JP2872330B2 - Screen residue dehydration method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention dehydrates screen residue collected from a waterway such as a sewage treatment plant or a pumping station and dehydrates the screen residue to facilitate the next treatment. The present invention relates to a dehydration method for bagging.

[Conventional technology]

In a sewage treatment plant, a pumping station, and the like, solids mixed in the sewage are separated from the sewage to separately treat the solids and the sewage.

This solid is generally called a screen residue,
Since the sewage is scraped and collected by a dust remover, the water content is extremely high, and in this state, it is impossible to discard, incinerate, or carry out to the dump position. For this reason, the collected screen residue is dehydrated to a required moisture content.

As a dewatering device for this screen residue,
-43049 and JP-A-1-117118.

After dewatering, this dewatering device is designed to push up into a pipe with an upward slope from below to transfer it to a predetermined position, and since the pipe is almost sealed, the odor of the screen residue is removed in all directions. Spattering can be prevented.

[Problems to be Solved by the Invention] However, even if the screen residue is dehydrated and conveyed by the action of a pressurized dehydration piston in a sealed conveyance tube, it is stored in a hopper and then loaded on a truck or the like for incineration or dumping. Therefore, it is opened during loading and transporting to a truck or the like, and is scattered or odor is scattered in all directions.

An object of the present invention is to provide a method for dewatering a screen residue that can be bagged by a fixed amount so that the screen residue after dehydration does not come into contact with the atmosphere, and the next transportation, incineration and disposal can be easily performed. .

[Means for solving the problem]

In order to achieve the above object, a method for dewatering screen residue according to the present invention comprises the steps of: pressing a screen residue dehydrated by pressure in a pressure dehydration device onto a turntable through a chute in a conveying pipe connected to the pressure dehydration device. It is characterized in that it is directly packed in a bag arranged in the bag while measuring.

[Action]

The screen residue collected from a sewage treatment plant or the like is subjected to a desired dehydration by a pressure dehydrator, and then is transported in a transport pipeline connected to the pressure dehydrator, and at an upper end of the transport pipeline. Through the provided chute, the bag is directly packed in a bag arranged on the turntable while being measured.

The amount of screen residue to be bagged is measured by a measuring device, and when the set amount is reached, bagging is stopped, the bag mouth is closed, and the turntable is rotated for conveyance.

For this reason, the screen residue after dehydration is packed in a fixed amount in a bag, so that it can be easily transported or dumped to an incineration plant, etc.
In addition, the odor can be prevented from scattering.

〔Example〕

Hereinafter, a method for dewatering a screen residue according to the present invention will be described based on the illustrated embodiment.

In the figure, 1 is a hopper of a screen residue dewatering / conveying device, which continuously or intermittently supplies screen residue collected and recovered from a water channel of a sewage treatment plant, a pumping station or the like,
The hopper 1 is supplied to a pressure dehydrator.

The hopper 1 is provided so as to protrude from an upper portion of the pressure dehydration device 2, and the pressure dehydration device 2 includes a hydraulic cylinder 3 for squeezing and dewatering the screen residue supplied from the hopper 1.

In this case, a screw can be used instead of the hydraulic cylinder 3.

The hydraulic cylinder 3 is provided in the dewatering device, and a piston 3a is provided at the rod end of the cylinder 3. The piston 3a is advanced and retreated in the cylindrical dewatering device 2 by operation of the cylinder, and is supplied from the hopper 1. Screen residue is depressed intermittently by pressing.

For this reason, a small hole or a slit-shaped drainage hole (not shown) is formed in the lower peripheral surface of the cylindrical dehydrating device 2 corresponding to the lower position of the hopper 1.
On the extension of the dewatering device 2 on the further downstream side, a cylindrical drainage screen is provided as necessary.

A tubular and bent back pressure portion B is connected to the downstream end of the pressurizing and pressing portion A of the dehydrating device having the hydraulic cylinder 3,
The back pressure plate 4 is provided on the bent outer surface of the back pressure portion B, and the back pressure portion B is formed in a cylindrical shape, and a tapered transfer pipe line 5 or a transfer distance comparison is made such that the tip is widened as necessary. At the same time, a parallel pipe is connected, and an opening is provided on the outer surface of the transfer pipe. The back pressure plate 4 is fitted into the opening, and the back pressure lower end is swingably supported by a shaft. A back pressure hydraulic cylinder 6 is provided via a bracket protruding from the upper back surface of the back pressure plate 4, and the back pressure plate 4 is advanced into the pipeline by operating the cylinder 6 in accordance with the pressing force. A required back pressure is applied to the screen residue supplied into the inside.

The back pressure can be adjusted by the pressure of the hydraulic pressure applied to the cylinder 6.

The transport pipeline 5 is mainly composed of a cylindrical transport pipe.
This transport pipe is arranged vertically or inclined,
The cross-sectional shape is circular or rectangular.

A transfer tube with a circular cross section is excellent in uniformity of pressing force,
On the other hand, a transport pipe having a rectangular cross section is slightly inferior in pressure uniformity as compared with a transport pipe having a circular cross section, but is excellent in manufacturability and cleanability.

Furthermore, in order to transport the screen residue after dehydration more smoothly, a low-friction material, for example, a high-density polyethylene thin film can be attached to the inner surface of the transport cylinder, or a fluororesin processing can be performed.

A chute 7 is provided at the upper end of the required length of the transfer pipe 5, and the dewatered screen residue conveyed so as to be pushed up in the pipe 5 slides down the chute 7 from the upper end of the pipe. I do. At the lower end of the chute 7, a bag 8 of a required size is installed, so that the screen residue is naturally stored in the bag 8.

In this case, the amount of the screen residue packed in the bag 8 is
It shall be determined by weight.

Thus, when the amount of the screen residue packed in the bag 8 reaches a predetermined weight, the bag filling is stopped, the mouth of the bag 8 is fastened, and the bag 8 is replaced with a new bag.

For the detection of the bagging amount, the table 9a supporting the bags 8 is configured as a weighing device.

Further, by arranging a plurality of tables 9a for supporting the bags 8 on the turntable 9, it is possible to quickly exchange the bags 8 filled with the screen residue and carry out the bags 8 filled with the screen residues. Thus, the dewatering of the screen residue by the pressurized dewatering device 2 can be performed stably without stopping.

〔The invention's effect〕

According to the method for dewatering screen residue of the present invention, the screen residue depressurized and dehydrated in the pressure dehydrator is placed on a turntable via a chute in a conveying pipe connected to the pressure dehydrator. In addition, by directly bagging while weighing, the bag filled with the screen residue can be exchanged and the bag filled with the screen residue can be quickly carried out, and the dewatering process of the screen residue by the pressure dewatering device is stopped. The screen residue can be handled stably without any trouble, and the screen residue can be easily handled, and the screen residue can be easily transported or dumped to an incineration plant or the like while preventing scattering of odor.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing one embodiment of a method for dehydrating a screen residue according to the present invention. 1 is a hopper, 2 is a pressure dehydrator, 3 is a hydraulic cylinder,
3a is a piston, 4 is a back pressure plate, 5 is a conveying pipeline, 6 is a hydraulic cylinder for back pressure, 7 is a chute, 8 is a bag, 9 is a turntable, and 9a is a table.

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Toshiaki Tsuda 3-1-1, Shimosakabe, Amagasaki-shi, Hyogo Nippon Kidenki Kogyo Co., Ltd. (56) References JP-A-59-229299 (JP, A) JP-A-60-82299 (JP, A) JP-A-50-9275 (JP, A) JP-A-61-67598 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) C02F 11 / 00-11/20 B30B 9/20

Claims (1)

(57) [Claims] 1. A screen residue depressurized and dehydrated in a pressure dehydrator is directly packed in a bag disposed on a turntable via a chute in a conveying pipe connected to the pressure dehydrator while being measured. A method of dehydrating a screen residue.