Kitchen garbage biomass energy resource cascade recovery system and recovery method

Abstract

The invention provides a kitchen garbage biomass energy resource cascade recovery system, which comprises a pretreatment unit, a biomass energy resource cascade recovery unit, a biomass energy resource cascade recovery unit and a biomass energy resource cascade recovery unit, and is characterized in that the pretreatment unit is used for pretreating kitchen garbage and straws to obtain slurry and solids; the solid phase treatment unit comprises a biological hydrolysis device, a biological fermentation device and a biological decomposition device which are connected in sequence; the biological hydrolysis device is connected with the pretreatment unit; the product utilization unit is connected with the biological decomposition device; the liquid phase treatment unit comprises a dark fermentation hydrogen production device, a microbial electrolysis cell hydrogen production device and an anaerobic digestion methane production device which are connected in sequence; the dark fermentation hydrogen production device is connected with the pretreatment unit; and the tail water utilization unit is connected with the anaerobic digestion methane production device. The gas, the liquid and the solid generated by the recovery system are subjected to effective energy recovery and maximum resource utilization, no three wastes are generated, and the recovery system can be widely applied to the fields of agriculture, environmental protection, energy and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of perishable organic solid waste resource and energy conversion, and in particular to a kitchen waste biomass energy resource cascade recovery system and recovery method. Background Art

[0002] Kitchen waste is organic waste generated in the process of high-quality urban development. It is rich in organic matter such as carbohydrates, proteins, and fats. Kitchen waste has high water content, high organic content, rich nutrition, and is easily biodegradable. It has high value for resource utilization and energy utilization. According to statistics, the content of kitchen waste in my country accounts for 40%-60% of urban domestic waste, about 500,000 tons / day, and it is increasing year by year. The organic content in kitchen waste is as high as 90%, and the water content is as high as 85%. There are problems such as difficulty in treatment, low resource utilization rate, and improper disposal that can easily cause secondary pollution. In addition, kitchen waste contains a large amount of carbohydrates and the material source is stable, which is the best raw material for biomass energy.

[0003] Conventional methods for treating kitchen waste include anaerobic digestion, aerobic fermentation and insect transformation, among which anaerobic digestion to produce methane is the mainstream route. The biogas produced by anaerobic digestion is difficult to generate electricity and connected to the grid, the added value of the product is not high, and the cost of treating the generated biogas slurry and biogas residue is high, resulting in the main reliance of kitchen waste treatment income on government subsidies and crude oil extraction. At present, with the proposal of the dual carbon strategy, it is urgent to explore the high-value utilization technology of kitchen waste and improve the efficiency of energy conversion and resource utilization.

[0004] At present, there are several methods for high-value treatment of kitchen waste: (1) Patent CN115572741A discloses a method for cascade recovery of food waste biomass energy based on component metabolic rate. The invention first performs alkaline heat pretreatment on the food waste to promote the hydrolysis and acidification of difficult-to-degrade cellulose and oil organic matter; then dark fermentation and anaerobic fermentation processes are used to cascade recover hydrogen and methane energy, thereby improving the conversion efficiency of food waste biomass energy; however, this patent only improves the energy recovery rate, and the biogas slurry and biogas residue produced by fermentation are still difficult to treat; (2) Patent CN114378105A discloses a multi-stage treatment system and method for synergistic treatment of food waste and cellulose biomass. The invention synergistically treats food waste and cellulose biomass, and realizes efficient conversion and resource utilization of food waste through methods such as hydrothermal pretreatment and fermentation to produce hydrogen and methane. However, the dark fermentation hydrogen production efficiency of this patent is not high, and the anaerobic conversion is not complete, and the technology of culturing microalgae in the generated biogas slurry is difficult; (3) Patent CN117417968A discloses a deep disposal method and system for resource utilization of kitchen waste. The invention first anaerobically ferments kitchen waste to produce methane, and uses an isothermal pyrolysis system to enhance heat and mass transfer of the generated biogas residue. This method improves the pyrolysis efficiency, but the energy consumption is high and it is not low-carbon.

[0005] Therefore, there is an urgent need to provide a kitchen waste recycling method that is easy to process biogas slurry and biogas residue, has high efficiency in dark fermentation to produce hydrogen, has high energy resource recovery rate and is low in carbon. Summary of the invention

[0006] In view of the shortcomings of the prior art mentioned above, the object of the present invention is to provide a kitchen waste biomass energy resource cascade recovery system and recovery method, which is used to solve the problems of low energy resource recovery and utilization rate, low dark fermentation hydrogen production efficiency, and difficult treatment of biogas slurry and biogas residue in the prior art.

[0007] To achieve the above objectives and other related objectives, the present invention is achieved through the following technical solutions.

[0008] The first aspect of the present invention is to provide a kitchen waste biomass energy resource cascade recovery system, the recovery system comprising:

[0009] A pretreatment unit, used for pretreating kitchen waste and straw to obtain slurry and solid;

[0010] A solid phase treatment unit, used for treating solids, comprises a biological hydrolysis device, a biological fermentation device and a biological composting device connected in sequence; the biological hydrolysis device is connected to the pretreatment unit;

[0011] The product utilization unit is connected to the biological composting device and is used for resource processing of the composted products;

[0012] A liquid phase treatment unit, used for treating the slurry, comprises a dark fermentation hydrogen production device, a microbial electrolytic cell hydrogen production device and an anaerobic digestion methane production device connected in sequence; the dark fermentation hydrogen production device is connected to the pretreatment unit;

[0013] A tail water utilization unit, connected to the anaerobic digestion methanogen device, for resource utilization of the methanogen fermentation liquid;

[0014] A hydrogen purification unit is used to purify and store the obtained hydrogen, and is connected to the dark fermentation hydrogen production device and the microbial electrolytic cell hydrogen production device respectively;

[0015] A methane purification unit, connected to the anaerobic digestion methane production device, is used to purify, store and utilize the obtained methane;

[0016] The cogeneration unit is connected to the methane purification unit, and utilizes the obtained methane to produce heat and electricity, and supplies the generated heat to the dark fermentation hydrogen production device, the anaerobic digestion methane production device and the biological hydrolysis device.

[0017] The second aspect of the present invention is to provide a method for cascade recovery of kitchen waste biomass energy resources, comprising the following steps:

[0018] S1) pre-treating kitchen waste and straw to obtain slurry and solid;

[0019] S2) subjecting the solid obtained in step S1 to solid phase treatment to obtain a product, and subjecting the product to resource treatment; the solid phase treatment includes biological hydrolysis treatment, biological fermentation treatment and biological composting treatment;

[0020] S3) subjecting the slurry obtained in step S1 to liquid phase treatment to obtain a treated liquid 1, hydrogen and methane; the liquid phase treatment includes dark fermentation hydrogen production treatment, microbial electrolysis cell hydrogen production treatment and anaerobic digestion methane production treatment;

[0021] S4) purifying the hydrogen and methane obtained in step S3 respectively, and then storing and utilizing them;

[0022] S5) The treated liquid 1 obtained in step S3 is subjected to solid-liquid separation to obtain treated liquid 2, and the treated liquid 2 is recycled.

[0023] As described above, the kitchen waste biomass energy resource cascade recovery system and recovery method of the present invention has the following features:

[0024] Beneficial effects:

[0025] (1) In the recycling method of the present invention, kitchen waste and straw are separated and co-fermented to produce hydrogen and methane step by step, thereby achieving efficient conversion of biomass energy and efficient recycling of resources; the addition of straw compensates for the defect of unstable components of kitchen waste and adjusts the carbon-nitrogen ratio, making the biological fermentation process more stable and reliable;

[0026] (2) The gas, liquid and solid generated in the recovery method of the present invention are effectively recovered and the resources are maximized, without the generation of three wastes; the generated hydrogen, methane and fermentation products have economic utilization value, among which methane compensates the power consumption and heat consumption of the treatment system through cogeneration, thus achieving energy self-sufficiency; the biological hydrolysis and biological fermentation devices recover and reuse the waste heat of the fermentation materials, reducing the energy input of the system and saving costs;

[0027] (3) The recycling system and recycling method of the present invention can be widely used in the fields of agriculture, environmental protection, energy, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 Shown is a system composition diagram of a cascade recovery method for kitchen waste biomass energy resources described in the present invention.

[0029] Figure 2 Shown is a process flow chart of a method for cascade recovery of kitchen waste biomass energy resources described in the present invention.

[0030] Description of Reference Numerals

[0031] 1. Pretreatment unit; 2. Solid phase treatment unit; 21. Biological hydrolysis device; 22. Biological fermentation device; 23. Biological composting device; 3. Product utilization unit; 4. Liquid phase treatment unit; 41. Dark fermentation hydrogen production device; 42. Microbial electrolysis cell hydrogen production device; 43. Anaerobic digestion methane production device; 5. Tail water utilization unit; 6. Hydrogen purification unit; 7. Methane purification unit; 8. Cogeneration unit; 9. Odor treatment unit; 10. Waste heat recovery unit. DETAILED DESCRIPTION

[0032] In order to make the purpose of the invention, technical solutions and beneficial technical effects of the present invention clearer, the present invention is further described in detail below in conjunction with embodiments. People familiar with this technology can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0033] The extended part of this application and the effect description of the extended part, including but not limited to subsequent data analysis, mechanism description, etc.

[0034] The first aspect of the present invention is to provide a kitchen waste biomass energy resource cascade recovery system, such as Figure 1 As shown, the recovery system comprises:

[0035] A pretreatment unit 1 is used to pretreat kitchen waste and straw to obtain slurry and solid;

[0036] The solid phase treatment unit 2 is used to treat the solid, and includes a biological hydrolysis device 21, a biological fermentation device 22 and a biological composting device 23 connected in sequence; the biological hydrolysis device 21 is connected to the pretreatment unit 1;

[0037] The product utilization unit 3 is connected to the biological composting device 23 and is used for resource utilization of the decomposed products;

[0038] The liquid phase treatment unit 4 is used to treat the slurry, and includes a dark fermentation hydrogen production device 41, a microbial electrolytic cell hydrogen production device 42 and an anaerobic digestion methane production device 43 which are connected in sequence; the dark fermentation hydrogen production device 41 is connected to the pretreatment unit 1;

[0039] The tail water utilization unit 5 is connected to the anaerobic digestion methanogen device 43 and is used for resource utilization of the methanogen fermentation liquid;

[0040] The hydrogen purification unit 6 is used to purify and store the obtained hydrogen, and is connected to the dark fermentation hydrogen production device 41 and the microbial electrolytic cell hydrogen production device 42 respectively;

[0041] A methane purification unit 7, connected to the anaerobic digestion methane production device 43, is used to purify, store and utilize the obtained methane;

[0042] The heat and power cogeneration unit 8 is connected to the methane purification unit 7 , and utilizes the obtained methane to perform heat and power cogeneration, and supplies the generated heat to the dark fermentation hydrogen production device 41 , the anaerobic digestion methane production device 43 and the biological hydrolysis device 21 .

[0043] The pretreatment unit 1 of the present invention obtains solids and slurry by sorting, mechanically crushing and dehydrating kitchen waste, and crushing and enzymatically treating straw, so as to provide a suitable material ratio for the subsequent system; after the kitchen waste and straw are treated, the solid enters the solid phase treatment unit 2, and the slurry and leachate produced by the solid phase treatment unit 2 then enter the liquid phase treatment unit 4, and is subjected to the dark fermentation hydrogen production device 41, and the obtained fermentation liquid is subjected to the microbial electrolytic cell hydrogen production device 42 after acid-base adjustment, and the fermentation liquid is then subjected to the anaerobic digestion methane production device 43, and finally tail water rich in nitrogen and phosphorus but low in organic matter is produced, and enters the tail water utilization unit 5. In this system, the hydrogen produced by the dark fermentation hydrogen production device 41 and the microbial electrolytic cell hydrogen production device 42 enters the hydrogen purification unit 6, and the methane produced by the anaerobic digestion methane production device 43 enters the methane purification unit 7 and the cogeneration unit 8 in sequence;

[0044] The pretreated solid materials and the residual sludge produced by the liquid phase treatment unit 4 are subjected to aerobic fermentation treatment. The solid materials enter the biological hydrolysis device 21, the biological fermentation device 22 and the biological decomposition device 23 in sequence, and the final decomposed and stable products enter the product utilization unit 3;

[0045] The tail water utilization unit 5 is connected to the liquid phase treatment unit 4 to treat or recycle the tail water produced by anaerobic fermentation. The tail water is rich in nutrients such as nitrogen and phosphorus and has a low organic matter content, and can be used for nearby agriculture or garden irrigation.

[0046] The product utilization unit 3 is connected to the solid phase treatment unit 2 to utilize the residues produced by aerobic fermentation. The product is rich in humus, nitrogen and phosphorus nutrients, etc., and can be used in nearby agriculture or gardening, or processed into bio-organic fertilizer for sale.

[0047] The main equipment of the hydrogen purification unit 6 of the present invention includes an adsorption tower, a separation membrane, a compressor and a gas storage bottle, and the membrane separation method is used to purify the hydrogen. After the obtained hydrogen is purified at the separation membrane, it is sent to the gas storage bottle for storage by a compressor, and is reserved for later transportation and use. The main equipment of the methane purification unit 7 includes an adsorption tower, a separation membrane, a compressor and a gas storage bottle, and the membrane separation method is used to purify the methane. After the obtained methane is purified at the separation membrane, it is sent to the gas storage bottle for storage by a compressor, and is reserved for later transportation and use.

[0048] In some embodiments of the present invention, the recovery system further includes an odor treatment unit 9, which is respectively connected to the biological hydrolysis device 21, the biological fermentation device 22 and the biological decomposition device 23; the odor treatment unit 9 is used to collect and treat the odor generated by the biological hydrolysis device 21, the biological fermentation device 22 and the biological decomposition device 23. The main equipment of the odor treatment unit 9 includes an exhaust fan, an odor collection pipeline, a biological deodorization filter tank, etc., and the biological deodorization method is used to remove the odor.

[0049] In some embodiments of the present invention, the recovery system further includes a waste heat recovery unit 10, which is connected to the biological hydrolysis device 21; the waste heat recovery unit 10 recovers the waste heat of the materials generated by the biological hydrolysis device 21 and the biological fermentation device 22, and is used for heat preservation of the biological hydrolysis device 21. The main equipment of the waste heat recovery unit 10 is a heat exchanger; the waste heat is obtained from the materials generated by the biological hydrolysis device 21 and the biological fermentation device 22 through the heat exchanger, and is used for heating and heat preservation of the biological hydrolysis device 21, thereby increasing the energy efficiency of the biological hydrolysis device 21.

[0050] In this system, a waste heat recovery unit 10 is provided to recover the waste heat of materials generated by biological hydrolysis and biological fermentation for heating and heat preservation of the biological hydrolysis device 21; an odor treatment unit 9 is provided to centrally treat the odor emitted from the solid phase treatment unit 2 and the material transfer equipment.

[0051] In some embodiments of the present invention, the solid phase treatment unit 2 is connected to the liquid phase treatment unit 4, the solid phase and residual sludge produced by the liquid phase treatment unit 4 enter the solid phase treatment unit 2, and the slurry and leachate produced by the solid phase treatment unit 2 enter the liquid phase treatment unit 4.

[0052] In some embodiments of the present invention, the solid phase treatment unit 2 is respectively connected to a dark fermentation hydrogen production device 41, a microbial electrolytic cell hydrogen production device 42, and an anaerobic digestion methane production device 43, and is used to treat the residual sludge produced by the pretreatment unit 1, the dark fermentation hydrogen production device 41, the microbial electrolytic cell hydrogen production device 42, and the anaerobic digestion methane production device 43. The present invention does not limit the dark fermentation hydrogen production device 41, and a dark fermentation hydrogen production device 41 commonly used in the art can be used. Specifically, the dark fermentation hydrogen production device 41 can be a fermentation tank or a CSTR reactor. The present invention does not limit the microbial electrolytic cell, and a microbial electrolytic cell commonly used in the art can be used. The present invention does not limit the anaerobic digestion system, and an anaerobic digestion system commonly used in the art can be used. Specifically, it can be selected from a fermentation tank or an anaerobic reactor. The present invention does not specifically limit the anaerobic reactor, and an anaerobic reactor used in the art can be used.

[0053] In some embodiments of the present invention, the liquid phase treatment unit 4 is respectively connected to the biological hydrolysis device 21, the biological fermentation device 22, and the biological decomposition device 23, and is used to treat the leachate produced by the pretreatment unit 1, the biological hydrolysis device 21, the biological fermentation device 22, and the biological decomposition device 23. The commonly used equipment for the biological hydrolysis device 21 is a biological hydrolysis reactor; the present invention has no limitation on the biological hydrolysis reactor, and a commonly used biological hydrolysis reactor in the art can be used; the commonly used equipment for the biological fermentation device 22 of the present invention is a biological fermentation device; the present invention has no limitation on the biological fermentation device, and a commonly used biological fermentation device in the art can be used; the commonly used equipment for the biological decomposition device 23 of the present invention is a biological decomposition device, and the present invention has no limitation on the biological decomposition device 23, and a commonly used biological decomposition device 23 in the art can be used. Specifically, the biological fermentation device 22 of the present invention is a fermentation tank. When in use, the solid mixture with adjusted moisture content is transported into the fermentation tank, and then EM bacteria are added into the fermentation tank to achieve fermentation of the solid mixture; the biological composting device 23 of the present invention is a Dano-type fermentation drum, which further composts and ages the solid mixture. This process does not require oxygen supply, and the rotation of the drum is used to achieve stirring of the material.

[0054] In some embodiments of the present invention, the pretreatment unit 1 includes a sorting and impurity removal device, a mechanical crushing device, an extrusion dehydration device, and an enzymatic hydrolysis device; the sorting and impurity removal device is used to sort and remove impurities from kitchen waste and recover crude oil at the same time, the mechanical crushing device is used to crush the sorted kitchen waste, and then extrusion dehydration; the enzymatic hydrolysis device is used to enzymatically hydrolyze the straw. The commonly used equipment for the sorting and impurity removal device is a sorting machine. The mechanical crushing device is a double-axis kitchen waste shredder commonly used in the art; the enzymatic hydrolysis device is an integrated stirred tank reactor commonly used in the art.

[0055] In some embodiments of the present invention, a three-phase separator 1 is provided between the dark fermentation hydrogen production device 41 and the microbial electrolytic cell hydrogen production device 42, and the three-phase separator 1 is respectively connected to the microbial electrolytic cell hydrogen production device 42 and the hydrogen purification unit 6. The present invention has no limitation on the three-phase separator 1, and a three-phase separator commonly used in the art can be used.

[0056] In some embodiments of the present invention, the microbial electrolytic cell hydrogen production device 42 includes a dual-chamber reactor, and the dual-chamber reactor is connected to the hydrogen purification unit 6 and the anaerobic digestion methanogen production device 43 respectively.

[0057] In some embodiments of the present invention, a three-phase separator 2 is provided between the anaerobic digestion methanogen 43 and the tail water utilization unit 5, and the three-phase separator 2 is respectively connected to the methane purification unit 7 and the tail water utilization unit 5. The present invention has no limitation on the three-phase separator 2, and a three-phase separator commonly used in the art can be used.

[0058] In some embodiments of the present invention, the main equipment of the cogeneration unit 8 includes a methane pretreatment device, a gas turbine power generation device and a waste heat recovery device. After the methane obtained by fermentation is pretreated, cogeneration is carried out in the gas turbine power generation device, and while obtaining electricity, waste heat is recovered for heat preservation of the fermentation methane production system and heating of the hydrothermal pretreatment unit.

[0059] The second aspect of the present invention is to provide a method for cascade recovery of kitchen waste biomass energy resources, such as Figure 2 As shown, the following steps are included:

[0060] S1) pre-treating kitchen waste and straw to obtain slurry and solid;

[0061] S2) subjecting the solid obtained in step S1 to solid phase treatment to obtain a product, and subjecting the product to resource treatment; the solid phase treatment includes biological hydrolysis treatment, biological fermentation treatment and biological composting treatment;

[0062] S3) subjecting the slurry obtained in step S1 to liquid phase treatment to obtain a treated liquid 1, hydrogen and methane; the liquid phase treatment includes dark fermentation hydrogen production treatment, microbial electrolysis cell hydrogen production treatment and anaerobic digestion methane production treatment;

[0063] S4) purifying the hydrogen and methane obtained in step S3 respectively, and then storing and utilizing them;

[0064] S5) The treated liquid 1 obtained in step S3 is subjected to solid-liquid separation to obtain treated liquid 2, and the treated liquid 2 is recycled.

[0065] In some embodiments of the present invention, the kitchen waste is kitchen waste generated by the classification of urban waste; preferably, the kitchen waste is selected from one or more of vegetables, melon and fruit peels, meat and eggs and processed food, leftovers, shrimp shells, tea residues, eggshell residues, and discarded food seasonings;

[0066] In some embodiments of the present invention, the straw is selected from agricultural waste, preferably, the straw is selected from one or more of rice straw, wheat straw, corn straw, and peanut straw; the pretreatment of the straw is enzymatic treatment; preferably, the TCOD of the pretreated straw slurry is 20-80g / L, and the carbon-nitrogen ratio is 20-50:1. The enzyme used in the enzymatic hydrolysis is selected from cellulase, hemicellulase, and lignin degradation enzyme; the temperature of the enzymatic hydrolysis is 40-60°C; the time of the enzymatic hydrolysis is 12-80h; the pH of the enzymatic hydrolysis is 4-6; preferably, the enzyme used in the enzymatic hydrolysis is selected from one or more of CMC enzyme, FPA enzyme, and β-glucosidase. The present invention does not specifically limit the source of the enzyme used in the enzymatic hydrolysis, and commercially available products of enzymes used by those skilled in the art can be used.

[0067] In some embodiments of the present invention, the pretreatment of the kitchen waste comprises the following steps: sorting and removing impurities from the kitchen waste, recovering crude oil, and then mechanically crushing and squeezing and dehydrating; the moisture content of the kitchen waste is 80-90%, the volatile solid content is 85-95%, and the TCOD is 100-200g / L; the slurry of the pretreated kitchen waste has a pH of 4-6, SS2-5g / L, TCOD 20-100g / L, TN 0.5-5g / L, and TP 0.3-1g / L;

[0068] In some embodiments of the present invention, the leachate produced during the solid phase treatment is subjected to liquid phase treatment;

[0069] In some embodiments of the present invention, the excess sludge generated during the liquid phase treatment is subjected to solid phase treatment in sequence after dehydration;

[0070] In some embodiments of the present invention, the odor generated during the solid phase treatment process and the material transfer process is collected and treated; the odor treatment adopts microbial deodorant treatment, preferably, the treatment is spray deodorization, and the biological deodorant is a collection of multiple functional microorganisms; further preferably, the biological deodorant is selected from one or more of photosynthetic bacteria, lactic acid bacteria, yeast, Pseudomonas, Bacillus, and Alcaligenes faecalis; the present invention has no special limitation on the source of the biological deodorant, and the commercially available products of the biological deodorants used by those skilled in the art can be used.

[0071] In some embodiments of the present invention, the waste heat of the materials generated by the biological hydrolysis treatment and the biological fermentation treatment is recovered and used for heat preservation during the biological hydrolysis treatment;

[0072] In some embodiments of the present invention, the temperature of the biological hydrolysis is 50-60°C; the solid retention time is 8-12 hours, and the moisture content of the kitchen waste decreases from 75% to 65%;

[0073] In some embodiments of the present invention, the temperature of the biological fermentation is 55-75°C; the solid retention time is 3-5 days; the moisture content of the kitchen waste is reduced from 65% to 50-55%; aerobic fermentation microorganisms are inoculated during the biological fermentation;

[0074] In some embodiments of the present invention, the solid residence time in the biological composting stage is 15-20 days, and the moisture content of the kitchen waste decreases from 50-55% to 35-45%;

[0075] In some embodiments of the present invention, in step S3, during the dark fermentation treatment, efficient hydrogen-producing bacteria are inoculated and / or activated carbon is added; the biological retention capacity of the reactor is improved; the efficient hydrogen-producing bacteria are selected from one or more of Clostridium, ethanol bacteria, Enterobacter, thermophilic bacteria, Bacillus, Paenibacillus, Citrobacter, and Thermocystis; in addition, the efficient hydrogen-producing bacteria can also be obtained by laboratory domestication and separation; the specific surface area of ​​the activated carbon is 800-1500m 2 / g. The present invention has no special limitation on the source of the bacteria used for efficient hydrogen production, and the bacteria used by technical researchers in universities in the field can be used.

[0076] In some embodiments of the present invention, after the fermentation liquid after the dark fermentation hydrogen production treatment in step S3 is subjected to three-phase separation, the liquid enters the microbial electrolysis cell for hydrogen production treatment, the generated hydrogen is purified, the microbial solids are retained in the reactor for reuse, and the remaining sludge is subjected to solid phase treatment; the microbial solids are mainly microorganisms involved in the degradation of substances. After the three-phase separation, these microorganisms will remain in the reactor and continue to play a role, but at the same time, residual sludge (microbial metabolic residues) will also be generated, and the residual sludge needs to enter the solid phase treatment unit; the microbial electrolysis cell produces hydrogen The applied voltage of the treatment is 0.6-1.2V; the temperature is 25-35°C; the hydraulic retention time is 8-16h, and the pH is 6-8; preferably, the applied voltage is 0.8V; the temperature is 30°C; the hydraulic retention time is 12h; after the hydrogen production treatment in the microbial electrolysis cell is started, highly active exogenous electric bacteria and fermentation bacteria can be inoculated; a part of the remaining sludge is returned to dark fermentation to provide efficient and active hydrogen-producing bacteria; the solid phase needs to be regularly discharged to maintain a stable solid content, and the remaining sludge is dehydrated and then enters the solid phase treatment unit for treatment;

[0077] In some embodiments of the present invention, the hydrogen produced by the hydrogen production treatment in the microbial electrolysis cell in step S3 is purified, the produced liquid is subjected to anaerobic digestion and methanogenesis treatment, the microbial solids are retained in the reactor for reuse, and the remaining sludge is subjected to solid phase treatment; the microbial solids mainly include microorganisms involved in the degradation of substances. After the three-phase separation, these microorganisms will remain in the reactor and continue to play a role, but at the same time, residual sludge (microbial metabolic residues) will also be generated, and the residual sludge needs to enter the solid phase treatment unit; the reaction conditions of the anaerobic digestion are temperature 30-55°C, initial pH 6-9, and hydraulic retention time (HRT) 15-25d; preferably, the temperature is 50-55°C, pH is 7-8; the hydraulic retention time is 20d; the anaerobic digestion is initially inoculated with highly active methanogens or sludge rich in methanogens; after stable operation, a portion of the anaerobic digested sludge is returned to dark fermentation; the present invention has no limitation on methanogens, and methanogens commonly used in the art can be used. The solid phase needs to be discharged regularly to maintain a stable solid content, and the remaining sludge enters the solid phase treatment unit for treatment after dehydration.

[0078] In some embodiments of the present invention, the temperature of dark fermentation in step S3 is 30-55°C; the initial pH is 5-9; and the hydraulic retention time is 10-72h; preferably, the temperature is 50-55°C; the initial pH is 6-8; and the hydraulic retention time is 24-48h.

[0079] In some embodiments of the present invention, the purified methane is subjected to heat and electricity cogeneration treatment, and the generated heat is supplied to dark fermentation hydrogen production treatment, anaerobic digestion methanogenesis treatment, and biological hydrolysis treatment.

[0080] The present invention is further described below by way of examples, but the scope of the present invention is not limited thereto.

[0081] When the embodiment gives a numerical range, it should be understood that, unless otherwise specified in the present invention, the two endpoints of each numerical range and any numerical value between the two endpoints can be selected. Unless otherwise defined, all technical and scientific terms used in the present invention have the same meaning as those generally understood by those skilled in the art. If specific conditions are not specified in the embodiment, they are carried out according to normal conditions or conditions recommended by the manufacturer. If the manufacturer is not specified for all reagents or instruments, they are conventional products that can be purchased commercially. In addition to the specific methods, equipment, and materials used in the embodiments, according to the grasp of the prior art by those skilled in the art and the record of the present invention, any method, equipment, and material of the prior art similar or equivalent to the method, equipment, and material in the embodiments of the present invention can also be used to realize the present invention.

[0082] The exogenous electrogenic bacteria in this embodiment are specifically Geobacter, which is commonly found in microbial electrochemical systems and is an electroactive bacterium that can grow using acetic acid and conduct extracellular electron transfer. Specifically, Geobacter sulfurreducens, which is a typical strain preserved by ATCC: ATCC 51573.

[0083] The biological deodorant of this embodiment is specifically a composite bacterial agent such as yeast, lactic acid bacteria, and Bacillus; the manufacturer is Shandong Jingbei Environmental Technology Co., Ltd.; the effective live bacteria count is 10 billion / mL.

[0084] The efficient hydrogen-producing bacteria in this embodiment are specifically ethanologenic bacteria; the deposit number is CGMCC No.1152.

[0085] Example

[0086] Example 1

[0087] This embodiment provides a kitchen waste biomass energy resource cascade recovery system, the recovery system comprising:

[0088] The pretreatment unit 1 is used to pretreat kitchen waste and straw to obtain slurry and solid; the pretreatment unit 1 includes a sorting and impurity removal device, a mechanical crushing device, an extrusion dehydration device, and an enzymatic hydrolysis device; the sorting and impurity removal device is used to sort and remove kitchen waste and recover crude oil at the same time, the mechanical crushing device is used to crush the sorted kitchen waste and then extrusion dehydrate it; the enzymatic hydrolysis device is used to perform enzymatic hydrolysis on the straw;

[0089] The solid phase treatment unit 2 is used to treat the solid, and includes a biological hydrolysis device 21, a biological fermentation device 22 and a biological composting device 23 connected in sequence; the biological hydrolysis device 21 is connected to the pretreatment unit 1;

[0090] The product utilization unit 3 is connected to the biological composting device 23 and is used for resource utilization of the decomposed products;

[0091] The liquid phase treatment unit 4 is used to treat the slurry, and includes a dark fermentation hydrogen production device 41, a microbial electrolysis cell hydrogen production device 42 and an anaerobic digestion methane production device 43 which are connected in sequence; the dark fermentation hydrogen production device 41 is connected to the pretreatment unit 1; a three-phase separator 1 is arranged between the dark fermentation hydrogen production device 41 and the microbial electrolysis cell hydrogen production device 42, and the three-phase separator 1 is respectively connected to the microbial electrolysis cell hydrogen production device 42, the hydrogen purification unit 6, and the biological hydrolysis device 21; the microbial electrolysis cell hydrogen production device 42 includes a double-chamber reactor, and the double-chamber reactor is respectively connected to the hydrogen purification unit 6 and the anaerobic digestion methane production device 43;

[0092] The tail water utilization unit 5 is connected to the anaerobic digestion methanogen device 43 and is used for resource utilization of the methanogen fermentation liquid;

[0093] The hydrogen purification unit 6 is used to purify, store and utilize the obtained hydrogen, and is connected to the dark fermentation hydrogen production device 41 and the microbial electrolytic cell hydrogen production device 42 respectively;

[0094] The methane purification unit 7 is connected to the anaerobic digestion methanogen 43 and is used to purify and store the obtained methane; a three-phase separator 2 is arranged between the anaerobic digestion methanogen 43 and the tail water utilization unit 5, and the three-phase separator 2 is respectively connected to the methane purification unit 7, the tail water utilization unit 5, and the biological hydrolysis device 21;

[0095] The heat and power cogeneration unit 8 is connected to the methane purification unit 7, and utilizes the obtained methane to perform heat and power cogeneration, and supplies the generated heat to the dark fermentation hydrogen production device 41, the anaerobic digestion methane production device 43 and the biological hydrolysis device 21;

[0096] The recycling system further includes an odor treatment unit 9, which is connected to the biological hydrolysis device 21, the biological fermentation device 22 and the biological decomposition device 23 respectively; the odor treatment unit 9 is used to collect and treat the odor generated by the biological hydrolysis device 21, the biological fermentation device 22 and the biological decomposition device 23;

[0097] The recovery system further includes a waste heat recovery unit 10, which is connected to the biological hydrolysis device 21; the waste heat recovery unit 10 is used for heat preservation of the biological hydrolysis device 21 by recovering the waste heat of the materials generated by the biological hydrolysis device 21 and the biological fermentation device 22;

[0098] The solid phase treatment unit 2 is connected to the liquid phase treatment unit 4. The residual sludge produced by the liquid phase treatment unit 4 enters the solid phase treatment unit 2 after dehydration, and the leachate produced by the solid phase treatment unit 2 enters the liquid phase treatment unit 4. The solid phase treatment unit 2 is respectively connected to the dark fermentation hydrogen production device 41, the microbial electrolysis cell hydrogen production device 42, and the anaerobic digestion methane production device 43, and is used to treat the residual sludge produced by the dark fermentation hydrogen production device 41, the microbial electrolysis cell hydrogen production device 42, and the anaerobic digestion methane production device 43. The liquid phase treatment unit 4 is respectively connected to the biological hydrolysis device 21, the biological fermentation device 22, and the biological decomposition device 23, and is used to treat the leachate produced by the biological hydrolysis device 21, the biological fermentation device 22, and the biological decomposition device 23.

[0099] Example 2

[0100] This embodiment provides a method for cascade recovery of kitchen waste biomass energy resources, comprising the following steps:

[0101] S1) pre-treating kitchen waste and straw to obtain slurry and solid; the kitchen waste is vegetable and fruit peels; the moisture content of the kitchen waste is 85%, the volatile solid content is 90%, and the TCOD is 150g / L; the pre-treatment of the kitchen waste includes the following steps: sorting and removing impurities from the kitchen waste, recovering crude oil and fat, and then mechanically crushing and squeezing and dehydrating; the slurry of the pre-treated kitchen waste has a pH of 5, SS 4g / L, TCOD 70g / L, TN 4g / L, and TP 2g / L; the pre-treatment of the straw is enzymatic hydrolysis, and the carbon-nitrogen ratio of the pre-treated straw slurry is 30:1; the enzyme used in the enzymatic hydrolysis is CMC enzyme; the enzymatic hydrolysis temperature is 55°C; the enzymatic hydrolysis time is 72h; the enzymatic hydrolysis pH is 4.8; wherein the kitchen waste is kitchen waste classified by municipal waste, and comes from the feed of the kitchen waste disposal project in Jinshan District, Shanghai;

[0102] S2) solid phase treatment of the solid obtained in step S1 to obtain a product, and the product is subjected to resource treatment; the solid phase treatment includes biological hydrolysis treatment, biological fermentation treatment and biological composting treatment; the residual sludge generated in the liquid phase treatment process enters the solid phase treatment unit 2 in turn for solid phase treatment; the odor generated in the solid phase treatment process and the material transfer process is collected and treated; the odor treatment adopts biological deodorant spray deodorization; the waste heat of the material generated by the biological hydrolysis treatment and biological fermentation treatment is treated by waste heat recovery for heat preservation in the biological hydrolysis treatment process; the temperature of the biological hydrolysis is 55°C; the solid retention time is 10h, and the moisture content of the kitchen waste is reduced from 75% to 65%; the temperature of the biological fermentation is 65°C; the solid retention time is 4d; the moisture content of the kitchen waste is reduced from 65% to 53%; aerobic fermentation microorganisms are inoculated during the biological fermentation; the solid retention time in the biological composting stage is 18d, and the moisture content of the kitchen waste is reduced from 53% to 40%;

[0103] S3) The slurry obtained in step S1 is subjected to liquid phase treatment to obtain a treatment liquid 1, hydrogen and methane; the liquid phase treatment includes dark fermentation hydrogen production treatment, microbial electrolysis cell hydrogen production treatment and anaerobic digestion methane production treatment; the leachate produced during the solid phase treatment enters the liquid phase treatment unit 4 for liquid phase treatment; in the dark fermentation treatment in step S3, an efficient hydrogen-producing strain is inoculated, and activated carbon is added, and the specific surface area of ​​the activated carbon is 1000m 2 / g; the efficient hydrogen-producing bacteria is ethanologenic bacteria; the specific surface area of ​​the activated carbon is 800-1500m 2 / g; after the fermentation liquid after the dark fermentation hydrogen production treatment in step S3 is separated into three phases, the liquid enters the microbial electrolysis cell for hydrogen production treatment, the generated hydrogen is purified, the microbial solids are retained in the reactor for reuse, and the remaining sludge is subjected to solid phase treatment; the applied voltage for hydrogen production treatment in the microbial electrolysis cell is 1V; the temperature is 30°C; the hydraulic retention time is 10h, and the pH is 7; preferably, the applied voltage is 0.8V; the temperature is 30°C; the hydraulic retention time is 12h; after the hydrogen production treatment in the microbial electrolysis cell is started, highly active exogenous electric bacteria Geobacter can be inoculated; a portion of the remaining sludge is returned to the dark fermentation to provide efficient and active hydrogen-producing bacteria; the hydrogen generated by the hydrogen production treatment in the microbial electrolysis cell in step S3 is purified, the generated liquid is subjected to anaerobic digestion and methanogenesis treatment, the microbial solids are retained in the reactor for reuse, and the remaining sludge is subjected to solid phase treatment; the reaction conditions for the anaerobic digestion are a temperature of 55°C, an initial pH 8, hydraulic retention time (HRT) 20d; the anaerobic digestion is initially inoculated with highly active sludge rich in methanogens, which comes from a sludge treatment plant; after stable operation, a portion of the anaerobic digestion sludge is returned to dark fermentation; the temperature of the dark fermentation in step S3 is 50°C; the initial pH is 8; the hydraulic retention time is 40h;

[0104] S4) purifying and refining the hydrogen and methane obtained in step S3 respectively, and then storing and utilizing them; the purified methane is subjected to heat and electricity cogeneration treatment, and the generated heat is supplied to dark fermentation hydrogen production treatment, anaerobic digestion methane production treatment, and biological hydrolysis treatment;

[0105] S5) The treated liquid 1 obtained in step S3 is subjected to solid-liquid separation to obtain treated liquid 2, and the treated liquid 2 is recycled.

[0106] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical ideas disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A kitchen waste biomass energy resource cascade recovery system, characterized in that: The recovery system comprises: A pretreatment unit (1) is used to pretreat kitchen waste and straw to obtain slurry and solid; A solid phase treatment unit (2) is used to treat solids, comprising a biological hydrolysis device (21), a biological fermentation device (22) and a biological decomposition device (23) connected in sequence; the biological hydrolysis device (21) is connected to the pretreatment unit (1); The product utilization unit (3) is connected to the biological decomposition device (23) and is used for resource processing of the decomposed product; the liquid phase treatment unit (4) is used for processing the slurry, and includes a dark fermentation hydrogen production device (41), a microbial electrolytic cell hydrogen production device (42) and an anaerobic digestion methane production device (43) which are connected in sequence; the dark fermentation hydrogen production device (41) is connected to the pretreatment unit (1); A tail water utilization unit (5), connected to the anaerobic digestion methanogen device (43), is used for resource utilization of the methanogen fermentation liquid; A hydrogen purification unit (6) is used to purify and store the obtained hydrogen, and is connected to the dark fermentation hydrogen production device (41) and the microbial electrolytic cell hydrogen production device (42) respectively; A methane purification unit (7), connected to the anaerobic digestion methane production device (43), is used to purify, store and utilize the obtained methane; The heat and power cogeneration unit (8) is connected to the methane purification unit (7), utilizes the obtained methane to produce heat and power, and supplies the generated heat to the dark fermentation hydrogen production device (41), the anaerobic digestion methane production device (43) and the biological hydrolysis device (21).

2. The kitchen waste biomass energy resource cascade recovery system according to claim 1 is characterized by: Also includes one or more of the following features: 1) The recovery system further comprises an odor treatment unit (9), wherein the odor treatment unit (9) is respectively connected to the biological hydrolysis device (21), the biological fermentation device (22) and the biological decomposition device (23); the odor treatment unit (9) is used to collect and treat the odor generated by the biological hydrolysis device (21), the biological fermentation device (22) and the biological decomposition device (23); 2) The recovery system further comprises a waste heat recovery unit (10), wherein the waste heat recovery unit (10) is connected to the biological hydrolysis device (21); the waste heat recovery unit (10) recovers waste heat of materials generated by the biological hydrolysis device (21) and the biological fermentation device (22) to keep the biological hydrolysis device (21) warm.

3. The kitchen waste biomass energy resource cascade recovery system according to claim 2 is characterized by: The solid phase treatment unit (2) is connected to the liquid phase treatment unit (4); the residual sludge produced by the liquid phase treatment unit (4) enters the solid phase treatment unit (2); and the slurry produced by the solid phase treatment unit (2) enters the liquid phase treatment unit (4).

4. The kitchen waste biomass energy resource cascade recovery system according to claim 2 is characterized by: Also includes one or more of the following characteristics: 3) The solid phase treatment unit (2) is respectively connected to the dark fermentation hydrogen production device (41), the microbial electrolytic cell hydrogen production device (42), and the anaerobic digestion methane production device (43), and is used to treat the residual sludge produced by the pretreatment unit (1), the dark fermentation hydrogen production device (41), the microbial electrolytic cell hydrogen production device (42), and the anaerobic digestion methane production device (43); 4) the liquid phase treatment unit (4) is respectively connected to the biological hydrolysis device (21), the biological fermentation device (22), and the biological decomposition device (23), and is used to treat the leachate generated by the pretreatment unit (1), the biological hydrolysis device (21), the biological fermentation device (22), and the biological decomposition device (23); 5) The pretreatment unit (1) comprises a sorting and impurity removal device, a mechanical crushing device, an extrusion dehydration device, and an enzymatic hydrolysis device; the sorting and impurity removal device is used to sort and remove impurities from kitchen waste and recover crude oil; the mechanical crushing device is used to crush the sorted kitchen waste and then extrusion dehydrate it; the enzymatic hydrolysis device is used to perform enzymatic hydrolysis on the straw; 6) A three-phase separator is provided between the dark fermentation hydrogen production device (41) and the microbial electrolytic cell hydrogen production device (42), and the three-phase separator is connected to the microbial electrolytic cell hydrogen production device (42) and the hydrogen purification unit (6) respectively; 7) The microbial electrolytic cell hydrogen production device (42) comprises a dual-chamber reactor, and the dual-chamber reactor is respectively connected to a hydrogen purification unit (6) and an anaerobic digestion methane production device (43); 8) A three-phase separator 2 is provided between the anaerobic digestion methane production device (43) and the tail water utilization unit (5), and the three-phase separator 2 is connected to the methane purification unit (7) and the tail water utilization unit (5) respectively.

5. A method for cascade recovery of kitchen waste biomass energy resources, characterized in that: The steps include: S1) pre-treating kitchen waste and straw to obtain slurry and solid; S2) subjecting the solid obtained in step S1 to solid phase treatment to obtain a product, and subjecting the product to resource treatment; the solid phase treatment includes biological hydrolysis treatment, biological fermentation treatment and biological composting treatment; S3) subjecting the slurry obtained in step S1 to liquid phase treatment to obtain a treated liquid 1, hydrogen and methane; the liquid phase treatment includes dark fermentation hydrogen production treatment, microbial electrolysis cell hydrogen production treatment and anaerobic digestion methane production treatment; S4) purifying the hydrogen and methane obtained in step S3 respectively, and then storing and utilizing them; S5) The treated liquid 1 obtained in step S3 is subjected to solid-liquid separation to obtain treated liquid 2, and the treated liquid 2 is recycled.

6. The method for cascade recovery of kitchen waste biomass energy resources according to claim 5, characterized in that: The steps S1 also includes one or more of the following features: S11) the kitchen waste is kitchen waste generated by urban waste classification; preferably, the kitchen waste is selected from one or more of vegetables, melon and fruit peels, meat and eggs and processed food, leftovers, shrimp shells, tea residues, eggshell residues, and discarded food seasonings; S12) the straw is agricultural waste, preferably, the straw is selected from one or more of rice straw, wheat straw, corn straw, and peanut straw; S13) The pretreatment of the kitchen waste comprises the following steps: sorting and removing impurities from the kitchen waste, recovering crude oil, and then mechanically crushing and squeezing and dehydrating the kitchen waste; S14) The pretreatment of the straw is enzymatic treatment; S15) the kitchen waste has a moisture content of 80-90%, a volatile solid content of 85-95%, and a TCOD of 100-200 g / L; S16) the slurry of the pretreated kitchen waste has a pH of 4-6, SS2-5 g / L, TCOD 20-100 g / L, TN 0.5-5 g / L, TP 0.3-1g / L; S17) The TCOD of the pretreated straw slurry is 20-80 g / L, and the carbon-nitrogen ratio is 20-50:

1.

7. The method for cascade recovery of kitchen waste biomass energy resources according to claim 6, characterized in that: The enzyme used in the enzymatic hydrolysis method is selected from cellulase, hemicellulase, and lignin degrading enzyme; the temperature of the enzymatic hydrolysis is 40-60°C; the time of the enzymatic hydrolysis is 12-80h; the pH of the enzymatic hydrolysis is 4-6; preferably, the enzyme used in the enzymatic hydrolysis method is selected from one or more of CMC enzyme, FPA enzyme and β-glucosidase.

8. The method for cascade recovery of kitchen waste biomass energy resources according to claim 5, characterized in that: Also includes one or more of the following characteristics: S21) subjecting the leachate produced during the solid phase treatment to liquid phase treatment; S22) The excess sludge generated in the liquid phase treatment process is dehydrated and then subjected to solid phase treatment in sequence; S23) collecting and treating the odor generated during the solid phase treatment process and the material transfer process; S24) the waste heat of the materials generated by the biological hydrolysis treatment and the biological fermentation treatment is recovered and used for heat preservation during the biological hydrolysis treatment; S25) the temperature of the biological hydrolysis treatment is 50-60°C; the solid retention time is 8-12h, and the moisture content of the kitchen waste is reduced from 75% to 65%; S26) the temperature of the biological fermentation treatment is 55-75°C; The solid retention time is 3-5 days; the moisture content of the kitchen waste is reduced from 65% to 50-55%; aerobic fermentation microorganisms are inoculated during the biological fermentation treatment; S27) the solid residence time during the biological composting treatment is 15-20 days, and the moisture content of the kitchen waste decreases from 50-55% to 35-45%; S31) The temperature of the dark fermentation hydrogen production treatment in step S3 is 30-55°C; the initial pH is 5-9; the hydraulic retention time is 10-72h; preferably, the temperature is 50-55°C; the initial pH is 6-8; the hydraulic retention time is 24-48h; S32) in the dark fermentation process in step S3, inoculating efficient hydrogen-producing bacteria, and / or adding activated carbon carrier; S33) After the fermentation liquid after dark fermentation hydrogen production treatment in step S3 is subjected to three-phase separation, the liquid enters the microbial electrolysis cell for hydrogen production treatment, the generated hydrogen is purified, the microbial solids are retained in the reactor for reuse, and the residual sludge is subjected to solid phase treatment; S34) The hydrogen produced by the hydrogen production process in the microbial electrolysis cell in step S3 is purified, the produced liquid is subjected to anaerobic digestion and methanogenesis, the microbial solids are retained in the reactor for reuse, and the remaining sludge is subjected to solid phase treatment.

9. The method for cascade recovery of kitchen waste biomass energy resources according to claim 8, characterized in that: Also includes one or more of the following characteristics: S231) The odor treatment is carried out by using a microbial deodorant. Preferably, the treatment is spray deodorization, and the biological deodorant is a collection of multiple functional microorganisms; further preferably, the biological deodorant is selected from one or more of photosynthetic bacteria, lactic acid bacteria, yeast, Pseudomonas, Bacillus, and Alcaligenes faecalis; S321) The efficient hydrogen-producing bacteria are selected from one or more of Clostridium, Ethanol, Enterobacter, Thermobacterium, Bacillus, Paenibacillus, Citrobacter, and Thermosporium; S322) The specific surface area of ​​the activated carbon is 800-1500m 2 / g; S331) The applied voltage of the microbial electrolytic cell for hydrogen production treatment is 0.6-1.2V; the temperature is 25-35°C; the hydraulic retention time is 8-16h, and the pH is 6-8; preferably, the applied voltage is 0.8V; the temperature is 30°C; The hydraulic retention time is 12h; S332) After the hydrogen production process of the microbial electrolysis cell is started, highly active exogenous electric bacteria can be inoculated; a portion of the remaining sludge is returned to dark fermentation to provide highly efficient and active hydrogen-producing bacteria; preferably, the exogenous electric bacteria are selected from one or more of Geobacter, Desulfovibrio, Clostridium, Bacillus, thermophilic bacteria, and photosynthetic bacteria; S341) The reaction conditions of the anaerobic digestion methanogenesis treatment are a temperature of 30-55°C, an initial pH of 6-9, and a hydraulic retention time (HRT) of 15-25 days; preferably, the temperature is 50-55°C, the pH is 7-8, and the hydraulic retention time is 20 days; S342) The anaerobic digestion methanogenesis treatment is initially inoculated with highly active methanogens or sludge rich in methanogens; after the operation is stable, a portion of the anaerobic digestion sludge is returned to dark fermentation.

10. The method for cascade recovery of kitchen waste biomass energy resources according to claim 8, characterized in that: The purified methane is subjected to heat and electricity cogeneration treatment, and the generated heat is supplied to dark fermentation hydrogen production treatment, anaerobic digestion methane production treatment, and biological hydrolysis treatment.

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