A comprehensive treatment system for restaurant kitchen waste and kitchen waste, a comprehensive treatment method for restaurant kitchen waste and kitchen waste, and applications thereof

Abstract

The present application provides a system for the comprehensive treatment of restaurant kitchen waste and kitchen waste, a method for the comprehensive treatment of restaurant kitchen waste and kitchen waste, and applications; the system and method can not only reduce or even eliminate the use of external carbon sources, efficiently utilize organic matter in biogas residues, increase the degradation rate of cellulose and hemicellulose in kitchen waste, increase the system's methane and hydrogen production, achieve self-balance of system heat, but also adjust the carbon-nitrogen ratio of the collaborative anaerobic digestion system, making the entire system more stable and efficient.

Description

Technical Field

[0001] The present application relates to the technical field of garbage disposal, and in particular to a comprehensive disposal system for restaurant kitchen waste and kitchen waste, a comprehensive disposal method for restaurant kitchen waste and kitchen waste, and applications thereof. Background Art

[0002] Restaurant waste and kitchen waste have both harmful and resource-based characteristics. On the one hand, restaurant waste and kitchen waste are easy to spoil, emit odor, spread bacteria and viruses, and pollute the environment; on the other hand, restaurant waste and kitchen waste contain a large amount of organic matter and are easily biodegradable. They are a very valuable renewable resource. Through anaerobic fermentation technology, clean energy biogas can be produced. Wet anaerobic and dry anaerobic digestion technologies have their own advantages in treating restaurant waste and kitchen waste.

[0003] However, the large amount of biogas slurry and biogas residue produced after anaerobic digestion of food waste and kitchen waste requires further disposal. At present, biogas slurry is mainly treated by biochemical means to further remove COD and total nitrogen. The common processes are AO and two-stage AO processes. However, due to the high total nitrogen content and imbalance of carbon-nitrogen ratio in biogas slurry, a large amount of additional carbon source is required, which greatly increases the cost of water treatment. Biogas residue is mainly transported for incineration through dehydration and drying, and the organic matter in it is not fully utilized. In addition, kitchen waste contains a large amount of leftovers, vegetable leaves, fruit peels and other materials containing a large amount of cellulose and hemicellulose, which cannot be quickly and effectively degraded in dry anaerobic reactors. Summary of the invention

[0004] In order to solve the problems of high carbon source required for biogas slurry treatment after anaerobic digestion of existing restaurant kitchen waste and kitchen waste, incomplete utilization of organic matter in anaerobic biogas residue, and difficulty in degradation of cellulose and hemicellulose in kitchen waste, and to improve the energy yield of the entire system, the present application proposes a comprehensive treatment system for restaurant kitchen waste and kitchen waste, a comprehensive treatment method for restaurant kitchen waste and kitchen waste and its application; the system and method can not only reduce or even eliminate the use of external carbon sources, efficiently utilize organic matter in biogas residue, increase the degradation rate of cellulose and hemicellulose in kitchen waste, increase the methane and hydrogen production of the system, and achieve self-balance of system heat, but also adjust the carbon-nitrogen ratio of the coordinated anaerobic digestion system to make the entire system operate more stably and efficiently.

[0005] To achieve the above objectives, this application adopts the following technical solutions:

[0006] The invention of the present application is to provide a comprehensive treatment system for restaurant kitchen waste and kitchen waste, including a restaurant kitchen waste treatment system, a kitchen waste treatment system and a post-treatment system; the restaurant kitchen waste treatment system includes a restaurant kitchen waste sorting device, an oil-water separation device, a hydrolysis acidification hydrogen production reactor and a dehydration device I connected in sequence; the kitchen waste treatment system includes a kitchen waste sorting device, a kitchen waste extrusion device, a wet anaerobic reactor, a dehydration device II, a hydrothermal reactor, a coordinated dry anaerobic reactor and a solid-liquid separation device; the kitchen waste sorting device and the kitchen waste extrusion device are connected in sequence. The kitchen waste squeezing device is connected with the wet anaerobic reactor and the hydrothermal reactor respectively; the wet anaerobic reactor is connected with the dehydration device II; the hydrothermal reactor is connected with the coordinated dry anaerobic reactor and the solid-liquid separation device in sequence; wherein, the outlet of the oil-water separation device is connected with the inlet of the wet anaerobic reactor; the dehydration device I and the dehydration device II are respectively connected with the hydrothermal reactor; the post-treatment system includes two-stage AO water treatment equipment; the two-stage AO water treatment equipment is respectively connected with the dehydration device I, the dehydration device II and the solid-liquid separation equipment.

[0007] The kitchen waste sorting equipment is used to sort out the solid refractory substances in the kitchen waste and obtain kitchen waste slurry. The oil-water separation equipment is connected to the kitchen waste sorting equipment and is used to separate the kitchen waste slurry into grease and organic matter. The hydrolysis-acidification hydrogen production reactor is connected to the oil-water separation equipment and is used to carry out hydrogen production reaction on part of the organic matter to obtain hydrogen and hydrolysis-acidified biogas slurry; the dehydration equipment I is used to dehydrate the hydrolysis-acidified biogas slurry to obtain hydrolysis-acidified filtrate and hydrolysis-acidified sludge.

[0008] The kitchen waste sorting equipment is used to sort out the solid non-degradable substances and kitchen waste slurry in the kitchen waste. The kitchen waste squeezing equipment is connected to the kitchen waste sorting equipment and is used to squeeze the filtrate in the kitchen waste slurry to obtain the kitchen waste filtrate and the kitchen waste dry matrix. The wet anaerobic reactor is connected to the oil-water separation equipment and is used to carry out wet anaerobic reaction on part of the organic matter and the kitchen waste filtrate to obtain biogas and wet anaerobic biogas slurry. The dehydration equipment II dehydrates the wet anaerobic biogas slurry to obtain wet anaerobic filtrate and wet anaerobic sludge. The hydrothermal reactor is connected to the kitchen waste squeezing equipment and the dehydration equipment II, and is used for thermal hydrolysis of the kitchen waste dry matrix, the hydrolysis acidified sludge and the wet anaerobic sludge to obtain the hydrolyzed mixture. The coordinated dry anaerobic reactor is connected to the hydrothermal reactor and is used to carry out dry anaerobic reaction on the hydrolyzed mixture to obtain biogas and dry anaerobic products. The solid-liquid separation equipment is connected to the coordinated dry anaerobic reactor and is used for solid-liquid separation of dry anaerobic products to obtain dry anaerobic filtrate and dry anaerobic sludge.

[0009] The two-stage AO water treatment equipment is connected to the dehydration equipment I, the dehydration equipment II and the solid-liquid separation equipment, and is used to treat the hydrolysis acidification filtrate, the wet anaerobic filtrate and the dry anaerobic filtrate so that they meet the discharge standards.

[0010] The amount of organic matter treated for hydrolysis and acidification to produce hydrogen is controlled by the water inlet of the two-stage AO water treatment equipment.

[0011] By adopting the above system, restaurant kitchen waste and kitchen waste can be subjected to anaerobic digestion treatment in various ways according to their characteristics, thereby obtaining environmentally friendly dried sludge and clean energy such as hydrogen and biogas. The wastewater generated by anaerobic digestion can be treated by water treatment equipment and meet discharge standards.

[0012] Optionally, the kitchen waste treatment system further comprises a crude oil purification device and / or a hydrogen purification device. The crude oil purification device is connected to the oil-water separation device, and is used to purify grease into crude oil. The hydrogen purification device is connected to the hydrolysis acidification hydrogen production reactor for hydrogen purification.

[0013] Optionally, the kitchen waste treatment system further includes a biogas purification device; the biogas purification device is respectively connected to the wet anaerobic reactor and the coordinated dry anaerobic reactor to purify the biogas to obtain purified biogas.

[0014] Optionally, the post-treatment system further includes a drying device; the drying device is connected to the solid-liquid separation device, and is used to dry the dry anaerobic sludge into dried sludge.

[0015] Optionally, the biogas purification equipment and the hydrogen purification equipment are also connected to at least one of a generator set, a steam boiler and a hot water boiler respectively.

[0016] The generator set is connected to the biogas purification equipment or the hydrogen purification equipment to generate electricity by using the purified biogas or hydrogen; the hot water boiler is connected to the biogas purification equipment or the hydrogen purification equipment to burn the purified biogas or hydrogen to generate heat and obtain hot water; the steam boiler is connected to the biogas purification equipment or the hydrogen purification equipment to burn the purified biogas or hydrogen to generate heat and obtain steam.

[0017] Optionally, the steam boiler is also connected to the hydrothermal reactor to generate superheated steam by heat exchanging the purified biogas with desalted water, and the generated superheated steam is used to heat the hydrothermal reactor.

[0018] Optionally, the hot water boiler is also connected to the oil-water separation device to generate heat exchange hot water by heat exchange between the purified biogas and desalted water, and the generated heat exchange hot water is used to heat the oil-water separation device.

[0019] After desulfurization and purification, the biogas and hydrogen obtained by this system can be supplied to the hot water boiler, the steam boiler, and the generator set. The generated electricity can offset part of the electricity required for the operation of the system. This system does not require an external heat source, and realizes self-circulation of energy within the system, greatly improving energy utilization.

[0020] Another inventive point of the present application is to provide a comprehensive treatment method for restaurant kitchen waste and kitchen waste, the method comprising: (1) sorting: sorting the restaurant kitchen waste to obtain plastic debris I and restaurant kitchen slurry; sorting the kitchen waste to obtain plastic debris II and kitchen waste slurry; (2) separation and extrusion: separating oil and water from the restaurant kitchen slurry to obtain oil and organic matter; extruding the kitchen waste slurry to obtain kitchen waste filtrate and kitchen waste dry matrix; (3) hydrolysis, acidification and degassing. water: hydrolyze and acidify the 15-25% organic matter obtained after the separation of the food waste slurry in step (2) to obtain hydrogen and hydrolyzed acidified biogas slurry; dehydrate the hydrolyzed acidified biogas slurry to obtain hydrolyzed acidified filtrate and hydrolyzed acidified sludge; (4) wet anaerobic reaction and dehydration: wet anaerobic reaction is performed on the kitchen waste filtrate obtained after the kitchen waste slurry is squeezed in step (2) and the 75-85% organic matter obtained after the separation of the food waste slurry to obtain biogas and wet anaerobic biogas slurry; then the wet anaerobic reaction is performed on the kitchen waste filtrate obtained after the kitchen waste slurry is squeezed ... The anaerobic biogas slurry is dehydrated to obtain wet anaerobic filtrate and wet anaerobic sludge; (5) hydrothermal reaction and coordinated dry anaerobic reaction: the kitchen waste dry matrix obtained after the kitchen waste slurry is squeezed in step (2), the hydrolyzed acidified sludge obtained in step (3) and the wet anaerobic sludge obtained in step (4) are mixed and firstly subjected to hydrothermal reaction to obtain a hydrolyzed mixture; wherein the mixing ratio of the kitchen waste dry matrix, the hydrolyzed acidified sludge and the wet anaerobic sludge is (2-5):1:(2 ~5); then the hydrolysis mixture is subjected to a coordinated dry anaerobic reaction to obtain biogas and dry anaerobic products; then the dry anaerobic products are subjected to solid-liquid separation to obtain dry anaerobic filtrate and dry anaerobic sludge; (6) water treatment: the hydrolysis acidification filtrate obtained in step (3), the wet anaerobic filtrate obtained in step (4) and the dry anaerobic filtrate in step (5) are mixed to obtain a mixed filtrate; then two-stage AO water treatment is performed to meet the discharge standard and the filtrate can be discharged.

[0021] Kitchen waste mainly refers to food processing and edible residues generated by restaurants, canteens, schools and other catering industries. Its composition is complex, mainly oil, water, vegetables, rice, fish, meat, bones, paper towels, plastics, waste tableware, etc. Kitchen waste mainly refers to leftovers, leftover rice, vegetable leaves, fruit peels, eggshells, tea residues, bones in family life and discarded vegetable leaves in the vegetable market.

[0022] The present application treats restaurant kitchen waste and kitchen waste differently through the physical and biochemical properties of different components in the restaurant kitchen waste and kitchen waste, and cooperates with each other, ultimately recovering and producing more valuable substances, and greatly reducing the discharged waste, thereby reducing the impact of subsequent waste on the environment; and during the treatment process, the energy and materials generated by itself can meet the application of its own treatment process, realizing a self-sufficient self-circulation mode, avoiding the waste of external energy and the further increase of subsequent waste.

[0023] Optionally, in step (2), the temperature for oil-water separation is 60-90° C. and the time is 20-40 minutes.

[0024] Optionally, in step (3), the conditions for hydrolysis and acidification are: pH 5.0-5.5; temperature 35-37° C.; and hydraulic retention time 2-4 days.

[0025] Optionally, in step (4), the conditions for the wet anaerobic reaction are: pH 7.0-8.0; temperature 35-37°C; hydraulic retention time not less than 25-35 days; solid content 2%-4%.

[0026] Optionally, in step (5), the temperature of the hydrothermal reaction is 160-170°C, the pressure is 0.6-0.7 MPa, and the time is 0.5-1 h; the conditions for the coordinated dry anaerobic reaction are: pH 7.0-8.0; temperature 35-37°C; hydraulic retention time not less than 25-35 days; and solid content 10%-20%.

[0027] Optionally, the dry anaerobic sludge obtained in step (5) is further dried to obtain dried sludge; the solid content of the dried sludge is not less than 40%.

[0028] Optionally, in step (6), the carbon-nitrogen ratio in the mixed filtrate is (5-6):1.

[0029] Optionally, the hydrogen obtained in step (3), the biogas obtained in step (4) and the biogas obtained in step (5) are purified to obtain purified hydrogen and biogas, respectively.

[0030] Optionally, the purified hydrogen and biogas are used to generate electricity and / or heat.

[0031] Optionally, the heat generated is used for oil-water separation in step (2) or hydrothermal reaction in step (5). The generated electrical energy can be used in any step of the method that requires the use of electricity.

[0032] Optionally, the heat generated is used for oil-water separation in step (2), including: exchanging heat between the purified hydrogen or biogas and desalted water to generate hot water for heat exchange, and the generated hot water for heat exchange is used for oil-water separation, and the reaction is heated to meet the temperature required for oil-water separation.

[0033] Optionally, the heat generated is used for the hydrothermal reaction in step (5), including: exchanging heat between the purified hydrogen or biogas and desalted water to generate superheated steam, and using the generated superheated steam for the hydrothermal reaction to heat the reaction to meet the temperature required for the hydrothermal reaction.

[0034] Compared with the prior art, this application has the following advantages:

[0035] (1) The present application processes food waste by first sorting the food waste to remove non-organic substances such as plastics that affect subsequent reactions; then performing oil-water separation to separate oil and extract valuable substances from the waste; and then performing a hydrolysis-acidification hydrogen production reaction on the food waste filtrate obtained after the food waste treatment; the hydrolysis-acidification hydrogen production process can not only produce hydrolysis-acidified biogas slurry with a high COD concentration, providing sufficient carbon source for the subsequent two-stage AO water treatment process, but also can continuously and stably produce hydrogen, thereby improving the energy yield of the entire system;

[0036] (2) The present application makes full use of the physical and biochemical properties of food waste, kitchen waste and anaerobic sludge. The extrusion treatment of the kitchen waste slurry can effectively control the solid content of the dry matrix of the kitchen waste entering the dry anaerobic reactor, and add the easily degradable kitchen waste filtrate into the wet anaerobic reactor for reaction, thereby avoiding local acidification of the dry anaerobic reactor.

[0037] (3) Hydrothermal treatment can not only degrade most of the organic polymers in the sludge, but also decompose the cellulose and hemicellulose in the food waste dry matrix to a certain extent, which is convenient for the subsequent dry anaerobic fermentation reaction and improves the biogas yield. In addition, the solid content of the hydrolyzed acidified sludge and wet anaerobic sludge after hydrothermal treatment is also close to the optimal solid content of the dry anaerobic digestion system. Therefore, the subsequent dry anaerobic fermentation does not require dilution and repeated dehydration.

[0038] (4) The food waste dry matrix, hydrolyzed acidified sludge and wet anaerobic sludge are treated together by synergistic dry anaerobic treatment. The high ammonia nitrogen concentration in the sludge and the high carbon-nitrogen ratio of the food waste dry matrix can be used to adjust the carbon-nitrogen ratio of the entire dry anaerobic system to a certain extent. The synergistic digestion of multiple substances can improve the stability of the system and increase the biogas production of the entire system.

[0039] (5) Through the above-mentioned multi-stage anaerobic digestion treatment, the treatment efficiency of food waste and kitchen waste and the biogas production are improved. The hydrolysis and acidification hydrogen production process can not only produce hydrolysis and acidification slurry with high COD concentration, reducing the amount of carbon source added in the subsequent two-stage AO water treatment process, but also continuously and stably produce hydrogen, thereby improving the energy yield of the entire system, achieving heat self-balance in the system, and realizing the harmless and resource-based treatment of food waste and kitchen waste, with high environmental and economic benefits.

[0040] (6) The system and method can reduce or even eliminate the use of external carbon sources, efficiently utilize organic matter in biogas residue, improve the degradation rate of cellulose and hemicellulose in kitchen waste, increase the methane and hydrogen production of the system, achieve self-balance of system heat, adjust the carbon-nitrogen ratio of the synergistic anaerobic digestion system, and make the entire system more stable and efficient. The harmless and resource-based treatment of restaurant and kitchen waste is achieved, with high environmental and economic benefits, and has a very wide promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 A structural block diagram of a comprehensive treatment system for restaurant and kitchen waste provided in Example 1 of the present application;

[0042] Figure 2 A structural block diagram of a comprehensive treatment system for restaurant and kitchen waste provided in Example 2 of the present application;

[0043] Figure 3 A structural block diagram of a comprehensive treatment system for restaurant and kitchen waste provided in Example 3 of the present application;

[0044] Figure 4 This is a flow chart of the comprehensive treatment method for restaurant waste and kitchen waste provided in Example 4 of the present application.

[0045] Figure 5 This is a flow chart of the comprehensive treatment method for restaurant waste and kitchen waste provided in Example 5 of the present application. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solution and advantages of the present application more clear, the present application is further described in detail below. However, it should be understood that the description here is only used to explain the present application and is not used to limit the scope of the present application.

[0047] Unless otherwise defined, all technical terms and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present application, and the terms used herein in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application. The reagents and instruments used herein are all commercially available, and the characterization means involved can refer to the relevant descriptions in the prior art, which will not be repeated herein.

[0048] In order to further understand the present application, the present application is further described in detail below in conjunction with the best embodiment. Example 1

[0049] This embodiment provides a comprehensive treatment system for restaurant and kitchen waste, such as Figure 1As shown, it includes a restaurant kitchen waste treatment system, a kitchen waste treatment system and a post-treatment system; the restaurant kitchen waste treatment system includes a restaurant kitchen waste sorting device, an oil-water separation device, a hydrolysis acidification hydrogen production reactor and a dehydration device I connected in sequence; the kitchen waste treatment system includes a kitchen waste sorting device, a kitchen waste squeezing device, a wet anaerobic reactor, a dehydration device II, a hydrothermal reactor, a coordinated dry anaerobic reactor and a solid-liquid separation device; the kitchen waste sorting device is connected to the kitchen waste squeezing device; the kitchen waste squeezing device is respectively connected to the wet anaerobic reactor and the hydrothermal reactor; the wet anaerobic reactor is connected to the dehydration device II; the hydrothermal reactor is connected to the coordinated dry anaerobic reactor and the solid-liquid separation device in sequence; wherein, the outlet of the oil-water separation device is connected to the inlet of the wet anaerobic reactor; the dehydration device I and the dehydration device II are connected to the hydrothermal reactor; the post-treatment system includes a two-stage AO water treatment device; the two-stage AO water treatment device is respectively connected to the dehydration device I, the dehydration device II and the solid-liquid separation device.

[0050] Kitchen waste is food processing scraps and edible residues generated by restaurants, hotels, schools and other catering industries. In addition to vegetables, rice, fish, oil, it also includes solid waste such as waste tableware, plastic, paper towels, and wooden chopsticks. The kitchen waste sorting equipment has a kitchen waste inlet, a plastic debris outlet, and a kitchen slurry outlet; it can effectively separate such solid waste to obtain kitchen slurry, and the separated plastic debris is discharged.

[0051] The oil-water separation equipment has a food slurry inlet, a heat exchange hot water inlet, a grease outlet and an organic matter outlet; the food slurry inlet is connected to the food slurry outlet of the food waste sorting equipment, and the heat exchange hot water inlet is used to pass hot water to provide the heating environment required for oil-water separation, thereby improving the separation effect. The oil-water separation equipment can achieve efficient separation of grease, and the separated grease is used to refine crude oil.

[0052] The hydrolysis acidification hydrogen production reactor has an organic matter inlet, a hydrogen outlet and a hydrolysis acidification biogas outlet. The organic matter inlet is connected to the oil-water separation device for reacting part of the organic matter to produce hydrogen. The hydrolysis acidification hydrogen production reactor can also be equipped with a constant temperature water bath heating interlayer to provide a medium temperature environment.

[0053] The dehydration device 1 has a hydrolysis-acidified biogas slurry inlet, a hydrolysis-acidified filtrate outlet and a hydrolysis-acidified sludge outlet, and the hydrolysis-acidified biogas slurry inlet is connected to the hydrolysis-acidified hydrogen production reactor. The sludge solid content after dehydration is preferably in the range of 10wt% to 20wt%. The dehydration device can select devices such as filter press and centrifuge to dehydrate the hydrolysis-acidified biogas slurry to obtain hydrolysis-acidified filtrate and hydrolysis-acidified sludge.

[0054] Kitchen waste is the leftovers, leftover rice, vegetable leaves, fruit peels, egg shells, tea dregs, bones, and discarded vegetable leaves from the vegetable market, etc., which also include various solid wastes such as plastics and paper towels. The kitchen waste sorting equipment has a kitchen waste inlet, a plastic debris outlet, and a kitchen waste slurry outlet; the kitchen waste sorting equipment can effectively separate such solid waste to obtain kitchen waste slurry, and the separated plastic debris is discharged.

[0055] The kitchen waste extrusion equipment has a kitchen waste slurry inlet, a kitchen waste filtrate outlet and a kitchen waste dry matrix outlet. The kitchen waste slurry inlet is connected to the kitchen waste sorting equipment and is used to squeeze the filtrate in the kitchen waste slurry so that the solid content of the kitchen waste dry matrix meets the dry anaerobic fermentation conditions.

[0056] The wet anaerobic reactor has an organic matter inlet, a kitchen waste filtrate inlet, a biogas outlet and a wet anaerobic biogas outlet. The organic matter inlet is connected to the oil-water separation equipment, and the kitchen waste filtrate inlet is connected to the kitchen waste sorting equipment, which is used to carry out wet anaerobic reaction on part of the organic matter and the kitchen waste filtrate.

[0057] The wet anaerobic reactor can also be equipped with a constant temperature water bath heating interlayer to provide a medium temperature environment, and equipped with a stirring device, a bottom slag discharge and a top slag floating structure to ensure the normal operation of the wet anaerobic reactor.

[0058] The dewatering device II has a wet anaerobic biogas inlet, a wet anaerobic filtrate outlet and a wet anaerobic sludge outlet, and the wet anaerobic biogas inlet is connected to the wet anaerobic reactor. The solid content of the sludge after dewatering is preferably in the range of 10wt% to 20wt%. The dewatering device can be a filter press, a centrifuge or the like, which is used to dehydrate the wet anaerobic biogas to obtain wet anaerobic filtrate and wet anaerobic sludge.

[0059] The dehydration device I and the dehydration device II can be the same dehydration device, that is, the dehydration device simultaneously has a hydrolysis acidified biogas slurry inlet, a wet anaerobic biogas slurry inlet, a hydrolysis acidified filtrate outlet, a hydrolysis acidified sludge outlet, a wet anaerobic filtrate outlet and a wet anaerobic sludge outlet, the hydrolysis acidified biogas slurry inlet is connected to the hydrolysis acidified hydrogen production reactor, and the wet anaerobic biogas slurry inlet is connected to the wet anaerobic reactor, and is used to dehydrate the hydrolysis acidified biogas slurry to obtain hydrolysis acidified filtrate and hydrolysis acidified sludge, and to dehydrate the wet anaerobic biogas slurry to obtain wet anaerobic filtrate and wet anaerobic sludge; the hydrolysis acidified biogas slurry and the wet anaerobic biogas slurry can be simultaneously introduced into the dehydration device for dehydration, and the obtained filtrate and sludge are also a mixture of the two after dehydration, and the mixed dehydration does not affect the subsequent reaction.

[0060] The hydrothermal reactor has a kitchen waste dry matrix inlet, a hydrolysis acidified sludge inlet, a wet anaerobic sludge inlet, a superheated steam inlet and a hydrolyzed mixture outlet. The kitchen waste dry matrix inlet is connected to the kitchen waste dry matrix outlet of the kitchen waste extrusion device, the hydrolysis acidified sludge inlet and the wet anaerobic sludge inlet are respectively connected to the dehydration device, and the superheated steam inlet is used to pass superheated steam to heat the hydrothermal reactor. The hydrothermal reactor is used for thermal hydrolysis of kitchen waste dry matrix, hydrolysis acidified sludge and wet anaerobic sludge.

[0061] The coordinated dry anaerobic reactor is provided with a hydrothermal mixture inlet, a biogas outlet and a dry anaerobic product outlet. The hydrothermal mixture inlet is connected to the hydrothermal reactor for carrying out dry anaerobic reaction on the hydrolyzed mixture.

[0062] The synergistic dry anaerobic reactor can also be equipped with a constant temperature water bath heating interlayer to provide a medium temperature environment, and is equipped with a stirring device and a bottom slag discharge structure.

[0063] The solid-liquid separation equipment has a dry anaerobic product inlet, a dry anaerobic filtrate outlet and a dry anaerobic sludge outlet, and the dry anaerobic product inlet is connected to the coordinated dry anaerobic reactor; the solid content of the dehydrated sludge is preferably in the range of 25wt%.

[0064] The solid-liquid separation equipment may be a filter press, a centrifuge or the like, which is used for solid-liquid separation of dry anaerobic products.

[0065] The drying equipment has a dry anaerobic sludge inlet and a dried sludge outlet, wherein the dry anaerobic sludge inlet is connected to the solid-liquid separation equipment and is used to dry the dry anaerobic sludge into dried sludge. The drying equipment may be a belt drying equipment, such as a belt dryer.

[0066] The two-stage AO water treatment equipment has a hydrolysis acidified filtrate inlet, a wet anaerobic filtrate inlet, a dry anaerobic filtrate inlet and a qualified water outlet. The hydrolysis acidified filtrate inlet and the wet anaerobic filtrate inlet are connected to the dehydration equipment, and the dry anaerobic filtrate inlet is connected to the solid-liquid separation equipment. It is used to treat the hydrolysis acidified filtrate, the wet anaerobic filtrate and the dry anaerobic filtrate so that they can be discharged up to the standards.

[0067] Example 2

[0068] This embodiment provides a comprehensive treatment system for restaurant and kitchen waste, such as Figure 2As shown, it includes a restaurant kitchen waste treatment system, a kitchen waste treatment system and a post-treatment system; the restaurant kitchen waste treatment system includes a restaurant kitchen waste sorting equipment, an oil-water separation equipment, a hydrolysis acidification hydrogen production reactor and a dehydration equipment connected in sequence; the kitchen waste treatment system includes a kitchen waste sorting equipment, a kitchen waste extrusion equipment, a wet anaerobic reactor, a dehydration equipment, a hydrothermal reactor, a coordinated dry anaerobic reactor and a solid-liquid separation equipment; the kitchen waste sorting equipment is connected to the kitchen waste extrusion equipment; the kitchen waste extrusion equipment is respectively connected to the wet anaerobic reactor and the hydrothermal reactor; the wet anaerobic reactor is connected to the dehydration equipment; the hydrothermal reactor is connected to the coordinated dry anaerobic reactor and the solid-liquid separation equipment in sequence; wherein, the outlet of the oil-water separation equipment is connected to the inlet of the wet anaerobic reactor; the dehydration equipment is connected to the hydrothermal reactor; the post-treatment system includes a two-stage AO water treatment equipment; the two-stage AO water treatment equipment is respectively connected to the dehydration equipment and the solid-liquid separation equipment.

[0069] Among them, the food waste first enters the food waste sorting equipment to obtain plastic debris and food waste slurry. The separated plastic debris can be discharged, and the remaining food waste slurry enters the oil-water separation equipment for oil-water separation to obtain oil and organic matter. The oil can be used for further purification, and the organic matter is divided into two parts for separate treatment.

[0070] The kitchen waste enters the kitchen waste sorting equipment to obtain plastic debris and kitchen waste slurry. The separated plastic debris can be discharged, and the remaining kitchen waste slurry enters the kitchen waste extrusion equipment, so that the solids in the kitchen waste slurry are compressed to discharge more water, thereby obtaining kitchen waste filtrate and kitchen waste dry matrix. Through multiple extrusions, the water content of the kitchen waste dry matrix can be further reduced to 75-80%, that is, the solid content of the kitchen waste dry matrix is ​​20%~25%, which meets the conditions of dry anaerobic fermentation.

[0071] Oil and water are separated to obtain oil and organic matter. The oil can be used for further purification, and the organic matter is divided into two parts for separate treatment.

[0072] A portion of the organic matter (15-25%) enters the hydrolysis-acidification hydrogen production reactor for hydrolysis-acidification to obtain hydrogen and the remaining hydrolysis-acidified biogas slurry. The obtained hydrogen can be used for a variety of purposes after purification, such as being applied to generators to convert into electrical energy or being burned to generate heat for heating. The remaining hydrolysis-acidified biogas slurry enters the dehydration equipment for separation of solids and liquids to obtain hydrolysis-acidified filtrate and hydrolysis-acidified sludge, and the solid content of the hydrolysis-acidified sludge is between 10wt% and 20wt%. The hydrolysis-acidified filtrate enters the two-stage AO water treatment equipment for treatment to obtain a discharge liquid that meets the standards, which can then be discharged.

[0073] The other part of organic matter (75%~85%), together with the kitchen waste filtrate after squeezing the kitchen waste, enters the wet anaerobic reactor for wet anaerobic reaction to produce biogas. The application of biogas is the same as hydrogen. It can be used for various purposes after purification, such as being used in generators to convert into electrical energy or being burned to generate heat for heating.

[0074] After the wet anaerobic reaction, wet anaerobic biogas slurry remains; the wet anaerobic biogas slurry is then sent to a dehydration device for dehydration to obtain wet anaerobic filtrate and wet anaerobic sludge.

[0075] If the hydrolysis-acidified biogas slurry and the wet anaerobic biogas slurry enter the dehydration equipment for dehydration at the same time, the obtained filtrate and sludge are also a mixture of the two after dehydration, that is, a mixed filtrate of wet anaerobic and hydrolysis-acidification and a mixed sludge of wet anaerobic and hydrolysis-acidification.

[0076] The mixed filtrate of wet anaerobic and hydrolysis acidification, the hydrolysis acidification filtrate or the wet anaerobic filtrate is sent to the two-stage AO water treatment equipment for treatment to obtain the effluent that meets the standards, which can then be discharged.

[0077] Mixed sludge containing wet anaerobic and hydrolytic acidification, hydrolytic acidified sludge or wet anaerobic sludge and food waste dry matrix are put into the hydrothermal reactor for thermal hydrolysis. The thermal hydrolysis can not only degrade most of the organic polymers in the sludge, but also decompose the cellulose and hemicellulose in the food waste dry matrix to a certain extent. The carbon-nitrogen ratio in the subsequent dry anaerobic equipment can also be controlled by adjusting the ratio between the raw materials. Specifically, according to the initial carbon-nitrogen ratio of each material (the carbon-nitrogen ratio of food waste is generally (20-30): 1, The carbon-nitrogen ratio of sludge is generally (15-20):1). The mixing ratio of the kitchen waste dry matrix, hydrolyzed acidified sludge and wet anaerobic sludge is adjusted to (2~5):1:(2~5), so that the carbon-nitrogen ratio of the feed mixture of the dry anaerobic equipment is 20~30:1; at the same time, the thermal hydrolysis can also adjust the comprehensive solid content of the feed mixture (by adjusting the addition ratio of each material) to 10~20%, which is more in line with the subsequent dry anaerobic reaction conditions, thereby comprehensively improving the subsequent dry anaerobic reaction degree and biogas production.

[0078] The mixture coming out of the hydrothermal reactor directly enters the coordinated dry anaerobic reactor for coordinated dry anaerobic reaction, which can further degrade the organic matter in the mixture and produce biogas, and greatly reduce the generation of production waste; the generated biogas can be used for various purposes after purification, just like the previous biogas and hydrogen, for example, it can be used in generators to convert into electrical energy or be burned to generate heat energy for heating, etc.

[0079] The synergistic dry anaerobic reaction still produces certain non-gaseous products, namely dry anaerobic products. The dry anaerobic products coming out of the synergistic dry anaerobic reactor enter the solid-liquid separation equipment to separate the dry anaerobic filtrate and dry anaerobic sludge. Among them, the dry anaerobic filtrate enters the two-stage AO water treatment equipment for treatment to obtain a discharge liquid that meets the standards, which can then be discharged; the dry anaerobic sludge is dried to obtain dried sludge, which can be used for soil fertilizer, etc.

[0080] Example 3

[0081] This embodiment provides a comprehensive treatment system for restaurant and kitchen waste, which is similar to the embodiment 2, except that the improvement is made on the system of the embodiment 2. The same parts are not repeated here. The different parts are as follows: Figure 3 shown.

[0082] The oil and fat obtained from the oil-water separation equipment enters the crude oil purification equipment for further purification to obtain crude oil, which can be sold directly.

[0083] The hydrogen produced in the hydrolysis acidification hydrogen production reactor is placed in a hydrogen purification device to remove methane, carbon dioxide, hydrogen sulfide, etc. from the hydrogen so as to obtain purified hydrogen; the purified hydrogen can be converted into electrical energy or thermal energy.

[0084] The biogas obtained from the wet anaerobic reactor and the biogas obtained from the coordinated dry anaerobic reactor are also subjected to biogas purification, and are separately or connected to the same biogas purification equipment to remove hydrogen sulfide and moisture in the biogas to obtain purified biogas; the purified biogas can be converted into electrical energy or thermal energy.

[0085] The purified hydrogen or biogas can also be used to generate electricity. For example, a generator set can be connected after the hydrogen purification device and the biogas purification device, respectively, and the generator set has an inlet for purified hydrogen or biogas and an outlet for electricity output.

[0086] Specifically, according to 1m 3 The model of the generator set is selected based on the power output of biogas, which is 1.5~2.6kWh. The electricity generated by the generator set can be used for system operation, further reducing operating costs.

[0087] The oil-water separation equipment requires a certain temperature for oil-water separation. By connecting a hot water boiler, the hot water generated by the hot water boiler provides the heating environment required for oil-water separation, thereby improving the separation effect; the hot water of the hot water boiler can be obtained by burning the purified hydrogen or biogas mentioned above.

[0088] The hot water boiler has a purified biogas inlet, a cold desalted water inlet, a combustion flue gas outlet and a heat exchange hot water outlet. The cold desalted water inlet is used to pass cold desalted water, and the combustion flue gas outlet is used to discharge combustion waste gas. The purified hydrogen or biogas is burned and heat-exchanged with cold desalted water to obtain combustion flue gas and heat exchange hot water, which are supplied to the oil-water separation equipment for heating. Since the hydrogen or biogas has been purified and does not contain other harmful gases, the combustion flue gas can be discharged directly.

[0089] The hydrothermal reactor also requires a relatively high temperature for the hydrothermal reaction. By connecting a steam boiler, the steam generated by the steam boiler provides the high temperature environment required for the hydrothermal reaction, thereby improving the hydrolysis effect. The steam of the steam boiler can be obtained by burning the above-mentioned purified hydrogen or biogas.

[0090] The steam boiler has a purified biogas inlet, a desalted water inlet, a combustion flue gas outlet and a superheated steam outlet. The desalted water inlet is used to introduce cold desalted water, and the combustion flue gas outlet is used to discharge combustion waste gas. The steam boiler is used to burn the purified hydrogen or biogas and exchange heat with cold desalted water to obtain combustion flue gas and superheated steam, which are supplied to the hydrothermal reactor for water bath heating. Since the hydrogen or biogas has been purified, the combustion flue gas can be discharged directly.

[0091] Example 4

[0092] The present embodiment provides a method for comprehensive treatment of restaurant kitchen waste and kitchen waste, the method comprising: (1) sorting: sorting the restaurant kitchen waste to obtain plastic debris I and restaurant kitchen slurry; sorting the kitchen waste to obtain plastic debris II and kitchen waste slurry; (2) separation and extrusion: separating oil and water from the restaurant kitchen slurry to obtain oil and organic matter; extruding the kitchen waste slurry to obtain kitchen waste filtrate and kitchen waste dry matrix; (3) hydrolysis, acidification and dehydration: hydrolyzing the step In step (2), part of the organic matter obtained after separation of the food waste slurry is subjected to hydrolysis and acidification to obtain hydrogen and hydrolysis and acidification biogas slurry; the hydrolysis and acidification biogas slurry is dehydrated to obtain hydrolysis and acidification filtrate and hydrolysis and acidification sludge; (4) wet anaerobic reaction and dehydration: the kitchen waste filtrate obtained after squeezing the kitchen waste slurry in step (2) and another part of the organic matter obtained after separation of the food waste slurry are subjected to wet anaerobic reaction to obtain biogas and wet anaerobic biogas slurry; then the wet anaerobic biogas slurry is subjected to Dehydration to obtain wet anaerobic filtrate and wet anaerobic sludge; (5) hydrothermal reaction and coordinated dry anaerobic reaction: the kitchen waste dry matrix obtained after squeezing the kitchen waste slurry in step (2), the hydrolyzed acidified sludge obtained in step (3) and the wet anaerobic sludge obtained in step (4) are mixed and first subjected to hydrothermal reaction to obtain a hydrolyzed mixture; wherein the mixing ratio of the kitchen waste dry matrix, the hydrolyzed acidified sludge and the wet anaerobic sludge is (2-5):1:(2-5) ; then the hydrolysis mixture is subjected to a coordinated dry anaerobic reaction to obtain biogas and dry anaerobic products; then the dry anaerobic products are subjected to solid-liquid separation to obtain dry anaerobic filtrate and dry anaerobic sludge; (6) water treatment: the hydrolysis acidification filtrate obtained in step (3), the wet anaerobic filtrate obtained in step (4) and the dry anaerobic filtrate in step (5) are mixed to obtain a mixed filtrate; then two-stage AO water treatment is performed to meet the discharge standards and the mixed filtrate is discharged.

[0093] like Figure 4 As shown, the food waste is sorted to obtain food waste slurry and plastic debris. The separated plastic debris can be discharged, and the remaining food waste slurry is separated into oil and water to obtain grease and organic matter. The grease can be used for further purification, and the organic matter is divided into two parts for separate treatment.

[0094] The kitchen waste is sorted to obtain plastic debris and kitchen waste slurry. The separated plastic debris can be discharged, and the remaining kitchen waste slurry is further squeezed so that the solids in the kitchen waste slurry are compressed to discharge more water, thereby obtaining kitchen waste filtrate and kitchen waste dry matrix. The water content of the kitchen waste dry matrix can be further reduced by multiple squeezing, which meets the conditions of dry anaerobic fermentation.

[0095] A portion of the organic matter (15-25%) is hydrolyzed and acidified to obtain hydrogen and the remaining hydrolyzed and acidified biogas. The obtained hydrogen can be used for a variety of purposes after purification, such as being applied to generators to convert into electrical energy or being burned to generate heat for heating. The remaining hydrolyzed and acidified biogas is dehydrated to obtain hydrolyzed and acidified filtrate and hydrolyzed and acidified sludge, and the solid content of the hydrolyzed and acidified sludge is between 10wt% and 20wt%. The hydrolyzed and acidified filtrate is subjected to two-stage AO water treatment to obtain a discharge liquid that meets the standards, which can then be discharged.

[0096] The other part of organic matter (75-85%) undergoes wet anaerobic reaction with the kitchen waste filtrate obtained after squeezing the kitchen waste to produce biogas. The application of biogas is the same as that of hydrogen. It can be used for various purposes after purification, such as being used in generators to convert into electrical energy or being burned to generate heat for heating.

[0097] After the wet anaerobic reaction, wet anaerobic biogas slurry remains; the wet anaerobic biogas slurry is then dehydrated to obtain wet anaerobic filtrate and wet anaerobic sludge. The hydrolysis-acidified biogas slurry and the wet anaerobic biogas slurry are dehydrated at the same time, and the obtained filtrate and sludge are also a mixture of the two after dehydration, that is, a mixed filtrate of wet anaerobic and hydrolysis-acidification and a mixed sludge of wet anaerobic and hydrolysis-acidification.

[0098] The mixed filtrate of wet anaerobic and hydrolysis acidification, the hydrolysis acidification filtrate or the wet anaerobic filtrate is further treated with two-stage AO water to obtain a effluent that meets the standards and can be discharged.

[0099] Mixed sludge containing wet anaerobic and hydrolytic acidification, hydrolytic acidified sludge or wet anaerobic sludge and food waste dry matrix undergoes hydrothermal reaction together. The hydrothermal reaction can not only degrade most of the organic polymers in the sludge, but also decompose the cellulose and hemicellulose in the food waste dry matrix to a certain extent; it can also control the carbon-nitrogen ratio in the subsequent dry anaerobic equipment by adjusting the ratio between the various raw materials; at the same time, the thermal hydrolysis can also adjust the solid content of each raw material to make it more in line with the reaction conditions of the subsequent dry anaerobic reaction, thereby comprehensively improving the reaction degree and biogas production of the subsequent dry anaerobic reaction.

[0100] The mixture after the hydrothermal reaction is directly subjected to a coordinated dry anaerobic reaction, which can further degrade the organic matter in the mixture and produce biogas, and greatly reduce the generation of production waste; the generated biogas can be used for a variety of purposes after purification, just like the previous biogas and hydrogen, for example, it can be used in generators to convert into electrical energy or burned to generate heat energy for heating, etc.

[0101] The coordinated dry anaerobic reaction still produces certain non-gaseous products, namely dry anaerobic products, which are subjected to solid-liquid separation to obtain dry anaerobic filtrate and dry anaerobic sludge. The dry anaerobic filtrate is subjected to two-stage AO water treatment to obtain a discharge liquid that meets the standards, which can then be discharged; the dry anaerobic sludge is dried to obtain dried sludge, which can be used for soil fertilizer, etc.

[0102] Example 5

[0103] This embodiment provides a comprehensive treatment method for restaurant kitchen waste and kitchen waste, which is similar to the embodiment 4, except that the improvement is made on the system of the embodiment 4. The same parts are not repeated here. The different parts are as follows: Figure 5 shown.

[0104] The oil obtained from the oil-water separation equipment is further purified to obtain crude oil, which can be processed into biodiesel or sold directly.

[0105] The hydrogen produced by hydrolysis and acidification is purified to remove methane, carbon dioxide, hydrogen sulfide, etc. from the hydrogen to obtain purified hydrogen; the purified hydrogen can be converted into electrical energy or thermal energy.

[0106] The biogas obtained from the wet anaerobic reaction and the biogas obtained from the coordinated dry anaerobic reaction are also subjected to biogas purification to remove hydrogen sulfide and water in the biogas to obtain purified biogas; the purified biogas can be converted into electrical energy or thermal energy.

[0107] The purified hydrogen or biogas can also be used to generate electricity, for example, they can be connected to a generator set respectively, which can convert the purified hydrogen or biogas into electricity.

[0108] Specifically, according to 1m 3 The model of the generator set is selected based on the power output of biogas, which is 1.5~2.6kWh. The electricity generated by the generator set can be used for system operation, further reducing operating costs.

[0109] Oil-water separation requires a certain temperature. The hot water obtained by burning the purified hydrogen or biogas provides the heating environment required for oil-water separation, thereby improving the separation effect. Specifically, the purified hydrogen or biogas is burned and heat-exchanged with cold desalted water to obtain combustion flue gas and heat-exchange hot water, which are supplied to the oil-water separation for heating. The temperature of the heat-exchange hot water is controlled at 60-90 degrees Celsius. Since the hydrogen or biogas has been purified and there are no other harmful gases, the combustion flue gas can be discharged directly.

[0110] The hydrothermal reaction also requires a relatively high temperature. The steam obtained by burning the purified hydrogen or biogas provides the high temperature environment required for the hydrothermal reaction, thereby improving the hydrolysis effect. Specifically, the purified hydrogen or biogas is burned and heat-exchanged with cold desalted water to obtain combustion flue gas and superheated steam, which are supplied to the hydrothermal reaction for water bath heating. The temperature of the superheated steam is controlled at 160-170 degrees Celsius. Since the hydrogen or biogas has been purified, the combustion flue gas can be discharged directly.

[0111] Example 6

[0112] This embodiment provides a method for comprehensive treatment of restaurant waste and kitchen waste, which is processed by using any one of the equipment in Embodiment 1, Embodiment 2 or Embodiment 3.

[0113] The treatment method includes:

[0114] Kitchen waste sorting: Use kitchen waste sorting equipment to sort kitchen waste in order to obtain kitchen slurry and plastic debris. Kitchen waste is food processing scraps and edible residues generated by catering industries such as restaurants, hotels and schools. In addition to vegetables, rice, fish, and grease, it also includes solid waste such as waste tableware, plastic, paper towels, and wooden chopsticks. Kitchen waste sorting can effectively separate such solid waste.

[0115] Oil-water separation: Use oil-water separation equipment to separate oil and water from the kitchen slurry to obtain grease and organic matter. The oil-water separation process mainly uses the hot water obtained by heat exchange in the hot water pot to heat and stir the kitchen slurry, and separates the grease through the oil-water separation equipment. The heating and stirring temperature is 60~90℃, and the heating and stirring time is 20~40 minutes.

[0116] Kitchen waste sorting: Use kitchen waste sorting equipment to sort kitchen waste in order to obtain kitchen waste slurry and plastic debris. Kitchen waste is leftovers, leftovers, vegetable leaves, fruit peels, egg shells, tea dregs, bones, and discarded vegetable leaves from the vegetable market in family life, and also includes various solid wastes such as plastics and paper towels. Kitchen waste sorting can effectively separate such solid waste.

[0117] Kitchen waste extrusion: Use kitchen waste extrusion equipment to extrude the kitchen waste to squeeze out the filtrate in the kitchen waste slurry, so that the solid content of the kitchen waste dry matrix meets the conditions of dry anaerobic fermentation.

[0118] Hydrolysis and acidification: Use a hydrolysis and acidification hydrogen production reactor to hydrolyze and acidify part of the organic matter to obtain hydrogen and hydrolysis and acidification of biogas slurry. The temperature of the hydrolysis and acidification hydrogen production reaction process is controlled at 35~37℃, the hydraulic retention time is 2~4 days, and the pH value is stabilized at 5.0~5.5.

[0119] Wet anaerobic: Use a wet anaerobic reactor to carry out wet anaerobic reaction on part of the organic matter and the kitchen waste filtrate. In order to improve the efficiency of the methanogenic reaction, the temperature of the wet anaerobic reaction is controlled at 35-37°C, the pH is 7.0-8.0, the hydraulic retention time is not less than 25 days, preferably 25-35 days, and the solid content of the mixture of part of the organic matter and the kitchen waste filtrate is controlled at 2%-4%.

[0120] Biogas slurry dehydration: Dehydration equipment is used to dehydrate hydrolysis acidified biogas slurry and wet anaerobic biogas slurry to obtain hydrolysis acidified filtrate, hydrolysis acidified sludge, wet anaerobic filtrate and wet anaerobic sludge. The dehydration equipment can be a filter press, a centrifuge and other devices. The solid content of the dehydrated sludge is about 10wt%~20wt%.

[0121] Hydrothermal reaction: A hydrothermal reactor is used to perform a hydrothermal reaction on a mixture of kitchen waste dry matrix, hydrolyzed acidified sludge and wet anaerobic sludge to obtain a hydrothermal mixture. The working temperature of the hydrothermal reactor is 160-170°C, the pressure is 0.6-0.7MPa, and the time is 0.5-1 hour. The heat source of the hydrothermal reactor can come from the superheated steam generated by the steam boiler.

[0122] Synergistic dry anaerobic reaction: Use a synergistic dry anaerobic reactor to perform dry anaerobic reaction on the hydrothermal mixture. In order to improve the efficiency of the methanogenic reaction, the temperature of the synergistic dry anaerobic reaction is controlled at 35-37°C, the pH is 7.0-8.0, the hydraulic retention time is not less than 25 days, preferably 25-35 days, and the solid content of the hydrothermal mixture entering the synergistic dry anaerobic reactor is controlled at 10%-20%.

[0123] Solid-liquid separation: Use solid-liquid separation equipment to dehydrate the dry anaerobic product to reduce the water content of the dry anaerobic sludge. The solid-liquid separation equipment can be a filter press, centrifuge and other devices. The solid content of the dehydrated sludge is about 25wt%.

[0124] Sludge drying: Dry anaerobic sludge is dried using drying equipment. The solid content of the dried sludge is not less than 40%, and it can be incinerated, carbonized or made into bricks.

[0125] Water treatment: Use two-stage AO water treatment equipment to purify the hydrolysis acidification filtrate, wet anaerobic filtrate and dry anaerobic filtrate to meet the discharge standards.

[0126] Test Example 1

[0127] The restaurant kitchen waste comes from a certain industrial park in Nanjing and surrounding restaurants, 5 tons / day; the kitchen waste comes from the vegetable markets around a certain industrial park in Nanjing and the residents’ classified wet waste, 0.8 tons / day.

[0128] Food waste sorting: Use food waste sorting equipment to sort the daily food waste to obtain food slurry and plastic debris; the mass of food slurry is 4.5 tons / day.

[0129] Oil-water separation: Use oil-water separation equipment to separate oil and water from the kitchen slurry. The temperature of oil-water separation is 60~65℃, and the heating and stirring time is 30 minutes to obtain oil and organic matter. The masses of oil and organic matter are 0.14 tons / day and 4.36 tons / day respectively.

[0130] Kitchen waste sorting: Use kitchen waste sorting equipment to sort the daily kitchen waste to obtain kitchen waste slurry and plastic debris; the mass of kitchen waste slurry is 0.72 tons / day.

[0131] Kitchen waste extrusion: Use kitchen waste extrusion equipment to extrude the kitchen waste, squeeze out the filtrate in the kitchen waste slurry, and obtain 0.27 tons of filtrate / day, 0.45 tons of kitchen waste dry matrix / day, and a solid content of 20~21%.

[0132] Hydrolysis and acidification: A hydrolysis and acidification hydrogen production reactor is used to hydrolyze and acidify part of the organic matter (0.86 tons / day, 19.7%) to obtain hydrogen and hydrolysis and acidification slurry. The temperature of the hydrolysis and acidification hydrogen production reaction process is controlled at 35~37℃, the hydraulic retention time is 3 days, and the pH value is stable at 5.0~5.5.

[0133] Wet anaerobic: A wet anaerobic reactor is used to carry out wet anaerobic reaction on part of the organic matter (3.5 tons / day, 80.3%) and kitchen waste filtrate (0.27 tons / day). In order to improve the efficiency of the methanogenic reaction, the temperature of the wet anaerobic reaction is controlled at 35~37℃, the pH is 7.0~8.0, the hydraulic retention time is 28 days, and the solid content is about 2~3%.

[0134] Biogas slurry dehydration: Use dehydration equipment (centrifugal dehydrator) to dehydrate the hydrolysis acidified biogas slurry and wet anaerobic biogas slurry respectively to obtain hydrolysis acidified filtrate (0.71 tons / day), hydrolysis acidified sludge (0.15 tons / day), wet anaerobic filtrate (3.15 tons / day) and wet anaerobic sludge (0.62 tons / day); the solid content of the dehydrated sludge is 18~20wt%.

[0135] Hydrothermal reaction: A hydrothermal reactor is used to hydrothermally react a mixture (carbon-nitrogen ratio of 20-24:1) of kitchen waste dry matrix (0.45 tons / day, carbon-nitrogen ratio of 28-30:1), hydrolyzed acidified sludge (0.15 tons / day, carbon-nitrogen ratio of 18-20:1) and wet anaerobic sludge (0.62 tons / day, carbon-nitrogen ratio of 18-20:1) to obtain a hydrothermal mixture with a solid content controlled at 17-18%. The working temperature of the hydrothermal reactor is 160-170°C, the pressure is 0.6-0.7MPa, and the time is 1 hour.

[0136] Synergistic dry anaerobic reaction: Use a synergistic dry anaerobic reactor to carry out dry anaerobic reaction on the hydrothermal mixture. The temperature of the synergistic dry anaerobic reaction is controlled at 35-37°C, the pH is 7.0-8.0, and the hydraulic retention time is 30 days.

[0137] Solid-liquid separation: Use solid-liquid separation equipment (plate and frame filter press) to dehydrate the dry anaerobic product. The solid content of the dehydrated sludge is about 25wt%, and 0.342 tons / day of dry anaerobic filtrate is obtained.

[0138] Sludge drying: Dry anaerobic sludge is dried using drying equipment. The solid content of the dried sludge is about 40%, and the mass is about 0.549 tons / day. It can then be incinerated, carbonized or made into bricks, etc.

[0139] Water treatment: Two-stage AO water treatment equipment is used to purify the hydrolysis acidification filtrate (0.71 tons / day), wet anaerobic filtrate (3.15 tons / day) and dry anaerobic filtrate (0.4 tons / day) to meet the discharge standards.

[0140] Test Example 2

[0141] The restaurant kitchen waste comes from a university cafeteria in Nanjing, 500kg / day; the kitchen waste comes from the back kitchen of a university cafeteria in Nanjing, 80kg / day.

[0142] Kitchen waste sorting: Use kitchen waste sorting equipment to sort the daily kitchen waste to obtain kitchen slurry and plastic debris; the mass of the kitchen slurry is 450kg / day.

[0143] Oil-water separation: Use oil-water separation equipment to separate oil and water from the kitchen slurry. The temperature of oil-water separation is 65~70℃, and the heating and stirring time is 40 minutes to obtain oil and organic matter. The masses of oil and organic matter are 14kg / day and 436kg / day respectively.

[0144] Kitchen waste sorting: Use kitchen waste sorting equipment to sort the daily kitchen waste to obtain kitchen waste slurry and plastic debris; the mass of kitchen waste slurry is 75kg / day.

[0145] Kitchen waste extrusion: Use kitchen waste extrusion equipment to extrude the kitchen waste, squeeze out the filtrate in the kitchen waste slurry, and obtain 25kg / day of filtrate and 50kg / day of kitchen waste dry matrix, with a solid content of about 20~22%.

[0146] Hydrolysis and acidification: A hydrolysis and acidification hydrogen production reactor is used to hydrolyze and acidify part of the organic matter (85kg / day, 19.5%) to obtain hydrogen and hydrolysis and acidification slurry. The temperature of the hydrolysis and acidification hydrogen production reaction process is controlled at 35~37℃, the hydraulic retention time is 3 days, and the pH value is stable at 5.0~5.5.

[0147] Wet anaerobic: A wet anaerobic reactor is used to carry out wet anaerobic reaction on part of the organic matter (351kg / day, 80.5%) and kitchen waste filtrate (25kg / day). In order to improve the efficiency of the methanogenic reaction, the temperature of the wet anaerobic reaction is controlled at 35~37℃, the pH is 7.0~8.0, the hydraulic retention time is 30 days, and the solid content is about 3%.

[0148] Biogas slurry dehydration: Use dehydration equipment (centrifugal dehydrator) to dehydrate the hydrolyzed acidified biogas slurry and wet anaerobic biogas slurry respectively to obtain hydrolyzed acidified filtrate (70kg / day), hydrolyzed acidified sludge (15kg / day), wet anaerobic filtrate (316kg / day) and wet anaerobic sludge (60kg / day); the solid content of the dehydrated sludge is 18~20 wt%.

[0149] Hydrothermal reaction: A hydrothermal reactor is used to hydrothermally react a mixture of kitchen waste dry matrix (50kg / day, carbon-nitrogen ratio 28-30:1), hydrolyzed acidified sludge (15kg / day, carbon-nitrogen ratio 18-20:1) and wet anaerobic sludge (60kg / day, carbon-nitrogen ratio 18-20:1) (carbon-nitrogen ratio 22-24:1) to obtain a hydrothermal mixture with a solid content of about 18%. The working temperature of the hydrothermal reactor is 160-170°C, the pressure is 0.6-0.7MPa, and the time is 1 hour.

[0150] Synergistic dry anaerobic reaction: Use a synergistic dry anaerobic reactor to carry out dry anaerobic reaction on the hydrothermal mixture. The temperature of the wet anaerobic reaction is controlled at 35-37°C, the pH is 7.0-8.0, and the hydraulic retention time is 35 days.

[0151] Solid-liquid separation: Use solid-liquid separation equipment (plate and frame filter press) to dehydrate the dry anaerobic product. The solid content of the dehydrated sludge is about 25wt%, and 35kg / day of dry anaerobic filtrate is obtained.

[0152] Sludge drying: Dry anaerobic sludge is dried using drying equipment. The solid content of the dried sludge is about 40%, and the mass is 56.25kg / day. It can then be incinerated, carbonized or made into bricks.

[0153] Water treatment: Use two-stage AO water treatment equipment to purify the hydrolysis acidification filtrate (70kg / day), wet anaerobic filtrate (316kg / day) and dry anaerobic filtrate (40kg / day) to meet the discharge standards.

[0154] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions or improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A comprehensive treatment system for restaurant and kitchen waste, characterized in that: Including restaurant waste treatment system, kitchen waste treatment system and post-treatment system; The restaurant kitchen waste treatment system includes a restaurant kitchen waste sorting device, an oil-water separation device, a hydrolysis acidification hydrogen production reactor and a dehydration device I connected in sequence; The kitchen waste treatment system includes a kitchen waste sorting device, a kitchen waste squeezing device, a wet anaerobic reactor, a dehydration device II, a hydrothermal reactor, a coordinated dry anaerobic reactor and a solid-liquid separation device; the kitchen waste sorting device is connected to the kitchen waste squeezing device; the kitchen waste squeezing device is respectively connected to the wet anaerobic reactor and the hydrothermal reactor; the wet anaerobic reactor is connected to the dehydration device II; the hydrothermal reactor is connected to the coordinated dry anaerobic reactor and the solid-liquid separation device in sequence; The outlet of the oil-water separation device is connected to the inlet of the wet anaerobic reactor; the dehydration device I and the dehydration device II are respectively connected to the hydrothermal reactor, and the kitchen waste dry matrix, the hydrolysis acidified sludge and the wet anaerobic sludge are subjected to synergistic dry anaerobic treatment together, and the carbon-nitrogen ratio of the entire dry anaerobic system is adjusted by utilizing the characteristics of high ammonia nitrogen concentration in the sludge and high carbon-nitrogen ratio in the kitchen waste dry matrix; specifically, the kitchen waste dry matrix obtained by squeezing the kitchen waste slurry, the hydrolysis acidified sludge obtained by hydrolysis acidification and dehydration of the kitchen waste, and the wet anaerobic sludge obtained by dehydrating the wet anaerobic biogas slurry are mixed, and then first enter the hydrothermal reactor for hydrothermal reaction, and the mixture coming out of the hydrothermal reactor directly enters the synergistic dry anaerobic reactor for synergistic dry anaerobic reaction; wherein the mixing ratio of the kitchen waste dry matrix, the hydrolysis acidified sludge and the wet anaerobic sludge is (2-5):1:(2-5); The post-processing system includes two-stage AO water treatment equipment; the two-stage AO water treatment equipment is respectively connected to the dehydration equipment I, the dehydration equipment II and the solid-liquid separation equipment.

2. The comprehensive treatment system for restaurant and kitchen waste according to claim 1 is characterized in that: The kitchen waste treatment system further comprises a crude oil purification device and / or a hydrogen purification device; the crude oil purification device is connected to the oil-water separation device; the hydrogen purification device is connected to the hydrolysis acidification hydrogen production reactor; The kitchen waste treatment system also includes a biogas purification device; the biogas purification device is respectively connected to the wet anaerobic reactor and the coordinated dry anaerobic reactor; The post-processing system also includes a drying device; the drying device is connected to the solid-liquid separation device.

3. The comprehensive treatment system for restaurant and kitchen waste according to claim 2 is characterized in that: The biogas purification equipment and the hydrogen purification equipment are also respectively connected to at least one of a generator set, a steam boiler and a hot water boiler.

4. The comprehensive treatment system for restaurant and kitchen waste according to claim 3 is characterized in that: The steam boiler is also connected to the hydrothermal reactor; the hot water boiler is also connected to the oil-water separation equipment.

5. A method for comprehensive treatment of restaurant and kitchen waste, characterized in that: include: (1) Sorting: sorting the food waste to obtain plastic debris I and food waste slurry; sorting the kitchen waste to obtain plastic debris II and kitchen waste slurry; (2) Separation and extrusion: The kitchen waste slurry is subjected to oil-water separation to obtain oil and organic matter; the kitchen waste slurry is extruded to obtain kitchen waste filtrate and kitchen waste dry matrix; (3) hydrolysis, acidification and dehydration: hydrolyzing and acidifying the 15-25% organic matter obtained after separation of the food waste slurry in step (2) to obtain hydrogen and hydrolyzed acidified biogas slurry; Dehydrating the hydrolyzed and acidified biogas slurry to obtain hydrolyzed and acidified filtrate and hydrolyzed and acidified sludge; (4) Wet anaerobic reaction and dehydration: The kitchen waste filtrate obtained after squeezing the kitchen waste slurry in step (2) and the 75-85% organic matter obtained after separation of the kitchen waste slurry are subjected to wet anaerobic reaction to obtain biogas and wet anaerobic biogas slurry; Then, the wet anaerobic biogas slurry is dehydrated to obtain wet anaerobic filtrate and wet anaerobic sludge; (5) Hydrothermal reaction and synergistic dry anaerobic reaction: The kitchen waste dry matrix obtained by squeezing the kitchen waste slurry in step (2), the hydrolyzed acidified sludge obtained in step (3) and the wet anaerobic sludge obtained in step (4) are mixed and then subjected to a hydrothermal reaction to obtain a hydrolysis mixture; wherein the mixing ratio of the kitchen waste dry matrix, the hydrolyzed acidified sludge and the wet anaerobic sludge is (2-5):1:(2-5); the carbon-nitrogen ratio of the entire dry anaerobic system is adjusted by utilizing the characteristics that the ammonia nitrogen concentration in the sludge is relatively high and the carbon-nitrogen ratio of the kitchen waste dry matrix is ​​relatively high; Then, the hydrolysis mixture is subjected to a coordinated dry anaerobic reaction to obtain biogas and dry anaerobic products; Then the dry anaerobic product is subjected to solid-liquid separation to obtain dry anaerobic filtrate and dry anaerobic sludge; (6) Water treatment: The hydrolysis acidification filtrate obtained in step (3), the wet anaerobic filtrate obtained in step (4) and the dry anaerobic filtrate in step (5) are mixed to obtain a mixed filtrate; then a two-stage AO water treatment is performed to meet the discharge standards and the mixed filtrate is discharged.

6. The method for comprehensive treatment of restaurant and kitchen waste according to claim 5, characterized in that: In step (2), the temperature for oil-water separation is 60 to 90° C. and the time is 20 to 40 minutes; In step (3), the conditions for hydrolysis and acidification are: pH 5.0-5.5; temperature 35-37° C.; hydraulic retention time 2-4 days; In step (4), the conditions of the wet anaerobic reaction are: pH 7.0-8.0; temperature 35-37° C.; hydraulic retention time not less than 25 days; solid content 2%-4%; In step (5), the temperature of the hydrothermal reaction is 160-170° C., the pressure is 0.6-0.7 MPa, and the time is 0.5-1 h; the conditions for the coordinated dry anaerobic reaction are: pH 7.0-8.0; temperature 35-37° C.; hydraulic retention time not less than 25 days; solid content 10%-20%; In step (6), the carbon-nitrogen ratio in the mixed filtrate is (5-6):

1.

7. The comprehensive treatment method for restaurant and kitchen waste according to claim 5, characterized in that: The hydrogen obtained in step (3), the biogas obtained in step (4) and the biogas obtained in step (5) are purified to obtain respectively; The dry anaerobic sludge obtained in step (5) is further dried to obtain dried sludge; the solid content of the dried sludge is not less than 40%.

8. The method for comprehensive treatment of restaurant and kitchen waste according to claim 7, characterized in that: Use the purified hydrogen and biogas for electricity and / or heat production; The heat generated is used for oil-water separation in step (2) or the hydrothermal reaction in step (5).

9. The comprehensive treatment method for restaurant and kitchen waste according to any one of claims 5 to 8, characterized in that: The food waste and kitchen waste comprehensive treatment system according to any one of claims 1 to 4 is used for treatment.

10. Use of the system for comprehensive treatment of restaurant waste and kitchen waste according to any one of claims 1 to 4 and / or the method for comprehensive treatment of restaurant waste and kitchen waste according to any one of claims 5 to 9 in waste treatment.

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