JPH06409A - Wastewater treatment apparatus - Google Patents

Abstract

PURPOSE:To provide a wastewater treatment apparatus which has high treating function of magnetic particles contained in wastewater and surely discharge the magnetic particles attracted to a permanent magnet. CONSTITUTION:A wastewater treatment apparatus is provided with a wastewater treatment tank 22, in which a wastewater transporting pipe 28 and a trough 36 for discharging treated water are installed respectively in the lower part and in the upper part and wastewater flows upward, and a plurality of magnetic disks which are immersed in the wastewater in the wastewater treatment tank 22 and arranged in line in a rotary axis while keeping a prescribed distance between each other. The apparatus is composed of a plurality of permanent magnet pieces arranged concentrically on the surface of the magnetic disks 24, a scratching apparatus 48 which circulates up and down directions while abutting on the permanent magnet pieces, a sludge discharging route 66 which is so formed as to surround the scratching apparatus 48 and guides sludge to a sludge discharging outlet 64, and an overflowing outlet 70 from which treated water in the sludge discharging route 66 overflows.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sewage treatment apparatus, and more particularly to a sewage treatment apparatus for separating and collecting sludge such as magnetic particles contained in sewage in a sewage treatment facility with a magnetic separator.

[0002]

2. Description of the Related Art Conventionally, in this type of wastewater treatment apparatus, as shown in FIG. 6, about half of the magnetic disk 3 is submerged in the wastewater 2 filled in the treated water tank 1. As shown in FIG. 7, the magnetic disk 3 is fixed to the rotating shaft 4 at equal intervals, and the rotating force of the motor 5 is transmitted to the rotating shaft 4 via the speed reducer 6 to rotate. Further, the magnetic disk 3 has a plurality of permanent magnet pieces 7, 7 shown in FIG. (Shown in 7), a magnetic field of opposite polarity is generated.

Therefore, the magnetic particles contained in the waste water 2 are adsorbed to the permanent magnet pieces 7, 7 ... And separated by the magnetic field. Further, the sewage from which the magnetic particles have been separated, that is, the treated water is pushed by the sewage ejected from the sewage inlet 9 of the treated water tank 1 and flows upward in the treated water tank 1 to the trough 10 from the upper surface of the treated water tank 1. It flows down and is discharged. by the way,
The magnetic particles adsorbed on the permanent magnet pieces 7, 7 ...
Is rotated and scraped off by the scraper device 11 shown in FIG. 6, and then discharged by the screw conveyor 12.

The scraper device 11 scrapes off the magnetic particles adsorbed on the permanent magnet pieces 7, 7 ... At the edge portion of the belt 15 stretched by the pair of pulleys 13 and 14, and a mass of the scraped magnetic particles. 16 is conveyed to the screw conveyor 12 by the operation of the belt 15. In addition, Japanese Examined Sho 59-
In Japanese Patent No. 26346, in order to facilitate the scraping of the magnetic particles 16 by the scraper device 11, as shown in FIG. 9, the fan-shaped areas 17, 17 not provided with the magnetic disk 3 permanent magnet pieces 7, 7 ... Is provided.

[0005]

However, the conventional sewage treatment apparatus has the following drawbacks. (1) The amount of magnetic particles adsorbed is proportional to the total surface area of the permanent magnet pieces 7, 7 ... Of the permanent magnet pieces 7, 7 ... In order to adsorb a large amount of magnetic particles in the magnetic separator, the number of magnetic discs 3 must be increased, and the magnetic separator becomes large. (2) When the magnetic particles adsorbed on the permanent magnet pieces 7, 7 move from the water to the atmosphere by the rotation of the magnetic disk 3, the surface tension of the water, the flowing speed in the gap 8, the rotating speed of the magnetic disk 3, etc. The magnetic particles tend to be peeled off from the permanent magnet piece 7 before reaching the scraper device 11 and mixed into the waste water again, which makes it difficult to reliably discharge the magnetic particles out of the tank.

The present invention has been made in view of the above circumstances, and has a large treatment capacity for magnetic particles, and a wastewater treatment using a magnetic separator capable of reliably discharging the magnetic particles adsorbed on the permanent magnet pieces. The purpose is to provide a device.

[0007]

In order to achieve the above-mentioned object, the present invention adsorbs and separates magnetic particles in wastewater flowing into a wastewater treatment tank from the wastewater by a magnetic plate arranged in the wastewater treatment tank. In the sewage treatment apparatus for discharging the sewage treatment tank to the outside, a sewage treatment tank having a sewage inlet at the bottom and a treatment water outlet at the top, and sewage of the sewage treatment tank A plurality of disc-shaped magnetic bodies that are submerged inside and are mounted in parallel on the rotating shaft at a predetermined interval, and a plurality of disc-shaped magnetic bodies disposed on the surface of the disc-shaped magnetic bodies. It consists of a plurality of permanent magnet pieces that generate magnetic fields of different polarities in the air gap, and an endless belt with a scraper, and scrapes the sludge that is circulated and adsorbed on the surface of the permanent magnet piece, and scrapes the scraped sludge into the circle. A scraping device for moving above the plate-shaped magnetic body, and the sewage treatment tank A sludge discharge passage that is provided in the waste water and that surrounds the scraping device and guides the sludge scraped by the scraper to a sludge discharge port, and the sludge discharge passage that is formed in communication with the sludge discharge passage It is characterized by comprising an overflow port through which the treated water inside overflows.

[0008]

According to the present invention, the plurality of disc-shaped magnetic bodies are submerged in the wastewater of the wastewater treatment tank and are mounted in parallel on the rotating shaft at a predetermined interval, and the disc-shaped magnetic bodies are arranged. All permanent magnet pieces were made to adsorb sludge such as magnetic particles in wastewater. As a result, the treatment capacity of magnetic particles can be improved as compared with the conventional sewage treatment apparatus in which the lower half of the same number of disk magnetic bodies is submerged in sewage.

Further, the magnetic particles adsorbed on the permanent magnet pieces of the disk magnetic body are scraped off from the permanent magnet pieces by the rotation of a scraping device composed of an endless belt with a scraper, and are forcibly moved upward. It is made to be taken into the passage for sludge discharge. Then, the sludge taken into the sludge discharge passage is guided to the sludge discharge passage and discharged from the sludge discharge port. At this time, since the treated water in the sludge discharge passage overflows from the overflow port, an upward flow in the same direction as the sludge moving direction is generated in the sludge discharge passage. Thereby, even if the sludge is forcibly moved upward and taken into the sludge discharge passage, no backflow occurs in the sludge discharge passage. Therefore, the sludge taken into the sludge discharge passage moves through the sludge discharge passage without returning to the disk-shaped magnetic body side, and is surely discharged from the sludge discharge port.

On the other hand, the sewage having the magnetic particles separated from the inflow port provided in the lower part of the sewage treatment tank, that is, the treated water, rises due to the upward flow to the drain port formed in the upper part of the sewage treatment tank. The treated water flows in and is discharged, and a part of the treated water is discharged from the overflow port of the sludge discharge passage. In addition, if a discharge valve is provided at the sludge discharge port and the discharge valve is opened every predetermined time, or the opening degree of the discharge valve is adjusted,
Sludge is concentrated compared to natural discharge, and sludge with a low water content can be discharged. Furthermore, a detection sensor for detecting the sludge concentration in the sludge discharge passage is provided, or a detection sensor for detecting the amount of the overflow water is provided, and the discharge valve is controlled based on the detection result of this detection sensor. Then, the discharge valve can be automatically controlled according to the fluctuation of the pollution load of the raw water flowing into the wastewater treatment tank. Further, when the sludge discharge port is arranged at a position lower than the water surface of the wastewater treatment tank, magnetic particles can be discharged by utilizing the head difference from the wastewater treatment tank, and a water suction pump is installed at the sludge discharge port. The magnetic particles can be forcibly discharged by connecting and operating this water absorption pump. Further, by disposing a discharge device at a lower portion of the wastewater treatment tank, the magnetic particles separated and dropped from the disc magnetic body and settled can be discharged to the outside of the tank.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of a wastewater treatment apparatus according to the present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 shows an embodiment of a sewage treatment apparatus 20 according to the present invention. A plurality of magnetic discs 24, 24, which will be described later, are mounted on a rotary shaft 26 in a sewage treatment tank 22 of the sewage treatment apparatus 20. ing. Further, a sewage transport pipe 28 is disposed below the sewage treatment tank 22 so as to penetrate a side surface of the sewage treatment tub 22.
The sewage spout 30 opened at the end of 8 is the magnetic disc 2
It is formed toward the central part of 4, 24 ... Further, a diffusion plate 32 is provided above the sewage spout 30, and the sewage spouted from the sewage spout 30 by this diffusion plate 32 is supplied to the entire sewage treatment tank 22 as shown by the arrow in the figure. . The sewage discharged from the sewage spout 30 rises in the sewage treatment tank 22 as an upward flow, and is guided by the guide block 34 disposed on the inner peripheral surface of the sewage treatment tank 22 to the magnetic disc 2
It is guided toward the center of 4.

The sewage guided in the direction of the center of the magnetic disc 24 passes through the magnetic disc 24, and then flows down into a trough 36 installed on the inner peripheral surface of the upper portion of the sewage treatment tank 22 and is discharged. As shown in FIG. 3, the magnetic disks 24 are arranged at equal intervals by a cylindrical collar 38 and a core 40 which are inserted into the rotary shaft 26. Further, in the magnetic disc 24, a plurality of permanent magnet pieces 44, 44 ... Are attached to the surface of a disc-shaped magnetic plate 42 by magnetic force, and a synthetic resin cover is provided on the surface of the permanent magnet pieces 44, 44. 46 are dressed. The permanent magnet pieces 44, 44 ... Are attached concentrically to the magnetic plate 42 and face each other by the adjacent permanent magnet pieces 44, 44 ... And the magnetic plates 42, 42. The permanent magnet pieces 44, 44 ... Are combined so as to have polarities different from each other. As a result, magnetic fields of different polarities are generated in the voids 47, 47 ... Of the magnetic disk 24.

As shown in FIGS. 1 and 2, the scraping device 48 is provided in the gaps 47, 47 ... (See FIG. 3) of the magnetic disk 24.
Is provided, and the scraping device 48 is configured as follows. That is, the endless belt 52 with the scraper 50 is provided in contact with the surface of the magnetic disk 24, and is provided over the pulley 54 fitted to the rotary shaft 26 and the pulley 56 provided above the water surface. A drive device (not shown) makes an orbit in the vertical direction in the direction of arrow 58 in the figure.

Further, a passage forming plate 62 is provided so as to surround the scraping device 48, and a hook-shaped sludge discharging passage 60 is formed. The sludge discharge passage 60 is provided for removing sludge moving upward by the scraping device 48.
The sludge discharge passage 60 from the mud collecting port 60 taken into 0
A passage is formed that connects to the sludge confluent flow path 72 that joins the sludge taken in by. A sludge discharge port 64 for discharging the sludge merged with the sludge confluent passage 72 to the outside of the wastewater treatment tank 22 is formed to penetrate the side surface of the wastewater treatment tank 22. The upper portion of the sludge discharge passage 66 is opened to the atmosphere above the water surface 68, and the sludge discharge passage 66 is discharged from the overflow port 70 formed in the partition portion of the trough 36 on the upper side surface of the sludge discharge passage 66. The treated water therein overflows into the trough 36. Further, a portion from the bent portion in the obliquely downward direction to the sludge collecting portion 72 serves as a sludge settling shelf. As shown in FIG. 3, the sludge discharge passages 66 formed as described above are arranged directly above the respective voids 47, 47 ... (See FIG. 3) of the magnetic disk 24. Further, the sludge discharge port 64 is formed at a position lower than the water surface 68 of the wastewater treatment tank 22, and a discharge valve 74 is provided at the tip thereof.

Next, the sewage treatment apparatus 2 constructed as described above
The operation of 0 will be described. First, the sewage spouted from the sewage spout 30 of the sewage transport pipe 28 becomes an upward flow and is supplied to the entire sewage treatment tank 22 by the diffusion plate 32.
Then, it is guided toward the center of the magnetic discs 24 by the guide block 34 and passes through the gap between the magnetic discs 24. At this time, the magnetic particles contained in the dirty water are attracted to the permanent magnet pieces 44, 44, ... Due to the magnetic field generated by the permanent magnet pieces 44, 44 ,. Adheres to all surfaces.

Therefore, the sewage is separated from the magnetic particles by passing through the voids, and the sewage from which the magnetic particles are separated, that is, the treated water overflows from the water surface of the sewage treatment tank 22 and flows down to the trough 36 to be discharged. . Further, a part of the treated water rises in the sludge discharge passage 66 together with the lumps 76 of magnetic particles, and overflows from the overflow port 70 to the trough 36 to be discharged.

On the other hand, the magnetic particles adhered to the cover 46 of the magnetic disk 24 are rotated in the vertical direction while coming into contact with the magnetic disk 24 when the magnetic disk 24 rotates.
Scraped by the endless belt 5 of the scraping device 48
It is forcibly moved upward by the pushing-up force of the scraper 50 attached to No. 2 and taken into the sludge discharge passage 66 from the sludge collection port 60. The lumps 76 taken into the sludge discharge passage 66 move further upward in the sludge discharge passage 66 and settle on the sedimentation shelf, and then gather at the sludge discharge port 64 through the sludge joint flow passage 72. The water is discharged from the outlet 64 to the outside of the sewage treatment tank 22. At this time, the treated water in the sludge discharge passage 66 flows into the trough 36 from the overflow port 70 of the sludge discharge passage 66.
Upflow of treated water occurs in No. 6. As a result, even if the lump 76 of magnetic particles is forcibly taken into the sludge discharge passage 66, no backflow occurs in the sludge discharge passage 66, so that a part of the lump 76 is magnetically circulated from the mud collecting port 60. The sludge discharge passage 66 can be reliably moved without returning to the plate 24 side. Further, since the sludge discharge port 64 is installed at a position lower than the water surface of the sewage treatment tank 22 by H (m), the magnetism settled on the sedimentation shelf due to the difference in the head pressure from the water surface of the sewage treatment tank 22. The lump 76 of particles can be smoothly discharged from the sludge discharge port 64 to the outside of the wastewater treatment tank 22.

Thus, the sewage treatment apparatus 20 of the present invention
Is a magnetic disk 24 submerged in the sewage of the sewage treatment tank 22, all the permanent magnet pieces 44 arranged on the magnetic disk 24,
It was made to adsorb the magnetic particles in the wastewater with 44 .... As a result, the treatment capacity of magnetic particles can be improved as compared with the conventional sewage treatment apparatus in which the lower half of the same number of disk magnetic bodies is submerged in sewage.

A scraper 50 of the scraping device 48 is also provided.
Of the magnetic particles 24 scraped from the magnetic disk 24 by the pushing force of the above and the upward flow of the treated water in the sludge discharge passage 66.
6 was smoothly moved through the sludge discharge passage 66, collected in the settling shelf, and discharged using the difference in head pressure. Thereby, the mass 76 of magnetic particles adsorbed on the magnetic disk 24 can be reliably discharged out of the tank.

Further, if a discharge valve 74 is provided at the sludge discharge port 64 and the discharge valve 74 is opened every predetermined time or the opening degree of the discharge valve 74 is adjusted, compared to the case of natural discharge. Sludge is concentrated and sludge with low water content can be discharged. Further, when the sludge load amount of the source water flowing into the sewage treatment tank 22 fluctuates, the control timing of the discharge valve 74 is difficult. Therefore, as shown in FIG. 4, the treated water in the sludge discharge passage 66 is treated. An overflow port 70 for overflowing is formed on the side of the sludge confluent channel 72, and a sludge densitometer 78 is provided in the overflow portion 73. Then, the opening / closing or the opening degree of the discharge valve 74 is controlled based on the signal from the sludge concentration meter 78. That is, the change of the pollution load of the raw water is grasped by detecting the amount of sludge accumulated in the overflow portion 73, and the discharge valve 74 is controlled.

As another control method of the discharge valve 74, as shown in FIG. 5, the trough 36 is partitioned to form a water passage 80 in which the treated water in the sludge discharge passage 66 overflows. A flow meter 82 for measuring the amount of treated water overflowing into the water channel 80 is provided. Then, the opening / closing or the opening degree of the discharge valve 74 may be controlled based on the signal from the flow meter 82. That is, the fact that the amount of sludge separated by the magnetic disk 24 and the amount of treated water overflowing from the overflow port 70 of the sludge discharge water channel 66 are in a proportional relationship is utilized.

Further, when a conveyor 84 (shown in FIG. 1) arranged from the inside of the sewage treatment tank 22 to the outside of the sewage treatment tank 22 is installed at the bottom of the sewage treatment tank 22, a mass 76 of precipitated magnetic particles is removed from the tank. Can be discharged to. In the present embodiment, the mass of magnetic particles is discharged by the difference in the head pressure, but the present invention is not limited to this, and a water suction pump is connected to the sludge discharge port to operate the water suction pump and forcibly discharge it. You may do it. Further, in the present embodiment, one pulley of the endless belt of the scraping device is fitted to the rotary shaft of the magnetic disk and driven by the rotational force of the rotary shaft, but the present invention is not limited to this. It may be driven by a driving device.

[0023]

As described above, according to the sewage treatment apparatus of the present invention, a plurality of disk magnetic bodies having a plurality of permanent magnet pieces disposed in the sewage treatment tank are submerged. Then
Sludge such as magnetic particles in wastewater was adsorbed by all the permanent magnet pieces arranged on the disc magnetic body. As a result, the treatment capacity of magnetic particles can be improved as compared with the conventional sewage treatment apparatus provided with the same number of disk magnetic bodies.

Further, a scraping device composed of an endless belt with a scraper is circulated, and a sludge discharging passage is formed so as to surround the scraping device. As a result, the sludge of magnetic particles adsorbed on the permanent magnet pieces is scraped by the scraping device and moves upward and is forcibly taken into the sludge discharge passage, and moves in the sludge discharge passage to move sludge. It is discharged from the discharge port. Therefore, the magnetic particles adsorbed on the permanent magnet pieces can be reliably discharged.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a sewage treatment apparatus according to the present invention.

FIG. 2 is a top view showing an embodiment of the sewage treatment apparatus according to the present invention.

FIG. 3 is a cross-sectional view showing an embodiment of a magnetic disc of a wastewater treatment device according to the present invention.

FIG. 4 is a sectional view illustrating a method for controlling a discharge valve of a wastewater treatment device according to the present invention.

FIG. 5 is a cross-sectional view illustrating another method for controlling the discharge valve of the wastewater treatment device according to the present invention.

FIG. 6 is a sectional view showing an embodiment of a conventional wastewater treatment device.

FIG. 7 is a side view showing an embodiment of a conventional sewage treatment apparatus.

FIG. 8 is an enlarged view of a main part showing an example of a magnetic disk of a conventional wastewater treatment device.

FIG. 9 is an explanatory view showing another embodiment of the magnetic disk of the conventional sewage treatment apparatus.

[Explanation of symbols]

 20 ... Sewage treatment device 22 ... Sewage treatment tank 24 ... Magnetic disc 28 ... Sewage transportation pipe 36 ... Trough 44 ... Permanent magnet piece 48 ... Scraping device 64 ... Sludge discharge port 66 ... Sludge discharge passage 70 ... Overflow port 74 ... Discharge valve 78 ... Pollution concentration meter 82 ... Flow meter

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Koji Ogata 2-8-1, Nishi-Shinjuku, Shinjuku-ku, Tokyo Inside Tokyo Metropolitan Sewer Bureau (72) Inventor Kiyoshi Miyajima 2--8, Nishishinjuku, Shinjuku-ku, Tokyo No. 1 Tokyo Metropolitan Sewer Bureau (72) Inventor Masayuki Kojima 1-1-14 Uchikanda Uchikanda, Chiyoda-ku, Tokyo Inside Hirit Plant Construction Co., Ltd. (72) Inventor Hitoshi Kawajiri 1-chome Uchikanda, Chiyoda-ku 1-14 No. 14 in Hiritsub.

Claims (7)

[Claims] 1. A sewage treatment apparatus for adsorbing and separating magnetic particles in sewage flowing into a sewage treatment tank from the sewage water by a magnetic plate disposed in the sewage treatment tank and discharging the sewage water to the outside of the sewage treatment tank. A sewage treatment tank having a sewage inlet at the bottom and a treatment water outlet at the top, and a submersible arrangement in the sewage of the sewage treatment tank, which is arranged in parallel with the rotary shaft at a predetermined interval. A plurality of mounted disc-shaped magnetic bodies, and a plurality of permanent magnet pieces arranged on the surface of the disc-shaped magnetic bodies to generate magnetic fields of different polarities in the respective gaps between the disc-shaped magnetic bodies. A scraping device that is composed of an endless belt with a scraper and that scrapes the sludge that is wound around and adsorbed on the surface of the permanent magnet piece, and that moves the scraped sludge above the disk-shaped magnetic body; It is installed in the wastewater of the treatment tank and surrounds the scraping device. In the sludge discharge passage for guiding the sludge scraped by the scraper to the sludge discharge port, an overflow port through which the treated water in the sludge discharge passage overflows formed in communication with the sludge discharge passage, A sewage treatment device comprising: 2. The sewage treatment apparatus according to claim 1, wherein a discharge valve is provided at the sludge discharge port. 3. A discharge valve is provided at the sludge discharge port,
The sewage treatment apparatus according to claim 1, wherein a detection sensor for detecting the sludge concentration in the sludge discharge passage is provided, and the discharge valve is controlled based on a detection result of the detection sensor. 4. A discharge valve is provided at the sludge discharge port,
The wastewater treatment system according to claim 1, further comprising a detection sensor for detecting an overflow flow rate from an overflow port formed in the sludge discharge passage, and controlling the discharge valve based on a detection result of the detection sensor. apparatus. 5. The sludge discharge port is arranged at a position lower than the water surface of the sewage treatment tank, and the sewage containing sludge flowing in from the mud collection port has a head pressure difference from the water surface of the sewage treatment tank. The sewage treatment apparatus according to claim 1, wherein the sewage treatment apparatus is used and discharged. 6. The sewage treatment apparatus according to claim 1, wherein a water suction pump is connected to the sludge discharge port. 7. The sewage treatment apparatus according to claim 1, wherein a discharge device for discharging the settled sludge to the outside of the sewage treatment tank is provided at the bottom of the sewage treatment tank.