Enzyme-heat combined enhanced biological drying device for kitchen garbage

Abstract

The utility model discloses an enzyme-heat combined enhanced kitchen garbage biological drying device which comprises a biological drying bin and a leachate collecting bin, the biological drying bin is located above the leachate collecting bin, the biological drying bin and the leachate collecting bin are separated through a porous filter plate, the biological drying bin is connected with a compound enzyme adding device, a microbial inoculum adding device and a conditioner adding device, and the compound enzyme adding device is connected with the microbial inoculum adding device. Dry air is introduced into the side wall of the leachate collecting bin, a water absorption sponge is arranged at the top of the bio-drying bin, a space is formed between the water absorption sponge and materials in the bin, an air outlet pipe of the bio-drying bin penetrates through the water absorption sponge and is communicated with the space and the space outside the bin, a heating belt is arranged on the outer wall of the bio-drying bin, and a heat preservation layer is wrapped on the outer wall of the bio-drying bin. A temperature recorder and a stirring device are arranged in the biological drying bin.

Description

Technical Field

[0001] The invention belongs to the technical field of kitchen waste treatment, relates to a biological drying treatment process, and particularly relates to an enzyme-heat combined enhanced kitchen waste biological drying device. Background Art

[0002] Kitchen waste refers to garbage generated in residents' daily lives and in food processing, catering services, and unit meal supply activities, including discarded vegetable leaves, leftovers, leftover rice, fruit peels, egg shells, tea dregs, bones (chicken bones, fish bones), etc. Its main sources are home kitchens, restaurants, hotels, canteens, markets, and other industries related to food processing.

[0003] Bio-drying is a method of treating kitchen waste. Generally speaking, the traditional bio-drying cycle is 7-15 days, and the drying effect is poor in the early and late stages of bio-drying, resulting in a long drying time. Even after extending the residence time in the low-temperature stage, the moisture content of the final product may still be higher than 45%, which is not only low in stabilization, but also far higher than the moisture content requirement for the preparation of derivative fuel RDF (<25%) or the moisture content requirement for spontaneous combustion of materials (<30%). Summary of the invention

[0004] In order to overcome the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide an enzyme-heat combined enhanced kitchen waste bio-drying device to solve the problems of long bio-drying cycle and low drying degree.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] The invention discloses an enzyme-heat combined enhanced kitchen waste bio-drying device, comprising a bio-drying bin and a leachate collecting bin, wherein the bio-drying bin is located above the leachate collecting bin and the two are separated by a porous filter plate, the bio-drying bin is connected with a composite enzyme dosing device, a bacterial agent dosing device and a conditioning agent dosing device, dry air is introduced into the side wall of the leachate collecting bin, a water-absorbing sponge is arranged on the top of the bio-drying bin, a space is provided between the water-absorbing sponge and the material in the bin, an air outlet pipe of the bio-drying bin passes through the water-absorbing sponge, and the space is connected with the space outside the bin, a heating belt is arranged on the outer wall of the bio-drying bin and wrapped with a heat-insulating layer, and a temperature recorder and a stirring device are arranged in the bio-drying bin.

[0007] In one embodiment, the composite enzyme dosing device is composed of a mixer and an enzyme dosing device, wherein the enzyme dosing device includes a carbohydrase dosing device, a protease dosing device and a lipase dosing device, and the outlet of the enzyme dosing device is connected to the mixer, and the outlet of the mixer is connected to the biological drying bin.

[0008] In one embodiment, an air inlet is provided at an upper middle portion of a side wall of the leachate collection bin, and the air inlet is connected to a dry air generating device, and the dry air generating device includes an air pump, a drying bottle and a flow meter.

[0009] In one embodiment, the wall of the biological drying bin is an organic glass partition, the organic glass partition is a hollow double-layer glass structure, the hollow layer is an air layer, and the outer wall of the organic glass partition is provided with a heating belt and wrapped with an insulation layer.

[0010] In one embodiment, the pore size of the porous filter plate is d, and d is the upper limit of the particle size of the kitchen waste in the biological drying bin that is crushed.

[0011] In one embodiment, the bio-drying bin contains a nylon filter of equal size of 60 mesh, and the kitchen waste is put into the filter to form a pile.

[0012] In one embodiment, the gas outlet pipe is connected to a serpentine condenser outside the biological drying chamber, and the serpentine condenser is connected to a gas collecting bottle.

[0013] In one embodiment, the heating belt is heated by a resistance wire and is evenly wound around the outer wall of the biological drying bin, and the heating temperature is 30-37°C.

[0014] In one embodiment, the temperature recorder is connected to the heating belt and a heating controller. When the temperature of the temperature recorder is higher than 40°C for the first time, the heating controller controls the heating belt to stop heating after 1 to 2 hours, and restarts heating when the temperature of the temperature recorder is lower than 40°C.

[0015] The method for bio-drying kitchen waste by using the device of the present invention comprises the following steps:

[0016] Step 1, using a composite enzyme dosing device, add composite enzymes to the kitchen waste according to a pre-configured enzyme activity ratio. By adding enzymes to the biological drying system, the efficient catalytic effect of the enzymes is used to efficiently hydrolyze organic matter, and the complex macromolecular organic matter that is difficult for microorganisms to use is hydrolyzed into small molecular organic matter that is easy for microorganisms to use, creating a good metabolic and reproductive environment for microorganisms, accelerating microbial growth, enhancing microbial metabolic activities, and further accelerating the generation of microbial bioheat, achieving the removal of organic matter and water, and achieving the purpose of strengthening the reduction effect of biological drying.

[0017] Step 2, adding bacterial agents and conditioning agents to the kitchen waste, adjusting the moisture content and carbon-nitrogen ratio, and mixing them evenly in the biological drying bin to form a pile. Further, a nylon filter can be installed.

[0018] Step 3, start the external auxiliary heat, that is, the heating belt, to heat up the pile in the reaction device, and use the air pump for continuous aeration. The internal temperature of the pile is maintained for 1 to 2 hours after leaving the low temperature stage, and then stop heating. The external auxiliary heat temperature is 30-37°C, and the low temperature stage refers to the biological drying stage with a temperature of ≤40°C.

[0019] Step 4, when the stack enters the low temperature stage again, the heat generation capacity is low. At this time, the external auxiliary heat (temperature is the same as above) can be restarted to heat the stack.

[0020] By assisting the biological drying system with external heating, on the one hand, the temperature of the pile can be increased, suitable enzyme hydrolysis conditions can be provided, enzyme activity can be enhanced, the hydrolysis effect of organic matter can be further improved, small molecule organic matter can be provided, the metabolic intensity of microorganisms can be enhanced, and the amount of bioheat generated can be increased; on the other hand, the external auxiliary heat can directly heat the pile, increase the moisture carrying capacity of the air, accelerate the conversion of moisture into water vapor, strengthen the moisture removal effect of biological drying, and further improve the reduction effect.

[0021] Furthermore, by adopting a heating mode of heating at both ends, a moisture removal effect similar to that of full-process heating is achieved, and energy consumption is greatly reduced, and the degree of degradation of organic matter is increased, further improving the degree of reduction.

[0022] Step 5: When the moisture content of the pile drops below 40%, the material can be discharged, completing a processing cycle. Part of the discharged material is used as return material, and the rest is recycled. The entire processing cycle is 3-4 days.

[0023] Step 6, replacing the complex enzyme in step 1 with the return material in step 5, and repeating the actions from step 2 to step 5 3 to 5 times, thereby long-term operation for a total of 4 to 6 treatment cycles.

[0024] The kitchen waste described in the present invention mainly includes typical kitchen waste, high-protein kitchen waste, high-fat kitchen waste and canteen kitchen waste, among which the typical kitchen waste, high-protein kitchen waste and high-fat kitchen waste are mainly carbohydrates, proteins and fats respectively, and the canteen kitchen waste is the remaining material after draining.

[0025] In one embodiment, to further improve the treatment effect, before step 1, remove the hard-to-degrade impurities such as plastics and shells in the kitchen waste, and then crush the kitchen waste to a particle size of ≤5mm before entering step 1. Smaller particle sizes can better contact the enzyme, improve the catalytic efficiency of the enzyme, and increase the contact area with the microorganisms in the bacterial agent, which is beneficial to the metabolic activity of the microorganisms. Correspondingly, in step 2, the nylon filter used is 60 mesh.

[0026] The complex enzyme of the present invention includes carbohydrase, protease and lipase, and the enzyme activity ratio is formulated according to the ratio of the activities of various enzymes in the complex enzyme. In the prior art, the complex enzyme is prepared according to the enzyme mass ratio. For example, 8g of complex enzyme is added. According to the mass ratio of 1:2:1, the masses of carbohydrase, protease and lipase are 2g, 4g and 2g respectively; assuming that the enzyme activities of 1g of carbohydrase, 1g of protease and 1g of lipase are 5000U, 50000U and 10000U respectively, if the enzyme activity ratio is 1:2:1, 4.7g, 0.9g and 2.4g are added respectively. Enzyme activity refers to the ability of an enzyme to catalyze a certain chemical reaction; under optimal conditions, the amount of enzyme required to convert 1 micromole of substrate in 1 minute is one enzyme activity unit (U). It can be seen that the speed of the enzymatic hydrolysis reaction here is directly proportional to the enzyme activity of various complex enzymes rather than the enzyme quality, and the enzyme activity of the same enzyme produced by different manufacturers is different. The optimal enzyme addition quality and ratio obtained by enzyme activity ratio are more universal and scientific. Experiments have confirmed that under the condition of adding the same mass of complex enzymes, the kitchen waste hydrolysis rate (expressed by the amount of dissolved organic matter, i.e. soluble COD) according to the enzyme activity ratio is more than 30% higher than that according to the enzyme mass ratio.

[0027] In one embodiment, in step 1, the dosage of the compound enzyme is 0.1-2wt% of the wet weight of the kitchen waste to enhance the degradation of organic matter. The enzyme activity ratio is set to a carbohydrase, protease and lipase activity ratio of 1:2:1. Under this ratio, the best drying effect and efficiency can be obtained for various types of kitchen waste.

[0028] In one embodiment, the carbohydrase may be one or more of α-amylase, glucoamylase, arabinoxylanase, cellulase and glucanase, and when there are multiple types, they are prepared with equal enzyme activity. The protease may be an acid protease.

[0029] In one embodiment, the dosage of the bacterial agent is 5-10wt% of the kitchen waste, and the dosage of the conditioning agent is 10-20wt% of the kitchen waste.

[0030] In one embodiment, the pile is aerated by an air pump to provide an aerobic atmosphere for aerobic microorganisms, and the flow rate of the aeration is controlled by a flow meter at 0.5-1.5 L·kg based on the weight of the pile material. -1 ·min -1 .

[0031] In one embodiment, the types of bacterial agents include but are not limited to EM bacterial agents, Bacillus subtilis, etc., and a combination of multiple bacterial agents can also be used; the conditioning agent is wood cellulose biomass such as sawdust, straw and corn cobs, and one or a combination of multiple conditioning agents can be used. The size of the conditioning agent is ≤10mm. On the one hand, it can adjust the moisture content of kitchen waste, and on the other hand, it can act as a bulking agent to provide sufficient free airspace.

[0032] In one embodiment, the exogenous auxiliary heat adopts electric heating, and the reduction effect of bio-drying is enhanced by heat assistance, which can improve the degree of reduction and shorten the required time. When the temperature reaches 40-45°C, the heating is restarted after a delay of a period of time until the next low-temperature stage. The heat production capacity of the pile body usually decreases after 72 hours and enters the low-temperature stage (temperature ≤ 40°C), and the exogenous heating is restarted at this stage. The present invention heats the pile body in the low-temperature stage, which helps to increase the temperature of the pile body, increase enzyme activity and enhance microbial metabolism; in the non-heating stage, microorganisms degrade organic matter to generate bioheat to maintain the high-temperature stage of the pile body. Compared with traditional heating, the enzyme-heat combination mode is more energy-efficient.

[0033] In one embodiment, the compost is turned intermittently during the entire bio-drying period to increase the uniformity of the compost, increase the contact area between enzymes and organic matter, the contact area between microorganisms and organic matter, and ensure a suitable free airspace in the compost. The frequency of turning the compost is 0.5-1 times / day.

[0034] In one embodiment, in step 5, the discharged material still contains the added complex enzyme, and the discharged material can be recycled to replace the addition of the complex enzyme, thereby reducing costs and increasing efficiency; generally speaking, when used as recycled material, the amount of recycled material is 60-80% of the discharged material amount.

[0035] In one embodiment, in step 2, a conditioner is added to adjust the initial moisture content of the pile to control the moisture content at 55-65%. After running a treatment cycle (3 to 4 days) of enzyme-heat combined biological drying, the moisture content drops to 30-40%, and the moisture removal rate is 65-80%.

[0036] Furthermore, the kitchen waste with enzymes, bacterial agents and conditioning agents is put into the filter bag as a whole, and the filter bag is put into the drying bin, the filter bag is closely attached to the drying bin, and the bottom of the filter bag is above the porous filter plate. The use of the filter bag is also convenient for weighing and measuring (weighing the filter bag as a whole) in the discharging and returning operations in steps 5 and 7.

[0037] The device of the present invention sets an air layer, a heating belt and thermal insulation cotton outside the drying chamber. The purpose of the air layer is twofold. One is to slow down the transfer rate of heat from the drying chamber to the outside when the temperature inside the chamber is higher than the temperature of the heating belt (30-37°C), thereby reducing the heat loss of biological production. The second is that although the heating belt is temperature-controlled at a value within 30-37°C, its power is generally required to be relatively large (fast heating). When the heating belt is started to heat, the temperature generally rises quickly and can reach 40 to 50 degrees, which is much higher than the required set temperature. If there is no air layer as a buffer and insulation, this rapid temperature increase will cause the temperature inside the drying chamber to change, which will have an adverse effect on the metabolism of microorganisms. The purpose of setting thermal insulation cotton outside the heating belt is to slow down the heat dissipation loss from the heating belt to the outside air.

[0038] Compared with the prior art, the present invention provides a device for the rapid reduction method of kitchen waste by enzyme-heat combined biological drying, which can facilitate the addition of compound enzymes, bacterial agents and conditioning agents, and conveniently control the heating rhythm of the controller to achieve the purpose of strengthening biological drying. It can also be used as an experimental device to calculate the effect of the above drying method by calculating the experimental process data, and feedback to adjust its key parameters such as enzyme activity ratio. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a process flow chart of the method for rapid reduction of kitchen waste provided by the present invention.

[0040] Figure 2 It is a schematic diagram of the structure of the device used in the present invention.

[0041] Figure 3 This is a schematic diagram of the change in moisture content of kitchen waste during a long period of time in an embodiment of the present invention.

[0042] Figure 4 This is a schematic diagram of the change in moisture removal rate of kitchen waste during a long-term process in an embodiment of the present invention.

[0043] In the figure: 1. air pump 2. drying bottle 3. porous filter plate 4. collecting bottle 5. temperature recorder 6. flow meter 7. water-absorbing sponge 8. air layer 9. thermal insulation cotton 10. serpentine condenser 11. heating belt 12. air inlet 13. biological drying chamber 14. leachate collecting chamber 15. organic glass partition 16. air outlet pipe 17. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described clearly and completely below. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] If no specific techniques or conditions are specified in the examples, all are carried out according to conventional methods or the techniques or conditions described in the literature in the field, or according to the product instructions. If no manufacturer is specified for the reagents and instruments used, all are conventional products that can be purchased through regular channels.

[0046] The process flow chart of the following embodiment is as follows Figure 1 As shown, the device is used as Figure 2 As shown in the figure, the moisture content of enzyme-heat combined biological drying changes in the long term. Figure 3 As shown, the moisture removal rate changes as Figure 4 shown.

[0047] refer to Figure 1 As shown, the enzyme-heat combined enhanced kitchen waste bio-drying method of this embodiment mainly includes the following steps:

[0048] (1) Take the canteen kitchen waste, drain the free water, pick out the hard-to-degrade materials such as shells, and crush them with a meat grinder. The kitchen waste is crushed to less than 5 mm for subsequent bio-drying. Take 320g of the crushed kitchen waste for reduction. It is worth noting that this step is not necessary. In the absence of crushing conditions or the timeliness requirement is not high or the size of the kitchen waste itself is not too large, you can go directly to the next step.

[0049] (2) The compound enzyme is prepared according to the enzyme activity ratio. The enzyme activity ratio used is carbohydrase: protease: lipase = 1:2:1. This ratio is applicable to typical kitchen waste, high-protein kitchen waste, and high-fat kitchen waste, with the widest range. The compound enzyme dosage is 1wt% of the crushed kitchen waste. The bacterial agent used is EM bacterial agent, and the bacterial agent dosage is 5wt% of the crushed kitchen waste. The compound enzyme and EM bacterial agent are mixed evenly and added to the crushed kitchen waste for mixing.

[0050] (3) The conditioning agent used is sawdust, and the dosage is 15wt% of the mass of the crushed kitchen waste used. The conditioning agent sawdust is added to the crushed kitchen waste and mixed evenly. The initial moisture content is adjusted to about 60%, and a 60-mesh nylon filter is used to hold it and load it into a biological drying device.

[0051] (4) Use an aeration pump for continuous aeration and use a flow meter to quantitatively control the ventilation volume, adjusting the ventilation rate to 1 L kg -1 ·min -1 The frequency of turning the compost during the biological drying process (once a day) was set, and the moisture content of the material was tested by sampling every 24 hours, and the device and the material (placed in a 60-mesh sieve) were weighed.

[0052] (5) The stack is heated externally at 37°C, and the stack generates its own heat. When the temperature reaches 42°C, it is maintained for 1-2 hours, and the heat assistance to the stack is stopped;

[0053] (6) After 72 hours, the temperature has dropped below 40°C, and then the external heating at 37°C is restarted to improve the enzyme activity, microbial activity and bio-drying effect through the external heat source;

[0054] (7) When the moisture content is lower than 40%, the material can be discharged. 100g of the discharged material is used as recycling material. Repeat steps 1-7 for long-term operation.

[0055] (8) In the embodiment of the present invention, the moisture content of the output of the enzyme-thermal biological drying with heating at both ends is similar to that of the output of the enzyme-thermal biological drying with heating throughout the process. Figure 3 and Figure 4 It can be seen that both are below 40%, and the moisture removal rate is also similar, at around 70%, but the energy consumption of heating at both ends is less than 1 / 2 of that of heating throughout the process, which greatly saves energy.

[0056] Figure 2 The structure of the biological drying device of the present invention is shown, which mainly includes a biological drying chamber 13 and a leachate collection chamber 14. The two chambers can be independent or isolated in a container. The biological drying chamber 13 is located above the leachate collection chamber 14, and the two are separated by a porous filter plate 3. The pore size of the porous filter plate is preferably about 5 mm. The volume ratio of the leachate collection chamber 14 to the biological drying chamber 13 is preferably 1:9 to 1:4.

[0057] The biological drying bin 13 is connected with a compound enzyme dosing device, a bacterial agent dosing device and a conditioning agent dosing device, which are used to respectively add compound enzymes, bacterial agents and conditioning agents to the kitchen waste therein.

[0058] Dry air is introduced into the side wall of the leachate collection chamber 14, and the dry air can be generated by the air pump 1 and the drying bottle 2, and the flow rate is controlled by the flow meter 6. After the air is introduced into the drying bottle 2 through the air pump 1 and dried, it is adjusted by the flow meter 6, enters the upper part of the leachate collection chamber 14 through the air inlet 12, and then enters the biological drying chamber 13 through the porous filter plate 3. After the air is dried by the drying bottle 2, the water carrying capacity of the air is enhanced.

[0059] A water-absorbing sponge 7 is arranged on the top of the biological drying bin 13. The water-absorbing material 7 can be a sponge to prevent the condensed water from flowing back. There is a space between the water-absorbing sponge 7 and the materials in the bin. The gas outlet pipe 16 of the biological drying bin 13 passes through the water-absorbing sponge 7 to connect the space with the space outside the bin. For gas collection and detection, the gas outlet pipe 16 can be connected to the serpentine condenser 10 in the space outside the bin. The gas outlet through the serpentine condenser 10 enters the gas collecting bottle 4 again. The gas outlet of the gas collecting bottle 4 passes through an auxiliary drying bottle 17 and is discharged.

[0060] A heating belt 11 is arranged around the biological drying bin 13 to provide the auxiliary heating. A temperature recorder 5 is arranged in the biological drying bin 13 to monitor the temperature. A stirring device is arranged in the biological drying bin 13 to realize the turning of the compost. Furthermore, the wall of the biological drying bin 13 is an organic glass interlayer 15, which is a double-layer hollow glass, with an air layer 8 in the middle, which plays a role in slowing down the heat loss. A heating belt 11 is placed on the outer wall, and a layer of heat preservation cotton 9 is wrapped on the heating belt 11. The air carrying water vapor leaves the biological drying bin 13 through the air outlet 16, and after condensation by the serpentine condenser 10, the condensed water enters the collection bottle 4, and the condensed gas passes through the auxiliary drying bottle 17 and is discharged into the air.

[0061] Furthermore, the biological drying bin 13 contains a nylon filter of 60 mesh of equal size, which plays the role of uniform air intake and convenient material loading and unloading, and the kitchen waste is put into the filter to form a pile.

[0062] In summary, the present invention can control the entire biological drying and reduction process within 3-4 days, can operate when the moisture content of kitchen waste is 55-65%, and the moisture content of the output can be reduced to about 30%. The method can reduce the difficulty and cost of garbage collection and transportation, reduce secondary pollution in the garbage collection and transportation process, improve the living environment of residents and the appearance of the city, increase the resource recovery rate, and has the characteristics of short cycle, high efficiency and low energy consumption. At the same time, the reduced product can be processed as a resource in the later stage, generating greater environmental and economic benefits.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An enzyme-heat combined enhanced kitchen waste bio-drying device, characterized in that: The invention comprises a biological drying bin (13) and a leachate collecting bin (14), wherein the biological drying bin (13) is located above the leachate collecting bin (14), and the two are separated by a porous filter plate (3); the biological drying bin (13) is connected to a composite enzyme dosing device, a microbial agent dosing device and a conditioner dosing device; dry air is introduced into the side wall of the leachate collecting bin (14); a water-absorbing sponge (7) is arranged on the top of the biological drying bin (13); a space is provided between the water-absorbing sponge (7) and the material in the bin; an air outlet pipe (16) of the biological drying bin (13) passes through the water-absorbing sponge (7) to connect the space with the space outside the bin; a heating belt (11) is arranged on the outer wall of the biological drying bin (13) and wrapped with a heat-insulating layer (9); a temperature recorder (5) and a stirring device are arranged in the biological drying bin (13).

2. The enzyme-heat combined enhanced kitchen waste bio-drying device according to claim 1, characterized in that: The composite enzyme dosing device consists of a mixer and an enzyme dosing device, wherein the enzyme dosing device includes a carbohydrase dosing device, a protease dosing device and a lipase dosing device, the outlet of the enzyme dosing device is connected to the mixer, and the outlet of the mixer is connected to the biological drying bin (13).

3. The enzyme-heat combined enhanced kitchen waste bio-drying device according to claim 1, characterized in that: An air inlet (12) is provided at the upper middle portion of the side wall of the leachate collection bin (14), and the air inlet (12) is connected to a dry air generating device, which comprises an air pump (1), a drying bottle (2) and a flow meter (6).

4. The enzyme-heat combined enhanced kitchen waste bio-drying device according to claim 1, characterized in that: The wall of the biological drying bin (13) is an organic glass interlayer (15), the organic glass interlayer (15) is a hollow double-layer glass structure, the hollow layer is an air layer (8), and the outer wall of the organic glass interlayer (15) is provided with a heating belt (11) and wrapped with an insulation layer (9).

5. The enzyme-heat combined enhanced kitchen waste bio-drying device according to claim 1, characterized in that: The pore size of the porous filter plate (3) is d, and d is the upper limit of the particle size of the kitchen waste in the biological drying bin (13) after being crushed.

6. The enzyme-heat combined enhanced kitchen waste bio-drying device according to claim 1, characterized in that: The biological drying bin (13) contains a nylon filter screen of equal size and 60 meshes, and kitchen waste is put into the filter screen to form a pile.

7. The enzyme-heat combined enhanced kitchen waste bio-drying device according to claim 1, characterized in that: The gas outlet pipe (16) is connected to the serpentine condenser (10) outside the biological drying bin (13), and the serpentine condenser (10) is connected to the gas collecting bottle (4).

8. The enzyme-heat combined enhanced kitchen waste bio-drying device according to claim 1, characterized in that: The heating belt (11) is heated by a resistance wire and is evenly wound around the outer wall of the biological drying bin (13). The heating temperature is 30-37°C.

9. The enzyme-heat combined enhanced kitchen waste bio-drying device according to claim 1, characterized in that: The temperature recorder (5) and the heating belt (11) are connected to a heating controller. When the temperature of the temperature recorder (5) is higher than 40°C for the first time, the heating controller controls the heating belt (11) to stop heating after 1 to 2 hours, and restarts heating when the temperature of the temperature recorder (5) is lower than 40°C.

10. The enzyme-heat combined enhanced kitchen waste bio-drying device according to claim 1, characterized in that: The volume ratio of the leachate collection bin (14) to the biological drying bin (13) is 1:9 to 1:4.

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