JPH0852461A - Photographic waste liquor treating method and device therefor - Google Patents

Abstract

PURPOSE:To reduce running cost by improving the condensation efficiency of a gas evaporated from a photographic waste liquor and the thermal efficiency of the whole device in a treating device for reducing a final quantity of the photographic waste liquor by evaporation and condension under reduced pressure. CONSTITUTION:The photographic waste liquor in a condensation tank 1 is heated and condensed under reduced pressure. A solid matter is separated by filtering a primary condensed solution containing the solid matter in a filter tank 7. The obtained secondary waste liquor is heated in the condensation tank 1 under reduced pressure to condense again. The secondary condensed solution is filtered in the filter tank 7 to obtain the solid matter and a final waste liquor.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a processing method and a processing apparatus for evaporating and condensing photographic waste liquid discharged from an automatic developing and printing machine for still photographs.

[0002]

2. Description of the Related Art A processing apparatus of this type is disclosed in Japanese Patent Application Laid-Open No. 3-2583.
86, JP-A-3-288587, JP-A-4
-11984, etc., the raw waste liquid is heated under reduced pressure to be concentrated, and the evaporated water and gas are cooled and liquefied, then diluted with water and discarded. As a heat source for heating and cooling, a heat radiating portion and a heat absorbing portion of a heat pump are used. In the processing device disclosed in Japanese Patent Laid-Open No. 3-258386, the fluid solid matter finally remains at the bottom of the concentration tank. Since the amount of the solid matter is sufficiently smaller than that of the raw waste liquid, the cost required for the final treatment can be reduced.

[0003]

The evaporation amount of water and gas from the photographic waste liquid tends to decrease with the progress of the concentration process, and in particular, the evaporation gas is generated after the solid matter is deposited on the bottom of the tank. The amount is significantly reduced. Therefore, in the conventional processing mode in which all or most of the photographic waste liquid is continuously concentrated and solidified, it takes a long time to process the waste liquid. Further, there is a problem in that the amount of energy required for solidifying the waste liquid is large and the treatment cost is high.

In the above conventional apparatus, a condensing chamber and an evaporating chamber are defined above and below the concentrating tank, and an endothermic coil of a heat pump is arranged in the upper condensing chamber so that gas such as water vapor is brought into direct contact with the endothermic coil. Liquefy. In such a condensation mode, the gas cannot be efficiently brought into contact with the endothermic coil due to the fact that the condensation chamber is maintained in a reduced pressure state.
In order to condense all of the gas in the condensing chamber, it is necessary to set the heat transfer area of the endothermic coil to a sufficiently large value, which makes the concentrating tank large and makes it difficult to install the processing equipment in a minilab with a small store area. .

When the evaporation process is carried out under reduced pressure, the heating temperature of the photographic waste liquid is set to 20 to 60 in order to prevent generation of harmful gas.
It is kept at ℃. Therefore, when the compressor heat pump is used as a heat source for heating and a heat source for condensation, the cooling load becomes larger than the heating load. Since there is a difference in heat load and the condensation efficiency is low as described above, the conventional processing equipment is equipped with an air-cooled condenser in addition to the radiator to release excess heat to the atmosphere. However, there was a problem in that the overall thermal efficiency was low.

An object of the present invention is to provide a method for treating a photographic waste liquid, which can separate and remove solid matter deposited at the bottom of a concentration tank to efficiently concentrate a waste liquid, and to sufficiently reduce the processing time and processing cost thereof. To provide the equipment. It is another object of the present invention to provide a photographic waste liquid treatment method and apparatus capable of efficiently condensing vaporized gas and improving thermal efficiency by improving the condensation form of the vaporized gas. Another object of the present invention is to obtain a compact photographic waste liquid processing apparatus which can be installed even in a minilab having a small store area.

[0007]

In the waste liquid treatment method of the present invention, the inside of the concentrating tank 1 is depressurized by the vacuum pump 2, and the photographic waste liquid contained in this tank 1 is heated by the heat radiating portion 15 of the heat pump 3. After evaporating and condensing, the evaporative gas generated at the time of concentration is condensed by passing through the vacuum pump 2 while being cooled by using the cold heat of the heat absorbing portion 16 of the heat pump 3, and then the condensate is diluted with water and discarded. The primary concentrate containing the solid matter in the concentration tank 1 is filtered by the filtration tank 7 to separate the solid matter from the primary concentrate. The secondary waste liquid from which the solids have been removed is heated under reduced pressure in the concentration tank 1 to be reconcentrated. The re-concentrated secondary concentrated liquid is filtered by the filter tank 7 to produce a solid matter and a final waste liquid. Specifically, the heat exchanger 5 including the heat absorbing portion 16 of the heat pump 3 is provided, and heat exchange is performed inside the heat exchanger 5 between the evaporative gas, the cooling water, and the refrigerant passing through the heat absorbing portion 16. Then, the cooling water after heat exchange and the condensate containing the evaporative gas are merged, and the final condensation is performed by the water-sealed vacuum pump 2.

The photographic waste liquid treatment apparatus of the present invention contains a concentration tank 1 for evaporating and concentrating the photographic waste liquid, a water-sealed vacuum pump 2 for reducing the pressure in the concentration tank 1, and a sealing water for the vacuum pump 2. A sealing water tank 4 and a compressor-type heat pump 3 for supplying hot heat to the liquid phase portion in the concentrating tank 1 and supplying cold heat to the evaporated gas are provided. Inlet 17 of vacuum pump 2
The gas passage 21 communicates with the vapor phase portion of the concentrating tank 1, and a cooling water passage 47 for supplying cooling water is connected to an intermediate portion of the gas passage 21. The inlet 17 and the outlet 18 of the vacuum pump 2 are connected to the sealed water tank 4 via a water supply passage 19 and a drainage passage 20, respectively. A filtration tank 7 for separating a solid matter from both the concentrated liquids, which is a processing target, is provided for the primary concentrated liquid and the secondary concentrated liquid. The filtration tank 7 and the concentration tank 1 are connected by a solid-liquid supply passage 27 and a liquid return passage 32. Then, a pump for supplying the primary concentrated liquid and the secondary concentrated liquid to the filtration tank 7 through the solid-liquid supply passage 27 is provided.

In the above processing apparatus, a filtration tank 7 is provided integrally with the concentration tank 1 above the concentration tank 1. The gas phase portion of the filtration tank 7 and the gas passage 21 are connected by a bypass passage 29 including a bypass valve 31. The vacuum pressure of the vacuum pump 2 is applied to the concentration tank 1 via the gas passage 21, the bypass passage 29, the filtration tank 7, and the solid-liquid supply passage 27 to filter the primary concentrated liquid and the secondary concentrated liquid containing solids, respectively. It is configured so that it can be fed to the tank 7. In the middle of the gas passage 21,
The heat exchanger 5 including the heat absorbing portion 16 of the heat pump 3 is provided. The heat exchanger 5 includes a condensing part 5a through which evaporative gas passes and a water chamber 5b through which cooling water passes, respectively, adjacent to the heat absorbing parts 16 through which the refrigerant of the heat pump 3 passes. The gas passage 21 between the heat exchanger 5 and the vacuum pump 2 is connected to the cooling water passage 47 continuous with the outlet 57 of the water chamber 5b.
The heat exchanger 5 includes a tubular condensing portion 5a, a hollow cylindrical heat absorbing portion 16 that surrounds the outer peripheral surface of the condensing portion 5a, and a hollow cylindrical water chamber 5b that surrounds the outer peripheral surface of the heat absorbing portion 16. To form. A group of fins 51 is provided on the outer surface of the tube body 50 that divides the condenser section 5a.
To fix.

[0010]

The photographic waste liquid in the concentration tank 1 is heated and concentrated under reduced pressure. Along with the progress of the concentration process, a solid substance is deposited and settled on the bottom of the concentration tank 1. When the amount of solid matter deposited reaches a predetermined value, the amount of water or gas evaporated decreases. The primary concentrated liquid at this stage is sent to the filtration tank 7 together with the solids to separate and remove the solids, and the residual liquid, that is, the secondary waste liquid is concentrated again in the concentration tank 1. However, the heating temperature during reconcentration is
Make it slightly higher. When the solid matter is removed and reconcentration is performed in this way, the evaporation of the water content and the evaporative gas components contained in the secondary waste liquid can be promoted. From the secondary concentrated liquid after both the concentration, the solid matter is removed again through the filtration tank 7.

The gas evaporated in the concentration tank 1 is sucked into the vacuum pump 2 via the gas passage 21. At this time, water is supplied from the cooling water passage 22 connected to the gas passage 21,
The gas is cooled and part of it is condensed. The remaining gas is sucked into the vacuum pump 2 together with the sealing water in the sealing water tank 4, and is condensed while passing through the vacuum pump 2. The cold heat released from the heat absorbing portion 16 of the heat pump 3 cools at least one of the fluids. In this way, the gas can be efficiently condensed by cooling the gas with cooling water and cold heat and forcibly condensing it through the water-sealed vacuum pump 2. The water supplied from the cooling water passage 22 precools or condenses the high temperature gas, reduces the cooling load, and supplements the cooling capacity of the heat absorbing section 16. Therefore, the amount of heat required for heating and condensation can be balanced. Since the water-sealed vacuum pump 2 is used to forcibly condense gas while passing through the pump, it is not necessary to separately provide a condensing chamber or a condensing tank. Since the condensation speed matches the exhaust speed, the depressurization condition in the concentration tank 1 can be kept constant.

Since the filtration tank 7 is integrally provided on the upper portion of the concentration tank 1, and the vacuum pump 2 also serves as a pump for feeding both the primary and secondary concentrated liquids, the structure of the entire apparatus is simplified and the size is reduced. Can be achieved at the same time. The heat exchanger 5 including the heat absorbing portion 16 of the heat pump 3 is provided in the middle of the gas passage 21,
As a result, the evaporative gas and the cooling water are simultaneously cooled, so that the cold heat of the refrigerant passing through the heat absorbing portion 16 can be utilized without waste and the evaporative gas can be condensed efficiently.

[0013]

According to the present invention, when the solid substance is deposited on the bottom of the concentrating tank 1 and the evaporation amount of water or the like is reduced, the primary concentrated liquid is filtered in the filter tank 7 to remove the solid substance contained in the liquid. After separation and removal, the concentration is carried out again to promote the evaporation of water etc., so that the photographic waste liquid can be efficiently concentrated compared with the conventional processing mode in which concentration is performed continuously, and the processing time and processing cost are reduced. The running cost can be reduced.

The concentrating tank 1 is evacuated by a water-sealed vacuum horn 2, and the vaporized gas is forcibly condensed while it passes through the vacuum pump 2. Therefore, the condensation efficiency can be improved as compared with the conventional processing apparatus. . Since cooling water is constantly supplied from the cooling water passage 22 connected to the gas passage 21 to precool the gas or to condense a part thereof, the cooling load that the heat absorbing portion 16 must bear is reduced, and the heat radiating portion 15 Further, all the heat generated in the heat absorbing section 16 can be effectively used for waste liquid treatment, and the thermal efficiency of the treatment apparatus can be improved as a whole. According to the processing device that also uses the heat exchanger 5, the condensation efficiency can be further improved. Since the filtration tank 7 is integrally provided on the upper part of the concentration tank 1 and the vacuum pump 2 is used as a pump for feeding the concentration liquid, it is possible to realize the downsizing of the processing device, and the photographic waste liquid suitable for a minilab with a small store area. A processing device is obtained.

[0015]

1 to 7 show an embodiment of a processing apparatus according to the present invention. In FIG. 1, the processing apparatus of the present invention comprises a concentration tank 1 for containing photographic waste liquid, a vacuum pump 2 for reducing pressure,
A compressor-type heat pump 3, a sealed water tank 4, a heat exchanger 5 and the like are provided as main members. Reference numeral T is a plastic waste liquid container for containing the photographic waste liquid collected from the automatic development pattern attaching machine.

The concentrating tank 1 is made of a sealed stainless steel container, and the upper part of the inner surface thereof is divided into upper and lower parts by a conical partition wall 6, and the lower part of the partition wall 6 is a concentrating tank 1a and the upper part of the partition wall 6 is formed. Is the filtration tank 7. A liquid injection path 9 for injecting the waste liquid in the waste liquid container T is provided on the peripheral wall of the concentration tank 1a, and a solenoid valve 10 for opening and closing the passage is provided in the middle thereof.
Reference numeral 11 is a level sensor for detecting the liquid level of the waste liquid in the tank. The waste liquid container T is installed at a position higher than the concentration tank 1, and when the electromagnetic valve 10 is opened, the photographic waste liquid stored inside is supplied down into the concentration tank 1. Solenoid valve 1
0 receives the liquid level signal from the level sensor 11 and controls opening / closing. Reference numeral 12 is an atmosphere release valve composed of a solenoid valve.

The heat pump 3 includes a compressor 14,
The heat radiation part 15, the heat absorption part 16, an accumulator (not shown), and auxiliary equipment such as an expansion valve. The cylindrical coil-shaped heat radiating portion 15 is arranged in the concentrating tank 1, and the heat absorbing portion 16 is arranged in the heat exchanger 5 described later. By operating the heat pump 3, the photographic waste liquid in the concentration tank 1 can be heated by the heat radiating portion 15.

The vacuum pump 2 comprises a water-sealed pump,
The inlet 17 and the outlet 18 are connected to the sealed water tank 4 via a water supply passage 19 and a drainage passage 20, respectively, and the inlet 17 and the gas phase region of the concentration tank 1 are connected to a gas passage 21.
Connect with. An electromagnetic valve 22 for opening and closing the passage is provided near the concentration tank 1 of the gas passage 21. Reference numeral 21a is a check valve. When the vacuum pump 2 is driven by a motor (not shown) with the solenoid valve 22 open, the inside of the concentration tank 1 is exhausted, and at the same time, the water inside the sealed water tank 4 is sucked through the water supply passage 19. The water discharged from the pump returns to the sealed water tank 4 via the drainage passage 20. The outlet 23 is provided in the sealed water tank 4.
Is provided, and the water overflowing from the discharge port 23 is discharged to the sewer through the hose 24.

The filtration tank 7 is composed of the upper wall of the concentration tank 1, the partition wall 6 described above, and a filter 26 fixed to the upper end of the tank.
And form a closed container. In order to feed the concentrated liquid processed in the concentration tank 1a together with the solid matter deposited in the liquid to the filtration tank 7, the solid-liquid supply passage 27 is led out from the bottom wall of the concentration tank 1, and the leading end thereof is a filter. 26 to the inlet 28. Furthermore, the vacuum pump 2 is provided from the gas phase portion of the filtration tank 7 and the solenoid valve 22.
The gas passage 21 on the side is connected by a bypass passage 29. A filtering valve 30 and a bypass valve 31, each of which is an electromagnetic valve, are provided in the middle of both passages 27 and 29 so that the passages 27 and 29 can be opened and closed as needed. In order to return the filtered liquid in the filtration tank 7 to the concentration tank 1a, both tanks 7 · 1a are connected by a liquid return passage 32, and a solenoid valve 33 for opening and closing the passage is provided in the middle thereof. Further, in the passage between the filter valve 30 and the inlet 28 of the filter 26, an atmosphere release valve 34 composed of a solenoid valve is provided.
To provide.

2 and 3, the filter 26 comprises a thin dish-shaped base 36 fixed to the upper end of the concentration tank 1 and a lid 37 joined to the upper surface of the base 36 to form a filter container. The filtration element 38 is sandwiched and fixed between the joint surfaces of 37. A screen 39 made of a mesh or a perforated plate is provided on the upper surface of the concave portion on the side of the base 36 to support the filter element 38. A chamber that opens downward is formed in the lid 37, and the inlet 28 is provided in a state of communicating with this chamber. The base 36, lid 37, and screen 39 are each made of stainless steel. Lid 37
Can be swung open / closed around a shaft 40, and can be closely fixed to the base 36 by fastening three parts around it with bolts 41 and wing nuts 42. The bolt 41 can swing up and down around the pin 43 as shown by an imaginary line. Reference numeral 44 is packing, and 45 is a handle. The filter element is made of filter paper or chemically resistant non-woven fabric.

Basically, water or gas (ammonia compound or the like) evaporated in the concentration tank 1 is exhausted through the gas passage 21 and condensed while passing through the vacuum pump 2. In order to efficiently perform this condensation process, the heat exchanger 5 is arranged in the middle of the gas passage 21, and the heat absorbing portion 16 of the heat pump 3 is provided inside the heat exchanger 5. Furthermore, the water sent from the cooling water passage 47 is cooled via the heat exchanger 5, and is joined to the gas passage 21 between the heat exchanger 5 and the vacuum pump 2. A water passage valve 48, which is an electromagnetic valve, is provided in the cooling water passage 47.

In FIG. 4 and FIG. 5, the heat exchanger 5 has a condenser section 5 in which a group of fins 51 are fixed to the outer surface of a tube body 50.
a, the heat absorbing part 16 defined by the hollow cylinder 52 surrounding the outer peripheral surface of the condensing part 5a, and the hollow cylinder 53 surrounding the outer peripheral surface of the heat absorbing part 16.
And a water chamber 5b defined by Tube 5
Both ends of 0 are connected to the gas passage 21. The hollow cylinder 52 that defines the heat absorbing portion 16 has an inlet 54 and an outlet 55 at both ends, and connects these to the refrigerant passage of the heat pump 3. The inlet 56 and the outlet 57 at both ends of the hollow cylinder 53 that divides the water chamber 5b are connected to the cooling water passage 47, respectively.

Next, the processing method of the present invention using the above-mentioned photographic waste liquid processing apparatus will be described. The processing of the photographic waste liquid is completed by performing the primary concentration step, the filtration step, the secondary concentration step, and the filtration step in the order described. The details will be described for each step.

(Primary Concentration Step) To treat the photographic waste liquid, the vacuum pump 2 is operated to reduce the pressure inside the concentration tank 1a, and the waste liquid is radiated at 40 to 50 ° C. in the heat radiating portion 15 of the heat pump 3.
Heat to. At this time, the electromagnetic valve 22 and the water passage valve 48 are switched to the open state, and the others are closed. The solenoid valve 10 is opened when the level of the waste liquid in the concentrating tank 1a becomes a certain value or less, and replenishes the waste liquid a plurality of times until the completion of the primary concentrating step.

Evaporated gas such as moisture generated by heating under reduced pressure is sucked into the gas passage 21 from the concentrating tank 1a by the evacuation action of the vacuum pump 2 as indicated by the symbols to in FIG. Almost all of it is cooled by the refrigerant and condensed while passing through the. Further, the cooling water cooled by the heat exchanger 5 joins and is sucked by the vacuum pump 2, and the gas remaining while passing there is forcibly condensed. Since the lower the temperature of the cooling water sucked by the vacuum pump 2 is, the higher the pump efficiency is, the pressure in the concentrating tank 1a can be reduced correspondingly to accelerate the generation of the evaporative gas. The condensate is diluted in the sealed water tank 4 and discharged into the sewer. When the treatment in the concentration tank 1a progresses and the solid matter deposited in the liquid is settled at the bottom of the tank, the evaporation amount of water and gas is reduced.
At this point, the timer is timed to complete the primary concentration step.

(Filtration Step) In this step, the primary concentrated liquid containing the solid matter in the concentration tank 1 is filtered in the filtration tank 7,
Separate the solid from the primary concentrate. Specifically, the heat pump 3 is stopped, and the electromagnetic valve 22 and the water passage valve 48 are closed. Further, the atmosphere opening valve 12, the filtration valve 30, and the bypass valve 31 are opened. By these valve operations, the vacuum pressure of the vacuum pump 2 acts on the inside of the filtration tank 7 via the gas passage 21 and the bypass passage 29, and is concentrated via the solid-liquid supply passage 27, as indicated by the symbols 1 to 7 in FIG. It acts on the tank 1a. At this time,
The gas phase portion of the concentrating tank 1a is at atmospheric pressure due to the opening of the atmosphere opening valve 12. Therefore, the solid matter and the primary concentrated liquid in the concentrating tank 1a are sent to the filter 26 via the solid-liquid supply passage 27 as shown by the symbols 1 to 7 in FIG.
Only solids are separated and removed during passage through. The timer detects that a certain period of time has passed, and the atmosphere opening valve 12, the filtration valve 30, and the bypass valve 31 are closed. Solenoid valve 2 at the same time
2, the solenoid valve 33 of the liquid return passage 32, and the atmosphere release valve 34
And are opened, and the filtrate in the filtration tank 7 is made to flow down to the concentration tank 1a. The timer detects that a certain period of time has passed, the electromagnetic valve 33 and the atmosphere opening valve 34 are closed, and the filtration process is ended.

(Secondary Concentration Step) In this step, the secondary waste liquid from which the solid matter has been removed is heated in the concentration tank 1 under reduced pressure in the same manner as the primary concentration step to reconcentrate. However, evaporation is performed by setting the heating temperature of the waste liquid to 45 to 60 ° C. The waste liquid is not replenished from the waste liquid container T. Evaporated gas is condensed in the same manner as in the primary concentration step. Therefore, in this step, the heat pump 3 is operated to open the electromagnetic valve 22 and the water passage valve 48. The end of the process is specified by a timer.

(Filtration Step) The secondary concentrated solution reconcentrated as described above is filtered in the filtration tank 7 in the same manner as in the previous filtration step to produce solid matter and final waste liquid. This process is different from the previous filtration process in that the water flow valve 4 remains in the filtration state.
8 is opened to continuously supply the cooling water, the feeding time of the secondary concentrated liquid and the flowing time of the separated waste liquid into the concentrating tank 1a are set sufficiently long as compared with the previous filtration step. The point is different. During this time, solid matter is released to the atmosphere 34
Is exposed to the air flowing in through the solid-liquid supply passage 27 and is naturally dried. The waste liquid flowing down to the concentration tank 1a is extracted from an outlet (not shown) at the bottom of the tank. The waste liquid and the solid matter are respectively requested to a waste disposal company for final disposal.

In order to eliminate the bad odor contained in the evaporated gas, ozone gas can be supplied from the middle of the gas passage 21. When ozone gas is added, organic components such as amines and acetic acid can be denatured and deodorized. The filtration tank 7 can be provided separately from the concentration tank 1. In this case, a pump for feeding the waste liquid to the filtration tank 7 is, for example, the solid-liquid supply passage 2
Provide in 7. The waste liquid treatment method of the present invention can also be applied to the case where the pressure is reduced by a vacuum pump other than the water-sealed type.

[Brief description of drawings]

FIG. 1 is a diagram illustrating the principle of a processing device.

FIG. 2 is a vertical sectional view of a filtration tank.

FIG. 3 is a plan view of a filtration tank.

FIG. 4 is a sectional view of a heat exchanger.

FIG. 5 is a sectional view taken along line AA in FIG.

FIG. 6 is an explanatory diagram showing a gas flow state during a concentration operation.

FIG. 7 is an explanatory diagram showing a filtration operation state.

[Explanation of symbols]

 1 Concentration Tank 1a Concentration Tank 2 Vacuum Pump 3 Heat Pump 4 Sealing Water Tank 5 Heat Exchanger 7 Filtration Tank 15 Heat Dissipation Section 16 Endothermic Section 26 Filter 27 Solid Liquid Supply Passage 29 Bypass Passage 32 Liquid Return Passage T Waste Liquid Container

Claims (6)

[Claims] 1. The concentration tank 1 is placed under a reduced pressure by a vacuum pump 2, and the photographic waste liquid contained in the tank 1 is heated and evaporated and concentrated by a heat radiating portion 15 of a heat pump 3. A method for treating a photographic waste liquid, in which the condensed liquid is passed through the vacuum pump 2 and condensed while being cooled by utilizing the cold heat of the heat absorbing portion 16 of the heat pump 3, and then the condensed liquid is discarded by discarding it in the concentrating tank 1. The primary concentrated liquid containing the solid substance is filtered in a filter tank 7 to separate the solid substance from the primary concentrated liquid, and the secondary waste liquid from which the solid substance has been removed is heated under reduced pressure in the concentration tank 1 to be regenerated. The concentrated and re-concentrated secondary concentrate is filtered in a filter tank 7 to produce a solid matter and a final waste liquid, which is a photographic waste liquid treatment method. 2. A heat exchanger 5 including a heat absorbing portion 16 of a heat pump 3 is provided, and heat exchange is performed inside the heat exchanger 5 among evaporative gas, cooling water, and a refrigerant passing through the heat absorbing portion 16. The photographic waste liquid processing method according to claim 1, wherein the cooling water after heat exchange and the condensate containing the evaporative gas are combined, and the final condensation is performed by the water-sealed vacuum pump 2. 3. A concentration tank 1 for evaporating and condensing a photographic waste liquid.
A water-sealed vacuum pump 2 for decompressing the inside of the concentration tank 1, a sealed water tank 4 for containing sealing water of the vacuum pump 2, and a heat source for supplying liquid heat to the liquid phase portion in the concentration tank 1 for evaporation. A compressor-type heat pump 3 for supplying cold heat to the gas is provided, and the inlet 17 of the vacuum pump 2 and the vapor phase portion of the concentration tank 1 are
A gas passage 21 communicates with each other, and a cooling water passage 47 for supplying cooling water is connected to a midway portion of the gas passage 21. An inlet 17 and an outlet 18 of the vacuum pump 2 are connected to a water supply passage 19 and a drain passage, respectively. And a filtration tank 7 that is connected to the sealed water tank 4 via 20 and treats the primary concentrated solution and the secondary concentrated solution concentrated in the concentrated tank 1 to separate solid matter from both concentrated solutions. The filtration tank 7 and the concentration tank 1 are connected by the solid-liquid supply passage 27 and the liquid return passage 32, and the primary concentrated liquid and the secondary concentrated liquid are supplied to the filtration tank 7 via the solid-liquid supply passage 27. Photographic waste liquid treatment device equipped with a pump for feeding. 4. A filtration tank 7 is integrally provided on an upper part of the concentration tank 1, and a gas phase portion of the filtration tank 7 and a gas passage 21 are provided with a bypass valve 31.
Are connected by a bypass passage 29 including a gas passage 21, a bypass passage 2 and a vacuum pressure of the vacuum pump 2.
9, the concentration tank 1 through the filtration tank 7 and the solid-liquid supply passage 27
The photographic waste liquid treatment apparatus according to claim 3, wherein the primary concentrated solution and the secondary concentrated solution each containing solid matter can be fed to the filtration tank 7 by being acted on. 5. A heat exchanger 5 including a heat absorbing portion 16 of the heat pump 3 is provided in the middle of the gas passage 21, and the heat exchanger 5 is adjacent to the heat absorbing portion 16 through which the refrigerant of the heat pump 3 passes. Then, the condenser section 5 through which the evaporative gas passes
a and a water chamber 5b through which cooling water passes, the cooling water passage 47 connected to the outlet 57 of the water chamber 5b is connected to the gas passage 21 between the heat exchanger 5 and the vacuum pump 2. The photographic waste liquid treatment device according to claim 3 or 4. 6. The heat exchanger 5 comprises a tubular condensing part 5a, a hollow cylindrical heat absorbing part 16 surrounding the outer peripheral surface of the condensing part 5a, and a hollow cylindrical water chamber 5b surrounding the outer peripheral surface of the heat absorbing part 16. Is formed into a multi-cylindrical shape, and a group of fins 5 is formed on the outer surface of the tubular body 50 that divides the condensing part 5a.
6. The photographic waste liquid treatment apparatus according to claim 5, wherein 1 is fixed.