Kitchen waste resource treatment system and method, electronic device and storage medium

Abstract

The embodiment of the application provides a kitchen waste resource processing system and method, electronic equipment and storage medium, relates to the kitchen waste processing technical field, and based on a hot hydrolysis phase separation module, kitchen waste is subjected to hot hydrolysis treatment, and kitchen waste after hot hydrolysis treatment is obtained; based on the oil-liquid-solid three-phase separation module, the kitchen waste after the hot hydrolysis treatment is subjected to oil-liquid-solid three-phase separation treatment, the oil phase is input into the grease recovery module through the oil phase outlet for grease recovery treatment, the liquid phase is input into the liquid phase biological fermentation module through the liquid phase outlet for primary filamentous fungal fermentation treatment, and the solid phase is input into the solid phase cascade conversion module through the solid phase outlet for lactic acid fermentation treatment. The technical scheme of the application can solve the problem that the traditional kitchen waste processing scheme is difficult to realize multi-stage resourceization cooperation.

Description

Technical Field

[0001] This application relates to the field of food waste treatment technology, and in particular to a food waste resource recovery system, method, electronic device, and storage medium. Background Technology

[0002] Currently, with the continuous growth of the catering service industry and urban consumption, food waste has become a core component of urban organic solid waste. Its treatment and disposal efficiency directly affects the level of urban environmental governance and the capacity for solid waste resource utilization. Food waste generally has the physicochemical characteristics of high water content, a large proportion of oil components, and abundant soluble organic matter and solid organic residue. It poses both environmental risks of easy spoilage and secondary pollution, and significant resource development value due to its high organic matter content. Currently, conventional treatment methods for food waste in the industry cover various technical routes such as oil-water separation, anaerobic digestion, aerobic composting, feed production, incineration, pyrolysis, and gasification. How to achieve harmless, efficient, and high-value treatment of food waste has become a key research direction in the field of solid waste treatment.

[0003] Among related technologies, conventional treatment routes for food waste generally suffer from limitations such as a single resource recovery dimension and insufficient comprehensive treatment efficiency: oil-water separation can only achieve the single recovery of crude oil, and a large amount of soluble organic matter cannot be utilized at a high value; anaerobic digestion processes are easily affected by the inhibitory effect of high oil components, resulting in long treatment cycles and unstable gas production efficiency; aerobic composting processes require a large area, have high odor control costs, and low product added value; feed treatment poses biosafety risks and limits application scenarios; thermal treatment processes such as incineration and pyrolysis gasification are constrained by the high moisture content of food waste, resulting in high energy consumption and operating costs, making it difficult to achieve economical and efficient large-scale application. To overcome the aforementioned bottlenecks, related research has proposed a technical approach combining hydrothermal pretreatment with liquid-solid separation. This approach enhances the dissolution of organic matter and the release of oils through hydrothermal reactions, improving the efficiency of organic matter release and oil recovery in the supernatant (for example, the changes in organic matter release, oil recovery, and lactic acid fermentation performance of the supernatant after hydrothermal pretreatment of kitchen waste at 80°C-140°C for 30 minutes). Simultaneously, the separated liquid components can be directly used as fermentable substrates for lactic acid fermentation, achieving synergistic resource recovery of multiple products. However, the hydrothermal pretreatment methods disclosed in traditional solutions only preliminarily characterize the performance changes of organic matter release, oil recovery, and lactic acid fermentation in the supernatant under these conditions, failing to support further improvements in the overall resource recovery efficiency.

[0004] In summary, traditional food waste treatment solutions generally suffer from inherent defects such as low resource recovery efficiency, high treatment costs, and insufficient product added value. Furthermore, the research on hydrothermal pretreatment is insufficient, making it difficult to achieve synergistic resource recovery such as efficient oil recovery and high-quality fermentation substrate preparation. This fails to meet the industry's development needs for harmless, high-value, and large-scale treatment of food waste, becoming a key technological bottleneck restricting the upgrading of food waste treatment technology and the development of the resource recovery industry. Summary of the Invention

[0005] The main objective of this application is to propose a food waste resource recovery system, method, electronic device, and storage medium, aiming to solve the problem that traditional food waste treatment solutions are difficult to achieve multi-level resource recovery synergy.

[0006] To achieve the above objectives, a first aspect of this application proposes a food waste resource recovery system, the system comprising: Hot water decomposition and phase separation module; An oil-liquid-solid three-phase separation module is provided, wherein the feed end of the oil-liquid-solid three-phase separation module is connected to the discharge end of the hot water hydrolysis module, and the oil-liquid-solid three-phase separation module is provided with an oil phase outlet, a liquid phase outlet and a solid phase outlet; An oil recovery module, wherein the feed end of the oil recovery module is connected to the oil phase outlet, the oil recovery module includes an oil recovery unit, and the oil recovery unit is provided with an oil product outlet; A liquid-phase biological fermentation module is connected to a liquid outlet. The liquid-phase biological fermentation module includes a primary filamentous fungal fermentation unit and a mycelial fiber separation and recovery unit connected in sequence. The mycelial fiber separation and recovery unit is provided with a mycelial product outlet. A solid-phase step-by-step conversion module is connected to the solid-phase outlet. The solid-phase step-by-step conversion module includes a solid residue lactic acid fermentation unit, a lactic acid product and acidified residue diversion and output unit, and a lactic acid recovery unit connected in sequence. The lactic acid recovery unit is provided with a lactic acid product outlet.

[0007] In some embodiments, the mycelial fiber separation and recovery unit is further provided with a primary fermentation residue outlet, and the liquid-phase bio-fermentation module further includes: A secondary yeast or single-celled fungal fermentation unit, wherein the feed end of the secondary yeast or single-celled fungal fermentation unit is connected to the outlet of the primary fermentation residue; A yeast protein recovery unit is provided, wherein the feed end of the yeast protein recovery unit is connected to the discharge end of the secondary yeast or single-celled fungal fermentation unit, and the yeast protein recovery unit is provided with a yeast protein product outlet.

[0008] In some embodiments, the yeast protein recovery unit is further provided with a secondary fermentation liquid outlet, and the feed end of the solid residue lactic acid fermentation unit is also connected to the primary fermentation liquid outlet and / or the secondary fermentation liquid outlet.

[0009] In some embodiments, the system further includes: The waste liquid reuse pipeline has its inlet connected to the outlet of the primary fermentation waste liquid and / or the outlet of the secondary fermentation waste liquid, and its outlet connected to the feed end of the solid residue lactic acid fermentation unit; the waste liquid reuse pipeline includes a waste liquid storage tank, a regulating tank, a filter, a metering pump, a valve and / or a check valve connected in sequence.

[0010] In some embodiments, the outlet of the secondary fermentation residue is connected to a wastewater treatment interface, and / or the outlet of the residue reuse pipeline is connected to a wastewater treatment interface.

[0011] In some embodiments, the liquid-phase bio-fermentation module further includes: A primary fermentation residue storage or regulation unit is provided, wherein the feed end of the primary fermentation residue storage or regulation unit is connected to the outlet of the primary fermentation residue, and the feed end of the secondary yeast or single-celled fungus fermentation unit is connected to the discharge end of the primary fermentation residue storage or regulation unit.

[0012] In some embodiments, the lactic acid product and acidification residue diversion and output unit is provided with a lactic acid product outlet and an acidification residue outlet, and the feed end of the lactic acid recovery unit is connected to the lactic acid product outlet; The solid-phase step-by-step conversion module also includes: A residue dewatering unit is connected to the acidified residue outlet; A pyrolysis and / or gasification unit, wherein the feed end of the pyrolysis and / or gasification unit is connected to the discharge end of the residue dewatering unit; A biochar-oil-gas grading and recovery unit is provided, wherein the feed end of the biochar-oil-gas grading and recovery unit is connected to the discharge end of the pyrolysis and / or gasification unit, and the biochar-oil-gas grading and recovery unit is provided with a biochar outlet, a biooil outlet and a biogas outlet.

[0013] To achieve the above objectives, a second aspect of this application proposes a method for the resource recovery and treatment of food waste, applied to the food waste resource recovery and treatment system described in the first aspect, the method comprising: The kitchen waste is subjected to hot water hydrolysis phase separation module to obtain hot water hydrolyzed kitchen waste; The oil-liquid-solid three-phase separation module is used to perform oil-liquid-solid three-phase separation treatment on the kitchen waste after hot water hydrolysis. The oil phase is fed into the oil recovery module for oil recovery treatment through the oil phase outlet, the liquid phase is fed into the liquid phase biological fermentation module for primary filamentous fungal fermentation treatment through the liquid phase outlet, and the solid phase is fed into the solid phase step conversion module for lactic acid fermentation treatment through the solid phase outlet.

[0014] To achieve the above objectives, a third aspect of this application provides an electronic device applied to the food waste resource recovery system described in the first aspect. The electronic device includes a memory and a processor. The memory stores a computer program, and the processor executes the computer program to implement the food waste resource recovery method described in the second aspect.

[0015] To achieve the above objectives, a fourth aspect of the present application provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the food waste resource recovery method described in the second aspect.

[0016] To achieve the above objectives, a fifth aspect of the present application provides a computer program product, which includes a computer program that, when executed by a processor, implements the food waste resource recovery method provided in the second aspect above.

[0017] The food waste resource recovery system, method, electronic equipment, computer-readable storage medium, and computer program product proposed in this application embodiment utilize a three-pronged resource recovery pathway—oil, liquid, and solid—after hydrolysis and phase separation. The oil phase recovers grease products, the liquid phase undergoes two-stage fungal fermentation to recover mycelial fibers and yeast proteins, and the solid phase undergoes lactic acid fermentation to recover lactic acid products. The remaining acidified residue is then thermochemically converted to recover carbon, oil, and gas products. Simultaneously, the liquid and solid pathways can be linked through residual liquid reuse. Thus, this application embodiment solves the problem of traditional food waste treatment schemes' difficulty in achieving multi-level resource recovery synergy. Furthermore, compared to traditional food waste treatment schemes, this application embodiment can achieve graded and tiered utilization of all components of food waste, significantly improving the resource recovery efficiency and product added value of organic matter. In addition, the food waste resource recovery system provided in this application embodiment has a clear structure and well-defined interfaces, combining operational flexibility and engineering feasibility, and can be adapted to food waste treatment scenarios of different scales. Attached Figure Description

[0018] Figure 1 A schematic diagram of the overall process connection of the food waste resource utilization system provided in some embodiments of this application; Figure 2A schematic diagram of the liquid-phase biological fermentation branch involved in some embodiments of the food waste resource utilization system provided in this application; Figure 3 A schematic diagram of the solid-phase lactic acid fermentation and product diversion output branch involved in some embodiments of the food waste resource utilization system provided in this application; Figure 4 A schematic diagram of the structure of the acidified residue pyrolysis / gasification and charcoal oil gas graded recovery branch involved in some embodiments of the food waste resource utilization system provided in the embodiments of this application; Figure 5 A schematic diagram of the structure of the liquid-phase fermentation residue reuse pipeline involved in some embodiments of the food waste resource utilization system provided in this application; Figure 6 The flowchart of the method for resource recovery of kitchen waste provided in the embodiments of this application is shown in some embodiments; Figure 7 The electronic device provided in the embodiments of this application is shown in some embodiments as a hardware structure diagram. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0020] It should be noted that although functional modules are divided in the device schematic diagram and a logical order is shown in the flowchart, in some cases, the steps shown or described may be performed in a different order than the module division in the device or the order in the flowchart. The terms "first," "second," etc., in the specification, claims, and the aforementioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing embodiments of this application only and is not intended to limit this application.

[0022] First, a brief explanation of the relevant technical terms involved in the embodiments of this application will be given.

[0023] Oil-liquid-solid three-phase separation: refers to the process of separating the oil phase, liquid phase and solid phase after hot water hydrolysis or hydrothermal treatment of kitchen waste.

[0024] Primary fermentation residue: refers to the liquid phase remaining after primary filamentous fungi fermentation and mycelial product separation.

[0025] Lactic acid product and acidification residue separation output: refers to the connection of the discharge end of the solid residue lactic acid fermentation unit to the lactic acid product and acidification residue separation output unit. The separation output unit is equipped with a lactic acid product outlet and an acidification residue outlet, so that the lactic acid product enters the recovery or utilization unit and the acidification residue enters the dehydration and thermochemical conversion unit.

[0026] Pyrolysis / gasification: refers to the treatment method in which acidified residue is dehydrated and then enters the thermochemical conversion unit.

[0027] Biogas: refers to the gaseous product generated from the pyrolysis and / or gasification of acidification residue, which may contain one or more of carbon monoxide (CO), carbon dioxide (CO2), methane (CH4), and hydrogen (H2). In the product evaluation system involved in the embodiments of this application, methane and hydrogen are used as target effective components, and their volume fractions are determined separately. The sum of their volume fractions can be used to characterize the content of the target effective component.

[0028] Rapid separation and recovery of high-purity fungal cell recoveries: This refers to the separation and recovery of the corresponding fungal cells within 2 hours after the primary filamentous fungal fermentation or secondary yeast / single-celled fungal fermentation reaches a preset endpoint. The process involves screening, filtration, sedimentation, centrifugation, or a combination thereof, under conditions where the processing capacity of the corresponding separation equipment matches the material quantity. Washing, re-filtration, or re-centrifugation can also be used to reduce the entrainment of non-fungal solids. The purity of the obtained fungal cell recoveries can be characterized by the ratio of the target fungal cell dry weight to the recovered solid dry weight, the non-fungal solids entrainment rate, ash content, or a combination thereof. When the purity threshold confirmed in the embodiments of this application is reached, it is considered a high-purity fungal cell recovery. It should be understood that the 2-hour timeframe and purity indicators are used for evaluating the project implementation effect. High purity means that the ratio of the target fungal cell dry weight to the recovered solid dry weight after separation is higher than the ratio of the target fungal cell dry weight to the total solid dry weight of the fermented material before separation.

[0029] COD, TOC, TS, and VS refer to chemical oxygen demand, total organic carbon, total solids, and volatile solids, respectively.

[0030] Next, the overall concept of the embodiments of this application will be briefly described.

[0031] Food waste has a high moisture content and contains significant amounts of grease, soluble organic matter, and solid organic residue. Conventional treatment methods include oil-water separation, anaerobic digestion, aerobic composting, feed conversion, incineration, pyrolysis, or gasification. Existing research shows that hydrothermal pretreatment of food waste combined with liquid-solid separation can improve the release of organic matter and grease recovery from the supernatant, and can provide fermentable substrates for subsequent lactic acid fermentation.

[0032] Existing hot water hydrolysis phase separation technologies typically focus on oil extraction, volume reduction, anaerobic digestion, or conventional resource recovery, with incomplete subsequent liquid and solid phase pathways. Furthermore, existing liquid-phase fungal or yeast fermentation technologies mostly disclose single-stage fermentation or co-production of ethanol, lacking a system interface for "primary filamentous fungal fermentation—mycelial separation—primary residual liquid directly entering secondary yeast or single-celled fungal fermentation—yeast protein recovery." Moreover, existing food waste lactic acid fermentation technologies usually end with lactic acid production, lacking a system structure that uses the solid residue obtained from hot water hydrolysis three-phase separation as a specific lactic acid fermentation feedstock and establishes separate subsequent utilization pathways for lactic acid products and acidified residues. Furthermore, existing fermentation residue pyrolysis or gasification technologies typically do not specify the source of acidified residue and do not establish a continuous logistics relationship of "hot water hydrolysis solid residue lactic acid fermentation—acidified residue dehydration—pyrolysis or gasification—carbon, oil, and gas staged recovery." Finally, existing whole-component resource utilization systems mostly aim at full utilization or multiple products, lacking a configuration that separates three phases into three outlets, connecting the liquid phase two-stage fermentation branch and the solid phase lactic acid fermentation-acidification residue thermochemical conversion branch, and forming cross-branch material linkage through the reuse of fermentation residue.

[0033] To address the aforementioned issues, this application proposes a food waste resource recovery system, method, electronic device, computer-readable storage medium, and computer program product. The aim is to allow the oil, liquid, and solid phases formed after hot water hydrolysis of food waste to enter suitable resource recovery branches, and to achieve graded recycling of products such as grease, mycelial fiber, yeast protein, lactic acid, biochar, bio-oil, and biogas through clearly defined unit connections, product outlets, and optional reuse pipelines.

[0034] In this embodiment, hot water hydrolysis three-phase separation is used as the core phase separation node, splitting kitchen waste into three independent and coordinated resource recovery branches: oil phase, liquid phase, and solid phase. The oil phase directly recovers crude oil, the liquid phase achieves the tiered high-value utilization of soluble organic matter through a two-stage cascade process of "primary filamentous fungal fermentation - mycelium recovery - secondary yeast fermentation - yeast protein recovery", and the solid phase achieves the reduction and energy conversion of solid residue through "lactic acid fermentation - product diversion - thermochemical conversion of acidified residue". At the same time, a switchable residual liquid reuse pipeline is set up to supplement the residual liquid of liquid phase fermentation to the solid phase lactic acid fermentation unit, forming a cross-branch material circulation, and finally realizing the graded recovery of multiple products such as oil, mycelium fiber, yeast protein, lactic acid, biochar, bio-oil, and biogas.

[0035] Next, based on the overall concept of the above embodiments of this application, specific embodiments of the food waste resource recovery system, method, electronic device, computer-readable storage medium and computer program product proposed in the embodiments of this application are presented, and each specific embodiment of the food waste resource recovery system proposed in the embodiments of this application is described in detail first.

[0036] It should be noted that in all specific embodiments of this application, when processing data related to user identity or characteristics, such as user information, user behavior data, user historical data, and user location information, user permission or consent is obtained first. Furthermore, the collection, use, and processing of this data comply with relevant laws, regulations, and standards. In addition, when embodiments of this application require access to sensitive personal information of users, separate permission or consent from the user is obtained through pop-ups or redirection to confirmation pages. Only after obtaining the user's separate permission or consent is the necessary user-related data required for the proper functioning of these embodiments acquired.

[0037] It should be noted that the food waste resource utilization system provided in this application relates to the fields of food waste, organic solid waste resource utilization, and biorefining technology. The food waste resource utilization system provided in this application can be applied to a terminal or a server, while the food waste resource utilization method provided in this application can be software running on either the terminal or the server. In some embodiments, the terminal can be a device integrating the food waste resource utilization system, or it can be an electronic device such as a smartphone, tablet, laptop, or desktop computer that controls the device integrating the food waste resource utilization system. The server can be the backend server terminal device of the terminal, which can be configured as an independent physical server, a server cluster or distributed system composed of multiple physical servers, or a cloud server providing basic cloud computing services such as cloud services, cloud databases, cloud computing, cloud functions, cloud storage, network services, cloud communication, middleware services, domain name services, security services, content delivery networks (CDN), and big data and artificial intelligence platforms. The software can be an application implementing the food waste resource utilization method, a computer program, and a storage medium carrying the computer program. It should be understood that, based on different design needs of practical applications, the terminals, servers and software involved in the embodiments of this application may be used in different feasible embodiments, and of course, other forms not listed here may also be used. The food waste resource utilization system provided in the embodiments of this application does not specifically limit this.

[0038] Furthermore, this application can also be used in numerous general-purpose or special-purpose computer system environments or configurations. Examples include: personal computers, server computers, handheld or portable devices, tablet devices, multiprocessor systems, microprocessor-based systems, set-top boxes, programmable consumer electronics devices, personal computers (PCs), minicomputers, mainframe computers, and distributed computing environments including any of the above systems or devices. This application can be described in the general context of computer-executable instructions executed by a computer, such as program modules. Generally, program modules include routines, programs, objects, components, data structures, etc., that perform specific tasks or implement specific abstract data types. This application can also be practiced in distributed computing environments where tasks are performed by remote processing devices connected via communication networks. In distributed computing environments, program modules can reside in local and remote computer storage media, including storage devices.

[0039] For ease of understanding and explanation, the following text will use a food waste resource recovery system (hereinafter referred to as the "system") as an example to describe the various specific embodiments of this application in detail. Any entity applying the food waste resource recovery system provided in the embodiments of this application can refer to the implementation process of the food waste resource recovery system described below.

[0040] In this embodiment of the application, the food waste resource recovery system may include: Hot water decomposition and phase separation module; An oil-liquid-solid three-phase separation module is provided, wherein the feed end of the oil-liquid-solid three-phase separation module is connected to the discharge end of the hot water hydrolysis module, and the oil-liquid-solid three-phase separation module is provided with an oil phase outlet, a liquid phase outlet and a solid phase outlet; An oil recovery module, wherein the feed end of the oil recovery module is connected to the oil phase outlet, the oil recovery module includes an oil recovery unit, and the oil recovery unit is provided with an oil product outlet; A liquid-phase biological fermentation module is connected to a liquid outlet. The liquid-phase biological fermentation module includes a primary filamentous fungal fermentation unit and a mycelial fiber separation and recovery unit connected in sequence. The mycelial fiber separation and recovery unit is provided with a mycelial product outlet. A solid-phase step-by-step conversion module is connected to the solid-phase outlet. The solid-phase step-by-step conversion module includes a solid residue lactic acid fermentation unit, a lactic acid product and acidified residue diversion and output unit, and a lactic acid recovery unit connected in sequence. The lactic acid recovery unit is provided with a lactic acid product outlet.

[0041] In this embodiment, the discharge end of the hot water hydrolysis phase separation module is connected to the feed end of the oil-liquid-solid three-phase separation module, which has an oil phase outlet, a liquid phase outlet, and a solid phase outlet. Thus, the system can use the hot water hydrolysis phase separation module and the oil-liquid-solid three-phase separation module as the core of the system's front-end pretreatment. The hot water hydrolysis phase separation module breaks down the cell walls of organic matter through a hydrothermal reaction, promoting the release of oils and the dissolution of soluble organic matter; and the oil-liquid-solid three-phase separation module separates the homogeneous slurry into three independent streams, providing a foundation for subsequent fractional resource recovery. Furthermore, the feed end of the oil recovery module is connected to the oil phase outlet and includes an oil recovery unit and an oil product outlet, which can be used to purify and refine the separated crude oil phase, recovering a crude oil product that can be utilized for resource recovery. Furthermore, the liquid-phase bio-fermentation module is connected to the liquid-phase outlet and includes a first-stage filamentous fungal fermentation unit and a mycelial fiber separation and recovery unit connected in sequence. The mycelial fiber separation and recovery unit has a mycelial product outlet. This module can use the hot hydrolysis liquid phase as a substrate to convert soluble organic matter into mycelial fiber biomass through filamentous fungal fermentation, achieving the first-stage high-value conversion of liquid-phase organic matter. Finally, the solid-phase cascade conversion module is connected to the solid-phase outlet and includes a solid residue lactic acid fermentation unit, a lactic acid product and acidified residue diversion and output unit, and a lactic acid recovery unit connected in sequence. The lactic acid recovery unit has a lactic acid product outlet. This module uses the hot hydrolysis solid residue as a substrate for lactic acid fermentation and recovers the lactic acid product and acidified residue separately through solid-liquid diversion, thereby achieving the extraction and high-value conversion of fermentable organic matter in the solid residue.

[0042] like Figure 1 As shown, in some embodiments, the food waste resource utilization system may include a pretreatment and slurry preparation module 1, a hot water hydrolysis phase separation module 2, an oil-liquid-solid three-phase separation module 3, an oil recovery unit 4, a liquid phase biological fermentation branch, a solid phase cascade conversion branch, a residue thermochemical conversion branch, and a carbon-oil-gas graded recovery unit 14, etc.

[0043] The oil-liquid-solid three-phase separation module 3 is equipped with an oil phase outlet 3a, a liquid phase outlet 3b, and a solid phase outlet 3c. The oil phase outlet 3a is connected to the oil recovery unit 4; the liquid phase outlet 3b is connected to the liquid phase bio-fermentation branch; and the solid phase outlet 3c is connected to the solid phase cascade conversion branch.

[0044] The liquid-phase bio-fermentation circuit includes a primary filamentous fungal fermentation unit 5, a mycelial fiber separation and recovery unit 6, a primary fermentation residue storage or regulation unit 16, a secondary yeast or single-celled fungal fermentation unit 7, and a yeast protein recovery unit 8. The mycelial fiber separation and recovery unit 6 has a mycelial product outlet 6a and a primary fermentation residue outlet 6b, which is connected to the secondary yeast or single-celled fungal fermentation unit 7.

[0045] The solid-phase cascade conversion branch includes a solid residue lactic acid fermentation unit 9, a lactic acid product and acidified residue diversion and output unit 10, a lactic acid recovery unit 11 (or lactic acid recovery and utilization unit, lactic acid utilization unit, etc.), a residue dewatering unit 12, a pyrolysis and / or gasification unit 13, and a carbon-oil-gas classification and recovery unit 14. The feed end of the solid residue lactic acid fermentation unit 9 is connected to the solid phase outlet 3c of the oil-liquid-solid three-phase separation module 3, and its discharge end is connected to the lactic acid product and acidified residue diversion and output unit 10; the lactic acid product outlet 10a of the lactic acid product and acidified residue diversion and output unit 10 is connected to the lactic acid recovery unit 11, and the acidified residue outlet 10b is connected to the residue dewatering unit 12; the residue dewatering unit 12 is connected to the pyrolysis and / or gasification unit 13, and the pyrolysis and / or gasification unit 13 is connected to the carbon-oil-gas classification and recovery unit 14.

[0046] In some embodiments, the food waste resource recovery system further includes a pretreatment and slurry preparation module, the discharge end of which is connected to the feed end of the hot water hydrolysis phase separation module. Food waste can first undergo pretreatment and slurry preparation in the pretreatment and slurry preparation module before being fed into the hot water hydrolysis phase separation module. For example, the food waste enters the pretreatment and slurry preparation module for sorting, impurity removal, and crushing, and is then mixed with water to form a slurry with a mass concentration of 10% TS before being fed into the hot water hydrolysis phase separation module.

[0047] In some embodiments, the hot water hydrolysis phase separation module includes food waste receiving, sorting and impurity removal, crushing, slurry preparation, hot water hydrolysis or warm / hydrothermal treatment, three-phase separation, and phase temporary storage. Furthermore, the food waste slurry with 10% TS is hydrothermally treated at 80-140°C for 30 min, followed by centrifugation at 4600 rpm for 5 min and removal of surface grease. At 140°C, the proportion of organic matter in the supernatant to total tCOD increased from 39.6% in the control to 63.8%, the highest tCOD in the supernatant was 103.4 g COD / L, the highest hydrolysis rate was 77.3%, and the grease recovery rate was 36.6%.

[0048] In some embodiments, the hot water hydrolysis phase separation module can be a hot water hydrolysis reactor, which can keep the slurry of kitchen waste (such as 10% TS food waste slurry) at 80-140°C for 30 minutes, and then centrifuge at 4600 rpm for 5 minutes to remove surface grease.

[0049] In some embodiments, the oil-liquid-solid three-phase separation module can use a horizontal centrifuge at a speed of 4600 rpm to centrifuge the slurry after the reaction in the hot water hydrolysis phase separation module for 5 minutes, and achieve three-phase separation by skimming off the oil and discharging the slurry in layers; the upper oil phase is output through the oil phase outlet, the middle liquid phase is output through the liquid phase outlet, and the lower solid phase is output through the solid phase outlet.

[0050] In some embodiments, the oil recovery unit may employ a heating sedimentation + filtration process, heating the oil phase to 60°C and holding it at that temperature for 2 hours to remove bottom moisture and impurities, then filtering it through a bag filter to remove suspended solids, finally obtaining crude oil product, which is then collected and stored through the oil product outlet.

[0051] In some embodiments, the primary filamentous fungal fermentation unit can employ a mechanically stirred fermenter, inoculated with a suspension of filamentous fungal spores, and fermented under conditions of 28-32°C, an aeration rate of 1:0.8 vvm, and a natural pH. After fermentation, the fermentation broth is sent to the mycelial fiber separation and recovery unit. The mycelial fiber separation and recovery unit can separate the mycelium using one or more combinations of sieving, filtration, sedimentation, or centrifugation. The separation equipment is configured with rated processing capacity based on the amount of material per batch, ensuring that the separation time for a single batch does not exceed 2 hours. The separated mycelial fibers are washed, re-filtered, and collected through the mycelial product outlet to obtain a high-purity mycelial fiber product.

[0052] In some embodiments, the solid residue lactic acid fermentation unit can be a closed fermenter. Water is added to the hot hydrolysate solid phase to adjust the initial substrate concentration to 50 g COD / L, lactic acid bacteria are inoculated, and fermentation is carried out at 35°C and pH 4.0±0.1. After fermentation, the effluent is sent to a lactic acid product and acidified residue separation unit, where solid-liquid separation is achieved by pressure filtration or centrifugation. The liquid phase is crude lactic acid product, which is sent to the lactic acid recovery unit through the lactic acid product outlet. After concentration and purification, the lactic acid product is obtained and collected through the lactic acid product outlet.

[0053] In some embodiments, the system may be equipped with oil outlets, mycelial fiber outlets, yeast protein outlets, lactic acid product outlets, biochar outlets, bio-oil outlets, and biogas outlets. Each outlet may be equipped with a sampling port, flow rate or mass metering interface, and the three-phase separation yield, mycelial dry weight, yeast biomass and protein ratio, lactic acid concentration, lactic acid product output, moisture content of acidified residue, distribution of pyrolysis or gasification products, and material composition before and after residual liquid reuse are used as operational evaluation indicators. It should be understood that the above indicators are used to describe the detection and evaluation methods of the system, but do not constitute a limitation on the fixed yield or concentration of each product.

[0054] In some embodiments, the system may also record the separation method, separation start and end time, separation recovery rate, and the proportion of target cell dry weight to recovered solid dry weight, non-cell solid entrainment rate and / or ash content of primary mycelial samples and secondary yeast / single-cell fungal samples; record the total biogas yield and the volume fractions of CO, CO2, CH4 and H2, and use the sum of the volume fractions of CH4 and H2 as the content of the target effective component.

[0055] For example, the connection method of the food waste resource utilization system can be as follows: the pretreatment and slurry preparation unit is connected to the hot water hydrolysis unit, the hot water hydrolysis unit is connected to the three-phase separation unit; the oil phase outlet of the three-phase separation unit is connected to the oil recovery unit, the liquid phase outlet is connected to the liquid phase biological fermentation branch, and the solid phase outlet is connected to the solid phase cascade conversion branch.

[0056] Based on this, the operation process of the food waste resource utilization system can be as follows: after pretreatment, slurry preparation and hot hydrolysis, the food waste enters the three-phase separation unit. The oil phase enters the oil recovery unit, the liquid phase enters the primary filamentous fungal fermentation and the secondary yeast fermentation unit, and the solid phase enters the lactic acid fermentation unit. After the lactic acid products and acidified residues are separated and output, the lactic acid products enter the recycling or utilization unit, and the acidified residues enter the dehydration and pyrolysis or gasification unit.

[0057] A 10% TS slurry was treated at 80-140℃ for 30 min, followed by centrifugation at 4600 rpm for 5 min and oil skimming, serving as the operating window for hydrolysis and phase separation. This study reported an oil recovery rate of 36.6% and a maximum tCOD of 103.4 gCOD / L in the supernatant at 140℃. During system operation, the mass or volume of the oil, liquid, and solid phases was measured separately at the outlets, and the liquid phase COD / TOC and solid phase TS / VS were measured to establish a three-phase material balance.

[0058] In this embodiment, the food waste resource recovery system uses hot hydrolysis three-phase separation as the core phase separation node, dividing food waste into three independent and coordinated resource recovery branches: oil phase, liquid phase, and solid phase. The oil phase directly recovers crude grease; the liquid phase achieves high-value utilization of soluble organic matter through a two-stage cascade process of "primary filamentous fungal fermentation—mycelium recovery—secondary yeast fermentation—yeast protein recovery"; and the solid phase achieves slag reduction and energy conversion through "lactic acid fermentation—product diversion—thermochemical conversion of acidified residue". Simultaneously, a switchable residual liquid reuse pipeline is provided to replenish the liquid phase fermentation residue to the solid phase lactic acid fermentation unit, forming a cross-branch material circulation, ultimately achieving graded recovery of multiple products such as grease, mycelial fiber, yeast protein, lactic acid, biochar, bio-oil, and biogas. In other words, compared to traditional food waste treatment solutions, the food waste resource recovery system provided in this embodiment facilitates the separate introduction of the oil, liquid, and solid phases after hot hydrolysis into suitable branches, enabling graded resource recovery. Furthermore, the food waste resource recovery system provided in this application, which utilizes all components of food waste in a graded and tiered manner, can significantly improve the resource recovery efficiency of organic matter and the added value of products. Moreover, the food waste resource recovery system provided in this application has a clear structure and well-defined interfaces, combining operational flexibility with engineering feasibility, and can be adapted to food waste treatment scenarios of different scales.

[0059] In some embodiments, the mycelial fiber separation and recovery unit is further provided with a primary fermentation residue outlet, and the liquid-phase bio-fermentation module further includes: A secondary yeast or single-celled fungal fermentation unit, wherein the feed end of the secondary yeast or single-celled fungal fermentation unit is connected to the outlet of the primary fermentation residue; A yeast protein recovery unit is provided, wherein the feed end of the yeast protein recovery unit is connected to the discharge end of the secondary yeast or single-celled fungal fermentation unit, and the yeast protein recovery unit is provided with a yeast protein product outlet.

[0060] In this embodiment, the mycelial fiber separation and recovery unit has a primary fermentation broth outlet, which is subsequently connected to a secondary yeast or single-celled fungal fermentation unit and a yeast protein recovery unit. The yeast protein recovery unit has a yeast protein product outlet. Based on this structure, the system can utilize the remaining fermentable substrate in the primary fermentation broth to achieve a second-level transformation of organic matter through yeast or single-celled fungal fermentation, further improving the utilization rate of liquid-phase carbon sources and producing high-value-added yeast protein products. For example, after the mycelium is separated by the mycelial fiber separation and recovery unit, the remaining primary fermentation broth is discharged into the secondary yeast or single-celled fungal fermentation unit through the primary fermentation broth outlet.

[0061] In some embodiments, the liquid-phase bio-fermentation module further includes: A primary fermentation residue storage or regulation unit is provided, wherein the feed end of the primary fermentation residue storage or regulation unit is connected to the outlet of the primary fermentation residue, and the feed end of the secondary yeast or single-celled fungus fermentation unit is connected to the discharge end of the primary fermentation residue storage or regulation unit.

[0062] In this embodiment, the primary fermentation broth outlet of the mycelial fiber separation and recovery unit can also be connected to a primary fermentation broth temporary storage or adjustment unit. This unit is then sequentially connected to a secondary yeast or single-celled fungal fermentation unit and a yeast protein recovery unit, with the latter having a yeast protein product outlet. Thus, after the mycelium is separated by the mycelial fiber separation and recovery unit, the remaining primary fermentation broth can be discharged through the primary fermentation broth outlet into the primary fermentation broth temporary storage or adjustment unit. After adjusting the pH by adding acid / alkali and supplementing with nitrogen and phosphorus nutrients, it is then pumped into the secondary yeast or single-celled fungal fermentation unit.

[0063] In some embodiments, the yeast protein recovery unit is further provided with a secondary fermentation liquid outlet, and the feed end of the solid residue lactic acid fermentation unit is also connected to the primary fermentation liquid outlet and / or the secondary fermentation liquid outlet.

[0064] In this embodiment, the yeast protein recovery unit also has a secondary fermentation liquid outlet, which can be connected to the feed end of the solid residue lactic acid fermentation unit. Simultaneously, the feed end of the solid residue lactic acid fermentation unit can also be connected to the primary fermentation liquid outlet. Alternatively, the feed end of the solid residue lactic acid fermentation unit can be connected only to the primary fermentation liquid outlet, or it can be connected only to the secondary fermentation liquid outlet.

[0065] In some embodiments, the secondary fermentation liquid outlet of the yeast protein recovery unit can also be used to discharge the remaining waste liquid after fermentation.

[0066] like Figure 2 As shown, in some embodiments, the liquid-phase bio-fermentation module includes a primary filamentous fungal fermentation unit 5, a mycelial fiber separation and recovery unit 6, a primary fermentation residue storage or regulation unit 16, a secondary yeast or single-celled fungal fermentation unit 7, and a yeast protein recovery unit 8. This primary filamentous fungal fermentation unit 5, mycelial fiber separation and recovery unit 6, primary fermentation residue storage or regulation unit 16, secondary yeast or single-celled fungal fermentation unit 7, and yeast protein recovery unit 8 can constitute the liquid-phase bio-fermentation branch in a food waste resource recovery system.

[0067] After the primary filamentous fungal fermentation reaches the preset endpoint, the mycelium and mycelium can be separated and recovered by screening, filtration, sedimentation, centrifugation or a combination thereof; after the secondary yeast or single-celled fungal fermentation reaches the preset endpoint, the yeast or single-celled fungal mycelium can be separated and recovered by filtration, self-flocculation sedimentation, centrifugation or a combination thereof.

[0068] Furthermore, to meet the process requirement of completing separation and recovery within 2 hours, the rated processing capacity of the separation equipment is configured based on the amount of fermentation material per batch, ensuring that the designed processing time from the entry of a single batch of material into the separation equipment to the completion of cell unloading does not exceed 2 hours; parallel filtration or centrifugation equipment is installed if necessary. After separation, washing, re-filtration, or re-centrifugation can be used to reduce the entrainment of non-microbial solids, forming a fungal cell-enriched recovery. The purity of the recovery is characterized by the ratio of the target cell dry weight to the recovered solid dry weight, and can be determined in conjunction with the non-microbial solids entrainment rate and ash content.

[0069] For example, in the liquid phase biological fermentation module of the food waste resource utilization system, the connection method of the two-stage liquid phase fermentation branch can be as follows: the liquid phase outlet is connected to the primary filamentous fungal fermentation unit, the primary fermentation liquid is connected to the mycelium fiber separation and recovery unit, the primary fermentation residue outlet of the mycelium fiber separation and recovery unit is connected to the secondary yeast or single-cell fungal fermentation unit, and the secondary fermentation unit is connected to the yeast protein recovery unit.

[0070] Based on this, the operation process of the liquid phase bio-fermentation module can be as follows: the liquid phase is fermented by primary filamentous fungi to form mycelial fibers, mycelial balls or mycelial clusters, and the mycelial products are separated and recovered; the residual liquid from the primary fermentation is temporarily stored or adjusted and then enters the secondary yeast or single-cell fungi fermentation, and then the yeast protein or single-cell protein is recovered.

[0071] Furthermore, the operational evaluation method for the liquid-phase bio-fermentation module can be as follows: COD, TOC, soluble sugars, and nitrogenous components are measured before and after primary fermentation, and the dry weight of the mycelial cell recovery product is recorded. After the primary fermentation residue enters the secondary fermentation stage, the dry weight of the yeast or single-celled fungal cell recovery product, protein ratio, fermentation cycle, and byproduct composition are recorded. These measurements are used to evaluate material transfer and product formation in the two-stage pathways, and a fixed conversion rate is not a necessary condition for system connection.

[0072] Furthermore, the system can employ the following rapid separation and purity control methods: After primary fermentation, mycelia and mycelia are separated by sieving, filtration, sedimentation, centrifugation, or a combination thereof. After secondary fermentation, yeast or single-celled fungal cells are separated by filtration, self-flocculation sedimentation, centrifugation, or a combination thereof. The separation equipment is configured based on the amount of fermentation material per batch, ensuring that the designed processing time from material entry to cell discharge does not exceed 2 hours. When the processing capacity of a single unit is insufficient, parallel equipment or continuous batch feeding can be used. After washing, re-filtration, or re-centrifugation, the purity of the recovered mycelia is primarily determined by the ratio of the target mycelia dry weight to the total dry weight of the recovered solids, combined with the non-mycelia solids entrainment rate or ash content. When this ratio after separation is higher than the ratio of the target mycelia dry weight to the total dry weight of the fermentation material before separation, it indicates that the target mycelia have been enriched.

[0073] In this embodiment, the food waste resource recovery system facilitates the connection between the primary fermentation residue outlet and the secondary yeast or single-celled fungal fermentation unit in the liquid phase branch. Furthermore, the system is equipped with a mycelial fiber separation and recovery unit and a yeast protein recovery unit, allowing for the acquisition of corresponding fungal cell recoveries through methods such as sieving, filtration, sedimentation, or centrifugation. By configuring the rated processing capacity of the separation equipment according to the batch material quantity and employing parallel filtration, parallel centrifugation, washing, re-filtration, or re-centrifugation as needed, the designed processing time for single-batch fungal cell separation and recovery can be controlled within 2 hours, reducing the entrainment of non-fungal solids and facilitating the acquisition of high-purity fungal cell recoveries with the target fungal cells as the main solid component.

[0074] In some embodiments, the lactic acid product and acidification residue diversion and output unit is provided with a lactic acid product outlet and an acidification residue outlet, and the feed end of the lactic acid recovery unit is connected to the lactic acid product outlet; The solid-phase step-by-step conversion module also includes: A residue dewatering unit is connected to the acidified residue outlet; A pyrolysis and / or gasification unit, wherein the feed end of the pyrolysis and / or gasification unit is connected to the discharge end of the residue dewatering unit; A biochar-oil-gas grading and recovery unit is provided, wherein the feed end of the biochar-oil-gas grading and recovery unit is connected to the discharge end of the pyrolysis and / or gasification unit, and the biochar-oil-gas grading and recovery unit is provided with a biochar outlet, a biooil outlet and a biogas outlet.

[0075] In this embodiment, the lactic acid product and acidified residue separation and output unit has a lactic acid product outlet and an acidified residue outlet. The lactic acid product outlet is connected to the feed end of the lactic acid recovery unit. The acidified residue outlet is subsequently connected to a residue dehydration unit, a pyrolysis and / or gasification unit, and a biogas-oil fractionation and recovery unit. The system allows the acidified residue output from the lactic acid product and acidified residue separation and output unit to undergo thermochemical conversion after its moisture content is reduced by the residue dehydration unit. The conversion products then enter the pyrolysis and / or gasification unit for further thermochemical conversion. The biogas-oil fractionation and recovery unit outputs the corresponding products through biochar, biooil, and biogas outlets, respectively. The biogas components can be detected by gas chromatography or other methods, and the sum of the volume fractions of methane and hydrogen can be used as an effective component evaluation index.

[0076] like Figure 3 and Figure 4 As shown, in some embodiments, the solid-phase stepwise conversion module includes a solid residue lactic acid fermentation unit 9, a lactic acid product and acidified residue diversion and output unit 10, a lactic acid recovery or utilization unit 11, an acidified residue dehydration unit 12, a pyrolysis and / or gasification unit 13, and a carbon-oil-gas staged recovery unit 14. The hydrothermal supernatant was treated at 35°C, pH 4.0±0.1, an initial substrate concentration of 50 g COD / L, and an 8-day fermentation cycle. The lactic acid concentration in the 120°C hydrothermal group was 12.4 g / L.

[0077] The discharge end of the solid residue lactic acid fermentation unit 9 is connected to the lactic acid product and acidified residue diversion output unit 10. The lactic acid product and acidified residue diversion output unit 10 is provided with a lactic acid product outlet 10a and an acidified residue outlet 10b. The acidified residue outlet 10b is connected to the residue dewatering unit 12, the pyrolysis and / or gasification unit 13 and the carbon oil gas classification and recovery unit 14.

[0078] The acidified residue is pyrolyzed and / or gasified to produce biochar, biooil, and biogas. The biogas may contain one or more of CO, CO2, CH4, and H2. In the product evaluation system of the food waste resource utilization system provided in the embodiments of this application, CH4 and H2 can be used as target effective components, their volume fractions can be detected separately, and the sum of their volume fractions can be used to characterize the content of the target effective components.

[0079] For example, in the solid-phase cascade conversion module of the food waste resource utilization system, the connection method of the solid-phase lactic acid fermentation and acidified residue thermochemical conversion branch can be as follows: the solid phase outlet of the three-phase separation unit is connected to the solid residue lactic acid fermentation unit; the discharge end of the solid residue lactic acid fermentation unit is connected to the lactic acid product and acidified residue diversion output unit; the lactic acid product outlet of the diversion output unit is connected to the lactic acid recovery or utilization unit, and the acidified residue outlet is connected to the residue dewatering unit; the residue dewatering unit is connected to the pyrolysis and / or gasification unit and the carbon oil gas classification and recovery unit.

[0080] Based on this, the solid-phase cascade conversion module can operate as follows: the solid residue from hot hydrolysis enters the lactic acid fermentation unit, the lactic acid fermentation effluent is diverted and output, and the lactic acid products enter the lactic acid recovery or utilization unit; the acidified residue is dehydrated and then enters the pyrolysis and / or gasification unit, where biochar, biooil and biogas are subsequently recovered in stages.

[0081] The temperature, pH, and cycle of solid residue lactic acid fermentation can refer to the conditions of 35℃, pH 4.0±0.1, and 8 days used in the lactic acid fermentation of hydrothermal products from food waste, and be adjusted according to the solid content and fermentable components of the solid residue. Lactic acid concentration and output are measured at the lactic acid product outlet, and moisture content, total sulfur dioxide (TS), total sulfur dioxide (VS), and ash content are measured at the acidified residue outlet. Temperature, atmosphere, and residence time are recorded in the pyrolysis and / or gasification unit, and biochar, biooil, and biogas are metered separately in the biochar, biooil, and biogas staged recovery unit.

[0082] Furthermore, the biogas evaluation method for the liquid-phase biofermentation module can be as follows: a sampling port is set between the gas purifier and the gas collector, and CO, CO2, CH4, and H2 are detected using gas chromatography, infrared gas analysis, or other applicable methods. CH4 and H2 are used as target effective components, and their volume fractions are recorded separately. The sum of their volume fractions characterizes the content of the target effective components. Simultaneously, the total biogas yield is recorded, and the lower heating value is determined if necessary. It should be understood that because the composition of the acidified residue and thermochemical conditions affect the gas composition, the food waste resource recovery system provided in this application does not specifically limit the fixed content of each gas component.

[0083] In this embodiment, the food waste resource recovery system uses a lactic acid product and acidified residue separation output unit to structurally differentiate the different destinations of materials after solid-phase lactic acid fermentation, allowing the acidified residue to continue into the dehydration and thermochemical conversion branch. Furthermore, the system connects the residue dehydration unit and the pyrolysis / gasification unit via the acidified residue outlet, facilitating subsequent graded recovery of charcoal, oil, and gas. In addition, the system also facilitates the graded collection and component evaluation of biogas obtained from the thermochemical conversion of acidified residue, using methane and hydrogen as target effective components, providing a product interface for the subsequent energy utilization of biogas and the evaluation of project results.

[0084] In some embodiments, the food waste recycling system may further include: The waste liquid reuse pipeline has its inlet connected to the outlet of the primary fermentation waste liquid and / or the outlet of the secondary fermentation waste liquid, and its outlet connected to the feed end of the solid residue lactic acid fermentation unit; the waste liquid reuse pipeline includes a waste liquid storage tank, a regulating tank, a filter, a metering pump, a valve and / or a check valve connected in sequence.

[0085] In this embodiment, the inlet of the waste liquid reuse pipeline is connected to the outlet of the primary fermentation waste liquid and / or the outlet of the secondary fermentation waste liquid, and the outlet is connected to the feed end of the solid residue lactic acid fermentation unit. The pipeline includes a waste liquid storage tank, a regulating tank, a filter, a metering pump, valves, and / or a check valve. In this way, the microfiber can achieve material linkage between the liquid phase branch and the solid phase branch based on this waste liquid reuse pipeline, supplementing the remaining carbon source and nutrients in the fermentation waste liquid to the solid residue lactic acid fermentation unit, thereby improving lactic acid fermentation efficiency and reducing waste liquid discharge. For example, the waste liquid reuse pipeline connects the waste liquid storage tank, filter, regulating tank, metering pump, valves, and check valve in series. The primary fermentation waste liquid and / or secondary fermentation waste liquid are first discharged into the waste liquid storage tank for temporary storage, and after the suspended solids are removed by the filter, they enter the regulating tank. The pH, COD, solid content, and nitrogen content are monitored online, and the reuse ratio is adjusted according to the substrate requirements of the solid residue lactic acid fermentation. The metering pump then quantitatively delivers the waste liquid to the solid residue lactic acid fermentation unit.

[0086] like Figure 5As shown, the primary or secondary fermentation broth can enter the solid residue lactic acid fermentation unit through a broth reuse pipeline; this broth reuse pipeline is retained as an optional subordinate structure of the food waste resource utilization system. It should be noted that when the food waste fermentation broth has a tCOD of approximately 98.4 g / L, a sCOD of approximately 61.4 g / L, and a TN of approximately 948.8 mg N / L, with approximately 78.9% of the sCOD being lactic acid and 3.9% being acetic acid, it indirectly indicates that the food waste fermentation broth can contain usable organic carbon and nutrients. The food waste resource utilization system provided in this application does not limit the component content of the primary and / or secondary fermentation broths.

[0087] In some embodiments, the outlet of the secondary fermentation residue is connected to a wastewater treatment interface, and / or the outlet of the residue reuse pipeline is connected to a wastewater treatment interface.

[0088] In this embodiment, the outlet of the secondary fermentation residue can be directly connected to the wastewater treatment interface, or the outlet of the secondary fermentation residue can be connected to the inlet of the residue reuse pipeline, and the outlet of the residue reuse pipeline can be connected to the wastewater treatment interface, or both the outlet of the secondary fermentation residue and the outlet of the residue reuse pipeline can be connected to the wastewater treatment interface.

[0089] In some embodiments, a bypass branch can also be provided on the residual liquid reuse pipeline, which can be connected to the wastewater treatment interface. When the water quality of the primary fermentation residual liquid and / or secondary fermentation residual liquid exceeds the process acceptance range, the system can close the reuse valve and open the bypass to transport the residual liquid to the wastewater treatment interface.

[0090] For example, in the food waste resource utilization system, the connection method of the residual liquid reuse pipeline can be: the outlet of the primary fermentation residual liquid or the outlet of the secondary fermentation residual liquid is connected to the solid residue lactic acid fermentation unit through the residual liquid reuse pipeline. The reuse pipeline includes one or more of the following: residual liquid temporary storage tank, regulating tank, filter, metering pump, valve, bypass and check valve.

[0091] Based on this, the system's operation process for recycling liquid-phase fermentation wastewater to solid-phase lactic acid fermentation via wastewater reuse pipelines can be as follows: Primary or secondary fermentation wastewater is collected, filtered, and adjusted before being transported to the solid-state lactic acid fermentation unit according to a set ratio; when not recycled, the wastewater bypasses the wastewater treatment interface. Specifically, primary or secondary fermentation wastewater, after being treated by a wastewater storage tank, filter, and adjustment tank, is transported to the solid-state lactic acid fermentation unit by a metering pump; the recycling rate is adjusted based on the wastewater's pH, COD, solids content, and nitrogen content; wastewater exceeding the process acceptance range bypasses the wastewater treatment interface.

[0092] In addition, the system can evaluate the reuse effect by comparing the lactic acid concentration, fermentation cycle, and acidified residue properties under three operating conditions: no reuse, primary residue reuse, and secondary residue reuse.

[0093] In this embodiment, the food waste resource recovery system can be configured with a residual liquid reuse pipeline, allowing the primary or secondary fermentation residual liquid to be temporarily stored, filtered, regulated, and metered before entering the solid residue lactic acid fermentation unit. The reuse ratio can be adjusted according to the residual liquid's pH, COD, solid content, and nitrogen content. Residual liquid that does not meet the reuse conditions is bypassed and enters the wastewater treatment interface. In this way, a controllable material linkage is formed between the liquid phase branch and the solid phase branch.

[0094] Next, embodiments of the food waste resource utilization method provided in this application will be presented.

[0095] Please refer to Figure 6 , Figure 6 The flowcharts illustrating the steps of the food waste resource utilization method provided in some embodiments of this application are shown. It should be understood that, although... Figure 6 The execution order of some method steps is shown, but based on different design needs of actual applications, the food waste resource utilization method provided in this application embodiment can of course adopt a different execution order of method steps than that shown in the figure. That is, Figure 6 The order of the method steps shown does not constitute a limitation on the execution logic order of the food waste resource utilization method provided in the embodiments of this application. Any other order based on... Figure 6 Reasonable changes to the sequence of steps shown should be included within the protection scope of the food waste resource utilization method provided in the embodiments of this application.

[0096] Furthermore, the food waste resource recovery method provided in this application is applied to the food waste resource recovery system described in any of the above embodiments. In the following text, the application of the food waste resource recovery system (hereinafter referred to as the system) to the food waste resource recovery system provided in this application will be used as an example to describe the food waste resource recovery method provided in this application in detail. The implementation of the food waste resource recovery method provided in this application in any other form of subject matter can refer to the process of applying the food waste resource recovery method in the system described below.

[0097] like Figure 6 As shown, in some embodiments, the food waste resource utilization method provided in this application may include steps S601 and S602 as shown below.

[0098] Step S601: The kitchen waste is subjected to hot water hydrolysis treatment based on the hot water hydrolysis phase separation module to obtain the hot water hydrolyzed kitchen waste.

[0099] The system can perform hydrothermal hydrolysis on food waste using a hydrothermal phase separation module, yielding hydrolyzed food waste. This process breaks down the organic structure of the food waste through hydrothermal reaction, releasing bound oils and intracellular organic matter, thus improving subsequent separation efficiency and the concentration of fermentable substrates.

[0100] In some embodiments, the system can first sort, remove impurities, crush, and adjust the slurry to a preset concentration from the kitchen waste, then send it to a hot water hydrolysis phase separation module for incubation at 80-140℃ for 30 minutes to complete the leaching of organic matter and the release of oil. For example, the system can sort the kitchen waste through a pretreatment and slurry adjustment module to remove impurities such as plastics and metals, crush it to a particle size ≤5mm, add water to adjust it into a uniform slurry with a total solids content of 10% TS, pump it into a hot water hydrolysis phase separation module (such as a hot water hydrolysis reactor), and heat it to 140℃ in a closed reactor, maintaining the temperature for 30 minutes, while keeping the stirring speed at 60 rpm during the reaction. After the reaction, the pressure is released and the material is discharged to obtain the hot water hydrolyzed kitchen waste slurry.

[0101] Step S602: Based on the oil-liquid-solid three-phase separation module, the kitchen waste after hot water hydrolysis is subjected to oil-liquid-solid three-phase separation treatment, and the oil phase is input into the oil recovery module for oil recovery treatment through the oil phase outlet, the liquid phase is input into the liquid phase biological fermentation module for primary filamentous fungal fermentation treatment through the liquid phase outlet, and the solid phase is input into the solid phase step conversion module for lactic acid fermentation treatment through the solid phase outlet.

[0102] After obtaining the hydrolyzed food waste, the system enters the separation and diversion node. Based on the oil-liquid-solid three-phase separation module, the hydrolyzed food waste is centrifuged to form an upper oil phase, a middle liquid phase, and a lower solid phase. The oil phase is transported to the oil recovery unit for purification to obtain crude oil product; the liquid phase is transported to the primary filamentous fungal fermentation unit to start primary fermentation; and the solid phase is transported to the solid residue lactic acid fermentation unit to start lactic acid fermentation. In this way, the system can send the hydrolyzed food waste to the appropriate resource utilization branch according to the physicochemical properties of the three phases, realizing the targeted high-value utilization of each component.

[0103] In some embodiments, the system can use an oil-liquid-solid three-phase separation module to send the hydrolyzed slurry (food waste after hydrolyzing) into a horizontal screw centrifuge and centrifuge it at 4600 rpm for 5 minutes. After centrifugation, the upper layer of floating oil is collected by an oil skimming device and transported to the oil recovery module through an oil phase pipeline. After sedimentation and filtration, crude oil product is obtained. The middle layer of clear liquid is the liquid phase and is transported to the primary filamentous fungal fermentation unit of the liquid phase biological fermentation module through a liquid phase pipeline to start primary fermentation. The lower layer of sludge is the solid phase and is transported to the solid sludge lactic acid fermentation unit of the solid phase cascade conversion module through a solid phase conveying device to start lactic acid fermentation.

[0104] In some embodiments, after the primary filamentous fungal fermentation reaches its endpoint in the liquid phase branch, mycelial fiber products and primary fermentation residue are obtained by separation; the primary fermentation residue can be directly or after temporary storage and adjustment into the secondary yeast or single-celled fungal fermentation unit, and yeast protein products and secondary fermentation residue are obtained after fermentation is completed.

[0105] In some embodiments, after the solid residue lactic acid fermentation reaches its endpoint in the solid phase branch, lactic acid products and acidified residue are separated by the diversion output unit; the lactic acid products are purified to obtain lactic acid products, and the acidified residue is dehydrated and then enters the pyrolysis / gasification unit, and finally the biochar, biooil and biogas products are recovered in stages. In some embodiments, the primary fermentation residue and / or secondary fermentation residue can be treated through a residue reuse pipeline and then supplemented to the solid residue lactic acid fermentation unit in a set proportion to supplement fermentable carbon sources and nutrients; residue exceeding the reuse range is sent to the wastewater treatment interface.

[0106] In this embodiment, the food waste resource utilization system has three outlets—oil, liquid, and solid—after three-phase separation via hot hydrolysis. These outlets are connected to an oil recovery branch, a liquid-phase bio-fermentation branch, and a solid-phase cascade conversion branch, respectively. The liquid-phase branch includes a primary filamentous fungal fermentation unit, a mycelial fiber separation and recovery unit, a primary fermentation residue outlet, a secondary yeast or single-celled fungal fermentation unit, and a yeast protein recovery unit. The mycelial fiber separation and recovery unit has both a mycelial product outlet and a primary fermentation residue outlet, which is connected to the secondary yeast or single-celled fungal fermentation unit. The solid-phase branch includes a solid residue lactic acid fermentation unit and a lactic acid product and acidified residue separation and output unit. The lactic acid product outlet of the separation and output unit is connected to a lactic acid recovery or utilization unit, and the acidified residue outlet is connected to a residue dehydration and thermochemical conversion branch. The acidified residue outlet is connected to a residue dehydration unit and a pyrolysis / gasification unit, allowing the acidified residue to enter subsequent carbon, oil, and gas staged recovery. Furthermore, pipelines can be installed to reuse primary or secondary fermentation residues in the solid residue lactic acid fermentation unit, enabling material linkage between the liquid-phase biological fermentation branch and the solid-phase cascade conversion branch. Thus, this embodiment solves the problem of traditional food waste treatment solutions struggling to achieve multi-level resource synergy. Compared to traditional food waste treatment solutions, this embodiment enables the graded and cascaded utilization of all components of food waste, significantly improving the resource utilization efficiency and added value of organic matter. In addition, the food waste resource utilization system provided in this embodiment has a clear structure and well-defined interfaces, combining operational flexibility and engineering feasibility, and can be adapted to food waste treatment scenarios of different scales.

[0107] Please see Figure 7This application also provides an electronic device that can be applied to the above-mentioned food waste resource recovery system. The electronic device includes a memory and a processor. The memory stores a computer program, and the processor executes the computer program to implement the above-mentioned food waste resource recovery method.

[0108] In some embodiments, the electronic device may be a device that integrates a food waste resource recovery system, or an electronic device such as a smartphone, tablet, laptop, or desktop computer that controls the integrated food waste resource recovery system.

[0109] like Figure 7 As shown, the electronic device provided in this application embodiment may include: The processor 701 can be implemented using a general-purpose CPU (Central Processing Unit), microprocessor, application-specific integrated circuit (ASIC), or one or more integrated circuits, and is used to execute relevant programs to implement the technical solutions provided in the embodiments of this application. The memory 702 can be implemented as a read-only memory (ROM), a static storage device, a dynamic storage device, or a random access memory (RAM). The memory 702 can store the operating system and other applications. When the technical solutions provided in the embodiments of this specification are implemented through software or firmware, the relevant program code is stored in the memory 702 and is called and executed by the processor 701 to execute the food waste resource recovery method of the embodiments of this application. The input / output interface 703 is used to implement information input and output; The communication interface 704 is used to enable communication and interaction between this device and other devices. Communication can be achieved through wired means (such as USB, Ethernet cable, etc.) or wireless means (such as mobile network, WIFI, Bluetooth, etc.). Bus 705 transmits information between various components of the device (e.g., processor 701, memory 702, input / output interface 703, and communication interface 704); The processor 701, memory 702, input / output interface 703, and communication interface 704 are connected to each other within the device via bus 705.

[0110] This application also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the above-described method for the resource recovery of food waste.

[0111] Memory, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs and non-transitory computer-executable programs. Furthermore, memory may include high-speed random access memory, and may also include non-transitory memory, such as at least one disk storage device, flash memory device, or other non-transitory solid-state storage device. In some embodiments, memory may optionally include memory remotely located relative to the processor, and these remote memories can be connected to the processor via a network. Examples of such networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof.

[0112] This application also provides a computer program product, including a computer program. The steps implemented by the computer program when executed by a processor are basically the same as those in the specific embodiments of the above-described method for the resource utilization of kitchen waste, and will not be repeated here.

[0113] The embodiments described in this application are for the purpose of more clearly illustrating the technical solutions of this application, and do not constitute a limitation on the technical solutions provided in this application. As those skilled in the art will know, with the evolution of technology and the emergence of new application scenarios, the technical solutions provided in this application are also applicable to similar technical problems.

[0114] Those skilled in the art will understand that the technical solutions shown in the figures do not constitute a limitation on the embodiments of this application, and may include more or fewer steps than shown, or combine certain steps, or different steps.

[0115] The system embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs.

[0116] Those skilled in the art will understand that all or some of the steps in the methods disclosed above, as well as the functional modules / units in the systems and devices, can be implemented as software, firmware, hardware, or suitable combinations thereof.

[0117] The terms “first,” “second,” “third,” “fourth,” etc. (if present) in the specification and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms “comprising” and “having,” and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0118] It should be understood that in this application, "at least one (item)" means one or more, and "more than" means two or more. "And / or" is used to describe the relationship between related objects, indicating that three relationships can exist. For example, "A and / or B" can represent: only A exists, only B exists, and both A and B exist simultaneously, where A and B can be singular or plural. The character " / " generally indicates that the preceding factor is divided by the following factor, or that the related objects are in an "or" relationship. "At least one (item) of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one (item) of a, b, or c can represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, and c can be single or multiple.

[0119] In the embodiments provided in this application, it should be understood that the disclosed systems and methods can be implemented in other ways. For example, the system embodiments described above are merely illustrative; for instance, the division of the units described above is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between systems or units may be electrical, mechanical, or other forms.

[0120] The units described above as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0121] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0122] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes multiple instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of this application. The aforementioned storage medium includes various media capable of storing programs, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0123] The preferred embodiments of the present application have been described above with reference to the accompanying drawings, but this does not limit the scope of the claims of the present application. Any modifications, equivalent substitutions, and improvements made by those skilled in the art without departing from the scope and substance of the embodiments of the present application shall be within the scope of the claims of the present application.

Claims

1. A system for the resource-based treatment of kitchen waste, characterized in that, The system includes: Hot water decomposition and phase separation module; An oil-liquid-solid three-phase separation module is provided, wherein the feed end of the oil-liquid-solid three-phase separation module is connected to the discharge end of the hot water hydrolysis module, and the oil-liquid-solid three-phase separation module is provided with an oil phase outlet, a liquid phase outlet and a solid phase outlet; An oil recovery module, wherein the feed end of the oil recovery module is connected to the oil phase outlet, the oil recovery module includes an oil recovery unit, and the oil recovery unit is provided with an oil product outlet; A liquid-phase biological fermentation module is connected to a liquid outlet. The liquid-phase biological fermentation module includes a primary filamentous fungal fermentation unit and a mycelial fiber separation and recovery unit connected in sequence. The mycelial fiber separation and recovery unit is provided with a mycelial product outlet. A solid-phase step-by-step conversion module is connected to the solid-phase outlet. The solid-phase step-by-step conversion module includes a solid residue lactic acid fermentation unit, a lactic acid product and acidified residue diversion and output unit, and a lactic acid recovery unit connected in sequence. The lactic acid recovery unit is provided with a lactic acid product outlet.

2. The food waste resource utilization system according to claim 1, characterized in that, The mycelial fiber separation and recovery unit is also equipped with a primary fermentation residue outlet, and the liquid-phase biological fermentation module further includes: A secondary yeast or single-celled fungal fermentation unit, wherein the feed end of the secondary yeast or single-celled fungal fermentation unit is connected to the outlet of the primary fermentation residue; A yeast protein recovery unit is provided, wherein the feed end of the yeast protein recovery unit is connected to the discharge end of the secondary yeast or single-celled fungal fermentation unit, and the yeast protein recovery unit is provided with a yeast protein product outlet.

3. The food waste resource utilization system according to claim 2, characterized in that, The yeast protein recovery unit is also provided with a secondary fermentation liquid outlet, and the feed end of the solid residue lactic acid fermentation unit is also connected to the primary fermentation liquid outlet and / or the secondary fermentation liquid outlet.

4. The food waste resource utilization system according to claim 3, characterized in that, The system also includes: The waste liquid reuse pipeline has its inlet connected to the outlet of the primary fermentation waste liquid and / or the outlet of the secondary fermentation waste liquid, and its outlet connected to the feed end of the solid residue lactic acid fermentation unit; the waste liquid reuse pipeline includes a waste liquid storage tank, a regulating tank, a filter, a metering pump, a valve and / or a check valve connected in sequence.

5. The food waste resource utilization system according to claim 4, characterized in that, The outlet of the secondary fermentation residue is connected to the wastewater treatment interface, and / or the outlet of the residue reuse pipeline is connected to the wastewater treatment interface.

6. The food waste resource utilization system according to claim 2, characterized in that, The liquid-phase bio-fermentation module also includes: A primary fermentation residue storage or regulation unit is provided, wherein the feed end of the primary fermentation residue storage or regulation unit is connected to the outlet of the primary fermentation residue, and the feed end of the secondary yeast or single-celled fungus fermentation unit is connected to the discharge end of the primary fermentation residue storage or regulation unit.

7. The food waste resource utilization system according to claim 1, characterized in that, The lactic acid product and acidification residue diversion and output unit is provided with a lactic acid product outlet and an acidification residue outlet, and the feed end of the lactic acid recovery unit is connected to the lactic acid product outlet. The solid-phase step-by-step conversion module also includes: A residue dewatering unit is connected to the acidified residue outlet; A pyrolysis and / or gasification unit, wherein the feed end of the pyrolysis and / or gasification unit is connected to the discharge end of the residue dewatering unit; A biochar-oil-gas grading and recovery unit is provided, wherein the feed end of the biochar-oil-gas grading and recovery unit is connected to the discharge end of the pyrolysis and / or gasification unit, and the biochar-oil-gas grading and recovery unit is provided with a biochar outlet, a biooil outlet and a biogas outlet.

8. A method for the resource-based treatment of kitchen waste, characterized in that, The method, applied to the food waste resource recovery system as described in any one of claims 1 to 7, comprises: The kitchen waste is subjected to hot water hydrolysis phase separation module to obtain hot water hydrolyzed kitchen waste; The oil-liquid-solid three-phase separation module is used to perform oil-liquid-solid three-phase separation treatment on the kitchen waste after hot water hydrolysis. The oil phase is fed into the oil recovery module for oil recovery treatment through the oil phase outlet, the liquid phase is fed into the liquid phase biological fermentation module for primary filamentous fungal fermentation treatment through the liquid phase outlet, and the solid phase is fed into the solid phase step conversion module for lactic acid fermentation treatment through the solid phase outlet.

9. An electronic device, characterized in that, The electronic device is applied to the food waste resource recovery system as described in any one of claims 1 to 7. The electronic device includes a memory and a processor. The memory stores a computer program. When the processor executes the computer program, it implements the food waste resource recovery method as described in claim 8.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when executed by a processor, implements the food waste resource recovery method as described in claim 8.

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