JPH06206062A - Solidification of waste photographic processing solution - Google Patents

Abstract

PURPOSE:To increase processing capacity without increasing energy consumption quantity and to prevent the danger accompanied by a strong basic waste soln., in the solidification of the waste photographic processing soln., by adding an acid to the waste photographic processing soln. to raise the temp. of the soln. and immediately supplying this waste photographic soln. to a rotary disc. CONSTITUTION:In the solidification of a photographic processing soln., at first, the waste soln. is sucked up by a pump 3 and an acid soln. is sucked up by a pump 4 to mix the waste soln. and the acid soln. in a mixing tank 5 under stirring and the resulting mixture is sent to the liquid supply nozzle 13 of a solidifying device 10 in a definite amt. immediately after mixing by a pump 9. A nozzle 13 is constituted so as to drip a liquid to a liquid supply member 14 from a plurality of the orifices thereof and the mixed waste soln. is applied to a rotary disc 15 from the slit formed to the lower end of the liquid supply member 14. The rotary disc 15 is heated by a heating medium 16 to be held to constant temp. and the coated waste soln. is dried with the rotation of the disc 15 to become a solid which is, in turn, allowed to fall from the gap between an apparatus wall and the disk 15 by a scraping blade.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for treating a waste liquid generated by processing a photographic light-sensitive material, and more particularly to a treatment method suitable for solidifying a strongly basic processing waste liquid.

[0002]

2. Description of the Related Art A photographic light-sensitive material, for example, a light-sensitive lithographic printing plate using an o-quinonediazide compound, a diazo compound or the like as a light-sensitive component is usually processed by using an automatic developing machine.
While carrying the image-wise exposed photosensitive lithographic printing plate, a developing step of applying a basic developer to the surface of the photosensitive layer to elute the photosensitive layer in an imagewise manner, and, if necessary, washing with water after the developing step. Processes, treatments with a rinse solution, desensitizing treatments, and the like are added. In such a process, in the developing step, the developing solution contained in the developing solution tank is supplied from the shower nozzle to the plate surface, and the flowing down developing solution is returned to the developing solution tank and repeatedly used, and the developing tank containing the developing solution is used. A method of immersing and developing a photosensitive lithographic printing plate, and a method of applying a new liquid to the surface of the photosensitive layer and developing are performed.

In the method in which the developing solution is repeatedly used, the components consumed by the treatment are replenished, and the components mixed in the treatment solution by the treatment or concentrated by evaporation are removed so that the performance of the treatment solution is kept constant. In order to maintain the above-mentioned replenishment, a replenishing solution is replenished with the processing solution,
In order to remove the above-mentioned concentrated components, a part of the treatment liquid is discarded, and when the performance of the treatment liquid is out of the allowable limit, the whole treatment liquid is discarded. Further, in the developing method in which a new liquid is applied, the liquid used for the development is a waste liquid.

By the way, as a method for treating waste liquid discharged in the photographic processing of a photosensitive material such as a photographic film or a photographic paper,
A developing waste treatment device has been proposed which drops a developing waste liquid onto a heated rotating disk to heat it to condense or solidify it and scrape off a condensate or a solid substance (Japanese Patent Laid-Open No. Sho 63-63).
-128345).

[0005]

However, in the above technique, it takes a relatively long time to raise the temperature of the waste liquid on the rotating disk, the processing capacity is limited, and the energy consumption is required to increase the processing capacity. There is a problem in that the waste liquid of strong basicity spatters on the rotating disk and the safety of the processing operation is impaired.

It is an object of the present invention to provide a method for treating photographic processing waste liquid which solves the above problems. That is,
It is an object of the present invention to provide a method of solidifying a photographic processing waste liquid by a rotating disk, which increases the processing capacity without increasing the energy consumption of the heating rotating disk and prevents the danger associated with the processing of a strongly basic waste liquid.

[0007]

The object of the present invention is to provide a heated rotating disk and solidify the photographic processing waste liquid on the surface thereof, after adding an acid to the photographic processing waste liquid and raising the temperature, It is achieved by a method for solidifying a photographic processing waste liquid, which is characterized in that it is immediately supplied onto a rotating disk.

The present invention will be described in detail below.

In the present invention, the acid added to the photographic processing waste liquid may be any acid that has the effect of neutralizing the base. Mineral acids such as sulfuric acid and hydrochloric acid are preferable from the viewpoint of effect size and cost. As a mixing method, any method can be used, for example, a method of stirring while adding an acid liquid such as sulfuric acid or hydrochloric acid in a stirring tank, a method of mixing a waste liquid and an acid liquid in a liquid mixer Etc. can be used, but in order to supply the liquid onto the rotating disk immediately after the temperature rise, it is preferable to use a method in which the liquid is mixed with a continuous mixer and then continuously supplied onto the rotating disk.
As long as the temperature of the waste liquid is sufficiently raised when the waste liquid is supplied onto the rotating disk, the waste liquid does not necessarily have to have a neutral pH of about 6 to 8 and may have a higher pH. In the present invention, "immediately" refers to a time period in which the temperature of the waste liquid is raised by the heat of neutralization and is not cooled to the temperature before the temperature is raised, preferably when the waste liquid exhibits the maximum temperature by mixing the acid. Within 5 minutes, more preferably within 1 minute. In addition, the temperature of the waste liquid when supplied on the rotating disk was
It is preferable that the temperature is higher than 30 ° C.

FIG. 1 is a schematic sectional view showing an example of an apparatus (solidifying apparatus) used in the solidifying method of the present invention. Figure 2
1 is a sectional view taken along line I-I in FIG. 1, FIG. 3 is a liquid supply member in FIG.
It is a top view which shows a rotating disk and a scraping blade part. In these figures, 1 is a waste liquid tank, and 2 is an acid liquid tank for containing an acid liquid such as sulfuric acid. The waste liquid is sucked up by the pump 3 and the acid liquid is sucked up by the pump 4, and mixed in the mixing tank 5 while being stirred by the stirring blade 6. PH in the mixing tank 5
A sensor 7 and a temperature sensor 8 are provided to control the operation of the pumps 3 and 4 while checking the mixing status. Immediately after the acid is mixed, the pump 9 pumps a fixed amount of the solidification device.
It sends to the liquid supply nozzle 13 of 10. The liquid supply nozzle 13 has a plurality of holes arranged in the axial direction of the pipe, through which liquid can flow out,
The liquid is made to drip from this hole to the liquid supply member 14. As shown in FIG. 2, the liquid supply member 14 has a structure in which the upper portion is fixed with a gap and the lower end forms a slit, and the coating amount can be adjusted by adjusting the slit gap.
The plastic sheets 26 and 27 include the clasps 28 and 29 and the support rod 30,
It is configured to be fixed at a fixed position by 31.
32 and 33 are screws for fixing the stopper plate to the support rod. The waste liquid dropped from the liquid supply nozzle 13 is a plastic sheet 26,
It is stored between 27 and is applied on the rotating disk 15 from the slit at the lower end according to the rotation of the disk 15. The rotating disk 15 is heated by the heating medium 16 and kept at a constant temperature. Figure 3
As shown in FIG. 4, the waste liquid 36 applied on the rotating disk 15 is dried and solidified with the rotation of the disk 15, and the scraping blade 19 causes the solid content 38 to drop from the gap between the apparatus wall 20 and the disk 15. To do. The means for supplying the waste liquid to the rotating disk is not limited to the above, and any means such as supplying from the cross section of the pipe tip or using an apparatus having a structure similar to an extrusion type applicator or a roll type applicator used for ordinary application Can be adopted.

The present invention is characterized in that an acid is added to a basic photographic processing waste liquid to raise the temperature of the liquid, and immediately after the temperature is raised, the liquid is supplied onto a rotating disk. The basic waste liquid includes the following.

That is, a photosensitive material having a negative type photosensitive layer using a diazo compound as a photosensitive substance, a photosensitive material having a positive type photosensitive layer using an o-quinonediazide compound as a photosensitive substance, and a photopolymer as a photosensitive substance. The light-sensitive material used is a processing solution such as a developing solution, washing water,
Treatment waste liquid treated with rinse liquid, desensitizing treatment liquid, etc.

More specifically, for example, JP-A-62-175757
No. 62, No. 62-24263, No. 62-24264, No. 62-25761, No. 62
-35351, 62-73271, 62-75535, 62-89060
No. 62, No. 62-125357, No. 62-133460, No. 62-159148,
62-168160, 62-175757, 62-175758, 62-
238565, 63-188141, 63-200154, 63-20565
Waste liquid of a developing solution produced by a combination of a photosensitive lithographic printing plate and a developing solution as described in JP-A No. 8-159654 and JP-A No. 1-159654.

Waste liquid of a developing solution produced by a combination of a photosensitive material having a constitution in which a photosensitive layer and a silicone layer are laminated as an ink repellent layer on a substrate as described in, for example, JP-A 1-149043 and the like, and a developing solution thereof. .

For example, the processing waste liquid of the rinse liquid described in JP-A-62-58253, the processing waste liquid of the desensitizing liquid described in JP-A-62-58255, and the like.

A photolithographic printing plate having a photoconductive layer on a support, a toner image is formed by an electrophotographic method, and the photoconductive layer in the non-image area is removed to obtain a lithographic printing plate. A processing waste liquid generated, for example, a processing waste liquid generated by processing an electrophotographic lithographic printing plate as described in JP-A Nos. 63-267954 and 63-271481.

[0017]

【Example】

Example 1 The following waste liquid was solidified using the apparatus shown in FIG.

As a photographic light-sensitive material, a positive-working light-sensitive lithographic printing plate KM (trade name, manufactured by Konica Co., Ltd.) having a size of 1003 mm × 800 mm was processed with a developer having the following composition by using an automatic processor, and then circulated. It was washed with water and finally treated with a rinse liquid having the following composition.

<Developer composition> A Potassium silicate (manufactured by Nippon Kagaku Kogyo Co., Ltd.) 2000 g Potassium hydroxide 300 g Water 10 l Waste solution of developer after processing 1000 sheets of the above photosensitive lithographic printing plate 12
1, waste water 15 l of washing water, and waste liquid 5 l of the rinse liquid were put into the waste liquid tank 1 shown in FIG. 1 and treated.

The above waste liquid was put in the tank 1 and industrial 50 ° Baume sulfuric acid was put in the acid liquid tank 2, and both were mixed in the mixing tank 5. The liquid temperature at pH 6.9 is 74 ° C, which is 48 ° C higher than the liquid temperature 26 ° C in the waste liquid tank 1. 36 ml of this
/ Min on a rotating disk 15 having a surface temperature of 120 ° C., a completely dried solid content was obtained. At this time, before the waste liquid is supplied from the mixing tank 5 to the rotating disk 15, 48
It took seconds.

Comparative Example 1 Waste liquid was treated using the apparatus shown in FIG. However,
At this time, the acid liquid tank 2 was empty and was supplied onto the rotating disk 15 without mixing with the sulfuric acid. The liquid temperature in the mixing tank 5 was 27 ° C. It was necessary to reduce the flow rate to 20 ml / min in order to completely solidify it.

Example 2 Waste liquid was treated using the apparatus shown in FIG. The waste liquid used is shown below.

As a photographic light-sensitive material, a positive photosensitive lithographic printing plate KH (trade name, manufactured by Konica Corporation) 1003 mm × 800 mm
The size and the same size of the negative photosensitive lithographic printing plate KW (the same) are processed with a developer having the following composition using an automatic developing machine,
Then, it was washed with water that was circulated and finally treated with a gum solution having the following composition.

<Developer composition> N-phenylethanolamine 6.0 g Propylene glycol 50.0 g pt-Butylbenzoic acid 150.0 g Emulgen 147 (trade name, nonionic surfactant, manufactured by Kao Corporation) 5.0 g Potassium sulfite 300.0 g Glucon Acid solution (50% aqueous solution) 100.0g Triethanolamine 25.0g A Potassium silicate (manufactured by Nippon Kagaku Kogyo Co., Ltd.) 400.0g Potassium hydroxide 200.0g Water 11.5l Developer for processing 500 sheets of each of the above photosensitive lithographic printing plates 12 l of waste liquid and 15 l of washing waste liquid were treated.

This waste liquid was put in a waste liquid tank 1, industrial 50 ° Baume sulfuric acid was put in an acid liquid tank 2, and both were mixed in a mixing tank 5. When the pH reaches 7.3, the liquid temperature is 62 ° C,
This is 36 ° C higher than the liquid temperature in the waste liquid tank 1 of 26 ° C. this
When it was fed at a rate of 33 ml / min onto a rotating disk 15 having a surface temperature of 130 ° C., a completely dried solid content was obtained. Mixing tank 5
It took 52 seconds from the time when it was supplied to the rotating disk 15 to the time when it was supplied.

Comparative Example 2 Waste liquid was treated using the apparatus shown in FIG. However,
At this time, the acid liquid tank 2 was emptied and not used. The waste liquor was therefore fed onto the rotating disk 15 without mixing with sulfuric acid. The liquid temperature in the mixing tank 5 was 27 ° C. A flow rate of 19 ml / min was required to completely solidify it.

[0027]

According to the present invention, in a method of solidifying a basic waste liquid discharged in the processing of a photographic light-sensitive material with a rotating disk, the processing capacity is increased without increasing the energy consumption, and the waste liquid is increased. Provided is a solidification method for photographic processing waste liquid, which can prevent the danger of splashing of strongly basic waste liquid during processing.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view showing an example of an apparatus for carrying out the method of the present invention.

2 is a cross-sectional view of a liquid supply unit of the apparatus shown in FIG.

FIG. 3 is a plan view of the inside of a device wall 20 of the device shown in FIG.

[Explanation of symbols]

 1 Waste liquid tank 2 Acid solution tank 5 Mixing tank 10 Solidifying device 13 Liquid supply nozzle 14 Liquid supply member 15 Rotating disk 16 Heating medium 22 Recovery device 24 Condenser 25 Activated carbon bed

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Akira Nogami 1st Sakura-cho, Hino City, Tokyo Konica Stock Company In-house

Claims (1)

[Claims] 1. A method of providing a heated rotating disk and solidifying the photographic processing waste liquid on the surface thereof, wherein an acid is added to the photographic processing waste liquid, the temperature is raised, and the photographic processing waste liquid is immediately supplied onto the rotating disk. Method for solidifying photographic processing waste liquid.