JPS5910262B2 - Screen scum cleaning method and device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for cleaning power of screen scum and an apparatus therefor.

Conventionally, the screen scum collected from sewage treatment plants is dirty, so the post-treatment process is carried out after cleaning.

Therefore, the screen scum is supplied to a cleaning device for cleaning, but the screen scum normally passes through a cleaning tank equipped with an agitation cleaning device only once.

There is a drawback that it is difficult to sufficiently clean the screen by passing through the heavily soiled screen cleaning tank once.

The present invention has been made in view of this, and after cleaning the screen scum supplied into a cleaning tank equipped with an agitation washer and a dust remover according to the degree of dirt, the cleaning screen scraped up is removed from the tank. A method for cleaning screen dregs, characterized in that the screen dregs are selectively carried out or re-injected into a cleaning tank via a conveyance trough for re-cleaning, and agitation cleaning for cleaning the input screen dregs. A cleaning machine and a dust remover for scraping up the screen residue after cleaning are installed in the cleaning tank, and a carry-out machine that can rotate forward and backward is attached to the upper end of the dust remover, and a carry-out conveyor is attached to one end of the carry-out machine and a carry-out conveyor is attached to the other end of the carry-out machine. The gist of the present invention is to provide a screen dregs cleaning device which is provided with a transport trough for re-injection into the cleaning tank and can be re-cleaned depending on the degree of contamination of the screen dregs.

The present invention will be explained below based on illustrated embodiments.

In the figure, 1 is a cleaning tank for cleaning screen scum, dirt, etc., and the cleaning tank 1 is continuously or intermittently supplied with screen scum, etc. to be cleaned by a conveyor 2, etc. Washing water is supplied, and the screen thrown into the tank is agitated and washed by an agitation washer 3 such as a balsator provided in the tank.

In addition, a dust remover 4 is provided in the cleaning tank 1 at an arbitrary position opposite to the carry-in conveyor or away from the carry-in conveyor,
The screen residue washed in the tank is scraped up and carried out of the tank by a carry-out machine 5 adjacent to the dust remover 4 and provided outside the tank.

Inorganic substances with heavy specific gravity such as sand and pebbles settle on the bottom of the tank after cleaning, but this can be done by opening the opening/closing damper 10 installed at the bottom of the cleaning tank and below the dust remover. The material is discharged to the outside of the tank by a material discharge conveyor 6.

The above-mentioned unloading machine 5 uses a belt conveyor or the like capable of forward and reverse rotation, and a conveyor 8 is installed on one end side of the unloading machine 5 through a dehydrator 7 or directly adjacent to it, and when the unloading machine 5 rotates in the normal direction, a cleaning tank is installed. The screen residue washed inside is scraped up by a dust remover 4, passed through a carry-out machine 5, dehydrated by a dehydrator, and then carried out by a carry-out conveyor. However, if the screen residue cannot be sufficiently cleaned by passing through this cleaning tank only once, The unloading machine 5 is reversed, and the screen residue scraped up by the dust remover passes through this unloading machine 5 and is transferred to a conveying trough (adjacent to the other end of the unloading machine).
or conveyor) 9.

This transport trough 9 is arranged along the cleaning tank 1,
The screen waste supplied into the trough is transferred through the trough and thrown into the cleaning tank 1 again.

In this case, the tip of the conveying trough is placed as far away as possible from the starting end of the cleaning tank, that is, from the dust remover, and is cleaned again with a screen scraper or the like that is re-introduced together with the cleaning water, and then scraped up by the dust remover.

During this re-cleaning, the carry-in conveyor 2 may be stopped.

When using this device, it is also possible to clean the dirty sand. In this case, by leaving the retractable damper 10 open, the dust in the dirty sand is washed and separated by the dust remover, and the washed sand is continuously washed. The sediment is discharged by a conveyor.

The shaving damper can be cleaned while closed, or it can be opened after cleaning to discharge precipitated sand, stones, etc.

In addition, in the case of cleaning the screen scum, the cleaning screen scum that is conveyed is sometimes dehydrated for re-cleaning in the above-mentioned conveying trough or in a dehydrator connected thereto, thereby making the re-cleaning more effective.

Therefore, the present invention scrapes up the screen scum washed by the agitation washer with the dust remover, and allows switching between re-input and dewatering removal using the forward-reversible unloading machine, and washes the re-injected screen dregs with the trough. A damper is installed to allow the water to flow back into the cleaning tank and to selectively wash sludge and screen scum, allowing the cleaning time to be selected depending on how dirty the screen scum is and for continuous transport. Or,
Since cleaning can be carried out repeatedly for a certain period of time, there is an advantage that cleaning of screen scum can be carried out sufficiently regardless of the degree of contamination.

[Brief explanation of the drawing]

FIG. 1 is a vertical front view, FIG. 2 is a plan view, and FIG. 3 is a vertical side view. 1...Cleaning tank, 2...Carry-in conveyor, 3
...Agitator washer, 4...Dust remover, 5.
... Carrying out machine, 6... Sediment discharge conveyor, I... Dehydrator, 8... Carrying out conveyor, 9... Conveying trough, 10...Dunbar.

Claims (1)

[Scope of Claims] 1. Screen scum supplied into a cleaning tank equipped with an agitation washer and a dust remover is cleaned depending on the degree of contamination, and the washed screen scum that has been scraped is carried out of the tank or A method for cleaning screen scum, characterized in that the screen dregs are selectively re-injected into a cleaning tank via a conveyance trough for re-cleaning. 2. A cleaning tank is equipped with an agitation washer that cleans the screen scum that has been thrown in, and a dust remover that scrapes up the screen dregs after cleaning. An unloading conveyor is installed at one end of the machine.
A screen scum cleaning device that has a transport trough at the other end for recharging into the cleaning tank, allowing re-cleaning depending on the degree of dirtiness of the screen scum.