JPH04322798A - Treatment of waste processing solution - Google Patents

Abstract

PURPOSE:To reduce the cost of discharging the surplus and to reutilize the waste heat by adding a flocculant to a waste processing soln. to separate the soln. into the precipitate and supernatant liq. and utilizing the heated gas generated when a solvent used in heating the supernatant liq. is vaporized, air-cooled and liquefied to dry the precipitate. CONSTITUTION:The floc in a waste soln. in a flocculation tank 2 flocculated by addition of a flocculant is separated from the supernatant liq., and the precipitate is dropped into an evaporating dish 6. The supernatant liq. is sent to an evaporator 20 and heated, the vapor is sent to an air cooler 30, and the condensate is accumulated in a liq. receiver 40. The air used in the cooler 30 and heated to a high temp. is injected into the dish 6 from a tiny hole 32a, and the precipitate is heated. The evaporation from the precipitate is accelerated by the air from an air suction port 10 in the upper space of the dish 6, and the precipitate is dried. Consequently, the surplus (flocculated precipitate and concentrate) is discarded at a lower cost, and the waste heat is reutilized.

Description

[Detailed description of the invention]

0001

[Field of Industrial Application] The present invention relates to a method for treating processing waste liquid generated in the processing of non-silver salt photosensitive materials, and more specifically, to a method for separating processing waste liquid into solid content and recovered liquid by an evaporation method. Regarding technology to reduce

0002

[Prior Art] The processing process of a non-silver salt photosensitive material, such as a photosensitive lithographic printing plate, using an automatic developing machine includes a development process in which the image forming layer is eluted in an imagewise manner, and, if necessary, washing water and a desensitizing liquid. , rinsing liquid, surface conditioning liquid, etc. When processing a large amount of photosensitive material,
A method is used to replenish the components consumed during processing, and to maintain the processing solution components at a constant level by removing components that are eluted into the processing solution or concentrated by evaporation during processing. A replenisher is added to the processing solution, and a portion of the processing solution is disposed of to remove the concentrated components, or all of the processing solution is disposed of if the processing solution performance falls outside of acceptable limits. .

[0003] By the way, due to the recent tightening of pollution control by the Water Pollution Control Law and each prefectural ordinance, it is possible to dispose of such waste liquid by disposing of flush water or cooling water into the sewer system. It has become virtually impossible to dispose of waste liquids (for example, waste liquids such as developer solution, gum solution, rinse solution, etc.). For this reason, photo processing companies either pay a collection fee to a waste liquid processing company to collect the waste liquid, or they install pollution treatment equipment. However, the method of outsourcing wastewater treatment to a wastewater treatment company requires a considerable amount of space to store the wastewater, and is also extremely expensive.Furthermore, the initial investment for pollution treatment equipment is extremely large, and it is difficult to maintain it. It has problems such as requiring a fairly large space.

[0004] As a technique for solving such problems, some of the inventors of the present invention have developed a method of heating and concentrating the treated waste liquid in an evaporator, cooling and condensing the evaporated liquid component, and separating it into a concentrate and a liquid component. technology for reusing liquid components and reducing waste in the form of concentrates (for example, Japanese Patent Application Laid-Open No. 1-304463
In order to reduce the sticky concentrate in the evaporator, the treated waste liquid is neutralized before entering the evaporator, a condensing agent is added to condense the condensed components, and the supernatant liquid is transferred to the evaporator. He proposed a technology for transmitting data (Japanese Patent Application No. 1983-217403). Furthermore, when implementing such technology, as a means of reducing the amount of concentrate produced in the evaporator, a condensing agent is added to the treated waste liquid to precipitate the supernatant liquid, which is then supplied to the evaporator for treatment. The precipitate was not evaporated to dryness, but the precipitate was left to be processed by a company along with the concentrate, which was heated and concentrated in an evaporator.

[0005]

[Problems to be Solved by the Invention] However, the above-mentioned method of treating waste liquid has the problem of high long-term costs and the problem that the waste heat discharged during the treatment is not utilized.

[0006] Therefore, the object of the present invention is to precipitate the treated waste liquid with a flocculant to separate it into a precipitate and a supernatant liquid, and to separate the supernatant liquid into a concentrate and a liquid component by an evaporation method. An object of the present invention is to provide a treatment method that can reduce the cost required for disposing of waste (the above-mentioned precipitate and concentrate). Another object of the present invention is to provide a method for treating a treated waste liquid, in which the waste heat discharged in the treatment method can be reused.

[0007]

[Means for Solving the Problems] An object of the present invention is to add a flocculant to a processing waste liquid of a non-silver salt photosensitive material to separate it into a precipitate and a supernatant liquid, and to heat the supernatant liquid to remove a solvent. A method for treating a treated waste liquid, in which the treated waste liquid is evaporated, liquefied by air cooling, and separated into a solvent and a concentrate, characterized in that the precipitate is dried using heated gas generated by the air cooling. This is achieved through a processing method.

First, the present invention will be explained based on the drawings.

FIG. 1 is a block diagram showing an example of a processing apparatus used in the processing method according to the present invention. In this figure, 1
1 is a processing waste liquid tank in which processing waste liquid discharged from an automatic processor (not shown) is placed. A liquid level sensor (not shown) inside the processing waste liquid tank 1 detects a drop in the liquid level, and a control mechanism (not shown) detects a drop in the liquid level. It is designed to replenish waste liquid, activate an alarm device, stop the operation of processing equipment, etc.

2 is a flocculation tank which adds a flocculant to the treated waste liquid and separates it into precipitate and supernatant liquid produced by flocculation; 3 is a pump that sends the treated waste liquid from the treated waste liquid tank 1 to the flocculation tank 2. . 4 is a flocculant tank containing a flocculant to be added to the treated waste liquid in the flocculation tank 2, 4a is a solenoid valve, 5 is a stirrer, 5a is a motor, and 6 is a flocculant for flocculating the precipitate that is flocculated by adding the flocculant. an evaporation dish that is drained from the tank 2 and placed therein and heated to evaporate the liquid component; 6a is an opening/closing door for taking out the precipitate; 7 is a discharge valve provided in the pipe between the flocculation tank 2 and the evaporation dish 6; is a heater that heats the evaporating dish 6, and is configured so that high-temperature air heated by an air cooler, which will be described later, is blown onto the evaporating dish 6 from here. 9 is a pipe connecting the evaporating dish 6 and the evaporating pot 20, and 10 is an air intake port provided in the evaporating dish 6. It is preferable that the evaporating dish 6 is provided with a gas inlet and a door for discharging the precipitate as described above. 11 is a liquid level sensor that detects the liquid level of the treated waste liquid in the flocculation tank 2, and is configured to detect whether the liquid level is within a predetermined liquid level range, high outside the range, or low outside the range. There is.

The signal from the liquid level sensor 11 is input to a control circuit (not shown), and the pump 3, solenoid valve 4a and motor 5
It is configured to control the operation of a. That is, when the liquid level detected by the liquid level sensor 11 is lower than the lower limit of a predetermined range, the pump 3 is activated, and when it is higher than the upper limit of the predetermined range, the operation is stopped. The solenoid valve 4a is controlled to open for a predetermined time and the motor 5a rotates for a predetermined time.

The evaporation tank 20 is a tank for heating and concentrating the supernatant liquid sent from the aggregation tank 2, and the reference numeral 21 is a solenoid valve provided in a pipe line 22 connecting the aggregation tank 2 and the evaporation tank 20. 23 is a float,
Thereby, the depth from the liquid level of the opening in the flocculation tank 2 of the pipe line 22 into which the supernatant liquid enters can be maintained constant, and the supernatant liquid can be effectively suctioned. 24 is provided between the supply chamber 2a for supplying the supernatant liquid to the evaporation pot 20 in the flocculation tank 2 and the flocculation chamber 2b for performing flocculation, to prevent the precipitate generated in the flocculation chamber 2b from entering the supply chamber 2a. It is a net-like filter for blocking.

In the evaporating pot 20, reference numeral 25 denotes a heating member that generates heat when energized to heat the supernatant liquid.
It has a helical heating section suspended from the top. 26 is a liquid level detection unit that detects the liquid level of the treated waste liquid in the evaporation pot 20. The liquid level detection section 26 includes a communication pipe 27 provided outside the side wall of the evaporating pot 20 and a liquid level sensor (not shown) provided within the communication pipe 27. The signal detected by the liquid level detection unit 26 is input to a control mechanism (not shown) to control the opening and closing of the electromagnetic valve 21, thereby controlling the flow from the coagulation tank 2 to the evaporation pot 2.
The flow of the supernatant into the evaporator 20 is controlled so that the liquid level within the evaporator 20 is maintained within a certain range. 30 is an air cooler that cools and condenses the vapor evaporated from the supernatant liquid in the evaporator 20 and sent through the pipe, and 31 is an air cooling fan. 32 is a duct that sends air heated by heat exchange in the air cooler 30 to the evaporating dish 8, and 33 is a blowing pump. 35
36 is a sludge tank for storing the concentrate (sludge) produced by concentrating the supernatant liquid in the evaporator 20, and 36 is a discharge valve (preferably a butterfly valve) provided in the pipe between the evaporator 20 and the sludge tank 35. ). 40 is a liquid receiver that stores the liquid condensed in the air cooler 30, 41 is a liquid sending pump that sends the recovered liquid in the liquid receiver 40 to the recovery tank 42, and 43 is the evaporation pot 20.
This is an exhaust pump for reducing the pressure inside the evaporator and sucking the vapor evaporated in the evaporator 20 into the air cooler 30. In the liquid receiver 40, when a liquid level sensor (not shown) detects the liquid level, a liquid sending pump 41 is operated for a certain period of time by a control mechanism (not shown) to send a predetermined amount of liquid to a recovery tank 42. 44 is a deodorizer containing a deodorizer.

FIG. 2(a) is a perspective view of the heater 8. The heater 8 consists of a hollow box body with a large number of pores 32a provided on the surface facing the evaporating dish 6 through which air heated by an air cooler 30 and guided by a duct 32 is injected into the evaporating dish 6. Second
Figure (B) is a sectional view taken along the line AA in Figure 2 (A), and 32b is a partition wall that guides the flow of air from the duct 32 to the pores 32a. Air from the duct 32 is guided by a large number of partition walls 32b and ejected from pores 32a located at the center upper surface of each partition wall.

FIG. 3 is a schematic configuration diagram for explaining the control relationship of the apparatus shown in FIG. 1. In this figure, the same components as in FIG. 1 are given the same reference numerals, and redundant explanation will be omitted. Reference numeral 50 indicates a control circuit for controlling the coagulation treatment of treated waste liquid using a coagulant, and reference numeral 51 indicates a control circuit for controlling the liquid level inside the evaporation pot 20. The control circuit 50 is
Based on the signal detected by the liquid level sensor 11, it is determined whether the liquid level is lower than the lower limit h1 of a predetermined liquid level height range or higher than the upper limit h2 of the range, and if it is lower than the lower limit h1, the pump 3
When the upper limit h2 is exceeded, the operation of the pump 3 is stopped, and the solenoid valve 4a is opened for a predetermined time from the start of operation of the pump 3, and the motor 5a, which rotates the stirrer 5 for a predetermined time, is rotated. It is composed of The control circuit 51 is configured to close the solenoid valve 21 when the liquid level detected by the liquid level detecting section 26 of the evaporating pot 20 is higher than a predetermined range, and to open the solenoid valve 21 when it is lower than the predetermined range.

Next, the method of the present invention will be explained with reference to FIGS. 1 to 3. A processing waste liquid discharged from a processing apparatus for non-silver salt photosensitive materials and placed in a processing waste liquid tank 1 is sent to a coagulation tank 2 by a pump 3. The pump 3 is activated when the liquid level in the coagulation tank 2 is lower than the lower limit h1 of a predetermined liquid level height range, and stops when the liquid level is higher than the upper limit h2. As a result, the liquid level in the flocculation tank 2 is approximately h1 to h
2. On the other hand, when the pump 3 is operated, the stirrer 5 rotates for a predetermined period of time, and the electromagnetic valve 4a is opened for a predetermined period of time required to add the required amount of flocculant, and flocculant is added from the flocculant tank 4. By adding the flocculant, the flocculating components in the treated waste liquid in the flocculating tank 2 are flocculated and precipitated, and separated from the supernatant liquid. The supernatant liquid is sucked and flows into the evaporator 20 under reduced pressure conditions, but at this time, the filter 24 prevents the sediment from moving into the evaporator 20 . The precipitate is transferred to the evaporating dish 6 by opening the discharge valve 7 at any time.

The supernatant liquid separated in the flocculating tank 2 by adding a flocculant is supplied to the evaporating tank 20 from the supply chamber 2a. Since the pressure inside the evaporation pot 20 is reduced by the operation of the exhaust pump 43, the air is sucked into the evaporation pot 20 by opening the solenoid valve 21. The opening and closing of the electromagnetic valve 21 is controlled as described above, and the flow of the treated waste liquid from the coagulation tank 2 into the evaporation pot 20 is controlled, so that the liquid level in the evaporation pot 20 is maintained within a certain range. Note that the pressure conditions inside the evaporator 20 are as follows:
It is appropriate that the pressure in the upper cavity within 0 is in the range of 40 to 70 cmHg, more preferably 40 to 65 cmHg.
It is in the range of mHg.

The treated waste liquid sent to the evaporator 20 is heated by a heating member 25 that generates heat when energized, and the evaporated vapor is sent from the upper part of the evaporator 20 to an air cooler 30, where it is air-cooled and condensed. The gas that does not condense is stored in the receiver 40, and the gas that does not condense is deodorized by the deodorizer 44 and exhausted to the outside by the exhaust pump 43. The liquid stored in the liquid receiver 40 is pumped to the pump 41.
and sent to the recovery tank 42. Further, the concentrate (sludge) generated in the evaporator pot 20 is stored in the sludge tank 35 by opening the discharge valve 36.

In the air cooler 30, high-temperature steam from the evaporator pot 20 is cooled and condensed in a pipe by air cooling, and the heated high-temperature air used for this cooling is passed through a duct 32 and a blower pump 33 to a heater 8. The liquid is introduced into the evaporating dish 6 through the pores 32a, and the bottom surface of the evaporating dish 6 is heated. As a result, the precipitate deposited on the bottom surface of the evaporating dish 6 is heated. In the evaporating dish 6, the upper space of the precipitate enters through the air inlet 10 and is sucked through the pipe 9 into the evaporating pot 20 under reduced pressure conditions, creating a flow of air. Evaporation is accelerated and drying occurs. The dried precipitate is scraped out and discharged by opening the opening/closing door 6a.

In the present invention, the flocculants include inorganic flocculants such as ferrous sulfate, ferrous chloride, ferric sulfate, calcium sulfate, aluminum sulfate, polyaluminum chloride, and magnesium sulfate, polyacrylamide, and polyethylene. imine, polyacrylic acid, polyethylene oxide,
Organic flocculants such as polyamines and polyacrylamide-based polymer compounds can be preferably used. The flocculant can be used in accordance with known methods.

[0021] The pH of the treated waste liquid to which the flocculant is added is 5 to 9.
If the pH is outside the range, it is preferable to adjust the pH by the method described in Japanese Patent Application No. 63-217403.

[0022] The treated waste liquid to which the present invention is applied includes the following. Namely, there are photosensitive materials that have a negative photosensitive layer using a diazo compound as a photosensitive substance, photosensitive materials that have a positive photosensitive layer that uses an o-quinonediazide compound as a photosensitive substance, and photosensitive materials that use a photopolymer as a photosensitive substance. The material is treated with a respective processing solution, such as a developer,
Processed waste liquid treated with washing water, rinsing liquid, desensitizing treatment liquid, etc.

[0023] More specifically, for example, Japanese Patent Laid-Open No. 62-17
No. 5757, No. 62-24263, No. 62-2426
No. 4, No. 62-25761, No. 62-35351,
No. 62-73271, No. 62-75535, No. 62
-89060, 62-125357, 62-1
No. 33460, No. 62-159148, No. 62-16
No. 8160, No. 62-175757, No. 62-175
No. 758, No. 62-238565, No. 63-1881
No. 41, No. 63-200154, No. 63-20565
8 and JP-A-1-159654, waste liquid of a developer generated by the combination of a photosensitive lithographic printing plate and a developer.

For example, as described in JP-A-1-149043, JP-A-1-150142, JP-A-1-154157, and JP-A-1-154158, silicone is used as a photosensitive layer and an ink repellent layer on a substrate. Waste liquid of a developer generated by a combination of a photosensitive material having a layered structure and its developer.

For example, the treatment waste liquid of the rinse solution described in JP-A-62-58253, JP-A-62-5825
Processed waste liquid of desensitizing liquid, etc. described in Publication No. 5.

[0026]

EXAMPLE A treated waste liquid was treated using the treatment apparatus shown in FIG.

[0027] The processing waste liquid is processed using an automatic processor PSU-820 (
Konica Corporation), and the developing solution was a developer waste discharged from a development process using SD-32 (common negative/positive developer, manufactured by Konica Corporation). The components contained in developer waste include phenol resin, acrylic resin, aluminum,
These include potassium silicate, nonionic surfactants, anionic surfactants, pigments, alcoholic solvents, and organic amines.

The above-mentioned treated waste liquid was treated in a 30 liter treatment apparatus shown in FIG. A nichrome wire heater is used as the heating member 25, the power supplied is 1.0W, and the pressure inside the evaporation pot 20 is set to 4.
1 cmHg, and the rotation speed of the agitator 5 in the flocculation tank 2 was 60 rpm.
And so. Further, the liquid capacity of the coagulation tank 2 was 5 liters, and the liquid capacity of the evaporation pot 20 was 9 liters. When processing under these conditions,
The amount of precipitate generated by the addition of the flocculant in the flocculating tank 2 was approximately 60% of the amount of treated waste liquid (5 liters), and was approximately 3 kg. The solidified precipitate dried in the evaporating dish 6 can be incinerated as a combustible material, and the contractor's collection cost will be reduced by 3 liters for every 5 liters of treated waste liquid.

Comparative Example When the treatment was carried out using a conventional waste liquid treatment device that does not utilize the exhaust heat of the air cooler, the precipitate 3 generated by the addition of flocculant in the flocculation tank
kg contains water and must be picked up by a contractor, so the contractor will have to pay for the collection fee.

[0030]

[Effects of the Invention] According to the present invention, processing waste liquid of non-silver salt photosensitive materials is precipitated with a flocculant and separated into a precipitate and a supernatant liquid,
In a treatment method in which supernatant liquid is separated into concentrate and liquid components by evaporation, waste (precipitate and concentrate due to flocculant)
The cost required for disposal can be reduced, and the waste heat discharged in such a treatment method for treated waste liquid can be reused.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram showing the configuration of an example of an apparatus used in the method of the present invention, FIG. 2(A) is a perspective view of a modified example of the heater 8 in FIG. 1, and FIG. The sectional view and FIG. 3 are schematic diagrams of the control relationship of the apparatus shown in FIG. 1.

[Explanation of symbols]

1. Processing waste liquid tank 2.Flocculation tank ４‥Flocculant tank 6. Evaporating dish 8. Heater 20‥Evaporating pot 30‥Air cooler 32. Duct 35‥Sludge tank

Claims (1)

[Claims] Claim 1: A flocculant is added to the processing waste liquid of non-silver salt photosensitive materials to separate the precipitate and the supernatant liquid, and the supernatant liquid is heated to evaporate the solvent and air cooled to liquefy the solvent. A method for treating a treated waste liquid that is separated into a concentrate, the method comprising drying the precipitate using heated gas generated by the air cooling.