JP2011226021A - Deinking apparatus and waste paper recycling apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a deinking apparatus which can treat a deinking drainage generated during the deinking process in the deinking apparatus and to provide a waste paper recycling apparatus.SOLUTION: An deinking apparatus includes: a deinking tank 46 in which air bubbles are supplied from an air bubble supplying unit 26 into a waste paper pulp liquid obtained by disintegrating of a waste paper, thereby the waste paper pulp is deinked; an overflow tank 48 for receiving the air bubbles overflowing from the deinking tank 46; and a drainage treatment unit 49 for performing the treatment of deinking drainage produced by extinction of the air bubbles contained in the overflow tank 48. The drainage treatment unit 49 includes: a coagulant adding unit 93 for adding a coagulant to the deinking drainage; a precipitation tank 59 for storing the deinking drainage to which the coagulant is added by the coagulant adding unit 93 and making flocculated materials precipitate; and an external drain flow passage 54 for draining supernatant liquid in the precipitation tank 59 to the outside.

Description

  The present invention relates to a deinking apparatus and a used paper recycling apparatus.

2. Description of the Related Art Conventionally, there is known a used paper recycling apparatus for producing recycled paper by deinking used paper pulp obtained by disaggregating used paper and making paper from the used paper pulp liquid after deinking. In the deinking process, printing components such as ink components and toner components are separated and removed from the liquid containing the used paper pulp, and the deinked waste liquid generated by the separation contains the used paper pulp together with the printing components and the like. .

If it is attempted to discharge the deinking waste liquid containing waste paper pulp to the outside, there is a risk of clogging the piping. In addition, when a large amount of waste paper pulp is contained, the waste water standard regarding SS (floating matter) is not satisfied, and it is necessary to separate and remove this waste paper pulp.

The following Patent Document 1 discloses a method for separating and recovering waste paper pulp, dewatering waste paper raw materials made of waste paper having a whiteness of 60% or more to obtain a pulp slurry, and dewatering filtrate obtained by dehydrating the obtained pulp slurry. Is disclosed on a technique for separating and recovering used paper pulp and ash mixed in the dehydrated filtrate, and adding the recovered used paper pulp and ash to the pulp slurry before the deinking step. is there.

This method is installed in a corner of a paper mill and is performed using a large apparatus for separating and collecting waste paper pulp from deinking waste liquid. After separating the waste paper pulp, the waste liquid containing a large amount of printing components such as an ink component and a toner component is treated in a very large water treatment apparatus provided separately to remove the printing components.

JP 2006-183210 A

However, such a large-scale water treatment apparatus recycles used paper in places where old paper occurs, such as residential areas where used paper such as used newspapers is generated, and offices where used paper such as paper on which confidential information is printed is generated. Therefore, it is not practical to use it for a small waste paper recycling apparatus. There has been a demand for a deinking device capable of improving the water quality in the deinking device from the deinking waste liquid generated in the deinking process.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-described problems and to provide a deinking device and a used paper recycling processing device capable of processing the deinking liquid discharged in the deinking process in the deinking device.

  In order to achieve the above object, a deinking apparatus according to claim 1 is provided with a deinking tank that performs deinking by supplying bubbles from a bubble supply unit into a used paper pulp liquid obtained by disaggregating used paper. An overflow tank that catches bubbles overflowing from the ink tank and a drainage processing part that performs processing of deinking drainage generated by the disappearance of the bubbles contained in the overflow tank are provided. Add the flocculant addition section to add the flocculant to the black ink drainage, store the deinking drainage liquid to which the flocculant has been added from the flocculant addition section, settle the aggregate, and the supernatant liquid in the precipitation tank An external discharge channel for discharging to the outside is provided.

According to a second aspect of the present invention, in the deinking apparatus according to the first aspect, the drainage treatment unit includes a removal unit that removes aggregates precipitated in the settling tank.

According to a third aspect of the present invention, in the deinking apparatus according to the second aspect, the drainage processing unit includes a drainage tank that stores the deinking drainage taken out from the overflow tank, and a drainage tank. And a pump for sending the stored deinking drainage liquid to the settling tank.

  Furthermore, the invention according to claim 4 is the deinking apparatus according to claim 3, wherein the deinking apparatus is provided with an external discharge channel for discharging the supernatant liquid in the settling tank to the outside, and stored in the drainage tank. The drainage tank includes a water level detection means for detecting that the drainage water level has reached a predetermined water level, and a control unit for controlling the operation of each part. When it is detected that the water level of the deinking drainage liquid stored in the tank has reached the predetermined level, the pump is driven and the deinking drainage liquid stored in the draining tank is sent to the settling tank. It is configured to control so that the supernatant liquid of the deinking waste liquid obtained by aggregating the liquid floating matter is discharged to the outside through the external discharge flow path.

Furthermore, the invention described in claim 5 includes the deinking apparatus according to any one of claims 1 to 4 and a papermaking apparatus for papermaking waste paper pulp liquid deinked by the deinking apparatus. The present invention relates to an integrated waste paper recycling apparatus.

The deinking apparatus according to claim 1, wherein the drainage processing unit stores a flocculant addition unit that adds a flocculant to the deinking drainage, and a deinking drainage liquid to which the flocculant is added from the flocculant addition unit. It has a sedimentation tank for precipitating agglomerates and an external discharge channel for discharging the supernatant liquid in the precipitation tank to the outside, so that the suspended solids are aggregated and precipitated by adding a flocculant, and the supernatant liquid in the precipitation tank Is discharged to the outside of the deinking device through the external discharge channel. Therefore, it is possible to easily process the deinking liquid discharged in the deinking process.

  According to the second aspect of the present invention, since the drainage treatment unit includes the removal unit that removes the aggregates precipitated in the sedimentation tank, the removal unit can easily remove suspended substances contained in the deinking drainage. Can be removed.

According to the third aspect of the present invention, the drainage processing unit has a drainage tank for storing the deinking drainage taken out from the overflow tank, and a deinking drainage stored in the draining tank for the precipitation tank. And a pump to be sent to the deinking tank overflowing from the deinking tank and being continuously taken out from the overflow tank can be temporarily stored in the draining tank, The stationary for precipitation can be performed efficiently.

  Furthermore, according to the invention described in claim 4, the control unit drives the pump when the water level detection means detects that the water level of the deinking drainage liquid stored in the drainage tank has reached a predetermined water level. Then, the deinking waste liquid stored in the draining tank is sent to the settling tank, and the supernatant of the deinking drainage liquid obtained by aggregating the deinking waste liquid in the settling tank is discharged to the outside through the external discharge channel. Therefore, the deinking drainage process can be performed very efficiently.

Furthermore, according to invention of Claim 5, the deinking apparatus as described in any one of Claims 1 thru | or 4 and the papermaking apparatus which makes the papermaking pulp liquid deinked by the deinking apparatus Therefore, it is possible to easily improve the water quality of the deinking liquid discharged during the used paper recycling process.

1 is a schematic configuration diagram of a used paper recycling processing apparatus according to an embodiment of the present invention. It is the schematic which shows the internal structure of the used paper pulp liquid manufacturing part of the said used paper reproduction | regeneration processing apparatus. It is a perspective view of the deinking device of the used paper recycling apparatus. It is the top view of the said deinking apparatus, and its partial sectional view. FIG. 3 is a schematic configuration diagram of a drainage processing unit of the deinking apparatus. It is the schematic of the sedimentation tank of the said drainage process part. It is the structure schematic of the paper making part of the said used paper reproduction | regeneration processing apparatus. It is the structure schematic of the drainage process part of the deinking apparatus of the used paper reproduction | regeneration processing apparatus which concerns on other embodiment of this invention.

(First embodiment)
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic configuration diagram of a used paper recycling apparatus according to the present invention. In FIG. 1, a used paper recycling apparatus 100 includes a used paper pulp manufacturing unit 1, a deinking pulp unit 2, a paper making unit 3, and a finishing unit 4 integrally in a casing (not shown), and further controls each unit. Part 8.

The used paper pulp manufacturing unit 1 separates the used paper 6 to produce used paper pulp, and the deinking pulp unit 2 deinks the used paper pulp manufactured in the used paper pulp manufacturing unit 1, and the paper making unit. 3 is used to make the deinked pulp obtained in the deinking pulp section 2, and the finishing section 4 is finished by cutting the recycled paper before finishing which is made in the paper making section 3. Paper 7 is obtained.

(Recycled Paper Pulp Production Department)
FIG. 2 is a schematic view showing the internal structure of the used paper pulp manufacturing unit 1. The used paper pulp manufacturing unit 1 includes a pulper 18 that is used to remove uncut used paper 6 or a piece of used paper 6 (not shown) after cutting by a cutting device such as a shredder, and water and a disaggregation accelerator liquid. Inside, it disaggregates to fibers, that is, waste paper pulp.

The pulper 18 is provided with a stirring tank 181 into which used paper 6 is charged, a water supply unit 182 for supplying water to the stirring tank 181, and a disaggregation accelerator supply unit 183. As the disaggregation accelerator for promoting disaggregation of the waste paper 6 supplied from the disaggregation accelerator supply unit 183, sodium hydroxide, sodium carbonate, etc. can be used, and sulfamic acid, hydrochloric acid, sulfuric acid, phosphoric acid, aluminum sulfate can be used. Acids such as sodium chlorite, sodium hypochlorite, sodium chlorite, hydrogen peroxide and other oxidizing agents, surfactants, bleaching agents, PH stabilizers, chelating agents, dispersing agents, and the like can also be used supplementarily.

An agitation blade 184 for agitating and separating the waste paper 6 together with water supplied from the water supply unit 182 is provided at the inner bottom of the agitation tank 181, and driving means 188 such as a motor for rotating the agitation blade 184 is provided. is doing. Moreover, the used paper pulp liquid extraction part 187 for taking out the obtained used paper pulp liquid is provided.

(Deinking pulp section)
As shown in FIG. 1, the deinking pulp unit 2 includes a pre-deinking dilution unit 21 and a deinking processing unit 22, and a transfer unit (not shown) including a pipe, a pump, and the like is provided between the units. .

  The pre-deinking diluting section 21 is a fiber concentration suitable for deinking the waste paper pulp liquid sent from the pulper 18, here about 0.1 wt% to 5.0 wt%, more preferably 0.3 wt% to The liquid is diluted to about 2.0% by weight, and is provided with a diluting liquid supply unit (not shown) for supplying diluting water, a surfactant as a deinking agent, and the like. By setting the fiber concentration to 0.1 wt% to 5.0 wt% in the pre-deinking dilution unit 21, the toner component and the deinking agent are efficiently brought into contact with each other in the subsequent deinking processing unit 22. It can be easily removed.

 3 is a perspective view of the deinking device D constituting the deinking processing unit 22, FIG. 4A is a plan view of the deinking device D, and FIG. 4B is an AA view of FIG. 4A. A cross-sectional view taken along line arrow is shown. The deinking device D is for producing a deinked pulp by separating printing components such as an ink component and a toner component dissolved or mixed in the waste paper pulp liquid. 47, an overflow tank 48, and a drainage treatment part 49. In FIG. 4B, the drainage processing unit 49 is omitted.

The deinking tank 46 circulates waste paper pulp liquid containing printing components such as an ink component and a toner component adjusted to a predetermined concentration by supplying a diluent in the pre-deinking diluting unit 21 to perform deinking. . The interior of the deinking tank 46 is partitioned into a plurality of deinking chambers 25 by a plurality of partition walls 23, and as shown in the plan view of FIG. All the deinking chambers 25 communicate with each other by opening. As shown in FIG. 4 (b), at the bottom of each deinking chamber 25, a bubble supply unit 26 is provided for supplying fine bubbles into the waste paper pulp liquid flowing through the deinking tank 46. .

Further, in the deinking tank 46, an agitating blade (not shown) for agitating and flowing the used paper pulp liquid stagnated at a predetermined position where the flow rate of the used paper pulp liquid decreases and the used paper pulp liquid stagnates to the downstream side. Is arranged. There are various types of stirring blades, and examples include a stirring blade having a structure in which a plurality of blades are arranged radially around the rotation axis. Furthermore, an inflow part 44 for allowing the waste paper pulp liquid to flow into the deinking tank 46 and an inflow part 45 for allowing the deinking pulp liquid containing deinked pulp generated after the deinking process to flow out of the deinking tank 46 are provided. ing.

Further, although the temperature sensor 27 for detecting the temperature of the used paper pulp liquid in each deinking chamber 25 and the heater 28 are provided on the front and back surfaces of the partition wall 23, the temperature management of the used paper pulp liquid is not performed. However, the temperature sensor 27 and the heater 28 may be omitted.

The bubble sweeping means 47 is for sweeping bubbles floating above the deinking tank 46 to overflow the peripheral wall of the deinking tank 46 toward the overflow tank 48, and is provided above the deinking tank 46. The blade 47c is configured to reciprocate while being guided by the guide rail 47b by driving the motor 47a.

As shown in FIG. 4 (a), the overflow tank 48 is provided in a square shape in plan view so as to surround the outer periphery of the deinking tank 46, and the bubbles supplied from the bubble supply unit 26 into the waste paper pulp liquid are deinked. The air bubbles are received when overflowing from the tank 46. As shown in FIGS. 3 and 4 (b), the overflow tank 48 is a liquid for washing away the bubbles adhering to the inner wall surface of the overflow tank 48, defoaming, and washing the waste paper pulp adhering to the inner wall surface of the overflow tank 48. Supply means 38 is provided. The liquid supply means 38 is provided with a liquid supply pipe 36 provided over the entire circumference of the upper and middle stages of the inner wall surface of the overflow tank 48, and a plurality of liquid supply ports 35 are provided in the liquid supply pipe 36. It is formed at a predetermined interval.

The liquid supply pipe 36 is connected to a tap water supply unit (not shown) for supplying tap water, a white water tank 42 for storing white water, which will be described later, and a drainage processing unit 49, and these are controlled by the control unit 8. One of tap water, white water, and deinking drainage liquid is supplied from.

Furthermore, the overflow tank 48 may include a wind supply unit (not shown) or the like that eliminates bubbles by blowing hot air or hot air on the generated bubbles and blowing off moisture of the bubbles, if necessary.

At the bottom of the overflow tank 48, an extraction part 39 for taking out the liquid stored in the overflow tank 48 is provided. The liquid stored in the overflow tank 48 includes the liquid supplied from the liquid supply port 35, the liquid overflowing from the deinking tank 46 together with the bubbles, the printing components such as ink components and toner components, and the used paper. This is a deinking effluent mixed with pulp. A pipe 71 is connected to the extraction portion 39.

FIG. 5 shows a schematic configuration diagram of the drainage processing unit 49. The drainage processing unit 49 is for processing the deinking drainage liquid extracted from the extraction unit 39 of the overflow tank 48, and includes a drainage extraction channel 51, a drainage tank 58, a circulation channel 52, and a branch channel. 53, a sedimentation tank 59, an external discharge channel 54, and a sediment channel 55.

  The drainage discharge channel 51 is a channel for allowing the deinking drainage liquid taken out from the extraction unit 39 to flow into the drainage tank 58, and serves as a removal unit that removes the solid content in the deinking drainage at an intermediate position. A filtration unit 81 is provided. And it has the piping 71 which connects the extraction part 39 and the filtration part 81, and the piping 72 which connects the filtration part 81 and the drainage tank 58.

The filtration unit 81 includes a filter body 82 that filters solid content such as waste paper pulp contained in the deinking waste liquid. The filter body 82 is made of filter paper, activated carbon, metal mesh, synthetic resin mesh, felt, or the like, and may be configured to be detachably attached to a frame (not shown) or the like. A portion where the black ink drain is supplied and actually filtered may be configured to be sequentially movable so that continuous filtration can be performed. That is, for example, an endless mesh belt (not shown) that runs around is used as a filter body 82, and the deinking drainage is flowed onto the filter body 82 to perform filtration, and the mesh belt as the filter body 82 is run. The residue remaining on the filter body 82 may be squeezed by a squeezing roller provided on the downstream side in the traveling direction of the mesh belt, and sequentially removed from the filter body 82 with a scraper (not shown).

When the filter body 82 of the filter unit 81 is a metal or synthetic resin mesh, the mesh is rough enough to filter out used paper pulp and the like contained in the deinking waste liquid, that is, 10 mesh to 50 mesh. Is preferable, and 20 mesh to 40 mesh is more preferable. The amount of waste paper pulp that passes through the mesh without being separated because the mesh is finer than 10 mesh can be reduced, and the mesh that is coarser than 50 mesh is less likely to clog the mesh due to waste paper pulp, etc. Efficiency can be improved.

A defoaming agent adding section 83 is provided in the drainage outlet flow passage 51. The antifoaming agent adding unit 83 is provided in the middle of the pipe 72 extending from the filtering unit 81 to the drainage tank 58, and adds an antifoaming agent to the deinking drainage liquid taken out from the extraction unit 39. The installation position of the defoamer addition unit 83 is not limited to the drainage extraction flow path 51, and may be a midway position of the pipes 71, 73, 74 constituting the drainage tank 58 or the drainage processing unit 49. Further, a portion other than the drainage processing unit 49, that is, the inside of the overflow tank 48 or the liquid supply pipe 36 may be used. Of these, the antifoaming agent can be easily added, and the deinking drainage to which the antifoaming agent has been added can be easily stirred to dissolve and disperse the antifoaming agent in the deinking drainage. The inside of the tank 58 is preferable.

The drainage tank 58 is provided below the overflow tank 48 and stores the deinking drainage fluid that has flowed through the drainage extraction passage 51 by natural flow. A pipe 73 is connected to the bottom of the drainage tank 58. Further, water level detection means 84, 85, and 86 for detecting the water level of the deinking drainage liquid stored in the drainage tank 58 are provided at three positions of the high, middle, and low side walls in the drainage tank 58. .

The circulation flow path 52 sends the deinking drainage liquid in the drainage tank 58 to the liquid supply means 38, and a pump 88 is disposed at a midway position to connect the drainage tank 58 and the pump 88. 73, and a pipe 74 connecting the pump 88 and the liquid supply pipe 36.

The branch flow path 53 is formed by branching from a pipe 74 downstream of the installation position of the pump 88 in the circulation flow path 52, and has a pipe 75 that connects the pipe 74 and the sedimentation tank 59. An on-off valve 67 is provided at an intermediate position.

FIG. 6 shows an external view of the settling tank 59. As shown in the figure, the settling tank 59 includes a tank body 91, a stirring means 92, a flocculant addition unit 93, and a water level sensor 87. The tank body 91 has a cylindrical body and a lower part formed in a funnel shape. A pipe 75 is connected to the funnel-shaped portion of the lower part of the tank body 91 so that the deinking drainage fluid that has flowed from the circulation channel 52 into the branch channel 53 flows into the tank body 91. A pipe 76 is connected to the middle side wall of the tank body 91 so that the supernatant liquid in the settling tank 59 is taken out. Furthermore, a pipe 77 is connected to the lowermost end of the funnel-shaped portion of the tank body 91 so that the solid content precipitated in the lower part of the settling tank 59 is taken out together with the deinking drainage liquid stored in the tank body 91. Yes.

The agitation unit 92 agitates the deinking drainage liquid stored in the tank body 91, and transmits the agitation blade 95, a driving unit 96 such as a motor, and a belt and a pulley that transmit the driving of the driving unit 96. Means 97 is provided. The coagulant adding unit 93 supplies the coagulant to the tank main body 91 from the coagulant storage unit 98 for storing the coagulant for aggregating the floating substance contained in the deinking drainage, and the coagulant storage unit 98 And a piping 99 to be used. The water level sensor 87 is provided on the upper side wall of the tank body 91 and detects that the deinking drainage is stored up to the installation position of the water level sensor 87.

As a flocculant supplied from the flocculant addition part 93, various things can be used and both an organic type and an inorganic type can be used. In the organic system, any of nonionic, anionic and cationic can be used. Nonionic, such as polyacrylamide, polyethylene oxide, etc., anionic, sodium polyacrylate, sodium polymethacrylate, sodium alginate, carboxymethylcellulose In the case where the maleic acid copolymer is cationic, polydiallyldimethylammonium chloride, polyethyleneimine, polyallylamine, chitosan and the like can be used. In inorganic systems, aluminum sulfate, aluminum oxide, aluminum chloride, sulfate band, ammonium alum, potassium alum, polyaluminum chloride, polyaluminum sulfate, ferrous sulfate, ferric sulfate, ferric chloride, slaked lime, oxidation Magnesium, magnesium carbonate, etc. can be used.

Of these, inorganic flocculants are preferably used, and liquid flocculants are more preferable than powder flocculants. By using a liquid flocculant, a pump is used as means for adding the flocculant, and whether or not the flocculant is added can be adjusted by operating and stopping the pump. Thereby, the structure of the flocculant addition part 93 can be simplified. Further, in the same manner, the flocculant adding part 93 can be simplified in structure, and the flocculant that can be agglomerated by a single agent is more preferable than the combination of two agents.

The external discharge channel 54 is constituted by a pipe 76 connected to the side wall of the tank body 91 and an on-off valve 69 provided at a midway position of the pipe 76, and the supernatant liquid of the precipitation tank 59 is brought out of the deinking device D. It comes to discharge. The sediment passage 55 is constituted by a pipe 77 and an on-off valve 68 provided at a midway position of the pipe 77, and the solid matter precipitated in the precipitation tank 59 is taken out from the bottom of the precipitation tank 59 together with the deinking drainage liquid, and by its own weight. It is made to flow into the filtration part 81.

(Paper making)
FIG. 7 is a schematic perspective view of the paper making unit 3 and the finishing unit 4. The paper making unit 3 papers the deinked pulp liquid that has been deinked by the deinking pulp unit 2, and includes a head box 31, a wire unit 32, a press unit 33, and a dryer unit 34.

  The head box 31 has an opening at the top and a supply port 31a for deinked pulp liquid is formed at the bottom. Guide members 31b having a predetermined length are cantilevered along both width edges of the paper making wire 323 for making the deinked pulp liquid at both ends in the width direction of the deinked pulp liquid supply port 31a. The guide member 31b prevents the deinking pulp liquid supplied from the head box 31 onto the papermaking wire 323 from flowing outward from the side edge of the papermaking wire 323, and makes the papermaking width of the wet paper 64 a predetermined length. Set up and maintain.

The wire portion 32 is wound around a plurality of rotating rollers 321 and is provided with a papermaking wire 323 that forms an endless track. The inner portion of the circulating papermaking wire 323 receives water flowing down from the mesh of the papermaking wire 323. A water portion 325 is provided. The water receiving unit 325 is connected to the white water tank 42, and the white water tank 42 is connected to the pulper 18, the pre-deinking diluting unit 21, and the like, and is used for disaggregating used paper or diluting used paper pulp liquid. Further, the white water tank 42 is also connected to the liquid supply pipe 36 of the deinking processing unit 22 so that the white water in the white water tank 42 can be reused as at least one of a defoaming liquid and a cleaning liquid.

The press unit 33 has a pair of upper and lower endless water absorbing belts 332a and 332b each made of felt that is stretched between a plurality of rotating rollers 331. The upper water absorbing belt 332a and the lower water absorbing belt 332b are partly included. It is in contact. In a portion where the upper water-absorbing belt 332a and the lower water-absorbing belt 332b are partially in contact with each other, a plurality of a pair of squeezing rollers 334 are provided to squeeze and squeeze both the water-absorbing belts 332a and 332b.

The dryer unit 34 includes a plurality of rotating rollers 351 and a drying roller 343 disposed in a hood (not shown), and includes a pair of upper and lower conveying belts 342 spanned between the plurality of rotating rollers 351 and the drying roller 343. . The material of the conveyor belt 342 is not particularly limited. For example, cloth, heat-resistant resin, metal, or the like is used, and the upper and lower conveyor belts 342 run in a state where a part of the conveyor belts 342 is in contact. The drying roller 343 is arranged. The drying roller 343 includes a heater 345 inside, a winding belt 342 is wound around the outer peripheral surface, and a temperature sensor (not shown) that measures the temperature of the surface of the drying roller 343.

(Finishing part)
The finishing unit 4 includes a calendar unit 41 and a cutting unit (not shown). The calendar unit 41 includes a plurality of press rollers 411 for increasing the flatness of the paper, and the cutting unit converts the paper into a predetermined sheet size. And a cutting blade (not shown) for cutting.

(Control part)
The controller 8 controls the operation of the used paper recycling apparatus 100 as a whole, and for the drainage processing section 49 of the deinking apparatus D, the deinking drainage liquid stored in the drainage tank by the middle water level detection means 85. When it is detected that the water level has reached a predetermined water level, the pump 88 is driven to send the deinking drainage liquid stored in the drainage tank 58 to the settling tank 59, and the deinking drainage floating matter in the settling tank 59. Control is performed so that the supernatant of the deinking drainage liquid obtained by agglomeration treatment is discharged to the outside through the external discharge channel 54.

(Function)
The operation of the used paper recycling apparatus 100 according to this embodiment will be described below.
First, as shown in FIG. 2, a predetermined amount of used paper 6 whose weight has been measured in advance is put into a stirring tank 181. Further, water and a disaggregation accelerator having a weight corresponding to the weight of the used waste paper 6 are respectively introduced into the agitation tank 181 from the water supply unit 182 and the disaggregation accelerator supply unit 183.

And the drive means 188 is operated, the stirring blade 184 is rotated, and the used paper 6 is stirred with water and a disaggregation promoter in the stirring tank 181 to produce used paper pulp liquid. The manufactured waste paper pulp liquid is taken out from the waste paper pulp liquid take-out section 187 and sent to the deinking pulp section 2 as shown in FIG.

In the deinking pulp section 2, firstly, diluting water and a surfactant as a deinking agent are introduced from the diluting liquid supply section so that the used paper pulp liquid has a concentration of used paper pulp suitable for deinking in the pre-deinking diluting section 21. Then, the used paper pulp liquid is diluted. Next, the used paper pulp liquid adjusted to a predetermined used paper pulp concentration is sent to the deinking processing unit 22.

As shown in FIGS. 3 and 4, in the deinking processing section 22, the used paper pulp liquid that has flowed in from the inflow section 44 is sequentially circulated from the left or right opening of the partition wall 23 to the adjacent deinking chamber 25. In each deinking chamber 25, fine bubbles are blown from the bubble supply unit 26 into the waste paper pulp liquid, and hydrophobic foreign matters such as toner particles are formed on the surface of the bubbles generated in large quantities without disappearing due to the presence of the deinking agent. Is attached to the top of each deinking chamber 25. Further, if necessary, a stirring blade is operated so as to promote smooth circulation of the used paper pulp liquid in the deinking tank 46.

The hydrophilic fibers sequentially flow through the deinking chamber 25 together with water. In this way, deinking is performed to remove the ink component and the printing component of the toner component from the waste paper pulp liquid. At that time, if necessary, the temperature sensor 27 may detect the temperature of the used paper pulp liquid and the heater 28 may control the temperature so that the used paper pulp liquid is maintained at a predetermined temperature. It is not always necessary to perform temperature management.

After introducing the waste paper pulp liquid into the deinking processing unit 22, when a predetermined time elapses and the deinking process proceeds and a large amount of bubbles float above the deinking chambers 25, the bubbles are discharged from the peripheral wall of the deinking tank 46. Overflow. The air bubbles generated in a large amount are forcedly swept out to the overflow tank 48 by driving the motor 47a and guiding the guide rail 47b to reciprocate the blade 47c in the vertical direction in FIG. 4A.

Bubbles that overflow from the deinking tank 46 to the overflow tank 48 or are swept away by the bubble sweeping means 47 are washed away with the liquid supplied from the liquid supply port 35, defoamed, and used paper pulp adhering to the wall surface is removed. Wash away.

As the liquid supplied from the liquid supply port 35, as shown in FIG. 5, when deinking drainage liquid having a water level higher than the installation height of the lower water level detection means 86 is stored in the drainage tank 58, The deinking drainage liquid in the drainage tank 58 is used. Further, when the water level of the deinking drainage liquid in the drainage tank 58 is less than the installation height of the lower level water level detection means 86, the white water in the white water tank 42 is used. When the water level of the deinking drainage liquid in the drainage tank 58 does not satisfy the installation height of the lower level water level detection means 86 and the white water is not stored in the white water tank 42, the tap water from the tap water supply unit Use water.

When the bubbles overflow from the deinking tank 46 and the liquid is supplied from the liquid supply pipe 35, the deinking drainage liquid accumulates in the lower part of the overflow tank 48. The deinking drainage liquid accumulated in the overflow tank 48 contains at least the liquid supplied from the liquid supply port 35. In addition to this liquid, printing components such as water, deinking agents, ink components and toner components, In addition to air bubbles overflowing from the ink tank 46 and liquid generated by the disappearance of the air bubbles, solids such as waste paper pulp overflowed from the deinking tank 46 together with the air bubbles are included. This deinking drainage liquid is taken out from the takeout portion 39 and reaches the drainage discharge passage 51.

As shown in FIG. 5, the deinking drainage flowing through the drainage extraction flow path 51 in the drainage processing unit 49 flows through the pipe 71 by natural flow, flows into the filtering unit 81, and is filtered by the filter body 82. Then, if necessary, an antifoaming agent is added from the antifoaming agent adding section 83, and the natural anti-foaming agent circulates in the pipe 72 and is stored in the drainage tank 58. As a result of the filtration, the user replaces the entire filter body 82 when a predetermined amount of residue such as waste paper pulp remaining on the filter body 82 is accumulated. By the filtration process in the filtration unit 81, solid content such as waste paper pulp overflowed from the deinking tank 46 together with air bubbles can be separated from the deinking wastewater, and the water quality of the deinking wastewater can be improved.

When the filtration unit 81 is capable of continuous processing using a mesh belt, the deinked waste liquid is filtered with a traveling mesh belt, and the residue on the mesh belt is squeezed with a squeezing roller or the like, and a residue storage box It is once stored in (not shown) and discarded by the user when the dehydrated residue reaches a predetermined amount.

In the drainage tank 58, when the amount of deinking drainage flowing into the drainage tank 58 is increased and the lower water level detection means 86 detects the water level, the control unit 8 operates the pump 88, and the deinking drainage is performed. Are introduced into the pipes 73 and 74, and the circulation channel 52 is circulated to the liquid supply pipe 36. Prior to the operation of the pump 88, the control unit 8 closes the on-off valve 67 in advance, and the deinking drainage fluid that flows through the circulation passage 52 and flows into the liquid supply pipe 36 flows to the branch passage 53. Avoid inflow. The deinking effluent that has flowed into the liquid supply pipe 36 is supplied as a shower from the liquid supply port 35 into the overflow tank 48, and is used to eliminate bubbles in the overflow tank 48 and to clean the inside of the tank.

In this way, the deinked waste liquid in the overflow tank 48 is taken out from the take-out section 39, circulated in the drain processing section 49, sent to the liquid supply pipe 36, and used for defoaming and washing, thereby supplying tap water. In addition to reducing the amount of tap water from the water and white water from the white water tank 42 and saving water, the amount of deinking drainage can also be reduced.

That is, when the tap water from the tap water supply unit or the white water from the white water tank 42 is supplied to the liquid supply means 38 of the overflow tank 48, the tap water or the white water is printed in the overflow of the deinking tank 46. It becomes mixed with the liquid containing many components and can no longer be separated. Therefore, the tap water and white water used for the liquid used for defoaming and washing must be disposed of as deinked waste liquid. On the other hand, for example, when the white water in the white water tank 42 is sent to the pulper 18 and used when the used paper is disaggregated, or sent to the pre-deinking diluting unit 21 and used as a diluent, paper making with the paper making wire 323 is performed. Thus, it can be recovered again as white water, so that it can be used any number of times. Similarly, tap water is saved.

Further, when the antifoaming agent is added from the defoaming agent adding unit 83 to the deinking drainage, the deinking drainage supplied from the liquid supply port 35 contains the antifoaming agent. Air bubbles can be eliminated quickly. Therefore, the volume of bubbles to be accommodated in the overflow tank 48 can be reduced, so that the overflow tank 48 can be made small.

Due to the progress of the deinking process in the deinking tank 46, the amount of deinking drainage stored in the draining tank 58 gradually increases, and eventually the water level of the deinking drainage reaches the installation position of the middle water level detection means 85. Rises. Then, when the middle water level detection means 85 informs the control unit 8 that the water level in the deinking tank 58 has reached the installation position of the middle water level detection means 85, the control part 8 In addition to opening 67, the on-off valve 68 is closed, and a part of the deinking drainage flowing through the circulation flow path 52 is caused to flow into the branch flow path 53 and flow from the pipe 75 to the settling tank 59.

And until the water level sensor 87 provided at the upper part of the tank main body 91 detects that the settling tank 59 is filled with a predetermined amount of deinking drainage liquid, the on-off valve 67 is set for a predetermined time. When the water level sensor 87 detects that the deinking drainage liquid in the settling tank 59 is almost full, the open / close valve 67 is closed and then branched from the circulation path 52 for the deinking drainage liquid. The flow into the flow path 53 is temporarily stopped.

Even while a part of the deinking drainage is circulated from the circulation channel 52 to the branch channel 53 and flowing into the settling tank 59, the remaining deinking drainage flowing through the pipe 74 is supplied to the liquid supply. Since it flows into the pipe 35 and the bubbles in the overflow tank 48 are eliminated, there is no possibility that the bubbles in the overflow tank 48 overflow from the overflow tank 48 to the outside.

The water level sensor 87 detects that the settling tank 59 is filled with full deinking drainage liquid, and after closing the on-off valve 67, a predetermined amount of the coagulant is supplied from the coagulant adding unit 93. Then, the liquid stored in the precipitation tank 59 is stirred by the stirring means 92. As a result, the flocculant is dispersed in the liquid in the settling tank 59 and mixed with the floating substance contained in the deinking drainage liquid to aggregate the floating substance to form a floc. Thereafter, the stirring means 92 is stopped and left for a predetermined time, so that the floc generated in the lower portion of the settling tank 59 is precipitated.

After the flocs have settled, the supernatant liquid of the sedimentation tank 59 flows into the pipe 76 when the control unit 8 opens the on-off valve 69 and is discharged from the external discharge channel 54 to the outside of the used paper recycling apparatus 100. . Since the suspended solids are aggregated and precipitated in the settling tank 59, the supernatant liquid can be discharged to the outside without performing treatment for improving the water quality again.

Thereafter, the on-off valve 68 is opened, and a liquid containing a large amount of solids such as precipitated floc and fine waste paper pulp is taken out from the lower portion of the settling tank 59, circulated through the pipe 77, and flows into the filtration unit 81. In the filtration unit 81, flocs generated in the settling tank 59 and used paper pulp that has once passed through the filter body 82 are filtered by the filter body 82 to remove floating substances contained in the deinking drainage liquid. In this way, the floating part contained in the deinking drainage liquid can be easily removed by the filtering unit 81. The control unit 8 causes almost all the sediment deposited in the lower part of the sedimentation tank 59 to flow through the sediment flow path 55 and then closes the on-off valve 68.

The deinking drainage liquid filtered by the filtering unit 81 and flowing into the drainage tank 58 is mixed with the deinking drainage liquid taken out from the extraction unit 39 and again flows into the circulation channel 52 by the pump 88 in the same manner as described above. Then, it is sent to the liquid supply pipe 35 over a plurality of times, flows into the branch flow path 53 and is discharged to the outside.

When an emergency occurs and the high water level detection means 84 detects the water level, the control unit 8 closes the take-out unit 39 and temporarily stops the inflow of the deinked waste liquid into the drainage processing unit 49.

In the deinking processing unit 22 shown in FIGS. 3 and 4, the used paper pulp liquid that has circulated through all the deinking chambers 25 in the deinking tank 46 is deinked, so that the used paper after deinking has been removed from the printing components. The used paper pulp liquid containing the obtained deinked used paper pulp flows out from the outflow part 45 and is sent to the papermaking part 3.

In the paper making unit 3, the deinking pulp liquid containing deinked pulp after deinking is uniformly supplied to the guide member 31 b on the paper making wire 323 running from the head box 31 in the wire unit 32, and drained. Thus, the wet paper 64 which is a fiber layer containing a relatively large amount of moisture is formed. The water flowing down below the papermaking wire 323 is received by the water receiving unit 325 and sent from the water receiving unit 325 to the white water tank 42.

  When the wet paper 64 on the paper making wire 323 reaches the terminal end of the upper paper making wire 323, the wet paper 64 is transferred to the upper water absorbing belt 332a, and is sandwiched between the lower water absorbing belt 332b and pinched by the dewatering roller pair 334. Then, the moisture contained in the wet paper 64 is dehydrated.

The wet paper 64 dehydrated by the dewatering roller pair 334 is conveyed to the drying unit 34 and is nipped and conveyed between the pair of drying belts 342. Then, the wet paper 64 is dried by being conveyed to the plurality of drying rollers 343 heated by the heater 345 and maintained at a predetermined temperature via the drying belt 342, and the recycled paper before finishing is performed. Get 65.

The unfinished recycled paper 65 exiting the drying unit 34 is sent to the calendar unit 41 and passed between a plurality of press rollers 411 to improve flatness, and further cut into a predetermined size at the cut unit. Recycled paper 7 is completed.

As shown in FIG. 1, the end material of the recycled paper 65 before finishing which has become unnecessary as a result of being cut at the cut portion is returned to the pulper 18 and used again for the production of recycled paper.

(Second Embodiment)
FIG. 8 shows a schematic configuration diagram of the drainage processing section 49a of the deinking pulp section of the used paper recycling apparatus according to the second embodiment. In the first embodiment, as shown in FIG. 5, the external discharge channel 54 is constituted by a pipe 76 connected to the middle height side wall of the tank body 91, and the sediment channel 55 is formed in the tank body 91. The pipe 77 is connected to the lowermost end of the funnel-shaped portion, but in the second embodiment, instead of this, the pipe 76a constituting the external discharge passage 54a and the pipe constituting the sediment passage 55a. 77a is connected to a pipe 78 connected to the lowermost end of the funnel-shaped portion of the tank body 91a, and a three-way valve 69a is provided at this connecting portion.

When the deinking waste liquid is processed by the drainage processing unit 49a, the three-way valve 69a is closed, the settling tank 59a is filled with the deinking drainage, the flocculant is supplied to the deinking drainage, and the agitation is performed. Then, the floating substance is agglomerated and the formed floc is precipitated, and then the control unit opens the three-way valve 69a on the pipe 77a side and closes the pipe 76a side. Thereby, first, a liquid containing a large amount of solids precipitated in the precipitation tank 59a is taken out from the pipe 77a before the supernatant liquid. Thereafter, all the solid content flows through the pipe 77a and is sent to the filtration part 81a, so that only the supernatant liquid remains in the precipitation tank 59a. In this state, the three-way valve 69a is closed on the pipe 77a side, the pipe 76a side is opened, and the supernatant liquid is circulated in the pipe 76a and discharged to the outside.

Thereby, the piping 78 can be used also for taking out both the liquid containing the solid content from the precipitation tank 59a and the supernatant liquid, and the structure can be simplified and the apparatus can be downsized. Further, the amount of liquid containing solids that flows through the sediment flow path 55a and is sent to the filtration part 81a is made smaller than that in the drainage treatment part 49 according to the first embodiment, and the external discharge flow path 54a. As a result, the amount of liquid that can be discharged to the outside can be increased. Therefore, a quick drainage process is possible.

D Deinking apparatus S Paper making apparatus 46 Deinking tank 47 Overflow tank 49 Drainage processing part 54 External discharge flow path 58 Drainage tank 59 Precipitation tank 85 Water level detection means 88 Pump 93 Flocculant addition part 100 Used paper recycling processing apparatus

Claims (5)

A deinking tank that performs deinking by supplying bubbles from the bubble supply unit into the wastepaper pulp liquid obtained by disaggregating used paper;
An overflow tank that catches air bubbles overflowing from the deinking tank;
And a drainage processing unit for processing deinking drainage generated by the disappearance of bubbles contained in the overflow tank,
The drainage treatment unit includes a flocculant addition unit that adds a flocculant to the deinking drainage,
A settling tank for storing the deinking waste liquid to which the coagulant is added from the coagulant addition unit, and precipitating the aggregate;
A deinking device comprising an external discharge channel for discharging the supernatant liquid in the settling tank to the outside. The deinking apparatus according to claim 1, wherein the drainage processing unit includes a removing unit that removes aggregates precipitated in the settling tank. The drainage processing unit includes a drainage tank for storing deinking drainage liquid taken out from the overflow tank,
The deinking apparatus according to claim 2, further comprising: a pump that sends the deinking drainage liquid stored in the drainage tank to the precipitation tank. An external discharge flow path for discharging the supernatant liquid in the precipitation tank to the outside is provided.
The water level detection means for detecting that the water level of the deinking drainage liquid stored in the drainage tank has reached a predetermined water level is provided in the drainage tank,
Provided with a control unit that controls the operation of each unit,
When the control unit detects that the water level of the deinking drainage liquid stored in the drainage tank has reached a predetermined water level, the control unit drives the pump to store the deinking drainage liquid stored in the drainage tank. The deinking device according to claim 3, wherein the deinking waste liquid supernatant obtained by agglomerating the deinking waste liquid in the settling tank is discharged to the outside through the external discharge channel. A used paper recycling apparatus comprising the deinking apparatus according to any one of claims 1 to 4 and a papermaking apparatus for making a used paper pulp liquid deinked by the deinking apparatus.

Images