Waste treatment plant and waste treatment method

Abstract

To reduce cost by preventing storage of excessive moisture.SOLUTION: A waste treatment plant comprises: an aerobic fermentation treatment drying device 121 that aerobically ferments and dries an aerobically fermented treatment article 100 including a waste 1 in a room into which air is introduced from the outside and from which the air is discharged to the outside to be maintained at negative pressure; an air plenum room 130 into which the air discharged from the aerobic fermentation treatment drying device 121 is input and from which the air reduced in moisture is output to the outside; and a biological deodorization device 140 that biologically deodorizes the air discharged from the air plenum room 130 through a bio-filter 142 including an aerobic microorganism and discharges it to the outside. The moisture (humidity) of the air discharged from the inside of a housing 121 of the aerobic fermentation treatment drying device 120 is reduced in the air plenum room 130, and then input to the biological deodorization device 140 to be discharged to the outside.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a waste treatment plant and waste treatment method for aerobic fermentation treatment of mixed waste such as food waste, paper, and plastic generated in homes, restaurants, Japanese restaurants, hotels, supermarkets, etc., and more particularly to a waste treatment plant and waste treatment method that can prevent the accumulation of excessive moisture and reduce costs. [Background technology]

[0002] Most household waste generated by homes, restaurants, hotels, supermarkets and other food service businesses, schools, and other establishments is separated and collected in several categories according to methods designated by local governments. Organic waste such as fresh vegetables, fruits, meat, and other food scraps is incinerated as combustible waste along with other combustible waste at incineration plants. However, in recent years, efforts have been made to reduce the amount of waste incinerated as much as possible by reusing food waste as a resource from an environmental perspective. For example, methods have been developed to compost food waste by fermenting and maturing it in an aerobic environment, and then recycling it as organic fertilizer.

[0003] Therefore, regarding waste recycling, Patent Document 1 introduces a municipal solid waste recycling plant characterized by comprising: a pre-treatment facility that separates waste into combustible and non-combustible materials; a mixing facility that mixes the combustible materials separated in the pre-treatment facility with wood materials and returned fermented material, which is a portion of the treated material that has undergone fermentation drying treatment, to form mixed waste; a fermentation unit that generates heat through aerobic fermentation to dry the mixed waste formed in the mixing facility; and a deodorization unit that deodorizes the air in the fermentation unit through aerobic fermentation. The deodorization unit of the fermentation drying facility generates condensed water when deodorizing the air in the fermentation unit, and the mixing facility is supplied with the condensed water generated in the deodorization unit of the fermentation drying facility, and the supplied condensed water is added to the mixed waste to adjust it to a predetermined moisture content. In this Patent Document 1, the recycling plant utilizes the heat generated during microbial fermentation to dry high-moisture waste such as food waste. [Prior art documents] [Patent Documents]

[0004] [Patent Document 1] Patent No. 5649697 [Overview of the project] [Problems that the invention aims to solve]

[0005] However, in the recycling plant described in Patent Document 1, there is a description that condensate is generated when the air in the fermentation unit is deodorized in the deodorization unit, and the condensate generated in the deodorization unit is added to the mixed waste and used in the fermentation drying equipment. As a result, it is difficult for the moisture (water vapor) evaporated from the waste such as food waste to be released into the atmosphere. Therefore, if the amount of waste to be processed is large, a large amount of moisture will be stored in the plant, and in that case, a large-scale wastewater treatment facility that incurs energy costs and equipment costs will be required. Even if water is stored, the amount of waste that can be processed will be limited by the capacity of the tank.

[0006] Therefore, the present invention aims to provide a waste treatment plant and a waste treatment method that can prevent the accumulation of excess moisture and reduce costs. [Means for solving the problem]

[0007] The waste treatment plant according to claim 1 comprises: an aerobic fermentation drying facility that dries waste by aerobic fermentation in a room where air is introduced from the outside and air is discharged to the outside to maintain negative pressure; an air plenum room into which air discharged from the aerobic fermentation drying facility is input, the moisture (humidity) of the air is reduced and output to the outside; a deodorizing facility that biologically deodorizes the air output from the air plenum room using a biofilter containing aerobic microorganisms and exhausts it to the outside; a first circulating water facility that collects and filters wastewater from the aerobic fermentation drying facility and then sprays it onto the waste being aerobically fermented in the aerobic fermentation drying facility; and a second circulating water facility that sprays water onto the biofilter of the deodorizing facility and collects excess water from the spraying and reuses it to spray the biofilter.

[0008] The above-described aerobic fermentation drying equipment involves aerobic fermentation of waste materials in an airtight room that is ventilated but maintained under negative pressure to prevent odor leakage. For example, a housing room with a ventilation structure that takes in outside air and expels internal air, and where the space is defined as an airtight space using concrete or the like, and the waste materials are dried using the heat of fermentation. Preferably, the aerobic fermentation and drying of the waste materials are promoted by supplying air to the waste materials with a fan (blower), etc., which allows for the introduction of air from the outside and the expulsion of air to the outside, and is configured as an airtight room with a controlled negative pressure. The above-mentioned waste refers to household general waste such as food waste and paper scraps, which are combustible waste generated at homes and businesses, as well as office waste, industrial waste such as food waste and animal / food residues.

[0009] The above-mentioned air plenum chamber has a predetermined volume space into which air discharged from the aerobic fermentation drying equipment is input, as well as air with a lower relative humidity than the air discharged from the aerobic fermentation drying equipment. By mixing the air discharged from the aerobic fermentation drying equipment with the air with a lower relative humidity, the humidity of the air discharged from the aerobic fermentation drying equipment is reduced, and air with a lower relative humidity than the air discharged from the aerobic fermentation drying equipment is output to the biological deodorization equipment. Note that the air with a lower relative humidity than the air discharged from the aerobic fermentation drying equipment does not require that the air always has less humidity than the air discharged from the aerobic fermentation drying equipment; it is sufficient that the humidity of the highly humid air discharged from the aerobic fermentation drying equipment can be reduced in the air plenum chamber.

[0010] The above-mentioned deodorization equipment works by passing air discharged from the fermentation drying equipment that aerobically ferments the waste through a biofilter made of a carrier such as wood chips to which aerobic microorganisms are attached, or soil containing aerobic microorganisms, thereby decomposing and deodorizing the waste using the aerobic microorganisms contained in the biofilter. For example, it consists of a biological deodorization device filled with a carrier such as wood chips to which aerobic microorganisms are attached, or soil.

[0011] The first circulating water system described above collects wastewater from the aerobic fermentation drying equipment, that is, leachate seeping from the waste undergoing aerobic fermentation in the aerobic fermentation drying equipment and excess water from the spraying, removes any foreign matter contained therein with a filter, and then sprays the waste undergoing aerobic fermentation in the aerobic fermentation drying equipment. For example, it consists of a circulation path that outputs wastewater from the aerobic fermentation equipment and returns it to the aerobic fermentation equipment, a filtration filter, a pump, a spraying device, and so on.

[0012] Furthermore, the second circulating water system supplies water to the biofilter of the deodorizing equipment by spraying, and recovers excess water from the spraying for reuse. For example, it consists of a circulation path that outputs excess water from the deodorizing equipment and returns it to the deodorizing equipment, a pump, a spraying device, etc.

[0013] The first circulating water equipment of the waste treatment plant according to claim 2 has a first water storage tank that contains water recovered from the aerobic fermentation drying equipment and can be replenished with water from an external source, and the water from the first water storage tank is supplied to the watering of the waste, and the second circulating water equipment has a second water storage tank that contains water recovered from the deodorizing equipment and can be replenished with water from an external source, and the water from the second water storage tank is supplied to the watering of the biofilter. In the first and second water storage tanks mentioned above, sometimes only excess water from watering is stored, and sometimes new water from an external source is added to the excess water from watering and mixed with it.

[0014] The aerobic fermentation drying equipment of the waste treatment plant according to claim 3 has an air circulation unit that draws in air from above from the room in which the waste is being aerobically fermented and dried, and blows the drawn-in air from below into the room to circulate the air, and the air circulated in the air circulation unit is combined with air introduced into the room from the outside and blown out from below into the room.

[0015] The external air introduced into the chamber of the aerobic fermentation drying equipment in the waste treatment plant of claim 4 is the air from inside the building housing the aerobic fermentation drying equipment. Instead of outside air, the air from inside the building, which has less temperature fluctuation than the outside temperature, is introduced into the chamber where the waste is being aerobically fermented, thereby introducing air with less temperature fluctuation than the outside air. It should be noted that the above-mentioned housing does not require that the entire aerobic fermentation drying equipment be housed there, but may be only a part of it, and it is sufficient that the loading and unloading ports for the aerobic fermentation drying equipment are located inside the building and are provided in a continuous manner with the building.

[0016] The air plenum chamber of the waste treatment plant of the invention according to claim 5 reduces the moisture of the air discharged from the aerobic fermentation drying equipment by taking in the air in the building storing the aerobic fermentation drying equipment, and reduces the moisture of the air discharged from the aerobic fermentation drying equipment by mixing the air in the building, which usually has lower moisture than the air discharged from the aerobic fermentation drying equipment, with the air discharged from the aerobic fermentation drying equipment. Also, by taking in the air in the building, where the temperature change can be less than that of the outside air rather than the outside air, it takes in the air with less temperature change than the outside air.

[0017] The waste treatment method of the invention according to claim 6 aerobically ferments and dries the waste in the chamber of the aerobic fermentation drying equipment where air is introduced from the outside and air is discharged to the outside and maintained at a negative pressure in the aerobic fermentation drying process, reduces the moisture of the air discharged from the aerobic fermentation drying equipment where the waste is being aerobically fermented in the exhaust air adjustment process, and in the deodorization process, biologically deodorizes the air humidified in the exhaust air adjustment process with a biofilter containing aerobic microorganisms and exhausts it to the outside. In the aerobic fermentation drying process, wastewater is recovered from the chamber of the aerobic fermentation drying equipment, filtered, and then sprinkled on the waste being aerobically fermented in the chamber of the aerobic fermentation drying equipment. In the deodorization process, water is sprinkled on the biofilter, and the excess water from the sprinkling is recovered and reused for the sprinkling.

[0018] The above aerobic fermentation drying process is carried out in an airtight chamber that can be ventilated but is maintained at a negative pressure to prevent odor leakage. For example, in a housing chamber that forms an airtight space with concrete or the like, which has a ventilation structure that takes in outside air and discharges internal air, the waste is aerobically fermented and dried by the fermentation heat. Preferably, the progress of aerobic fermentation and drying of the waste is promoted by blowing air to supply air to the waste. In the aerobic fermentation drying process, wastewater (leachate) leached from the waste being aerobically fermented is recovered, filtered, and then sprinkled onto the waste. That is, the leachate leached from the waste being aerobically fermented and the excess water from the sprinkling are recovered, foreign substances contained therein are removed by a filter, and then the waste being aerobically fermented is sprinkled with the recovered water. The above-mentioned waste includes household general waste such as combustible waste like food waste and paper scraps discharged from households and business premises, office waste, food waste as industrial waste, and waste such as animal food residues.

[0019] The exhaust air conditioning process is a process of reducing the moisture of the air discharged from the room where the material to be aerobically fermented is being aerobically fermented by mixing the air discharged from the room where the material to be aerobically fermented is being aerobically fermented with air having a relatively lower humidity than the said air, and adjusting the humidity. The mixed conditioned air is supplied to the biological deodorization process.

[0020] The deodorization process is a process of decomposing and deodorizing by aerobic microorganisms contained in a biofilter composed of a carrier such as wood chips with attached aerobic microorganisms or soil containing aerobic microorganisms by ventilating the air in the room where the material to be aerobically fermented is being aerobically fermented through the biofilter. In this deodorization process, water is supplied to the biofilter by sprinkling, and the excess water from the sprinkling is recovered and reused for the sprinkling.

[0021] In the aerobic fermentation drying process of the waste treatment method according to the invention of claim 7, the air in the room where the waste is being aerobically fermented and dried is sucked from above, the sucked air is blown from below in the room and circulated, and the circulated air is merged with the air introduced from the outside into the room, and then blown below in the room.

[0022] In the aerobic fermentation drying step of the waste treatment method of claim 8, the outside air introduced into the chamber where the waste is being aerobically fermented is the air from inside the building that houses the chamber. Instead of outside air, the air from inside the building, which can have less temperature fluctuation than the outside temperature, is introduced into the chamber where the waste is being aerobically fermented, thereby introducing air with less temperature fluctuation than the outside air. It should be noted that the above-mentioned storage does not require that the entire chamber be stored, but may be only a part of it, and it is sufficient that the entrance and exit for the chamber are located inside the building and are provided in a continuous manner with the building.

[0023] The air plenum chamber of the waste treatment plant according to claim 9 reduces the humidity of the air discharged from the chamber where the waste is being aerobically fermented by taking in air from inside the building that houses the chamber where the waste is being aerobically fermented. The humidity of the air discharged from the chamber where the waste is being aerobically fermented is reduced by mixing the air inside the building, which is normally less humid than the air discharged from the chamber where the waste is being aerobically fermented, with the air discharged from the chamber where the waste is being aerobically fermented. Furthermore, by taking in air from inside the building, which can have less temperature fluctuation than the outside temperature, rather than outside air, air with less temperature fluctuation than the outside air is taken in. [Effects of the Invention]

[0024] According to the waste treatment plant of claim 1, the plant comprises: an aerobic fermentation drying facility in which waste is aerobically fermented and dried in a room where air is introduced from the outside and air is discharged to the outside to maintain negative pressure; an air plenum chamber into which air discharged from the aerobic fermentation drying facility is input, the moisture content of the air is reduced and it is output to the outside; a deodorization facility that biologically deodorizes the air output from the air plenum chamber using a biofilter containing aerobic microorganisms and exhausts it to the outside; and wastewater from the aerobic fermentation drying facility is collected, filtered, and then aerobically fermented in the aerobic fermentation drying facility. The system comprises a first circulating water system for spraying water onto the waste, and a second circulating water system for spraying water onto the biofilter of the deodorization equipment, and for recovering excess water from the spraying and reusing it to spray the biofilter. The first circulating water system recovers wastewater from the aerobic fermentation equipment, which aerobically ferments and dries the waste, and recycles it for spraying the waste. The second circulating water system also recovers excess water sprayed onto the biofilter of the biological deodorization equipment and recycles it for spraying the biofilter, thereby reducing the amount of external water used for spraying.

[0025] In particular, according to the waste treatment plant of the invention of claim 1, the air discharged from the aerobic fermentation drying equipment is mixed with dry air, which has a lower relative humidity than the air discharged from the aerobic fermentation drying equipment, in an inexpensive air plenum chamber to reduce its moisture (humidity) before being input to the deodorization equipment and exhausted to the outside. As a result, the water vapor exhausted from the aerobic fermentation drying equipment is less likely to condense in the deodorization equipment and be discharged as exhaust water, and a larger amount of moisture can be exhausted to the outside. Therefore, excess moisture is less likely to accumulate in the deodorization equipment and the second circulating water equipment. Consequently, even with a large amount of waste to be processed, the configuration makes it difficult for excess moisture to accumulate, and makes it possible to eliminate the need for wastewater purification equipment. In other words, it is possible to prevent the accumulation of excess moisture and reduce costs.

[0026] Furthermore, according to the waste treatment plant of claim 2, the first circulating water equipment has a first water storage tank that contains water recovered from an aerobic fermentation facility and can be replenished with water from an external source, and the water from the first water storage tank is supplied to the watering of the waste, and the second circulating water equipment has a second water storage tank that contains water recovered from a deodorizing facility and can be replenished with water from an external source, and the water from the second water storage tank is supplied to the watering of the biofilter.

[0027] Therefore, since water is stored in the first and second water storage tanks, and water can be replenished from an external source when the water level in these tanks becomes low or insufficient, in addition to the effects described in claim 1, the need for external water replenishment can be minimized, and the accumulation of excess water can be further prevented.

[0028] Furthermore, the waste treatment plant according to claim 3 has an air circulation unit that draws in air from above into the room of the aerobic fermentation drying equipment and circulates the drawn-in air by blowing it out from below into the room, and mixes the circulating air with air introduced into the room from the outside and blows it out from below into the room.

[0029] Therefore, according to the waste treatment plant of the invention of claim 3, the air circulation unit creates an air passage through which air flows from bottom to top in the waste accumulated in the chamber of the aerobic fermentation drying equipment, thereby improving the efficiency of aerobic fermentation and drying of the waste by equalizing the air supply to the waste without agitating the waste. In particular, within the aerobic fermentation drying facility, waste is aerobically fermented by aerobic microorganisms, and the heat generated by the fermentation and the aeration cause moisture to evaporate, increasing humidity. As a result, the air drawn in from the top of the room becomes more humid, while the circulating air is mixed with outside air, making the air introduced into the room relatively less humid. That is, by circulating the air drawn in from the top of the room with outside air and blowing it from the bottom of the room, air with a lower relative humidity than the air drawn in from the top of the room passes through the waste from the bottom to the top of the room. Therefore, the air passing through the waste makes it easier to vaporize the moisture in the waste. This improves the drying efficiency of the waste and the amount of moisture evaporated, and the configuration makes it easy to evaporate moisture even with a large amount of waste to process. Thus, in addition to the effects described in claim 1 or claim 2, it is possible to prevent the accumulation of excess moisture in the first circulating water facility.

[0030] According to the waste treatment plant of claim 4, the outside air introduced into the room of the aerobic fermentation drying equipment is the air inside the building housing the aerobic fermentation drying equipment, and is therefore less affected by the outside temperature. That is, even when the outside temperature is low, such as in winter, cold air is not introduced into the room of the aerobic fermentation drying equipment, and a decrease in the vaporization efficiency of moisture can be prevented. Therefore, in addition to the effects described in any one of claims 1 to 3, the accumulation of excess moisture in the first circulating water equipment can be further prevented.

[0031] According to the waste treatment plant of claim 5, the air plenum chamber reduces the humidity of the air discharged from the aerobic fermentation drying equipment by taking in air from the building housing the aerobic fermentation drying equipment, making it less susceptible to the influence of outside temperature. That is, even when the outside temperature is low, such as in winter, cold air is not introduced into the air plenum chamber, preventing the discharge of exhaust water and preventing a decrease in the amount of moisture released from the biological deodorization equipment. Therefore, in addition to the effects described in any one of claims 1 to 4, the accumulation of excess moisture in the second circulating water equipment can be further prevented.

[0032] The waste treatment method according to claim 6 involves an aerobic fermentation drying step in which air is introduced from the outside and discharged to the outside, maintaining a negative pressure in a room where waste is aerobically fermented and dried; an exhaust adjustment step in which the humidity of the air discharged from the room where the waste is aerobically fermented is reduced; and a deodorization step in which the air humidified in the exhaust adjustment step is biologically deodorized by a biofilter containing aerobic microorganisms and exhausted to the outside. In the aerobic fermentation drying step, wastewater is collected from the room, filtered, and then sprayed onto the waste undergoing aerobic fermentation in the room. In the deodorization step, water is sprayed onto the biofilter, and any excess water is collected and reused to spray the biofilter, thus making it possible to reduce the amount of water used from the outside for spraying the waste and the biofilter.

[0033] In particular, according to the waste treatment method of the invention of claim 6, the air discharged from the room where the waste is being aerobically fermented is mixed with dry air with a lower relative humidity than that air to reduce its moisture (humidity) before being subjected to deodorization and exhausted to the outside. As a result, the water vapor exhausted from the room where the waste is being aerobically fermented is less likely to condense in the deodorization equipment and be discharged as exhaust water, and a larger amount of moisture can be exhausted to the outside. Therefore, excess moisture is less likely to accumulate in the deodorization equipment and the equipment that circulates water sprayed there. Consequently, even with a large amount of waste to be processed, the configuration makes it difficult for excess moisture to accumulate, and makes it possible to eliminate the need for wastewater purification equipment. In other words, it is possible to prevent the accumulation of excess moisture and reduce costs.

[0034] According to the waste treatment method of claim 7, in the aerobic fermentation drying step, air from the room in which the waste is being aerobically fermented and dried is drawn in from above, and the drawn-in air is circulated by blowing it from below the room. At the same time, the circulating air is mixed with the outside air and blown from below the room. As a result, an air passage is formed in which air flows from below to above in the waste being aerobically fermented and dried in the room, and the efficiency of aerobic fermentation and drying of the waste can be improved by equalizing the air supply to the waste without agitating the waste. In particular, in a room where waste is being aerobically fermented and dried, the waste is aerobically fermented by aerobic microorganisms, and the heat of fermentation and ventilation cause moisture to evaporate, increasing humidity. As a result, the air drawn in from the top of the room becomes more humid, while the circulating air is mixed with outside air, resulting in relatively less humid air being introduced into the room. That is, by combining the circulating air drawn in from the top of the room with outside air and blowing it from the bottom of the room, air with a lower relative humidity than the air drawn in from the top of the room passes over the waste from the bottom to the top of the room. Therefore, the air passing over the waste makes it easier to vaporize the moisture in the waste. This improves the drying efficiency of the waste and the amount of moisture evaporated, and the configuration makes it easy to evaporate moisture even when processing a large amount of waste. Therefore, in addition to the effects described in claim 6, it is possible to prevent excessive moisture from accumulating in the equipment that circulates water sprayed on the waste.

[0035] According to the waste treatment method of claim 8, in the aerobic fermentation drying process, the outside air introduced into the room where the waste is being aerobically fermented and dried is the air inside the building housing the room where the waste is being aerobically fermented and dried, and is therefore less affected by the outside temperature. That is, even when the outside temperature is low, such as in winter, cold air is not introduced into the room where the waste is being aerobically fermented and dried, thus preventing a decrease in the vaporization efficiency of moisture. Therefore, in addition to the effects described in claim 6 or claim 7, it is possible to further prevent the accumulation of excess moisture in the equipment that circulates water sprayed on the waste.

[0036] According to the waste treatment method of claim 9, in the exhaust adjustment step, the humidity of the air discharged from the room where the waste is being aerobically fermented and dried is reduced by taking in air from the building housing the room where the waste is being aerobically fermented and dried, making it less susceptible to the influence of outside temperature. That is, even when the outside temperature is low, such as in winter, cold air is not introduced, preventing the discharge of exhaust water and preventing a decrease in the amount of moisture released from the biological deodorization equipment that performs biological deodorization. Therefore, in addition to the effects described in any one of claims 6 to 8, it is possible to further prevent the accumulation of excess moisture in the biological deodorization equipment that performs biological deodorization and in the equipment that circulates water sprayed onto the biofilter. [Brief explanation of the drawing]

[0037] [Figure 1] Figure 1 is a flowchart of the waste treatment process in a waste treatment plant according to an embodiment of the present invention. [Figure 2] Figure 2 is a conceptual diagram of waste treatment in a waste treatment plant according to an embodiment of the present invention. [Figure 3] Figure 3 is a conceptual diagram of the post-treatment process after aerobic fermentation treatment in a waste treatment plant according to an embodiment of the present invention. [Modes for carrying out the invention]

[0038] Embodiments of the present invention will be described below with reference to the drawings. In these embodiments, identical symbols and reference numerals represent the same or corresponding functional parts, and therefore, redundant explanations will be omitted here.

[0039] First, the overall general flow of waste treatment in the waste treatment plant according to the embodiment of the present invention will be explained, mainly with reference to the flowchart in Figure 1. The waste treatment in this embodiment 1 is applied to waste recycling, in which waste 1 is recycled into solid fuel, compost, etc. When household or business general waste, such as food waste and paper scraps, which are generated as combustible waste in homes or businesses and collected and transported by garbage trucks 11, or industrial waste such as food waste and animal and plant residues 1, enter the building 110, first, in the crushing process of step S1, the garbage bags containing the food waste, paper, plastics, etc. of the waste 1 are broken open by the crusher 14. The volume is also reduced by coarse crushing or crushing. The ruptured waste 1 is mixed in the subsequent bulk density adjustment step S2 with a bulk density adjusting material 2 such as wood chips, which increases the volume in order to create more aeration voids within the pile of waste 1, and a microorganism-attached material 3 such as fermentation residue granules to which aerobic microorganisms are attached, and the bulk density is adjusted to be within a predetermined range when a predetermined load is applied, thereby forming the aerobic fermentation treated material 100.

[0040] Next, the material to be fermented 100, which has been adjusted to a predetermined bulk density, is loaded into a concrete housing 121 of an aerobic fermentation drying device 120 in an aerobic fermentation drying facility, which is entirely or partially housed within the building 110. There, it is aerobically fermented and dried for a predetermined number of days as part of the fermentation drying process in step 3. At this time, the fermentation drying apparatus 120 sprays water onto the aerobic fermentation material 100 inside the housing 121. In particular, in this embodiment, wastewater discharged into the building 110 and the housing 121, i.e., wastewater seeping from the waste 1 and the aerobic fermentation material 100, is collected, filtered by the filter 172, and the filtered water is used to spray water into the housing 121. Furthermore, in the housing 121 of the aerobic fermentation drying apparatus 120, oxygen is replenished by exchanging the discharge of air (odor) with the intake of fresh air from the building 110, and the temperature and negative pressure inside the housing 121 are controlled.

[0041] In this embodiment, the humid air (odor) discharged from the housing 121 is introduced into the air plenum chamber 130 as part of the exhaust adjustment process in step S5. There, it is mixed with the incoming air taken in from inside the building 110 outside the housing 121, and then sent to the biological deodorizer 140 of the deodorization equipment installed outside the building 110. Then, in the biological deodorization process of step S70, the mixed air from the air plenum chamber 130 has its odor components decomposed and deodorized by aerobic microorganisms in the biological deodorization device 140. The odor components contained therein pass through the biofilter 142, which is made up of a carrier such as wood chips to which aerobic microorganisms have attached, and are then exhausted (released) to the outside, i.e., the outdoor atmosphere. At this time, the biological deodorizer 140 sprays water onto the biofilter 172, and any excess water is collected and reused for spraying.

[0042] Meanwhile, the aerobic fermentation and drying processed material 200, which has completed aerobic fermentation and drying in the aerobic fermentation and drying apparatus 120, is separated in the sorting process of step S4 as a post-processing step. In this process, non-combustible material 230 is removed by magnetic separation, etc., and polyvinyl chloride 240 is removed by infrared separation, etc. Furthermore, based on criteria such as dimensions and gravity (specific gravity), it is separated into solid fuel raw material 210 and / or compost raw material 220, bulk density adjusting material 2 such as wood chips mixed in the bulk density adjustment process of step S2 described above, and aerobic fermentation residue fine particles that are used as microbial attachment material 3 to which aerobic microorganisms are attached.

[0043] Thus, the waste treatment plant of this embodiment recycles waste 1, which contains a mixture of food waste, plastics, paper, cloth, etc., by aerobic fermentation and drying, into solid fuel raw materials 21 and compost raw materials 22. In other words, solid fuel raw materials 21 and compost raw materials 22 are produced by aerobic fermentation and drying of waste 1, which contains a mixture of plastics, paper, cloth, etc.

[0044] In particular, in the waste treatment plant of this embodiment, wastewater discharged into the building 110 and housing 121 is collected, filtered by the filter 172, and then reused for spraying (aerosolizing) water into the housing 121. In addition, the water sprayed by the biofilter 172 of the biological deodorizer 140 is also reused by collecting excess water, so that no wastewater is discharged to the outside. Furthermore, in this embodiment of the waste treatment plant, the air discharged from the aerobic drying and fermentation unit 120 of the aerobic drying and fermentation equipment is mixed with air taken in from inside the building 110 in the air plenum chamber 130 to regulate the exhaust before being sent to the biological deodorization unit 140. This prevents the high humidity discharged from the aerobic drying and fermentation unit 120 of the aerobic drying and fermentation equipment from being discharged as exhaust water in the biological deodorization unit 140, thereby increasing the amount of moisture discharged from the biological deodorization unit 140 and creating a structure that makes it difficult for moisture to accumulate.

[0045] Next, the overall configuration of the waste treatment plant in this embodiment and the details of the overall waste treatment process will be described with reference to Figures 2 and 3. The waste 1 collected by the garbage truck 11, including combustible waste as household or business general waste, and industrial waste such as food waste and animal and plant residues, is unloaded into the receiving yard Y1 inside the building 110 of the waste treatment plant and received inside the building 110. From there, it is relayed by a wheel loader 12, etc., and fed into the hopper of the crusher 14 via a belt conveyor 13, etc. This crusher 14 breaks open garbage bags containing food waste, plastics, paper, cloth, etc. Specifically, the crusher 14 breaks open bags by applying external force, and in particular, the low-speed rotating crusher 14 has a bag-breaking function and a crushing function that performs multi-stage volume reduction, homogenization, and bag-breaking on the received waste 1. Therefore, the waste 1 processed by this crusher 14 is the received waste 1 that has been broken open and reduced in volume. Furthermore, when implementing the present invention, the crusher 14 only needs to have a bag-breaking function, and the crushing method may be any of the following: impact, shear force, rotational force, compression force, etc.

[0046] The waste 1, which has been broken open by the crusher 14, is relayed by a wheel loader 12 or the like and collected in the waste stockyard Y2 inside the building 110. The waste 1 collected in the waste stockyard Y2 is again relayed by the wheel loader 12 or the like and fed into the hopper of the mixer 15 in the mixing work area. In the mixer 15, in addition to the predetermined amount of waste 1 that has been fed in, a predetermined amount of bulk density adjusting material 2 such as wood chips and microbial attachment material 3 to which aerobic microorganisms are attached, such as fine particles of aerobic fermentation residue, are fed in. In this embodiment, before storing the mixture in the housing 121 of the aerobic fermentation drying apparatus 120, which serves as an aerobic fermentation drying facility, the mixture mixed in the mixer 15 is collected in the bulk density adjustment yard Y3 of the mixing work area in the building 110. There, the mixture is mixed a number of times using a wheel loader or the like to ensure uniform mixing, and then a load of 2000 kg / m is applied from above using a plastic, wooden, or metal pallet 17 or the like. 2 The bulk density when a load is applied is 0.40 kg / m³ 3 More than 0.60kg / m 3 Within the following range, more preferably 0.41 kg / m 3 More than 0.59kg / m 3 Within the following range, more preferably 0.42 kg / m 3 More than 0.58kg / m 3 The bulk density is adjusted to fall within the following range to create an aerobic fermented material 100 with a predetermined bulk density.

[0047] Here, the bulk density adjusting material 2 to be mixed with the ruptured waste 1 can be any organic material of a predetermined size that can increase the volume of the aerobic fermentation treated material 100 and create aeration voids within the pile. Preferably, an organic material that is water-absorbing, hygroscopic and can support microorganisms can be used, such as wood chips or other woody materials, or solid fuels such as RDF (Refuse Derived Fuel) or RPF (Refuse Paper & Plastic Fuel) made by solidifying solid fuel raw materials 210 selected from the aerobic fermentation dried treated material 200. Wood chips and solid fuels are low-cost and readily support aerobic microorganisms, allowing for efficient aerobic fermentation through repeated reuse. Therefore, they enable the promotion of aerobic fermentation at low cost. In particular, RDF (Refuse Derived Fuel) solid fuels have a high content of decomposed food waste, which allows for the generation of heat (fermentation heat) through aerobic fermentation by aerobic microorganisms, and is expected to accelerate the aerobic fermentation and drying of the material being treated for aerobic fermentation.

[0048] The bulk density adjusting material 2, such as wood chips or solid fuel, used to form predetermined voids within the deposit of the aerobic fermentation material 100, is preferably, for example, in the range of a diameter of 20 mm or more and less than 50 mm, more preferably 20 mm or more and 48 mm or less, even more preferably 22 mm or more and 48 mm or less, and in the range of a length of 20 mm or more and 250 mm or less, more preferably 50 mm or more and 230 mm or less, even more preferably 80 mm or more and 200 mm or less. If the dimensions are too large, the processing amount of the selective residue 10A and methane fermentation residue 110 will be reduced, resulting in uneconomical operation, and it may also be difficult to secure uniform voids, leading to partial fermentation deficiency. On the other hand, if the dimensions are too small, it may be difficult to secure predetermined voids at the bottom of the deposit, leading to insufficient ventilation, slowing down the processing speed, and reducing the processing efficiency of fermentation and drying. If the dimensions are within the specified range, the required void space can be secured even at the bottom of the sediment, preventing oxygen deficiency and enabling efficient fermentation and drying, as well as economical operation. Therefore, it enables highly efficient processing.

[0049] Furthermore, the efficiency of aerobic fermentation is enhanced by mixing in a microbial attachment body 3 to which aerobic microorganisms are attached. As this microbial attachment body 3, if it is an aerobic fermented and dried product 200 that has already undergone aerobic fermentation, a large number of aerobic microorganisms will be attached to it. Therefore, the remaining aerobic fermentation residue granules or bulk density adjusting material 2 such as wood chips, which remain after the solid fuel raw material 210 and compost raw material 220 have been selected from the aerobic fermented and dried product 200, can be returned and used as the microbial attachment body 3. Thus, bulk density adjusting material 2 such as wood chips that has undergone aerobic fermentation treatment can also function as the microbial attachment body 3. Of course, another carrier to which aerobic microorganisms are attached may also be used.

[0050] Thus, in the bulk density adjustment yard Y3, as a result of mixing the waste 1, the bulk density adjustment material 2, and the microorganism adherent 3 and applying a predetermined load with the pallet 17 or the like, the bulk density when a load of 2000 kg / m 2 is applied is 0.4 kg / m 3 or more and 0.6 kg / m 3 or less, and the aerobic fermentation-treated product 100 is created. Then, the aerobic fermentation-treated product 100 adjusted to the predetermined bulk density is transferred into the housing 121 of the aerobic fermentation dryer 120, where aerobic fermentation and drying processes are performed.

[0051] In this way, according to the aerobic fermentation-treated product 100 adjusted to a bulk density within the range of 0.4 kg / m 2 or more and 0.6 kg / m 3 or less at the bulk density when a load of 2000 kg / m 3 is applied, a sufficient void volume for ventilation is ensured. Therefore, even if there are some refractory impurities mixed in, aerobic microorganisms can operate actively. That is, when the bulk density of the aerobic fermentation-treated product 100 to be aerobically fermented is within the range of 0.4 kg / m 2 or more and 0.6 kg / m 3 or less at the bulk density when a load of 2000 kg / m 3 is applied, by adjusting the bulk density by applying a predetermined load in advance, and by discharging the excessive moisture part of the raw material when a predetermined load is applied in advance, even if the weight of water droplets due to watering from the ceiling side in the housing 121 of the aerobic fermentation drying treatment device 120 is added as described later, and even in the lower part where the upper load of the sediment is applied, it is difficult for the bulk density to change, a void volume that enables ventilation in the deposited aerobic fermentation-treated product 100 is ensured, and oxygen deficiency due to insufficient ventilation is prevented. Therefore, oxygen is supplied evenly without stirring, the movement of anaerobic bacteria is suppressed, the aerobic fermentation by aerobic microorganisms can proceed preponderantly throughout the aerobic fermentation-treated product 100, and aerobic fermentation and drying can be performed efficiently. Even if there are some refractory impurities mixed in, fermentation deficiency is prevented, and aerobic fermentation and drying can be performed in a short time.

[0052] Furthermore, in this embodiment, as will be described later, the air circulation unit 163 draws in indoor air from the top of the housing 121, and air is blown out from the bottom onto the aerobic fermentation material 100 accumulated inside the housing 121, forming an airflow from bottom to top. By adjusting the aerobic fermentation material 100 to a predetermined bulk density, the airflow passing through the internal voids created increases the oxygen supply efficiency, thereby improving the aerobic fermentation efficiency and drying efficiency. In addition, the airflow enables a uniform distribution of microorganisms, allowing for even aerobic fermentation of the entire aerobic fermentation material 100.

[0053] Next, the aerobic fermentation material 100, which has been adjusted to a predetermined bulk density in the bulk density adjustment yard Y3 within the building 110, is transported by a wheel loader or the like into the room of the housing 121 of the fermentation drying apparatus 120, which has an inlet and outlet within the building 110 and is installed continuously with the building 110, where it undergoes aerobic fermentation and drying treatment.

[0054] Here, the housing 121 of the fermentation drying apparatus 120 can be made of concrete, for example, and can be configured to maintain a sealed state that effectively blocks the airflow between the inside and outside, thereby allowing the indoor temperature to be controlled to a degree that does not match the outside temperature. The housing 121 is typically equipped with doors that can be opened and closed to separate the loading / unloading area from the outside airflow. However, even if there is a gap between the loading / unloading area and the door, negative pressure on the interior side prevents airflow from the interior to the exterior, while airflow from the exterior to the interior is permitted. The doors are opened only when loading the aerobic fermentation material 100 and when unloading the aerobic fermentation drying material 200, and remain closed at all times during the processing. The number of housings 121 of the fermentation and drying apparatus 120 is preferably multiple, but may be one. If there are multiple housings, they are operated by batch processing, and the capacity and number of housings can be determined from the number of operating days and the processing volume. The overall shape of the housing 121 is not particularly limited and may be a cylindrical shape with a square cross-section forming the bottom, both sides and the top, or it may be a cylindrical shape with a dome.

[0055] In the fermentation and drying apparatus 120 of this embodiment, an air circulation section 163 is formed by drawing in indoor air from the top of the housing 121 with a fan (blower) 165, compressing the air, and blowing it out from the bottom surface of the housing 121, thereby circulating the air inside the housing 121 and providing aeration to the aerobic fermentation material 100 loaded inside the housing 121. Furthermore, an air discharge section 162 for discharging indoor air from the housing 121 and an air inlet section 161 for introducing air from the building 110 outside the housing 121 into the interior of the housing 121 are formed, providing ventilation that maintains a constant negative pressure inside the housing 121.

[0056] In the fermentation drying apparatus 120 of this embodiment, the input to the interior of the housing 121 of the air inlet 161, which brings in air from inside the building 110 outside the housing 121, and the input to the interior of the housing 121 of the air circulation unit 163, which circulates air drawn in from the top of the housing 121 by blowing it out from the bottom, are combined. A fan (blower) 165 is placed in the confluence path of the air inlet 161 and the air circulation unit 163, and the fan 165 draws in air, which is then used to blow out the air output from the top of the housing 121 and the air taken in from inside the building 110 outside the housing 121, from the bottom surface of the housing 121.

[0057] In particular, in the fermentation drying apparatus 120 of this embodiment, a damper (flow rate adjustment valve) 166a is provided on the input side (intake side) of the fan 165, in the path before the confluence of the air inlet 161 and the air circulation section 163, which can adjust the amount of air introduced from inside the building 110 outside the housing 121 at the air inlet 161. Also, a damper 166b is provided in the air circulation section 163 in the path before the confluence of the air inlet 161, which adjusts the amount of air drawn in from the top of the housing 121. Thus, without switching between the input of fresh air from the air inlet 161 and the input of circulating air from the air circulation section 163, the input amounts of both can be individually adjusted by dampers 166a and 166b, thereby enabling adjustment of the temperature, oxygen content, and pressure maintained at a negative pressure inside the housing 121.

[0058] Therefore, in the fermentation drying apparatus 120 of this embodiment, the fan 165, which is installed in the confluence path of the air inlet 161 and the air circulation 163, drives indoor air into the air circulation 163 from the top of the housing 121, and air is drawn in from inside the building 110 outside the housing 121 into the air inlet 161. The air output from the housing 125 and the air taken in from inside the building 110 outside the housing 121 are mixed in the confluence path of the air inlet 161 and the air circulation 163, and this mixture is blown out from the fan 165 as compressed air and ejected from the bottom surface of the housing 121. In other words, the compressed air that is ejected from the bottom surface of the housing 121 and input into the housing 121 is a mixture of air drawn in from the top of the housing 121 in the air circulation unit 163 and air taken in from inside the building 110 outside the housing 121 in the air introduction unit 161. In this way, fresh air taken in from inside the building 110 outside the housing 121 at the air intake section 161 is supplied to the housing 121 from the bottom surface of the housing 121, thereby replenishing oxygen inside the housing 121.

[0059] In this embodiment, the air drawn in from the top of the housing 121 in the air circulation unit 163 and the air taken in from inside the building 110 outside the housing 121 in the air inlet unit 161 are mixed and supplied to the aerobic fermentation material 100 from the bottom of the housing 121. As a result, the moisture content of this mixed air is relatively lower than that of the air drawn in from the top of the housing 121, making it easier for the moisture inside the aerobic fermentation material 100 to evaporate as the air passes through the material from top to bottom.

[0060] In other words, the air drawn in from the top of the housing 121 by the air circulation unit 163 contains a large amount of moisture from the aerobic fermentation material 100 and moisture evaporated from watering, while the air normally taken in from inside the building 110 outside the housing 121 has relatively less moisture. Therefore, the air that is mixed with the other air and blown out from the bottom of the housing 121 and circulated through the aerobic fermentation material 100 has a relatively lower humidity than the air output from the top of the housing 121. Thus, it is possible to increase the drying efficiency of the aerobic fermentation material 100 by circulating the air through it to dry out the moisture in the aerobic fermentation material 100.

[0061] Furthermore, in a building 110, which is typically constructed with poor ventilation for odor control purposes, the effects of outside temperature are less pronounced even in winter. However, by drawing in air from inside the building 110 instead of outside air at the air intake 161, the temperature drop of the air introduced from the air intake 161 is suppressed even in winter, reducing the burden on aerobic microorganisms and preventing a decrease in the processing efficiency of aerobic fermentation and drying. In other words, by suppressing temperature changes of the air introduced from the air intake 161 without being significantly affected by changes in outside temperature, the burden on aerobic microorganisms is reduced, and the processing efficiency of aerobic fermentation and drying can be maintained.

[0062] Furthermore, in this embodiment, when the fan 165 is operating, the airflow in the air circulation unit 163 and the air inlet unit 161 does not stop, and oxygen is constantly supplied to the aerobic fermentation material 100 by the air inlet unit 161, resulting in high efficiency of aerobic fermentation and drying of the aerobic fermentation material 100 by aerobic microorganisms. In addition, by keeping the fan 165 running at all times, including when the aerobic fermentation material 100 is brought in and when the aerobic fermentation and drying material 200 is unloaded, clogging of the suction and exhaust ports in the housing 121 can be prevented. The airflow may be adjusted by controlling the speed of the fan 165 using inverter control as needed, or energy-saving operation can be performed by reducing the rotation speed. When multiple housings 121 for batch processing are provided, it is preferable to install a fan 165 for each housing 121. Furthermore, in the fermentation drying apparatus 120 of this embodiment, the input to the housing 121 of the air circulation unit 163, which circulates the air inside the housing 121, and the input to the housing 121 of the air introduction unit 161, which introduces air from inside the building 110, are combined, so the number of parts can be reduced and the apparatus can be constructed at a low cost.

[0063] In the fermentation and drying apparatus 120 of this embodiment, an air discharge section 162 is formed to discharge the indoor air of the housing 121 to the outside, and a damper 163c is provided thereto to adjust the amount of air discharged from inside the housing 121. Therefore, the amount of air exhausted to the outside of the air discharge section 162 by the dampers 166a, 166b, and 166c (m³ 3 (m³ / min) and the amount of air (m³ / min) introduced from inside the building 110 into the air inlet 161. 3 By controlling the ( / min) value, the interior of the housing 121 is kept under negative pressure to prevent odors from leaking out of the housing 121, and it is also possible to adjust the temperature, oxygen level, etc., inside the housing 121.

[0064] In other words, in the fermentation drying apparatus 120 of this embodiment, the amount of air introduced into the housing 121 from inside the building 110 outside the housing 121, the amount of circulating air drawn in from the top of the housing 121 and returned to the bottom of the housing 121, and the amount of air exhausted from the housing 121 to the outside can each be individually adjusted by dampers 166a, 166b, and 166c, so that the inside of the housing 121 does not become positive pressure, that is, the inside is negative pressure to prevent airflow from the inside to the outside, so that odors from inside the housing 121 do not escape to the outside of the housing 121, and the inside of the housing 121 is controlled to a temperature and oxygen environment suitable for the growth of aerobic microorganisms and an airflow rate that promotes drying. As will be described later, the air discharge section 162 that discharges air from inside the housing 121 is connected to the air plenum chamber 130, where it is mixed with the air introduced from inside the building 110 outside the housing 121, then deodorized by the biological deodorizer 140, and finally discharged to the outside air (atmosphere).

[0065] Furthermore, in the fermentation drying apparatus 120 of this embodiment, water is sprayed into the interior of the housing 121 from the top of the housing 121. This allows for the uniform addition of moisture necessary for the activity and growth of aerobic microorganisms that aerobically ferment the material to be aerobically fermented 100, thereby increasing the efficiency of aerobic fermentation.

[0066] In particular, in this embodiment, wastewater discharged from inside the housing 121, that is, leachate leached from the waste 1 in the aerobic fermentation material 100 loaded inside the housing 121, excess water from the spraying, and wastewater discharged (generated) in other locations within the building 110 other than the housing 121, such as leachate leached from the waste 1 and wastewater from cleaning equipment, are collected and gathered, filtered for foreign matter etc. using the biofilter 172, and then used for spraying water into the interior of the housing 121.

[0067] In other words, in this embodiment, a first circulating water system 171 is formed that collects wastewater discharged from the housing 121, as well as wastewater discharged from the building 110 other than the housing 121, and sprays them onto the aerobic fermentation material 100 loaded inside the housing 121.

[0068] In the housing 121, a drainage channel is formed at the bottom, and wastewater containing water from the aerobic fermentation treatment material 100 and excess sprayed water is discharged from there to the outside of the housing 121 and collected. After removing foreign matter and other substances contained in the wastewater with a filter 172, the filtered water is returned to the inside of the housing 121 and sprayed from the top of the room as humidifying water. Furthermore, a wastewater collection structure is provided inside the building 110 outside the housing 121 to collect wastewater. Similar to the wastewater collected from the housing 121, foreign matter and other contaminants are removed from the collected wastewater using a filter 172, and then the filtered water is sprayed from the top of the interior of the housing 121 as a humidifier. In other words, the first circulating water system 171 of this embodiment collects wastewater discharged from the housing 121 and wastewater discharged from a location separate from the housing 121, filters it with a filter 172, and then sprays it as water droplets into the interior of the housing 121 using a watering nozzle installed on the ceiling side of the housing 121.

[0069] This first circulating water system 171 includes a water storage tank 173A that collects wastewater discharged from the housing 121 and wastewater discharged from locations other than the housing 121, a filter 172 that filters the water that is pressurized and output from the water storage tank 173A by a pump, and a water storage tank 173B that stores the clean water that has passed through the filter 172. The water collected in the water storage tank 173B is pressurized by a pump and sent to a spray nozzle installed inside the housing 121, and sprayed from the spray nozzle. The filter 172 only needs to remove dirt, sand, fine particles, etc. contained in the wastewater, and is not required to allow aerobic microorganisms to pass through. Furthermore, in this embodiment, a supply passage 174 is provided so that water from the second circulating water equipment 181, which recovers and reuses water sprayed on the biological deodorizer 140 (described later), can also be introduced into the storage tank 173A of the first circulating water equipment 171 via valves, etc. In addition, water from external sources such as industrial water and drinking water can also be introduced into the storage tank 173B via valves, etc.

[0070] Therefore, the water discharged from housing 121 and the water generated in other locations such as building 110 outside of housing 121 are collected in water storage tank 173A. The water collected in water storage tank 173A is then pumped to filter 172, where foreign matter is removed, and then it is fed into water storage tank 173B. The water collected in water storage tank 173B is then pressurized by a pump and sent to a spray nozzle installed inside housing 121, and sprayed from the spray nozzle.

[0071] Thus, in this embodiment of the waste treatment plant, wastewater discharged into the housing 121, including moisture contained in the aerobic fermentation material 100 and excess water sprayed into the housing 121, is discharged outside the housing 121 through a drain formed at the bottom of the housing 121 and is used for watering via a water storage tank 173A, a filter 172, and a water storage tank 173B, thus preventing it from being discharged to the outside. Furthermore, wastewater generated in locations other than the housing 121 is also collected and used for watering the aerobic fermentation material 100, preventing it from being discharged to the outside.

[0072] Furthermore, the first circulating water system 171 of this embodiment is equipped with water storage tanks 173A and 173B, which allows it to respond to fluctuations in water content. When the water in the water storage tanks 173A and 173B becomes insufficient, water can be replenished from the second circulating water system 181 or from an external source, thereby preventing the accumulation of excess water and reducing costs.

[0073] Furthermore, the first circulating water equipment 171 recovers wastewater from inside the housing 121, and also recovers wastewater generated from inside the building 110 other than the housing 121. By spraying this wastewater into the housing 121, it becomes possible to equalize the water supply and replenish the water to the material being aerobically fermented 100 in the housing 121 of the aerobic fermentation drying apparatus 120. This prevents uneven distribution of aerobic fermentation and drying, enables uniform aerobic fermentation throughout the material being aerobically fermented 100, and allows for efficient processing of aerobic fermentation and drying.

[0074] In particular, in the aerobic fermentation drying apparatus 120, wastewater seeping from the material to be aerobically fermented 100 inside the housing 121 is filtered by a filter 172 to remove foreign matter, and then sprayed onto the material to be aerobically fermented 100. Furthermore, the wastewater, including any excess water from the spraying, is collected and reused for repeated spraying. Since the wastewater generated inside the housing 121 contains aerobic microorganisms, the water sprayed as droplets also contains aerobic microorganisms, allowing for a uniform distribution of aerobic microorganisms to the material to be aerobically fermented 100 and increasing the efficiency of aerobic fermentation. That is, the spraying of water droplets also moves the aerobic microorganisms from top to bottom, enabling efficient aerobic fermentation treatment.

[0075] Furthermore, since wastewater from inside the housing 121 and wastewater generated from buildings 110 other than the housing 121 are also collected and used for watering, the water necessary for aerobic microorganisms for efficient aerobic fermentation treatment can be supplied at low cost, and since wastewater is not discharged to the outside, wastewater treatment is not required.

[0076] Furthermore, the water that falls into the drain of the housing 121 may be collected in the water storage tank 173A by being sucked up with a pump or the like when a predetermined amount has been collected, or it may be configured so that the water flows to the water storage tank 173A when the amount of wastewater exceeds a predetermined level. In addition, the components for draining the housing 121 and the components for introducing air into the housing 121 may be shared. That is, in the first circulating water equipment 171, the drainage pipeline that carries the water discharged from the drain located at the bottom of the housing 121 to the water storage tank may be used, and the air introduced into the housing 121 for the air introduction unit 161 and the air circulation unit 163 may be introduced from the drainage pipeline side. In this case, when the drained water is to be carried to the water storage tank 173A with a suction pump or the like, the introduction of air can be stopped by switching the software, thus reducing the number of parts. Of course, it is also possible to configure them separately.

[0077] Thus, in the aerobic fermentation drying apparatus 120 of this embodiment, water droplets are sprayed into the housing 121 where the material to be fermented 100 is loaded by the first circulating water equipment 171, and oxygen is constantly supplied by introducing air from the building 110 outside the housing 121 through the air inlet 161. As a result, the aerobic microorganisms in the material to be fermented 100 containing the attached microorganisms 3 are activated, and aerobic fermentation of the material to be fermented 100 by the aerobic microorganisms proceeds.

[0078] In particular, the aerobic fermentation drying apparatus 120 of this embodiment enables efficient aerobic fermentation processing by controlling the temperature, pressure, and oxygen levels through adjustments to the amount of air exhausted from inside the housing 121 by the air discharge unit 162, the amount of air introduced from outside the housing 121 by the air introduction unit 161, and the amount of air circulated inside the housing 121 by the air circulation unit 163, thereby maintaining an environment suitable for the activation and growth of aerobic microorganisms. In this embodiment, the information of the aerobic fermentation drying apparatus 120 is managed and controlled by a computer. For example, information such as at least the indoor temperature and pressure of the housing 121, the temperature inside the building 110 outside the housing 121, the temperature of the air discharged from inside the housing 121 by the air discharge unit 162, and the temperature of the water sprayed into the housing 121 by the first circulating water equipment 171 are detected by sensors and input into the computer COMP. The information entered into the computer COMP is used to control the damper 166a of the air intake section 161, the damper 166b of the air circulation section 163, the damper 166c of the air discharge section 162, the fan 165, and other components. Furthermore, this computer control enables automatic control of each process. For example, it allows for aeration control in the aerobic fermentation drying apparatus 120, and sensors can monitor temperature, humidity, oxygen concentration, or carbon dioxide concentration. This makes it possible to guarantee the quality of the final product. The control of moisture content, oxygen concentration, and process variables is automated and highly efficient, and moreover, it ensures safe and uniform processing. In addition, processing records are kept for each lot, and compliance with various local government regulations can be proven.

[0079] In the microbial fermentation process in the aerobic fermentation drying apparatus 120 of this embodiment, for the first few days, bacteria, filamentous fungi, etc., actively decompose easily decomposable organic substances in the aerobic fermentation material 100, such as proteins, amino acids, and carbohydrates, raising the temperature of the aerobic fermentation material 100 and, consequently, the temperature inside the housing 121. Once the easily decomposable substances are consumed and the temperature rises, thermophilic aerobic actinomycetes, etc., become involved in the decomposition of organic matter, and the decomposition of hemicellulose and cellulose begins, with the temperature reaching a maximum of 60°C to 80°C. This high-temperature environment kills unwanted bacteria, thereby improving the hygiene of the processed material. Preferably, pathogenic bacteria are sterilized at 65°C or higher for 48 hours or more. Subsequently, a medium temperature range of 30°C to 50°C is maintained to further promote the decomposition of organic matter. After that, the amount of air taken in from outside the housing 121 by the air intake section 161 is increased to promote cooling and drying.

[0080] Thus, in the aerobic fermentation drying apparatus 120 of this embodiment, the decomposition of the aerobic fermentation material 100 by aerobic microorganisms and aerobic fermentation proceed, and drying also proceeds due to fermentation heat and aeration. That is, in this aerobic fermentation drying process (step S3), aerobic microorganisms such as bacteria and filamentous fungi consume oxygen and organic matter from the aerobic fermentation material 100, producing carbon dioxide and energy (heat). The heat generated here raises the temperature of the aerobic fermentation material 100, drying the aerobic fermentation material 100.

[0081] In particular, in this embodiment, the air inlet 161 that brings fresh air into the housing 121 of the aerobic fermentation drying apparatus 120 takes in air from inside the building 110 outside the housing 121, rather than outside air, and introduces it into the housing 121. In this embodiment, the air inlet 161 and the air circulation unit 163 are combined, and the air output from the upper part of the air circulation unit 163 inside the housing 121 is mixed with the air from inside the building 110 outside the housing 121. This mixed air is then input from the lower part of the housing 121, and the mixed air is blown and aerated into the material to be fermented aerobically fermented 100. As a result, oxygen is uniformly supplied to the inside of the material to be fermented aerobically fermented 100, and aerobic fermentation and drying proceed efficiently.

[0082] Here, the interior of the housing 121 is humidified by watering, and the temperature rises due to aerobic fermentation. As a result, the air output from the top of the housing 121 by the air circulation unit 163 becomes more humid and hotter, while the air taken in from the building 110 outside the housing 121 by the air intake unit 161 is relatively drier with lower humidity and temperature. Therefore, in this embodiment, the air output from the top of the housing 121 of the air circulation unit 163 and the incoming air taken in from the building 110 outside the housing 121 are mixed and input from the bottom of the housing 121. As a result, the air that is passed from below to above the aerobic fermentation material 100 is relatively less humid than the air output from the top of the housing 121 of the air circulation unit 163. Thus, the air that passes through the aerobic fermentation material 100 enables the evaporation of moisture in the aerobic fermentation material 100, i.e., promotes drying. This also allows for a larger amount of moisture to be discharged from the air discharge unit 163.

[0083] In particular, the air intake section 161 takes in air from inside the building 110 outside the housing 121, rather than outside air, so it is less affected by outside temperature compared to outside air. That is, inside the highly airtight building 110, which is maintained at a negative pressure to prevent odor leakage, the temperature can be kept higher than the outside air even in winter, and temperature fluctuations can be controlled to be smaller throughout the year compared to the outside temperature. Therefore, even in winter, cold outside air is not taken into the housing 121, and relatively warm air from inside the building 110 is taken into the housing 121, so that even if there are changes in the outside temperature, the efficiency of aerobic fermentation and drying of the aerobic fermentation material 100 loaded inside the housing 121 can be maintained. In other words, even in winter, the temperature difference between the air in the air intake section 161 and the air in the air circulation section 163 can be kept small, and when the air in the air intake section 161 mixes with the air output from inside the housing 121, condensation of moisture is less likely to occur, and evaporation of moisture in the aerobic fermentation material 100, i.e., drying, can be promoted. Furthermore, in a system where air from inside the building 110 is taken into the housing 121 through the air intake section 161, cold outside air is not introduced, which reduces the burden on microorganisms, makes temperature control inside the housing 121 easier, and prevents a decrease in microbial activity, allowing fermentation and drying to proceed efficiently.

[0084] In the aerobic fermentation drying apparatus 120, the aerobic fermented and dried product 220, which has been aerobically fermented by aerobic microorganisms and dried by the heat of fermentation and aeration (airflow), is transported by a wheel loader 12 or the like to the post-processing equipment located in the building 110 for the next sorting process (step S4). As shown in Figure 3, in the post-processing equipment of this embodiment, non-combustible materials 230 and polyvinyl chloride 240 are removed by magnetic separation or near-infrared separation, and the material is further separated by particle size and weight separation into, for example, a bulk density adjusting material 2 which is separated as a predetermined oversized heavy material, solid fuel raw material 210 which is separated as a predetermined oversized light material, and compost raw material 220 or fermentation residue fine material 3 which is separated as a predetermined undersized fine material.

[0085] For example, in the post-processing equipment of this embodiment, the material is first sorted by a particle size and weight sorter 151 using a predetermined airflow for buoyancy and a sieve of a predetermined mesh size for specific gravity, weight, and particle size. The airflow introduced into the sorter 151 is then directed to a cyclone 152, where the vortex flow pushes the debris downwards for removal, and the air from which the debris has been removed is discharged from the top of the cyclone 152. It is also effective to use a fan to draw air from the output side of the cyclone 152.

[0086] This sorting machine 151 primarily separates heavy materials of a predetermined size and weight or more, which mainly include bulk density adjusting materials 2 such as large wood chips (wood stalks); light materials of a predetermined size and weight or less, which mainly include paper and plastics; and fine-grained materials of a predetermined undersize, which mainly include decomposed food waste.

[0087] The materials sorted by the sorting machine 151, which are of a predetermined oversize and weigh more than a predetermined weight, mainly contain bulk density adjusting materials 2 such as large wood chips. After removing non-combustible materials 230 such as iron and magnets by magnetic separation using the magnetic separator 153 or by manual sorting, they are returned to the bulk density adjustment yard Y3 and reused as bulk density adjusting materials 2. Furthermore, the fine granules of a predetermined undersized that have been sorted by the sorting machine 151 are used as compost raw material 220 and / or fermentation residue granules, which are microbially attached material 3, after removing non-combustible materials 230 such as iron and magnets by magnetic separation using the magnetic separator 153. That is, they may be used as compost raw material 220, or the fermentation residue granules, which have a large number of aerobic microorganisms attached to them, may be returned to the bulk density adjustment yard Y3 and used as microbially attached material 3 for inoculum. Furthermore, lightweight materials sorted by the sorting machine 151 that are of a predetermined size and weigh less than a predetermined weight include paper, plastic, etc. Therefore, after removing the polyvinyl chloride 240 by infrared sorting with the infrared sorting machine 154, they become the raw material 210 for solid fuel production.

[0088] The solid fuel raw material 210 is mixed with a calorific value adjusting material such as dry plastic, wood, paper, or cloth in the solid fuel manufacturing process, crushed in a crusher, and further processed to remove non-combustible materials 230 such as iron or stone, and then molded in a molding machine to become solid fuel 211. Additives such as spoilage inhibitors are added as needed during the molding process. Odors, water vapor, etc., generated during the solid fuel manufacturing process, especially the molding process, are sent to a biological deodorizer 140, where they are deodorized before being exhausted outside. The resulting solid fuel 211 has excellent transportability and storage properties, is easy to handle as fuel, and can be used for a variety of purposes (heating, power generation, etc.). Furthermore, the solid raw material fuel 210 can be easily transported to the solid fuel manufacturing process by compressing and packaging it with a baler (compression baler). Furthermore, the compost raw material 220 is left to mature for several days to several weeks in a separate maturation bed, with watering and aeration performed in the same manner as during the aerobic fermentation drying described above. After that, it can be sieved according to its intended use and usage conditions, and further matured if necessary to obtain high-quality compost 221.

[0089] By the way, in the waste treatment plant of this embodiment, the amount of air discharged from the housing 121 by the air discharge unit 162 is set to be greater than the amount of air input into the housing 121 of the air inlet unit 161 and the air circulation unit 163 in the fermentation drying apparatus 120, and by maintaining negative pressure inside the housing 121, there is no possibility of odor escaping outside the housing 121. However, the air (odor) discharged from the housing 121 by the air discharge unit 162 is deodorized by the biological deodorizer 140 before being exhausted to the outside.

[0090] In particular, in the waste treatment plant of this embodiment, the air discharge section 162 that forms the air passage for the air discharged from inside the housing 121 is connected to the air plenum chamber 130, and air from inside the building 110 outside the housing 121 is also introduced into the air plenum chamber 130, where the air discharged from inside the housing 121 and the air from inside the building 110 outside the housing 121 are mixed. Then, the indoor air of the air plenum chamber 130 is supplied to the biological deodorizer 140.

[0091] In this embodiment of the waste treatment plant, a damper 136A and a fan (not shown) are installed in the path for introducing air from inside the building 110 outside the housing 121 into the air plenum chamber 130, allowing adjustment of the amount of air entering the air plenum chamber 130 from inside the building 110. Additionally, the amount of air discharged from inside the housing 121 into the air plenum chamber 130 is also regulated by a damper 166c. By adjusting both, the humidity in the air plenum chamber 130 can be controlled to remain below a predetermined level. Furthermore, a fan 135 and a damper 136B are installed in the air path from the air plenum chamber 130 to the biological deodorizer 140. Air from the air plenum chamber 130 is pressurized by the fan (blower) 135 and supplied to the biological deodorizer 140, and the amount of air supplied from the air plenum chamber 130 to the biological deodorizer 140 can be adjusted by the damper 136C. The fan that guides air from inside the building 110 to the air plenum chamber 130 and the fan 135 that guides air from the air plenum chamber 130 to the biological deodorizer 140 may be controlled by an inverter so that the rotation speed can be controlled, allowing for energy-saving operation by reducing the rotation speed as needed.

[0092] When implementing the present invention, a scrubber device 137 may be installed in the path from the air plenum chamber 130 to the biological deodorizer 140 as needed, to remove harmful substances and other contaminants from the air coming from the air plenum chamber 130 before supplying it to the biological deodorizer 140. Furthermore, a chemical deodorizer can also be provided. In the chemical deodorizer, the gas is forced to pass through a filter medium, where water-soluble compounds contained in the gas are dissolved and absorbed by the moist biofilm covering the filter medium. The biofilm is a thin layer composed of water, polysaccharides, substances originating from the bacterial ecosystem, and substances derived from microorganisms. When gas in the airflow enters the biofilm, the pollutants come into contact with microorganisms, and the compounds are decomposed.

[0093] The biological deodorizer (biofilter) 140, which constitutes the deodorization equipment into which air from the air plenum chamber 130 is introduced, is usually installed outdoors of the building 110 and contains a biofilter 142 made of a carrier to which aerobic microorganisms are attached or naturally present, such as wood chips, compost bedding, soil, or beets, which is piled up and housed in a storage tank 141 that is open at the top. Preferably, the biofilter 142 is wood chips, which have hygroscopic and humidity-regulating properties and can ensure ventilation by being filled into a predetermined size and shape. In detail, the biological deodorizer 140 divides the space vertically at a predetermined height from the bottom of the containment tank 141 and installs a floor material 143 with ventilation holes. A carrier such as wood chips is then deposited on top of the floor material 143 to form a biofilter 142. Air from the air plenum chamber 130 is introduced into the space below the containment tank 141, which is divided by the floor material 143. The air then flows through the ventilation holes in the floor material 143, through the biofilter 142 where the carrier such as wood chips is deposited, from bottom to top, and is released into the atmosphere from above the containment tank 141.

[0094] Then, as the air introduced from the bottom of the containment tank 141 passes through the biofilter 142 from bottom to top, the odor components contained in the air are consumed (decomposed and digested) by aerobic fermentation by aerobic microorganisms attached to the wood chips or other carriers of the biofilter 142.

[0095] Thus, the odor-containing air exhausted from the aerobic fermentation drying apparatus 120 is mixed with the incoming air taken in from inside the building 110 in the air plenum chamber 130, then input into the biological deodorizer (biofilter apparatus) 140, where it is biologically deodorized by the biofilter 172 and released into the atmosphere. In addition, in the biological deodorization device 140, which deodorizes by digestion through biological treatment by aerobic microorganisms, the malodorous gas exhausted from the aerobic fermentation drying device 120 is treated with harmless substances such as CO2 and H2O, and SO4. - No. 3 - It is decomposed into inorganic ions such as and released, but at this time, no residue requiring post-treatment is generated, and it is not incinerated, so CO2 and NO X Emissions are also minimized.

[0096] In this case, the biological deodorizer (biofilter) 140 sprays water onto the biofilter 142, which is made up of accumulated carriers such as wood chips, from above the containment tank 141. This uniformly adds and replenishes the water necessary for the activity and growth of aerobic microorganisms attached to the carriers such as wood chips that decompose and consume the odors input from below the containment tank 141, thus achieving stable deodorization efficiency.

[0097] In particular, in this embodiment, excess water from the watering system is collected and reused for watering. Specifically, in this embodiment, a second circulating water system 181 is formed that collects the excess water that is sprayed from above the storage tank 141 and falls to the bottom, and then sprays it again from above the storage tank 141.

[0098] Within the containment tank 141, excess water from the watering system flows through the holes in the floor material 143 into the space beneath the floor material, where it is discharged outside the containment tank 141 and collected in the water storage tank 183. From the water storage tank 183, a pump or the like pumps the water under pressure to a spray nozzle located above the containment tank 141, and from the spray nozzle, it is sprayed as water droplets onto the biofilter 142. Furthermore, the second circulating water system 181 allows for the replenishment of water from external sources, such as industrial water or drinking water, into the storage tank 183 via valves or the like. In this embodiment, if the supply of water to be sprayed into the housing 121 by the first circulating water equipment 171 is insufficient, water collected in the storage tank 183 of the second circulating water equipment 181 can be supplied to the storage tank 173A of the first circulating water equipment 171 via a supply passage 174 equipped with a valve or the like.

[0099] In this way, the second circulating water system 181 supplies water to the biofilter 172 by spraying, and the excess water sprayed is discharged, recovered, and reused for spraying the biofilter 172. This allows for the supply and equalization of the water necessary for the fermentation and growth of aerobic microorganisms in the biofilter 172, thereby achieving stable deodorization efficiency. In particular, since the excess water collected after passing through the biofilter 172 contains aerobic microorganisms, the water sprayed as droplets also contains aerobic microorganisms, which allows for the uniform distribution of aerobic microorganisms in the biofilter 172 and improves the digestion efficiency by aerobic fermentation. That is, spraying water droplets also moves the aerobic microorganisms from top to bottom, enabling efficient odor treatment. Furthermore, because excess water from the watering system is collected and reused, the water necessary for aerobic microorganisms, which are essential for stable deodorization efficiency, can be supplied at a low cost. Also, since excess water from the watering system is not discharged externally, wastewater treatment becomes unnecessary.

[0100] Furthermore, within the containment tank 141, the water that falls into the space between the flooring material 143 and the bottom surface may be collected by a pump or the like when a predetermined amount has been collected and collected in the water storage tank 183, or the water may be allowed to flow to the water storage tank 183 when the amount of wastewater exceeds a predetermined level. In this configuration, the containment tank 141 is supplied with an air passage for air that enters the space between the flooring material 143 and the bottom surface, passes through the ventilation holes in the flooring material 143 and enters the biofilter 172, and a passage for water that is sprayed onto the biofilter 172 and falls into the space between the flooring material 143 and the bottom surface through the ventilation holes in the flooring material 143. This reduces the number of parts, but it is also possible to configure these components separately.

[0101] In particular, in this embodiment, as described above, the air discharged from the housing 121 of the aerobic fermentation drying apparatus 120 at the air discharge section 162 is mixed with the air inside the building 110 outside the housing 121 in the air plenum chamber 130, and then input into the biological deodorizer 140, from where it is exhausted to the outside air.

[0102] Here, the interior of the housing 121 of the aerobic fermentation drying apparatus 120 is humidified by water spraying, and as the temperature rises due to aerobic fermentation, the air discharged from the top of the housing 121 and fed into the air plenum chamber 130 at the air outlet 163 becomes hotter and more humid, while the air inside the building 110 outside the housing 121, which is fed into the air plenum chamber 130 separately, is relatively drier with lower humidity and temperature.

[0103] Therefore, in the waste treatment plant of this embodiment, in the air plenum chamber 130, the air discharged from the air outlet 162 at the top of the housing 121 is mixed with the air inside the building 110 outside the housing 121. As a result, the air supplied from the air plenum chamber 130 to the biological deodorizer 140 has a relatively lower humidity and temperature than the air discharged from the air outlet 162 at the top of the housing 121.

[0104] Therefore, in the mixed air whose humidity has been reduced in the air plenum chamber 130, the moisture in the air is less likely to condense in the biological deodorizer 140 into which it is input. As a result, the moisture from the humidity discharged from the housing 121 is less likely to be generated as exhaust water in the biological deodorizer 140 and accumulate as moisture in the second circulating water system 181, making it easier to release the amount of moisture from the humidity discharged from the housing 121 into the atmosphere. In other words, a larger amount of moisture can be released into the atmosphere.

[0105] Therefore, in the waste treatment plant of this embodiment, the configuration makes it difficult for water to accumulate in the first circulating water equipment 171 and the second circulating water equipment 172, and since the amount of water from the waste 1 can be released into the atmosphere and consumed without the need to install special wastewater treatment equipment, it is possible to reduce the energy cost of wastewater treatment.

[0106] Furthermore, in a building 110, which is typically constructed with poor ventilation for odor control purposes, the outside temperature does not significantly affect the building even in winter. However, in the air plenum room 130, by drawing in air from inside the building 110 instead of outside air, the temperature drop of the air introduced into the air plenum room 130 is suppressed even in winter. This reduces the load on the aerobic microorganisms contained in the biofilter 142 of the biological deodorizer 140 to which the mixed air from the air plenum room 130 is supplied, thereby suppressing a decrease in deodorization efficiency. In other words, by suppressing temperature changes in the mixed air from the air plenum room 130 without being significantly affected by changes in outside temperature, the load on the aerobic microorganisms in the biofilter 142 is reduced, and the deodorization efficiency can be stabilized.

[0107] In this embodiment of the waste treatment plant, waste 1, which consists of a mixture of food waste, plastics, paper, etc., is mixed with a bulk density adjusting material 2 to increase its volume and a microbial attachment body 3 to which aerobic microorganisms are attached, to form an aerobic fermentation treatment material 100. This material is then subjected to aerobic fermentation, and dried using the heat of fermentation and aeration, thereby being recycled as a raw material for solid fuel 210 or a raw material for compost 220. In this embodiment of the waste treatment plant, the waste 1 is processed in a building 110 that is always kept under negative pressure. The aerobic fermentation and drying of the waste 100 to be aerobic fermented is carried out in a housing 121, which is kept under a negative pressure higher than the outside air pressure in an aerobic fermentation and drying device 120 housed within the building 110, blocking the airflow from the outside to the inside and preventing odor leakage. The air inside the housing 121 is then deodorized by passing through an air plenum chamber 130 and a biofilter 142 made of a carrier such as wood chips filled in a tank 141 in a biological deodorization device 140 installed outdoors, before being exhausted into the atmosphere. Therefore, there is no emission of malodorous odors or uncontrollable odor leakage.

[0108] In particular, in this embodiment, the air discharged from the housing 121 of the aerobic fermentation drying apparatus 120 is mixed with the incoming air taken in from inside the building 110 in the air plenum chamber 130, and then supplied to the biological deodorizer 140, where it is biologically deodorized and then exhausted to the outside. Here, the air discharged from the top of the housing 121 of the air exhaust unit 162 that is input into the air plenum chamber 130 becomes humid air because the inside of the housing 121 is humidified by water spraying and the temperature rises. On the other hand, the air inside the building 110 outside the housing 121 that is separately input into the air plenum chamber 130 is relatively dry air with low humidity. Therefore, in this embodiment, the air discharged from the inside of the housing 121 of the air discharge unit 162 and the air inside the building 110 outside the housing 121 are mixed in the air plenum chamber 130. As a result, the air that is pumped from the air plenum chamber 130 to the biological deodorizer 140 has a relatively lower humidity than the air discharged from the inside of the housing 121 of the air discharge unit 162.

[0109] In other words, according to the waste treatment plant of this embodiment, the highly humid air discharged from inside the housing 121 is mixed in the air plenum chamber 130 with incoming air taken in from inside the building 110 outside the housing 121 to relatively reduce its humidity. This mixture of air with reduced humidity is then supplied to the biological deodorizer 140, where it passes from bottom to top through the biofilter 142 and is exhausted to the outside. As a result, the amount of moisture in the air discharged from inside the housing 121 that is discharged as condensed water (exhaust water) in the biological deodorizer 140 is suppressed, and the amount of moisture released into the outside air can be increased. Consequently, excess moisture is less likely to accumulate in the second circulating water equipment 181 that handles the moisture in the biological deodorizer 140. In other words, according to the waste treatment plant of this embodiment, even if the amount of waste 1 to be treated is large, the configuration makes it easy to exhaust moisture into the atmosphere, preventing the accumulation of excess moisture in the second circulating water equipment 181, and eliminating the need for purification for wastewater.

[0110] In particular, in the air plenum chamber 130, instead of outside air, air from inside the building 110 housing the aerobic fermentation dryer 120 is taken in, reducing the humidity of the air discharged from the aerobic fermentation dryer 120, making it less susceptible to the effects of outside temperature. That is, even when the outside temperature is low, such as in winter, cold air is not introduced into the air plenum chamber 130, preventing the discharge of exhaust water and preventing a decrease in the amount of moisture released from the biological deodorizer 140. Therefore, the accumulation of excess moisture in the second circulating water system 181 can be further prevented. In addition, the load on the aerobic microorganisms contained in the biofilter 142 of the biological deodorizer 140, to which the mixed air from the air plenum chamber 130 is supplied, and the decrease in deodorization efficiency can be suppressed. That is, by suppressing temperature changes of the mixed air from the air plenum chamber 130 without being greatly affected by changes in outside temperature, the load on the aerobic microorganisms in the biofilter 142 is reduced, and the deodorization efficiency can be stabilized.

[0111] Thus, in this embodiment, moisture is dried by the fermentation heat and aeration from aerobic fermentation, preventing that moisture from being discharged as exhaust water in the biological deodorizer 141 and the second circulating water equipment 181, and increasing the amount of moisture released into the atmosphere. This allows for the drying and removal of moisture from the waste 1, and the structure is designed to prevent wastewater from accumulating. Therefore, because moisture from the waste 1 can be easily released into the atmosphere, even when processing large quantities of waste 1, moisture is less likely to accumulate in the plant, eliminating the need for drainage equipment to treat the moisture from the waste 1 and reducing costs.

[0112] Furthermore, in this embodiment, the first circulating water equipment 171 collects wastewater seeping from the aerobic fermentation material 100 in the aerobic fermentation drying apparatus 120 where the aerobic fermentation material 100 is undergoing aerobic fermentation. After filtering the wastewater with a filter 172 to remove foreign matter, the water is sprayed onto the aerobic fermentation material 100 being aerobically fermented in the aerobic fermentation drying apparatus 120. Therefore, the wastewater from the aerobic fermentation drying apparatus 120 is not discharged to the outside, and no purification system is provided for wastewater. Specifically, the first circulating water system 171 contains water recovered from the aerobic fermentation drying apparatus 120 and has storage tanks 173A and 173B that can be replenished with water from the outside. Furthermore, both the first circulating water system 171 and the second circulating water system 181 are equipped with a supply passage 175 that can supply water from storage tank 183 to the water in storage tanks 173A and 173B. Water is stored in storage tanks 173A and 173B, and if the water in storage tanks 173A and 173B becomes depleted or in small quantities, it can be replenished from the second storage tank 183 or from the outside. This minimizes the need for external water supply, prevents the accumulation of excess water, reduces costs, and eliminates the need for water purification for wastewater.

[0113] Furthermore, the first circulating water equipment 171 collects wastewater seeping from the aerobic fermentation material 100 in the aerobic fermentation drying apparatus 120 where the aerobic fermentation material 100 is undergoing aerobic fermentation. After filtering the wastewater with a filter 172 to remove foreign matter, the wastewater is sprayed onto the aerobic fermentation material 100 being aerobically fermented in the aerobic fermentation drying apparatus 120. This enables the uniform supply of moisture necessary for aerobic microorganisms in the aerobic fermentation material 100, prevents uneven distribution of aerobic fermentation, and increases the processing efficiency of aerobic fermentation and drying.

[0114] In particular, in this embodiment, an air circulation unit 163 that circulates air drawn in from above inside the housing 121 of the aerobic fermentation drying apparatus 120 by blowing it out from below inside the housing 121, and an air introduction unit 161 that brings in air from inside the building 110 into the housing 121, merge together, and a mixture of air drawn in from above inside the housing 121 by the air circulation unit 163 and introduced air brought in from inside the building 110 outside the housing 121 by the air introduction unit 161 is blown from below inside the housing 121 to the material to be aerobically fermented 100.

[0115] Therefore, according to the waste treatment plant of this embodiment, the humidity of highly humid air drawn in from above inside the housing 121 and circulated in the air circulation unit 163 is relatively reduced by mixing it with introduced air taken in from inside the building 110 outside the housing 121 in the air introduction unit 161. This mixture of reduced humidity is then supplied to the aerobic fermentation material 100 from below inside the housing 121 and passed from bottom to top over the material. As a result, the air that passes over the aerobic fermentation material 100 is more likely to vaporize the moisture in the material. Consequently, the drying efficiency of the aerobic fermentation material 100 can be improved.

[0116] At this time, the air introduced into the housing 121 of the aerobic drying fermentation dryer 120 by the air inlet 161 is not outside air, but air from inside the building 110, which is kept under negative pressure to prevent odor leakage and maintain high airtightness. Therefore, even when the outside temperature is low, such as in winter, relatively warm air is maintained without cold air being introduced into the housing 121 from the air inlet 161. This prevents the formation of condensed water through mixing with the air in the air circulation unit 163, and thus maintains the vaporization efficiency of moisture, i.e., the drying efficiency.

[0117] Therefore, according to the waste treatment plant of this embodiment, the drying efficiency of the aerobic fermentation material 100 is maintained, and even if the amount of waste 1 to be treated is large, the configuration makes it easy to evaporate moisture, preventing the accumulation of excess moisture in the first circulating water equipment 171, and eliminating the need for purification for wastewater.

[0118] As described above, the waste treatment plant of this embodiment consists of an aerobic fermentation drying facility comprising an aerobic fermentation drying device 121 which aerobically ferments and dries the waste 1 containing the material to be fermented aerobically in a room where air is introduced from the outside and air is discharged to the outside to maintain negative pressure; an air plenum chamber 130 into which the air discharged from the aerobic fermentation drying device 121 is input, the moisture content of the air is reduced and the air is output to the outside; and a biodegradation device that uses a biofilter 142 containing aerobic microorganisms to biodegrade the air discharged from the air plenum chamber 130. The deodorization equipment comprises a biological deodorizer 140 that deodorizes and exhausts the odor to the outside, a first circulating water system 181 that recovers wastewater from an aerobic fermentation drying unit 120 in which aerobic fermentation of a material 100 containing waste 1 is being aerobically fermented, filters it with a filter 172, and then sprays the water onto the material 100 containing waste 1 that is being aerobically fermented in an aerobic fermentation drying unit 121, and a second circulating water system 182 that sprays water onto the biofilter 142 of the biological deodorizer 140, recovers the excess water from the spraying, and reuses it to spray the biofilter 142.

[0119] Thus, according to the waste treatment plant of this embodiment, the first circulating water equipment 171 recovers wastewater from the aerobic fermentation device 121, which aerobically ferments and dries the aerobic fermentation material 100 containing the waste 1, and recirculates it for watering the aerobic fermentation material 100. In addition, the second circulating water equipment 181 recovers excess water that has been watered through the biofilter 142 of the biological deodorization device 140 and recirculates it for watering the biofilter 142, thereby reducing the amount of external water used for watering.

[0120] In particular, according to the waste treatment plant of this embodiment, the air discharged from the aerobic fermentation dryer 120 is mixed with dry air, which has a lower relative humidity than the air discharged from the aerobic fermentation dryer 120, in an inexpensive air plenum chamber 130 to reduce its moisture (humidity) before being input to the biological deodorizer 140 and exhausted to the outside. As a result, the water vapor exhausted from the aerobic fermentation dryer 120 is less likely to condense in the biological deodorizer 140 and be discharged as exhaust water, and a larger amount of moisture can be exhausted to the outside. Therefore, excess moisture is less likely to accumulate in the biological deodorizer 140 and the second circulating water equipment 181. Therefore, even with a large volume of waste 1 to be processed, the system is designed to prevent excessive moisture accumulation, making it possible to eliminate the need for wastewater treatment equipment. In other words, it prevents the accumulation of excessive moisture and reduces costs.

[0121] Furthermore, according to the waste treatment plant of this embodiment, the air plenum chamber 130 reduces the humidity of the air discharged from the aerobic fermentation dryer 120 by taking in air from the building 110 that houses the aerobic fermentation dryer 120, making it less susceptible to the effects of outside temperature. In other words, even when the outside temperature is low, such as in winter, cold air is not introduced into the air plenum chamber 130, preventing the discharge of exhaust water and preventing a decrease in the amount of moisture released from the biological deodorization equipment. Therefore, the accumulation of excess moisture in the second circulating water equipment 181 can be further prevented.

[0122] Furthermore, in this embodiment of the waste treatment plant, the first circulating water equipment 171 has water storage tanks 173A and 173B that contain water recovered from the aerobic fermentation drying device 120 and can be replenished with water from an external source, and the water from water storage tanks 173A and 173B is used to spray the aerobic fermentation treatment material 100 containing the waste 1, and the second circulating water equipment 181 has a water storage tank 183 that contains water recovered from the deodorizing device 140 and can be replenished with water from an external source, and the water from water storage tank 183 is used to spray the aerobic fermentation treatment material 100 containing the waste 1. Moreover, the first circulating water equipment 171 and the second circulating water equipment 181 are provided with a supply passage 175 that can freely supply water from the second water storage tank 183 to the water in the first water storage tanks 173A and 173.

[0123] Therefore, by storing water in water storage tanks 173A, 173B and water storage tank 183, and replenishing the water in water storage tanks 173A and 173B when it runs low or becomes depleted, or replenishing the water in water storage tank 183 when it runs low or becomes depleted, the need to replenish water from external sources can be minimized, excessive water storage can be prevented, and costs can be reduced.

[0124] Furthermore, in this embodiment, the waste treatment plant has an aerobic fermentation drying apparatus 120 which has an air circulation unit 163 that draws in air from above into the housing 121 and circulates the drawn-in air by blowing it out from below into the housing 121. The air circulated in the air circulation unit 163 is mixed with incoming air from the outside and blown out to the bottom of the housing 121.

[0125] Therefore, according to the waste treatment plant of this embodiment, the air circulation unit 163 forms an air passage through which air flows from bottom to top in the aerobic fermentation material 100 containing the waste 1 to be aerobically fermented and dried in the housing 121 of the aerobic fermentation drying apparatus 120. This improves the fermentation and drying efficiency of the aerobic fermentation material 100 by equalizing the supply of air to the aerobic fermentation material 100 without agitating the material. In particular, inside the housing 121, the aerobic fermentation material 100 containing waste 1 is aerobically fermented by aerobic microorganisms, and the heat of fermentation and the evaporation of moisture due to ventilation cause the humidity to rise. As a result, the air drawn in from the top of the housing 121 becomes more humid, while the air introduced into the housing 121 from the outside is relatively less humid. Therefore, by circulating the air drawn in from the top of the housing 121 in the air circulation unit 163 with the introduced air from the outside and blowing it from the bottom of the housing 121, air with a lower relative humidity than the air drawn in from the top of the housing 121 passes over the aerobic fermentation material 100 from bottom to top, making it easier for the moisture in the aerobic fermentation material 100 to vaporize with the air passing over it. Therefore, the drying efficiency of the aerobic fermentation material 100 can be improved, and even if the amount of waste 1 to be processed is large, the configuration makes it easy to evaporate moisture and prevents the accumulation of excess moisture in the first circulating water equipment 171.

[0126] Furthermore, in this embodiment of the waste treatment plant, the outside air introduced into the housing 121 of the aerobic drying and fermentation dryer 120 is the air inside the building 110 that houses the aerobic drying and fermentation dryer 120 and is maintained under negative pressure, so it is less affected by the outside temperature. Therefore, even when the outside temperature is low, such as in winter, air with little temperature change can be introduced into the aerobic drying and fermentation dryer 120 without introducing cold air, thereby maintaining a high vaporization efficiency of moisture. Thus, it is possible to prevent the accumulation of excess moisture in the first circulating water equipment 171 at a low cost.

[0127] Furthermore, the above embodiment includes an aerobic fermentation drying step (step S3) in which the waste 1 of the material to be aerobic fermented 100 is aerobically fermented and dried inside the housing 121 of the aerobic fermentation drying apparatus 120, where air is introduced from the outside and air is discharged to the outside to maintain a negative pressure; and an exhaust adjustment step (step S5) in which the air discharged from the housing 121 in which the waste 1 is aerobically fermented is mixed with introduced air that has a lower relative humidity than the discharged air, thereby reducing the moisture content of the air discharged from the room in which the waste 1 of the material to be aerobically fermented 100 is aerobically fermented. The invention also includes a deodorization step (step S6) in which the air mixed in S5) is biologically deodorized by a biofilter 142 containing aerobic microorganisms and exhausted to the outside, an aerobic fermentation drying step (step S3) in which wastewater is collected from the room where the aerobic fermentation of the material to be aerobically fermented 100 is taking place, filtered by a filter 172, and then sprayed onto the material to be aerobically fermented 100 containing the aerobic fermented waste 1 and circulated, and a deodorization step (step S6) in which water is sprayed onto the biofilter 172 and excess water is collected and reused to spray the biofilter 172 and circulated.

[0128] According to this embodiment of waste treatment method, in the aerobic fermentation drying process (step S3), wastewater from inside the housing 121 of the aerobic fermentation drying apparatus 120, which aerobically ferments and dries the waste 1 of the material to be aerobically fermented 100, is recovered and recycled for watering the material to be aerobically fermented 100 containing the waste 1. In addition, excess water sprayed onto the biofilter 142 is also recovered and recycled for watering the biofilter 142, making it possible to reduce the amount of external water used for watering.

[0129] In particular, according to the waste treatment method of this embodiment, in the exhaust adjustment step (step S5), the air discharged from the housing 121 of the aerobic fermentation dryer 120 is mixed with dry air with a lower relative humidity than that air to reduce its moisture content, and then biologically deodorized in the deodorization step (step S6) before being exhausted to the outside. As a result, water vapor exhausted from the housing 121 of the aerobic fermentation dryer 120 is less likely to be discharged as exhaust water within the biological deodorizer 140 equipped with the biofilter 142, and a larger amount of moisture can be exhausted to the outside. Therefore, excess moisture is less likely to accumulate in the biological deodorizer 140 and the second circulating water equipment 181. Therefore, even with a large volume of waste 1 to be processed, the system is designed to prevent excessive moisture accumulation, making it possible to eliminate the need for wastewater treatment equipment. In other words, it prevents the accumulation of excessive moisture and reduces costs.

[0130] Furthermore, according to the waste treatment method of this embodiment, in the exhaust adjustment step (step S5), the moisture content of the air discharged from the aerobic fermentation dryer 120 is reduced by taking in air from inside the building 110 that houses the aerobic fermentation dryer 120, making it less susceptible to the influence of outside temperature. That is, even when the outside temperature is low, such as in winter, cold air is not introduced into the air plenum chamber 130, preventing the discharge of exhaust water and preventing a decrease in the amount of moisture released from the biological deodorization equipment. Therefore, the accumulation of excess moisture in the second circulating water equipment 181 can be further prevented. In addition, the load on the aerobic microorganisms contained in the biofilter 142 of the biological deodorization equipment 140, to which the mixed air from the air plenum chamber 130 is supplied, can be reduced, and a decrease in deodorization efficiency can be suppressed.

[0131] Furthermore, according to the waste treatment method of this embodiment, in the aerobic fermentation drying process (step S3), air is drawn in from above from inside the housing 121 where the waste 1 of the aerobic fermentation material 100 is being aerobically fermented and dried. The drawn-in air is then blown in from below inside the housing 121 and circulated. This circulating air is mixed with air introduced from the outside and blown in from below inside the housing 121. As a result, an air passage is formed in the aerobic fermentation material 100 containing the waste 1 being aerobically fermented inside the housing 121 of the aerobic fermentation drying apparatus 120, allowing air to flow from below to above. This improves the efficiency of fermentation and drying of the aerobic fermentation material 100 by equalizing the supply of air to the aerobic fermentation material 100 without agitating the material. In particular, inside the housing 121, the aerobic fermentation material 100 containing waste 1 is aerobically fermented by aerobic microorganisms, and the heat of fermentation and the evaporation of moisture due to ventilation cause the humidity to rise. As a result, the air drawn in from the top of the housing 121 becomes more humid, while the air introduced into the housing 121 from the outside is relatively less humid. Therefore, by circulating the air drawn in from the top of the housing 121 in the air circulation unit 163 with the introduced air from the outside and blowing it from the bottom of the housing 121, air with a lower relative humidity than the air drawn in from the top of the housing 121 passes over the aerobic fermentation material 100 from bottom to top, making it easier for the moisture in the aerobic fermentation material 100 to vaporize with the air passing over it. Therefore, the drying efficiency of the aerobic fermentation material 100 can be improved, and even if the amount of waste 1 to be processed is large, the configuration makes it easy to evaporate moisture and prevents the accumulation of excess moisture in the first circulating water equipment 171.

[0132] Furthermore, according to the waste treatment method of this embodiment, in the aerobic fermentation drying process (step S3), the outside air introduced into the housing 121 of the aerobic fermentation drying apparatus 121 is the air inside the building 110 that houses the aerobic fermentation drying apparatus 121 and maintains negative pressure, so it is less affected by the outside temperature. Therefore, even when the outside temperature is low, such as in winter, cold air is not introduced into the housing 121 of the aerobic fermentation drying apparatus 120, and air with little temperature change can be introduced, thereby maintaining a high vaporization efficiency of moisture. Thus, it is possible to prevent the accumulation of excess moisture in the first circulating water equipment 171 at low cost. Thus, according to the waste treatment plant and waste treatment method of this embodiment, it is possible to prevent the accumulation of excess water in the first circulating water equipment 171 and the second circulating water equipment 172, thereby reducing costs.

[0133] It should be noted that while the above explanation of aerobic fermentation has been based on the premise of using aerobic microorganisms, this does not mean that there is absolutely no attachment of anaerobic microorganisms. Rather, it means that an environment is created in which aerobic microorganisms can function. When implementing the present invention, the configuration, components, formulation, manufacturing method, etc., of other parts of the waste treatment plant and waste treatment method are not limited to the above-described examples. Furthermore, not all of the numerical values ​​given in the embodiments and examples of the present invention represent critical values; some values ​​represent suitable values ​​for implementation. Therefore, slightly changing the above values ​​within the permissible range does not negate the possibility of implementation. [Explanation of Symbols]

[0134] 1. Waste 2. Bulk density adjusting material 3. Microbial attachments 100 Aerobic fermented products 110 Building 120 Aerobic fermentation drying apparatus 130 Air Plenum Room 140 Biological Deodorization Device 142 Biofilter 171 First circulating water equipment 181 Second circulating water facility 200 Aerobic fermentation dried product 210 Solid fuel raw materials 220 Compost raw material Y3 Bulk Density Adjustment Yard (Bulk Density Adjustment Work Area)

Claims

1. An aerobic fermentation drying facility that dries waste by aerobic fermentation in a room where air is introduced from the outside and exhausted to the outside, maintaining a negative pressure, An air plenum chamber is provided, into which air discharged from the aerobic fermentation drying equipment is introduced, and after humidity control is performed to reduce the moisture content of the air, the air is discharged. A deodorization system that biologically deodorizes the air discharged from the air plenum chamber using a biofilter containing aerobic microorganisms and then exhausts it to the outside, A first circulating water system that collects wastewater from the aerobic fermentation drying equipment in which the waste is undergoing aerobic fermentation, filters it, and then sprays the water onto the waste undergoing aerobic fermentation in the aerobic fermentation drying equipment, A second circulating water system that sprays water onto the biofilter of the deodorizing equipment, recovers excess water from the spraying, and reuses it for spraying the biofilter. It is equipped with, A waste treatment plant characterized by controlling the humidity of the air plenum chamber to be below a predetermined level.

2. The first circulating water equipment has a first water storage tank that contains the water recovered from the aerobic fermentation drying equipment and can be replenished with water from an external source, and the water from the first water storage tank is supplied to the watering of the waste. The waste treatment plant according to claim 1, wherein the second circulating water equipment has a second water storage tank that contains the water recovered from the deodorizing equipment and can be replenished with water from an external source, and the water from the second water storage tank is supplied to the water spraying of the biofilter.

3. The aerobic fermentation drying equipment has an air circulation unit that draws in air from above from above from the room in which the waste is undergoing aerobic fermentation, and blows the drawn-in air from below from the room to circulate the air, and the air circulated in the air circulation unit is mixed with air introduced from the outside and blown from below from the room, as described in claim 1 or 2 of the waste treatment plant.

4. The waste treatment plant according to any one of claims 1 to 3, characterized in that the outside air introduced into the room of the aerobic fermentation drying equipment is the air inside the building housing the aerobic fermentation drying equipment.

5. The waste treatment plant according to any one of claims 1 to 4, characterized in that the air plenum chamber reduces the moisture content of the air discharged from the aerobic fermentation drying equipment by taking in air from inside the building housing the aerobic fermentation drying equipment.

6. An aerobic fermentation and drying process in which waste is aerobically fermented and dried in a room where air is introduced from the outside and exhausted to the outside, maintaining a negative pressure, An exhaust air conditioning process that reduces the humidity of the air discharged from the room where the waste is undergoing aerobic fermentation and controls humidity, The deodorization process involves biologically deodorizing the air that has been humidified in the exhaust adjustment process using a biofilter containing aerobic microorganisms and then exhausting it to the outside. It is equipped with, In the aerobic fermentation drying process, wastewater is collected from the room, filtered, and then sprayed onto the waste undergoing aerobic fermentation in the room. In the exhaust adjustment process, the humidity of the air plenum chamber where humidity control is performed is controlled to be below a predetermined level. A waste treatment method characterized in that, in the deodorization step, water is sprayed onto the biofilter, and excess water is recovered and reused to spray the biofilter.

7. The waste treatment method according to claim 6, characterized in that, in the aerobic fermentation drying step, air in the room in which the waste is undergoing aerobic fermentation is drawn in from above, the drawn-in air is blown in from below the room to circulate the air, and the circulating air is mixed with air introduced from the outside and blown in from below the room.

8. The waste treatment method according to claim 6 or 7, characterized in that, in the aerobic fermentation drying step, the outside air introduced into the room in which the waste is undergoing aerobic fermentation is the air inside the building housing the room.

9. The waste treatment method according to any one of claims 6 to 8, characterized in that the exhaust adjustment step reduces the humidity of the air discharged from the room where the waste is undergoing aerobic fermentation by taking in air from inside the building that houses the room where the waste is undergoing aerobic fermentation.

Images