JPS63200882A - Apparatus for treating waste developing - Google Patents

Abstract

PURPOSE:To prevent diffusion of volatile matters causing environmental contamination and evaporated water into atmospheric air by causing evaporation at low temp. by blowing hot air to a belt-shaped evaporation medium which is moved together with waste photographic developing soln. adhered thereto and causing dew formation by cooling steam evaporated from the waste soln. CONSTITUTION:A waste soln. tank 7 contg. waste photographic developing soln. is arranged to the bottom of a main body case 2 having air sucking holes 4a, 4b and an air discharging hole 3. Air sucked through the air sucking holes 4a, 4b with fans 16a, 16b is blown onto belt-shaped evaporating media 14a, 14b erected in the waste soln. tank 7 with their bottoms introduced into the waste soln. tank 7 and moved together with the waste photographic developing soln. adhered thereto. The air blown onto the evaporation media is heated at the same time with heaters 17a, 17b. Further, the air after passing through the evaporation media is cooled in a dehumidifier 21 located between the evaporation media and the air discharging hole 3 to cause dew formation of the steam evaporated from the waste photographic developing soln. through the evaporation media and condensed water is recovered. As the result, the diffusion of volatile matters causing environmental contamination and evaporated water into atmospheric air is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a developer waste liquid processing apparatus used for concentrating photographic developer waste liquid.

[Conventional technology]

The photographic processing waste liquid (hereinafter simply referred to as waste liquid) discharged from photo processing machines cannot be disposed of in rivers etc. from the viewpoint of pollution prevention, so the actual situation is that the processing is entrusted to specialized companies. . Since most of this waste liquid is water, if the waste liquid is concentrated or solidified, the amount to be stored can be extremely small, and the storage space and subsequent processing can be simplified.

Recently, developing waste liquid processing apparatuses that can separate and recover solid substances contained in waste liquid have been commercially available. This developing waste liquid processing apparatus is configured such that waste liquid sent from a photographic processing machine via a pipe is temporarily stored in a receiving tank, and then sent to a transfer tank using a pump. In this transfer tank,
A transfer roller is rotatably provided in a partially immersed state, and the waste liquid is applied to the thermal cylinder via the transfer roller. As the thermal cylinder slowly rotates, the water in the waste liquid evaporates, and the remaining harmful solids are scraped off with a spatula and collected in a sludge catcher.

[Problem that the invention seeks to solve]

In the conventional developer waste liquid processing apparatus described above, the waste liquid is directly heated and solidified in a heat cylinder, so that not only moisture contained in the waste liquid but also volatile environmental pollutants such as ammonia and formalin are removed.

Sulfurous acid also evaporates. These environmental pollutants are exhausted from the apparatus body together with evaporated moisture, which poses a problem of adversely affecting the working environment and the natural environment.

Furthermore, since the humidity increases due to the evaporated moisture, there is also the drawback that articles, equipment, etc. that dislike moisture cannot be placed nearby.

SUMMARY OF THE INVENTION An object of the present invention is to provide a developer waste liquid treatment apparatus that improves exhaust safety by preventing volatile environmental pollutants and evaporated moisture from being dissipated into the atmosphere.

[Means for solving problems]

In order to achieve the above object, the present invention provides a developing waste liquid processing apparatus for concentrating photographic developing waste liquid. A waste liquid tank containing waste liquid, a belt-shaped evaporation medium that stands up with its lower part inserted into the waste liquid tank and moves while adhering the photographic developing waste liquid, and the above-mentioned suction air A fan that blows the air taken in through the hole, a heater that heats the air that is blown onto the evaporation medium, and a heater that is located between the evaporation medium and the exhaust hole, cools the air that has passed through the evaporation medium, and evaporates through the evaporation medium. It is equipped with a dehumidifier that condenses and collects the vapor of developer waste.

[Effect]

The belt-shaped evaporation medium moves while adhering to the waste liquid contained in the waste liquid tank. Warm air heated by a heater is blown toward this evaporation medium, and the adhering waste liquid is evaporated. Since the present invention uses a low-temperature evaporation method that blows hot air, evaporation of odor substances such as ammonia and formalin can be suppressed.

The vapor evaporated from the waste liquid enters a dehumidifier where it is condensed and collected. At this time, small amounts of evaporated environmental pollutants from the waste liquid are also collected together with the water.

The waste liquid in the waste liquid tank is concentrated and reduced as evaporation progresses. After waste liquid treatment, the concentrate (evaporation residue) remaining in the waste liquid tank is stored in a tank, etc., and when a suitable amount has accumulated, a specialist is requested to collect it.

Embodiments of the present invention will be described in detail below with reference to the drawings.

〔Example〕

FIG. 1 shows an embodiment of the developing waste liquid treatment apparatus of the present invention. An exhaust hole 3 is provided in the upper part of the main body case 2, and intake holes 4a and 4b are provided in both sides.

A waste liquid tank 7 is provided inside the main body case 2, and the waste liquid stored in the waste liquid tank 5 is supplied by a pump IO via a waste liquid vibro. The operation of this pump 10 is stopped by a drive circuit 9 when a float switch 8 installed in the waste liquid tank 7 detects the liquid level, so that the waste liquid 1) in the waste liquid tank 7 is kept at a constant level. kept at the liquid level.

At the bottom of the waste liquid tank 7, concentrated waste liquid (residual residue) 1)
In order to discharge the water out of the main body case 2, the discharge pipe 7
A is provided, and a drain valve 7b is attached to this. In addition, a pulley 12 is provided on the bottom of the waste liquid tank 7.
a and 12b are attached at appropriate intervals, and a corresponding boo')-13 is provided inside the main body case 2.
Between a and 13b, there is a mesh endless belt 14.
a.

14b is given to each person. These pulleys 13a, 13b are connected to a motor M1 via belts 15a, 15b, and by driving the motor M1, endless belts 14a, 14b can be run, respectively.

The endless bells 14a and 14b are used as an evaporation medium for evaporating waste liquid, and air is blown against them by fans 16a and 16b arranged outside. A fan 16a is used to effectively perform evaporation by blowing the air.

A heater 178.17b is arranged behind 16b.

A duct 18 is provided so that a portion thereof enters between the pair of endless belts 14a and 14b.
A fan 19 is provided within the fan 8 . This fan 19
■When driven by the motor Ml via the belt 20,
Air containing moisture evaporated from the waste liquid 1) adhering to the endless belts 14a, 14b is sucked into the duct 18.

A dehumidifier 21 is attached to the other end of the duct 18, and the dehumidifier 21 dehumidifies the air sent by the fan I9. This dehumidifier 21 is composed of a cooler 21a and a radiator 21b, which are integrally arranged adjacent to each other.

The cooler 21a and the radiator 21b are connected by a vibrator 22a with an expansion valve 24 interposed therebetween, and the refrigerant liquefied in the radiator 21b is sent to the cooler 21a. Further, a pipe 22b is provided to send the refrigerant evaporated in the cooler 21a to the radiator 21b, and a compressor 23 is disposed in the middle of the pipe 22b. This compressor 23 pressurizes the refrigerant vapor to turn it into heated vapor, which is sent to the radiator 21b. In this V % device 21b, the refrigerant vapor is cooled by the surrounding heat and becomes a liquid, and this liquefied refrigerant is expanded by the expansion valve 24 and its temperature is lowered. This low-pressure, low-temperature refrigerant is sent to the cooler 21a, absorbs ambient heat, becomes low-pressure steam, and is returned to the compressor 23. Therefore, the air flowing into the dehumidifier 21 is cooled by the cooler 21a, and the moisture contained in this air condenses on the cooler 21a. Here, gas-liquid separation is performed, and the dry, cold air after dehumidification is warmed as it passes through the radiator 21b. The air flow sent by the fan 19 is
Since the dehumidifier 21 is weakened by passing through two heat exchangers in the dehumidifier 21, the dehumidifier 2
A fan 25 is provided to improve the flow of air within 1.

A water droplet tray 26 is installed below the dehumidifier 21 to receive water droplets cooled and condensed by the cooler 21a. A vibrator 27 is attached to the dish 26 of this water drip tray, and the water drip tray collects the water dripping onto the tray 26 through a first filter 28. Sequentially sent to the second filter 29. The first filter 28 contains activated carbon to remove organic matter, and the second filter 29 contains clay to remove ammonia and the like. The purified water that has passed through these two filters 28 and 29 is discharged to the outside of the main case 2 via a drainage vibrator 30.

Next, the operation of the above embodiment will be explained. Waste liquid tank 5
The waste liquid 1) stored in
will be sent to. As the amount of this waste liquid 1) increases,
The liquid level of the waste liquid 1) in the waste liquid tank 7 rises. When the liquid level is detected by the float switch 8, the operation of the pump 10 is stopped. In addition, when the liquid level of the developer waste liquid 1) falls during processing, the float switch 8 becomes 0FFL and the drive circuit 9
The pump 10 is activated again via . As a result, a predetermined amount of waste liquid 1) is always stored in the waste liquid tank 7.

%-tar M 1 When moving, endless belt 1
4a and 14b run partially immersed in the waste liquid 1). Therefore, abandoned? The endless belts 14a and 14b to which fL1) is attached are pulled out from the waste liquid tank 7 and exposed to the outside air. The endless belts 14a, 14b exposed to the outside air are sucked in from the air intake holes 4a, 4b by the fans 16a, 16b, and the heaters 17a, 17b
Warmed air is blown out. The hot air heated by the heaters 17a, 17b is blown onto the endless bells l-14a, 14b, and when passing between them, evaporates the moisture in the waste liquid adhering to the endless belts 14a, 14b. endless belt 14a,
As 14b continuously rotates, water in the waste liquid ll progresses in evaporation, so that the waste liquid 1) in the waste liquid tank 7 is gradually concentrated. When this concentration progresses to a certain extent, for example, about 10 times, the waste liquid treatment is completed. After this, the drain valve 7a is opened and the concentrated waste liquid remaining in the waste liquid tank 7 is transferred to another container and stored, and when a certain amount has accumulated, it is delivered to a waste liquid recovery company.

The air that has passed through the endless belts 14a and 14b contains a large amount of water contained in the waste liquid. The air containing this evaporated content is sent to the dehumidifier 21 through the duct 1B by the fan 19. Then, this air comes into contact with the cooler 21a, is cooled, and condenses on the cooler 21a. The condensed water drops flow through the cooler 21a, and the water droplet drips onto the tray 26.

Dry, cold air after dehumidification is discharged from the cooler 21a, but this is warmed by the radiator 21b. This warmed air is circulated within the main body case 2 by the fan 25 for reuse, and a portion of it is radiated out of the main body case 2 through the exhaust hole 3. Therefore, there is no possibility of increasing the humidity around the developing waste liquid processing device.

In addition, trace amounts of organic substances and odorous substances (ammonia, etc.) are also evaporated, although the evaporation is performed at a low temperature. However, since these organic substances are absorbed into the water droplets condensed on the cooler 21a, the water dripping onto the dish 26 of the water droplet tray contains organic substances. In order to remove this, the water in the tray 26 is passed through a water supply vibrator 27 to a first filter 28. It is sequentially sent to the second filter 29.

Trace amounts of organic matter are filtered through activated carbon in the first filter 28,
Ammonia and the like are adsorbed and purified by the second filter 29.

This purified waste water is drained out of the main body case 2 through the drain pipe 30, and placed in a separately prepared container, or
Or just pour it down the drain.

The COD (chemical oxygen demand) in the waste liquid is 30,000
to 40,000 ppm, and Fe is 1,000 to 17
00 ppm, but if this is evaporated at a low temperature and then condensed, the COD will drop to 3000 to 4000 ppm. When this dew-condensed water is passed through the first and second filters 28 and 29, the COD becomes 900 ppm or less, and the Fe content becomes 0.2 ppm or less.

Note that as the endless belts 14a and 14b, a synthetic sheet with a mesh structure, cloth, or the like can be used as long as the waste liquid 1) easily adheres thereto.

Furthermore, in the illustrated embodiment, two endless belts 14a are used in order to increase the evaporation efficiency and to avoid increasing the size of the device itself.

14b are arranged in parallel, but the number is not necessarily limited to this.

Further, if the temperature of the warm air is 40 degrees or less, the concentration efficiency is poor, and if the temperature is higher than that, the higher the temperature, the better the efficiency. However, 6
If the temperature exceeds 0 degrees, ammonia, formalin, etc. dissolved in the waste liquid will separate from the water, corroding the surrounding area or emitting a bad odor. Therefore, the temperature is detected by a sensor and the temperature of the heaters 17a and 17b is controlled so that the hot air is kept at an appropriate temperature within the range of 40 degrees to 60 degrees. .

Since the heating amount of heater 17b is different, heater 17a.

If the power consumption of 17b is made switchable, ammonia, formalin, etc. are not separated from water, and efficient concentration can be performed. Therefore, heater 17
The calorific value of a and 17b is preferably set to maintain the temperature of the hot air between 40 degrees and 50 degrees.

〔Effect of the invention〕

As explained in detail above, according to the developing waste liquid processing apparatus of the present invention, since low-temperature evaporation is performed by blowing hot air, it is possible to suppress the evaporation of environmental pollutants, thereby preventing any adverse effects on the working environment and the natural environment. There is no. In addition, the vapor that evaporates from the waste liquid is cooled and condensed, and water vapor and trace amounts of environmental pollutants are removed before exhausting, so no humid air or environmental pollutants are discharged from the waste developer processing equipment. . Therefore, unlike conventional devices, there is no problem such as abnormally increasing the humidity around the device or polluting the environment.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of an embodiment of the developer waste liquid treatment apparatus of the present invention. 2...Body case 3...Exhaust holes 4a, 4b...Intake hole 7...Waste liquid tank 14a, 14b-Belt 16a, 16b-...7y7 17a, 17tz...Heater 19...Fan 21... - Dehumidifier 21a, cooler 21b, radiator.

Claims (5)

[Claims] (1) A developing waste liquid processing device that concentrates photographic developing waste liquid includes a main body case in which an intake hole and an exhaust hole are formed, a waste liquid tank disposed below the main body case and containing the photographic developing waste liquid inside, and A belt-shaped evaporation medium that stands up with its lower part inserted into a waste liquid tank and moves while adhering photographic developing waste liquid; and a fan that blows air sucked in from the intake hole onto the evaporative medium to which the photographic developing waste liquid is adhered. , a heater that heats the air that is blown onto the evaporation medium, and a heater that is located between the evaporation medium and the exhaust hole, cools the air that has passed through the evaporation medium, and condenses and collects the vapor of the developer waste that evaporated through the evaporation medium. A developing waste liquid processing device characterized by being equipped with a dehumidifier. (2) Two of the evaporation media are arranged to face each other,
2. The developer waste liquid processing apparatus according to claim 1, wherein two of the fans are arranged so as to sandwich the two evaporation media. (3) The developing waste liquid treatment apparatus according to claim 1 or 2, wherein the heater is disposed between the evaporation medium and the fan. (4) The dehumidifier is composed of a cooler and a radiator,
Claim 1: This radiator heats a part of the air after dehumidification in order to recirculate and utilize it.
The developing waste liquid treatment device according to any one of Items 1 to 3. (5) The developer waste liquid treatment apparatus according to claim 1, wherein the evaporation medium is an endless belt having a mesh structure.