JPH0260381B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is directed to the removal and cleaning of organic components adhering to waste sand that has been precipitated and removed in a settling basin of a sewage or human waste treatment plant, and the separation and removal of contaminated waste such as sludge. The present invention relates to a sand washing device that performs sand cleaning.

In general, the sewage deposited in settling ponds at sewage and human waste treatment plants is contaminated with impurities such as vegetable scraps and organic matter from human waste, as well as small pieces of wood, vinyl, etc. Since they can cause secondary pollution such as foul odors, dirt in the vicinity due to dripping sewage, and contamination of groundwater due to landfill disposal, these adhering organic substances and contaminants can be separated and removed, and clean sand can be efficiently recovered. The current situation is that there is a demand for the development of a device.

This invention was made in view of the above circumstances,
It is an object of the present invention to provide a sand washing device which is characterized in that it separates dirt from sand in dirty sand and washes the sand from which dirt has been separated and removed by countercurrent contact with washing water. .

Embodiments of the present invention will be described in detail below based on the drawings.

1 to 3 respectively show a plan view, a longitudinal side view, and a front view of a first embodiment of the sand washing device of the present invention. It is a conical drum, and driven rollers 2, 2 having the same diameter are provided at two places on its outer circumference so that it can be rotatably hung horizontally. The position is maintained by a drive roller 3 and a support roller 4. The friction torque of the drive roller 3 which is interlocked from the motor 5 with a speed reducer through the transmission chain 6 allows the roller to rotate from 4 to 6 times per minute. In this case, the transmission means is not limited to a friction roller or a chain mechanism; for example, the transmission means is a drum 1.
A large gear may be attached to the outer periphery of the drum 1, and a pinion may be attached to the prime mover side to transmit rotation, or a pinion gear may be attached to drum 1 and a sprocket wheel may be attached to the prime mover side to transmit rotation. Of course, it is possible.

On the other hand, the tip, middle, and end of the drum 1 are provided with passages that are concentric with the center of rotation of the drum 1 and whose diameters gradually increase toward the tip of the drum 1. Baffle plates 7, 8, and 9 having water ports 7a, 8a, and 9a are installed therein, and cleaning tanks 10 and 11 are formed between these baffle plates 7, 8, and 9. The cleaning water A supplied into the cleaning tank 11 through the cleaning water supply pipe 12 connected to the cleaning tank 11 on the distal end overflows the water passage port 8a of the baffle plate 8 and flows into the cleaning tank on the distal end side. 10, and further overflows the water inlet 7a of the baffle plate 7 and flows to the drainage gutter 13 outside the drum (outside the system).

Further, a truncated conical screen 14 that expands in a direction opposite to the slope of the drum 1 is disposed within the tip side cleaning tank 10, and a separation tank 15 is formed within this screen 14. A cylindrical transfer case 16 passes through the center of the drum 1 in the separation tank 15, and has a dirt supply port 17 at the distal end and a waste discharge port 18 at the distal end. This transfer case 16 has a screw conveyor 19.
is rotatably built in, and a drive shaft 19a of this screw conveyor 19 protrudes from the distal end, and a driven sprocket 2 attached to this protrusion
0 and a drive sprocket 22 mounted on the shaft 21 of the drive roller 3.
The screw conveyor 19 can be rotated through the screw conveyor 19. Note that a drum screen 24 is formed in a part of the transfer case 16 in the separation tank 15 to separate dirt and sand in the dirty sand. Furthermore, dirt scooping buckets 25, 25, . There is a hopper 26 for receiving waste.
is formed so that the waste in the separation tank 15 can be returned to the transfer case 16.

On the other hand, a plurality of sand buckets 27, 27, .
8 are formed at appropriate intervals, and transfer chutes 30, 30 are formed for transferring the sand falling from these buckets 27, 28 to the drum end side cleaning tank 11 or to the receiving tray 29 outside the drum. In addition, a plurality of stirring blades 31, 31 are provided at appropriate intervals on the inner peripheral wall of each cleaning tank 10, 11.
... are formed, and the sand in the cleaning tanks 10, 11 is stirred by these stirring blades 31, 31....

In the sand washing apparatus of the present invention configured as described above, the dirty sand introduced into the dirty sand supply port 17 by the conveyor 32 flows into the transfer case 16 and is transferred to the tip of the drum 1 by the screw conveyor 19. The waste is first separated into dirt and sand by the drum screen 24, and the dirt moves inside the transfer case 16 as it is and is discharged to the outside from the discharge port 18. On the other hand, drum screen 2
The sand separated by screen 4 contains fine dirt, but these dirt are separated by screen 2.
4, the separated fine dirt moves to the expansion side along the slope of the screen 24, and is transferred to the dirt scooping buckets 25, 25.
After being scraped up, the waste falls into the dirt hopper 26 due to its own weight, is thrown into the transfer case 16 again, and is taken out from the discharge port 18. On the other hand, the sand separated by the screen 14 falls into the front end cleaning tank 10, moves to the end of the drum due to the rotation and tilt of the drum 1, and comes into countercurrent contact with the cleaning water A overflowing from the end. In addition, the stirring blade 31,
31... is mixed and washed, and the sand is pumped into a bucket 27.
sent to. The sand that has been raked up to a certain position by the sand pumping bucket 27 is drained, and when it reaches the angle of repose for the sand or higher, it is turned over and transferred to the end-side cleaning tank 11 by the chute 30. . The sand that has been primarily washed is washed secondarily with fresh washing water in the terminal washing tank 11 in the same manner as described above, and then scooped up while being drained by the sand lifting bucket 28 and sent to a drum in the chute 30. The sand is sent to a receiving tray 29 outside the system as cleaning sand. Note that the organic components separated from the sand are suspended from the distal side cleaning tank 11, pass through the water passage port 8a of the baffle plate 8, go to the distal side cleaning tank 10, and further pass through the separation tank 15 and pass through the baffle plate 7. It flows down the water port 7a and is discharged.

The separated waste is sent to a separate treatment device (not shown) using a belt conveyor or the like, and the overflow wastewater containing suspended matter is returned to the settling basin (not shown) for treatment.

FIG. 4 shows a second embodiment of this invention.
By disposing the transfer case 16 in the separation tank 15 from the tip side of the drum 1, the dirty sand is dropped into the separation tank 15 from the discharge port 18' of the transfer case 16,
This is a case where the filth separated by the separation tank 15 is scraped up by the filth scraping bucket 25, and the part that falls under its own weight is discharged out of the system by the filth chute 33.

FIG. 5 shows a third embodiment of this invention.
This is a case where the dirty sand is directly introduced into the separation tank 15 without using the transfer case 16 and the screw conveyor 19. That is, the sludge inputting chute 34 faces into the separation tank 15 from the front end of the drum, and the sludge is introduced into the separation tank 15 through the sludge inputting chute 34. Note that 35 is a drum. This is a stand for horizontally mounting 1.

Further, FIG. 6 shows a fourth embodiment of the present invention, in which dirty sand is separated more efficiently. That is, this is a case where the shower pipe 36 is disposed above the dirty sand thrown into the screen 14 and sprays pressurized water to promote separation. In this case, if dirt becomes entangled with the screen 14 of the separation tank 15, a backwashing pipe 3 is installed above the outer periphery of the separation tank 15.
7 and spray the screen 14 with pressure water.
The deposits on the screen 14 can be dropped into the separation tank 15 to keep the screen 14 clean at all times.

As explained above, according to the sand washing device of the present invention, waste such as sludge mixed in the waste sand is separated by the separation tank, and sand with attached organic components etc. is separated by the stirring blade. This combination of cleaning action and countercurrent contact with cleaning water as the weight of the sand moves along the slope makes it possible to reliably separate the dirty sand from the filth and remove the organic matter adhering to the sand. Also, since each cleaning tank has an independent structure, the sand that falls from the separation tank into the cleaning tank is washed and drained once, similar to the process of rinsing and dehydrating the reservoir in a washing machine. After that, the sand is washed and drained again, so that organic matter adhering to the sand can be efficiently removed with a small amount of washing water. Furthermore, as mentioned above, since the amount of washing water is small, the running cost is low, and the amount of washing water is also reduced accordingly, so there are excellent effects such as less sand runoff and a better sand recovery rate. Moreover, by combining multiple functions into one compact device, the volume is small, and the installation area is correspondingly small, and the drive unit is relatively slow, so
Its utility value is remarkable because it has the advantage of less friction on the main body, etc., and easier operation.

The device of this invention (small diameter 1200mm, large diameter 1400mm)
mm, length 1400 mm) at 2 to 8 revolutions per minute, and the amount of washing water was equivalent to 7 times the amount of dirty sand.
It was confirmed that the SS and COD removal rate was 85-90% or more, and the amount of washing water was reduced to 1/10 compared to conventional equipment of this type.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing a first embodiment of the sand washing device of the present invention, FIGS. 2 and 3 are a vertical side view and a front view thereof, respectively, and FIG. 4 is a diagram showing a first embodiment of the sand washing device of the present invention. FIG. 5 is a vertical side view showing a third embodiment of the sand washing device of the present invention, and FIG. 6 is a longitudinal sectional view of the main part showing the fourth embodiment of the sand washing device of the present invention. FIG. In the figure, 1... truncated conical drum, 7, 8, 9
...Baffle plate, 7a, 8a, 9a...Water port, 10, 1
DESCRIPTION OF SYMBOLS 1...Cleaning tank, 12...Washing water supply pipe line, 14...Conical screen, 15...Separation tank, 16...Transfer case,
17... Dirty sand supply port, 18... Dirty discharge port, 19... Screw conveyor, 24... Drum screen, 2
5... Bucket for scooping up filth, 27, 28... Bucket for lifting sand, 30... Shute, 31... Stirring blade,
34...It is a waste input chute.

Claims (1)

[Scope of Claims] 1. At the tip, middle, and end of a truncated cone-shaped drum that is horizontally suspended in a rotatable manner, the diameter of the drum is concentric with the center of rotation, and whose diameter increases toward the tip of the drum. A plurality of cleaning tanks are formed by disposing a baffle plate having a water passage port with a diameter gradually increasing, and washing water supplied from the end of the drum is sequentially overflowed through the water passage port of the baffle plate. A conical screen that expands in the direction opposite to the slope of the drum is provided in the cleaning tank at the tip of the drum, and a separation tank formed in the conical screen is filled with dirt. forming a sand input part and a discharge port for discharging the waste separated from the dirty sand, and forming a plurality of buckets opening in the rotational direction of the drum on the inner wall on the distal side of each of the cleaning tanks, A transfer chute is formed to scrape up the sand separated from the dirty sand in each of the cleaning tanks and return the sand falling from these buckets into the cleaning tank at the end of the drum or to the outside of the system, and the rotation of the truncated cone-shaped drum In this way, the filthy sand put into the separation tank is separated into filth and sand and the filth is discharged, and the sand separated from the filthy sand is separated from the washing water that overflows from the end side in each washing tank. 1. A sand washing device characterized by cleaning by contact with a flow of water. 2. The sand washing device according to claim 1, wherein dirt buckets are formed on the inner circumferential wall at the expanding end of the conical screen at appropriate intervals and can be connected to the discharge port. 3. The sand washing device according to claim 1, wherein a dirty sand inlet is formed in a transfer case that incorporates a screw conveyor that is rotatably disposed in the center of the truncated cone-shaped drum. 4. The sand washing device according to claim 3, wherein a drum screen is formed in the transfer case located in the separation tank to separate sand from dirt in the waste sand. 5. The sand washing device according to claim 1, wherein stirring blades are formed at appropriate intervals on the inner circumferential wall of each of the washing tanks.