JPS60196751A - Treatment of photographic waste solution - Google Patents

Abstract

PURPOSE:To solve a problem on environmental pollution control by adding an alkali salt of chelating agent or a neutralizing soln. contg. the chelating agent to a used processing soln. contg. a Ce compd. and using color change or a pH of solubilizing an insoluble matter as a sign of discharge. CONSTITUTION:An alkali salt of a chelating agent or a neutralizing soln. contg. the chelating agent is added to a soln. contg. a Ce compd. used in a photographic processing step and the processing soln. is discharged at a color changing point or at a pH of solubilizing an insoluble matter. As the neutralizing soln., an alkali metal, ammonium hydroxide, alkali metal and ammonium salts of a weak acid are used, and as the chelating agent, an org. chelating agent exhibiting alkalinity in an aq. soln. and alkali salts of the chelating agent and a combination of them are used. The chelating agent or its alkali salt is used in an equimolar amt. of the Ce compd. or more. Such a neutralizing soln. is used in a pH of >=10, preferably, >=12, and in a concn. enough to neutralize said reducing Ce soln. The time when it is processed with such a neutralizing soln. and the orange yellow and orange red colors of the reducing soln. changes to yellow, and an insoluble matter is solubilized at the same time indicates the time that the soln. needs to be discharged.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for processing photographic waste liquid, and relates to a method for processing a used solution containing a cerium compound used as a photographic reducing liquid or a cleaning liquid for a photographic processing machine in a photographic processing process. It is.

For example, JP-A No. 50-27543 and JP-A No. 51-14073 are related to reducing fluids using cerium compounds.
No. 3 is known. Further, as a method for cleaning photographic processing equipment using cerium compounds, for example, Japanese Patent Application Laid-Open No. 50-23
No. 229 is known. As can be seen from the specification, these reducing fluids and cleaning fluids for photographic processing equipment are highly acidic, and it is not desirable for environmental protection to dispose of them as they are, so they must be neutralized before being disposed of. However, when neutralized with an ordinary alkaline agent, a large amount of insoluble matter is generated, and it cannot be disposed of as is.Furthermore, when neutralized with an alkaline agent after cleaning the automatic processor, the generated impurities adhere to the automatic processor.
It becomes more difficult to remove this insoluble matter.

The object of the present invention is to provide a method for treating a used reducing liquid or cleaning liquid using a cerium compound, and a method for neutralizing a used reducing liquid or cleaning liquid using a cerium compound. In addition, it is a treatment method that does not generate insoluble matter even if the reducing solution and cleaning solution are neutralized after use, and the disposal point of the reducing solution and cleaning solution after use is not discolored or dissolved by insoluble matter. This is a processing method to know.

As a result of various studies, the present inventor found that the above object can be achieved by the following method. That is, in a method of discarding a solution containing a cerium compound used in a photographic processing process, an alkali salt of a chelating agent or a neutralizing solution containing a chelating agent is added to a solution containing a cerium compound to maintain a pH that causes discoloration and/or dissolves impurities. This is a method for disposing of photographic waste liquid.

Examples of substances used in the neutralizing solution used in the present invention include alkali metal and ammonium hydroxides of weak acids such as lithium hydroxide, sodium hydroxide, potassium hydroxide, ammonium hydroxide, etc. So, lithium carbonate, sodium carbonate, potassium carbonate, ammonium carbonate, lithium phosphate, sodium phosphate, potassium phosphate, ammonium phosphate, lithium borate, sodium borate, potassium borate, ammonium borate, lithium acetate, acetic acid. Examples include sodium, potassium acetate, and ammonium acetate.

Furthermore, organic amine compounds include methylamine, ethylamine, dimethylamine, trimethylamine, diethylamine, triethylamine, allylamine, ethylamine,
trimethylenediamine, dipropylamine, ethanolamine, jetanolamine, triethanolamine,
2-diethylamino-1-ethanol, 2-methylamino-1-ethanol, 3-dimethylamino-1,2-propanediol, 3-diethylamino-1-propanol, 5-amino-1-pentanol, 2-dimethyl Aminoethanol, 2-ethylaminoathanol, 3-amino-1-propatol, 1-dimethylamino-2-propatol, morpholine, etc. can be mentioned.

Chelating agents or alkaline salts of chelating agents include N-dihydroxyethylglycine, iminodiacetic acid, nitrilotriacetic acid, N-hydroxyethyliminodiacetic acid, ethylenediaminetetraacetic acid, N,N"-ethylenediaminediacetic acid, N-hydroxyethylethylenediaminetriacetic acid, Acetic acid, diethylenetetraaminepentaacetic acid, 1,2-cyclohexanediaminetetraacetic acid, trimethylenediaminetetraacetic acid, ethylene glycol diethyl ether diamine tetraacetic acid, ethylenediaminetetrapropionic acid, ethylenediaminedipropionediacetic acid, β-7minoethyl phosphonic acid Representative examples include N,N-diacetic acid, aminomethylphosphonic N,N-diacetic acid and its salts, 1-hydroxyethylidene-1'', and l-diphosphonic acid (salts thereof).
It is possible to produce organic phosphonic acids.

Although the substances used in the present invention have been described above, the present invention is not limited thereto.

The pH of the neutralizing solution is 10 or more, preferably 12 or more, and the concentration of the alkaline agent may be any concentration that neutralizes the solution containing the cerium compound used in the photographic processing step. Further, the amount of the chelating agent may be at least the same molar amount, preferably at least 4 times the molar amount of the cerium compound.

EXAMPLES Hereinafter, the present invention will be explained in detail with reference to Examples, but the present invention is not limited thereto.

Example-1 As a reducing liquid using a cerium compound, JP-A-51-
The halftone dot image was reduced in intensity using Example Prescription No. 002 of the specification of No. 140733, and then neutralized. The reducing fluid used had the following composition.

Ceric ammonium sulfate 30g Concentrated sulfuric acid 15g Add water IIL This reducing fluid 11 was neutralized using the neutralizing fluid shown in Table 1.

The results are as shown in Table 1, and the color of the reducing solution changes from orange to orange and becomes more yellow, and at the same time, the point at which insoluble matter is dissolved is p) I, which can be discarded. That is, discoloration of the reducing fluid and dissolution of insoluble matter are indicators for disposal.

Example 2 After processing black and white paper using an automatic processor, insoluble matter adhered to the developing tank of the automatic processor. After draining the developer used for processing, a cleaning solution using a cerium compound was used. An automatic developing machine was cleaned using the cleaning solution described in the example of JP-A-50-23229. The composition of the cleaning solution used is as follows.

22 g of ceric sulfate, 16 g of concentrated sulfuric acid, and 16 g of water were added. 11 After use, a sample of the cleaning solution was taken and neutralized with the neutralizing solution shown in Table 2.

The results are as shown in Table 2, and the color of the used cleaning solution changes from orange-yellow to yellow, and at the same time, the pH at which insoluble matter is dissolved is the point at which it can be discarded. That is.

Discoloration and dissolution of insoluble matter in the used cleaning solution are indications for disposal.

Example 3 One volume of the reducing solution used in Example 1 was neutralized with the neutralizing solution shown in Table 3.

The results are shown in Table 3, where the point at which the insoluble matter in the reducing fluid dissolves becomes the pH at which it can be discarded, and the dissolution of the insoluble matter in the reducing fluid becomes the indication point for disposal.

Example 4 For comparison, when the cleaning solution used in Example 2 was neutralized with sodium hydroxide, a large amount of insoluble matter was generated and could not be disposed of as it was.

Table 1 Table 2 Table 3 Patent applicant: Chugai Photo Pharmaceutical Co., Ltd.

Claims (3)

[Claims] (1) In a method for discarding a solution containing a cerium compound used in a photographic processing process, an alkali salt of a chelating agent or a neutralizing solution containing a chelating agent is added to a solution containing a cerium compound to prevent discoloration and/or to dissolve insoluble matter. A method of processing photographic waste liquid that is disposed of by pH. (2) A patent claim in which the neutralizing liquid uses an alkali metal and ammonium hydroxide, an alkali metal salt or ammonium salt of a weak acid, an organic substance whose aqueous solution is alkaline, a chelating agent, an alkali salt of a chelating agent, or two or more of these. A method for treating photographic waste liquid according to item 1. (3) The method for treating photographic waste liquid according to claim 1 or 2, wherein the amount of the chelating agent or the alkali salt of the chelating agent is equal to or more than the same molar amount as the cerium compound.