JPS6384653A - System for washing screenings - Google Patents

Abstract

PURPOSE:To obtain a stabilized washing effect by transiently strong the screenings scraped up by a dust collector in a hopper, and quantitatively charging the screenings into the washing machine by a constant-volume feeder to prevent the variations in the load of the washing machine. CONSTITUTION:The screenings scraped up from a sand settling basin 1 through the dust collector 2 is washed by the washing machine 11, and discarded. In this case, the screenings scraped up by the dust collector 2 are transiently stored in the hopper 8 provided between the dust collector 2 and the washing machine 11, and the screenings are quantitatively supplied to the washing machine 11 by the constant-volume feeder 7. As a result, the load of the washing machine can be kept constant, and a stabilized washing effect can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a sieve residue cleaning system for cleaning and disposing of sieve residue generated from a settling basin of a sewage treatment plant or a pumping station.

[Prior Art] When trying to directly transport and dispose of sieve residue generated from a settling basin by truck, there are problems such as odor and leakage of sewage during transportation.

For this reason, once the v6 pickle was washed with a washing machine,
The system uses a dehydrator to reduce the moisture content, which is then transported by truck and disposed of.

[Problems to be Solved by the Invention] However, in the above-mentioned sieve residue cleaning system, the amount of sieve residue generated in the settling basin fluctuates greatly, whereas the amount of sieve residue scraped up from the settling basin varies greatly. was placed directly into the washing machine. For this reason, the load on the cleaning machine varies greatly depending on the amount of sieve residue generated in the sand settling basin, making it difficult to obtain a stable cleaning effect.

Therefore, the present invention has been made to solve the above-mentioned problems of the prior art, and its purpose is to provide a sieve residue cleaning system that can prevent load fluctuations in the cleaning machine and provide a stable cleaning effect. It is.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a sieve residue washing method in which sieve residue scraped up from a sand settling basin via a dust remover is washed and cleaned by a washing machine and disposed of. In the system 1. F: A hopper is provided between the dust remover and the washer to store the sieve residue scraped up by the dust remover, and a meter is provided for quantitatively cutting out the sieve residue and supplying it to the washer. be.

[Function] The sieve residue scraped up by the dust remover is stored in a hopper, from which it is quantitatively cut out by a fixed feeder and is then put in for cleaning.

Therefore, no load fluctuations occur in the washing machine.

[Example] Hereinafter, an example of the present invention will be described in detail based on the accompanying drawings.

In FIG. 1, 1 is a settling basin of a sewage treatment plant, etc., and this settling basin 1 contains l! Dust remover 2 for scraping up 1 pickle! ! 2 are placed. This exception] Machine 2 is a screen 3 installed in the sand basin opposite to the flow.
It is mainly composed of a scraping conveyor 4 for scraping up the sieve residue caught on the screen 3, and a carry-out conveyor 5 for carrying out the scraped sieve residue.

The discharge end of the discharge container 115 of the dust remover 2 is connected to the hopper 8 of the quantitative feeder 7 via the conveyor 6, and is connected to the washer 11 via the discharge port conveyor 10 of the fixed amount feeder 7.
It is connected to the.

The qualitative feeder 7 quantitatively cuts out the sieve residue contained in the hopper 8 using a screw 12 provided at the bottom of the hopper 8 and discharges it from the outlet 9. 13 is a motor for rotationally driving the screw 12.

The washing machine 11 has a primary washing tank 14 into which sieve residue, which is an object to be washed, is first introduced, and a secondary washing tank 15 in which rinsing is then performed. 1
Partition gate 17 in which the center part of 6 is rotatably supported
By rotating the partition gate 17 by half a turn, the objects to be cleaned in the primary cleaning tank 14 are transferred or discharged into the secondary cleaning tank 15.

The cleaning water in the secondary cleaning tank 15 is connected to the primary cleaning tank 14 through the pipe 1.
8 and pump P.

Further, an agitator 19 is attached to the primary cleaning tank 14, and the cleaning water is caused to overflow from the drain port 20 while stirring and cleaning the items to be cleaned.

Secondary cleaning? ! I'15 is provided with a water supply nozzle (not shown), a screen 21 for collecting the sieve residue that is the object to be washed, and a scraping conveyor that scrapes up and discharges the sieve residue caught on the screen 21. 22 are provided. A screw type, drum type, etc. dehydrator 23 is connected to the discharge end of this scraping conveyor 22.
The sieve residue discharged from the discharge port 3 is carried by a conveyor 24 to a disposal hopper 24, from which it is loaded onto a truck and disposed of.

Next, the operation of the above system will be explained. An example of automatic operation of the cleaning machine 2 and the washer 11 is shown in FIG. 2. As shown, remove flt! 2 is controlled based on a 24-hour timer and a level meter 26 attached to the hopper 8, and the level of the sieve residue in the hopper 8 is set to 88.
If it is above 88, it will not be operated, but if it is not 88 or above, the conveyor 6 and dust remover 2 will be opened and operated at a predetermined time.

As a result, the sieve residue scraped up from the sand settling pond is fed into the constant m feeder 7.
It will be put into the hopper 8.

Also, hopper 8 does not operate when the level is 88 or higher.
This is to prevent the sieve residue from overflowing.

On the other hand, the cleaning 111 is controlled based on the level meter 26 of the hopper 8. If the level is H or higher, conveyor 2
4. The operation of the dehydrator 23, the washing unit 11, and the conveyor 10 are started in sequence, and the quantitative feeder 7 is operated for a predetermined time (0 to 3 minutes). As a result, the sieve residue is transferred to the primary washing tank 14 of the washing machine 11.
It will be put inside. After the conveyor 10 starts operating, it is washed for a predetermined period of time (0 to 10 minutes) and then the partition gate 17 is turned half a turn to exchange the sieve residue in the primary washing tank 14 into the secondary washing tank 15. As a result, the sieve residue undergoes primary washing (washing and agitation) and secondary washing (rinsing), and in a relatively clean state is scraped up on the TFL lift conveyor 22, and dehydrated to a water content of about 60% in the dehydration stage 23. After that, it is stored in the waste hopper 25. When the level of the hopper 8 is equal to or higher than L, the quantitative feeder 7
is further operated for a predetermined period of time, and after washing for a predetermined period of time, the partition gate 17 is rotated half a rotation, and this cycle is repeated.

If the level of hopper 8 is not above L, conveyor 1o
is stopped, and the scraping conveyor 22 of the washer 11 scrapes up the llI residue from the secondary cleaning Wi 15 for a predetermined period of time, and then the washer 11 dehydrates! ff23 and the conveyor 24 are sequentially stopped. In this way, since the quantitative feeder 7 and subsequent parts are operated depending on the level of the hopper 8, energy-saving operation is achieved.

Note that the partition gate 17 may be of a reciprocating type instead of a rotating type.

[Effects of the Invention] In summary, the present invention exhibits the following excellent effects.

(1) Excluded! ! 3! Since the metering feeder is placed between the machine and the washer, the load on the washer can be kept constant and a stable cleaning effect can be obtained.

(2) Since the metering feeder has a hopper that stores the sieve residue scraped up by a removal gate, even if a large amount of sieve residue is scraped up at times, it will not cause trouble to the washer, etc. Does not occur.

(3) Also, it is possible to operate the washing machine etc. based on the level in the hopper, which is economical.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a flowchart for automatically operating a dust remover and a washer. In the figure, 1 is a sand settling basin, 2 is a dust remover, 7 is a quantitative feeder, and 8 is a hopper.

Claims (1)

[Claims] In a sieve residue cleaning system in which sieve residue scraped up from a sand settling basin via a dust remover is washed by a washing machine and disposed of,
The feature is that a hopper is provided between the dust remover and the washer to accommodate the sieve residue scraped up by the dust remover, and a stationary feeder is installed to quantitatively cut out the sieve residue and supply it to the washer. A sieve residue cleaning system.