid/sodium hydroxide.
As a preferable scheme, the concentration of the hydrochloric acid is 1.5-2.5M; the concentration of the sodium hydroxide is 4-6M.
As a preferable scheme, the SCOD of the biomass carbon source is 60-100 g/L, the SCFA concentration is 20-60 g/L, and the TP concentration is 5-60 mg/L.
Compared with the prior art, the technical scheme of the invention has the beneficial technical effects that:
1) According to the biomass carbon source preparation method provided by the invention, based on the physicochemical characteristics of complex kitchen waste components, high organic matter content, low oil content and the like, the organic slurry is obtained through crushing, sorting and spiral extrusion, and the hydrolysis and acidification process of the organic slurry are enhanced by the additive, so that the phosphorus content in the carbon source is reduced, new salt ions are not introduced, and the practical application limit of the carbon source is reduced.
2) According to the technical scheme provided by the invention, the hydrolysis and acidification process of the kitchen waste organic slurry is enhanced by adopting the additive, so that the hydrolysis and acidification of organic matters in the organic slurry are promoted, meanwhile, the gluconic acid can be also used as a carbon source to be rapidly decomposed into micromolecular acid through hydrolytic bacteria, and the concentration of the effective biomass carbon source in the effluent is finally improved.
3) According to the technical scheme provided by the invention, the gluconic acid chelated iron is used as an additive to promote the chemical dephosphorization process, the phosphorus content in the effluent is reduced, the phosphorus removal load of a biochemical tank is prevented from being increased in the subsequent sewage plant application process when a carbon source is prepared, the obtained biomass carbon source has stable property and moderate salinity, and the feasibility of using the kitchen waste organic slurry as the carbon source in the biochemical tank of the domestic sewage plant is greatly improved.
Drawings
Fig. 1 is a process flow diagram of preparing a high-concentration biomass carbon source by utilizing kitchen waste.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the present invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications could be made by those skilled in the art without departing from the inventive concept. These are all within the scope of the present invention.
Example 1
The embodiment relates to a method for preparing a high-concentration biomass carbon source by utilizing kitchen waste, wherein a process flow chart is shown in fig. 1, and the method specifically comprises the following steps:
a certain garbage treatment plant in Hunan is characterized in that kitchen garbage which is collected and transported is crushed and sieved and then enters screw extrusion, the extrusion pressure is controlled to be 5MPa, the aperture of an extrusion screen is 4mm, the TCOD (total oxygen demand) of slurry after extrusion is 80g/L, the TP concentration is 280mg/L, the TS (total residue solid) is 60g/L, and the VS (volatile solid) is 50g/L. When the slurry is conveyed to a hydrolysis acidification tank, the added amount of the gluconic acid chelated iron solution is 2g/kgTS (namely 0.12 g/L). The slurry enters a hydrolysis acidification tank and is uniformly stirred, the pH is controlled to be 6.5 by adopting 5M sodium hydroxide and 2M hydrochloric acid solution, the reaction temperature is controlled to be 35 ℃, the fermentation time is 3d, the SCOD (SCFA) concentration of the slurry produced after fermentation is 60g/L, the SCFA concentration is 20g/L, and the TP concentration is 60mg/L.
Example 2
The embodiment relates to a method for preparing a high-concentration biomass carbon source by utilizing kitchen waste, which specifically comprises the following steps:
crushing and screening kitchen waste in a waste treatment plant in Hunan, and then feeding the kitchen waste into screw extrusion, wherein the extrusion pressure is controlled at 7.5MPa, the aperture of an extrusion screen is 6mm, the TCOD (total internal diameter) of extruded slurry is 100g/L, the TP concentration is 320mg/L, the TS is 80g/L, and the VS is 65g/L. The addition amount of the gluconic acid chelated iron solution is 4g/kgTS (namely 0.32 g/L). The slurry enters a hydrolysis acidification tank and is uniformly stirred, the pH is controlled at 6.5, the reaction temperature is controlled at 35 ℃, the fermentation time is 7d, the SCOD of the slurry produced after fermentation is 80g/L, the concentration of SCFA is 40g/L, and the concentration of TP is 35mg/L.
Example 3
The embodiment relates to a method for preparing a high-concentration biomass carbon source by utilizing kitchen waste, which specifically comprises the following steps:
the kitchen garbage enters a garbage treatment plant in Hunan, the extrusion pressure is controlled to be 10MPa, the aperture of an extrusion screen is 8mm, the TCOD of the extruded slurry is 120g/L, the TP concentration is 360mg/L, the TS is 100g/L, and the VS is 80g/L. The addition amount of the gluconic acid chelated iron solution is 6g/kgTS (namely 0.6 g/L). The slurry enters a hydrolysis acidification tank and is uniformly stirred, the pH is controlled at 7.5, the reaction temperature is controlled at 35 ℃, the fermentation time is 5d, the SCOD (stream control unit) of the slurry produced after fermentation is 100g/L, the concentration of SCFA (SCFA) is 60g/L, and the concentration of TP (stream control) is 5mg/L.
Comparative example 1
The procedure of this comparative example was exactly the same as that of comparative example 1, except that no iron gluconate chelate additive was added, the final post-fermentation slurry SCOD was only 40g/L, the SCFA concentration was 12g/L, and the TP concentration was 350mg/L.
Comparative example 2
The procedure of this comparative example was exactly the same as that of comparative example 1, except that sodium gluconate was used as an additive, the addition amount was 2.04g/kg TS (the molar number of glucose was the same as that of iron gluconate), the final post-fermentation slurry SCOD was 42g/L only, the SCFA concentration was 15g/L, and the TP concentration was 350mg/L.
Comparative example 3
The procedure of this comparative example was exactly the same as that of comparative example 1, except that iron chloride was used as an additive, and the addition amount was 0.5g/kg TS (the number of moles of iron ions was the same as that of the iron gluconate chelate), and the final post-fermentation slurry SCOD was only 30g/L, SCFA concentration was 12g/L, and TP concentration was 20mg/L.
According to the embodiment 1-3, along with the increase of the concentration of the additive, the total phosphorus content in the effluent is greatly reduced on the premise of ensuring the concentration of the effective carbon source, which indicates that the preparation method provided by the invention can realize the removal of total phosphorus without a phosphorus removal step; as is clear from comparative example 1 and example 1, the SCOD value is reduced by 33.3% without the additive, the total phosphorus content in the effluent is substantially the same as the original content, the effective concentration of the carbon source is reduced, while in comparative example 2, although sodium gluconate is used as the additive, the SCOD value is slightly improved compared with comparative example 1, but the total phosphorus content in the effluent is still higher, because gluconate is used as the supplementary carbon source to improve the SCOD value of the effluent, but sodium ions cannot participate in the hydrolysis process of hydrolytic bacteria and cannot form precipitates with free phosphorus; in comparative example 3, inorganic iron additive is adopted to inhibit total phosphorus in effluent, but the SCOD content is lower, and the total salinity of the effluent is too high due to the introduction of a large amount of Cl ions, so that the microbial reproduction in subsequent use is not facilitated.
The foregoing describes specific embodiments of the present invention. It is to be understood that the invention is not limited to the particular embodiments described above, and that various changes and modifications may be made by one skilled in the art within the scope of the claims without affecting the spirit of the invention.
Claims (8)
1. A preparation method of a kitchen waste high-concentration biomass carbon source is characterized by comprising the following steps: crushing and sorting kitchen waste, and then performing screw extrusion to obtain organic slurry; mixing the organic slurry with the additive, sequentially carrying out hydrolytic acidification and solid-liquid separation to obtain the organic slurry; the additive is an organic iron slow release agent.
2. The method for preparing the high-concentration biomass carbon source for kitchen waste, as claimed in claim 1, is characterized by comprising the following steps: the additive is one of iron gluconate, iron fumarate and iron lactate.
3. The method for preparing the high-concentration biomass carbon source for kitchen waste, as claimed in claim 1, is characterized by comprising the following steps: the conditions of the screw extrusion process are as follows: the extrusion pressure is 5-10 MPa, and the aperture of the screen is 4-8 mm.
4. The preparation method of the kitchen waste high-concentration biomass carbon source according to claim 1 or 2, which is characterized by comprising the following steps: the TCOD of the organic slurry is 80-120 g/L, the TP concentration is 280-360 mg/L, TS is 60-100 g/L, and VS is 50-80 g/L.
5. The method for preparing the high-concentration biomass carbon source for kitchen waste, as claimed in claim 4, is characterized in that: the additive is iron gluconate; the ratio of the addition amount of the additive to the TS content in the organic slurry is 2-6 g/kg TS.
6. The method for preparing the high-concentration biomass carbon source for kitchen waste, as claimed in claim 1, is characterized by comprising the following steps: the conditions of the hydrolytic acidification are as follows: the temperature is 30-40 ℃, the pH is 6.5-8.5, and the time is 3-7 d.
7. The method for preparing the high-concentration biomass carbon source for kitchen waste, as claimed in claim 6, is characterized in that: the pH regulator for hydrolytic acidification is hydrochloric acid/sodium hydroxide; the concentration of the hydrochloric acid is 1.5-2.5M; the concentration of the sodium hydroxide is 4-6M.
8. The method for preparing the high-concentration biomass carbon source for kitchen waste, as claimed in claim 1, is characterized by comprising the following steps: the SCOD of the biomass carbon source is 60-100 g/L, the concentration of SCFA is 20-60 g/L, and the concentration of TP is 5-60 mg/L.
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| CN117757630A (en) * | 2023-12-21 | 2024-03-26 | 长沙大旗至诚环保科技有限公司 | Method for preparing composite bacterial carbon source by utilizing kitchen waste, composite bacterial carbon source and application |
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| CN117757630A (en) * | 2023-12-21 | 2024-03-26 | 长沙大旗至诚环保科技有限公司 | Method for preparing composite bacterial carbon source by utilizing kitchen waste, composite bacterial carbon source and application |
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