CN116116871B - A multi-stage recovery system and method for usable oil in kitchen waste - Google Patents
A multi-stage recovery system and method for usable oil in kitchen waste Download PDFInfo
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- CN116116871B CN116116871B CN202211717982.7A CN202211717982A CN116116871B CN 116116871 B CN116116871 B CN 116116871B CN 202211717982 A CN202211717982 A CN 202211717982A CN 116116871 B CN116116871 B CN 116116871B
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- 239000010806 kitchen waste Substances 0.000 title claims abstract description 90
- 238000011084 recovery Methods 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title claims abstract description 20
- 239000004519 grease Substances 0.000 claims abstract description 15
- 238000004064 recycling Methods 0.000 claims description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- 238000000926 separation method Methods 0.000 claims description 13
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 9
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 claims description 9
- 238000009283 thermal hydrolysis Methods 0.000 claims description 7
- 238000000605 extraction Methods 0.000 claims description 6
- 239000002798 polar solvent Substances 0.000 claims description 5
- 239000007790 solid phase Substances 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 3
- 230000003301 hydrolyzing effect Effects 0.000 claims description 3
- 238000005868 electrolysis reaction Methods 0.000 claims description 2
- 230000003068 static effect Effects 0.000 claims 2
- 238000002955 isolation Methods 0.000 claims 1
- 230000008901 benefit Effects 0.000 abstract description 4
- 238000001027 hydrothermal synthesis Methods 0.000 abstract description 4
- 239000003921 oil Substances 0.000 description 66
- 239000002699 waste material Substances 0.000 description 5
- 239000002028 Biomass Substances 0.000 description 4
- 239000003225 biodiesel Substances 0.000 description 4
- 239000012071 phase Substances 0.000 description 4
- 239000007788 liquid Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000005188 flotation Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- WRIDQFICGBMAFQ-UHFFFAOYSA-N (E)-8-Octadecenoic acid Natural products CCCCCCCCCC=CCCCCCCC(O)=O WRIDQFICGBMAFQ-UHFFFAOYSA-N 0.000 description 1
- LQJBNNIYVWPHFW-UHFFFAOYSA-N 20:1omega9c fatty acid Natural products CCCCCCCCCCC=CCCCCCCCC(O)=O LQJBNNIYVWPHFW-UHFFFAOYSA-N 0.000 description 1
- QSBYPNXLFMSGKH-UHFFFAOYSA-N 9-Heptadecensaeure Natural products CCCCCCCC=CCCCCCCCC(O)=O QSBYPNXLFMSGKH-UHFFFAOYSA-N 0.000 description 1
- ZQPPMHVWECSIRJ-UHFFFAOYSA-N Oleic acid Natural products CCCCCCCCC=CCCCCCCCC(O)=O ZQPPMHVWECSIRJ-UHFFFAOYSA-N 0.000 description 1
- 239000005642 Oleic acid Substances 0.000 description 1
- 235000021355 Stearic acid Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000012075 bio-oil Substances 0.000 description 1
- 210000000988 bone and bone Anatomy 0.000 description 1
- -1 bones Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004945 emulsification Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- 239000010794 food waste Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- QXJSBBXBKPUZAA-UHFFFAOYSA-N isooleic acid Natural products CCCCCCCC=CCCCCCCCCC(O)=O QXJSBBXBKPUZAA-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000006396 nitration reaction Methods 0.000 description 1
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 1
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 1
- ZQPPMHVWECSIRJ-KTKRTIGZSA-N oleic acid Chemical compound CCCCCCCC\C=C/CCCCCCCC(O)=O ZQPPMHVWECSIRJ-KTKRTIGZSA-N 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000000638 solvent extraction Methods 0.000 description 1
- 239000008117 stearic acid Substances 0.000 description 1
Classifications
-
- 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
- B09B3/40—Destroying solid waste or transforming solid waste into something useful or harmless involving thermal treatment, e.g. evaporation
-
- 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
- B09B3/70—Chemical treatment, e.g. pH adjustment or oxidation
-
- 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
-
- 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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/74—Recovery of fats, fatty oils, fatty acids or other fatty substances, e.g. lanolin or waxes
Landscapes
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention relates to the field of kitchen waste treatment, in particular to a multistage recovery system and a multistage recovery method for usable oil in kitchen waste, which are characterized in that after the kitchen waste in a storage tank is crushed, multistage hydrothermal reactors are sequentially arranged, so that the multiple reactors realize the classification treatment of the kitchen waste, the oil phase in the kitchen waste is thoroughly separated step by step, the method has the advantages that the available oil in the kitchen waste can be sequentially extracted through each stage, the available oil extracted from each stage is recycled, the recovery rate of the available oil in the kitchen waste is greatly improved, different oil phases are separated step by step through the hydrothermal reaction, the kitchen waste is helped to thoroughly remove grease, and the economic benefit of kitchen waste treatment is improved.
Description
Technical Field
The invention relates to the field of kitchen waste treatment, in particular to a multistage recovery system and a multistage recovery method for available oil in kitchen waste.
Background
With the rapid development of social economy and the improvement of living standard of people in China, the kitchen waste production is increased day by day, and the kitchen waste has become an important pollution source affecting the living environment. The kitchen waste has complex components, is a mixture of various substances such as oil, bones, waste tableware, plastics and the like, has the characteristics of high grease content, more organic matters and impurities and the like, and can change waste into valuable if effectively and reasonably utilized and treated, and relieve the pollution pressure of the kitchen waste to the environment.
In general, the biological oil in the food waste can account for 1-3% of the total weight of the waste, and can be as high as about 10%. The biological oil contained in the kitchen waste is a high-quality raw material for producing chemical products such as biodiesel, stearic acid, oleic acid and the like. The kitchen waste biomass in urban areas of China can produce more than 398 ten thousand tons of biodiesel per year, and if the kitchen waste biomass is fully utilized, the problem of capacity of biodiesel enterprises can be solved, the harm caused by backflow of the kitchen waste biomass into dining tables can be eliminated, and the kitchen waste biomass has high recycling value.
Because the kitchen waste in China is relatively late in treatment and starting, the defects of simple process, small treatment capacity, high equipment failure rate and the like exist, and the solid-phase internal grease of the kitchen waste is relatively difficult to separate and has relatively high content. At present, the waste grease generated in the theory of kitchen waste in China is over 1100 ten thousand tons, but the waste grease actually enters the biodiesel industry chain, and is less than 200 ten thousand tons each year. Meanwhile, the existing grease extraction treatment method comprises the steps of heating filtrate through a heater, quantitatively and uniformly flowing into a horizontal centrifuge for solid-liquid separation, heating the separated grease-containing liquid again, and then enabling the liquid to enter a vertical centrifuge for oil-water separation, so that grease with higher purity is finally obtained. However, the method has low oil extraction rate, and only floatable oil in kitchen waste can be separated. Other dissolved oil in the kitchen waste cannot be separated. And the high flow rate can cause serious secondary emulsification to the oily wastewater due to the high-speed rotation of the centrifuge.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide a multistage recovery system and a multistage recovery method for available oil in kitchen waste, so as to solve the technical problem of low recovery rate of the available oil in the kitchen waste in the prior art.
The invention is realized by the following technical scheme:
The multi-stage recovery system for the usable oil in the kitchen waste comprises a storage tank, a crushing and sorting device, a first-stage hydrothermal reactor, a second-stage hydrothermal reactor, a third-stage hydrothermal reactor and a tail water treatment device, wherein the output end of the storage tank is connected with the input end of the crushing and sorting device, the output end of the crushing and sorting device is connected with the input end of the first-stage hydrothermal reactor, the output end of the first-stage hydrothermal reactor is connected with the input end of the second-stage hydrothermal reactor, the output end of the second-stage hydrothermal reactor is connected with the input end of the third-stage hydrothermal reactor, and the output end of the third-stage hydrothermal reactor is connected with the tail water treatment device.
Preferably, a first delivery pump is arranged between the output end of the crushing and sorting device and the input end of the primary hydrothermal reactor.
Preferably, an oil separation device and a second delivery pump are sequentially arranged between the output end of the primary hydrothermal reactor and the input end of the secondary hydrothermal reactor.
Preferably, a gas dissolving device and a third delivery pump are sequentially arranged between the output end of the secondary hydrothermal reactor and the input end of the tertiary hydrothermal reactor.
Preferably, a separation device and a fourth delivery pump are sequentially arranged between the three-stage hydrothermal reactor and the tail water treatment device.
A multistage recovery method of available oil in kitchen waste is based on the multistage recovery system of available oil in kitchen waste, comprising the following steps:
Step 1, kitchen waste enters a storage tank from an inlet of the storage tank, enters a crushing and sorting device through the storage tank, and breaks and separates solid-phase products insoluble in water in the kitchen waste;
Step 2, the crushed and sorted kitchen waste enters a primary hydrothermal reactor and is stationary, and floatable oil is separated out for recycling;
Step 3, hydrolyzing the kitchen waste by a secondary hydrothermal reactor 7, separating out grease and recycling the grease;
And 4, separating out biological oil from the kitchen waste after high-temperature thermal hydrolysis in the three-stage hydrothermal reactor for recycling.
Preferably, in the step 2, after the kitchen waste is stationary below 80 ℃ in the primary hydrothermal reactor, the kitchen waste is discharged through an oil collecting pipe by an oil separating device, skimmed by a skimming machine or manually skimmed, and floatable oil is separated for recycling.
Preferably, in the step 3, the kitchen waste is hydrolyzed for 30-60 minutes at low temperature of 80-200 ℃ and 0.5-2MPa in a secondary hydrothermal reactor, then enters a gas dissolving device, is pressurized after being added with air, is electrolyzed by installing a direct current electrode or is subjected to impeller air flotation and jet air flotation to generate bubbles to adhere oil with the density similar to that of the bubbles, and moves upwards gradually, and finally, oil is separated out for recycling.
Preferably, in the step 4, the kitchen waste is subjected to high-temperature thermal hydrolysis for 30-80 minutes at 260-320 ℃ and 7-20MPa in a three-stage hydrothermal reactor, and the biological oil is separated out for recycling by adding a strong polar solvent for extraction after filtering in a separating device.
Preferably, toluene or diethyl ether is used as the strongly polar solvent.
Compared with the prior art, the invention has the following beneficial technical effects:
The invention provides a multistage recovery system for available oil in kitchen waste, which is characterized in that kitchen waste in a storage tank is crushed and then sequentially provided with multistage hydrothermal reactors, so that the multiple reactors realize the grading treatment of the kitchen waste, oil phases in the kitchen waste are thoroughly separated step by step, the available oil in the kitchen waste can be sequentially extracted through each stage, the available oil extracted from each stage is recycled, the recovery rate of the available oil in the kitchen waste is greatly improved, different oil phases are separated step by step through hydrothermal reaction, the kitchen waste is helped to thoroughly remove the oil, and the economic benefit of kitchen waste treatment is improved.
Further, a first conveying pump is arranged between the output end of the crushing and sorting device and the input end of the primary hydrothermal reactor, so that kitchen waste passing through the crushing and sorting device can be conveyed into the primary hydrothermal reactor through the first conveying pump, and primary available oil is extracted from the kitchen waste.
Further, an oil separation device and a second conveying pump are sequentially arranged between the output end of the primary hydrothermal reactor and the input end of the secondary hydrothermal reactor, so that kitchen waste passing through the primary hydrothermal reactor can be conveyed into the secondary hydrothermal reactor through the oil separation device and the second conveying pump, and secondary available oil is extracted from the kitchen waste.
Further, a gas dissolving device and a third conveying pump are sequentially arranged between the output end of the secondary hydrothermal reactor and the input end of the tertiary hydrothermal reactor, so that kitchen waste passing through the secondary hydrothermal reactor can be conveyed into the tertiary hydrothermal reactor through the gas dissolving device and the third conveying pump, and the kitchen waste is subjected to tertiary available oil extraction.
The invention also provides a multistage recovery method of the available oil in the kitchen waste, which extracts the available oil from the kitchen waste through multistage hydrothermal reaction, and each hydrothermal reactor is provided with different reaction temperatures, reaction pressures and reaction times, so that different oils are separated in multiple stages for recovery and utilization, and the recovery rate of the available oil in the kitchen waste is greatly improved.
Drawings
FIG. 1 is a schematic diagram of a multi-stage bio-oil recovery system according to the present invention.
In the figure, a 1-storage tank, a 2-crushing and sorting device, a 3-first conveying pump, a 4-first-stage hydrothermal reactor, a 5-oil separation device, a 6-second conveying pump, a 7-second-stage hydrothermal reactor, an 8-gas dissolving device, a 9-third conveying pump, a 10-third-stage hydrothermal reactor, a 11-separating device, a 12-fourth conveying pump and a 13-tail water treatment device are arranged.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The invention is described in further detail below with reference to the attached drawing figures:
The invention aims to provide a multistage recovery system and a multistage recovery method for available oil in kitchen waste, which are used for solving the technical problem of low recovery rate of the available oil in the kitchen waste in the prior art.
Specifically, according to the multi-stage recovery system shown in fig. 1, the multi-stage recovery system for the available oil in the kitchen waste comprises a storage tank 1, a crushing and sorting device 2, a first-stage hydrothermal reactor 4, a second-stage hydrothermal reactor 7, a third-stage hydrothermal reactor 10 and a tail water treatment device 13, wherein the output end of the storage tank 1 is connected with the input end of the crushing and sorting device 2, the output end of the crushing and sorting device 2 is connected with the input end of the first-stage hydrothermal reactor 4, the output end of the first-stage hydrothermal reactor 4 is connected with the input end of the second-stage hydrothermal reactor 7, the output end of the second-stage hydrothermal reactor 7 is connected with the input end of the third-stage hydrothermal reactor 10, and the output end of the third-stage hydrothermal reactor 10 is connected with the tail water treatment device 13.
Specifically, a first transfer pump 3 is disposed between the output end of the crushing and sorting device 2 and the input end of the primary hydrothermal reactor 4.
Specifically, an oil separation device 5 and a second delivery pump 6 are sequentially arranged between the output end of the primary hydrothermal reactor 4 and the input end of the secondary hydrothermal reactor 7.
Specifically, a gas dissolving device 8 and a third delivery pump 9 are sequentially arranged between the output end of the secondary hydrothermal reactor 7 and the input end of the tertiary hydrothermal reactor 10.
Specifically, a separation device 11 and a fourth delivery pump 12 are sequentially arranged between the three-stage hydrothermal reactor 10 and the tail water treatment device 13.
The invention also provides a multistage recovery method of the available oil in the kitchen waste, which is based on the multistage recovery system of the available oil in the kitchen waste, and comprises the following steps:
Step 1, kitchen waste enters a storage tank 1 from an inlet of the storage tank 1, enters a crushing and sorting device 2 through the storage tank 1, and breaks and separates solid-phase products insoluble in water in the kitchen waste;
Step 2, the crushed and sorted kitchen waste enters a first-stage hydrothermal reactor 4 and is stationary, and floatable oil is separated out for recycling;
Step 3, hydrolyzing the kitchen waste by a secondary hydrothermal reactor 7, separating out grease and recycling the grease;
And 4, separating out biological oil from the kitchen waste after high-temperature thermal hydrolysis in the three-stage hydrothermal reactor 10 for recycling.
Specifically, after the kitchen waste is stationary below 80 ℃ in the primary hydrothermal reactor 4, the kitchen waste is discharged through an oil collecting pipe by utilizing an oil separating device 5, skimmed by a skimming machine or manually skimmed, and floatable oil is separated for recycling.
Specifically, kitchen waste is subjected to low-temperature thermal hydrolysis for 30-60 minutes at 80-200 ℃ and 0.5-2MPa in a secondary hydrothermal reactor 7, then enters a gas dissolving device 8, is pressurized after air is added, is electrolyzed by installing a direct current electrode or is subjected to impeller air floatation and jet air floatation to generate bubbles to adhere oil with the density similar to that of the bubbles, and moves upwards gradually, and finally oil is separated out for recycling.
Specifically, kitchen waste is subjected to high-temperature thermal hydrolysis for 30-80 minutes at 260-320 ℃ and 7-20MPa in the three-stage hydrothermal reactor 10, and biological oil is separated out for recycling by adding a strong polar solvent for extraction after filtering in a separation device.
Specifically, the oil separating device 5 obtains floatable oil through skimming by special machinery such as an oil collecting pipe or manual skimming, the oil dissolving device 8 separates grease through an air floatation method, the separation device 11 separates biological oil through solvent extraction, the oil separating device 5 comprises but not limited to a horizontal flow oil separating tank and the like, the air dissolving device 8 comprises but not limited to devices such as pressurization, electrolysis or jet air floatation, the solvent added into the separation device 11 comprises but not limited to toluene, diethyl ether and the like, and the tail water treatment device 10 comprises but not limited to a wastewater biological treatment device, an anaerobic nitration device, an MBR device and the like.
In summary, the invention provides a multistage recovery system for the usable oil in the kitchen waste, which is characterized in that after the kitchen waste in a storage tank is crushed, multistage hydrothermal reactors are sequentially arranged, so that the multiple reactors realize the grading treatment of the kitchen waste, the oil phase in the kitchen waste is thoroughly separated step by step, the usable oil in the kitchen waste can be sequentially extracted through each stage, the usable oil extracted from each stage is recycled, the recovery rate of the usable oil in the kitchen waste is greatly improved, different oil phases are separated step by step through the hydrothermal reaction, the kitchen waste is helped to thoroughly remove the grease, and the economic benefit of the kitchen waste treatment is improved.
Finally, it should be noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made to the specific embodiments of the present invention without departing from the spirit and scope of the present invention, and any modifications and equivalents are intended to be included in the scope of the claims of the present invention.
Claims (1)
1. A multistage recovery method of available oil in kitchen waste is based on a multistage recovery system of available oil in kitchen waste, and is characterized by comprising a storage tank (1), a crushing and sorting device (2), a first-stage hydrothermal reactor (4), a second-stage hydrothermal reactor (7), a third-stage hydrothermal reactor (10) and a tail water treatment device (13), wherein the output end of the storage tank (1) is connected with the input end of the crushing and sorting device (2), the output end of the crushing and sorting device (2) is connected with the input end of the first-stage hydrothermal reactor (4), the output end of the first-stage hydrothermal reactor (4) is connected with the input end of the second-stage hydrothermal reactor (7), the output end of the second-stage hydrothermal reactor (7) is connected with the input end of the third-stage hydrothermal reactor (10), a first conveying pump (3) is arranged between the output end of the crushing and the input end of the first-stage hydrothermal reactor (2) and the input end of the second-stage hydrothermal reactor (4), an oil isolation device (5) is arranged between the output end of the first-stage hydrothermal reactor (4) and the second-stage hydrothermal reactor (7) and the third-stage hydrothermal reactor (7) and a third-stage hydrothermal pump (9) is arranged in sequence, a separation device (11) and a fourth delivery pump (12) are sequentially arranged between the three-stage hydrothermal reactor (10) and the tail water treatment device (13);
The method comprises the following steps:
Step 1, kitchen waste enters a storage tank (1) from an inlet of the storage tank (1), enters a crushing and sorting device (2) through the storage tank (1), and breaks and separates solid-phase products insoluble in water in the kitchen waste;
Step 2, the crushed and sorted kitchen waste enters a first-stage hydrothermal reactor (4) and is static, floatable oil is separated out for recycling, and the kitchen waste is discharged by an oil collecting pipe through an oil separating device (5) after being static below 80 ℃ in the first-stage hydrothermal reactor (4) and skimmed out by a skimming machine or manually skimmed out, so that floatable oil is separated out for recycling;
Step 3, hydrolyzing kitchen waste in a secondary hydrothermal reactor (7) at low temperature for 30-60 minutes at 80-200 ℃ under 0.5-2MPa, introducing the kitchen waste into a gas dissolving device (8), adding air, pressurizing, installing a direct current electrode for electrolysis or adopting impeller air floatation and jet air floatation to generate bubbles to adhere oil with the density similar to that of the bubbles, and gradually moving upwards to finally separate out the grease for recycling;
And 4, separating out the biological oil from the kitchen waste after the three-stage hydrothermal reactor (10) is subjected to high-temperature thermal hydrolysis for recycling, and after the kitchen waste is subjected to high-temperature thermal hydrolysis for 30-80 minutes at 260-320 ℃ and 7-20MPa in the three-stage hydrothermal reactor (10), adding a strong polar solvent for extraction after filtering in a separating device, wherein the strong polar solvent adopts toluene or diethyl ether for recycling.
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| CN103480632A (en) * | 2013-09-24 | 2014-01-01 | 华南农业大学 | Kitchen waste hydrothermal three-phase separation system |
| CN105414158A (en) * | 2016-01-27 | 2016-03-23 | 中国农业大学 | Anaerobic fermentation coupling and hydrothermal liquidation treatment method for kitchen waste |
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| JP2002018393A (en) * | 2000-07-04 | 2002-01-22 | Kimura Chem Plants Co Ltd | Fish scrap treating equipment and fish scrap treating method |
| JP4089914B2 (en) * | 2005-05-26 | 2008-05-28 | 近畿環境興産株式会社 | Hydrothermal reactor for workpieces |
| CN108773992B (en) * | 2018-04-02 | 2024-08-20 | 苏伊士环境科技(北京)有限公司 | Sludge treatment system and method for treating sludge by using same |
| CN111410394B (en) * | 2020-04-02 | 2024-11-15 | 天津裕川锦鸿环保科技有限公司 | Sludge multi-stage thermal hydrolysis treatment device, treatment method and full resource utilization method |
| CN216880983U (en) * | 2021-09-27 | 2022-07-05 | 北京国能中电节能环保技术股份有限公司 | Distributed kitchen waste treatment system |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103480632A (en) * | 2013-09-24 | 2014-01-01 | 华南农业大学 | Kitchen waste hydrothermal three-phase separation system |
| CN105414158A (en) * | 2016-01-27 | 2016-03-23 | 中国农业大学 | Anaerobic fermentation coupling and hydrothermal liquidation treatment method for kitchen waste |
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