JPH06130570A - Method for purifying waste photographic developer - Google Patents

Abstract

PURPOSE:To easily purify a waste developer to the quality fulfilling the waste water quality standard by flocculating and removing the contaminant with various chemicals and electrolytically oxidizing/reducing the treated water. CONSTITUTION:This treating device consists of one reaction tank 1, one sludge filtering tank 2 and one treated water tank 3. One to three kinds among a melamine-formalin resin colloid, aq. aluminum sulfate, aq. aluminum polychloride, aq. ferric polysulfate, aq. sodium hydroxide, fine-powder activated carbon suspension, anionic high molecular flocculant and nonionic high molecular flocculant are selected in accordance with the kind of developer and treating stage and used in specified amts. The primarily, secondarily and tertiarily treated developer and the developer not treated with liq. chemicals are electrolytically oxidized/reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cleaning treatment of a developing solution for photographic films. Currently, photographic developers are classified into several types, but all of them contain various chemicals and metals in a rich and concentrated manner, and it is said that their purification processing is extremely difficult, and now they are treated as special industrial waste. Ocean dumping is carried out based on international agreements. However, since 1995, this ocean dumping has been banned, so the development of a treatment method for making it pollution-free is an urgent issue. It is estimated that there are tens of thousands of places where development waste liquids are generated in Japan, such as photo development companies in Ichii, hospital X-ray development sites, offset printing development sites, etc., and all development waste liquids generated in these places are industrial waste companies. The current situation is that they have been dumped and dumped at sea.

[0002]

2. Description of the Related Art Conventionally, as a method for treating this waste liquid, there has been a technique for extracting silver in the waste liquid, but at present, it is hardly used for economic reasons. In addition, a method of distilling and concentrating the waste liquid and then incineration by drying has been attempted in recent years, but still,
The reality is that it has hardly been put to practical use. The reason why the development of the purification treatment means to be seen is still delayed is that all of these developers have extremely complicated contents containing a large amount of various chemicals and metals.
This is because it was placed outside the conventional wastewater treatment technology as a very special industrial waste liquid.

[0003]

The problems to be solved by the present invention are summarized in two points. (1) Purify the waste effluent so that it meets the river discharge standards. (2) The treatment method is relatively easy, requires no special technician, and does not use particularly dangerous chemicals.

[0004]

[Means for Solving the Problems]

(1) The types of chemicals used are as follows. Melamine formalin resin colloid Aluminum sulfate solution Poly aluminum chloride solution Poly ferric sulfate solution Disodium phosphate, sodium phosphate solution Sodium hydroxide solution Fine powder activated carbon suspension Anion polymer flocculant Nonion polymer flocculant 9 types above The chemicals are selected from one to three types depending on the type of developing solution and each processing step. (2) Although the amount of chemicals used is not constant, the amount of chemicals used is approximately 10 to 100 times higher than the level of conventional wastewater treatment technology. (3) The treatment is performed for each of the waste liquids in the order of the first treatment and the second treatment, and the third treatment is further performed if necessary. (4) All of the above-mentioned steps are performed in the same device.

[0005]

The function of the present processing method is the following two functions. One is the action of removing and removing extremely strong contaminants by the action of the above-mentioned various chemicals, and the other is the action of removing by adsorption in combination with activated carbon.

[0006]

【Example】

 (1) One example of the first treatment process (a) Addition amount to 100 liters of raw water (concentrated black turbid liquid) Melamine resin colloidal solution (10%) 10 liters Polymer flocculant (anion) (0.1%) 5 liters (B) Primary treated water (transparent to light brown) (2) Example of secondary treatment process (a) Addition amount to 100 l of primary treated water (brown turbidity) Polyaluminum chloride (10%) 3 l Phosphoric acid 2 Sodium (10%) 4l Polymeric flocculant (0.1%) 2l Fine powder activated carbon (20%) 25l (b) Secondary treated water (transparent pale yellow) (3) One example of the third treatment step (a) ) Addition amount to 100l of secondary treated water (yellow green) Aluminum sulfate (10%) 2l Disodium phosphate (10%) 3l Fine powder activated carbon (20%) 20l (b) Third treated water (colorless transparent)

[0007]

【The invention's effect】

(1) The dark black red contaminated developer may be a slightly yellow transparent or colorless transparent liquid, and the water quality may be below the reference value for each item. (2) The treated water is treated in a treatment device having a simple structure (see the drawing), and the required time is about 10 minutes for the two-step treatment and about 15 minutes for the three-step treatment. (3) The flow of the stock solution and the addition of the chemicals are all performed by automatic control, and the work that requires manpower is extremely small.

[Brief description of drawings]

 FIG. 1 is a structural diagram of a processing device.

[Explanation of symbols]

1 Reaction Tank 2 Sludge Tank 3 Treated Water Tank 4 Stirrer 5 Sludge Filter 6 Flow Pump 7 Chemical Tank 8 Chemical Tank 9 Chemical Tank 10 Chemical Tank 11 Chemical Tank 12
Pedestal scaffolding

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[Procedure amendment]

[Submission date] August 16, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] Full text

[Correction method] Change

[Correction content]

[Document name] Statement

Title: Method for purifying photographic developer waste liquid

[Claims]

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cleaning treatment of a developing solution for photographic films. Currently, photographic developers are classified into several types, but all of them contain various chemicals and metals in a rich and concentrated manner, and it is said that their purification processing is extremely difficult, and now they are treated as special industrial waste. Ocean dumping is carried out based on international agreements. However, since 1995, this ocean dumping has been banned, so the development of a treatment method for making it pollution-free is an urgent issue. It is estimated that there are tens of thousands of places where development waste liquids are generated in Japan, such as photo development companies in Ichii, hospital X-ray development sites, and offset printing development sites, and all the development waste liquids generated in these places are industrial waste companies. The current situation is that they have been dumped and dumped at sea.

[0002]

2. Description of the Related Art Conventionally, as a method for treating this waste liquid, there has been a technique for extracting silver in the waste liquid, but at present, it is hardly used for economic reasons. In addition, a method of distilling and concentrating the waste liquid and then incineration by drying has been attempted in recent years, but still,
The reality is that it has hardly been put to practical use. The reason why the development of the purification treatment means to be seen is still delayed is that all of these developers have extremely complicated contents containing a large amount of various chemicals and metals.
This is because it was placed outside the conventional wastewater treatment technology as a very special industrial waste liquid.

[0003]

The problems to be solved by the present invention are summarized in two points. (1) Purify the waste effluent so that it meets the river discharge standards. (2) The treatment method is relatively easy, requires no special technician, and does not use particularly dangerous chemicals.

[0004]

[Means for Solving the Problems] (1) The types of chemicals used are as follows. Melamine formalin resin colloid Aluminum sulfate solution Poly aluminum chloride solution Poly ferric sulfate solution Disodium phosphate, sodium phosphate solution Sodium hydroxide solution Fine powder activated carbon suspension Anion polymer flocculant Nonion polymer flocculant 9 types above The chemicals are selected from one to three types depending on the type of developing solution and each processing step. (2) Treatment of each waste liquid is performed in the order of the primary treatment and the secondary treatment, and if necessary, the tertiary treatment is further performed. (3) For the developer after the first treatment or after the second and third treatments and the developer not subjected to the chemical treatment,
The solution is electrolyzed to oxidize / reduce the processing solution. The amount of electricity and the operating time required for this treatment are determined by the degree of contamination of the treated water. (4) The above-mentioned steps are all performed in the same apparatus except for special cases.

[0005]

[Function] The function of the present processing method is mainly described in the following 2
Is one. One is an action of aggregating and removing contaminants performed by the action of the above-mentioned various chemical solutions, and the other is an action of oxidation / reduction by electrolysis of treated water.

[0006]

Examples (1) One example of the first treatment step (a) Addition amount to 100 g of raw water (thick black turbid liquid) Melamine resin colloid liquid (10%) 10 l Polymer flocculant (anion) (0. 1%) 5l (b) Primary treated water (light brown transparent) (2) Example of secondary treatment process (a) Addition amount to 100 g of primary treated water (brown slightly turbid) Polyaluminum chloride (10% ) 3l Disodium phosphate (10%) 4l Polymer flocculant (0.1%) 2l Fine powder activated carbon 10l (b) Secondary treated water (pale yellow transparent) (3) One example of electrolysis treatment step (a) Electrodes (0.2 dm25 anode plate, 0.25 dm26 cathode plate) provided at the bottom of the reaction tank for the secondary treated water.
By passing a direct current with a voltage of about 20 V and a current of about 30 A to each sheet, the electrolysis is performed and the electrolysis is continued until the initial target value is reached. (Generally 30 minutes to 2 hours) (b) Third-order treated water (colorless and transparent)

[0007]

EFFECTS OF THE INVENTION (1) The quality of treated water can be kept below a reference value. (2) The processing is performed in a processing device having a simple structure (see the drawing), and the required time is about 1 in the case of two-step processing.
0 minutes, about 2 hours in the case of electrolysis. (3) The flow of the stock solution and the addition of the chemicals are all performed by automatic control, and the work that requires manpower is extremely small.

[Brief description of drawings]

FIG. 1 is a structural diagram of a processing device.

[Explanation of symbols] 1 reaction tank 2 sludge tank 3 treated water tank 4 stirrer 5 sludge filter 6 flow pump 7 chemical tank 8 chemical tank 9 chemical tank 10 chemical tank 11 chemical tank 12
Pedestal scaffolding

[Procedure Amendment 2]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

[Figure 1]

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location C02F 9/00 ZAB 7446-4D

Claims (3)

[Claims] 1. A melamine formalin resin colloid, a polyaluminum chloride solution, an aluminum sulfate solution, a polyferric acid ferric acid solution, a sodium phosphate solution, a sodium hydroxide solution, an activated carbon fine powder, an anionic polymer flocculant, and nonion for the photographic development waste solution. One to three types of macromolecular flocculants are added, and the amount of addition is approximately 50% of the water content of the target treated water.
In case of ppm or more, the pure content ratio is 1000ppm
As described above, in the case of, a pure content ratio of 500 ppm or more, in the case of, a pure content ratio of 10,000 ppm or more, and in the case of a pure content ratio of 20 ppm or more, a coagulation action is carried out, and a developing waste liquid treatment method is characterized. 2. A method of processing a photographic waste liquid, wherein the waste liquid is processed in the order of a first processing step, a second processing step to a third processing step, and each processing step is carried out in the same apparatus. 3. A photographic waste liquid processing apparatus comprising one reaction tank, one sludge filtration tank and one processing water tank, wherein the processing water is circulated in this order. Construction