Sludge treatment equipment

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] Drainage channels and sewer pipes managed by local governments are filled with wastewater from roads and buildings, from homes and businesses, and from agriculture, and as a result, mud, grass, plastic dust, and other impurities accumulate and become wastewater sludge.If left unattended, wastewater sludge will interfere with drainage, so it is regularly cleaned by local governments using manual labor and vehicles such as high-pressure cleaners and sludge vacuum trucks.

[0003] Methods for disposing of collected sludge include mixing it with solidifying materials such as cement at a recycling facility to produce a material, or composting it through processes such as drying and fermentation 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. Other methods include incineration of wastewater sludge at high temperatures at incineration facilities, burning the organic matter and significantly reducing its volume, or disposing of it in landfills on coasts or underground.

[0004] Because wastewater sludge contains impurities other than mud, if necessary, a process to remove these impurities is carried out as a preliminary step to each of the above treatments. 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, mesh, and paper. Filter separation devices such as drum filters, which use cylindrical metal mesh filters, are sometimes used to separate impurities from sludge. Sedimentation is a method of holding sludge in a container or pouring it into a settling tank and allowing it to settle for a sufficient period of time. Flotation is a method of separating solids from sludge using buoyancy. Flotation uses a special flotation device that floats solids with specific buoyancy (such as plastic and rubber). Sludge is loaded into the device, and specific solids rise to the surface using air bubbles and buoyancy, and are separated as suspended matter.

[0005] Meanwhile, in relatively small-scale wastewater sludge impurity removal processes in local governments, impurities are sometimes removed manually rather than by the continuous mechanical process described above. Manual processing takes a significant amount of time and requires high labor costs, which can lead to increased processing costs for local governments. Furthermore, from the perspective of securing workers, the manual work of removing weeds and plastic debris from sludge is both environmentally and mentally demanding, and it is not easy to secure personnel to carry out this task.

[0006] Given this background, continuous mechanical treatments such as those described above are being considered for the removal of impurities from wastewater sludge. However, while sedimentation allows for large-scale treatment in one go, it requires time and large equipment, making it impractical to introduce new treatments on this scale. Furthermore, flotation requires specialized equipment such as flotation tanks and machines, and requires experience and expertise to properly adjust parameters such as bubble generation and buoyancy control to achieve optimal separation results, making it difficult to adopt on this scale, just like sedimentation. In contrast to these methods, filtration, which uses filtration separation devices such as drum filters, is difficult to handle on a large scale, but it can be performed with small equipment, making it promising for small-scale treatment.

[0007] Patent Document 1, for example, is a known technology for separating impurities from wastewater sludge using a drum filter. In a typical drum filter, a fixed comb-like scraper engages with the drum screen, which rotates at a predetermined speed, during part of its revolution. This scraper scrapes and removes impurities that become clogged in the drum screen's meshes. In this case, the torque applied to the drum increases when removing impurities entangled in the scraper's teeth, potentially resulting in overload. In contrast, Patent Document 1 proposes a structure in which rotating scrapers, arranged to mesh with the drum screen's meshes, are driven in the same direction at a higher peripheral speed than the drum screen to continuously filter sludge. After the drum screen is shut down, the rotating scrapers are rotated in the reverse direction for a short time to remove impurities trapped between the rotating and fixed scrapers, and then stopped to remove impurities adhering to the drum screen and the rotating scrapers. This is said to reduce the amount of foreign matter getting caught and remaining in the scraper portion, prevent an increase in the rotation torque of the drum screen, and reduce the amount of 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, the installation of complex mechanisms in filtration and separation devices such as drum filters increases the cost of the device. This is particularly problematic when used for the removal of impurities from wastewater sludge in relatively small-scale municipal operations. Furthermore, if the rotation of the filtration and separation device needs to be stopped during operation to remove impurities, the efficiency of the operation may be insufficient depending on the frequency of this operation.

[0010] Furthermore, among the impurities contained in wastewater sludge, grasses (grass, trees, dead grass, dead wood, etc.) are particularly problematic. Because grasses have long, thin shapes such as lines, threads, and strings, they tend to get caught in the filter holes of the screen when using a filtration separation device with uniformly small meshes, such as a drum filter, and can easily cause clogging. Furthermore, because they become tangled in a complex manner, they are difficult to remove 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 such cases, agricultural wastewater often contains grasses, which are also contained in the wastewater sludge. Furthermore, agricultural wastewater contains pesticides, fertilizers, and agricultural product residues, which can lead to new grasses growing in the sediments of drainage ditches and catch basins. Therefore, when treating wastewater sludge containing such agricultural wastewater, clogging is likely to occur, making cleaning and removal difficult even when the system is shut down.

[0012] The present invention has been made in consideration of the above background, and aims to provide a sludge treatment device that has a simple structure, is less likely to clog, and can continuously separate the mud contained in the sludge 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 is characterized in that it has a cylindrical rotating body with an opening on part of its outer circumference, the rotating body being arranged at an angle to the horizontal, with a sludge inlet at the end of the rotating body on the upper side of the angle and an impurity discharge section at the end of the rotating body on the lower side of the angle, the opening consisting of at least two mesh sections arranged along the cylindrical axial direction of the rotating body, the mesh openings on the upper side of the angle of the rotating body being smaller than the mesh openings on the lower side of the angle of the rotating body, and the mud contained in the sludge introduced from the sludge inlet section being discharged to the outside of the rotating body through the openings of the mesh sections, and the impurities not discharged to the outside by the mesh sections being 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, and 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 that constitutes 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 in a part of its circumferential direction.

[0016] The sludge treatment device is characterized by having an air supply means for providing an air current from the upper side of the sludge introduction section to the lower side of the sludge introduction section inside the rotator.

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

[0018] The sludge treatment device of the present invention has a cylindrical rotor with an opening on a portion of its outer periphery. The rotor is tilted relative to the horizontal, with a sludge inlet at the upper end of the rotor and a contaminant discharge port at the lower end. The openings are composed of at least two mesh sections arranged along the axial direction of the rotor. The mesh openings on the upper end of the rotor are smaller than those on the lower end of the rotor. This means that sludge continuously introduced into the cylinder is less likely to be discharged through the mesh sections on the upper end than through the mesh sections on the lower end. The sludge is sufficiently retained on the upper side, allowing contaminants such as grass and plastic waste to float to the upper surface of the sludge, which then easily passes to the contaminant discharge port on the lower side. Furthermore, the mesh sections on the lower end of the rotor allow sludge to be discharged more quickly than those on the upper side, and are less likely to clog due to their larger mesh openings and fewer contaminants. As a result, despite the overall simple structure, clogging is unlikely to occur, the frequency of maintenance work due to interruptions is reduced, sorting processing can be carried out continuously, and work efficiency is excellent.

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

[0020] Furthermore, by providing a chain-like member on at least one of the mesh sections and engaging the ring-shaped end of the chain-like 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-like member and the mesh section, and as a result, prevents clogging in the mesh section.

[0021] The rotor has a partition plate that protrudes toward the inner diameter of the rotor above the impurity discharge section, and the partition plate has an impurity passage section in part of the circumferential direction, which prevents sludge from being discharged from the end of the rotor on the inclined lower side of the rotor, and makes 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 inclined side of the rotor to the lower inclined side.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 sludge treatment, and impurities such as grass and plastic dust do not get caught on the central shaft member. [Brief explanation of the drawings]

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

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

[0026] Mud is composed of mud, earth, and sand that adheres to the ground or soil surface. Mud is generated when the 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 water flowing from the ground or roads, contamination of the ground surface, wastewater from homes and businesses, and rainwater.

[0027] Furthermore, impurities contained in wastewater sludge other than mud may include, for example, grasses, plastic dust (plastic waste and parts of household goods, etc.), stones (stones and sand from construction and road construction, etc.), paper waste (paper product waste and parts of household goods, etc.), and others (scrap metal, glass scraps, furniture fragments, etc.). Here, grasses, as mentioned above, include grass, trees, dead grass, dead trees, etc., and also include plant debris such as weeds, tree parts such as wood chips and branches, and dead plant debris.

[0028] The sludge treatment device of the present invention can be applied to any of the above sludges. Furthermore, because of its simple structure and low cost, it is effective as an alternative to the conventional manual removal of impurities from wastewater sludge in relatively small-scale municipal facilities. In particular, because it is less susceptible to clogging, it can be effectively used for 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, with a portion of the mud slope and impurity slope around the rotor removed for the purpose of explanation. The sludge treatment device 1 has a cylindrical rotor 4 with an opening 2 on a portion of its outer periphery. The rotor 4 is tilted relative to the horizontal, with a sludge inlet 5 at the upper end of the rotor and a contaminant discharger 6 at the lower end. The contaminant discharger 6 is a circular opening at the lower end of the rotor. The opening 2 is made up of multiple mesh sections 3A, 3A, 3B, and 3B arranged along the cylindrical axial direction of the rotor 4. Mud X contained in sludge Z introduced through the sludge inlet 5 is discharged to the outside of the rotor 4 through the openings of each mesh section. The mud X is collected outside the device via a mud slope 10 arranged on the outer periphery of the rotor 4. Furthermore, contaminants Y contained in sludge Z introduced through the sludge inlet 5 are not discharged to the outside through each mesh section but are discharged from the contaminant discharger 6. The impurities Y are collected outside the device via an impurity slope 11 arranged on the outer periphery of the end of the rotor 4.

[0030] The inclination angle of the rotor 4 is set to, for example, 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 that contact its outer diameter, 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, in the axial direction of the cylinder. Each axial location of the cylinder is supported by two support rollers 9 (see Figure 2).

[0032] The rotation speed of the rotor 4 does not need to be high because the sludge is retained inside the rotor for a certain period of time before separation, and may be, for example, 10 to 80 rpm, 10 to 60 rpm, 15 to 40 rpm, or 20 to 40 rpm. Furthermore, 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 now 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, "mesh opening" refers to the size of the opening portion of the mesh portion (the area of an opening per opening). As viewed in the axial direction of the cylinder, it is sufficient that the mesh opening on the upper side of the inclination is smaller in at least two regions, one region on the inclined upper side and one region on the inclined lower side. In the embodiment of FIG. 1, as viewed in the axial direction of the cylinder, mesh portions 3A are provided in two regions and mesh portions 3B are provided in two regions, and the mesh portions 3A have the same mesh opening, and the mesh portions 3B have the same mesh opening. Furthermore, in the embodiment of FIG. 1, the mesh portion is divided into multiple portions at the same region as viewed in the axial direction of the cylinder, but the entire periphery of that region may be a continuous mesh portion.

[0034] The mesh portion has a plurality of openings. The opening shape is not particularly limited, and may be a lattice-like opening like that of a mesh member shown in FIG. 1 or a circular opening like that of a punched metal. As described above, the opening size is sufficient as long as the opening size on the upper side is smaller in at least two areas, one on the upper side and one on the lower side, as viewed in the axial direction of the cylinder. 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 lattice-like openings, each 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 circular openings, the diameter is 1 cm to 8 cm, 2 cm to 6 cm, or 3 cm to 5 cm. The difference (ratio) in the opening size between the upper side and the lower side is not particularly limited, but for example, the ratio of the opening size on the upper side to the opening size on the lower side is approximately 1:4 to 3:4.

[0035] To achieve a difference in mesh size between the upper and lower sides of the slope, for example, mesh sections with different mesh sizes can be simply prepared, or mesh members with the same mesh size as the mesh members used on the lower side of the slope, with the mesh sizes being smaller, can be placed on top of each other with the grids offset. By using mesh sections with such overlapping grids, three-dimensional irregularities are formed on the inner diameter surface of the mesh section when sludge accumulates on the upper side of the slope, which makes it easier to stir the sludge.

[0036] As described above, the sludge treatment device of the present invention has a difference in mesh size between the upper and lower sides of the inclined sludge, with the mesh size on the upper side of the rotor being smaller than that on the lower side of the rotor. This structure ensures that sludge continuously introduced into the rotor is less likely to be discharged from the mesh section on the upper side of the inclined sludge, and instead remains within the rotor for a sufficient period of time. During this retention period, the small mesh size allows only fine mud to be discharged, while grass, wood, and plastic debris are difficult to discharge. During retention, impurities such as grass and plastic debris tend to float to the upper surface of the sludge. Once impurities have risen to the upper surface of the sludge, they are more likely to be sent to the impurity discharge section below. This is even more pronounced when forced air is supplied by a blower or other device, as described below. The sludge is then sent to the mesh section on the lower side of the inclined sludge. At this point, the impurities are reduced as described above, and the mesh size is large, reducing the 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 for continuous sludge separation and processing, resulting in excellent work efficiency.

[0037] Examples of materials for the rotor and mesh section include stainless steel, aluminum, iron, or metal alloys, polyolefin resins such as polypropylene and polyethylene, polyester resins such as polyethylene terephthalate, polycarbonate resins, and polyamide resins. Because sludge contains a large amount of hard sand, water, and chemical components, it is preferable to use stainless steel or iron alloys with corrosion coating, which have excellent mechanical strength and corrosion resistance. The rotor and mesh section 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 roughly U-shaped cross section, and is a member that introduces 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 at the bottom of the sludge introduction slope 7, near the sludge introduction section 5 of the rotor 4. The cover member 15 prevents the introduced sludge from flowing back out of the rotor 4. The cover member 15 is fixed to the sludge introduction slope 7, but not to the rotor 4. The sludge Z is placed on the sludge introduction slope 7 by small heavy machinery, human power, or other automatic means such as a conveyor. The sludge Z is poured into the sludge introduction section 5 due to the inclination of the sludge introduction slope 7. If the sludge cannot be smoothly poured into the sludge introduction section 5 due to its properties (water content, viscosity, etc.), the sludge introduction slope 7 may be provided with known scraping means or vibration means.

[0039] The sludge treatment apparatus 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 located inside the rotor 4 above the sludge introduction section 5 and provides an airflow from the upper side of the rotor 4 toward the lower side of the inclination. This airflow facilitates the removal of impurities such as grass and plastic waste that have risen to the upper surface of the sludge during treatment in the rotor 4, along with the airflow, and the removal of the impurities from the impurity discharge section 6. The blower 12 is not particularly limited, and a known electric or internal combustion engine blower can be used. The air supply nozzle 13 is preferably positioned so that the generated airflow flows from the upper side of the rotor 4 toward the lower side of the inclination while hitting and following the sludge surface.

[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 Figures 2 and 3, a chain-like member 16 is provided inside the rotor 4. The chain-like member 16 is attached to the mesh portion 3A (3B) at the inner diameter of the rotor 4. The chain-like member 16 may be disposed so as to come into contact with at least one of the mesh portions 3A (3B) as the rotor 4 rotates. The chain-like member 16 may be provided on the mesh portion itself, or on an inner diameter portion (inner diameter surface) of the rotor 4 that is not a mesh portion. When the rotor 4 rotates, the chain-like member 4 also moves in conjunction with the rotation of the rotor 4. This causes the chain-like member 16 to contact the inner diameter surface of the mesh portion 3A (3B) in a clanging or sliding manner. As a result, impurities caught in the mesh openings of the mesh portion 3A (3B) can be removed. This is particularly effective for removing impurities that are long and thin, such as grass, threads, or strings, which are usually difficult to remove.

[0041] Like the rotor, the material of the chain member 16 can be stainless steel, metal, metal alloy, resin, etc. In addition to being corrosion resistant, it is also effective in removing impurities such as grass, so it is preferable that the chain member 16 is heavy to a certain extent, and it is therefore preferable to use stainless steel or an iron alloy with a corrosion coating.

[0042] Furthermore, as shown in FIG. 3, in a configuration in which the chain-like member 16 is provided on the mesh portion 3A (3B), it is preferable to engage the ring-shaped end 16a of the chain-like member 16 with a portion of the lattice 3a that constitutes the mesh portion. The ring-shaped end 16a of the chain-like member 16 has a slight range of movement relative to the lattice 3a of the mesh portion. If the chain-like member 16 is completely fixed to the mesh portion or the inner diameter portion of the rotor, impurities such as grasses tend to get caught and accumulate at the fixed portion. In contrast, by connecting the end 16a of the chain-like member 16 to the mesh portion 3A (3B) while leaving a range of movement 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 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 seen from the impurity discharge part side (the inclined lower side). In the example shown in Figure 4, a partition plate 14 is provided that protrudes toward the inner diameter side of the rotor 4, near the impurity discharge section of the rotor 4 and above the impurity discharge section. The partition plate 14 is also shown by a dotted line in Figure 1. The partition plate 14 has an impurity passage section 17 that is a notch in a part of the circumferential direction. The material of the partition plate 14 can be the same as that of 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 considering the impurity discharge performance, it is set to, 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 circumferential width of the impurity passing section 17 is large, 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) is set to, for example, 1 / 3 or less, 1 / 4 or less, or 1 / 6 or less of the inner circumference of the rotor 4.

[0046] Because 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 slope and be discharged outside before it is completely separated. By providing a partition plate 14, this sludge can be pushed back, preventing unexpected sludge discharge and allowing the sludge to be separated again. Furthermore, by providing a notched impurity passage 17 rather than a complete partition, impurities such as grass and plastic dust that have moved along the top of the sludge can be more easily guided to the impurity discharge section.

[0047] Furthermore, 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 it onto a 2-ton truck, the degree of freedom in movement is increased, and it 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 described 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 less likely to clog, and can continuously separate the mud from impurities such as grass, etc., and can therefore be widely used as a sludge treatment device for separating the mud from impurities such as grass, plastic dust, etc. contained in sludge such as wastewater sludge, industrial sludge, agricultural sludge, etc. It is particularly suitable for impurity removal treatment of 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 bodies 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 Divider 15 Lid member 16 Chain member 16a End of chain member 17. Parts passing through the section X Dirt Y clip Z Sludge

Claims

1. A sludge treatment apparatus for separating and treating mud and other impurities, including grasses, from wastewater sludge, including agricultural wastewater, comprising: a cylindrical rotor having an opening in a part of its outer periphery; The rotor is disposed at an incline with respect to the horizontal, and has a sludge introduction section at an end of the rotor on the upper side of the incline and a foreign matter discharge section 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 the mesh opening of the mesh portion on the inclined upper side of the rotor is smaller than the mesh opening of the mesh portion on the inclined lower side of the rotor, The mud contained in the sludge introduced from the sludge inlet portion is discharged to the outside of the rotor through the openings of the mesh portion, and the impurities that are not discharged to the outside through the mesh portion are discharged from the impurity discharge portion. a chain-like member provided on an inner diameter portion of the rotating body and contacting at least one of the mesh portions as the rotating body rotates; the chain-like member is provided on at least one of the mesh portions, and only one of both end portions of the chain-like member, that is, a ring-shaped end portion, is engaged with a part of a lattice constituting the mesh portion, leaving a movable range; A sludge treatment device characterized in that the rotating body does not have a central shaft member, is supported by support rollers that contact the outer diameter portion of the rotating body, and is rotated by a rotation mechanism provided outside the rotating body.

2. 2. The sludge treatment device according to claim 1, wherein 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 an impurity passage section in part of its circumferential direction.

3. The sludge treatment device according to claim 1 or 2, characterized in that the sludge treatment device has an air supply means inside the rotor, above the sludge introduction section, which provides an air flow from the upper side of the rotor to the lower side of the rotor.

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