Efficient kitchen garbage treatment system

Abstract

The utility model relates to an efficient kitchen garbage treatment system which comprises a crushing and sorting machine, a pretreatment device, a three-phase separator, an anaerobic fermentation device, a dehydrator, an MBR (Membrane Bioreactor) and an ozone-Fenton combined treatment system which are connected in sequence, marsh gas output by the anaerobic fermentation device is externally connected with a boiler system through a purification system, waste residue output of the dehydrator is connected with the input end of the RDF treatment system, and the boiler system provides steam for the RDF treatment system. According to the efficient kitchen waste treatment system, for a kitchen waste treatment plant with small daily treatment capacity, biogas of the kitchen waste treatment plant is used as a heat source, and biogas residues and pretreated impurities are used as raw materials to produce RDF; the problems of waste of biogas and increase of carbon emission caused by emergency treatment through torches due to the fact that less biogas generated in a factory cannot be used for power generation are solved, and the problem that the operation cost is increased due to treatment of biogas residues and pretreatment impurities is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of kitchen waste treatment, and more specifically, to an efficient kitchen waste treatment system. Background Art

[0002] With the continuous development of my country's economy and the advancement of garbage classification, kitchen waste is gradually separated and corresponding treatment facilities are constantly being built.

[0003] At present, the kitchen waste treatment facilities in first- and second-tier cities are gradually saturated and are being extended to third- and fourth-tier cities. However, the amount of kitchen waste generated in third- and fourth-tier cities is relatively small. After being treated by typical anaerobic treatment processes, the amount of biogas produced is relatively small, so it cannot be used for power generation or other further uses. Instead, it is burned by torches, which wastes energy and increases carbon emissions. The pretreatment system impurities and dehydrated biogas residues generated by kitchen waste projects are generally sent to domestic waste incineration plants for incineration treatment. This treatment process requires kitchen waste treatment plants to pay a certain amount of treatment fees, which increases operating costs.

[0004] Therefore, based on the above problems, it is urgent to invent an efficient food waste treatment system so as to effectively utilize the biogas produced by the fermentation of food waste and effectively treat the impurities in the pretreatment system and dehydrated biogas residue, thereby reducing the operating costs. Utility Model Content

[0005] The utility model provides a high-efficiency kitchen waste treatment system to solve the problems of waste and increased carbon emissions caused by the existing waste treatment, such as the small amount of biogas produced by the waste treatment being unable to be used for power generation and being treated through torch emergency treatment, as well as the problem of increased treatment costs due to the external transportation of biogas residues and pre-treated impurities.

[0006] According to one aspect of the utility model, a high-efficiency kitchen waste treatment system is provided, comprising a crushing and sorting machine, a pretreatment device, a three-phase separator, an anaerobic fermentation device, a dehydrator, an MBR reactor and an ozone-Fenton combined treatment system connected in sequence, wherein the output oil circuit of the three-phase separator is connected to a grease storage tank, the biogas output by the anaerobic fermentation device is connected to an external boiler system through a purification system, the waste residue output of the dehydrator is connected to the input end of an RDF treatment system, and the boiler system provides steam for the RDF treatment system.

[0007] Preferably, based on the above solution, the waste residue produced by the crushing and sorting machine and the waste residue produced by the pre-treatment device provide processing raw materials for the RDF processing system.

[0008] Preferably, based on the above scheme, a flotation tank is arranged between the dehydrator and the MBR reactor, the flotation tank receives the wastewater generated by the RDF treatment system, and the wastewater generated by the flotation tank provides treatment liquid for the MBR reactor, and the sludge generated by the flotation tank and the MBR reactor is connected to an external sludge tank.

[0009] Preferably, based on the above scheme, the output end of the sludge tank is connected to a sludge dewatering device, and the sludge dewatering device returns the generated wastewater to the flotation tank, and recycles the waste residue generated by the sludge dewatering device into the pretreatment device.

[0010] Preferably, based on the above scheme, the pretreatment device includes a high-temperature digester and a debris remover and sand remover. The high-temperature digester receives the output material of the crushing and sorting machine, and the debris remover and sand remover receives the output material of the high-temperature digester and is externally connected to the three-phase separator.

[0011] Preferably, based on the above solution, the boiler system provides steam for the high-temperature boiler.

[0012] The utility model discloses an efficient kitchen waste treatment system, which is aimed at kitchen waste treatment plants with small daily processing volume. It uses the biogas of the kitchen waste treatment plant as a heat source, and the biogas residue and pre-processed impurities as raw materials to produce RDF, which solves the problem of biogas waste and increased carbon emissions caused by emergency treatment of biogas produced by torches because the biogas produced in the plant is too small to be used for power generation, as well as the problem of increased operating costs due to the treatment of biogas residue and pre-processed impurities.

[0013] The utility model discloses a high-efficiency kitchen waste treatment system, which uses the biogas sludge and pre-treatment impurities generated by kitchen waste treatment as raw materials for producing RDF, and uses the steam generated by the boiler system to dry the solid residue and biogas sludge of the pre-treatment system to reduce their moisture content. This not only solves the problem of biogas waste and increased carbon emissions caused by the fact that the biogas generated in the plant area is too little to be used for power generation and has to be treated through torch emergency, but also solves the problem of increased operating costs due to the treatment of biogas sludge and pre-treatment impurities.

[0014] Compared with the prior art, the utility model does not require an external heat source when producing RDF, and can realize the recycling and utilization of biogas, thereby reducing its overall loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following is a brief introduction to the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0016] Figure 1This is a flow chart of the efficient kitchen waste treatment system of the utility model. DETAILED DESCRIPTION

[0017] The following is a further detailed description of the specific implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0018] It should be understood that when used in this specification and the appended claims, the term "comprising" indicates the presence of described features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or collections.

[0019] In order to simplify the drawings, only the parts related to the utility model are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically drawn or marked. In this article, "one" not only means "only one", but also means "more than one".

[0020] It should be further understood that the term “and / or” used in the specification and appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0021] In the embodiments shown in the drawings, the directions (such as up, down, left, right, front and back) used to explain the structure and movement of the various components of the present invention are not absolute but relative. These descriptions are appropriate when the components are in the positions shown in the drawings. If the description of the positions of the components changes, the directions also change accordingly.

[0022] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0023] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the specific implementation methods of the utility model will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0024] See also Figure 1The utility model is a high-efficiency kitchen waste treatment system, comprising a crushing and sorting machine, a pretreatment device, a three-phase separator, an anaerobic fermentation device, a dehydrator, an MBR reactor and an ozone-Fenton combined treatment system connected in sequence, the output oil circuit of the three-phase separator is connected to a grease storage tank, the biogas output by the anaerobic fermentation device is connected to an external boiler system through a purification system, the waste residue output of the dehydrator is connected to the input end of the RDF treatment system, and the boiler system provides steam for the RDF treatment system.

[0025] The waste residue produced by the crushing and sorting machine of the utility model and the waste residue produced by the pre-treatment device provide processing raw materials for the RDF processing system.

[0026] The utility model also provides a flotation tank between the dewatering machine and the MBR reactor, the flotation tank receives wastewater generated by the RDF treatment system, and the wastewater generated by the flotation tank provides treatment liquid for the MBR reactor. The sludge generated by the flotation tank and the MBR reactor is externally connected to a sludge dewatering machine, and the output end of the sludge dewatering machine is connected to a sludge dewatering device, which returns the generated wastewater to the flotation tank and recycles the waste residue generated by it into the pretreatment device.

[0027] When working, the garbage entering the factory first passes through the automatic control system monitoring scale, and then enters the receiving hopper after weighing, card swiping, and recording. The material is transported to the coarse crusher through the shaftless screw conveyor with drainage function at the bottom. The free liquid drained during the transmission process is stored in the drain tank. The solid material output after drainage is crushed to less than 30*80mm by the coarse crusher, and the homogeneous material obtained enters the crushing and sorting machine for further crushing and impurity separation. The impurities with a particle size of more than 20mm in the material are separated out of the system through the spiral by mechanical sorting, and the homogeneous material mainly composed of organic matter enters the pretreatment device, while the impurities are sent to the RDF system to produce RDF.

[0028] The pretreatment device includes a high-temperature digester and a debris and sand remover. The high-temperature digester receives the output material of the crushing and sorting machine, and the debris and sand remover receives the output material of the high-temperature digester and is externally connected to a three-phase separator.

[0029] High temperature digester treatment is a process of heating food waste and sludge under certain conditions. That is, when the food waste is heated to 130-140℃ and kept warm for 30-60 minutes, the soluble organic matter in it is fully degraded and dissolved in water to form anaerobic slurry, and the animal and vegetable oils combined in the material are fully separated, that is, the organic matter in the material is dissolved, the fiber is refined, the viscosity coefficient of the material is reduced, and it has good fluidity.

[0030] The design pressure of the high-temperature steam cooker is 0.6MPa, and it is directly heated by steam. The automatic control system uses PLC programmable control to monitor the liquid level, temperature, pressure and insulation time in real time during the reaction process.

[0031] The material treated by the high-temperature digester is discharged to the buffer temperature regulating tank by pressure. If the temperature of the material in the buffer tank is too high, part of the leachate can be mixed with the material in the buffer tank to adjust the liquid temperature to below 85°C to ensure that it is consistent with the working temperature of the three-phase separation. The temperature-adjusted material is pumped into the impurity and sand remover by the pump. The impurity and sand remover separates the undegraded organic matter with a particle size of >2mm, and squeezes and dehydrates it. The coarse residue is collected and sent to the RDF system. The slurry with a particle size of ≤2mm is collected into the liquid storage tank through the pipeline, and the material deposited at the bottom of the liquid storage tank is transported to the desander for sand removal. The separated fine sand is transported out, and the slurry is returned to the liquid storage tank.

[0032] The material in the liquid storage tank is stirred to obtain a homogeneous material, which is then pumped into the three-phase separator. The oil with a smaller specific gravity floats on the surface, and the liquid phase and the solid phase sink, so that the oil is separated through the oil outlet, the liquid phase is separated from the liquid phase outlet, and the solid slag is separated from the slag outlet by a spiral; the oil phase (industrial crude oil) flows by gravity into the oil storage tank and is regularly pumped into the outdoor oil storage tank; the liquid phase flows into the carbon source box and is pumped into the equalization tank to serve as a carbon source for the MBR reactor, and the remaining part and the solid phase flow by gravity into the slag box through the pipeline and are regularly sent to the anaerobic fermentation device.

[0033] It should be noted that the utility model also provides an anaerobic water inlet tank between the anaerobic fermentation device and the three-phase separator, that is, the pre-treated kitchen waste slurry is lifted to the anaerobic water inlet tank by the liquid phase pump for temporary storage. Here, it is cooled by heat exchange with circulating water through a shell-and-tube heat exchanger, and after the temperature drops to 38°C, it is pumped into the CSTR anaerobic tank. The grease produced in the anaerobic water inlet tank is pumped back to the high-temperature digester through the water inlet tank oil discharge pump.

[0034] The anaerobic fermentation device of the utility model adopts medium-temperature anaerobic fermentation with a reaction temperature of 38±1℃. The material produces biogas under the action of sludge in the tank, which is transported to the back-end biogas purification system through pipelines. After anaerobic fermentation, the digestate enters the water outlet tank, and then is dehydrated by the dehydrator through the biogas residue. The feed pump transports the digestate to the sewage treatment system for treatment.

[0035] The effluent from the anaerobic fermentation device is lifted to the sludge dehydration centrifuge by the sludge dehydration feed pump, and the sludge (water content <80%) produced after centrifugation is sent to the sludge hopper and then to the RDF system for treatment; the sewage flows into the leachate tank and is then pumped to the flotation tank to remove grease and suspended solids. The effluent from the flotation tank enters the equalization tank to buffer the impact of water volume on the subsequent biochemical system and adjust the nutrient element ratio of the water quality.

[0036] The effluent from the equalization tank is lifted by the wastewater lifting pump of the equalization tank to the MBR reactor, which consists of a two-stage nitrification and denitrification system and an external ultrafiltration. The sewage flows through the primary denitrification tank, the primary nitrification tank, the secondary denitrification tank and the secondary nitrification tank in sequence. In the nitrification system, the residual organic matter, ammonia nitrogen, nitrate nitrogen, etc. in the leachate are degraded and removed under alternating anoxic and aerobic conditions through the reflux of the nitrification liquid. The muddy and water mixture of the secondary denitrification effluent is lifted to the ultrafiltration system by the ultrafiltration inlet pump for mud-water separation, and the clear liquid enters the subsequent treatment unit. The ultrafiltration concentrated sludge (nitrification liquid) is refluxed to the primary denitrification tank, the secondary denitrification tank and the sludge dewatering machine.

[0037] The biochemical sludge is discharged into the sludge dewatering machine through the sludge dewatering feed pump for dehydration treatment. The sludge produced by dehydration (water content <80%) and the dehydrated biogas residue are discharged into the sludge hopper through the spiral, the dehydrated clear liquid is discharged into the leachate pool, and the dehydrated sludge is sent to the high-temperature digester.

[0038] The effluent of the utility model has good water quality after the MBR reactor, but it is difficult to meet the discharge standard due to the presence of refractory organic matter. The ozone treatment system decomposes the refractory macromolecular organic matter into small molecular organic matter through chain breaking and ring opening, providing conditions for subsequent Fenton further treatment.

[0039] The effluent after ozone treatment is further treated by Fenton, using H2O2 in Fe 2+ The hydroxyl radicals generated when decomposing in an acidic environment oxidize the reducing substances in the water to reduce COD, and at the same time oxidize the Fe 3+ It can be used as a coagulant to remove pollutants such as TP and SS in water through coagulation and sedimentation.

[0040] The utility model uses the steam generated by the boiler system to first dry the solid slag and biogas slag of the pretreatment device to the moisture content required for making RDF, and then sends the crushed materials to the RDF molding machine for compression molding through a belt conveyor. The molded RDF is sold or sent to a domestic waste treatment plant for combustion and power generation, thereby realizing further resource utilization of the waste.

[0041] It should be noted that the utility model has set up an automatic carbon emission accounting device in the factory area to calculate the carbon emissions within the site, including methane detection, nitrous oxide probe, biogas monitoring, electricity collection, water collection, water quality analyzer and other collection modules of all systems in the site, display, processor, network adapter and wireless communication module and other automatic accounting modules, so as to realize automatic accounting of carbon emissions.

[0042] The utility model discloses a high-efficiency kitchen waste treatment system, which is aimed at kitchen waste treatment plants with a small daily processing volume. It utilizes the biogas of the kitchen waste treatment plants as a heat source, and uses biogas residue and pre-treatment impurities as raw materials to produce RDF, thereby solving the problems of biogas waste and increased carbon emissions caused by emergency treatment of biogas produced by torches because the biogas generated in the plant is too small to be used for power generation, as well as the problem of increased operating costs due to the treatment of biogas residue and pre-treatment impurities.

[0043] The utility model discloses a high-efficiency kitchen waste treatment system, which uses biogas residue and impurities produced by kitchen waste treatment as raw materials for producing RDF, and uses steam generated by a boiler system to dry solid residue and biogas residue of a pretreatment system to reduce their moisture content.

[0044] Compared with the prior art, the utility model does not require an external heat source when producing RDF, and can realize the recycling of biogas, and the boiler system can also provide a heat source for the high-temperature digester, reducing its overall loss.

[0045] After the kitchen waste and biochemical sludge of the utility model are cooked at high temperature, the solid matter is dissolved in the liquid phase, and after three-phase separation, the liquid phase can be used as a carbon source for the MBR reactor, thus saving the cost of purchasing carbon sources.

[0046] The floating grease temporarily stored in the anaerobic fermentation feed of the utility model can be returned to the front end together with the water impurities in the grease storage tank to extract the oil again, thereby improving the purity of the grease in the grease storage tank and preventing the grease from entering the anaerobic fermentation and affecting the operation of the system.

[0047] The sludge generated by the sewage treatment system of the utility model is wet-heat pre-treated together with the kitchen waste, which is beneficial to the operation of the anaerobic fermentation system and reduces the cost of biogas residue treatment.

[0048] Finally, the method of this application is only a preferred implementation scheme and is not intended to limit the protection scope of the utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. An efficient kitchen waste treatment system, characterized in that: The invention comprises a crushing and sorting machine, a pretreatment device, a three-phase separator, an anaerobic fermentation device, a dehydrator, an MBR reactor and an ozone-Fenton combined treatment system connected in sequence. The output oil circuit of the three-phase separator is connected to a grease storage tank. The biogas output by the anaerobic fermentation device is connected to an external boiler system through a purification system. The waste residue output of the dehydrator is connected to the input end of the RDF treatment system. The boiler system provides steam for the RDF treatment system.

2. The efficient kitchen waste treatment system according to claim 1, characterized in that: The waste residue produced by the crushing and sorting machine and the waste residue produced by the pre-treatment device provide processing raw materials for the RDF processing system.

3. The efficient kitchen waste treatment system according to claim 1, characterized in that: An air flotation tank is arranged between the dehydrator and the MBR reactor, the air flotation tank receives wastewater generated by the RDF treatment system, and the wastewater generated by the air flotation tank provides treatment liquid for the MBR reactor. The sludge generated by the air flotation tank and the MBR reactor is connected to an external sludge tank.

4. The efficient kitchen waste treatment system according to claim 3, characterized in that: The output end of the sludge tank is connected to a sludge dewatering device, which returns the generated wastewater to the flotation tank and recycles the generated waste residue into the pretreatment device.

5. The efficient kitchen waste treatment system according to claim 4, characterized in that: The pretreatment device includes a high-temperature digester and a debris and sand remover. The high-temperature digester receives the output material of the crushing and sorting machine, and the debris and sand remover receives the output material of the high-temperature digester and is externally connected to the three-phase separator.

6. The efficient kitchen waste treatment system according to claim 5, characterized in that: The boiler system provides steam for the high temperature boiler.

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