Kitchen garbage treatment system

Abstract

The utility model provides a kitchen garbage treatment system which comprises a garbage collection device and is characterized in that the garbage collection device is connected with the inlet end of a sorting and pulping device, the outlet end of the sorting and pulping device is connected with a sand and impurity removal device, and the outlet end of the sand and impurity removal device is connected with the inlet end of a damp and hot hydrolysis device; the outlet end of the moist heat hydrolysis device is connected with the three-phase centrifugal device, a liquid outlet and a slag outlet of the three-phase centrifugal device are connected with a feed port of the homogeneous mixing tank, a discharge port of the homogeneous mixing tank is connected with the wet anaerobic reactor, and the wet anaerobic reactor is connected with the solid-liquid separation device through a biogas slurry discharge port. A liquid phase outlet of the solid-liquid separation device is connected with a carbon source storage and compounding device through an MAP sedimentation tank; organic matters rich in the kitchen garbage are converted into a biological composite carbon source with a high additional value, and compared with a traditional kitchen garbage treatment technology in which the kitchen garbage is used for producing methane, the method has certain advantages, the income of main products is increased, and the generation of by-products and wastes is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of restaurant kitchen waste treatment technology, and in particular to a kitchen waste treatment system. Background Art

[0002] At present, climate change, mainly manifested in global warming, is one of the major issues facing human sustainable development. The world is facing the dual challenges of resource and energy shortage and carbon emission reduction. With the large-scale construction of biogas projects, anaerobic digestion has become an important means to achieve efficient and stable reduction of urban organic solid waste, biomass energy recovery and carbon emission reduction. However, the anaerobic treatment process of food waste / kitchen waste also has the following problems in the process of engineering application: (1) The process of anaerobic treatment of food waste / kitchen waste is long and the investment cost is high. It is suitable for treatment projects with large treatment volume and scale; (2) The degree of resource utilization of anaerobic treatment is general, the income of resource-based products is low, the operating cost is high, the income of biogas is low, and the treatment cost of by-products sludge and liquid is high; (3) The carbon emission reduction capacity is limited. The large consumption of by-product sludge dehydration reagents and sewage treatment electricity and reagents greatly reduces the carbon emission reduction level of anaerobic treatment.

[0003] my country's sewage treatment plants generally have problems with low influent concentration and insufficient carbon sources for denitrification and denitrification. Sewage treatment plants generally add chemical carbon sources such as sodium acetate, glucose, methanol, etc. to meet the requirements of meeting emission standards. The price of carbon sources is relatively high, resulting in high sewage treatment operating costs and increased carbon emissions. Therefore, reducing the use of chemical carbon sources, increasing the use of organic composite carbon sources, reducing costs, and improving carbon emission reduction levels have become inevitable requirements for sewage treatment plants to promote pollution reduction and carbon reduction and achieve green and low-carbon development.

[0004] The carbohydrate content in food waste / kitchen waste is relatively high, and the VFAs, lactic acid and other products produced by fermentation can be used as ideal carbon sources for denitrification. The process of making organic composite carbon sources for sewage treatment from food waste / kitchen waste has the advantages of short process flow, high carbon source product yield, and high degree of resource utilization, and has good development prospects.

[0005] Therefore, there is an urgent need to provide a kitchen waste treatment system to solve the defects and shortcomings in the above-mentioned prior art. Utility Model Content

[0006] The purpose of the utility model is to solve the shortcomings of the prior art and to propose a kitchen waste treatment system.

[0007] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0008] A kitchen waste treatment system comprises a garbage collection device, characterized in that: the garbage collection device is connected to the inlet end of a sorting and pulping device, the outlet end of the sorting and pulping device is connected to a sand and impurity removal device, the outlet end of the sand and impurity removal device is connected to the inlet end of a wet heat hydrolysis device, the outlet end of the wet heat hydrolysis device is connected to a three-phase centrifugal device, the liquid outlet and the slag outlet of the three-phase centrifugal device are connected to the feed inlet of a homogeneous mixing tank, the outlet of the homogeneous mixing tank is connected to a wet anaerobic reactor, the wet anaerobic reactor is connected to a solid-liquid separation device through a biogas slurry outlet, and the liquid phase outlet of the solid-liquid separation device is connected to a carbon source storage and compounding device via a MAP sedimentation tank.

[0009] As a further preferred embodiment of the present utility model, a centrifugal pump is provided between the outlet end of the sorting and pulping device and the inlet end of the sand and impurity removal device.

[0010] As a further preferred embodiment of the present invention, the particle size of the slurry discharged from the outlet end of the sand and impurity removal device is not greater than 5 mm.

[0011] As a further preferred embodiment of the utility model, the inlet end of the three-phase centrifugal device is connected to the outlet end of the wet heat hydrolysis device, and the liquid outlet and slag outlet of the three-phase centrifugal device are connected to the feed port of the homogenizing mixing tank through a screw pump.

[0012] As a further preferred embodiment of the utility model, it also includes a sludge storage tank, and the sludge storage tank is connected to the feed port of the homogenizing mixing tank.

[0013] As a further preferred embodiment of the present utility model, the wet anaerobic reactor is provided with a temperature control device, a pH control device, a pressure gauge and an observation port.

[0014] As a further preferred embodiment of the present invention, a directional fermentation bacterial agent is also added inside the wet anaerobic reactor.

[0015] As a further preferred embodiment of the present invention, the temperature range of the material inside the wet anaerobic reactor is 37±1° C., and the pH value is 10.

[0016] As a further preferred embodiment of the present invention, the solid-liquid separation device performs solid-liquid separation on the fermented slurry, wherein the mud cake formed by the solid phase is sent out through the solid phase outlet of the solid-liquid separation device.

[0017] As a further preferred embodiment of the utility model, the MAP sedimentation tank adopts magnesium ammonium phosphate precipitation method to remove ammonia nitrogen in the liquid phase and generate magnesium ammonium phosphate precipitate, and the carbon source storage and compounding device compounds the remaining slurry with traditional carbon source detection to produce a biological composite carbon source.

[0018] Compared with the prior art, the advantages and positive effects of the utility model are:

[0019] 1) The utility model provides a kitchen waste treatment system, which converts organic matter rich in kitchen waste into high value-added biological composite carbon sources. Compared with the traditional kitchen waste treatment technology of using kitchen waste for methane production technology, it has certain advantages, increases the profit of the main product, and reduces the generation of by-products and waste.

[0020] 2) The utility model provides a kitchen waste treatment system. Compared with the traditional anaerobic process for biogas dehydration and biogas purification which requires a large amount of electricity and chemicals, the system reduces energy consumption and chemical consumption by optimizing the process section, thereby improving carbon emission reduction capabilities.

[0021] 3) The utility model provides a kitchen waste treatment system. Sewage treatment plants generally have a problem of insufficient carbon sources, and the demand for carbon sources is large and the cost is high. This system prepares biocomposite carbon sources through kitchen waste, which can be used as a high-quality carbon source for sewage treatment, effectively reducing the use of various chemical carbon sources in sewage treatment plants, reducing operating costs and improving carbon emission reduction levels.

[0022] 4) The utility model provides a kitchen waste treatment system, which is provided with a wet anaerobic reactor, and uses a temperature control device, a pH control device, a pressure gauge and an observation port arranged thereon to detect and control the hydrolysis and acidification conditions in the anaerobic process in real time. Through directional acid production, it eliminates the purification and sludge treatment processes after the production of biogas by anaerobic digestion of general kitchen waste, simplifies the anaerobic process section and shortens the treatment process. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the system structure of the utility model;

[0024] Figure 2 It is a schematic diagram of the logic structure of the utility model. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0027] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] [First embodiment]

[0029] like Figure 1-2 The figure shows a kitchen waste treatment system provided by the first embodiment of the utility model, including a garbage collecting device 1, which is used to collect kitchen waste. The garbage collecting device 1 is connected to the inlet end of the sorting and pulping device 2, which removes large-particle impurities in the kitchen waste, crushes the kitchen waste after the impurities are separated, and then dilutes it to form a slurry. The outlet end of the sorting and pulping device 2 is connected to the sand and impurity removal device 3, which is used to separate solid impurities in the kitchen waste after crushing and pulping to ensure that the particle size of the slurry discharged from the outlet end of the sand and impurity removal device 3 is not more than 5 mm. A centrifugal pump is arranged between the outlet end of the sorting and pulping device 2 and the inlet end of the sand and impurity removal device 3, and the slurry prepared by the sorting and pulping device 2 is sent into the sand and impurity removal device 3 through the centrifugal pump.

[0030] The outlet end of the sand and impurity removal device 3 is connected to the inlet end of the wet heat hydrolysis device 4, the wet heat hydrolysis device 4 heats the slurry, and the outlet end of the wet heat hydrolysis device 4 is connected to the three-phase centrifugal device 5. The three-phase centrifugal device 5 extracts oil from the heated kitchen slurry, and obtains crude oil from the oil outlet of the three-phase separation device. The liquid outlet of the three-phase centrifugal device 5 is connected to the feed port of the homogenizing mixing tank 7 through a screw pump, and the slag outlet of the three-phase centrifugal device 5 is connected to the homogenizing mixing tank 7 through the first slag phase pipe 12, so as to enter the mixing tank 7 under the drive of the screw pump.

[0031] At the same time, the system also includes a sludge storage tank 6, which is connected to the feed port of the homogenizing mixing tank 7. The sludge in the sludge storage tank 6 can come from a sludge treatment plant. The discharge port of the homogenizing mixing tank 7 is connected to the wet anaerobic reactor 8 through the second slag phase pipe 13. The wet anaerobic reactor 8 is connected to the solid-liquid separation device 9 through the biogas slurry discharge port. The mud cake formed by the solid phase is sent out through the solid phase outlet of the solid-liquid separation device 9. The liquid phase outlet of the solid-liquid separation device 9 is connected to the carbon source storage and compounding device 11 through the MAP sedimentation tank 10.

[0032] Preferably, the wet anaerobic reactor 8 in this embodiment is provided with a temperature control device 14, a pH control device 15, a pressure gauge and an observation port to control the internal parameters of the wet anaerobic reactor 8. For example, as a preferred embodiment, the temperature range can be controlled at 37±1°C and the pH value can be controlled at 10. At the same time, a directional fermentation agent is added to the wet anaerobic reactor 8, and the directional anaerobic fermentation and acid production are carried out after hydraulic circulation stirring by a motor. Subsequently, the solid-liquid separation device 9 separates the fermented slurry into solid and liquid, and the mud cake produced can be used as aquaculture raw materials, and the filtrate enters the sedimentation tank for further treatment.

[0033] The solid-liquid separation device 9 performs solid-liquid separation on the fermented slurry, and the ammonia nitrogen in the liquid phase after the solid-liquid separation is removed by the magnesium ammonium phosphate precipitation (MAP) method adopted by the MAP sedimentation tank 10. The precipitation reaction between magnesium metal ions, phosphate ions and ammonia nitrogen ions is used to generate the precipitate of magnesium ammonium phosphate, so that the ammonia nitrogen component in the fermentation liquid is transferred to the precipitate. The remaining slurry is tested and compounded to form a biological composite carbon source, which effectively reduces the use of traditional chemical carbon sources in sewage treatment plants.

[0034] This embodiment converts the organic matter rich in kitchen waste into a high-value-added biocomposite carbon source, which has certain advantages over the traditional kitchen waste treatment technology that uses kitchen waste for methane production technology, increases the income of the main products, and reduces the generation of by-products and waste; at the same time, compared with the large amount of electricity and reagents required for the dehydration of biogas residues and the purification of biogas in the traditional anaerobic process, this system reduces energy consumption and drug consumption by optimizing the process section, thereby improving the carbon emission reduction capacity; in addition, sewage treatment plants generally have the problem of insufficient carbon sources, and the demand for carbon sources is large and the cost is high. The system can use the path of preparing biocomposite carbon sources from kitchen waste as a high-quality carbon source for sewage treatment, effectively reducing the use of various chemical carbon sources in sewage treatment plants, reducing operating costs and improving the level of carbon emission reduction; because a wet anaerobic reactor is provided, and the hydrolysis and acidification conditions in the anaerobic process are detected and controlled in real time by the temperature control device, pH control device, pressure gauge and observation port provided thereon, the purification and biogas residue treatment process after the general kitchen waste anaerobic digestion to produce biogas is omitted through directional acid production, and the anaerobic process section is simplified to shorten the treatment process.

[0035] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. A kitchen waste treatment system, comprising a waste collection device (1), characterized in that: The garbage collection device (1) is connected to the inlet end of the sorting pulping device (2), the outlet end of the sorting pulping device (2) is connected to the sand and impurity removal device (3), the outlet end of the sand and impurity removal device (3) is connected to the inlet end of the wet heat hydrolysis device (4), the outlet end of the wet heat hydrolysis device (4) is connected to the three-phase centrifugal device (5), the liquid outlet and the slag outlet of the three-phase centrifugal device (5) are connected to the feed inlet of the homogenizing mixing tank (7), the outlet of the homogenizing mixing tank (7) is connected to the wet anaerobic reactor (8), the wet anaerobic reactor (8) is connected to the solid-liquid separation device (9) through the biogas slurry outlet, and the liquid phase outlet of the solid-liquid separation device (9) is connected to the carbon source storage and compounding device (11) through the MAP sedimentation tank (10).

2. A kitchen waste treatment system according to claim 1, characterized in that: A centrifugal pump is provided between the outlet end of the sorting and pulping device (2) and the inlet end of the sand and impurity removal device (3).

3. A kitchen waste treatment system according to claim 1, characterized in that: The particle size of the slurry discharged from the outlet of the sand and impurity removal device (3) is no greater than 5 mm.

4. A kitchen waste treatment system according to claim 1, characterized in that: The inlet end of the three-phase centrifugal device (5) is connected to the outlet end of the wet thermal hydrolysis device (4), and the liquid outlet and the slag outlet of the three-phase centrifugal device (5) are connected to the feed port of the homogenizing mixing tank (7) via a screw pump.

5. The kitchen waste treatment system according to claim 1, characterized in that: It also includes a sludge storage tank (6), wherein the sludge storage tank (6) is connected to the feed inlet of the homogenizing mixing tank (7).

6. A kitchen waste treatment system according to claim 1, characterized in that: The wet anaerobic reactor (8) is provided with a temperature control device (14), a pH control device (15), a pressure gauge and an observation port.

7. A kitchen waste treatment system according to claim 6, characterized in that: Directional fermentation bacteria are also added inside the wet anaerobic reactor (8).

Images