Sludge treatment unit and sludge recycling apparatus including the same

Abstract

To provide a sludge treatment apparatus which is provided in a sludge recycling apparatus for recycling sludge discharged from a garbage treatment apparatus and treats the sludge flowing in from the garbage treatment apparatus.SOLUTION: A housing having a predetermined space formed therein, a plurality of vent holes formed therein to discharge water therein to the outside, and a sludge input hole formed therein to receive the sludge, the sludge input hole having a through-hole shape, a dewatered sludge outlet provided at the other side of the sludge input hole to discharge dewatered sludge, a shaft body part provided in the housing, and a blade spirally provided on an outer circumferential surface of the shaft body part, A shaft rotating by receiving a rotational force from the motor to move the sludge from the sludge inlet toward the dewatered sludge outlet.SELECTED DRAWING: Figure 18

Description

[Technical Field]

[0001] The present invention relates to a sludge treatment device and a sludge recycling device including the same. [Background technology]

[0002] As interest in reducing environmental pollutants increases, methods for disposing of food waste and other waste are being improved. Research is being conducted on composting as one method of disposing of food waste. Only a very small portion of food waste generated in Korea is recycled into livestock feed or compost, with the majority being disposed of by landfilling or other methods. This type of landfilling not only causes environmental pollution through issues such as leachate, but also has adverse effects on human health through foul odors and pathogens, and may lead to serious problems such as contamination of drinking water sources.

[0003] To solve these problems, food waste reduction machines are used as food waste treatment devices, and various methods are used as the reduction methods for these waste reduction machines, such as drying, fermentation, fermentation drying, carbonization drying, composting, submerged microbial fermentation (microbial fermentation), and dehydration. However, even if food waste passes through such treatment devices, problems can arise in that the sludge discharged after treatment has a high salt content, making it difficult to use as livestock feed, and has an excessively high or low moisture content, making it difficult to use as compost. For example, even if food waste is treated using the submerged microbial fermentation method, the sludge (solid material) discharged as the treatment result is still discarded as waste because it cannot be used as compost or feed due to its high salt content.

[0004] Meanwhile, as an example of utilizing food waste, the present applicant has proposed a sludge recycling device as shown in Figure 1. However, in this case, the sludge processed in the sludge treatment unit may contain a large amount of water when it is discharged to the second sludge treatment unit, which may result in a problem of a slight decrease in sludge drying efficiency. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Republic of Korea Registered Patent Publication No. 10-1031403 Summary of the Invention [Problem to be solved by the invention]

[0006] The present invention aims to improve the structure of a sludge recycling device to reduce the salt content of sludge discharged from a food waste processing device, maintain the moisture content within an appropriate range, and increase its usability as compost or animal feed.

[0007] In addition, the present invention provides a sludge treatment device that can prevent water from being discharged to the next process during the sludge treatment process.

[0008] The present invention also provides a means for improving the directionality of the screw when it rotates, thereby improving the movement of sludge and increasing the drainage force.

[0009] The present invention also provides a means for shortening the manufacturing process to reduce manufacturing costs, and a means for killing microorganisms in sludge and drying the sludge. [Means for solving the problem]

[0010] A sludge treatment device is provided in a sludge recycling device for recycling sludge discharged from a food waste treatment device, and treats the sludge that flows in from the food waste treatment device. The sludge treatment device according to the present invention includes a housing that forms a certain amount of space inside, has a plurality of drainage holes formed therein to allow water inside to be discharged to the outside, and is formed with a sludge inlet that is a hole that penetrates from the inside to the outside and receives the sludge; a dewatered sludge outlet provided on the other side of the sludge inlet and through which dewatered sludge is discharged; and a shaft that has a shaft body provided inside the housing and a blade provided in a spiral shape on the outer periphery of the shaft body, and that rotates when rotational force is transmitted from a motor to move sludge from the sludge inlet toward the dewatered sludge outlet.

[0011] The hole may also be formed as a rectangular hole in the shape of a letter "1".

[0012] The longitudinal direction of the holes may be formed and arranged parallel to the longitudinal direction of the housing.

[0013] In addition, the housing may have a non-porous region within a certain length from the end of the dewatered sludge outlet side, in which the porous region is not formed.

[0014] In addition, a tubular sludge inlet may be connected to the sludge inlet hole.

[0015] The shaft body may be formed so that its diameter increases from the sludge inlet side to the dewatered sludge outlet side.

[0016] The longitudinal direction of the holes may be formed and arranged in a diagonal line based on the vertical and horizontal directions.

[0017] In addition, the dewatered sludge outlet may be formed to be inclined upward toward the end.

[0018] In addition, the housing may have an overflow hole formed at an upper side thereof, through which water can overflow from inside the housing. [Effects of the Invention]

[0019] According to the sludge recycling device of the present invention, the moisture content of the sludge discharged from the food waste treatment device can be maintained within an appropriate range, and the sludge drying efficiency can be improved by preventing water from being discharged to the next process during the sludge treatment process.

[0020] In addition, the present invention introduces a "I"-shaped perforated mesh case integrated with the housing, which increases the directionality of the screw when it rotates, improving the movement of the sludge and improving drainage. The heat and pressure generated inside the non-perforated area not only increases the drying rate of the sludge, but also kills microorganisms that cause odors, thereby eliminating the cause of the sludge odor. [Brief explanation of the drawings]

[0021] [Figure 1] 1 is a diagram illustrating a method for treating sludge discharged from a food waste treatment device (food waste processor) using a sludge recycling device according to the present invention. [Figure 2] 1 is a block diagram for explaining elements constituting a sludge recycling apparatus according to the present invention. [Figure 3] 1 is a schematic diagram for conceptually explaining a sludge recycling apparatus according to the present invention; [Figure 4] 1 is a schematic diagram illustrating the structure and operation of a first adjusting unit and a second adjusting unit for introducing a composition according to an embodiment of the present invention. [Figure 5] 1A and 1B are a schematic perspective view and a side view of a sludge recycling device according to the present invention; [Figure 6] 3 is a schematic diagram for explaining the structure and operation of a second sludge treatment unit according to the present invention. FIG. [Figure 7] 1 is a schematic diagram for explaining the structure of a plurality of stirring blades according to the present invention. FIG. [Figure 8] 1 is a diagram illustrating the structure and operation of a power transmission unit according to the present invention; [Figure 9] 1 is a view illustrating a structure in which an air injection fan is installed in a sludge recycling apparatus according to the present invention; [Figure 10] 1 is a view illustrating a structure in which an air injection fan is installed in a sludge recycling apparatus according to the present invention; [Figure 11] 1A and 1B are a perspective view and a front view showing an appearance of a sludge treatment device according to an embodiment of the present invention; [Figure 12] 1A and 1B are a perspective view and a front view showing an appearance of a sludge treatment device according to an embodiment of the present invention; [Figure 13] 12A and 12B are a front view and a plan view showing the state in which the perforated mesh case is removed from the sludge treatment device of FIG. 11. [Figure 14] 12A and 12B are a front view and a plan view showing the state in which the perforated mesh case is removed from the sludge treatment device of FIG. 11. [Figure 15] FIG. 13 is a vertical cross-sectional view showing the appearance of the sludge treatment unit of FIG. 12. [Figure 16] FIG. 10 is a development view showing the unfolded appearance of a perforated mesh case according to another embodiment. [Figure 17] FIG. 17 is a front view showing the appearance of a sludge treatment device employing the perforated mesh case of FIG. 16. [Figure 18] 1A to 1C are front views showing sludge treatment devices according to different embodiments. [Figure 19] 1A to 1C are front views showing sludge treatment devices according to different embodiments. [Figure 20] FIG. 20 is a plan view showing the sludge treatment unit of FIG. 19. [Figure 21] FIG. 20 is an exploded view showing the sludge treatment unit of FIG. DETAILED DESCRIPTION OF THE INVENTION

[0022] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. Unless otherwise defined or specified, terms indicating directions used in this description refer to the state shown in the drawings. In addition, the same drawing numbers indicate the same components throughout the embodiments. Meanwhile, the thickness and dimensions of each component shown in the drawings may be exaggerated for the convenience of explanation, and this does not mean that the corresponding dimensions or ratios between components should actually be configured.

[0023] An apparatus for recycling sludge according to an embodiment will be described with reference to Fig. 1. Fig. 1 is a diagram illustrating a method in which the apparatus for recycling sludge according to the present invention treats sludge discharged from a food waste treatment device.

[0024] As shown in FIG. 1, the sludge recycling system 10 may include a food waste treatment device (food waste treatment device 200) and a sludge recycling device 100.

[0025] In the sludge recycling system 10, sludge discharged from the food waste treatment device 200 can be recycled so that it can be used as compost or animal feed through the sludge recycling device 100. The sludge discharged from the food waste treatment device 200 has high salt content and an inappropriate moisture content, making it difficult to use as compost or animal feed. However, when the sludge passes through the sludge recycling device 100, it is dehydrated or desalted, allowing the sludge to be recycled as a resource.

[0026] An embodiment of a sludge recycling apparatus will be described with reference to Figures 2 to 7. Figure 2 is a block diagram illustrating the components of the sludge recycling apparatus according to the present invention, Figure 3 is a schematic diagram conceptually illustrating the sludge recycling apparatus according to the present invention, and Figure 4 is a schematic diagram illustrating the structure and operation of a first and second composition-feeding adjustment unit according to an embodiment of the present invention. Also, Figure 5 is a schematic perspective view (A) and side view (B) of the sludge recycling apparatus according to the present invention, Figure 6 is a schematic diagram illustrating the structure and operation of a second sludge treatment unit according to the present invention, and Figure 7 is a schematic diagram illustrating the structure of multiple agitator blades according to the present invention.

[0027] 2 and 3, the sludge recycling apparatus 100 may include a motor 110, a power transmission unit 120, a sludge treatment unit 130, and a second sludge treatment unit 150. However, the present invention is not limited thereto, and other components may be included in the sludge recycling apparatus 100. For example, as shown in FIG. 2, in another configuration, the apparatus may further include a first composition input adjuster 140, and if the first composition input adjuster 140 is included, the apparatus may further include a second composition input adjuster 141 or a hopper 142. In this case, the second composition input adjuster 141 may be provided at the bottom of the hopper 142.

[0028] In the sludge recycling apparatus 100, the rotational driving force for driving the sludge treatment unit 130, the first adjusting unit for composition input 140, and the second sludge treatment unit 150 may be provided by a motor 110. The rotational driving force of the motor 110 may be transmitted through a power transmission unit 120.

[0029] After the sludge recycling apparatus 100 performs dehydration treatment through the sludge treatment unit 130, it can generate and discharge an agitation result by agitating the dehydrated sludge with an agitation composition through the second sludge treatment unit 150. At this time, the agitation composition can include rice husks and coffee grounds, and the agitation result can be used as compost or animal feed.

[0030] In the sludge recycling apparatus 100, the agitated composition may be introduced into the agitation chamber of the second sludge treatment unit 150 through the hopper 142 and the first composition introduction adjusting unit 140, and if the second composition introduction adjusting unit 141 is included, the agitated composition may be introduced into the agitation chamber of the second sludge treatment unit 150 through the hopper 142, the second composition introduction adjusting unit 141, and the first composition introduction adjusting unit 140. Meanwhile, the agitation chamber may be provided with an air injection fan for injecting external air into the agitation chamber to reduce the moisture content of the agitation result, or microorganisms may be further introduced for fermenting and composting the agitated mixture.

[0031] In the sludge recycling apparatus 100, the sludge treatment unit 130 and the second sludge treatment unit 150 may be rotated solely by the driving force of the motor 110. If the first composition-adding adjusting unit 140 is additionally configured, the sludge treatment unit 130, the first composition-adding adjusting unit 140, and the second sludge treatment unit 150 may all be rotated. That is, the rotational driving of the sludge treatment unit 130, the first composition-adding adjusting unit 140, and the second sludge treatment unit 150 may all be performed by the rotational driving force generated by the motor 110. The driving force of the motor 110 may be transmitted by a power transmission unit 120, and gears or belts may be used as the power transmission means. The power transmission unit 120 may be configured in various ways depending on the arrangement of the sludge treatment unit 130 and the second sludge treatment unit 150, and there are no limitations on the number of gears or the type of power transmission means.

[0032] For example, the power transmission unit 120 may include a first gear 121, a second gear 122, and a third gear 123 for transmitting the rotational driving force generated by the motor 110. The first gear 121 may rotate the sludge treatment unit 130, the second gear 122 may rotate the first composition input adjusting unit 140, and the third gear 123 may rotate the second sludge treatment unit 150, but the number of gears and the type of power transmission means may also be changed and are not limited.

[0033] The sludge treatment device 130 may include a sludge inlet 131 for receiving sludge from the food waste treatment device, a dewatering outlet 132 for discharging water dewatered from the sludge by the rotational driving force transmitted through the first gear 121 or water flowing in from the food waste treatment device, and a dewatered sludge outlet 133 for discharging dewatered sludge. Here, dewatering refers to reducing the water content of the sludge, and desalination of the sludge may also occur simultaneously during the dewatering process. The sludge treatment device 130 in FIG. 3 is shown for conceptual explanation purposes, and the specific configuration and structure of the sludge treatment device 130 according to an embodiment of the present invention will be described later.

[0034] 4, the first adjusting unit 140 for introducing a composition may include an input hole 144 formed away from the center of rotation. The first adjusting unit 140 for introducing a composition may be rotated by a rotational driving force transmitted through the second gear 122, for example, to introduce the stirring composition transmitted through the composition introducing hopper 142 or the second adjusting unit 141 for introducing a composition into the stirring chamber through the periodic rotation and opening / closing of the input hole.

[0035] The second gear 122 may be composed of a left gear and a right gear separated by a partition wall, and these two gears may be rotated on a single rotation axis in contact with the partition wall. The right gear of the second gear 122 and the first composition-injecting adjusting unit 140 may each be a gear-shaped gear so that the vertical rotation of the second gear 122 can become the horizontal rotation of the first composition-injecting adjusting unit 140. That is, the second gear 122 and the first adjusting unit 140 may be mechanically connected using a bevel gear type, or may be connected using various other power transmission methods.

[0036] The second adjusting unit 141 for introducing the composition is installed at the bottom of the hopper 142 and may include one or more holes (holes 145) having different diameters, and the diameter of the hole may be manually selected to adjust the amount of the stirring composition introduced. The holes (second adjusting unit holes 145) formed in the second adjusting unit 141 for introducing the composition have different diameters, so that the amount of the stirring composition introduced can be adjusted, and the diameter of the hole may be manually selected to adjust the amount of the stirring composition introduced.

[0037] Meanwhile, the input hole 144 formed in the first adjusting part 140 for inputting the composition may have the same or different shape as the second adjusting part hole 145, and if they have the same shape, the input hole 144 may be the same size as the hole with the largest diameter among the second adjusting part holes 145.

[0038] The stirring composition may be loaded into a composition supply hopper (142, see FIG. 2) and transferred to the stirring chamber through a second adjusting hole 145 having a selected diameter. The stirring composition that has passed through the second adjusting hole 145 may then be supplied to the stirring chamber by passing through an input hole 144 formed in the first adjusting part 140 for composition supply.

[0039] The second sludge treatment unit 150 may include a plurality of agitating blades 151 for agitating the dewatered sludge or the dewatered sludge and the agitated composition by rotating in the agitation chamber by the rotational driving force transmitted through the third gear 123, a partition 152 for partitioning the agitation chamber, and an agitation result discharge port 153 for discharging the agitation result. In yet another configuration, an air injection fan may be further installed in the agitation chamber of the second sludge treatment unit 150 to reduce the moisture content of the agitation result. This will be further described with reference to FIG. 9.

[0040] The dewatered sludge input from the sludge treatment unit 130 and the agitated composition input through the first composition input adjusting unit 140 can be agitated by a plurality of agitating blades 151 in the agitation chamber of the second sludge treatment unit 150, and can be discharged to the outside of the sludge recycling apparatus 100 through the partition wall 152 and the agitation result discharge port 153.

[0041] As shown in FIG. 5, the sludge recycling apparatus 100 may be separated into a left side portion 411 and a right side portion 412 by a partition wall, and may be separated into an outside stirring chamber portion and an inside stirring chamber portion based on the composition inlet 413. The left side portion 411 may include a motor 110 and a sludge treatment device 130, while the right side portion 412 may include a first composition input adjuster 140 and a second sludge treatment device 150. A hopper (not shown) may be provided above the composition inlet 413, and the lower end of the hopper may additionally include a second composition input adjuster 141 having one or more holes of different sizes, as described above. The first composition input adjuster 140 and the second sludge treatment device 150 may be provided below the composition inlet 413. As shown in FIG. 5(B), the lower part of the stirring chamber of the second sludge treatment device 150 may be circular, reflecting the rotation of the agitating blade 151.

[0042] Referring to FIG. 6, specific structures (A, B, C) in which a plurality of stirring blades 151, partition walls 152, and stirring resultant discharge port 153 constituting the second sludge treatment unit 150 are formed can be exemplarily illustrated.

[0043] 6A, multiple agitating blades 151 may be formed on one shaft, and the shaft may receive the rotational driving force of the motor 110 via the third gear 123. The shaft may pass through a partition wall 152, and multiple agitating blades 151 may be formed on both the left and right sides of the partition wall 152.

[0044] 6(B), the partition 152 may include a heating wire pattern 1521. Specifically, the partition 152 may include a heating wire pattern 1521 for adjusting the temperature of the mixture of desalted sludge and agitated composition during agitation, and the heating wire pattern 1521 may be provided in the space between the left and right sides of the partition 152 by inserting an aluminum tube inside. The heating wire pattern 1521 formed on the partition 152 may maintain the temperature of the mixture of desalted sludge and agitated composition within a desired range, thereby allowing for more efficient microbial fermentation / composting.

[0045] 6(B), the partition 152 may include a plurality of partition holes 1523. Specifically, the partition 152 may include a plurality of partition holes 1523 for moving the mixture through the partition, and the plurality of partition holes 1523 may be located on the path through which the lower half of each stirring blade 151 passes, and the partition 152 may be formed to have the same height as the maximum height through which the center of each stirring blade 151 passes.

[0046] Since the center positions of the plurality of partition holes can be positioned on the path through which the lower half of the agitating blade 151 passes, the mixture can pass through the plurality of partition holes more effectively to the other side by the agitating blade 151. Also, if the height of the partition 152 is formed to be the same as the maximum height through which the center of the agitating blade 151 passes, it may be possible to efficiently pass the mixture over the partition 152 while smoothly agitating it.

[0047] 6(C), the position where the agitation result outlet 153 is formed may also be determined in consideration of the path of the agitating blade 151. That is, when the agitation result outlet 153 is formed at a position corresponding to the upper half of the agitating blade 151, the efficiency of discharging the agitation result through the agitation result outlet 153 may be improved.

[0048] 7, the plurality of stirring blades 151 can include first stirring blade 151a to sixth stirring blade 151f. The first stirring blade 151a to third stirring blade 151c can be positioned on the input side on the left side of the partition wall 152, and the fourth stirring blade 151d to sixth stirring blade 151f can be positioned on the discharge side on the right side of the partition wall 152.

[0049] The third agitating blade 151c and the sixth agitating blade 151f are positioned adjacent to the partition wall 152 and the agitation result discharge port 153, and therefore may be formed in a different shape from the remaining agitating blades 151a, 151b, 151d, and 151e. That is, the plurality of agitating blades 151 may include first to third agitating blades 151a, 151b, and 151c formed on the inlet side of the agitation chamber partitioned by the partition wall 152, and fourth to sixth agitating blades 151d, 151e, and 151f formed on the outlet side of the agitation chamber partitioned by the partition wall 152, and the third agitating blade 151c on the inlet side, which is positioned adjacent to the partition wall 152, and the sixth agitating blade 151f on the outlet side, which is positioned adjacent to the agitation result discharge port 153, may have a curvature greater than that of the remaining agitating blades 151a, 151b, 151d, and 151e.

[0050] As described above, by setting the curvature of the third agitating blade 151c and the sixth agitating blade 151f to be larger, they have a more concave and deeply carved structure, so the process of moving the mixture of desalted sludge and agitation composition through the partition wall 152 and discharging the agitation result through the agitation result discharge port 153 can be carried out more smoothly.

[0051] As shown in FIG. 8, the rotational driving force generated by the motor 110 may be transmitted to one or more meshed gears of the power transmission unit 120. For example, the rotational driving force generated by the motor 110 may be transmitted to the meshed first gear 121 and third gear 123 of the power transmission unit 120. If the first composition input adjuster 140 is included, the rotational driving force generated by the motor 110 may be transmitted to the meshed first gear 121, second gear 122, and third gear 123 of the power transmission unit 120. In this case, the first gear 121 and the second gear 122 rotate at different rotational speeds due to the same rotational driving force, allowing the demineralized sludge and the composition to be mixed at the same mixing ratio. In addition, the amount of mixing can be adjusted by selectively varying the size of the holes in the second composition input adjuster 141.

[0052] However, this structure is merely one example, and various power transmission structures may be implemented depending on the arrangement and direction of other components, and there is no particular limitation thereon.

[0053] Another embodiment of a sludge recycling apparatus will be described with reference to Figures 9 and 10. Figures 9 and 10 are views illustrating the structure of an air injection fan installed in the sludge recycling apparatus according to the present invention. The air injection fan can be installed in place of the first composition input adjuster or in addition to the first composition input adjuster.

[0054] 9 and 10, the sludge recycling apparatus 100 may further include an air injection fan 160. Compared to the sludge recycling apparatus 100 described above with reference to FIGS. 1 to 8, the sludge recycling apparatus 100 may not have the second gear 122, the first composition feeding adjuster 140, the second composition feeding adjuster 141, and the hopper 142, but may have the air injection fan 160. Alternatively, the sludge recycling apparatus 100 may have the second gear 122, the first composition feeding adjuster 140, the second composition feeding adjuster 141, and the hopper 142, and may also have the air injection fan 160.

[0055] The air injection fan 160 may inject external air to dry the agitation result discharged through the agitation result discharge port 153. Here, drying refers to reducing the moisture content of the agitation result, not to a state where the moisture content is zero. Therefore, reducing the moisture content of the agitation result to 40% or less may also be considered drying. The air injection fan 160 may create an air flow between the agitation chamber and the outside, thereby drying the agitation result present inside the agitation chamber (reducing the moisture content).

[0056] Meanwhile, the sludge recycling apparatus 100 may further include an air exhaust fan (not shown) in addition to the air injection fan 160 .

[0057] The air exhaust fan may be used to exhaust air from the stirring chamber to the outside so that the moisture content of the agitation result discharged through the agitation result outlet 153 is 40% or less. For example, the temperature inside the stirring chamber may be somewhat high due to the fermentation process and heat rays, and in order to reduce the moisture content in such a hot and humid environment, the air inlet fan 160 and the air exhaust fan may be operated to circulate air in opposite directions.

[0058] A sludge treatment device 130 according to one embodiment will be described with reference to Figures 11 to 15. Figures 11 and 12 are a perspective view and a front view showing the appearance of the sludge treatment device according to one embodiment, Figures 13 and 14 are a front view and a plan view showing the appearance of the sludge treatment device in Figure 11 with the perforated mesh case removed, and Figure 15 is a vertical cross-sectional view showing the appearance of the sludge treatment device in Figure 12.

[0059] The sludge treatment unit 130 includes housings 137 , 138 , 136 , a shaft 135 , a support 139 and a sludge inlet 131 .

[0060] The housing includes a first sludge treatment device case 137, a second sludge treatment device case 138, and a perforated mesh case 136. The housing forms the outer shape of the sludge treatment device 130 and defines a certain amount of space inside. The first sludge treatment device case 137, the second sludge treatment device case 138, and the perforated mesh case 136 can be formed in various ways depending on manufacturing convenience and selection at the design stage, and may all be formed as an integrated unit; this does not mean that they are physically separate. In other words, the perforated mesh case 136 can be implemented by forming perforations in parts of the first sludge treatment device case 137 and the second sludge treatment device case 138.

[0061] A sludge inlet 131 is provided at the top of the sludge treatment device second case 138, and sludge or dilution water flowing in from the food waste treatment device through the sludge inlet 131 flows into the internal space formed by the sludge treatment device first case 137, the sludge treatment device second case 138, and the perforated mesh case 136.

[0062] As shown in Figures 13 and 14, an overflow hole 1381 is formed at the top of the sludge treatment device second case 138. Dilution water flowing into the inside and water derived from the sludge overflow through the overflow hole 1381. For this reason, it is preferable that the lowest point of the overflow hole 1381 is formed lower than the lowest point of the dewatered sludge discharge port 133. Conversely, the lowest point of the dewatered sludge discharge port 133 should be formed higher than the lowest point of the overflow hole 1381 so that water is discharged first through the overflow hole 1381. Preferably, the dewatered sludge discharge port 133 is provided at the upper end. Furthermore, the dewatered sludge discharge port 133 is formed to slope upward in the discharge direction so that the slope prevents water from being discharged even if it moves toward the dewatered sludge discharge port 133. This configuration can maximally prevent the dilution water flowing in from the food waste treatment device and the water derived from the sludge from flowing into the second sludge treatment device together with the dewatered sludge through the dewatered sludge discharge port 133.

[0063] The perforated mesh case 136 has a plurality of perforations formed therein, allowing the dilution water flowing in from the food waste treatment device and water derived from the sludge to be discharged to the outside. At this time, if the perforations are clogged or a large amount of dilution water temporarily flows in, the water can be discharged through the above-mentioned overflow hole 1381. The water discharged to the outside through the perforated mesh case 136 and the water discharged through the overflow hole 1381 can be discharged to the outside through the above-mentioned dehydration discharge port (132, see FIG. 3).

[0064] The shaft 135 operates as a rotation center using a bearing 1395, etc., and includes a shaft body 1351 and blades 1353. As shown in Figure 13, the shaft body 1351 is provided in the internal space formed by the first sludge treatment device case 137, the second sludge treatment device case 138, and the perforated mesh case 136. The diameter of the shaft body 1351 increases from the sludge inlet 131 toward the dewatered sludge discharge outlet 133, and the blades 1353 are spirally shaped to move the sludge toward the dewatered sludge discharge outlet 133 when rotating. That is, the shaft body 1351 and the blades 1353 are screw-shaped.

[0065] Sludge and dilution water (salt-diluted water) discharged from the food waste treatment device 200 are input through the sludge input port 131. The sludge is dehydrated inside the first sludge treatment device case 137 and the second sludge treatment device case 138. The dewatered sludge can be discharged through the dewatered sludge outlet 133 into the stirring chamber of the second sludge treatment unit 150 .

[0066] The support 139 can be fixed to an external structure to support the weight of the sludge treatment unit 130 .

[0067] On the other hand, there is a problem that the drying efficiency of the sludge decreases if water is also discharged through the dewatered sludge outlet 133. The sludge treatment device 130 according to this embodiment can improve the drying efficiency of the sludge due to the above-mentioned structural features.

[0068] A sludge treatment device according to another embodiment will be described with reference to Figures 16 and 17. Figure 16 is a development view showing the appearance of a perforated mesh case according to another embodiment developed on a plane, and Figure 17 is a front view showing the appearance of a sludge treatment device employing the perforated mesh case of Figure 16.

[0069] 16, the holes formed in the hole mesh case 136a may be formed as "I"-shaped holes 1361a. The holes 1361a may be formed in a diagonal or horizontal "I"-shaped manner in the area excluding the through hole 1363 for the sludge inlet.

[0070] By forming the "1"-shaped holes 1361a in the hole mesh case 136a in this way, drainage can be improved and sludge mobility can be improved.

[0071] A sludge treatment device according to another embodiment will be described with reference to Figures 18 to 21. Figures 18 and 19 are front views showing sludge treatment devices according to different embodiments, Figure 20 is a plan view showing the sludge treatment device of Figure 19, and Figure 21 is an exploded view showing the sludge treatment device of Figure 19.

[0072] In the previous embodiment, the sludge treatment unit has a dual structure consisting of a perforated mesh case (136a; see FIG. 17) and a housing (137, 138; see FIG. 17). However, the sludge treatment unit 130b of this embodiment differs from the previous embodiment in that it is formed directly and integrally with the housing 137a. That is, instead of providing a separate perforated mesh case, a "I"-shaped perforation 1361b is formed in the housing itself, allowing the housing 137a to be manufactured as an integral part of the perforated mesh case. This structure reduces the number of manufacturing processes and has the effect of reducing manufacturing costs.

[0073] In the sludge treatment device 130b according to this embodiment, the "I"-shaped holes 1361b can be formed so that they are arranged in a "I" shape in the longitudinal direction of the housing 137a (the direction in which the sludge moves). If the hole mesh is circular, clogging can easily occur. On the other hand, when formed in a "I" shape, the "I"-shaped holes 1361b are formed long in the direction in which the sludge moves, which has the effect of preventing clogging of the hole mesh.

[0074] Furthermore, it is preferable that the vent hole region where the "I"-shaped vent holes 1361b are formed is not formed all the way to the end of the housing on the discharge port 133a side, but rather that the "I"-shaped vent holes 1361b are not formed in a region within a certain distance from the end. Inside such a non-vent hole region 1365, heat and pressure are generated as the sludge is compressed by the rotation of the shaft. The heat and pressure generated inside the non-vent hole region not only promotes sludge drying, but also has the effect of eliminating the cause of the sludge odor by killing microorganisms that cause bad odors.

[0075] In addition, the dewatered sludge outlet 133a according to this embodiment is formed to be inclined upward toward the end, thereby preventing water from leaking out of the sludge outlet.

[0076] The sludge treatment unit 130b according to this embodiment may have a sludge inlet 131a formed in the form of a connecting pipe as shown in Figure 18, or may have a sludge inlet hole 1311 formed in the form of a hole connected to the inside of the housing without a connecting pipe like the sludge inlet 131a as shown in Figure 19. That is, the sludge inlet hole 1311, which is a hole that penetrates from the inside to the outside, may be formed in the housing to receive sludge from the food treatment device. The sludge inlet hole 1311 may be connected to another pipe for introducing sludge.

[0077] Other components are similar to those of the previously described embodiment. For example, shaft 135 operates as a rotation center using bearings 1395 and includes shaft body 1351 and blades 1353. Shaft body 1351 is provided in the interior space of housing 137a. Shaft body 1351 is formed so that its diameter increases from sludge inlet 1311 toward dewatered sludge outlet 133a, and blades 1353 are formed in a spiral shape and act to move sludge toward dewatered sludge outlet 133a when rotated. That is, shaft body 1351 and blades 1353 are formed in a screw shape.

[0078] Although the preferred embodiments of the present invention have been described above, the technical idea of ​​the present invention is not limited to the above-described preferred embodiments, and can be embodied in various ways without departing from the technical idea of ​​the present invention embodied in the claims. [Explanation of symbols]

[0079] 130, 130a, 130b: Sludge treatment unit 131: Sludge inlet 1311: Sludge inlet 132: Dehydration outlet 133, 133a: Dewatered sludge outlet 135: Shaft 1351: Shaft body 1353: Blade 136, 136a: Perforated mesh case 137a: (Integrated) Housing 1361a, 1361b: "Ichi"-shaped holes 1365: Non-punched area 1381: Overflow Hall

Claims

1. A sludge treatment device that is provided in a sludge recycling device for recycling sludge discharged from a food waste treatment device and treats sludge that flows in from the food waste treatment device, a housing having a certain space formed therein, a plurality of drain holes formed therein so that the water inside can be discharged to the outside, and a sludge input hole formed therein, which is a hole shaped like a through hole from the inside to the outside, for receiving the sludge; a dewatered sludge discharge port provided on the other side of the sludge inlet and through which dewatered sludge is discharged; and a shaft including a shaft body provided inside the housing and a blade provided in a spiral shape on an outer circumferential surface of the shaft body, the shaft being rotated by a rotational force transmitted from a motor to move the sludge from the sludge inlet toward the dewatered sludge outlet; A sludge treatment device characterized by:

2. The hole is formed as a rectangular hole in the shape of a letter "1". The sludge treatment device according to claim 1 .

3. The longitudinal direction of the holes is formed and arranged parallel to the longitudinal direction of the housing. The sludge treatment device according to claim 2 .

4. The housing has a non-perforated area where the perforations are not formed within a certain length from the end of the dewatered sludge outlet side. The sludge treatment device according to claim 1 .

5. The shaft body is formed so that its diameter increases from the sludge inlet side to the dewatered sludge outlet side. The sludge treatment device according to claim 1 .

6. The longitudinal direction of the holes is formed and arranged in a diagonal line based on the vertical and horizontal directions. The sludge treatment device according to claim 1 .

7. The dewatered sludge outlet is formed to be inclined upward toward the end. The sludge treatment device according to claim 1 .

8. The housing has an overflow hole formed on the upper side thereof, which allows water to overflow from inside the housing. The sludge treatment device according to claim 1 .

9. A tubular sludge inlet is connected to the sludge inlet hole. The sludge treatment device according to claim 1 .

10. A sludge recycling device for recycling sludge discharged from a food waste processing device, A sludge treatment device according to any one of claims 1 to 9; a second sludge treatment unit that agitates and dries the sludge flowing in from the sludge treatment unit and discharges the agitation resultant; and a motor for powering said sludge treatment section and said second sludge treatment section; A sludge recycling device characterized by:

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