JP4843265B2 - Waste liquid recycling device - Google Patents

Description

  The present invention relates to an apparatus for reclaiming waste liquid discharged during cleaning of printing machine components to which ink adheres, such as a blanket cylinder of a printing machine, and in particular, charged ink pigment, insulating cleaning liquid, and conductive The present invention relates to a waste liquid regenerating apparatus for separating three components with a single device in a treatment tank in which three components of water are mixed.

Cleaning the blanket cylinder and impression cylinder of a printing press uses a petroleum-based cleaning liquid, resulting in waste liquid. Conventionally, the waste liquid has been discarded, but in recent years, a method of reprocessing the waste liquid and reusing the cleaning liquid has been attempted.
Various methods have been proposed for recycling the waste liquid, but since it can be regenerated with high efficiency, an electrostatic field is generated in the waste liquid containing the three components of the ink pigment, water, and cleaning liquid, and the ink pigment is removed. Attention has been focused on a method of using an electrostatic field in which electrophoresis is carried out in a waste liquid and water is electrostatically aggregated to separate an ink pigment, water and a cleaning liquid.
Generally, a waste liquid recycling apparatus has a positive electrode on the upper side and a negative electrode on the lower side of the waste liquid recycling treatment tank, and the waste liquid containing ink pigment, water, and cleaning liquid used in the printing press is disposed in the waste liquid recycling treatment tank. The waste liquid is treated with an electrostatic field by applying a voltage between the electrodes, the ink pigment is guided to the negative electrode, and the agglomerated water is allowed to settle at the bottom of the waste liquid treatment tank. Is removed as a supernatant, and the cleaning liquid is regenerated from the waste liquid.
Prior to the proposal of the present invention, the present applicant has proposed a highly practical waste liquid regenerating apparatus using an electrostatic field utilization method (for example, see Patent Document 1 or Patent Document 2).
Hereinafter, a conventional waste liquid recycling apparatus will be described with reference to FIGS.
Japanese Patent No. 3586630 Japanese Patent No. 3586656

FIG. 4 is a schematic cross-sectional view showing the basic configuration of the waste liquid recycling apparatus 4 using the electrostatic field utilization method according to the above proposal.
As shown in FIG. 4, a partition plate 62 is arranged in the vertical direction in the figure in the container treatment tank 61 of the waste liquid regenerating apparatus 4, and the partition plate 62 and the vertical wall 63 on one side of the treatment tank 61 are arranged. A supply port 64 for introducing the waste liquid 6 into the waste liquid regenerating apparatus 4 is provided in the upper part.
Further, a gap 65 is formed between the lower end portion of the partition plate 62 and the bottom portion of the processing tank 61 , and the electrode plate 67 is arranged in the horizontal direction between the partition plate 62 and the other vertical wall 66. It is installed in. In this waste liquid recycling apparatus 4, the layer of water 7 functions as a ground electrode.

A waste liquid regeneration method realized by the waste liquid regeneration apparatus 4 will be described. In the waste liquid 6 supplied to the treatment tank 61 , water 7, ink pigments 68, and petroleum-based cleaning liquid are mixed. A high voltage is applied to the electrode plate 67, and an electric field is generated between the electrode plate 67 and the water 7 using the electrode plate 67 as a positive electrode and the water 7 as a negative electrode. By the action of this electric field, electrophoresis of the ink pigment 68 and electrostatic aggregation of the water 7 in the waste liquid 6 start. More specifically, the water 69 in the waste liquid 6 is aggregated into the aggregated water 70 having a large particle diameter, and the aggregated water 70 and the ink pigment 68 are moved and separated separately.

By continuing the state in which the electric field is generated for a long time, the reaction in the electric field proceeds, the water 69 and the ink pigment 68 are completely separated in the waste liquid 6 , and the water 69 aggregates into a group and is treated by gravity. It settles at the bottom of the tank 61 and joins the water 7 layer. Further, the positively charged ink pigment 68 adheres to the surface (upper surface) of the ground electrode (water layer) which is the negative electrode. As a result, a cleaning liquid from which the water 7 and 70 and the ink pigment 68 have been removed (that is, a cleaning regeneration liquid) is obtained. And this washing | cleaning liquid is made into collection | recovery object.

Subsequently, a conventional waste liquid recycling apparatus using the principle described above will be described. FIG. 5 is a schematic cross-sectional view of a configuration example of a conventional waste liquid recycling apparatus.
As shown in FIG. 5, the present waste liquid recycling apparatus 5 supplies the waste liquid 6 to the waste liquid supply unit 71, and the plus electrode plate 67 and the water 7 include three components of ink pigment, water, and cleaning liquid between the electrodes. Then, an electrostatic field is generated in the waste liquid, the ink pigment is electrophoresed in the waste liquid, and water is electrostatically aggregated to separate the ink pigment, water, and the cleaning liquid, and the regenerated liquid 8 is recovered. Here, as the operation proceeds, the regenerated liquid increases, but this regenerated liquid 8 was automatically processed by the overflow method.

In the waste liquid regenerating apparatus as described above, the water 7 generated by electrostatic aggregation also increases. However, if the distance LD between the surfaces of the positive electrode 67 and the water 7 as the ground electrode is not a predetermined distance, normal electrostatic aggregation cannot be performed.
Therefore, in order to control the water level of the water 7, a water level gauge 72 is provided in the tank, and when the predetermined water level is exceeded, the valve 74 of the drain hole 73 is opened to drain the water, and the predetermined water level (interelectrode distance LD). ) Had to be secured.
However, since such control requires automation, a water level meter, an electromagnetic opening / closing valve and a control device are required only for drainage, resulting in an increase in device manufacturing cost. There is also a risk that troubles with the sensor and the control device may occur.

  The present invention has been made in view of such circumstances, and in a cleaning waste liquid recycling method and apparatus for a printing machine, proposes a simple apparatus configuration, realizes a reduction in production cost, and causes trouble. It is an object of the present invention to provide a difficult and safe waste liquid recycling apparatus.

In order to solve the above problems, the present invention provides the following means.
The waste liquid recycling apparatus of the present invention is a waste liquid recycling apparatus comprising: a processing tank for storing waste liquid containing water used in a printing press; and an electric field generating means for generating an electric field in the processing tank . A first partition wall for partitioning, a water storage tank that is one space partitioned by the first partition wall in the processing tank, a drain opening provided in the water storage tank, and a bottom surface of the processing tank and a first gap provided between the first partition wall and said field generating means, the water contained in the waste liquid, is electrostatically agglomerate at the bottom of the treatment tank, the gap, the were electrostatically agglomerated water, acts as a communicating unit that derives the water reservoir from the other space partitioned by the first partition wall of the processing bath, the drainage opening The water in the water storage tank is drained naturally to adjust the water level in the water storage tank to a predetermined water level. Characterized in that it functions as that the water level adjusting mechanism.
By making the water storage tank and the treatment tank communicate with each other, a balance mechanism using the specific gravity difference between the water and the waste liquid can be realized.

In the aspect described above, the predetermined level is preferably determined based on the specific gravity of the waste liquid to be processed.
In the above invention, the drain opening is a drain hole, the treatment tank has the bottom surface and a peripheral wall, the drain opening is provided on the peripheral wall, and the first partition wall is formed on the peripheral wall. It is desirable that the drain opening is provided so as to face the first inner wall surface provided with the drain opening.
Moreover, in the said invention, it is desirable that the said processing tank has the said bottom face and a surrounding wall, and the said water storage tank is provided with the drain pipe which has an upper opening equivalent to the said drain opening, and can expand-contract.
In the above invention, the regeneration liquid recovery hole provided in the peripheral wall forming the other space is opposed to the second inner wall surface provided with the regeneration liquid recovery hole of the peripheral wall, and the lower end And a second partition wall provided so that a gap is formed between the first partition wall and a lower end of the first partition wall and the bottom surface of the processing tank. A recovery / regeneration liquid storage unit; a positive electrode horizontally disposed between a lower end of the second partition wall and the second inner wall surface; and a negative electrode provided on the bottom surface of the processing tank. It is preferable that the electric field generating means includes the plus electrode and the minus electrode.

  According to the waste liquid regenerating apparatus and the waste liquid regenerating method according to the present invention, the water level meter, the electromagnetic open / close valve and the control device used in the conventional apparatus configuration are not required, and the apparatus can be easily manufactured with a simple apparatus configuration. Production costs can be greatly reduced. Moreover, the risk of trouble occurring due to the self-balancing method without using sensors or control devices can be drastically reduced.

DETAILED DESCRIPTION waste reproducing apparatus and waste reproducing method according to the present invention will be described with reference to FIGS.
Waste reproducing apparatus according to the present invention, there is provided a self-balancing water tank as the water reservoir to balance the specific gravity of the solvent and water waste treatment layer, in other words, the waste liquid reproduction process device configuration, the water 7 It is set as the structure provided with the water storage tank using the specific gravity difference of waste liquid (solvent) 6 . The self-balancing water tank is provided so as to be connected to the waste liquid treatment tank, and a method of automatically draining the increased amount of water generated during the treatment is adopted.
Here, in the case of the water level (h1) of the water 7 for the earth electrode, the water level (h2) of the solvent, the specific gravity of water (ρ1 = 1), and the specific gravity of the solvent (ρ2 = 0.7), a water tank for self-balancing The water level (h0) is defined by the following equation (1).
<Equation 1>
(H0 × ρ1) = (h1 × ρ1) + (h2 × ρ2)
Therefore, the water level (h0) of the self-balancing water tank is determined so that the water level (h1) of the ground electrode in the treatment layer is substantially constant, and the water increased from this water level (h0) is naturally drained from the drain hole. With this configuration, the water level (h1) of the ground electrode is substantially constant, and the distance (LD) between the electrode plate 6 and the ground electrode is always kept constant. The present invention provides a suitable waste liquid recycling apparatus and waste liquid recycling method based on this finding.

First Embodiment
First, a basic configuration and a regeneration method of the waste liquid regenerating apparatus according to the present invention will be described with reference to FIG. FIG. 1 is a schematic cross-sectional view showing a basic apparatus configuration as a first embodiment according to the present invention, FIG. 1 (a) is a water injection state, FIG. 1 (b) is a cleaning liquid supply state, and FIG. ) Shows the regeneration operation state.
As shown in FIG. 1, the waste liquid regenerating apparatus 1 includes a processing tank 11 having two openings (regenerated liquid recovery hole 12 and natural drain hole 13) on a peripheral wall, and two partition walls 14 inside the processing tank 11. , 15 are provided.

Here, the partition wall 14 faces the inner wall surface of the treatment tank 11 where the natural drain hole 13 is provided, and a gap 16 is formed between the lower end of the partition wall 14 and the bottom surface of the treatment tank 11. It is provided as follows. A space surrounded by the partition wall 14 and the inner wall surface of the treatment tank 11 functions as a water tank 20 for self-balancing described later. This water tank 20 is provided with an opening for supplying water at the top in the figure.
On the other hand, the partition wall 15 faces the inner wall surface of the processing tank 11 where the regenerated liquid recovery hole 12 is provided, and functions as a communication part between the lower end of the partition wall 15 and the bottom surface of the processing tank 11. It is provided so that a gap is formed. A space surrounded by the partition wall 15 and the inner wall surface of the treatment tank 11 serves as a recovery / regeneration liquid storage unit that stores the cleaning / regeneration liquid.

In this embodiment as well, as in the case of the conventional waste liquid regenerating apparatus, the positive electrode 17 is connected to the lower end of the partition wall 15 and the inner wall surface of the treatment tank 11 provided with the regenerating liquid recovery hole 12 by a known method. also with the horizontally disposed between, to function layer of water 7 which is formed in the bottom of the treatment tank 11 as an earth electrode.
And the area | region pinched | interposed by the partition wall 14 and the partition wall 15 mentioned above functions as the waste liquid supply part 18 which is the space where the waste liquid 6 or the washing | cleaning liquid mentioned later is supplied and stored. The upper opening 18a formed by the partition wall 14 and the partition wall 15 functions as a waste liquid supply port for supplying the waste liquid 6 or the cleaning liquid to this space.
In the present embodiment, since the electrode plate 17 serving as a positive electrode is provided horizontally at the lower end portion of the partition wall 15, the height difference between the partition wall 14 and the lower end portion of the partition wall 15 can be set to the maximum. The distance between the electrodes will be affected.

Hereinafter, the processing steps in the waste liquid recycling apparatus 1 will be described in detail.
FIG. 1A shows a situation at the start of use of the waste liquid regenerating apparatus according to the present embodiment, in which the waste liquid 6 is not contained in the tank of the waste liquid regenerating apparatus 1. Here, the water 7 for negative electrodes is poured into the water tank 20 for self-balancing of the present invention installed adjacent to the partition wall 14 of the treatment tank through the supply port 20a to a predetermined water level (h3).

Thereafter, as shown in FIG. 1B, a new cleaning liquid or regenerated cleaning liquid 8 is supplied to the waste liquid supply unit 18 through the waste liquid supply port 18a .
Here, the new washing liquid or reproducing cleaning liquid 8 supplies a lighter specific gravity than water specific gravity ([rho] 2 = 0.7-0. 8 extent). Therefore, the supplied new cleaning liquid or regenerated cleaning liquid 8 is not mixed with the water 7 forming a layer at the bottom of the treatment tank 11, but is put on the water 7. If new cleaning liquid or regenerated cleaning liquid 8 is supplied as it is, the water 7 at the bottom of the treatment tank 11 flows into the adjacent water tank 20 for self-balancing due to the weight of the regenerated cleaning liquid 8. The water level (h1) is lower than the water level (h3) of 1 (a).
Then, the new cleaning liquid or the regenerated cleaning liquid 8 is supplied until the new cleaning liquid or the regenerated cleaning liquid 8 fills the processing tank 11 and is discharged from the regenerated liquid recovery hole 12. At this time, the water level (h0) in the water tank 20 is (h0 × ρ1) = (h1) where the water level of the water 7 layer is h1, the solvent water level is h2, the water specific gravity is ρ1, and the solvent specific gravity is ρ2. Although the relational expression h1 × ρ1) + (h2 × ρ2) is satisfied, in this embodiment, the natural drainage hole 13 is installed at the balanced position (h0). Thereby, the amount of the waste liquid 6 and the water 7 in the waste liquid treatment tank is kept at a constant ratio. As a result, the distance between the positive electrode and the negative electrode can be controlled to be constant by keeping the water level of the water and the cleaning liquid in the waste liquid treatment tank constant.

Specifically, if the specific gravity of the solvent (cleaning liquid) is ρ 2 = 0.7, the water level of the electrode water is h1 = 30 mm, and the water level of the solvent (waste liquid) is h2 = 100 mm, the water level in the water tank 20 is h0. = 100 mm.
Therefore, if the natural drainage hole 13 is provided at a position of 100 mm from the bottom of the tank, both are balanced. In the present embodiment, the distance LD between the electrode plate 17 and the water surface is designed to be LD = 35 mm in order to cope with the specific gravity of the waste liquid 6 slightly changing depending on the type of solvent.
Although not illustrated, natural drainage hole 13 is a stretch of pipe-shaped configuration, more and more preferably has a structure capable of adjusting the position of the drain holes in accordance with the specific gravity of the waste (ink pigment) 6.

Subsequently, when the new cleaning liquid or the regenerated cleaning liquid 8 and the water 7 are in a balanced state, the supply of the waste liquid 6 is started as shown in FIG. An electrostatic field is generated with a layer of water 7 connected to the electrodes. Due to the generation of this electric field, the waste liquid in the treatment tank 11 is separated into a solvent, an ink pigment, and water, and the water and the ink pigment settle to the bottom, and the cleaning liquid is recovered from the regeneration recovery hole 12 as the regenerated cleaning liquid 8.
In this embodiment, the water 7 separated from the waste liquid 6 by the electrostatic field settles at the bottom, but is naturally drained from the natural drain hole 13 of the water tank 20 while maintaining the water level (h1). .
Therefore, even when the waste liquid is continuously supplied and the water 7 increases while the cleaning liquid 8 is regenerated, the water 7 is naturally drained in a self-balanced state, so the water level (h1) is almost constant. As a result, the distance (LD) between the electrode plate 17 and the ground electrode (water surface) is kept substantially constant at the design value.
This keeps the water level (h1) of the ground electrode in the treatment layer constant, eliminating the need for the water level gauge, electromagnetic open / close valve, and control device used in the conventional device configuration, and making the device easily with a simple device configuration. Manufacturing costs can be greatly reduced. Moreover, the risk of trouble occurring due to the self-balancing method without using sensors or control devices can be drastically reduced.

[Second Embodiment]
Hereinafter, as a second embodiment of the present invention, an outline of a two-tank waste liquid regenerating apparatus 2 will be described with reference to FIG. Note that components having the same functions as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.
FIG. 2 is a schematic configuration diagram showing the waste liquid recycling apparatus 2 for the printing press according to the present embodiment.
The waste liquid regenerating apparatus 2 includes a first regenerating liquid processing tank 21 (hereinafter also referred to as a first processing tank) and a second regenerating liquid processing tank 22 (hereinafter also referred to as a second processing tank). The first processing tank 21 and the second processing tank 22 are partitioned by a dam wall 23 arranged in the vertical direction.
Further, a self-balancing water tank 20 is provided on the left side of the waste liquid recycling apparatus 1 in the figure, but more specifically, the self-balancing water tank 20 is partitioned by a wall portion 44 and a partition plate 45. It is provided at a position adjacent to the supply unit 18 for the waste liquid 6 discharged from the printing press. A gap (communication portion) 46 communicating with the first treatment tank 21 side is provided at the lower portion of the wall portion 44 that forms the wall of the water tank 20.
The lower part of wall portion 44 by a gap 46 is open, the water 7 is a ground electrode of the bottom portion, and has a configuration that can flow out to the self-balanced water tank 20.
In addition, a partition plate 45 is provided between the dam wall 23 of the first treatment tank 21 and the opposite side wall portion 44 opposed thereto, and the partition plate 45 is arranged in the vertical direction. However, the lower end portion extends to a substantially intermediate position of the first processing tank 21 so that the lower end portion of the partition plate 45 is positioned above the lower end portion of the wall portion 44.

Water 7 used as a negative electrode is placed at the bottom of the first treatment tank 21. For this reason, a special electrode is not required. As the positive electrode, a mesh-type electrode plate 17 is used, which is horizontally disposed between the partition plate 45 and the dam wall 23 and has a large number of holes through which the cleaning liquid can flow. Although the distance between the electrodes is determined by the position of the electrode plate 17, for example, in the present embodiment, the waste feed stream weight q = 0.5L / mi n, the applied voltage was 5 kV, the suitability field strength DV = When 0.125V / mm, the distance between the water surface 7 of the positive electrode 17 and negative electrode provided so that LD1 = 40 mm.

In the second processing tank 22, adjacent to the weir wall 23 side, the supply portion 24 of the treated washing liquid is provided, the supply unit 24 is formed by the weir wall 23 and the partition plate 25. The cleaning liquid flows into the supply unit 24 beyond the dam wall 23 and is supplied to the second treatment tank 22. The partition plate 25 is arranged in the vertical direction, and the lower end portion extends to a substantially upper and lower intermediate position of the second processing tank 22, and the supply unit 24 side and the mesh electrode plate 26 side communicate with each other through a gap between the partition plate 25 and the bottom surface. . In parallel with the partition plate 25, a partition plate 27 serving as a constituent wall surface of the processing tank 22 is disposed. Further, a collection tank 30 is disposed adjacent to the partition plate 27.
In the second treatment tank 22, the treated cleaning liquid passes through the partition plate 27, is supplied to the collection tank 30, and is collected from the collection tank 30 to a collection device (not shown).
Here, the plus electrode in the second treatment tank 22 is configured by a mesh-shaped electrode plate 26 that is arranged in the horizontal direction between the partition plate 25 and the partition wall 27 and has a large number of holes through which the cleaning liquid can flow. .

The second processing tank 22 is different from the first processing tank 21 in that water is not used as a negative electrode in the processing tank, and the container bottom itself is used as a negative electrode 28 or a negative electrode 28 is provided on the bottom. The configuration is adopted. The reason why the configuration of the negative electrode 28 is different from that of the treatment tank 21 is that most of the water has already been separated in the first treatment tank 21, and the applied voltage is not discharged when water is not used as the negative electrode. The electric field strength can be increased.
Therefore, in this embodiment, a voltage of 5 kV is used for the mesh electrode plate 26 and the negative electrode 28 that are the positive electrodes of the second treatment tank 22. The distance to the negative electrode (container bottom) 28 is LD2 = 30 mm. The electric field strength in this case is DV = 5/30 = 0.17 kV / mm, and the regenerated cleaning liquid supply flow rate q = about 0.5 L / min is good.

Hereinafter, the operation of the waste liquid recycling apparatus according to the present embodiment will be described.
As shown in FIG. 2, a predetermined amount of ground electrode water is supplied from the self-balance water tank 20 to the bottom of the first treatment tank 21.
Thereafter, a new cleaning liquid or a regenerated solvent (regenerated liquid) is supplied to the first processing tank 21 and the second processing tank 22 to a full extent. Here, the water in the water tank 20 is a water level (h0) balanced between the water level (h1) of the water 7 at the bottom of the first treatment tank 21 and the water level (h2) of the new cleaning liquid or the regenerated solvent (regenerated liquid). ) And drained from the natural drain hole 13 to maintain a predetermined water level balance.
In this state, when the waste liquid 6 is supplied while applying the applied voltage, the waste liquid 6 passes through the lower part of the partition plate 45 and moves to a place where the mesh electrode 17 is present. And it is isolate | separated into the water 7, the ink pigment 9, and the washing | cleaning liquid (solvent) by an electrostatic field effect. The water 7 settles in the lower part of the container, and the ink pigment 9 adheres to the surface of the water 7 which is a negative electrode. Then, the regenerated cleaning liquid 8 passes through the holes of the mesh electrode 17 and flows into a region to be a solvent recovery unit located above the mesh electrode 17.

The regenerated cleaning liquid 8 that has flowed into the solvent recovery unit 20 of the first processing tank 21 flows over the weir wall 23 of the first processing tank 21 and flows into the supply unit 24 of the second processing tank 22. The regenerated cleaning liquid flowing into the second processing tank 22 is separated and regenerated almost cleanly in the first processing tank 21, but the remaining ink pigment is completely separated from the second processing tank 22. It is an installation purpose.
The fine ink pigment 9 separated in the second treatment tank 22 adheres to and accumulates on the bottom of the container, which is the negative electrode 28. The regenerated cleaning liquid 8 that has passed through the mesh electrode 26 flows over the wall 27 of the second treatment tank 22 and flows into the recovery tank 30 for the regenerated cleaning liquid 8 . The regenerated cleaning liquid 8 that has flowed into the recovery tank 30 is recovered by the recovery device 30 and used for the next cleaning.

On the other hand, the water separated in the first treatment tank 21 settles to the bottom of the first treatment tank 21, but here, the settled water 7 is self-reacting from the lower part of the partition wall 44 by the self-balancing configuration of the present invention. It flows out to the water tank 20 for balance. The water level of the water tank 20 rises due to the outflowed water, but since the natural drain hole 13 is provided at the predetermined water level (h0) position, the increased water is drained to the outside naturally, and the water level at the bottom of the treatment tank (H1) is held at a substantially constant amount.
As a result, the distance (LD1) between the surface of the water serving as the ground electrode and the positive mesh electrode 17 is kept substantially constant, and stable electrostatic separation can always be performed.

  As described above, the waste liquid 6 supplied to the first treatment tank 21 is primarily separated in the first treatment tank 21 and secondarily separated in the second treatment tank 22, and separated and recovered with high purity. The This process is performed continuously. Here, the ink pigment 9 and the water 7 separated into the processing tank are periodically discharged out of the processing tank by respective dedicated recovery devices.

[Third Embodiment]
Hereinafter, as a third embodiment of the present invention, an application example when the present invention is used in a waste liquid regenerating apparatus as a total system including a drain tank, a waste liquid tank, and a regenerated liquid tank will be described. In addition, the same code | symbol is attached | subjected to the component which has the function similar to previous embodiment, and description is abbreviate | omitted.
FIG. 3 is a schematic configuration diagram of the waste liquid recycling system according to the present embodiment. The waste liquid recycling apparatus 3 according to the present embodiment includes a first processing tank 21 and a second processing tank 22 as in the second embodiment described above.
The first treatment tank 21 includes a supply unit 18 for the waste liquid 6, partition plates 44, 45, and 47, and water 7 as a ground electrode. Further, a water tank 20 for self-balancing is provided adjacent to one partition plate 44, and this water tank 2 can be expanded and contracted in a double structure so as to be used for natural drainage at a predetermined position (h0). The drainage pipe 81 is provided. Drainage pipe 8 1 is a transfer pipe to the drain tank 32.
The double-structured drainage pipe 81 that can be expanded and contracted is for the purpose of coping with the change in the specific gravity of the waste liquid 6 that varies depending on the type of ink used in the printing press. The balance water level (h0) is determined according to the specific gravity of the waste liquid 6. It can be adjusted.

Further, the partition plate 44 and the partition plate 45 are adjacent to each other, thereby forming the supply unit 18 for the waste liquid 6 therebetween. The mesh electrode 17 is attached to the other partition plate 45. The mesh electrode 17 determines the applied voltage according to the distance LD1 with the water surface. For example, in the present embodiment, the applied voltage is 5 kV and LD1 = 35 mm.
In the case of an ink pigment that is easily separated by an electrostatic field, LD = 30 to 40 mm, and in the case of a pigment that is difficult to separate, the ink pigment that is separated and deposited on the water surface is the electrode that has LD = 25 to 30 mm. 6 can be prevented and can be operated safely.

Then, a configuration is adopted in which the regenerated cleaning liquid 8 flows from the first processing tank 21 to the second processing tank 22 via a circulation unit 50 that supplies the cleaning liquid.
The second treatment tank 22 includes a supply unit 24 for the regenerated cleaning solution 8 , but is partitioned by two partition plates 25 and 48 having a gap in the lower part.
Here, in the first processing tank 21 and the second processing tank 22 described above, two partition plates 47 and 48 are provided so as to be sandwiched between the central portions of the liquid supply units 18 and 24. The reason why the partition plates 47 and 48 are provided is to prevent the waste liquid 6 or the cleaning liquid from being stirred in the treatment tank. The regenerated cleaning liquid 8 processed in the second processing tank 22 flows into the recovery tank 30 via the circulation part 51 and is recovered.

Next, supply of water and waste liquid 6 , recovery of the regenerated cleaning liquid 8 , and a method for draining and removing the separated water and ink pigment will be described.
The water 7 used as the negative electrode is supplied in advance to a predetermined position manually or by a pump (not shown). Here, the water level h0 of the water tank 20 is determined in the same manner as in the above-described embodiment, but is adjusted by the upper opening position of the drainage pipe 81.
Then, after supplying the water 7, the waste liquid 6 is pumped from the waste liquid tank 31 to the supply section of the first treatment tank 21 through the supply pipe by the liquid feed pump 34.
The regenerated cleaning liquid 8 completely processed in the second processing tank 22 is collected in the regenerated liquid tank 33 by opening the valve 35. The flow rate regulating valve 42 is a valve that regulates the flow rate between the first treatment tank 21 and the waste liquid tank 31.
In addition, the water 7 separated by the regeneration process and settled on the bottom side of the first treatment tank 21 flows into the water tank 20, and the water 7 exceeding the predetermined water level (h0) can be expanded and contracted by a double structure. The water is drained by the pipe 81 and collected in the tank 32 by the pipe.
The above-described waste liquid supply, reclaimed liquid recovery, and separated water drainage operations are continuously performed during the processing operation.

The removal of the ink pigment separated by the treatment is performed after the above-described treatment operation is stopped. This ink pigment removal operation is performed periodically (for example, once / week). The procedure is as follows.
The drain pipe valves 36 and 37 provided in the lower part of the first treatment tank 21 and the second treatment tank 22 are opened, and the waste liquid 6 and water are supplied to the ink pigment removal filter 38 provided immediately before the waste liquid tank 31. Drain together with 7.
At this time, the ink pigment separated and adhering to the surface of the water 7 is discharged together with the waste liquid 6 and the water 7, but the ink pigment adheres to the filter 38 by the filter 38, and the waste liquid 6 and the water 7. Is collected in the waste liquid tank 31. The ink pigment adhering to the filter 38 is discarded together with the filter provided in the filter 38. Thereafter, a new filter is set in the filter 38 and waits until the next processing.

The embodiment of the present invention has been described above. Of course, the present invention is not limited to this, and various modifications and changes can be made based on the technical idea of the present invention.
For example, in the above-described embodiment, two regenerated liquid treatment tanks are provided, but three or more tanks may be provided by adding the first treatment tank 21 and / or the second treatment tank 22 or ink. Only the first treatment tank 21 may be used depending on the components of the pigment.
Further, the self-balance water tank 20 is provided with a drainage pipe 81 that can be expanded and contracted with a double structure for natural drainage. However, the natural drainage hole 13 described above is not limited to this and is provided outside the tank 20. The method of providing may be sufficient.

It is a schematic block diagram which shows the waste liquid reproduction | regeneration apparatus which concerns on the 1st Embodiment of this invention. 1A shows a water injection state, FIG. 1B shows a cleaning liquid supply state, and FIG. 1C shows a regeneration operation state. It is a schematic block diagram which shows the waste liquid reproduction | regeneration apparatus which concerns on the 2nd Embodiment of this invention. It is a schematic block diagram which shows the waste liquid reproduction | regeneration apparatus which concerns on the 3rd Embodiment of this invention. It is the cross-sectional schematic of the example of 1 structure of the conventional waste liquid reproduction | regeneration apparatus. It is a schematic sectional drawing which shows the fundamental structure of the conventional waste-liquid reproduction | regeneration apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Waste liquid reproduction | regeneration apparatus 2 Waste liquid reproduction | regeneration apparatus 3 Waste liquid reproduction | regeneration apparatus 5 Waste liquid reproduction | regeneration apparatus 7 Water 8 Regenerated washing | cleaning liquid 9 Ink pigment 11 Treatment tank 12 Recycled liquid collection | recovery hole 13 Natural drainage hole 14,15 Partition wall 16 Communication part 17 Mesh electrode 18 Waste liquid supply Section 20 Water tank 21 First regeneration liquid treatment tank 22 Second regeneration liquid treatment tank 23 Weir wall 24 Supply section 25 Partition plate 26 Mesh electrode 27 Partition plate 28 Negative electrode 30 Recovery tank 31 Waste liquid tank 32 Waste tank 33 Regeneration liquid Tank 34 Liquid feed pump 35-37 Valve 38 Pigment removal filter 42 Flow regulating valve 44, 45 Partition plate 61 Processing tank 62 Partition plate 63, 66 Vertical wall 65 Gap 67 Electrode 68 Ink pigment 69 Separated water 70 Separated and aggregated Water 72 Water level gauge 73 Drain hole 74 Valve

Claims (5)

A treatment tank for storing waste liquid containing water used in the printing press;
In a waste liquid regenerating apparatus comprising an electric field generating means for generating an electric field in the processing tank,
A first partition wall for partitioning the inside of the treatment tank ;
A water storage tank that is one space partitioned by the first partition wall in the treatment tank ;
A drain opening provided in the water storage tank;
A first gap provided between a bottom surface of the treatment tank and the first partition wall;
It said electric field generating means, the water contained in the waste liquid, is electrostatically agglomerate at the bottom of the treatment tank,
The gap, the were electrostatically agglomerated water, acts as a communicating unit that derives the water reservoir from the other space partitioned by the first partition wall of the processing bath,
The wastewater recycling apparatus , wherein the drainage opening functions as a water level adjusting mechanism that naturally drains the water in the water storage tank and adjusts the water level in the water storage tank to a predetermined water level . Wherein the predetermined water level, characterized in that it is determined based on the specific gravity of the waste liquid to be processed, according to claim 1 Symbol placement of waste reproducing apparatus.   The drain opening is a drain hole,
  The treatment tank has the bottom surface and a peripheral wall,
  The drain opening is provided in the peripheral wall;
  The first partition wall is provided so as to face the first inner wall surface provided with the drainage opening of the peripheral wall.
The waste liquid regenerating apparatus according to claim 1 or 2, characterized by the above.   The treatment tank has the bottom surface and a peripheral wall,
  The water storage tank is provided with an extendable drain pipe having an upper opening corresponding to the drain opening.
The waste liquid regenerating apparatus according to claim 1 or 2, characterized by the above.   A regenerating liquid recovery hole provided in the peripheral wall forming the other space;
  The lower wall is opposed to the second inner wall surface of the peripheral wall provided with the regeneration liquid recovery hole, and the lower end portion is disposed above the lower end portion of the first partition wall. A recovered and regenerated liquid storage section provided between the second partition wall provided so that a gap is formed therebetween,
  A positive electrode horizontally disposed between a lower end portion of the second partition wall and the second inner wall surface;
  A ground electrode that is a negative electrode provided on the bottom surface of the treatment tank,
  The electric field generating means includes the positive electrode and the negative electrode.
The waste liquid regenerating apparatus according to claim 3 or 4, characterized by the above.

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