JP2005028295A - Powder activated carbon feeder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a powder activated carbon feeder capable of smoothly feeding water-adding powder activated carbon from feeding rotors and, further, enhancing fluidity of the water-adding powder activated carbon without making the rotation of a pair of the feeding rotors impossible. <P>SOLUTION: The feeder is provided with a hopper 1 to which the water-adding powder activated carbon is stored, a rake 2 which is arranged in the hopper 1 and prevents the caking of the powder activated carbon, a casing 8 disposed under the hopper 1 and a pair of the feeding rotors 6 which are arranged freely rotatably in the casing 8 and have roughened surfaces. Further, an upper scraper and a lower scraper which come into contact with the surfaces of a pair of the feeding rotors 6 are arranged in the casing 8. In order to enhance the fluidity of the powder activated carbon, it is preferable that an air injection part for blowing compressed air into a powder activated carbon layer is disposed on a throttle part 1a of the hopper or the rake 2 is arranged on the throttle part 1a in proximity to the bottom surface of the hopper 1. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a powdered activated carbon supply apparatus installed in a water treatment plant such as a water treatment facility. More specifically, the present invention relates to a powdered activated carbon supply device that supplies powdered activated carbon to water to be treated in a water treatment plant in order to remove contaminants present in water such as off-flavors and organic matter.

In water treatment plants, water is purified by combining various treatment methods such as physicochemical treatment methods and biological treatment methods. Physicochemical treatment methods include adsorption / exchange separation methods such as activated carbon adsorption and ion exchange, as well as solid-liquid separation methods such as precipitation and filtration, and chemical reaction methods such as chemical decomposition and conversion to innocuous substances. In the activated carbon adsorption method, dissolved organic substances in water are generally removed. This activated carbon adsorption is often performed in emergencies, for example, in addition to removing off-flavors and decolorization, as well as preventing the generation of algae and removing oil, pesticides especially during rice planting, trihalomethanes (including dihalomethanes), It is performed for the purpose of removing other COD-causing substances and is also applied to the treatment of industrial wastewater.
When dry powdered activated carbon is added directly to the water to be treated from the hopper, it floats on the surface of the water and does not come into sufficient contact with the water. In some cases, there is a risk of dust explosion. Is supplied to the water to be treated. At that time, if the water content is increased using a large amount of water, the apparatus becomes larger, and therefore, powdered activated carbon which is usually added to about 50% by weight is used. Patent Documents 1 and 2 are known as such powdered activated carbon supply devices.

In the activated carbon supply apparatus of Patent Document 1, a rake is disposed in a hopper, a pair of delivery rotors having shallow grooves formed on the surface thereof are disposed at intervals in a lower chute communicating with the hopper, and a muddy powder Activated carbon is supplied to the raw water of the treatment tank, and adsorption removal of COD substances contained in the wastewater and deodorization and decolorization of the wastewater are performed.
The activated carbon supply device of Patent Document 2 is intended to prevent muffled powdered activated carbon from entering the bearing portion of the delivery rotor to prevent the rotor from rotating, and the delivery rotor is disposed in the first hopper. The second hopper is faced to the first hopper so that the lower end opening is closed between both end faces of the delivery rotor, and the lower end of the second hopper is inserted into the recessed groove formed in the circumferential direction at both ends of the delivery rotor. Has been.
Japanese Utility Model Publication No. 63-7349 Japanese Utility Model Publication No. 3-23352

Since the powdered activated carbon that has been hydrated has very poor fluidity, in the activated carbon supply devices of Patent Documents 1 and 2, even if shallow grooves are formed on the surface of the pair of delivery rotors, the activated powdered powder becomes a lump and the delivery rotor The powdered activated carbon cannot be smoothly delivered from the delivery rotor due to the adhesion on the surface, and in some cases, the delivery rotor cannot be rotated. Furthermore, in the activated carbon supply device of Patent Document 1, the rake is arranged in the hopper to scrape the powdered activated carbon to the lower chute. However, when the lump of powdered activated carbon is scraped, the powdered activated carbon becomes harder and the rake becomes It may stop rotating. If the rake is forcibly rotated, the drive system of the rake will be damaged, such as breakage or misalignment of the speed reducer, eccentricity of the bearing portion or transmission mechanism.
Therefore, the first object of the present invention is to eliminate the above-mentioned problems of the prior art, and smoothly feed the powdered activated carbon that has been hydrated from the delivery rotor without causing the pair of delivery rotors to become unrotatable. An object of the present invention is to provide a powdered activated carbon supply apparatus capable of satisfying the requirements. Furthermore, the second object of the present invention is to provide a powdered activated carbon supply device capable of increasing the fluidity of the powdered activated carbon contained in the hopper.

In order to achieve the first object described above, the present invention includes a hopper in which hydrated powdered activated carbon is accommodated, a rotatable rake disposed in the hopper to prevent solidification of the powdered activated carbon, and a hopper below the hopper. A provided activated carbon supply housing and a pair of rotatable feed rotors having a rough surface and a rough surface provided between the feed rotors and the hydrated powdered activated carbon in the hopper between the feed rotors. In the apparatus for supplying powdered activated carbon supplied to the water to be treated through the upper scraper and the lower scraper that are in contact with the surfaces of the pair of delivery rotors, the upper scraper is disposed at the center of the pair of delivery rotors. It also serves as a chute for feeding powdered activated carbon to the side.
In order to achieve the second object, another aspect of the present invention is the above-mentioned powder activated carbon supply apparatus, wherein an air injection portion for blowing pressurized air into the powdered activated carbon layer in the hopper is provided at a lower portion or a bottom surface of the hopper. It is characterized by being provided in.

According to the powdered activated carbon supply device (according to claim 1) of the present invention, the powdered activated carbon contained in the hopper is hydrolyzed and poor in fluidity, but is further solidified (bridged) by rotating the rake. Is prevented and fluidity is improved at the same time. The powdered activated carbon with improved fluidity is dropped from the hopper into the activated carbon supply housing below the hopper. A pair of delivery rotors having a rough surface is disposed in the housing with a clearance, and an upper scraper and a lower scraper are in contact with the delivery rotor surface. The upper scraper also serves as a chute for the powdered activated carbon, and the powdered activated carbon sent to the center of the pair of delivery rotors is finally purified in a state of being pressure-biased in a plate shape between the pair of delivery rotors. To be treated water to be treated.
At this time, the powdered activated carbon adhering to the surface of the delivery rotor is scraped off by the lower scraper and supplied to the water to be treated. Therefore, since there is no powder activated carbon that is biased when passing between the rotors on the surface of each delivery rotor, it is possible to smoothly supply the powdered activated carbon newly sent to the center side of the pair of delivery rotors. Thus, the pair of delivery rotors does not become unrotatable. Further, even if the powdered activated carbon cannot be completely scraped off by the lower scraper, and even if a thin layer of powdered activated carbon remains on the surface of the delivery rotor, it can be scraped off completely by the upper scraper.
In the powdered activated carbon supply device according to the second aspect, the lower scraper is disposed so as to be inclined so that a lower interval is narrowed. For example, when the lower scraper is arranged vertically, there is a possibility that the lower scraper completely contacts the pair of delivery rotor surfaces and cannot rotate. However, when the lower scraper is arranged as described above, even if the powdered activated carbon that has been pressure-biased when passing through the pair of delivery rotors adheres to the surface of the delivery rotor, the layered powdered activated carbon is scraped well from an oblique direction. As a result, the possibility of leaving powdered activated carbon on the surface of the delivery rotor is low.

In the powdered activated carbon supply device according to a third aspect of the present invention, the rake is disposed in the narrowed portion of the hopper whose bottom is narrowed inward over the entire circumference. According to the third aspect of the present invention, among the powdered activated carbon moved by the rotation of the rake, the powdered activated carbon that has not been dropped on the housing is pushed upward along the peripheral wall of the hopper. Therefore, unlike the conventional rake in which the powdered activated carbon is raked against the chute, the hydrated powdered activated carbon is not pressed and can be improved in fluidity.
The powdered activated carbon supply device according to claim 4 has a comb-tooth structure in which the rake is formed by connecting upper and lower horizontal plates with a plurality of rods. According to the fourth aspect of the present invention, even if the powdered activated carbon is in a bridging state, the rake has a comb-tooth structure, so that the powdered activated carbon can be unwound without receiving much resistance. .

According to another powdered activated carbon supply apparatus (according to claim 5) of the present invention, the fluidity of the powdered activated carbon is enhanced by the rotational driving of the rake. Furthermore, since the injection part of the pressurized air is provided in the lower part or bottom face of the hopper, the hydrated powdered activated carbon layer in the hopper is pushed up so as to partially float by the pressurized air. Therefore, the compaction phenomenon of the powdered activated carbon that tends to solidify is canceled, and the fluidity of the powdered activated carbon is further enhanced in cooperation with the rotation driving of the rake. As a result, the bulk specific gravity of the activated carbon decreases and the load torque applied to the rake decreases, so that the rake can maintain a stable rotation.
The powdered activated carbon having improved fluidity as described above is dropped from the hopper into the activated carbon supply housing below the hopper, and is supplied to the water to be treated through the pair of delivery rotors.
In the powdered activated carbon supply device according to a sixth aspect, an air header provided with an air nozzle is disposed on the lowermost outer peripheral portion or the bottom portion of the hopper, and the air nozzle is located in the air injection portion. Therefore, pressurized air is blown into the lower part of the powdered activated carbon layer in the hopper from the air nozzle provided in the air header, and the above-described operation is achieved.
Since the powdered activated carbon supply device according to claim 7 is a combination of the activated carbon supply devices according to claims 1 and 5, the action of the invention according to claim 5 is achieved in the hopper, and in the housing. There exists an effect | action of the invention which concerns on Claim 1.

In the powdered activated carbon supply device of the present invention, an upper scraper and a lower scraper are brought into contact with a pair of delivery rotor surfaces. Among them, the upper scraper is also used as a chute for feeding powdered activated carbon between a pair of delivery rotors. Moreover, since the powdered activated carbon adhering to the surface of the delivery rotor is scraped off by the lower scraper, there is no pressure-biased powdered activated carbon on the surface of the pair of delivery rotors. The rotor does not fall out of rotation.
According to the invention of claim 3, the powdered activated carbon that has not been dropped on the lower casing is pushed upward along the side wall of the hopper while being unraveled, so that the powdered activated carbon is not compressed. , Its fluidity can be enhanced.
Another powdered activated carbon supply device of the present invention is provided with a pressurized air injection part at the lower part of the hopper, so that the flowability of the powdered activated carbon is further improved in cooperation with the rake rotation drive. Therefore, the load torque applied to the rake is reduced.

Hereinafter, the present invention will be described in detail with reference to the drawings.
FIG. 1 is a drawing for explaining the outline of various types of powdered activated carbon supply devices. Among them, FIG. 1 (A) shows a supply device of a direct drop method. In the figure, reference numeral 1 denotes a hopper in which hydrated powdered activated carbon is accommodated. A rake 2 is disposed in the hopper 1, and the rake 2 is rotationally driven by a motor 3 through a speed reducer 3 a. A chute 4 is attached below the hopper 1, and a pair of delivery rotors 6 that are rotationally driven by driving of a motor 5 are disposed in the upper part of the chute 4. The lower end opening surface of the chute 4 faces the landing well 7. In this direct drop type supply device, the powdered activated carbon unwound at the rake 2 falls from the hopper 1 between the pair of rotors 6 in the chute 4 to the landing well 7, and the water to be treated in the landing well 7. Is purified.
FIG. 1B shows a supply device of a mixing tank suspension system. In FIG. 1, an activated carbon supply casing (housing) 8 is attached below the hopper 1 shown in FIG. 1A, and a pair of delivery rotors 6 are arranged in the casing 8. Further, a mixing tank 10 supplied with water via an electromagnetic valve 9 is interposed between the casing 8 and the landing well 7. In this mixing tank suspension type supply device, the powdered activated carbon supplied to the mixing tank 10 from the pair of delivery rotors 6 is stirred by the stirrer 12 that is rotated by driving the motor 11 in the mixing tank 10, and then activated carbon suspension. The water to be treated flows into the landing well 7 as a turbid liquid and the treated water is purified.

FIG. 1C shows a distributor type supply device. In the figure, a disperser 13 is provided below the casing 8 shown in FIG. The disperser 13 has an upper surface communicating with the casing 8 and a bottomed bottom surface inclined. In this disperser type supply device, after the activated carbon powder supplied into the disperser 13 from the pair of delivery rotors 6 is dispersed in the water flowing in via the feed water electromagnetic valve 9, the activated carbon dispersion liquid is supplied from the lower part of the disperser 13. As it flows out into the water to be treated.
FIG. 1D shows an ejector type supply device. In the figure, an open / close valve 14 and a throttle valve 15 are connected to a distributor 13 shown in FIG. Further, an ejector valve 16 communicating between the on-off valve 14 and the throttle valve 15 and the lower part of the disperser 13 is connected by piping. In this ejector type supply device, when the on-off valve 14 is fully opened and the pump 17 is driven, water is supplied into the disperser 13 through the on-off valve 14 and the throttle valve 15. At the same time, the activated carbon dispersion is sucked from the lower portion of the disperser 13 by the ejector action of the valve 16 supplied from between the on-off valve 14 and the throttle valve 15 and flows out from the ejector valve 16 to the water to be treated.

The powdered activated carbon supply device of the present invention may adopt any of the above supply methods, and an example of the disperser method shown in FIG.
2 to 4, reference numeral 21 denotes a hopper mount having support legs 21 a at four corners, and the cylindrical hopper 1 is supported on the mount 21. On the upper surface of the hopper 1, an annular charging port for introducing the activated carbon into the hopper 1 is opened. The insertion port is opened and closed by a lid 23 that rotates about the hinge 22. The hopper 1 has a narrowed portion 1a whose diameter is reduced toward the inside along the entire circumference. Triangular support plates 21b are fixed at the four corners of the gantry 21, and the reinforcing members 24 attached to the support plates 21b are in contact with the throttle portion 1a at intervals of 90 °.
Here, as the activated carbon, fine powder having an average particle size of 100 to 300 mesh, a water content of 30 to 60% by weight, and a bulk specific gravity of 0.3 to 0.4 is used. When the water content of the activated carbon is less than 30% by weight, the activated carbon may not be sufficiently dispersed in the disperser 13, and a part thereof may be discharged as a lump. On the other hand, when the moisture content exceeds 60% by weight, wear of a pump (not shown) interposed in the downstream pipe of the disperser 13 becomes significant.
A rake 2 that unwinds the powdered activated carbon that has been hydrated and bridged is disposed so as to be rotatable in the vicinity of the bottom surface inside the hopper 1. The wings of the rake 2 extend close to the inner wall of the hopper 1. Further, a base 26 and 27 for supporting the motor 3 including the speed reducer 3 a constituting the drive system of the rake 2 and the bearing portion 25 a of the thrust shaft 25 are attached adjacently below the hopper base 21. Pulleys 3c and 25b are fixed to the motor output shaft 3b and the thrust shaft 25, and a belt 28 is stretched between the pulleys 3c and 25b. The thrust shaft 25 passes through the gantry 21 and is connected to the center of the rake 2.

A dropping port 29 is opened in the bottom wall near one side of the hopper 1, and the powdered activated carbon uncoiled by the rake 2 is dropped into the activated carbon supply casing 8. The casing 8 is attached below the hopper mount 21, and a pair of delivery rotors 6 are rotatably disposed therein. A pedestal 30 that supports the rotor driving motor 5 and the speed reducer 5a is horizontally mounted between the support legs 21a. Sprockets 5c and 6b are fixed to the motor output shaft 5b and the rotor drive shaft 6a, and a chain 31 is stretched between the sprockets 5c and 6b. Further, a spur gear, which will be described later, is fixed to the drive shaft 6a and the driven shaft 6c of the pair of rotors.
Below the casing 8, the disperser 13 shown in FIG. 1C is attached via a dropping chute 4 communicating with each other. The casing 8 and the chute 4 constitute a housing in the present invention.
Furthermore, an air volume detector 32 that detects the presence or absence of powdered activated carbon contained in the hopper 1 is attached to the front surface of the hopper 1. The hopper 1 on the side facing the motor 5 is provided with an inspection port 33 having an opening for maintenance and inspection of the inside thereof.

As shown in FIG. 5, the rake 2 has a comb structure in which upper and lower horizontal plates are connected by a plurality of rods. Specifically, the center of the lower horizontal plate 2a is fixed to the thrust shaft 25, and the upper horizontal plate 2b is positioned above both sides of the lower horizontal plate 2a, and each of the horizontal plates 2a and 2b penetrates the plurality of horizontal plates 2a and 2b. Are connected by the rod 2c. The bar 2c has a bolt-like structure, and the horizontal plates 2a and 2b are fixed using nuts. The outer peripheral edge of each upper horizontal plate 2 b is located outside both ends of the lower horizontal plate 2 a, and the length between the upper horizontal plates 2 b (the diameter of the rake 2) is slightly shorter than the diameter of the hopper 1.
The rake 2 having a comb-tooth structure is not intended to scrape the powdered activated carbon by its rotation and push it to break the bridge as in the conventional rake. Into a bridged space. For this reason, it is preferable that the rotation of the rake 2 is a very low speed of 0.01 to 1 rpm, and the rotation speed is in the range of 0.1 to 0.5 rpm. Incidentally, if the powdered activated carbon is scraped, the powder becomes very hard and the rake may not rotate. Further, when the rotation of the rake is increased, for example, even if the repose angle of the massive powdered activated carbon is 90 °, the powdered activated carbon may not be dropped on the casing 8 below.

FIG. 6 shows an enlarged view of the pair of delivery rotors 6 and their peripheral members. In the figure, an upper surface mounting plate 8a of the activated carbon supply casing is attached to the pedestal 21 via a bracket (not shown). An opening is formed in the upper surface mounting plate 8 a, and a part of the upper casing 34 whose upper surface and lower surface are opened is immersed in the casing 8. The upper casing 34 has an upper surface mounting plate 34 a attached to the lower surface of the gantry 21 and is disposed symmetrically with respect to the pair of rotors 6 disposed in the casing 8.
The pair of delivery rotors 6 are made of a polypropylene hollow cylinder having the same diameter and closed at both ends, and are supported by a plurality of spokes 35 attached to the drive shaft 6a and the driven shaft 6c therein. As a material for the rotor 6, polyethylene or the like, in particular, ultra high molecular weight polyethylene can be used instead of polypropylene. Concave grooves 36 are formed in the circumferential direction of both end portions of each rotor 6, and several shallow grooves 37 are formed on the outer peripheral surface between the concave grooves 36, and the surface of each delivery rotor 6 is roughened. . In addition, a clearance of 1 to 10 mm, preferably 2 to 6 mm is provided between the pair of delivery rotors 6 so that the powdered activated carbon passes through.

A receiving seat 38 of a bearing 6d that supports the rotor shafts 6a and 6c is fixed to the outer surface of both side walls of the casing 8. As described above, a spur gear 39 with a hub that meshes with each other is fixed to one end of each of the shafts 6a and 6c. Further, the sprocket 6b with a hub is fixed to one end of the rotor drive shaft 6a.
The upper casing 34 is formed of a cylindrical body having a horizontal cross section that is slightly wider than the distance between the drive shaft 6a and the driven shaft 6c of the pair of rotors and whose length is substantially equal to the distance between the concave grooves 36. The lower end edge in the axial direction is located near the upper surface of each rotor 6. Both side plates in the short direction of the upper casing 34 hang downwardly across the concave grooves 36 of the respective rotors 6 with the narrow lower portions facing downward.
On the inner surfaces of both longitudinal plates of the upper casing 34, an upper scraper 40 made of polypropylene that is in contact with the surfaces of the pair of delivery rotors 6 via mounting members is disposed perpendicular to the axial direction of the rotor 6. The upper scraper 40 also serves as a chute for feeding powdered activated carbon toward the clearance between the pair of delivery rotors 6. In addition, on the inner side of both side walls of the casing 8, a lower scraper 42 made of polypropylene that contacts the surfaces of the pair of delivery rotors 6 via brackets 41 is disposed so as to be inclined in the axial direction of the rotor 6. In the inclination of the lower scraper 42, the horizontal interval is narrowed downward.

The operation of the powdered activated carbon supply device shown in FIGS. 2 to 4 is as follows.
The powdered activated carbon added to the hopper 1 is charged from the charging port, and the rake 2 is rotated. The rake 2 having a comb-tooth structure has little rotational resistance even when the powdered activated carbon is hard and bridged, and can dissolve the powdered activated carbon. Further, since the lower portion of the hopper 1 is squeezed inward and the rake 2 is arranged close to the bottom surface of the hopper 1, the powdered activated carbon not dropped on the activated carbon supply casing 8 is It is pushed upward along the side wall of the hopper 1 while being unwound by rotation. In other words, unlike the conventional rake, the rake 2 rotates at a very low speed and moves the powdered activated carbon to the space where the bridged powder is formed by breaking the powdered activated carbon. Such rotation of the rake 2 can enhance the fluidity of the hydrated powdered activated carbon.
The dissolved powdered activated carbon is dropped into the upper casing 34 from the drop opening 29 on the bottom surface of the hopper 1. In the upper casing 34, the lower end edge in the axial direction of the rotor 6 is located in the vicinity of the upper surface of each rotor 6, and both side plates in the short direction hang over the recessed grooves 36 of the respective rotors 6. The activated carbon that has been hydrated does not flow out from the gap between the upper casing 34 and each rotor 6, and has the function of a secondary hopper that retains the activated carbon on the pair of delivery rotors 6.

The upper scraper 40 disposed vertically on the inner surface of the upper casing 34 also serves as a chute for feeding the powdered activated carbon between the pair of delivery rotors 6, and the powdered activated carbon adhering to each rotating rotor 6 is used. There is a scraping action. The pair of delivery rotors 6 having the same diameter is made of polypropylene, and has moderate flexibility unlike a highly rigid material such as nylon, and has excellent sliding characteristics. Adhesion is suppressed. Moreover, since the shallow groove 37 is formed on the surface of the rotor 6, the ball-like (lumped) powdered activated carbon existing in the upper casing 34 can be received and sent out into the groove 37, even if the groove 37 is made of powdered activated carbon. Even if the activated carbons of the same quality are compatible with each other even when filled, the ball-shaped powdered activated carbon does not remain in the upper casing 34 for a long time.
The powdered activated carbon in the upper casing 34 is supplied to the lower disperser 13 following the chute 4 in the form of a plate or slit through the clearance between the rotors 6 by the rotation of the pair of delivery rotors 6. At that time, the powdered activated carbon adhering to each rotor 6 is scraped off by the lower scraper 42. Since the lower scraper 42 is inclined and disposed in the activated carbon supply casing 8 so that the lower portion is narrowed, the possibility of leaving the powdered activated carbon adhering to the surface of the rotor 6 is low. In the disperser 13, the supplied activated carbon is dispersed in the water flowing in via the water supply electromagnetic valve 9 shown in FIG. 1C provided in the water supply pipe 13a, and activated carbon is discharged from the discharge pipe 13b connected to the lower part thereof. It flows out to the to-be-processed water which should be purified with a pump as a dispersion liquid.

Next, as another powdered activated carbon supply apparatus of the present invention, a mixing tank suspension type supply apparatus shown in FIG. 1 (B) will be described. Note that the same members as those in the supply device are denoted by the same reference numerals, and redundant description is avoided as much as possible.
In FIG. 7, reference numeral 51 denotes four frames for supporting the rake drive device and the hopper 1, and upper ends of the frames are connected to each other by a sub-frame 51 a. The frame 51 is provided with a rake drive motor base 52 in the middle and a hopper base 21 in the lower part. The thrust shaft 25 of the rake 2 disposed close to the bottom surface inside the hopper 1 protrudes from the center of the gantry 52, and the motor 3 including the bearing and the speed reducer 3 a is connected via the coupling 53 to the thrust shaft 25. Connected to. The bearing portion 25 a of the rake 2 is supported by a bearing mount 54 provided on the mount 52, and the mount 54 surrounds the coupling 53. An activated carbon charging port 55 is disposed adjacent to the pedestal 54 on one side of the motor pedestal 52.
A guide rail 57 for guiding the electric hoist 56 is horizontally mounted on the sub-frame 51a from the one side end to the outside beyond the other side end. The electric hoist 56 hangs a container bag filled with hydrated powdered activated carbon so as to be able to move up and down. After running on the guide rail 57 and positioned above the inlet 55, the bag string is unwound. Powdered activated carbon is charged into the hopper 1.

A cylindrical hopper 1 having the insertion port 55 is mounted on the gantry 21, and its lowermost portion is squeezed inward over the entire circumference. A reinforcing member 24 is in contact with the lower portion of the hopper 1, and an inspection port 33 and an air volume detector 32 are provided opposite to each other on the outer peripheral wall thereof.
Facing the center between the pair of frame bodies 51 on the front side, the activated carbon mixing tank 10 is installed inside the standing surfaces of the four frame bodies 51. Between the mixing tank 10 and the hopper 1, an activated carbon supply casing 8 in which a part of the upper casing 34 is immersed is interposed. Behind the casing 8, a pedestal 30 for supporting the rotor driving motor 5 and the speed reducer 5a is horizontally mounted. The pair of delivery rotors 6 disposed in the casing 8, the drive system thereof, and the scrapers 40 and 42 are the same as those described above.
An opening communicating with the casing 8 is formed in the upper surface wall of the activated carbon mixing tank 10, and powdered activated carbon is supplied from the pair of delivery rotors 6. In addition, a stirrer 12 for agitating the powdered activated carbon supplied from the delivery rotor 6 together with the water in the mixing tank 10 is attached to the rear part of the mixing tank 10. Further, the activated carbon mixing tank 10 is provided with a water supply port 58 at the upper part of the front wall, a discharge port 59 and a drain port 60 for the activated carbon suspension before and after the lower part of one side surface, and an overflow port 61 at the upper part of one side surface. .
An operation panel 62 is installed on one side surface of the lower part of the frame body 51. The operation panel 62 controls on / off of various motors and the stirrer 12 and the number of rotations thereof, opening / closing of the water supply electromagnetic valve 9 and the like, and the hopper 1 based on numerical data related thereto and a detection signal from the air volume detector 32. The operation status of the powdered activated carbon, such as the presence or absence of powdered activated carbon, the water level in the mixing tank 10 (that is, the amount of water), and the concentration of activated carbon in the suspension, is displayed on the operation panel 62.

Furthermore, another powdered activated carbon supply device of the present invention will be described.
The powdered activated carbon supply device shown in FIG. 8 is provided with an air injection part (air injection port) for blowing pressurized air into the hydrated powdered activated carbon layer in the hopper shown in FIG. 7 at the lower part of the hopper.
8 and 9, an annular air header 71 is attached to the outer peripheral portion of the throttle portion 1 a at the lowermost part of the hopper, and pressurized air is supplied from the compressor 72. In addition, four air inlets 73 are opened upward from the bottom surface of the hopper 1 by 30 to 200 mm at equal intervals in the throttle part 1a of the hopper, and the tip part of the air nozzle 74 provided in the air header 71 is provided for each air. It penetrates inward of the hopper 1 through the inlet 73. From the air nozzle 74, the pressurized air in the range of 0.1 to 0.9 MPa · G is blown into the deposited layer of powdered activated carbon to which water has been added.
As the pressurized air is injected into the powdered activated carbon layer, the activated carbon layer is pushed upward, and the fluidity of the powdered activated carbon is further improved in cooperation with the rotational drive of the rake 2. Moreover, since the air layer is distributed over almost the entire activated carbon layer and the bulk specific gravity of the activated carbon is lowered, the load torque applied to the rake 2 can be reduced. Here, when the pressure of the pressurized air is less than 0.1 MPa · G, the above-described effect is not exhibited so much. On the other hand, when the pressure of the pressurized air is higher than 0.9 MPa · G, the pressurized air can penetrate through the activated carbon layer, and the above-described action cannot be effectively exhibited.
On the other hand, the upper part of the hopper 1 is connected to a dust collector 75 by piping, and fine powdery activated carbon floating above the activated carbon layer in the hopper 1 is collected in the dust collector 75. The dust collector 75 can be installed in any place as long as it does not hinder the operation of the activated carbon supply apparatus, such as being arranged in parallel with the powdered activated carbon supply apparatus or disposed on the hopper stand 21. In addition, the code | symbol 75a in a figure is an inlet of a dust collector, and 75b is an exhaust port.

The explanation related to the powdered activated carbon supply device shown in FIG. 8 will be supplemented below.
The number of the air inlets 73 is not limited, but generally 1 to 8 places are provided in the throttle part 1a, and 2 to 4 places are preferably provided. Further, an air inlet 73 can be opened on the bottom surface of the hopper 1. In that case, the air header 71 is attached to the lower surface of the hopper 1 or in the vicinity of the lower side thereof, for example, in a radial shape such as a linear shape, an annular shape or a cross shape. In some cases, the air header 71 having the above-described shape including the air nozzle 74 can be disposed on the bottom surface in the hopper 1 so as not to contact the rake 2 and the drive shaft 25 thereof.
The amount of pressurized air injected into the activated carbon layer from one or a plurality of air nozzles 74 differs depending on the moisture content of the powdered activated carbon and the amount of the activated carbon, so it is difficult to determine it uniquely. In the hopper 1 of ˜50 m ³ , it is usually in the range of 50 to 500 L / min.
A powdered activated carbon supply device included in the present invention other than the device shown in FIG. 7 can be provided with a pressurized air injection means as shown in FIGS. Moreover, although the dust collector is not illustrated in the powdered activated carbon supply device shown in FIGS. 2 to 4 or 7, a dust collector 75 as shown in FIG. 8 is usually attached. Of course, it is not always necessary to attach a dust collector.

The powdered activated carbon supply device of the present invention is not limited to a batch type, and may be a continuous operation device that continuously or intermittently charges an amount of activated carbon corresponding to the amount charged into the housing into the hopper.
The housing for supplying activated carbon in the present invention is not particularly limited as long as it has a pair of delivery rotors 6 and has a wall structure having a powdered activated carbon inlet and outlet. Therefore, not only the casing 8 including the upper casing 34 and the chute 4 but also the chute 4 and the casing 8 alone shown in FIG. 1 are included in the housing.
In the powdered activated carbon supply device of the present invention, the transmission mechanism between the pair of delivery rotors 6 and the transmission mechanism from the motors 3 and 5 to the rake 2 and delivery rotor 6 are not particularly limited. For example, depending on the position of the rake drive motor 3, a transmission mechanism may be used in which a worm is fixed to the output shaft 3b and a worm gear is fixed to the rake shaft (25).
The rake 2 is not necessarily limited to the comb-tooth structure, and may have a structure in which, for example, upper and lower horizontal plates 2a and 2b are connected by a C-shaped plate material.
The material of the upper scraper 40 and the lower scraper 42 is not particularly limited to polypropylene as long as it is a rigid polymer material having flexibility and wear resistance, such as polyurethane.

  The powdered activated carbon supply device of the present invention is used in water treatment plants such as water treatment facilities to remove off-flavors and decolorization of raw water, to prevent the generation of algae, to remove oil, agricultural chemicals, trihalomethane, other COD-causing substances, etc. Applied to industrial wastewater treatment.

(A)-(D) are the schematic diagrams explaining the outline | summary of the various powder activated carbon supply apparatus of this invention. It is a front view which shows one Example of the powdered activated carbon supply apparatus of this invention. FIG. 3 is a side view of FIG. 2. FIG. 3 is a top view of FIG. 2. FIG. 4 is an enlarged view of the rake shown in FIGS. 2 and 3, (A) is a side view thereof, and (B) is a top view. FIG. 3 is an enlarged view of a peripheral member of the delivery rotor shown in FIG. FIG. The another Example of the powdered activated carbon supply apparatus of this invention is shown, (A) is the front view, (B) is the side view. It is a side view which shows another Example of the powdered activated carbon supply apparatus of this invention. It is the IX-IX line arrow directional view of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Hopper, 1a ... Restriction part, 2 ... Rake, 2a ... Lower horizontal plate, 2b ... Upper horizontal plate, 2c ... Rod body, 6 ... Delivery rotor, 8 ... casing (activated carbon supply housing), 37 ... rotor groove, 40 ... upper scraper, 42 ... lower scraper, 71 ... air header, 73 ... air inlet (air injection) Part), 74... Air nozzle.

Claims (7)

A hopper that contains the powdered activated carbon, a rotatable rake that is placed in the hopper and prevents the powdered activated carbon from solidifying, a housing for supplying activated carbon provided under the hopper, and a slight clearance. A powdered activated carbon which is disposed in a housing and has a pair of rotatable delivery rotors having a rough surface, and the hydrated powdered activated carbon in the hopper passes between the delivery rotors and is supplied to the water to be treated In the supply device, an upper scraper and a lower scraper that contact the surfaces of the pair of delivery rotors are disposed in the housing, and the upper scraper also serves as a chute for feeding the activated carbon powder to the center side of the pair of delivery rotors. A powder activated carbon supply device. The supply device according to claim 1, wherein the lower scraper is disposed so as to be inclined so that a horizontal interval thereof is narrowed downward. The feeding device according to claim 1 or 2, wherein the hopper is squeezed inward along the entire circumference of the lowermost part, and the rake is arranged in the squeezed part. The supply device according to claim 1, wherein the rake has a comb-tooth structure in which upper and lower horizontal plates are connected by a plurality of rods. A hopper that contains the powdered activated carbon, a rotatable rake that is placed in the hopper and prevents the powdered activated carbon from solidifying, a housing for supplying activated carbon provided below the hopper, and a slight clearance. A powdered activated carbon which is disposed in a housing and has a pair of rotatable delivery rotors having a rough surface, and the hydrated powdered activated carbon in the hopper passes between the delivery rotors and is supplied to the water to be treated An apparatus for supplying powdered activated carbon, characterized in that an air injection part for blowing pressurized air into a hydrated powdered activated carbon layer in a hopper is provided on the lower or bottom surface of the hopper. 6. The supply apparatus according to claim 5, wherein an air header including an air nozzle is disposed at a lowermost outer peripheral portion or a bottom portion of the hopper, and the air nozzle is located at the air injection portion. An upper scraper and a lower scraper that contact the surfaces of the pair of delivery rotors are disposed in the housing, and the upper scraper also serves as a chute for feeding powdered activated carbon to the center side of the pair of delivery rotors. The supply device according to claim 5 or 6.

Images