JPH04298741A - Processing method and processing device for waste processing liquid of non-silver salt photosensitive material - Google Patents

Abstract

PURPOSE:To facilitate a solid-liquid sepn. in an operation to separate flocs and liquid by adding a neutralizing agent and flocculating agent to a waste processing liquid of non-silver salt photosensitive materials to flocculate this liquid and to allow the long-term use of a solid-liquid separator without exchanging filters as well as to improve the workability of the solid-liquid operation. CONSTITUTION:The neutralizing agent and flocculating agent are added to the waste processing liquid of the non-silver salt photosensitive materials and thereafter, a solid-liquid mixture contg. the flocs is supplied to the peripheral surface of a filter member 11 of a hollow cylindrical type, the peripheral surface of which is constituted of filter media. The pressure in the filter member 11 is then reduced to filter the liquid. The filtrate in the filter member 11 is sucked and discharged to the outside. The filter member 11 is rotated and the solid sticking to the surface of the filter media is scraped by a doctor 17, by which the above-mentioned waste liquid is separated to the solid and the liquid.

Description

[Detailed description of the invention]

0001

[Field of Industrial Application] The present invention relates to a method and apparatus for treating processing waste liquid (hereinafter referred to as "processing waste liquid") generated in the development processing of non-silver salt photosensitive materials, and more specifically, to a treatment method and apparatus for processing waste liquid produced in the development processing of non-silver salt photosensitive materials. This invention relates to improvements in solid-liquid separation means in technology for solid-liquid separation by addition.

0002

[Prior Art] As a method for processing waste liquid from non-silver salt photosensitive materials, such as photosensitive lithographic printing plates that use diazo compounds or o-quinone diazide compounds as photosensitive components, a method for treating waste liquid from processing involves having a waste liquid treatment company take over the processing waste liquid. Conventionally, waste liquid treatment facilities have been installed to treat the waste liquid, but these methods have problems in terms of workability and cost.

[0003] In order to improve this problem, a method has been proposed in which the treated waste liquid is heated and concentrated under reduced pressure in an evaporator to separate it into water and solids (Japanese Utility Model Publication No. 70841/1983). However, since the processing waste liquid of non-silver salt photosensitive materials often contains large amounts of polymer compounds, sticky sludge adheres to the heating member and the heat concentration pot (evaporation pot) during the heat concentration process. There are problems with stability and difficulty in discharging sludge.

[0004] In order to solve this problem, some of the inventors of the present invention proposed a method in which a flocculant is added to the treated waste liquid to cause flocculation before heating and concentrating, and the flocs are removed with a filter before being treated in a heated concentrator. (Japanese Patent Application Laid-Open No. 2157084).

[0005]

[Problems to be Solved by the Invention] However, if the cylindrical filter described in the above method is used as a specific filter means, it is necessary to replace the filter frequently, and it is difficult to remove attached aggregates from the filter. Since it is difficult to replace the filter, the filter has to be thrown away, and the replacement work of the filter is troublesome.

Therefore, an object of the present invention is to provide an easy solid-liquid separation operation for a solid-liquid mixture obtained by adding a flocculant to the processing waste liquid of non-silver salt photosensitive materials and coagulating the solid-liquid mixture. It is an object of the present invention to provide a method and an apparatus in which a solid-liquid separator can operate for a long period of time without troublesome work such as replacing filters, and in which the workability of solid-liquid separation operations is improved.

[0007]

[Means for Solving the Problems] The method of the present invention for achieving the above-mentioned object is to apply flocculation treatment to the processing waste liquid of non-silver salt photosensitive materials, and then transfer the solid-liquid mixture containing the flocculates to a filter material with the surrounding surface The filtrate is supplied to the circumferential surface of a hollow cylindrical filtration member formed by the method, the inside of the filtration member is filtered by reducing the pressure, the filtrate inside the filtration member is sucked and discharged to the outside of the filtration member, and the filtrate is sucked out of the filtration member. The apparatus of the present invention is characterized in that the filter member is rotated to scrape off solids adhering to the surface of the filter medium and separate the solids and the filtrate. a filtration member rotatable about the axis of the hollow cylinder as a rotation axis;
means for rotating the filtering member about the axis of rotation; means for reducing the pressure inside the filtering member; means for supplying the solid-liquid mixture to be filtered to the peripheral surface of the filtering member; It is characterized by having means for suctioning and discharging outside the filtering member, and means for scraping off deposits on the circumferential surface of the filtering member.

The present invention will be explained in detail below. The flocculation treatment in the present invention is a treatment in which the treated waste liquid is neutralized if necessary for flocculation, and a flocculant is added to flocculate the polymer components. When using acids as neutralizing agents for treated wastewater, sulfuric acid, hydrochloric acid, phosphoric acid, oxalic acid, citric acid, tartaric acid, etc. are preferably used, and as alkalis, slaked lime, caustic soda, caustic potash, organic amines, etc. are preferably used. . Among these, odorless or almost odorless ones are particularly preferred. In the method of the present invention, the p of the treated waste liquid after neutralization is
It is preferable that H is 2-9. As the flocculant, aluminum sulfate, magnesium sulfate, polyaluminum chloride, calcium chloride, magnesium chloride, polyacrylamide polymer, polyacrylic acid (or salt), etc. can be preferably used. It is preferable to add the flocculant at the same time as or after the addition of the neutralizing agent.

Next, the present invention will be explained with reference to the drawings. FIG. 1 is a schematic sectional view showing an example of a treatment waste liquid treatment apparatus for carrying out the method of the present invention, including an embodiment of the treatment apparatus according to the present invention. In this figure, 1 is a processing waste liquid tank for storing processing waste liquid;
2 is a treatment tank in which a neutralizing agent (acid or alkali) and a flocculant are added to the treated waste liquid to cause flocculation (hereinafter also referred to as "chemical treatment"); 3 is a treatment tank in which a neutralizing agent (acid or alkali) and a flocculant are ) is a neutralizer tank. The number of neutralizing agent tanks may be one if the waste liquid to be treated is limited to either alkaline or acidic, but if necessary, two tanks, one for acid agents and one for alkaline agents, may be provided. 4 is a flocculant tank containing a flocculant;
5, 6, and 7 are pumps; 8 is a stirrer; 10 is a solid-liquid separator for filtering the treated waste liquid that has been chemically treated in the treatment tank 2 to become a solid-liquid mixture and separating it into solid and filtrate; 30 40 is an evaporator for heating and concentrating the filtrate separated by the solid-liquid separator 10;
50 is a condenser that condenses the steam generated in the evaporator 30;
is a liquid receiver into which the condensed liquid condensed in the condenser 50 is placed. Note that a tank may be provided between the pump 16 and the evaporator 30 to temporarily store the filtrate, and the filtrate may be sent to the evaporator 30 from there.

The above chemical treatment device measures the pH of the treated waste liquid in the treatment tank 2 using a pH measuring device and a control mechanism (not shown), and when the pH is outside a predetermined pH range, a predetermined pH value is set.
The pump 6 is operated so that the amount of neutralizing agent is within the H range, and the neutralizing agent is sent from the neutralizing agent tank 3, and the pump 7 is operated so that the amount of the neutralizing agent is sent to the processing tank 2. The neutralizing agent is configured to be delivered. The evaporator 30 is provided with a heating device 31, a means 32 for discharging the concentrate produced by heating and concentration, and a liquid level sensor 33 for controlling the liquid level within a predetermined range. The operation of the metering pump 16 is controlled so that the liquid level of the metering pump 16 is maintained within a predetermined range. 41 is a fan for cooling the condenser 40 with air.

The solid-liquid separator 10 includes a filtration member 11 whose circumferential surface of a hollow cylinder is composed of a filter medium and which is rotatable about the shaft of the hollow cylinder as a rotation axis. Supply tank 12 and processing tank 2 for supplying solid-liquid mixture
Pipe line 13 and pump 14 that send the treated waste liquid inside to the supply tank 12
, and a pipe line 1 that sucks and discharges the filtered filtrate inside the filter member 11 and reduces the pressure inside the filter member 11.
5 and the pump 16, a doctor blade 17 for scraping off aggregates adhering to the peripheral surface of the filter member 11, a sludge tank 18 for storing the scraped aggregates, and the filter member 1.
1 in the direction A in the figure. 19 is a sludge discharge means provided in the sludge tank 18. The liquid level of the treated waste liquid sent into the supply tank 12 is controlled within a predetermined range by a liquid level sensor and a control mechanism (not shown). Further, the supply tank 12 is provided with a discharge means (not shown) capable of discharging the treated waste liquid therein.

FIG. 2 is a partial perspective view of the main parts of the solid-liquid separator 10 shown in FIG. As shown in the figure, the solid-liquid separator 10 is configured to be rotatable about an axis B of the hollow cylinder of a filtration member 11 consisting of a hollow cylinder whose circumferential surface is formed of a filter medium, and the bottom of the hollow cylinder is The sides are configured to be immersed in the treated waste liquid entering the supply tank 12. The filter member 11 has a side plate 2 on the side surface of its hollow cylinder so that the inside can be depressurized.
1 is sealed. A portion 15a of the conduit 15 inside the filter member 11 is provided with a plurality of holes (not shown) through which the filtrate can pass. M is a drive motor.

FIG. 3 shows C- of the filter member 11 shown in FIG.
It is a sectional view of C. The filter member 11 has a diameter of 0 on the entire circumferential surface.
．． The filter medium 1 is the peripheral surface of a hollow cylinder 11a made of stainless steel or the like with a thin through hole (not shown) of about 5 to 200 μm.
By reducing the pressure inside the hollow cylinder 11a with a pump 16, the chemically treated waste liquid supplied to the outside of the filter medium 11b is suction-filtered. The hollow cylinder 11a is filtered by the filter medium 11b.
The filtrate sucked into the inside is sucked by a pump 16, is sucked through a plurality of holes provided in a conduit 15a, and is sent to an evaporation pot 30 through a conduit 15. Conduit 1
The filtrate suction port 5a may be configured to be located at the lower part of the inside of the hollow cylinder 11a.

Next, the method of the present invention will be explained with reference to FIGS. 1 to 3. A processing waste liquid produced in the processing of non-silver salt photosensitive materials and placed in a processing waste liquid tank 1 is sent to a processing tank 2 by a pump 5. In the treatment tank 2, the pH is measured by a pH measuring device (not shown). If the pH is outside a predetermined range, the pump 6 is activated and the neutralizer in the neutralizer tank 3 is pumped until the pH falls within a predetermined range. is sent to processing tank 2. Next, an amount of flocculant corresponding to the amount of treated waste liquid sent is sent from the flocculant tank 4 by a pump 7. When feeding the neutralizing agent and flocculant to the processing tank 2, the stirrer 8 is operated to stir them. The treated waste liquid, which has become a solid-liquid mixture due to the formation of aggregates through chemical treatment, is sent to the supply tank 12 of the solid-liquid separator 10 by a pump 14 .

In the solid-liquid separator 10, the pressure inside the filter member 11 is reduced by the operation of the pump 16, and the treated waste liquid in the supply tank 12 is filtered by the filter medium 11b, and the filtrate is transferred to the hollow cylinder 1.
On the other hand, solid matter (sludge) adheres to the surface of the filter medium 11b, that is, the circumferential surface of the filter member 11, and is scraped off by the doctor blade 17 as the filter member 11 rotates in the direction of arrow A. , is accommodated in the sludge tank 18.

On the other hand, the filtrate in the hollow cylinder 11a is pumped through the pump 1.
6, the liquid is sucked through the pipe line 15a, enters the evaporation pot 30, is heated by the heating member 31, evaporates, is condensed in the condenser 40, and is stored in the receiver 50. The concentrate of the filtrate concentrated within the evaporator 30 is discharged to the outside of the evaporator 30 by a discharge means 32.

In the present invention, a porous material made of polyvinyl alcohol and phenol resin can be preferably used as the filter material used in the solid-liquid separator, and the pore diameter of the porous material is about 5 to 10 μm. The thickness of is 1~2
0 cm is preferable. The degree of vacuum in suction filtration is -720
mHg or less is preferable, and the number of rotations of the rotating filter member is 1
The speed is preferably 7 rpm or less. Further, it is preferable that the amount of replenishment of the chemically treated waste liquid to the solid-liquid separator is about 6 l/min, and the viscosity of the object to be solid-liquid separated in the solid-liquid separator is 300 cps or less.

[0018] Chemical treatment method and apparatus in the present invention, method and apparatus after heating concentration (evaporation pot (heating concentration pot)
For others, known techniques can be applied (
For example, see Japanese Patent Application Laid-Open No. 2-157084, etc.).

[0019] Suitable treated waste liquids to which the present invention is applied are those that produce aggregates through coagulation treatment, and specifically include the following.

Negative photosensitive lithographic printing plate having a photosensitive layer using a diazo compound as a photosensitive component on an anodized aluminum support, and a negative photosensitive lithographic printing plate having a photosensitive layer using a diazo compound as a photosensitive component on a similar support, and a photosensitive layer using an o-quinone diazide compound as a photosensitive component on the same support. A positive-working photosensitive lithographic printing plate having a photosensitive layer as described above, a photoconductive layer is provided on the support as described above, a toner image is formed by an electrophotographic method, and then the photoconductive layer in the non-image area is removed by an elution process. A developer that has developed the lithographic printing material to be removed (for example, a pH 1 solution containing water as the main solvent containing alkali silicate, organic solvent, surfactant, organic or inorganic reducing agent, chelating agent, etc.)
Examples include waste liquids of developing solutions (Developers No. 2 to 13.5), post-processing liquids after the above-mentioned development, for example, waste liquids such as washing water from a washing step, desensitizing processing liquid, and rinsing liquid.

[0021]

[Example] Next, an example of the method of the present invention will be shown.

[0022] Negative PS plate SWN as a non-silver salt photosensitive material
(Product name, manufactured by Konica Corporation) 1003mm x 800m
A size M size was processed with a developer having the following composition using an automatic developing machine, and washed with water that was used for circulation.

Developer composition: ethylene glycol monophenyl ether
360g triethanolamine
210g Perex NBL
(manufactured by Kao Corporation, surfactant) 180g potassium sulfite
90g pure water

22 liters of developer waste (pH approximately 9.0) obtained by processing 400 12 liter PS plates was treated as follows.

Sulfuric acid (2
After adding 20 ml of 0%) and 20 ml of 20% aluminum sulfate as a flocculant and stirring at room temperature for 5 minutes, solid matter precipitated. The pH after neutralization was approximately 7.6. This liquid was sent to a solid-liquid separator 10 and separated into solid matter and filtrate. The heating pot 30 is made of cylindrical stainless steel with a capacity of 2 liters, and the heating device 31 is a 1 kW electric heater, so that the height of the liquid level in the heating pot 30 remains almost constant. When the treated waste liquid was sent by a pump, the amount of liquid sent was 100 ml/min.

The material of the filter medium used in the solid-liquid separator 10 is porous and made of PVA+phenol resin. The rotation speed of the filter member 11 is set to 17 rpm, and the filter member 1
The internal pressure of 1 was set to -540 mHg, and the treatment was performed. The developer waste solution with a concentration of 500 ppm is 10 ppm.
A filtrate concentration of m was obtained, the cake moisture content was 50% and the process rate was 1.0 l per hour. As a result of long-term running for one month, stable processing was achieved with no clogging due to sludge, and the method of removing sludge was improved and became easier.

[0026]

Effects of the Invention According to the present invention, in the method of adding a flocculant to the processing waste liquid of non-silver salt photosensitive materials to cause flocculation and solid-liquid separation, the flocculates can be easily recovered and solidified without replacing the filter. The liquid separation device can be operated for a long period of time, and the workability of separating aggregates and liquid is improved.

[Brief explanation of drawings]

FIG. 1 is a schematic cross-sectional view showing an example of a treatment waste liquid treatment device including an embodiment of the treatment device according to the present invention, FIG. 2 is a partial perspective view of the main parts thereof, and FIG. C-C of member 11
FIG.

[Explanation of symbols]

1. Processing waste liquid tank 2. Processing tank 10‥Solid-liquid separation device 11.Filtration member 17.Doctor Blade 30‥Evaporating pot 40‥Condenser

Claims (2)

[Claims] 1. After aggregation treatment is performed on the processing waste liquid of non-silver salt photosensitive materials, a solid-liquid mixture containing the aggregates is supplied to the circumferential surface of a hollow cylindrical filter member whose circumferential surface is formed of a filter medium. filtering by reducing the pressure inside the filtering member, sucking the filtrate inside the filtering member and discharging it outside the filtering member, and rotating the filtering member to scrape off solids attached to the surface of the filtering member. 1. A method for treating a processing waste liquid of non-silver salt photosensitive materials, which comprises separating a solid and a filtrate by using a filtrate. 2. A filter member comprising a hollow cylinder whose peripheral surface is formed of a filter material and whose interior can be depressurized, and which is rotatable about the axis of the hollow cylinder as a rotation axis; means for rotating the filter member about the axis of rotation; , means for reducing the pressure inside the filtration member, means for supplying the solid-liquid mixture to be filtered to the circumferential surface of the filtration member, means for sucking and discharging the filtrate from the inside of the filtration member to the outside of the filtration member; and a device for processing waste liquid from processing non-silver salt photosensitive materials, comprising means for scraping off deposits on the circumferential surface of the filter member.