JPH0473282A - Method for recycling paper - Google Patents

Abstract

PURPOSE:To efficiently carry out reclamation of paper by charging waste paper produced in a building into pulper to give slurry, then transporting the slurry to a waste paper treating plant and returning water already used in the plant to the pulper. CONSTITUTION:Pulpers B1 to B5 are each installed in buildings A1 to A5 and waste paper such as output paper of word processor or computer produced at offices in these buildings is charged into the above-mentioned pulpers and defibrated into slurry having prescribed concentration. Then the resultant slurry is directly transported through a slurry transportation pipe line C1 to a waste paper treating plant D and further water already used obtained in a dehydrating process of the waste paper treating plant is returned to the above-mentioned pulper by an already used water transportation pipe line C2 to efficiently carry out recovery and reutilization of waste paper almost disposed without utilizing.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for recycling paper, particularly for recycling OA (office automation) paper such as word processor or computer output paper and copy paper discharged from buildings. This paper relates to various paper waste recycling methods.

[Prior Art] Conventionally, paper waste discharged from offices in buildings is roughly divided into groups such as newspapers, magazines, corrugated paper, and OA paper. As a method for disposing of paper waste, newspapers, magazines, and cardboard are manually collected by collection companies and transported to paper mills by transportation means such as trucks as raw materials for recycled paper. On the other hand, as there is no collection and reuse system for OA paper, in most cases, it is transported by truck to a disposal facility such as an incinerator or a landfill after paying the transportation and disposal fee. Common.

[Problems to be Solved by the Invention] However, transporting by truck requires manpower (or labor costs), resulting in high costs. In large cities, the large number of trucks engaged in transporting paper waste causes traffic congestion on roads surrounding waste disposal facilities.

Furthermore, information written or printed on OA paper often requires confidentiality. However, the disposal method of discarding by transporting by truck is insufficient in terms of confidentiality.

Furthermore, paper manufacturing requires a large amount of water (not seawater) for recycling, so the location requirements for paper waste treatment plants are limited to locations near rivers or where abundant groundwater is available. was also a problem.

The present invention was proposed in view of the problems of the conventional processing methods described above, and it solves the problems of the collection method using trucks, which requires labor and requires the use of roads, and it also solves the problems of the collection method using trucks, which is labor-intensive and requires the use of roads. The purpose of the present invention is to provide an efficient paper recycling method that can solve the problem of recovering unused OA paper.

[Means for Solving the Problems] The paper recycling method according to the present invention includes installing a pulper in a building, feeding paper waste generated in the building into the pulper, dissolving it into a slurry of a predetermined concentration, and dissolving the paper waste into a slurry of a predetermined concentration. The slurry is transported to a paper waste processing plant through a slurry transport pipe, and the used water produced in the dewatering process of the paper waste processing plant is returned to the pulper through the used water transport pipe.

Here, the term "paper waste processing factory" includes recycled paper factories, used paper pulp manufacturing factories, etc.

In implementing the present invention, the above-mentioned building is each building in a group of buildings, and the slurry transport pipe and the used water transport pipe are connected to the pulper of each building and the inside of the building group (for example, underground).
Alternatively, it is preferable to connect it to a paper waste processing factory located nearby.

Here, the pulper of each building and the paper waste processing plant can be connected through a common slurry transport pipe and a used water transport pipe.

In this case, the common slurry transport pipe and the used water transport pipe are preferably arranged in a common ditch.

Also, it is preferable to install one pulper in a building,
A small pulper or disposer may be provided on each floor, the slurry from the disposer may be accumulated in a slurry accumulation tank provided in each building, and the slurry accumulation tank may be connected to the slurry transport pipe. .

In addition, the water (service water) supplied to the pulper during dissolution and separation in the pulper is the so-called "gray water" of the building, and when it is recycled as used water, fresh water is used in the dewatering machine of the paper waste processing factory. Preferably, it is replenished.

Additionally, on each floor of the building where the method of the present invention is implemented,
It is preferable to provide a waste bin exclusively for paper waste. In order to make it extremely easy to separate and process paper waste, improve paper recycling efficiency, and obtain a variety of recycled paper, we have installed multiple waste disposal boxes and subsequent processing systems, each with its own separate processing system. It is preferable that the system is configured to handle only specific types of paper waste.

[Function] According to the paper recycling method according to the present invention, the paper waste thrown into the waste disposal box on each floor is processed into a slurry of a predetermined concentration in a pulper. The slurry is
The slurry is transported directly to a paper waste processing plant via a slurry transport pipe and recycled into recycled paper. Therefore, there is no need to transport it by road using a truck or the like. When recycled paper is made, the used water obtained from the dehydrator is returned to the pulper together with make-up water and reused.

As a result, there is no need to transport the paper waste by road by truck or the like, so the cost of transport becomes unnecessary. In addition, trucks for transporting paper waste will no longer cause traffic congestion.

Furthermore, in the present invention, paper waste is turned into recycled paper through a closed system, so even if a document contains confidential information, the confidential content will not be leaked to the outside during the recycling process. Therefore, the present invention is suitable also from the viewpoint of confidentiality.

In addition, water consumption is saved because the used water is recycled back to the pulper as used water and reused. As a result, less water is required for paper recycling.
Location requirements for paper recycling factories will also be relaxed.

[Example] The present invention will be described in detail below with reference to the drawings.

FIG. 1 shows a basic conceptual diagram of an apparatus implementing the present invention. In Figure 1, buildings A1 to A5 (hereinafter referred to generically as A) each have a pulper 8
1 to B5 (hereinafter, the reference numeral B is used when collectively referring to them). Each of the pulpers B1 to B5 is connected to a paper waste processing plant via a slurry transport pipe C1 and a used water transport pipe C2, respectively.

In Figures 2 and 3, building A is equipped with a vertical shaft (vertical empty room) 1 extending from the top floor to the basement, an exhaust port 2 is provided at the top of this shaft 1, and an exhaust chute is provided at the bottom. 13 are provided.

An upper sprocket 4 driven by a drive motor 3 is provided at the top of the shaft 1, and a lower sprocket 5 is provided at the bottom. Then, a conveyor chain 6 equipped with a plurality of garbage conveying trays 7 is connected to both sprockets 4.
It is wound around 5.

Further, a trash box 8 that can be opened and closed is provided on each floor, and the trash box 8 includes a trash stopper 9, a stopper release electromagnetic switch 10, a tray detection arm 11, a trash detection arm 12, and the like.

A hopper 14 is provided below the discharge chute 13, and the hopper 14 is provided with a shutter 15 that automatically drops and supplies the paper waste E to the pulper B below.

Here, for example, a 20-inch pipe is used as the slurry transport pipe C1, and this slurry transport pipe C1 connects the bottom of the pulper B and the cleaner 20 (FIG. 4) in the paper waste processing plant. A pump 17 is provided in the middle. On the other hand, the used water transport pipe C2 is, for example, a 5-inch pipe, and the used water transport pipe C2 is connected to the upper part of the pulper B and the thickener 23 (Fig. 4) in the paper waste processing plant, or to the paper manufacturing plant. A drain pipe from the device 24 is connected, and a pump 18 is provided in the middle.

The pulper B is provided with a stirring member 16 such as a rotor, blades, blade plates, and a strainer. Furthermore, pulper B is supplied with gray water from building A through conduit C3.

In Fig. 4, a cleaner 20,
Paper manufacturing equipment 2, such as a refiner or beater 21, a screen 22, a thickener or dehydrator 23, and a paper machine
4 are arranged in series.

Further, the thickener 23 is supplied with fresh water through a pipe C4, and the paper manufacturing device 24 is supplied with virgin pulp through a pipe C5.

The water dehydrated in the thickener 23 is returned to the pulper B via the used water transport pipe C2 as described above, but the water that overflows without being returned is sent to the coagulation flotation tank 30 through the pipe C6.

The supernatant water of the flotation tank 30 is passed through the pipe C7 with reference numeral 3 as a whole.
A portion of the sludge is sent to a catalytic oxidation treatment facility indicated by 1, and a portion is discharged through a pipe C8, and a portion is discharged as a sludge along with a precipitate through a pipe C9. The supernatant water treated by the equipment 31 is then discharged as waste water or together with sludge.

When paper waste E consisting of used paper, for example office paper such as used computer output paper or copy paper, is thrown into the waste disposal box 8 on each floor, the waste E is sent downward by the waste conveyance tray 7 of the chain conveyor 6. , is put into the hopper 14. The garbage E in the hopper 14 is at the shutter 15.
It is automatically weighed and a certain amount is put into pulper B.

Gray water supplied from the pipe C3 and used water returned via the pipe C2 are added to the pulper, and the waste E is treated to be difficult to dissolve by the stirring member 16 to form a slurry of a predetermined concentration. Then, the slurry is pumped to a paper waste processing plant by a pump 17 via a slurry transport pipe C1.

At the paper waste processing plant, slurry is processed using cleaner 20,
A predetermined treatment is performed while passing through a refiner 21 and a screen 22, and water is dehydrated in a thickener 23. The fibers obtained by dehydrating with the thickener 23 are used in paper manufacturing equipment @2
4, virgin pulp is added to the paper manufacturing device 24, and the paper is recycled into recycled paper. In another case, the fibrous material obtained by dewatering with Thickener 23 is used as waste paper pulp, so the process is completed at this stage and transported to a separate paper waste processing factory, where it is recycled into paper. In some cases.

On the other hand, the used water dehydrated in the thickener 23 is
The used water is returned to the pulper B through the used water transport pipe C2 by the pump 18 together with the fresh water supplied through the pump 4. The used water overflowing from the thickener 23 is treated in a coagulation flotation tank 30 and a catalytic oxidation treatment facility 31, and is discharged as waste water or together with sludge.

Here, if various types of waste paper are slurried and recycled in a mixed state, only the recycled paper corresponding to the lowest quality of the mixed waste paper can be obtained. Therefore, waste paper is separated by paper quality, and a garbage disposal box 8 in which only a single type of waste paper is disposed of, and a processing system that processes only that type of waste paper are installed. Preferably, another recycled paper is obtained.

Specifically, the building A and the paper waste processing factory will be connected by a plurality of slurry transport pipes C1, which are provided for each type of paper. However, since it is not necessary to separate the used water by paper type, it is sufficient to provide only one used water transport pipe C2 as in FIG. 1.

FIG. 5 shows the basic concept of another example of a device for carrying out the invention. In the case of the apparatus shown in FIG. 1, each building and the paper waste processing plant are connected by individual slurry transport pipes C1 and used water transport pipes C2. On the other hand, in FIG. 5, each pulper B1 to B6 in each building is connected to a common slurry transport pipe CIA and a used water transport pipe C2A, and the pulpers B1 to B6 of each building are connected to a common slurry transport pipe CIA and a used water transport pipe C2A. It is connected to a waste treatment plant.

FIGS. 6 and 7 show still another apparatus for implementing the present invention, in which an in-shaft slurry transport pipe C1a is installed in a shaft 1 of a building A, and an in-shaft used slurry transport pipe C1a is connected to a used water transport pipe C2. A water transport pipe C2a is provided, and a small piper, ie, a disposer BA, is provided adjacent to the garbage disposal box 8 on each floor.

The disposer BA has a used transport pipe C inside the shaft.
Used water is supplied from 2a, and gray water is supplied via pipe C3a. Then, the bottom of the disposer BA is connected to the in-shaft slurry transport pipe C1a, and the in-shaft slurry transport pipe C1a is connected to the slurry accumulation layer 19, and the slurry accumulated there is sent to the paper waste processing factory via the slurry transport pipe C1. It is sent to.

[Effect of the invention] The effects of the present invention are listed below.

(1) By simply throwing the paper waste generated in the building into the waste bins on each floor, it will be automatically turned into slurry and sent to the paper waste processing plant.

Therefore, it is possible to carry out the collection work, which is said to be 3K (unsightly, difficult, and uncool) and which people dislike, without requiring human power.

(2) Since no means of transportation such as trucks are used, there is no negative impact on road traffic problems in large cities, and there is no pollution problem such as paper waste scattered on the roads unlike with conventional methods.

(3) Paper waste can be recycled by sorting it by type, and paper can be recycled in a detailed and efficient manner.

(4) Paper waste is dissolved into slurry using a pulper before being transported directly to a paper waste processing plant, so there is no risk of leaking confidential documents and transportation efficiency is high.

(5) One round trip between the pulper and the paper waste processing plant (
Since the system is connected with a total of two transport pipes to form a closed cycle, it is possible to eliminate water waste and save energy while collecting and recycling paper waste. (6) Since the building's gray water can be used, it is possible to reduce costs and save labor, as well as save water resources.

(7) O was almost never used and was discarded.
A: It makes it possible to efficiently collect and reuse waste paper, thereby contributing to resource conservation and waste reduction.

[Brief explanation of the drawing]

Fig. 1 is a basic conceptual diagram showing an example of an apparatus for implementing the present invention, Fig. 2 is a side sectional view of a building, Fig. 3 is a side sectional view showing the pulper and shaft surroundings in Fig. 2, and Fig. 4 is A block diagram illustrating a paper waste processing factory, FIG. 5 is a basic conceptual diagram showing another example of a device implementing the present invention, and FIG. 6 is a side view of a building showing yet another example of a device implementing the present invention. 7 is a side sectional view showing the area around the disposer. A... Building B... Pulper BA... Disposer C1... Slurry transport pipe C1a.
... Slurry transport pipe in the shaft C2 ... Used water transport pipe C2a ... Used water transport pipe in the shaft D.
...Paper waste processing plant E...Paper waste diagram Figure 6

Claims (1)

[Claims] A pulper is installed in a building, paper waste generated in the building is fed into the pulper, dissolved and separated into a slurry of a predetermined concentration, and the slurry is transported to a paper waste processing factory through a slurry transport pipe, A method for recycling paper, characterized in that the used water produced in the dewatering process is returned to the pulper through a used water transport pipe.