JPH04126556A - Wet scrubber for screen sludge - Google Patents

Abstract

PURPOSE:To completely and surely perform washing by arranging a screw conveyor for supplying recovered screen sludge to a washing tank and providing a crushing device which is mainly constituted of a crushing roller for crushing undissolved muck contained in the recovered screen sludge and simultaneously driving the crushing device together with the screw conveyor. CONSTITUTION:An agitation washing means 4 is provided to a washing tank 1 so that the recovered screen sludge introduced into this tank is washed. Further a crushing device 5 is arranged in the tank to the position of a discharge port in the terminal of a screw conveyor 2. The screw sludge discharged from the screw conveyor 2 is introduced into the washing tank 1 via the crushing device 5. When the axis 23 of the screw conveyor is turned by a driver 3, both the screw 22 of the screw conveyor and a crushing roller 51 are driven in the reverse direction with each other. This crushing roller 51 is provided so that its lower part is immersed in the water surface and also a pressing plate 6 is provided so that it is pressure-welded to one part of the outer circumferential face of the crushing roller under the water surface. Thereby muck such as excretions undissolved in the recovered screen sludge is completely removed in the washing tank.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an apparatus for crushing undissolved substances from screen residue collected from a dust remover and cleaning it more reliably.

[Conventional technology]

The wastewater flowing into the sewage treatment plant is used to remove screen residue, which is a foreign substance, using a dust remover, and then sent to a treatment tank, where it undergoes biological treatment through aeration, etc., and the collected screen residue is put into the cleaning tank. After cleaning, scraping, and dehydrating if necessary, the waste is disposed of in a landfill or incinerated.

[Problem to be solved by the invention]

The screen residue is put into the washing tank, stirred with washing water, washed, and then collected again for final disposal. be.

Therefore, it contains a large amount of undissolved substances such as human feces.

Human excrement is often not crushed simply by stirring with a separator in the cleaning tank or by high-pressure water jetting, etc., and after cleaning,
Since the screen residue collected from this tank also contains undissolved human excrement, if this is dumped in a landfill or the like, it may cause secondary pollution such as bad odors.

The purpose of the present invention is to perform cleaning more reliably by forcibly crushing the undissolved crushed material using a crusher immediately before introducing the screen residue collected by a dust remover into a cleaning tank. do.

[Means for resolving division issues]

The present invention has been made to achieve the above object, and includes a screw conveyor for supplying recovered screen residue to a cleaning tank equipped with an agitation cleaning means and a scraping and discharging means, and a screw conveyor is provided for supplying recovered screen residue to a cleaning tank equipped with an agitation cleaning means and a scraping and discharging means. The gist is that a crushing device mainly consisting of crushing rollers for crushing undissolved dirt in the collected screen residue is provided and is driven simultaneously with the screw conveyor.

[For production]

When the screen residue collected by the dust remover is supplied to the cleaning tank via the screw conveyor, a crusher is placed between the screw conveyor and the cleaning tank, which is simultaneously driven by the drive device of the screw conveyor. Uncrushed dissolved substances such as human excrement in the screen residue are also crushed and then thrown into the cleaning tank. Therefore, the screen residue is sufficiently washed by stirring or high-pressure water injection in the cleaning tank, and only the screen residue that cannot be crushed can be recovered. Further, the crusher is disposed so that a part thereof is immersed in the washing water of the washing tank, so that when the crusher is driven, the crusher is automatically washed with the washing water, so that continuous driving is possible.

〔Example〕

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The screen residue cleaning apparatus of the present invention will be explained below based on embodiments shown in the drawings.

In the figure, 1 is a cleaning tank for screen residue, into which cleaning water is supplied up to a preset water level, and water is supplied so as to maintain that water level. Cleaning 4111 is equipped with screen pickling equipment such as a screw conveyor that feeds the screen residue collected from the dust remover! 12 are arranged. Then, the screw 22 rotatably disposed inside the trough 21 is driven to rotate by a drive unit [3] disposed outside the cleaning tank.

A stirring cleaning means 4 is provided in the cleaning tank 1 so that the recovered screen residue put into the tank is cleaned. As this agitation cleaning means 4, a large number of high-pressure water injection nozzles are arranged above the cypress as shown in the figure, and the method of cleaning with high-pressure cleaning water sprayed from the nozzles 4, or a method of stirring a separator etc. (not shown). The screen sludge that has been put into the tank can be cleaned using one or more suitable methods, such as installing a filter at or below the water level in the tank and stirring it together with the cleaning water by driving this separator, or using one or more other suitable methods. make sure that it is thoroughly cleaned.

In addition, a crushing device 5 is arranged in the cleaning tank and at the eave end discharge port position of the screw conveyor 2, and the screen residue discharged from the screw conveyor 2 passes through the crushing device 5 and enters the cleaning tank.
Let it be thrown inside. As shown in the first embodiment shown in FIGS. 1 and 2, this crushing device 1i5 has a crushing roller 51 rotatably supported in a washing tank parallel to the shaft 23 of the screw conveyor 2, and crushing roller shaft 52
gear 53. 54 are fixed and the gears are meshed with each other. As a result, when the screw conveyor shaft 23 is rotated by the drive device 3, the screw 22 of the screw conveyor and the crushing roller 51 are driven in opposite directions. The crushing roller 51 is disposed so that its lower part is immersed in the water surface, and a press grate 6 is disposed so as to come into pressure contact with a part of the outer peripheral surface of the crushing roller below the water surface. This press plate 6 is swingably supported in the cleaning tank 1 by a shaft 61, and supports a weight 62 at the other end through a wire 63, and transfers the load of this weight 62 to the crushing roller of the press plate 6. This acts as a pressing force to crush and crush the screen residue that is introduced between the crushing roller 51 and the press plate 6 from the screw conveyor. This crushing roller 51 is rotated counterclockwise so that the screen residue is easily caught between the press plates, and has a protrusion on its outer periphery. As a result, unshredded human excrement, etc., is reliably crushed and supplied into the cleaning tank, so that the screen residue can be cleaned more reliably, and even if crushed human excrement, etc. adheres to the crushing roller, the roller will not rotate. It will be naturally washed with washing water.

Further, as the crushing device 5, the second embodiment shown in FIGS. 3 and 4 can also be adopted. In this case, a pressing roller 8 is arranged opposite to a crushing roller 51 provided in the same manner as in the first embodiment.
This pressing roller 8 is rotatably supported at the lower end of a swinging pressing link 81, and a weight or other pressurizing device 82 is provided at the upper end of the link 81, which is swingably supported at a part of the cleaning tank. The pressure roller 8 is pressed against the crushing roller side with the required pressure by the action of the roller 51.8, and as a result, human excrement, etc. thrown in from the screw conveyor is crushed between both rollers 51.8 and placed in the cleaning tank. It is supplied to

Human excrement, etc. are crushed in this way, and the washed screen residue is discharged outside the scraping tank by a screen cleaning scraping and discharging means 7 provided inside the cleaning tank and on the opposite side of the screw conveyor installation position. It is.

Note that 9 is a drain port for draining dirty water from washing.

〔Effect of the invention〕

In the screen residue cleaning device of the present invention, the screen residue collected from the dust remover is crushed by a crushing device driven in synchronization with the screw conveyor immediately before the screen residue is introduced into the cleaning tank from the screw conveyor. Also, dirt such as undissolved human excrement in the collected screen residue can be completely removed in the cleaning tank, and the screen residue can be cleaned more reliably.

[Brief explanation of drawings]

The drawing shows an embodiment of the screen residue cleaning device of the present invention,
Figures 1 and 2 show the first embodiment, Figure 1 is a longitudinal section, Figure 2 is a plan view, Figures 3 and 4 are the second embodiment, and Figure 3 is a longitudinal section. FIG. 4 is a plan view. 1 is a cleaning tank, 2 is a screw conveyor, 3 is a drive device,
4 is an agitating cleaning means, 5 is a crushing device, 51 is a crushing roller,
6 is a press plate, 7 is a scraping and discharging means, and 8 is a pressing roller. Patent applicant Hitachi Kiden Kogyo Co., Ltd. Figure 1

Claims (3)

[Claims] (1) A screw conveyor is provided to supply the collected screen residue to a cleaning tank equipped with an agitation cleaning means and a scraping and discharging means, and crushing is performed to crush undissolved dirt in the collected screen residue fed from the screw conveyor. A screen sludge cleaning device characterized in that a crushing device mainly consisting of rollers is provided and is driven simultaneously with the screw conveyor. (2) The screen residue cleaning device according to claim 1, wherein the crushing device comprises a crushing roller and a press plate pressed against the crushing roller with a required pressure. (3) The screen residue cleaning device according to claim 1, wherein the crushing device comprises a pressing roller that presses against the crushing roller with a required pressure.