KR101594109B1 - Method for treating organic waste - Google Patents

Abstract

A method of treating organic waste is disclosed. According to an embodiment of the present invention, there is provided a method of treating organic wastes, the method comprising: bringing organic wastes collected from a source of organic wastes into a hopper; Supplying the organic wastes stored in the hopper unit to each of the drying tanks of the low temperature drying unit; Cryogenic drying of the organic waste with low temperature dry air in each of the low temperature drying tanks; Transferring the dried organic waste in each of the low temperature drying tanks to the high temperature drying unit; And high-temperature drying the organic waste that has been dried in the high-temperature drying unit.

Description

[0001] METHOD FOR TREATING ORGANIC WASTE [0002]

The present invention relates to a method for treating organic wastes.

Sludge, which is one of the organic wastes in general, is also called sludge, and it is difficult to dispose of sludge because it contains more than 80% of water because it is a sediment produced in sewage treatment or water purification process.

Therefore, until now, sludge has been stabilized by anaerobic treatment (anaerobic treatment) and dehydrated and buried. However, this treatment method has been much studied due to the difficulty in treatment due to the increase of the sludge amount due to the rapidly accelerating industrial development.

BACKGROUND ART Recently, a technique of directly supplying hot air at a high temperature to a device storing sludge or supplying cold air with a low water content to reduce moisture of the sludge, and supplying high temperature heat to the sludge, A sludge drying apparatus is used which minimizes the weight and volume of the sludge and reduces the water content of the sludge.

However, in the conventional sludge drying apparatus, the moisture contained in the sludge is dried by a hot-drying method (rotary kiln, disk) by hot air at 800 ° C or more, There is a problem in that a considerable amount of budget is required to be spent as a facility cost for post-treatment facilities for preventing air pollution.

In addition, in the conventional sludge drying apparatus, in order to speed up the heat transfer in the heating and drying of the sludge, even if the temperature of the drying apparatus is raised, the outer sludge first absorbs the heat energy and vaporizes moisture with water vapor. Heat transfer interruption phenomenon occurs which interrupts the supply of heat energy necessary for vaporization. Since the sludge is sequentially dried from the surface due to the heat-blocking phenomenon, the supply of heat energy necessary for drying is blocked.

As described above, the conventional sludge drying apparatus has a problem in that the drying rate and the drying rate are lower than the applied heat quantity.

In addition, sewage sludge is widely recycled as an agricultural organic raw material, but since purified water sludge has a smaller organic matter content than sewage sludge, it is practically difficult to utilize it as an agricultural organic raw material such as fertilizer. For this reason, there have been attempts to apply the present invention to mainly earthwork materials, ceramics, and mulch tile materials by using an inorganic material which is the subject of water sludge and a material close to clay in classification of the soil.

Water sludge contains a large amount of inorganic substances and has a property of hardening like a metal at 1000 ° C or higher. For this reason, when treated in the same manner as the general sewage sludge treatment method, the solidified product after the treatment of the purified sludge should be crushed through a separate crushing process. In addition, purified water sludge has fewer offensive odors than sewage sludge and is easy to reduce water content.

Conventional sludge disposal apparatuses have been designed and manufactured so as to treat both sewage sludge and purified water sludge (or constant sludge) while ignoring the difference in characteristics between purified water sludge and sewage sludge. This leads to an increase in the production cost of the sludge disposal apparatus and an additional unnecessary process in the treatment of the purified sludge, thus greatly reducing the economical efficiency.

Embodiments of the present invention seek to provide a method of treating organic wastes that can continuously dry treat organic wastes.

Embodiments of the present invention provide an organic waste disposal method capable of maximizing the organic waste disposal efficiency.

Embodiments of the present invention are intended to provide a method of treating organic wastes capable of continuously treating a high temperature drying treatment of organic wastes in a high temperature drying section.

Embodiments of the present invention provide a method of treating organic wastes that can reduce organic wastes with low energy.

Embodiments of the present invention provide an organic waste disposal method that can be used to optimize the drying of organic wastes and at the same time lower the water content of the organic wastes in a very short time and thereby reduce waste of energy.

The objects of the present invention are not limited thereto, and other objects not mentioned can be clearly understood by those skilled in the art from the following description.

According to an aspect of the present invention, there is provided a method for producing organic wastes, comprising the steps of: bringing organic wastes collected and transported from a source of organic wastes into a hopper; Supplying the organic wastes stored in the hopper unit to each of the drying tanks of the low temperature drying unit; Cryogenic drying of the organic waste with low temperature dry air in each of the low temperature drying tanks; Transferring the dried organic waste in each of the low temperature drying tanks to the high temperature drying unit; And drying the organic waste that has been dried in the high temperature drying unit at a high temperature.

In addition, the organic waste may be supplied to each of the low temperature drying tanks sequentially.

Also, in the transfer step, the organic waste that has been dried with the time difference in each of the low temperature drying tanks is successively transferred to the high temperature drying unit, and the organic waste can be continuously dried at high temperature without waiting time in the high temperature drying unit.

The low temperature drying step may be temporarily stored in the dry powder storage tank before the organic waste dried in the low temperature drying tank is supplied to the high temperature drying unit.

Also, in the low-temperature drying step, the dried organic wastes temporarily stored in the dry powder storage tank are supplied to the high-temperature drying unit so that the high-temperature drying unit continuously processes the organic wastes without waiting time As shown in FIG.

In addition, the steam generated in the low temperature drying step and the high temperature drying step may be returned to the organic waste generation source through the evaporated water returning unit.

Also, in the supplying step, the organic wastes corresponding to the throughputs are supplied to the low temperature drying tanks one by one at a predetermined time interval, and the drying time is set by a time of organic wastes input time, drying time and organic wastes discharge time Organic wastes can be supplied sequentially.

In the drying step, the organic waste discharge time may correspond to a time required to dry the organic waste that has been dried in one low-temperature drying tank at a high-temperature drying unit, .

In the low-temperature treatment step, the organic waste may be dried by supplying dry air at a temperature of 100 ° C or lower to the inner cylinder of the low-temperature drying tank filled with the organic waste.

The low temperature treatment step may include optimizing the evaporation action by the drying air in the low temperature drying tank, and the optimizing step may include measuring a weight change amount of the organic waste charged in the low temperature drying tank, The drying curve can be calculated and the flow rate of the dry air supplied to the low temperature drying tank can be controlled by comparing the slope of the predetermined drying curve with the slope of the calculated drying curve.

Also, in the low-temperature drying step, when the temperature of the organic waste charged in the low-temperature drying tank is lower than a preset temperature, the low-temperature drying tank may be preheated using waste heat generated in the high-temperature drying step.

Embodiments of the present invention can maximize organic waste disposal efficiency by successively drying successively organic wastes in multi-type low temperature drying tanks arranged in parallel.

The embodiments of the present invention have a remarkable effect that the drying process can be continuously performed in the remaining low temperature drying tanks even if any one of the independently operated low temperature drying tanks is shut down.

The embodiments of the present invention have a remarkable effect that the high temperature drying process of the dried organic waste (dry matter) in the high temperature drying section is continuously treated without the waiting time, thereby stopping the operation of the high temperature drying section.

Embodiments of the present invention can reduce operating costs by reducing the moisture content of high-moisture organic wastes with only dry air without boiling.

Embodiments of the present invention can reduce facility operation cost by utilizing waste heat.

Embodiments of the present invention can predict and control the target amount of water deviation.

1 is a side view showing an organic waste treatment facility according to an embodiment of the present invention.
2 is a top view of the organic waste treatment facility shown in FIG.
3 is a cross-sectional view taken along the line aa in Fig.
4 is a cross-sectional view taken along the line bb shown in Fig.
5 is a cross-sectional view taken along the line cc shown in Fig.
Figure 6 is a table showing the process timetable in low temperature drying tanks.
FIG. 7 is a process diagram of the organic waste treatment facility shown in FIG. 1; FIG.
8 is a view for explaining a process of treating organic waste in a drying unit.
Figure 9 is a graph showing the drying curves of the optimized organic waste.
10 is a view showing another example of the organic waste treatment facility.
11 is a view showing a modified example of the organic waste supply and discharge system in the low temperature drying tank.

BRIEF DESCRIPTION OF THE DRAWINGS The present invention is capable of various modifications and various embodiments, and specific embodiments are illustrated in the drawings and will be described in detail in the detailed description. It is to be understood, however, that the invention is not to be limited to the specific embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the like elements throughout the specification and claims. The description will be omitted.

1 and 2 are a side view and a plan view showing an organic waste treatment facility according to an embodiment of the present invention, and FIGS. 3 to 5 are sectional views taken along lines aa, bb, and cc shown in FIG. 1 .

 1 to 5, an organic waste treatment facility 10 according to an embodiment of the present invention includes a hopper unit 900, a supply unit 800, a low temperature drying unit 100, a transfer unit 200, (300).

Here, organic wastes may be mainly organic sludge such as food sludge (waste) or livestock manure sludge in addition to sludge generated in purified water, lower wastewater, and the like.

The hopper unit 900 is installed in the low temperature drying tanks 110 of the low temperature drying unit 100. The hopper unit 900 is a facility in which organic wastes collected from the organic waste generation source are transported and temporarily stored, And a storage tank 910 through which organic wastes that can be treated for one day (24 hours) can be stored. For example, assuming that there are 8 tonnes of organic waste that can be treated in a low temperature drying tank 110 for a day and a total of six low temperature drying tanks are installed, the storage tank 910 contains approximately 50 tonnes of organic waste Quot; can be stored.

A sludge discharge conveyor 920 and an internal circulation unit 930 are installed in the storage tank 910. The internal circulation unit 930 distributes the organic waste evenly so that the organic waste introduced into the storage tank 910 is not accumulated on one side, and is provided for smooth transportation. The inner circulation unit 930 includes a rotation shaft 932 installed in the storage tank 910 in the same direction as the sludge discharge conveyor 920 and wings 934 zigzagged on the rotation shaft 932 and a storage tank 910 And a driving unit 936 installed outside the rotating shaft to rotate the rotating shaft.

For example, the organic waste introduced into the hopper unit 900 may be sludge generated from sewage, purified water, etc., and may have a water content of 70% or more.

The supply unit 800 sequentially supplies the organic waste from the hopper unit 900 to each of the low temperature drying tanks 110 of the low temperature drying unit 100. The supply unit 800 includes a main transport path 810 and a branch transport path 840. The main conveyance path 810 may be a conveyance conveyor for conveying the organic waste from the hopper portion 900 to the low temperature drying unit 100. As an example, the conveying conveyor may be provided as a belt conveyor or a screw conveyor.

The branch conveying path 840 is branched from the main conveying path 810 and connected to each of the low temperature drying tanks 110 to be conveyed to a conveying conveyor for supplying the organic waste from the main conveying path 810 to each of the low temperature drying tanks 110 Can be provided. In one example, a total of three branch conveying paths 840 are provided, and are installed across the main conveying path 810. Low temperature drying tanks 110 may be disposed at both ends of each branch conveying route 840. The branch conveyance route supply unit 800 sequentially supplies organic wastes to each of the six low temperature drying tanks 110. For example, the feeder can sequentially supply organic waste from the first low temperature drying tank to the sixth low temperature drying tank at a predetermined time interval. On the other hand, the low temperature drying tank 110 is provided with an individual door which is opened when the organic waste is supplied.

The low-temperature drying unit 100 finally drys the organic wastes having a high moisture content (70 to 80%), which is difficult to dry using dry air at 100 ° C or lower, to a moisture content of 12 to 18%. For example, the low-temperature drying unit 100 removes moisture from the organic waste by using dry air at 90-99 ° C.

The present invention is a low-consumption type drying apparatus which has a small amount of energy to be supplied, compared with the fact that the temperature of the air used for drying the organic waste does not exceed 99 ° C,

FIG. 8 is a view for explaining a process of treating the organic waste in the drying unit, and FIG. 9 is a graph showing a drying curve of the optimized organic waste.

Referring to FIGS. 2 and 8, the low temperature drying unit 100 includes six low temperature drying tanks 110, an air supply member 120, and a control unit 130.

In the organic waste treatment facility of the present invention, the six low temperature drying tanks 110 operate independently, and even if some low temperature drying tanks 110 among the six low temperature drying tanks 110 are shut down for maintenance, In the tank 110, the process can be continuously performed. As described above, the low temperature drying tanks independently operated can be arranged in parallel with the main transport path 810 between the six low temperature drying tanks, as shown in FIG.

Each low temperature drying tank 110 includes an inner cylinder 112 and an outer cylinder 116.

The inner tube 112 has an inner space 113 in which the organic waste is filled. The inner cylinder 112 is formed on the upper side with the inlet opening for introducing the organic waste opened, and the outlet 114 is provided on the lower side.

The organic waste (dry matter) dried in the low temperature drying tank 110 is temporarily stored in the dry powder storage tank 170 installed under the low temperature drying tank 110. The dry powder storage tank 170 stores a predetermined amount or more of dry powder to discharge the amount of dry powder required by the high temperature drying unit 300. The low temperature drying unit 100 does not supply the dry matter dried in the low temperature drying tank 110 to the high temperature drying unit 300 but temporarily stores it in the drying powder storage tank 170, The high-temperature drying unit 300 can continuously perform high-temperature drying treatment on the dry matter without waiting time in the high-temperature drying unit 300.

On the other hand, a slide gate 180 is provided between the low temperature drying tank 110 and the dry powder storing tank 170. The organic waste (dry matter) dried from the discharge port 114 of the low temperature drying tank 110 is introduced into the dry powder storage tank 170 by the opening operation of the slide gate 180. The dry powder storing tank 170 has a fixed amount discharging device 190 for discharging a predetermined amount of dried powder stored in the conveying part 200 to the lower side. The fixed amount discharging device 190 is connected to one end of the conveying part 200 and the dried powder is dropped into the conveying part 200 through the fixed amount discharging device 190.

The inner cylinder 112 of the low temperature drying tank 110 is provided with a plurality of air injection means 192 connected to the pipe 122. The air jetting means 192 includes jet nozzles 194 formed with a plurality of jet nozzles for uniformly supplying dry air to organic wastes filled in the inner jet 112 of the low temperature drying tank 110. For example, the ejection orifices formed in the ejection nozzle tube 194 can eject dry air downward so as not to be blocked by the organic waste. In the low temperature drying tank 110, dry air of less than 90-99 ° C is injected through the spray nozzle tubes 194 to dry the organic waste by the relative humidity and the saturated vapor pressure difference.

The inner cylinder 112 of the low temperature drying tank 110 may be provided with mixing modules MX for improving the low temperature drying efficiency through the drying air by increasing the air flow rate by facilitating the internal flow. For example, the mixing module MX may include a rotating shaft that crosses the inner tube 112, wings that are staggered on the rotating shaft, and a driving unit that rotates the rotating shaft.

The outer cylinder 116 is installed so as to surround the inner cylinder 112. Between the outer cylinder 116 and the inner cylinder 112 is provided a heat exchange space 118 through which waste heat supplied from the waste heat treatment unit 380 of the high temperature drying unit 300 is supplied.

The air supply member 120 heats the dry air so that the saturated water vapor amount of the dry air is increased, and supplies the heated dry air to the low temperature drying tank 110. The air supply member 120 includes a heater 122 and a blower 124. The heater 122 may be a heater using various resistance heating coils, for example.

The air supplied to the heater 122 through the blower 124 is heated to a temperature suitable for drying the organic waste and then supplied to the inner cylinder 112 of the low temperature drying tank 110. [ In one example, the air can be heated to a temperature of 90-99 DEG C or lower. The air supply member 120 and the low temperature drying tank 110 are connected by a pipe 126 and the dry air discharged from the heater 122 is supplied to the low temperature drying tank 110 through the pipe 126.

In one example, the blower 124 may be a multi stage blower. When the multi-stage blower passes through each stage, air is compressed to generate pressure and air volume. At this time, as the temperature rises, the suction temperature at the inlet of each stage rises and the efficiency gradually increases Can be imported.

The control unit 130 controls the temperature and the flow rate of the heated dry air supplied to the low temperature drying tank 110 so that the evaporation action by the dry air is optimized in the low temperature drying tank 110.

Referring again to FIG. 8, the low temperature drying unit 100 includes a load cell 172, a sludge measurement unit 174, an air feed stage measurement unit 176, and an air discharge stage measurement unit 178.

The load cell 172 is installed to detect a change in the weight of the organic waste charged in the inner cylinder 112 of the low temperature drying tank 110 in real time or at predetermined time intervals. The load cell 172 provides the control unit 130 with the measured value of the purified sludge.

The control unit 130 calculates the drying curve of the organic waste with the weight change amount of the purified sludge supplied from the load cell 172. The temperature and the flow rate of the dry air supplied to the low temperature drying tank 110 are controlled according to the slope of the drying curve.

Figure 9 shows the drying curves of the organic waste. For example, the control unit 130 compares the slope of the calculated drying curve with the slope of the predetermined drying curve (optimized drying curve). If the slope is large, the control unit 130 determines that the drying amount over time is excessive, Or by reducing the flow rate, thereby reducing excessive energy waste. If the inclination is small, it is determined that the drying amount is insufficient over time, and the drying target amount can be adjusted by increasing the temperature of the drying air or increasing the flow amount.

On the other hand, the sludge measuring unit 174 checks the temperature and humidity of the organic waste charged in the inner cylinder 112 of the low-temperature drying tank and provides it to the controller 130.

The control unit 130 controls the air supply member 120 and the waste heat treatment unit 380 so that the temperature of the organic waste is maintained at 90-99 占 폚. For example, when the temperature of the organic waste is checked to be lower than a preset temperature (for example, 95 ° C), the control unit 130 increases the drying air temperature of the air supply member 120 or opens the waste heat treatment unit 380 The waste heat is supplied to the heat exchange space 118 of the low temperature drying tank 110 so that the temperature of the inner tube 112 is supplementarily increased to compensate the temperature of the organic waste. Conversely, when the temperature of the organic waste is checked to be higher than a predetermined temperature (for example, 95 ° C), the drying air temperature of the air supply member 120 is lowered or the supply of waste heat to the heat exchange space 118 is cut off Decrease the temperature of the organic waste.

The air supply end measurement unit 176 checks the temperature and humidity of the dry air supplied to the low temperature drying tank 110. The air discharge end measurement unit 178 measures the temperature of the dry air flowing out from the low temperature drying tank 110 , And humidity. The temperature and humidity of the dry air thus checked is provided to the control unit 130.

The control unit 130 compares the dry air temperature and humidity of the air supply side measurement unit 176 and the air discharge side measurement unit 178 to calculate the amount of water separation from the organic waste, 120).

That is, the present invention calculates the amount of moisture evaporated from the organic waste by dry air based on the temperature and humidity of the air discharged from the low temperature drying tank 110, and determines the flow rate, temperature, humidity It is possible to predict and control the amount of deviation of target moisture.

Although not shown, the low temperature drying unit 100 may further include a dehumidifying unit. The dehumidifying means is installed between the blower 124 of the air supply member 120 and the heater 122 to remove moisture from the air supplied to the heater 122 and provide it to the heater 122. The dehumidifying means is not limited to any particular structure, as long as it is a structure commonly used in the art. For example, it may have a porous pellet-like structure, and it may be a structure that adsorbs moisture particles of air passing through the inner hole or space to separate air and moisture.

The above-described organic waste disposal apparatus and method can also be applied to sewage sludge treatment. However, in the treatment of sewage sludge, the temperature distribution during high temperature drying may be 300 to 400 degrees.

1 to 5, the transfer unit 200 is for transferring the organic waste (dry matter) dried in each of the low temperature drying tanks 110 to the high temperature drying unit 300, Two drying conveying conveyors 210 corresponding to the low temperature drying tanks 110 and an organic waste disposed at the end of the two drying conveying conveyors 210 and provided from the two drying conveying conveyors 210 And an integrated charging conveyor 240 for charging the high temperature drying chamber 310 of the high temperature drying unit 300.

The high temperature drying unit 300 includes a high temperature drying chamber 310, a cylindrical chamber 320, a high temperature drying heater 330, and a waste heat treatment unit 380.

The high temperature drying chamber 310 is provided with a cylindrical chamber 320 in which a transfer screw 324 is coupled. The transfer screw 324 may be provided on the inner surface of the cylindrical chamber 320. A first opening is formed at one end of the cylindrical chamber 320 to receive the organic waste (dried powder) from the transfer unit 200 and a second opening is formed at the other end to discharge the organic waste discharged at a high temperature.

The cylindrical chamber 320 is rotatably supported at both ends by a support bearing 340, and the cylindrical chamber 320 is connected to the rotation driving device 350 and rotated. The cylindrical chamber 320 may be made of a metal or alloy material having a higher melting point than the high temperature drying temperature of the organic waste. The high temperature drying temperature may be 500-1000 < 0 > C. If the high-temperature drying temperature is less than 500 ° C, there is a problem that the high-temperature drying is not sufficiently performed, and if it exceeds 1000 ° C, energy is wasted.

The high temperature drying heaters 330 are installed adjacent to the lower end of the cylindrical chamber 320. The high temperature drying heaters 330 may be electric furnace type heaters.

Organic wastes (dry matter) introduced into the cylindrical chamber 320 are subjected to high temperature drying treatment by the high temperature drying heaters 330 while passing through the cylindrical chamber 320, and then discharged to the yard 400.

The waste heat treatment unit 380 uses the waste heat of the high temperature drying unit to maintain the temperature of the low temperature drying tank. The waste heat treatment unit 380 includes a waste heat supply line 382 connected to the high temperature drying chamber 310 and the other end connected to the low temperature drying tank 110. The waste heat supply line 382 includes an open / Respectively.

FIG. 6 is a table showing the processing time table in the low-temperature drying tanks, and FIG. 7 is a process diagram of the organic waste treatment facility shown in FIG.

6 and 7, a method of treating organic waste in an organic waste treatment facility is as follows.

The organic waste collected from the organic waste generation source and transported by the transportation vehicle is stored in the hopper unit 900. The organic waste stored in the hopper unit 900 is transported to the low temperature drying unit 100 through the supply unit 800. The supply unit 800 sequentially supplies the organic wastes corresponding to the throughput (for example, 8.4 t) once to each of the six low temperature drying tanks 110. The organic waste is supplied to the low temperature drying tanks 110 with a time difference of 3 hours. In each low temperature drying tank 110, the organic waste input time (1 hour) -> the drying time (19 hours) Time table (4 hours) is provided. Here, the organic waste discharge time is a time (4 hours) required to dry the organic waste (2.5 t) dried in one cryogenic drying tank (110) at high temperature in the high temperature drying unit (300) 110 are supplied to the high-temperature drying unit 300 sequentially for 4 hours and then subjected to high-temperature drying treatment. For example, when organic waste is discharged from the first low temperature drying tank 110, organic wastes that have been successively dried in the low temperature drying tank 110 are supplied to the high temperature drying unit 300, Temperature drying tanks 110, the high-temperature drying unit 300 continuously performs the organic waste high-temperature drying process without waiting time. On the other hand, the evaporated water generated in the low-temperature drying process and the high-temperature drying process can be returned to the source of the organic waste.

10 is a view showing another example of the organic waste treatment facility.

As shown in FIG. 10, organic wastes generated in a water purification plant, which is an organic waste generation site, and in a wastewater treatment plant, are subjected to moisture removal through low temperature drying and high temperature drying in the organic waste treatment facility 10. Since the evaporated water generated in the low-temperature drying unit 100 and the high-temperature drying unit 300, in which the moisture of the organic waste is removed, is contaminated, it is supplied to the organic waste generation source through the evaporated water return unit 20 again. To this end, the evaporated water return unit 20 includes a collecting line 22 for collecting water vapor generated from the low temperature drying unit 100 and the high temperature drying unit 300, a condenser 22 for condensing the water vapor collected in the collecting line 22, (24) and a return line (26) for returning the condensed water condensed in the condenser (26) to the source of organic waste. As an example, the return line 26 may be connected to the primary settler in the water treatment process.

In case of constructing the organic waste disposal facility 10 for recycling the sludge generated in the water treatment plant (or the sewage treatment plant), it is inevitably necessary to treat the water vapor generated in the sludge drying process. Since this water vapor causes a polluted water outflow problem when it is treated by a general method, it is necessary to add a separate environment consignment facility. However, the evaporated water return unit 20 is further implemented as in the present embodiment, So that the generation of additional sewage can be fundamentally cut off and the process can be simplified.

11 is a view showing a modified example of the organic waste supply and discharge system in the low temperature drying tank.

As shown in FIG. 11, in the low-temperature drying tank, it is possible to proceed with a constant treatment process by adjusting the input amount and the emission amount for the organic waste at a predetermined time by utilizing the time curve according to the wind quantity, wind pressure and temperature. For example, about one-third (a certain amount) of the total capacity of the low-temperature drying tank is injected at a constant time. In this process, when the first organic wastes are completely dried, the first organic wastes are discharged. When the first organic waste discharged from the low temperature drying tank is discharged, the fourth organic waste is put into the low temperature drying tank by the discharge amount. By performing this process in sequence, the input and discharge of the organic waste in the low temperature drying tank can be made.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

100: low temperature drying unit 200:
300: high temperature drying unit 800:
900: hopper portion

Claims (11)

A method of treating organic wastes comprising:
Transporting the organic waste collected from the source of organic waste to the hopper section;
Supplying organic wastes stored in the hopper unit to each of the low temperature drying tanks of the low temperature drying unit;
Cryogenic drying of the organic waste with low temperature dry air in each of the low temperature drying tanks;
Transferring the dried organic waste in each of the low temperature drying tanks to the high temperature drying unit; And
Drying the organic waste that has been dried in the high-temperature drying unit at a high temperature;
The drying step sequentially supplies organic wastes corresponding to a throughput to each of the low temperature drying tanks at a predetermined time interval. The drying step sets a time table based on organic wastes input time, drying time and organic wastes discharge time, Waste is supplied sequentially,
The low temperature drying step
A drying curve of the organic waste is calculated by measuring a weight change amount of the organic waste charged in the low temperature drying tank, and the slope of the predetermined drying curve is compared with the slope of the calculated drying curve to be supplied to the low temperature drying tank Controlling the flow rate of the low temperature dry air,
The organic waste dried in the low-temperature drying tank is temporarily stored in a dry powder storage tank connected to the low-temperature drying tank through a slide gate, and the high-temperature drying process is continuously performed on the organic waste without waiting time in the high- Wherein the dried organic wastes temporarily stored in the dry branch storage tank are supplied in an amount required by the high temperature drying unit through a fixed amount discharge device installed in the dry branch storage tank. delete delete delete delete The method according to claim 1,
Wherein the water vapor generated in the low-temperature drying step and the high-temperature drying step is returned to the organic waste generation source through the evaporated water return unit. delete The method according to claim 1,
In the drying step
Wherein the organic waste discharge time corresponds to a time required to dry the organic waste that has been dried in one low-temperature drying tank at a high-temperature drying unit, and to dry the organic waste corresponding to the one-time treated amount. The method according to claim 1,
Wherein the low temperature treatment step is a step of supplying the low temperature dry air at a temperature of 100 ° C or lower to the inner cylinder of the low temperature drying tank filled with the organic waste and drying the organic waste by an evaporation action by dry air. delete 10. The method of claim 9,
The low temperature drying step
Wherein the low temperature drying tank is preheated by using waste heat generated in the high temperature drying step when the temperature of the organic waste charged in the low temperature drying tank is lower than a preset temperature.

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