A distributed biochemical treatment system for kitchen waste

Abstract

The present invention belongs to the technical field of food waste treatment, and discloses a distributed food waste biochemical treatment system. The distributed food waste biochemical treatment system includes a waste treatment system, which includes a garbage temporary storage device, a drying and dehydration device, and a biochemical fermentation device connected in sequence, and the drying and dehydration device is configured to dry and dehydrate the food waste to a preset value through a steam recompression technology. Among them, the distributed food waste biochemical treatment system also includes a condensed water pipeline connected to the drying and dehydration device, the biochemical fermentation device, and the garbage temporary storage device in sequence, so that the condensed water generated in the drying and dehydration device can be discharged after passing through the biochemical fermentation device and the garbage temporary storage device in sequence, so as to realize the waste heat recovery of the condensed water. The distributed food waste biochemical treatment system of the present invention enables the food waste to meet the conditions required for biochemical treatment during biochemical treatment, and can also effectively reduce the energy consumption of the system and save energy.

Description

Technical Field

[0001] The invention belongs to the technical field of restaurant kitchen waste treatment, and in particular relates to a distributed restaurant kitchen waste biochemical treatment system. Background Art

[0002] The composition of food waste is complex, mainly organic substances such as starch, food fiber and animal fat, with high water content, easy to rot and produce stench, so it is difficult to treat. According to the characteristics of food waste, biodegradation treatment (i.e. biochemical treatment) after necessary pretreatment is a better treatment method. Biochemical treatment has two methods: aerobic fermentation and anaerobic fermentation. Aerobic can generally produce organic fertilizer, and anaerobic can generally produce biogas. For centralized large-scale food waste treatment, anaerobic fermentation is more commonly used, and the biogas produced can be further utilized as a resource. Since the sources of food waste are relatively scattered, centralized treatment will inevitably bring higher transportation costs, and will also cause secondary spillage during transportation. Therefore, distributed on-site treatment is sometimes a better choice. Distributed treatment generally sets up treatment sites near the source of food waste, many of which are in areas with dense population. Therefore, first of all, it requires high waste treatment efficiency, low energy consumption, safety and reliability; secondly, it requires small footprint and no secondary pollution; thirdly, since there are generally few operators at the sites, the treatment process is required to be simple and easy to operate. Since traditional biochemical treatment methods, whether anaerobic or aerobic, have problems such as long treatment time and complex process, and anaerobic treatment will also produce flammable and explosive biogas, which is highly dangerous, traditional biochemical treatment is not suitable for the treatment of distributed food waste.

[0003] At present, conventional aerobic biochemical treatment is carried out in the equipment, which is equipped with mechanical stirring, forced heating and ventilation. Its biggest feature is the fast processing speed (generally 1 to 3 days of residence time). Due to the short residence time, the equipment occupies a small area. For slightly larger-scale equipment (such as processing capacity> 2 tons / day), the process is generally to crush first and then mechanically squeeze and dehydrate. After dehydration, the material enters the biochemical warehouse for aerobic biochemical treatment, and the sewage enters the water treatment system.

[0004] However, in the prior art, due to the complex composition of food waste, the moisture content of the material after mechanical dehydration can generally still reach 65-70%, while the suitable moisture content for aerobic treatment is 50-60%. Therefore, the material after mechanical dehydration is easy to form an anaerobic environment in the biochemical equipment, and aerobic degradation is difficult, resulting in the inability to meet the conditions required for suitable biochemical treatment. In addition, due to the short biochemical treatment time (generally <72 hours), it is impossible to effectively reduce the moisture content in the food waste, and it is also impossible to effectively kill the viruses, pathogens and pathogenic microorganisms that may be generated during the storage of the food waste, resulting in the presence of harmful substances after the food waste is treated. In addition, the steam of the material after dehydration is usually directly discharged to the exhaust gas treatment system, thereby wasting the waste heat in the steam and causing a waste of usable energy. Summary of the invention

[0005] In order to solve all or part of the above problems, the purpose of the present invention is to provide a distributed food waste biochemical treatment system so that the food waste can meet the conditions required for biochemical treatment, while also being able to effectively reduce the energy consumption of the system and save energy.

[0006] The distributed biochemical treatment system for food waste includes a garbage treatment system for pre-treatment and aerobic fermentation of food waste, the garbage treatment system includes a garbage temporary storage device, a drying and dehydration device and a biochemical fermentation device connected in sequence, the garbage temporary storage device is used for temporary storage of food waste, the drying and dehydration device is configured to dry and dehydrate the food waste to a preset value through steam recompression technology, and the biochemical fermentation device is used to aerobic biochemical fermentation treatment of the food waste and discharge it to the outside. Among them, the distributed biochemical treatment system for food waste also includes a condensed water pipeline connected to the drying and dehydration device, the biochemical fermentation device and the garbage temporary storage device in sequence, so that the condensed water generated in the drying and dehydration device can be discharged after passing through the biochemical fermentation device and the garbage temporary storage device in sequence, so as to realize the waste heat recovery of the condensed water.

[0007] Furthermore, the drying and dehydration device includes a vacuum dryer, which includes a sealed shell with a steam jacket, a first gas-liquid separator and a steam compressor, a feed port, a discharge port, a dryer condensate return port and a steam outlet are formed on the sealed shell, a steam inlet and a dryer condensate outlet are formed on the steam jacket, wherein the steam outlet, the gas inlet of the first gas-liquid separator, the steam compressor and the steam inlet are connected in sequence, the liquid outlet of the first gas-liquid separator is connected to the dryer condensate return port, and the dryer condensate outlet is connected to the condensate inlet of the biochemical fermentation device through a condensate pipe.

[0008] Furthermore, the drying and dehydration device also includes a second gas-liquid separator and a condensate pump. The condensate outlet of the dryer, the second gas-liquid separator, and the condensate pump are connected in sequence and connected to the condensate inlet of the biochemical fermentation device through a condensate pipeline.

[0009] Furthermore, the biochemical fermentation device includes a biochemical bin and a waste heat recovery device, the biochemical bin includes a bin body, an air inlet pipe, and an exhaust pipe, the waste heat recovery device includes an evaporator heat exchange side and a condenser heat exchange side, the air inlet pipe is connected to the condenser heat exchange side, the exhaust pipe is connected to the evaporator heat exchange side, the lower part of the bin body is arc-shaped, the arc-shaped part of the bin body is provided with a condensate jacket, the condensate jacket is provided with a biochemical bin condensate inlet and a biochemical bin condensate outlet, wherein the biochemical bin condensate inlet is connected to the condensate pump of the drying and dehydration device through a condensate pipe to receive condensate from the drying and dehydration device.

[0010] Furthermore, the biochemical fermentation device also includes an air collecting box assembly and a fine filtering device arranged outside the wall panel of the warehouse body, and an exhaust hole connected to the air collecting box assembly is opened on the wall panel. An exhaust pipe is formed on the air collecting box assembly, and the exhaust pipe is connected to the fine filtering device to discharge the exhaust gas in the warehouse body into the waste heat recovery device through the fine filtering device, wherein the fine filtering device uses a multi-stage filter to filter and remove dust from the exhaust gas.

[0011] Furthermore, the garbage temporary storage device includes a shell and an inner coil arranged in the shell, and a feed port and a discharge port are formed on the shell. One end of the inner coil is connected to the condensate outlet of the biochemical bin through a condensate pipe, and the other end is used to be connected to the wastewater treatment system.

[0012] Furthermore, the distributed biochemical treatment system for food waste also includes a wastewater treatment system, which includes a grease trap and a biological treatment tank, wherein the grease trap is connected to the water outlet of the inner coil to receive condensed water in the inner coil, and the floating oil separated by the condensed water in the grease trap is discharged into the drying and dehydration device for treatment, and the wastewater in the grease trap is discharged into the biological tank for biochemical treatment to meet the wastewater discharge standards.

[0013] Furthermore, the distributed food waste biochemical treatment system also includes a waste gas treatment system, which includes a water washing unit, a photolysis unit and an activated carbon adsorption unit. The waste gas discharged from the biochemical fermentation device passes through the water washing unit, the photolysis unit and the activated carbon adsorption unit in sequence to meet the waste gas emission requirements.

[0014] Furthermore, each of the garbage temporary storage device, the drying and dehydration device, the biochemical fermentation device, the wastewater treatment system and the waste gas treatment system is constructed in the form of a skid.

[0015] Furthermore, the vacuum dryer is selected from one of a vacuum disc type, a vacuum paddle type or a vacuum rake type dryer, and the steam compressor is a Roots compressor or a piston compressor.

[0016] The distributed kitchen waste biochemical treatment system of the present invention has the following advantages:

[0017] 1) The distributed food waste biochemical treatment system of the present invention realizes drying and dehydration of food waste through steam recompression technology. On the one hand, the evaporated water is very clean, which greatly reduces the burden of wastewater treatment; on the other hand, drying and dehydration realizes the control of the moisture content of the food waste output, and the moisture content of the material entering the biochemical bin is reduced accordingly, and mixed with the material with high moisture content after biochemical degradation, so that the food waste in the biochemical bin can always maintain a relatively ideal moisture content for biochemical treatment, thereby facilitating the biochemical treatment of food waste;

[0018] 2) The distributed food waste biochemical treatment system of the present invention can effectively ensure the treatment effect of biochemical fermentation by fermenting the dried and dehydrated food waste in the biochemical fermentation device, so that the food waste fermented in the biochemical fermentation device can effectively avoid the generation of harmful substances such as viruses, pathogenic bacteria and pathogenic microorganisms, so that the food waste can effectively meet its discharge requirements;

[0019] 3) The condensed water generated by the steam recompression technology of the distributed food waste biochemical treatment system of the present invention can also be discharged through the condensed water pipeline after passing through the biochemical fermentation device and the garbage temporary storage device in sequence, so as to realize the waste heat recovery of the condensed water, greatly saving energy consumption and avoiding the waste of heat energy;

[0020] 4) Each device of the distributed biochemical treatment system for food waste of the present invention is in the form of a skid. In this way, on the one hand, the skid form can meet the various needs of customers; on the other hand, it can make the entire system equipment of the distributed biochemical treatment system for food waste of the present invention compact, save space, and reduce on-site construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a system flow chart of a distributed biochemical treatment system for food waste according to an embodiment of the present invention;

[0022] Figure 2 It is a structural schematic diagram of a drying and dehydrating device according to an embodiment of the present invention;

[0023] Figure 3 A schematic diagram of the structure of a biochemical fermentation device according to an embodiment of the present invention;

[0024] Figure 4 for Figure 3 A view of the biochemical fermentation device shown along the AA direction;

[0025] Figure 5 for Figure 3 A schematic diagram of the structure of the exhaust pipe shown;

[0026] Figure 6 Schematic diagram of the structure of the biological treatment tank according to an embodiment of the present invention. DETAILED DESCRIPTION

[0027] In order to better understand the purpose, structure and function of the present invention, a distributed biochemical treatment system for food waste of the present invention is further described in detail below in conjunction with the accompanying drawings.

[0028] Figure 1 FIG. 1 shows a system flow chart of a distributed food waste biochemical treatment system 100 according to an embodiment of the present invention. Figure 1 As shown, the distributed biochemical treatment system 100 for food waste includes a garbage treatment system for pre-treatment and aerobic fermentation of food waste, and the garbage treatment system includes a garbage temporary storage device, a drying and dehydration device, and a biochemical fermentation device connected in sequence, the garbage temporary storage device is used for temporary storage of food waste, the drying and dehydration device is configured to dry and dehydrate the food waste to a preset value through steam recompression technology, and the biochemical fermentation device is used to aerobic biochemical fermentation treatment of the food waste and discharge it to the outside. Among them, the distributed biochemical treatment system 100 for food waste also includes a condensed water pipeline connected in sequence to the drying and dehydration device, the biochemical fermentation device, and the garbage temporary storage device, so that the condensed water generated in the drying and dehydration device can be discharged after passing through the biochemical fermentation device and the garbage temporary storage device in sequence, so as to realize the waste heat recovery of the condensed water.

[0029] The distributed food waste biochemical treatment system 100 of the embodiment of the present invention includes three systems: a garbage treatment system, a wastewater treatment system, and a waste gas treatment system. The garbage treatment system includes two units: garbage pretreatment and garbage biochemical treatment, so as to make the garbage harmless, reduced, and resource-based. When the distributed food waste biochemical treatment system 100 of the embodiment of the present invention is in use, the food waste is pretreated by the garbage treatment system, specifically including raw material lifting and weighing, sorting, garbage crushing, and temporary storage of garbage. The raw material lifting and weighing uses a garbage elevator to lift the food waste to the sorting platform. The garbage elevator is equipped with a weighing module. While lifting, the food waste is weighed and uploaded to the control system of the distributed food waste biochemical treatment system 100. Sorting is to sort the inorganic food waste that cannot be biodegraded manually or mechanically on the sorting platform. The sorted food waste enters the garbage crusher for crushing. The crushing can be a shearing crusher. The crushing particle size can be less than 10mm. The purpose of crushing is to make the food waste easier to dry, dehydrate, and biodegrade. The crushed materials are stored in the temporary garbage storage device.

[0030] The above-mentioned entire treatment is the treatment of the food waste before drying and dehydration, and the pre-treatment can be used to treat the waste into a relatively uniform slurry. The food waste after pre-treatment is then dried and dehydrated by a drying and dehydrating device, and the drying and dehydrating device is configured to achieve drying and dehydration of the food waste through steam recompression technology (MVR process), so that each batch of food waste can be dried and dehydrated to a preset value through the rational design of the drying and dehydrating device and a certain operating time. The preset value can be set to a moisture content of 50-60% for each batch of food waste, so as to achieve the optimal moisture content requirement for aerobic biological treatment. At the same time, the condensed water generated by the steam recompression technology can also be discharged after passing through the biochemical fermentation device and the garbage temporary storage device in sequence through the condensed water pipeline to achieve waste heat recovery of the condensed water.

[0031] Through the above configuration, the distributed food waste biochemical treatment system 100 of the embodiment of the present invention has the following advantages:

[0032] 1) The distributed food waste biochemical treatment system 100 of the embodiment of the present invention realizes drying and dehydration of food waste through steam recompression technology (MVR process), which can meet the optimal moisture content requirement of aerobic biological treatment. At the same time, the condensed water generated by the steam recompression technology can also be discharged after passing through the biochemical fermentation device and the garbage temporary storage device in sequence through the condensed water pipeline, so as to realize the waste heat recovery of the condensed water, greatly save energy consumption, and avoid the waste of heat energy;

[0033] 2) The distributed food waste biochemical treatment system 100 of the embodiment of the present invention can effectively ensure the treatment effect of biochemical fermentation by fermenting the dried and dehydrated food waste through the biochemical fermentation device, so that the food waste after fermentation by the biochemical fermentation device can effectively avoid the production of harmful substances such as viruses, pathogenic bacteria and pathogenic microorganisms, so that the food waste can effectively meet its discharge requirements.

[0034] Figure 2 FIG. 1 is a schematic diagram showing the structure of a drying and dehydrating device 10 according to an embodiment of the present invention. Figure 2 As shown, the drying and dehydrating device 10 may include a vacuum dryer 1, and the vacuum dryer 1 may include a sealed shell 12 with a steam jacket 11, a first gas-liquid separator 13 and a steam compressor 14. The sealed shell 12 is formed with a feed inlet 121, a discharge port 122, a dryer condensate return port 123 and a steam outlet 124, and the steam jacket 11 is formed with a steam inlet 111 and a dryer condensate outlet 112. Among them, the steam outlet 124, the gas inlet of the first gas-liquid separator 13, the steam compressor 14 and the steam inlet 111 are connected in sequence, the liquid outlet of the first gas-liquid separator 13 is connected to the dryer condensate return port 123, and the dryer condensate outlet 112 is connected to the biochemical fermentation device 20 (combined with Figure 3 The condensate inlet is connected to the condensate inlet of FIG.

[0035] When the drying and dehydrating device 10 according to the embodiment of the present invention is in use, the food waste enters the sealed shell 12 of the vacuum dryer 1 from the feed port 121 in batches. When the steam compressor 14 continues to work, the sealed shell 12 is evacuated to a negative pressure (about -40 kPa). Under this negative pressure, the boiling point temperature of the water on the food waste changes to about 85°C. The food waste is heated by a heating device (not shown in the figure) so that the water in it is flashed into steam when it reaches this temperature. The steam is discharged into the first gas-liquid separator 13 through the steam outlet 124. Under the action of the steam compressor 14, a large amount of steam is compressed and heated and then discharged into the steam inlet 111 to enter the steam jacket 11 to heat the food waste, so that the water in the food waste evaporates when it reaches the boiling point temperature, thereby realizing continuous circulation. The steam in the steam jacket 11 after heat exchange is liquefied into condensed water, which is discharged from the dryer condensed water outlet 112 through the condensed water pipeline to the condensed water inlet of the biochemical fermentation device 20.

[0036] Through the above arrangement, the drying and dehydrating device 10 of the embodiment of the present invention can make the moisture content of the food waste gradually decrease after continuous evaporation and drying, and can judge the moisture content of the material after drying by calculating the determined drying time or the weight change of the whole device weighing (a weighing module needs to be installed), and when the moisture content required for biochemical treatment (50-60%) is reached, the material is discharged into the biochemical fermentation device 20 through the discharge port 122. Since the drying and dehydrating device 10 of the embodiment of the present invention adopts the steam compression heating method to dry the waste, during the drying and dehydrating process of the entire food waste, only the heating device is used at the beginning and electricity is used when the steam compressor 14 is started, and no external steam and other energy sources are required, so that the drying and dehydrating device 10 of the embodiment of the present invention can effectively utilize the original waste steam, thereby recovering latent heat and improving thermal efficiency. In addition, the drying and dehydration device 10 of the embodiment of the present invention also realizes waste heat recovery of condensed water by liquefying the steam in the steam jacket 11 after heat exchange into condensed water and discharging it into the biochemical fermentation device 20 through the dryer condensed water outlet 112, thereby greatly saving energy consumption and avoiding waste of heat energy.

[0037] According to statistics, the drying and dehydrating device 10 of the embodiment of the present invention is expected to consume 120-150 kwh of comprehensive electricity to evaporate one ton of water, which is about 20% of direct electric heating, so that the drying and dehydrating device 10 of the embodiment of the present invention has obvious energy-saving effect.

[0038] Preferably, if Figure 2As shown, the drying and dehydration device 10 may also include a second gas-liquid separator 15 and a condensate pump 16. The dryer condensate outlet 112, the second gas-liquid separator 15, and the condensate pump 16 are connected in sequence and connected to the condensate inlet of the biochemical fermentation device 20 through a condensate pipe.

[0039] Preferably, the vacuum dryer 1 can be selected from one of a vacuum disc type, a vacuum paddle type or a vacuum rake type dryer. The steam compressor 14 can be a Roots compressor or a piston compressor.

[0040] Figure 3 FIG. 2 shows a schematic diagram of the structure of a biochemical fermentation device 20 according to an embodiment of the present invention. Figure 3 As shown, the biochemical fermentation device 20 may include a biochemical warehouse 2 and a waste heat recovery device 3. The biochemical warehouse 2 may include a warehouse body 21, an air inlet pipe 22, and an exhaust pipe 23. The waste heat recovery device 3 includes an evaporator heat exchange side and a condenser heat exchange side. The air inlet pipe 22 is connected to the condenser heat exchange side, and the exhaust pipe 23 is connected to the evaporator heat exchange side. Figure 4 As shown, the lower part of the bin body 21 is arc-shaped, and a condensate jacket 24 is provided on the arc-shaped part of the bin body 21. The condensate jacket 24 is provided with a biochemical bin condensate inlet 241 and a biochemical bin condensate outlet 242. The biochemical bin condensate inlet 241 is connected to the condensate pump 16 of the drying and dehydration device 10 through a condensate pipeline to receive condensate from the drying and dehydration device 10.

[0041] The biochemical fermentation device 20 according to the embodiment of the present invention is provided with a condensate jacket 24 at the arc-shaped part of the bin body 21, and it is connected to the condensate pump 16 of the drying and dehydration device 10. In this way, it can be seen from the above that the condensate liquefied by the steam in the steam jacket 11 after heat exchange can be discharged into the condensate jacket 24 of the biochemical fermentation device 20 through the drying and dehydration device 10, so that the waste heat recovery of the condensate can be effectively realized. In addition, since the working temperature of the biochemical treatment is generally 50-60°C, when the biochemical fermentation device performs biochemical treatment on the food waste, the working temperature of the biochemical treatment can be effectively maintained, and at the same time, it can also help to better kill the viruses, pathogenic bacteria and pathogenic microorganisms that may be generated during the storage of the food waste. The waste heat recovery device 3 in this embodiment adopts heat pump technology, and can also convert the low-grade heat source in the waste gas into a high-grade heat source for heating the biochemical fermentation device 20, thereby realizing efficient recovery of waste gas heat and achieving the effect of energy saving and emission reduction.

[0042] Preferably, if Figure 3As shown, the waste heat recovery device 3 may include a heat pump circulation system connected by a compressor 31, a condenser 32, a throttle valve 33, and an evaporator 34 through pipelines. The waste gas generated by the biochemical fermentation device 20 is introduced into the heat pump circulation system and discharged after heat exchange. According to the present invention, when the waste heat recovery device 3 is in use, a heat pump working medium is arranged inside the heat pump circulation system, and the high-temperature waste gas generated by the biochemical fermentation device 20 is heat exchanged and cooled on the evaporator heat exchange side of the evaporator 34 and then divided into a waste gas path and a condensation water path through a gas-liquid separator. One path of the waste gas path forms circulating air and enters the condenser heat exchange side of the condenser 32, and the other path is discharged into the waste gas treatment system. The condensation water path is discharged into the wastewater treatment system. The temperature of the waste gas after heat exchange can reach 25°C. After heat exchange, the heat pump working medium becomes gaseous after isobaric evaporation and heat absorption in the evaporator 34, and enters the compressor 31 for isentropic compression into a high-temperature and high-pressure superheated gas. Then, the heat pump working fluid undergoes isobaric condensation and releases heat in the condenser 32, and exchanges heat to the circulating air. After the heat exchange, the circulating air can reach above 60°C and enter the biochemical warehouse 2 to heat the food waste. The heat pump working fluid that releases heat becomes a saturated liquid with high pressure and medium temperature, and then is throttled through the throttle valve 33 to become a mixture of saturated gas and saturated liquid with low temperature and low pressure, and then enters the evaporator 34 to absorb heat, and the purpose of heat recovery is achieved through repeated cycles. Since the biochemical biochemical warehouse 2 requires a certain amount of oxygen to be consumed, in order to ensure a certain supply of oxygen in the biochemical warehouse, there is always a small amount of incoming air in the waste heat recovery device 3 for supplementation, and the remaining air volume is used for circulating drying. Since the amount of supplemented air is small, the amount of exhaust gas discharged is also small, which greatly reduces the load of the subsequent deodorization equipment for deodorizing the exhaust gas.

[0043] Preferably, if Figure 3 As shown, the biochemical bin 2 may also include a stirring assembly 25 disposed in the bin body 21, and the stirring assembly 25 includes a stirrer 251, a stirring shaft 252, and a driving device 253. The stirrer 251 includes a stirring paddle 251a mounted on the stirring shaft 252, and one end of the stirring paddle 251a is equipped with a blade 251b, and the driving device 253 is connected to the stirring shaft 252 to drive the stirring shaft 252 to rotate. Among them, adjacent stirring paddles 251a are configured to be vertically cross-arranged. Through this arrangement, the stirring paddles 251a can alternately stir the food waste in the biochemical bin 2, so that the effect of the biochemical fermentation treatment of the food waste is better.

[0044] Also preferably, if Figure 3As shown, the biochemical fermentation device 20 may also include an air collecting box assembly 26 and a fine filtering device 4 arranged outside the wall panel of the warehouse body 21, and an exhaust hole connected to the air collecting box assembly 26 is opened on the wall panel, and an exhaust pipe 23 is formed on the air collecting box assembly 26, and the exhaust pipe 23 is connected to the fine filtering device 4 to discharge the exhaust gas in the warehouse body 21 into the waste heat recovery device 3 through the fine filtering device 4. Among them, the fine filtering device 4 uses a multi-stage filter to filter and remove dust from the exhaust gas. Through this arrangement, the exhaust gas discharged to the outside can be effectively filtered and dusted.

[0045] More preferably, if Figure 3 As shown, the fine filtering device 4 may include a three-stage filter 41 and a fan 42 to prevent gas impurities from clogging the waste heat recovery device 3, and also to prevent the final exhaust gas particulate matter content from exceeding the standard. Among them, the filter 41 can be a basket filter, and a filter mesh is provided in the filter 41. The filtering accuracy of each stage can be set to be different, that is, the number of filter meshes from the first stage to the last stage gradually increases, so that the accuracy of the filter 41 gradually increases. In addition, a differential pressure gauge 43 with a remote transmission function is provided before and after each stage of the filter 41. When the differential pressure is higher than the set value, it means that the filter 41 is clogged and needs to be cleaned.

[0046] Preferably, the biochemical fermentation device 20 may further include a temperature detector 27, a humidity detector 28 and an oxygen concentration monitor 29 disposed in the bin body 21. The temperature detector 27 and the humidity detector 28 are used to monitor the temperature and humidity in the bin body 21, respectively, and the oxygen concentration monitor 29 is used to monitor the oxygen content in the bin 21, so as to adjust the air intake according to the oxygen content value corresponding to the decomposition of the food waste.

[0047] Preferably, if Figure 4 As shown, the air inlet pipe 22 can be constructed as a pipe for taking air into the warehouse body 21, on which an air inlet port 221 and an air inlet slot are formed. After entering the warehouse body 21, the air inlet pipe 22 forms branches and is connected to a horizontal pipe 222, on which an air inlet slot is opened.

[0048] Preferably, if Figure 3 and Figure 5 As shown, the air collecting box assembly 26 may include: a filter screen 261 and an air collecting box 262 which are installed in combination outside the wall panel opposite to the feed port 201 of the silo body 21; the exhaust hole is constructed as a square hole of corresponding size connected to the air collecting box 262; an exhaust pipe 23 is installed on the air collecting box 262, and the exhaust gas in the silo body 21 is filtered through the filter screen 261 and then discharged through the exhaust pipe 23 through the corresponding closed installation; the filter screen 261 is a coarse filter with an opening diameter of 2 to 3 mm. It is also preferred that the filter screen 261 is detachable to facilitate its cleaning. The exhaust pipe 23 is provided with branches outside the silo, which are also connected to the air collecting box 262. Among them, Figure 3 Reference numeral 202 is a discharge port of the biochemical fermentation device 20 .

[0049] In a preferred embodiment, the garbage temporary storage device may include a shell (not shown in the figure) and an inner coil (not shown in the figure) disposed in the shell, a feed port and a discharge port are formed on the shell, one end of the inner coil is connected to the condensate outlet 242 of the biochemical bin through a condensate pipe, and the other end is used to connect to the wastewater treatment system. Through this arrangement, the condensate in the condensate jacket 24 of the biochemical fermentation device 20 can enter the garbage temporary storage device through the inner coil to preheat the garbage temporarily stored in the garbage temporary storage device, thereby further realizing the waste heat utilization. At the same time, this arrangement can also reduce the temperature of the wastewater discharged into the wastewater treatment system, thereby being more conducive to the subsequent treatment of the wastewater.

[0050] Back to Figure 1 Preferably, the distributed food waste biochemical treatment system 100 may also include a wastewater treatment system, and the wastewater treatment system may include an oil separator and a biological treatment tank. The oil separator is connected to the water outlet of the inner coil to receive the condensed water in the inner coil, and the floating oil separated by the oil separator is discharged into the drying and dehydration device 10 for treatment, and the wastewater in the oil separator is discharged into the biological treatment tank for biochemical treatment to meet the wastewater discharge standard. Specifically, in combination with the above, it can be seen that the wastewater treated by the wastewater treatment system according to the present invention is condensed water generated by garbage pretreatment. The condensed water cooled in the condensed water jacket 24 of the biochemical bin 2 and the inner coil of the garbage temporary storage device is discharged into the oil separator, and at this time, the temperature of the condensed water can be reduced from the initial about 90°C to 30-40°C. Since the wastewater is produced by evaporation, it is already very clean, usually with a chemical oxygen demand (COD) of less than 5000mg / L, no solid particles, and only a trace of oil, so the wastewater is relatively easy to treat. The wastewater enters the biological treatment tank and uses the biological rotary disc treatment technology with high-efficiency fillers and bottom aeration to further reduce the COD in the wastewater so that the wastewater can finally meet the purpose of meeting the discharge standards.

[0051] Figure 6 FIG. 5 shows a schematic diagram of the structure of a biological treatment tank 50 according to an embodiment of the present invention. Figure 6 As shown, the biological treatment tank 50 may include a biological tank 51, a biological turntable 52, and a turntable motor 53. The biological tank 51 is provided with a water inlet 511 and a water outlet 512. Figure 6As shown, the biological turntable 52 is installed on the upper part of the biological tank 51, and can be reciprocated and rotated slowly under the drive of the turntable motor 53. The disk shaft of the biological turntable 52 is higher than the water surface, and about 40% of the disk surface of the biological turntable 52 is immersed in water, and about 60% is exposed to the air. The turntable of the biological turntable 52 is filled with fillers. Wastewater enters through the water inlet 511, and the disk shaft rotates under the drive of the turntable motor 53. The disk surface of the biological turntable 52 is alternately in contact with the wastewater and the air. The disk surface and fillers of the biological turntable 52 are covered by a film formed by the growth of microorganisms. The biological film alternately contacts the wastewater and the air, and continuously obtains pollutants and oxygen, thereby achieving the function of purifying wastewater. Shear stress is generated between the membrane and the disk surface due to rotation. As the thickness of the membrane increases, the weight increases. After a certain degree, the membrane falls off from the disk surface and flows away with the water.

[0052] Back to Figure 1 Preferably, the distributed food waste biochemical treatment system 100 may also include a waste gas treatment system, which may include a water washing unit, a photolysis unit, and an activated carbon adsorption unit. The waste gas discharged from the biochemical fermentation device 20 passes through the water washing unit, the photolysis unit, and the activated carbon adsorption unit in sequence to meet the waste gas emission requirements. Gas treatment uses the "water washing + UV photolysis + activated carbon adsorption" technology to purify and deodorize the gas to achieve the purpose of meeting emission standards.

[0053] The waste gas received by the waste gas treatment system according to the present invention is mainly air and water vapor, and contains certain odor components, usually mainly ammonia, followed by trace amounts of carbon disulfide. If the stirring and ventilation are not ideal, hydrogen sulfide may be produced in an anaerobic environment. In addition to the above gas components, there may be other trace amounts of odor components. Ammonia is a gas that is very soluble in water, and hydrogen sulfide is a gas that is soluble in water. The waste gas treatment system of the embodiment of the present invention adopts the method of "water washing + UV photolysis + activated carbon adsorption" for deodorization. The water washing is carried out in the water washing tower, which can remove most of the ammonia and part of the hydrogen sulfide. The unremoved ammonia, hydrogen sulfide, carbon disulfide and other components enter the UV photolysis device. The UV photolysis device is equipped with a UV lamp tube, which can release a high-energy UV ultraviolet light beam. On the one hand, this light beam can break the chemical bonds of the waste gas components to form free atoms or groups, and on the other hand, it can decompose the oxygen in the waste gas, and then combine to produce ozone. Ozone participates in the reaction, so that the odor components are finally decomposed and oxidized into simple stable compounds. After the waste gas passes through the UV photolysis equipment, it may still contain a very small amount of odor components. Finally, it is treated with activated carbon adsorption. The activated carbon box contains activated carbon, which can absorb the remaining odor components by relying on its strong specific surface area. After the above treatment, the waste gas can achieve the purpose of meeting the emission standards.

[0054] In a preferred embodiment, each module of the garbage temporary storage device, the drying and dehydration device 10, the biochemical fermentation device 20, the wastewater treatment system and the waste gas treatment system can be constructed in the form of a skid. It should be noted that the skid form can be understood as a series of customization from design to production and installation according to user requirements. Through this setting, on the one hand, the skid form can meet the various needs of customers; on the other hand, it can make the entire system equipment of the distributed food and kitchen waste biochemical treatment system 100 of the embodiment of the present invention compact, save space, and reduce on-site construction. For example, the garbage temporary storage device, the drying and dehydration device 10, and the biochemical fermentation device 20 of the garbage treatment system can be separately assembled in the factory in the form of a skid. Among them, the skid can include all the facilities required for the process such as equipment, pipelines, electrical, and instruments. There is no need to install the system internally on site. It is only necessary to install the inlet and outlet pipes and cables after the equipment is in place.

[0055] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by those skilled in the art to which the present invention belongs.

[0056] In addition, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the present invention, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0057] 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 them; 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 replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A distributed biochemical treatment system for kitchen waste, characterized in that: A garbage treatment system for pre-treating and aerobic fermentation of food waste is included, the garbage treatment system includes a garbage temporary storage device, a drying and dehydration device, and a biochemical fermentation device connected in sequence, the garbage temporary storage device is used for temporarily storing food waste, the drying and dehydration device is configured to dry and dehydrate the food waste to a preset value through a steam recompression technology, and the biochemical fermentation device is used to aerobic biochemical fermentation treatment of the food waste and discharge it to the outside, wherein the distributed food waste biochemical treatment system also includes a condensed water pipeline sequentially connected to the drying and dehydration device, the biochemical fermentation device, and the garbage temporary storage device, so that the condensed water generated in the drying and dehydration device can be discharged after passing through the biochemical fermentation device and the garbage temporary storage device in sequence, so as to realize the waste heat recovery of the condensed water; The drying and dehydration device comprises a vacuum dryer, and the vacuum dryer comprises a sealed shell with a steam jacket, a first gas-liquid separator and a steam compressor, wherein a feed port, a discharge port, a dryer condensate return port and a steam outlet are formed on the sealed shell, and a steam inlet and a dryer condensate outlet are formed on the steam jacket, wherein the steam outlet, the gas inlet of the first gas-liquid separator, the steam compressor and the steam inlet are connected in sequence, the liquid outlet of the first gas-liquid separator is connected to the dryer condensate return port, and the dryer condensate outlet is connected to the condensate inlet of the biochemical fermentation device through the condensate pipeline; The drying and dehydration device further comprises a second gas-liquid separator and a condensate pump, wherein the condensate outlet of the dryer, the second gas-liquid separator and the condensate pump are connected in sequence and connected to the condensate inlet of the biochemical fermentation device through the condensate pipeline; The biochemical fermentation device comprises a biochemical bin and a waste heat recovery device, the biochemical bin comprises a bin body, an air inlet pipe, and an exhaust pipe, the waste heat recovery device comprises an evaporator heat exchange side and a condenser heat exchange side, the air inlet pipe is connected to the condenser heat exchange side, the exhaust pipe is connected to the evaporator heat exchange side, the lower part of the bin body is arc-shaped, the arc-shaped part of the bin body is provided with a condensate jacket, the condensate jacket is provided with a biochemical bin condensate inlet and a biochemical bin condensate outlet, wherein the biochemical bin condensate inlet is connected to the condensate pump of the drying and dehydration device through the condensate pipeline to receive condensate from the drying and dehydration device; The biochemical fermentation device also includes an air collecting box assembly and a fine filtering device arranged outside the wall panel of the warehouse body, an exhaust hole connected to the air collecting box assembly is opened on the wall panel, an exhaust pipe is formed on the air collecting box assembly, and the exhaust pipe is connected to the fine filtering device to discharge the exhaust gas in the warehouse body into the waste heat recovery device through the fine filtering device, wherein the fine filtering device uses a multi-stage filter to filter and remove dust from the exhaust gas; The garbage temporary storage device includes a shell and an inner coil arranged in the shell, and a feed port and a discharge port are formed on the shell. One end of the inner coil is connected to the condensate outlet of the biochemical bin through the condensate pipe, and the other end is used to be connected to the wastewater treatment system.

2. The distributed biochemical treatment system for kitchen waste according to claim 1 is characterized in that: The distributed biochemical treatment system for food waste also includes a wastewater treatment system, which includes an oil separator and a biological treatment tank, wherein the oil separator is connected to the water outlet of the inner coil to receive condensed water in the inner coil, and the floating oil separated by the oil separator from the condensed water is discharged into the drying and dehydration device for treatment, and the wastewater in the oil separator is discharged into the biological tank for biochemical treatment to meet the wastewater discharge standards.

3. The distributed biochemical treatment system for kitchen waste according to claim 2 is characterized in that: The distributed food waste biochemical treatment system also includes a waste gas treatment system, which includes a water washing unit, a photolysis unit and an activated carbon adsorption unit. The waste gas discharged from the biochemical fermentation device passes through the water washing unit, the photolysis unit and the activated carbon adsorption unit in sequence to meet the waste gas emission requirements.

4. The distributed food waste biochemical treatment system according to claim 3 is characterized in that: Each of the garbage temporary storage device, the drying and dehydration device, the biochemical fermentation device, the wastewater treatment system and the waste gas treatment system is constructed in the form of a skid.

5. The distributed kitchen waste biochemical treatment system according to any one of claims 2 to 4, characterized in that: The vacuum dryer is selected from one of a vacuum disc type, a vacuum blade type or a vacuum rake type dryer, and the steam compressor is a Roots compressor or a piston compressor.

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