Sludge treatment device

Abstract

To provide a sludge treatment device that prevents clogging and can continuously perform separation processing of mud and foreign matters such as grass while having a simple structure.SOLUTION: A sludge treatment device 1 that separates mud from other foreign matters in sludge, comprises a cylindrical rotating body 4 which has an opening 2 in a portion of its outer circumference. The rotating body 4 is inclined relative to the horizontal direction and includes: a sludge introduction unit 5 on a rotating body end on the inclined upper side; and a foreign matter discharge unit 6 on the rotating body end on the inclined lower side. The opening 2 consists of at least two or more mesh sections 3A, 3B arranged along the cylindrical axial direction of the rotating body 4. The aperture of the mesh section 3A on the inclined upper side is smaller than the aperture of the mesh section 3B on the inclined lower side. The mud X included in the sludge Z introduced from the sludge introduction unit 5 is discharged to the outside of the rotating body 4 from the aperture of the mesh section. The foreign matters Y that are not discharged to the outside through the mesh section are discharged from the foreign matter discharge unit 6.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a sludge treatment apparatus for separating and treating wastewater sludge into mud and impurities such as grass and plastic dust. [Background technology]

[0002] Drains and sewer pipes managed by local governments are filled with wastewater from roads and buildings, from homes and businesses, and from agricultural wastewater, and in addition to mud, impurities such as grass and plastic dust accumulate and become wastewater sludge. If left unattended, wastewater sludge will cause problems with drainage, so it is regularly cleaned by local governments using manual efforts and vehicles such as high-pressure cleaners and sludge suction trucks.

[0003] Methods for treating collected sludge include mixing it with solidifying materials such as cement at a recycling facility and solidifying it to produce materials, or drying and fermenting it to compost it to produce fertilizer. In the case of solidification, the wastewater sludge is solidified, stabilizing the waste and reducing its volume, while in the case of composting, the decomposition and stabilization of organic matter is promoted, allowing it to be reused as useful fertilizer. In addition, wastewater sludge is incinerated at high temperatures at incineration facilities to burn organic matter and significantly reduce its volume, or it is buried on the coast or underground.

[0004] Here, since the wastewater sludge contains impurities other than mud, a process to remove these impurities is carried out as a preliminary step to each of the above processes, if necessary. Examples of such processes include filtration, sedimentation, and flotation. Filtration is a method of capturing and separating solids using a filter material that allows sludge to pass through. Common filter materials include sand, coal, cloth, netting, and paper. Filtration separation devices such as drum filters that use metal mesh cylinders may be used to separate impurities from sludge. Sedimentation is a method in which sludge is held in a container or poured into a settling tank and left to stand for a sufficient amount of time. Flotation is a method of separating solids in sludge by buoyancy. Flotation uses a special flotation device that floats solids with a specific buoyancy (plastics and rubber). Sludge is placed in the device, and specific solids rise to the surface using air bubbles and buoyancy, and are separated as floating matter.

[0005] Meanwhile, in the relatively small-scale impurity removal treatment of wastewater sludge by local governments, impurities are sometimes removed manually instead of the continuous mechanical treatment described above. Manual treatment takes a lot of time and requires high labor costs, which may lead to a rise in treatment costs for local governments. In addition, from the perspective of securing workers, the manual work of removing grass and plastic dust from sludge is environmentally and mentally heavy work, and it is not easy to secure the personnel to carry out this task.

[0006] In light of this background, continuous mechanical treatment as described above is being considered for the removal of impurities from wastewater sludge. However, although the sedimentation method allows large-scale treatment at once, it requires time and large equipment, making it unrealistic to introduce it for new treatment on this scale. In addition, the flotation method requires the introduction of dedicated equipment such as a flotation tank and a flotation machine, and also requires experience and expertise to properly adjust parameters such as bubble generation and buoyancy control to obtain optimal separation effects, making it difficult to adopt on this scale, just like the sedimentation method. In contrast to these methods, the filtration method, which uses a filtration separation device such as a drum filter, is difficult to handle large-scale treatment, but it is possible to treat such small-scale treatment with small equipment, so it is promising for adoption.

[0007] As a technique for separating impurities from wastewater sludge using a drum filter, for example, Patent Document 1 is known. In a normal drum filter, a comb-shaped fixed scraper is engaged with a drum screen rotating at a predetermined speed during part of its revolution, and the fixed scraper scrapes off and removes impurities that are clogged in the screen mesh of the drum screen. In this case, the torque applied to the drum increases when removing impurities entangled in the scraper teeth, which may cause overload. In contrast, Patent Document 1 has a structure in which rotating scrapers arranged to engage with the screen mesh of the drum screen are rotated in the same direction and at a circumferential speed of the rotating scraper higher than that of the drum screen to continuously filter sludge, and after the operation of the drum screen is stopped, the rotating scraper is rotated in the reverse direction for a short time to discharge impurities caught between the rotating and fixed scrapers, and then stopped to remove impurities attached to the drum screen and the rotating scraper. This is said to reduce the amount of foreign matter getting caught and retained in the scraper portion, prevent an increase in the rotational torque of the drum screen, and reduce cleaning work. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Japanese Patent Application Publication No. 08-199538 Summary of the Invention [Problem to be solved by the invention]

[0009] However, when a complex mechanism is provided in a filtration / separation device such as a drum filter, the cost of the device becomes high. In particular, when the device is used for removing impurities from wastewater sludge on a relatively small scale by a local government, the high cost of the device becomes a bottleneck. In addition, when the rotation of the filtration / separation device is stopped during operation to remove impurities, depending on the frequency of stopping the operation, the work efficiency may be insufficient.

[0010] Among the impurities contained in wastewater sludge, grass (grass, trees, dead grass, dead wood, etc.) is particularly problematic. Because grass has a long, thin shape such as a line, thread, or string, it is likely to get caught in the filter holes of the screen when using a filtration separation device such as a drum filter, which has uniformly small screen openings, and is likely to cause clogging. In addition, because the grass becomes tangled in a complicated manner, it is not easy to remove it when the device is stopped.

[0011] Some local governments treat not only wastewater from roads and buildings, and wastewater from homes and businesses, but also agricultural wastewater. In this case, agricultural wastewater contains a lot of grass, which is also contained in the wastewater sludge. In addition, agricultural wastewater contains pesticides, fertilizers, and agricultural product residues, so grass may grow in the sediments in drains and catch basins. Therefore, when treating wastewater sludge that contains such agricultural wastewater, the above-mentioned clogging is likely to occur, making cleaning and removal difficult even when the system is stopped.

[0012] The present invention has been made in consideration of the above-mentioned background, and aims to provide a sludge treatment apparatus which has a simple structure, is less prone to clogging, and can continuously separate the mud contained therein from impurities such as grass. [Means for solving the problem]

[0013] The sludge treatment device of the present invention is a sludge treatment device for separating mud from other impurities from sludge, and has a cylindrical rotor having an opening on part of its outer circumference, the rotor being arranged at an incline with respect to the horizontal, with a sludge introduction section at the end of the rotor on the upper side of the incline and an impurity discharge section at the end of the rotor on the lower side of the incline, the opening consisting of at least two or more mesh sections arranged along the cylindrical axial direction of the rotor, the mesh opening of the mesh section on the upper side of the incline of the rotor being smaller than the mesh opening of the mesh section on the lower side of the rotor, and the mud contained in the sludge introduced from the sludge introduction section is discharged to the outside of the rotor through the openings of the mesh sections, and impurities that are not discharged to the outside through the mesh section are discharged from the impurity discharge section.

[0014] The method is characterized in that it has a chain member provided on the inner diameter part of the rotor and comes into contact with at least one of the mesh parts as the rotor rotates. The chain member is provided on at least one of the mesh parts, and a ring-shaped end of the chain member is engaged with a part of the lattice constituting the mesh part.

[0015] The rotor has a partition plate that protrudes toward the inner diameter side of the rotor above the impurity discharge portion, and the partition plate has an impurity passage portion on a part of its circumferential direction.

[0016] The sludge treatment apparatus is characterized in that it has an air supply means for providing an air current from an upwardly sloping side of the rotor to an upwardly sloping side of the rotor, above the sludge introduction section inside the rotor.

[0017] The rotating body does not have a central shaft member, is supported by support rollers in contact with the outer diameter portion of the rotating body, and is rotated by a rotation mechanism provided outside the rotating body. Effect of the Invention

[0018] The sludge treatment device of the present invention has a cylindrical rotor with an opening on a part of the outer circumference, the rotor is arranged at an incline with respect to the horizontal, the sludge inlet is at the end of the rotor on the upper side of the incline, and the impurity discharge is at the end of the rotor on the lower side of the incline, the opening is made of at least two mesh parts arranged along the cylindrical axis direction of the rotor, the mesh opening of the mesh part on the upper side of the incline of the rotor is smaller than the mesh opening of the mesh part on the lower side of the incline of the rotor, so that the sludge continuously introduced into the cylinder is less likely to be discharged to the outside by the mesh part on the upper side of the incline than by the mesh part on the lower side of the incline, and the sludge is sufficiently held on this upper side, so that impurities such as grass and plastic dust tend to float to the upper surface of the sludge, and then the impurities are easily sent to the impurity discharge part on the lower side. In addition, in the mesh part on the lower side of the incline, mud is discharged more quickly than on the upper side, and since the mesh opening is large and there is less impurity, it is less likely to become clogged. As a result, although the structure is simple overall, clogging is less likely to occur, the frequency of maintenance work requiring interruptions is reduced, and sorting processing can be carried out continuously, resulting in excellent work efficiency.

[0019] In addition, since the rotor has a chain-like member that is provided on the inner diameter part and comes into contact with at least one of the mesh parts as the rotor rotates, the chain-like member comes into contact with the inner diameter surface of the mesh part in a tapping or sliding manner, thereby removing impurities such as grass caught in the openings of the mesh part. This makes it possible to easily remove impurities by the rotation of the rotor itself without the need for a dedicated external power source, and prevents clogging of the mesh part even when the impurities include a large amount of grass.

[0020] Furthermore, by providing a chain-shaped member to at least one of the mesh sections and engaging the ring-shaped end of the chain-shaped member with part of the lattice that makes up the mesh section, the ring-shaped end is not completely fixed and can move slightly along the lattice, which prevents impurities such as grass from getting caught at the connection point between the chain-shaped member and the mesh section, and as a result, prevents clogging of the mesh section.

[0021] The rotor has a partition plate that protrudes toward the inner diameter side of the rotor above the impurity discharge section, and the partition plate has a impurity passage section in part of the circumferential direction, thereby preventing sludge from being discharged from the end of the rotor on the inclined downward side of the rotor, and making it easier to guide impurities such as grass and plastic dust that have moved along the top of the sludge from the impurity passage section to the impurity discharge section.

[0022] The sludge treatment device has an air supply means inside the rotor, above the sludge introduction section, that provides an air flow from the upper side of the rotor to the lower side of the rotor.This makes it easier for impurities such as grass and plastic dust that float to the upper surface of the sludge during treatment in the rotor to be carried by the air flow and led to the impurity discharge section.

[0023] The rotating body does not have a central shaft member, but is supported by support rollers that contact the outer diameter of the rotating body and is rotated by a rotation mechanism provided outside the rotating body, so that almost the entire internal space of the rotating body can be effectively used for treating sludge, and impurities such as grass and plastic dust do not get caught in the central shaft member. [Brief description of the drawings]

[0024] [Figure 1] 1 is a side view showing an example of a sludge treatment device of the present invention. [Diagram 2] FIG. 2 is a radial cross-sectional view showing the internal structure of a rotating body. [Diagram 3] FIG. 2 is a partial axial cross-sectional view showing the internal structure of a rotating body. [Figure 4] FIG. 4 is a diagram (radial cross-sectional view) showing a partition plate inside a rotating body. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0025] The sludge treatment device of the present invention is a device for separating mud from other impurities from sludge. Sludge is generated by wastewater treatment and purification activities, and examples of the sludge include wastewater sludge generated in sewage treatment and wastewater purification treatment for wastewater from roads and buildings, and from homes and businesses, industrial sludge generated in wastewater treatment and waste treatment in factories and manufacturing processes, and agricultural sludge generated by irrigation and drainage of farmland, use of pesticides and fertilizers, etc.

[0026] Mud is composed of mud, soil, and sand that adheres to the ground or soil surface. Mud is generated when ground or soil is washed away or transported by rainfall. It is also generated when soil is eroded during the construction and demolition of roads and buildings, agricultural work, etc. Mud contained in wastewater sludge is generated by soil and sand contained in runoff from the ground or roads, dirt on the ground surface, drainage from homes and businesses, and rainwater.

[0027] Further, impurities other than mud contained in wastewater sludge may include, for example, grass, plastic waste (plastic waste, parts of daily necessities, etc.), stones (stones and sand from construction and road construction, etc.), waste paper (waste paper products, parts of daily necessities, etc.), and others (scrap metal, scrap glass, pieces of furniture, etc.). Here, grass, as mentioned above, means grass, trees, dead grass, dead trees, etc., and also includes plant remains such as weeds, tree parts such as wood chips and branches, and remains of dead plants.

[0028] The sludge treatment device of the present invention can be applied to any of the above sludges. In addition, since it has a simple structure and can be introduced at low cost, it is effective to introduce it as an alternative to the impurity removal treatment of wastewater sludge in relatively small-scale municipal facilities where impurities have been removed manually in the past. In particular, since it is less likely to clog, it can be effectively used in wastewater sludge, including agricultural wastewater, that contains a large amount of grass as impurities.

[0029] An example of a sludge treatment apparatus of the present invention will be described with reference to Fig. 1. Fig. 1 is a side view of the sludge treatment apparatus, in which a part of the mud slope and the impurity slope around the rotor have been removed for the purpose of explanation. The sludge treatment device 1 has a cylindrical rotor 4 having an opening 2 on a part of its outer circumference. The rotor 4 is arranged at an incline with respect to the horizontal, and has a sludge introduction section 5 at the end of the rotor on the upper side of the incline and a foreign matter discharge section 6 at the end of the rotor on the lower side of the incline. The foreign matter discharge section 6 is a circular opening at the end of the rotor on the lower side of the incline. The opening 2 is made of a plurality of mesh sections 3A, 3A, 3B, 3B arranged along the cylindrical axial direction of the rotor 4. Mud X contained in the sludge Z introduced from the sludge introduction section 5 is discharged to the outside of the rotor 4 from the openings of each mesh section. The mud X is collected outside the device through a mud slope 10 arranged on the outer periphery of the rotor 4. In addition, foreign matter Y contained in the sludge Z introduced from the sludge introduction section 5 is not discharged to the outside by each mesh section, but is discharged from the foreign matter discharge section 6. The impurities Y are collected outside the device via an impurity slope 11 arranged on the outer circumferential side of the end of the rotor 4.

[0030] The inclination angle of the rotor 4 is set, for example, at 5° to 45°, 5° to 30°, 10° to 30°, or 10° to 20° from the horizontal, taking into consideration the retention time and treatment time of the sludge inside the rotor 4. The gentler the inclination of the rotor, the longer the retention time and treatment time of the sludge inside the rotor 4.

[0031] The rotating body 4 is supported by support rollers 9 in contact with its outer diameter portion, and is rotated by a rotary motor 8 connected to the inclined lower side. The support rollers 9 are supported at two locations, one on the inclined upper side and one on the inclined lower side, as viewed in the cylindrical axial direction. Each cylindrical axial location is supported by two support rollers 9 (see FIG. 2).

[0032] The rotation speed of the rotor 4 is not required to be high because the sludge is retained inside the rotor for a certain period of time for separation, and may be, for example, 10 rpm to 80 rpm, 10 rpm to 60 rpm, 15 rpm to 40 rpm, or 20 rpm to 40 rpm. By rotating the rotor 4 using a rotation mechanism (rotary motor 8) provided outside the rotor 4, there is no central shaft member inside the rotor 4, and almost the entire internal space of the rotor 4 can be effectively used for sludge treatment. The rotation mechanism is not limited to an electric rotary motor, and internal combustion engine power can also be used, and a mechanism using a chain, belt, etc. may also be used.

[0033] The mesh portion constituting the opening 2 will be described. The mesh opening of the mesh portion 3A on the inclined upper side of the rotor 4 is smaller than the mesh opening of the mesh portion 3B on the inclined lower side of the rotor 4. In the present invention, the "mesh opening" means the size of the opening portion of the mesh portion (the area of ​​an opening per one opening). In at least two parts, one part on the inclined upper side and one part on the inclined lower side, in the cylindrical axial direction, the mesh opening on the inclined upper side may be smaller. In the embodiment of FIG. 1, the mesh portion 3A is provided at two parts and the mesh portion 3B is provided at two parts in the cylindrical axial direction, and the mesh portions 3A have the same mesh opening, and the mesh portions 3B have the same mesh opening. In the embodiment of FIG. 1, the mesh portion is divided into a plurality of parts in the same part in the cylindrical axial direction, but the entire outer periphery of the part may be a continuous mesh portion.

[0034] The mesh part is a part having a plurality of openings. The shape of the openings is not particularly limited, and may be a lattice-like opening like the mesh member shown in FIG. 1 or may be a circular opening like punched metal. As described above, the openings may be smaller on the upper side of the inclination in at least two positions, one on the upper side of the inclination and one on the lower side of the inclination, as viewed in the axial direction of the cylinder, and the specific size is not particularly limited and can be adjusted according to the characteristics of the wastewater sludge to be treated. For example, in the case of a lattice-like opening, one side of the lattice is 1 cm to 10 cm, 2 cm to 8 cm, or 3 cm to 8 cm, and in the case of a circular opening, the diameter is 1 cm to 8 cm, 2 cm to 6 cm, or 3 cm to 5 cm. The difference (ratio) in the openings between the upper side of the inclination and the lower side of the inclination is not particularly limited, but for example, the openings on the upper side of the inclination:the openings on the lower side of the inclination=about 1:4 to 3:4.

[0035] To provide a difference in mesh size between the upper and lower sides of the slope, for example, meshes with different mesh sizes can be simply prepared, or on the upper side of the slope, where the mesh size is smaller, mesh members with the same mesh size as the mesh members used on the lower side of the slope can be placed one on top of the other with their lattices shifted. By using this overlapping lattice mesh, when sludge accumulates on the upper side of the slope, three-dimensional unevenness is formed on the inner diameter surface of the mesh, which makes it easier to promote the stirring of the sludge.

[0036] As described above, the sludge treatment device of the present invention has a difference in mesh opening between the upper and lower sides of the inclination, and the mesh opening of the mesh part on the upper side of the rotor is smaller than the mesh opening of the mesh part on the lower side of the rotor. With this structure, the sludge continuously introduced into the rotor is difficult to be discharged to the outside at the position of the mesh part on the upper side of the inclination, and is retained inside the rotor for a sufficient time. During this retention, since the mesh opening is small, only fine mud is easily discharged, and grass, wood, plastic dust, etc. are difficult to discharge. Then, while retained, impurities such as grass and plastic dust are likely to float to the upper surface of the sludge. Once the impurities float to the upper surface of the sludge, they are likely to be sent to the impurity discharge part on the lower side. This is more noticeable when there is forced air such as a blower described later. The sludge is then sent to the position of the mesh part on the lower side of the inclination, but at this point, as described above, there is little impurity and the mesh opening is large, so there is little risk of clogging. In addition, because the mesh is large, mud is discharged more quickly from the upper side than from the lower side. As a result, clogging is less likely to occur overall, and maintenance work due to interruptions is less frequent. This allows the separation of sludge to be carried out continuously, resulting in excellent work efficiency.

[0037] Examples of materials for the rotor and mesh include stainless steel, aluminum, iron, or metal alloys, polyolefin resins such as polypropylene and polyethylene, polyester resins such as polyethylene terephthalate, polycarbonate resins, polyamide resins, and other resins. Since sludge contains a large amount of hard sand, moisture, and chemical components, it is preferable to use stainless steel, which has excellent mechanical strength and corrosion resistance, or iron alloys with corrosion coating. The rotor and mesh may be made of the same material or different materials.

[0038] A sludge introduction slope 7 is disposed in the sludge introduction section 5. The sludge introduction slope 7 is a slope with a cross section that is approximately U-shaped, and is a member that introduces the sludge Z by pouring it into the sludge introduction section 5. The tip of the sludge introduction slope 7 is disposed approximately in the center in the radial direction of the rotor 4. A cover member 15 is provided on the lower part of the sludge introduction slope 7 near the sludge introduction section 5 of the rotor 4. The cover member 15 can prevent the introduced sludge from flowing back out of the rotor 4. The cover member 15 is fixed to the sludge introduction slope 7, but is not fixed to the rotor 4. The sludge Z is placed on the sludge introduction slope 7 by a small heavy machine, human power, or other automatic means such as a conveyor. The sludge Z is poured into the sludge introduction section 5 by the inclination of the sludge introduction slope 7. In cases where the sludge cannot be smoothly poured into the sludge inlet section 5 due to its properties (water content, viscosity, etc.), the sludge inlet slope 7 may be provided with known scraping means or vibration means.

[0039] The sludge treatment device 1 has an air supply means. Specifically, the air supply means includes a blower 12 and an air supply nozzle 13 that discharges air from the blower. The air supply nozzle 13 is disposed inside the rotor 4 on the upper side of the sludge introduction section 5, and provides an air flow from the upper side of the rotor 4 toward the lower side of the rotor 4. This air flow makes it easier to carry impurities such as grass and plastic dust that have floated to the upper surface of the sludge during treatment in the rotor 4 and guide them to the impurity discharge section 6. The blower 12 is not particularly limited, and a publicly known electric or internal combustion blower can be used. It is preferable to dispose the air supply nozzle 13 in a direction such that the generated air flow hits and flows along the sludge surface from the upper side of the rotor 4 toward the lower side of the rotor 4.

[0040] Next, an example of a mechanism for preventing clogging in the mesh portion will be described with reference to Figures 2 and 3. Figure 2 is a radial cross-sectional view showing the internal structure of the rotor, and Figure 3 is a partial axial cross-sectional view showing the internal structure of the rotor. In the example shown in FIG. 2 and FIG. 3, a chain member 16 is provided inside the rotor 4. The chain member 16 is provided on the mesh portion 3A (3B) at the inner diameter portion of the rotor 4. The chain member 16 may be provided on the mesh portion itself or on the inner diameter portion (inner diameter surface) of the rotor 4 that is not a mesh portion as the rotor 4 rotates. When the rotor 4 rotates, the chain member 4 also moves in conjunction with the rotation of the rotor 4. As a result, the chain member 16 contacts the inner diameter surface of the mesh portion 3A (3B) as if it is hitting the mesh portion 3A (3B) or sliding while dragging the mesh portion 3A (3B). As a result, the impurities caught in the mesh portion 3A (3B) can be removed. In particular, even impurities that are long and thin, such as lines, threads, or strings, such as grass, which are usually not easy to remove, can be removed.

[0041] The material of the chain member 16 may be, as with the rotor, stainless steel, metal, metal alloy, resin, etc. In addition to being corrosion resistant, it is preferable that the chain member 16 is relatively heavy in weight because it has a greater effect of removing impurities such as grass, and it is preferable to use stainless steel or an iron alloy coated with a corrosion coating.

[0042] As shown in FIG. 3, in a configuration in which the chain member 16 is provided on the mesh portion 3A (3B), it is preferable to engage the ring-shaped end 16a of the chain member 16 with a part of the lattice 3a constituting the mesh portion. The ring-shaped end 16a of the chain member 16 has a range in which it can move slightly relative to the lattice 3a of the mesh portion. If the chain member 16 is completely fixed to the mesh portion or the inner diameter portion of the rotor, impurities such as grass are likely to get caught and accumulate at the fixed portion. In contrast, by connecting the end 16a of the chain member 16 to the mesh portion 3A (3B) while leaving a movable range as described above, it is possible to prevent impurities from getting caught and accumulating at the connected portion.

[0043] The clogging prevention mechanism using the chain-like member as described above does not require any special power source, has a simple structure and is easy to install, yet is highly effective in preventing clogging of the mesh section.

[0044] Next, the partition plate inside the rotor will be described with reference to Fig. 4. Fig. 4 is a radial cross-sectional view of the inside of the rotor as viewed from the impurity discharge part side (the inclined lower side). In the example shown in Fig. 4, there is a partition plate 14 that protrudes toward the inner diameter side of the rotor 4 near the impurity discharge portion of the rotor 4 and above the impurity discharge portion. The partition plate 14 is also shown by a dotted line in Fig. 1. The partition plate 14 has an impurity passage portion 17 that is a notch portion in a part of the circumferential direction. The partition plate 14 may be made of the same material as the rotor 4. The partition plate 14 and the rotor 4 can be joined by welding or other known means.

[0045] The height of the partition plate 14 (height from the inner diameter surface of the rotor 4) may be any height that does not completely block the opening on the impurity discharge section side of the rotor 4, and taking into consideration the impurity discharge performance, may be, for example, 2 / 3 or less, 1 / 2 or less, or 1 / 3 or less of the inner diameter of the rotor 4. Furthermore, if the impurity passing section 17 has a large circumferential width, there is a risk that a non-negligible amount of sludge will be discharged. Therefore, the width (the total width if there are multiple sections) may be, for example, 1 / 3 or less, 1 / 4 or less, or 1 / 6 or less of the inner circumference of the rotor 4.

[0046] Since this sludge treatment device has a simple structure using an inclined cylindrical rotor, there is a risk that the sludge will reach the lower end of the incline and be discharged to the outside before it is completely separated. By providing the partition plate 14, such sludge can be pushed back to prevent unexpected discharge of sludge and perform separation processing again. In addition, by providing the impurity passage section 17, which is a cutout section rather than a complete partition, impurities such as grass and plastic dust that have moved along the top of the sludge can be easily guided to the impurity discharge section.

[0047] In addition, because the sludge treatment device of the present invention has a simple overall structure, its size and weight are such that the entire device can be loaded onto the bed of a 2-ton truck (Road Traffic Act). By loading the device onto a 2-ton truck, the freedom of movement is increased, and the device can be effectively used in sludge treatment businesses where impurities have previously been removed manually.

[0048] Although the sludge treatment apparatus of the present invention has been specifically explained above with reference to the drawings, the present invention is not limited to the above-mentioned configuration. [Industrial Applicability]

[0049] The sludge treatment device of the present invention has a simple structure, is not easily clogged, and can continuously separate mud from impurities such as grass, so it can be widely used as a sludge treatment device for separating mud from impurities such as grass and plastic dust contained in sludge such as wastewater sludge, industrial sludge, agricultural sludge, etc. In particular, it is suitable for impurity removal treatment in wastewater sludge on a relatively small scale by local governments. [Explanation of symbols]

[0050] 1 Sludge treatment equipment 2 Opening 3A Mesh section (upper slope) 3B Mesh section (downward slope) 3a Mesh grid 4 Rotating body 5 Sludge introduction section 6. Impurity discharge section 7 Sludge introduction slope 8 Rotation motor (rotation mechanism) 9 Support roller 10 Mud Slope 11 Impurity Slope 12 Blower (air supply means) 13 Air supply nozzle 14 Partition 15 Lid member 16 Chain member 16a End of chain member 17 Foreign Matter Passage Part X Mud Y Foreign Matter Z Sludge

Claims

1. A sludge treatment apparatus for separating and treating mud from other impurities from sludge, A cylindrical rotor having an opening on a part of its outer periphery, The rotor is disposed at an incline with respect to the horizontal, and has a sludge inlet at an end of the rotor on the upper side of the incline and a foreign matter discharge part at an end of the rotor on the lower side of the incline, the opening portion is composed of at least two mesh portions arranged along the cylindrical axial direction of the rotor, and a mesh opening of the mesh portion on the inclined upper side of the rotor is smaller than a mesh opening of the mesh portion on the inclined lower side of the rotor, A sludge treatment device characterized in that mud contained in the sludge introduced from the sludge inlet section is discharged to the outside of the rotating body through the openings in the mesh section, and impurities that are not discharged to the outside through the mesh section are discharged from the impurity discharge section.

2. 2. The sludge treatment apparatus according to claim 1, further comprising a chain member provided on an inner diameter portion of the rotor and contacting at least one of the mesh portions as the rotor rotates.

3. 3. A sludge treatment device according to claim 2, wherein the chain-shaped member is provided in at least one of the mesh portions, and a ring-shaped end of the chain-shaped member is engaged with a part of a lattice constituting the mesh portion.

4. 3. A sludge treatment device as described in claim 1 or claim 2, characterized in that the rotating body has a partition plate protruding toward the inner diameter side of the rotating body above the impurity discharge section, and the partition plate has a impurity passage section in part of the circumferential direction.

5. The sludge treatment device according to claim 1 or claim 2, characterized in that the sludge treatment device has an air supply means inside the rotor, above the sludge introduction section, for providing an air flow from the upwardly inclined side of the rotor to the downwardly inclined side of the rotor.

6. 3. A sludge treatment device as described in claim 1 or claim 2, characterized in that the rotating body does not have a central shaft member, is supported by support rollers in contact with the outer diameter portion of the rotating body, and is rotated by a rotation mechanism provided outside the rotating body.

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