JPH08141550A - Waste liquid treatment apparatus - Google Patents

Abstract

PURPOSE: To provide a waste liquid treatment apparatus which can vaporize and concentrate efficiently waste liquid such as a developer and reduce its volume. CONSTITUTION: An apparatus is composed of an enclosable heating tank 10, a heating means 20 for heating the heating tank, a cooling pipe which takes out and cools expanded gas vaporized by the heating tank, a steam releasing means which selects only steam from the expanded gas taken out through the cooling pipe and releases it into the atmosphere, and a filter which filters and discharges liquid which was cooled and liquefied by the cooling pipe.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waste liquid treatment apparatus for treating, for example, a developer or a waste liquid obtained by washing a printed wiring board.

[0002]

2. Description of the Related Art Conventionally, waste solutions such as developing solutions are collectively collected from each developing station, transported by sea and abandoned to the ocean.

[0003]

The developer contains silver, iron, an organic compound and the like in addition to water. None of these substances are particularly harmful, but abandonment by the ocean is unacceptable to protect the environment. Therefore, the waste liquid is heated to separate water from the residue containing silver, iron, organic compounds, etc.,
The separated residue may be reused or treated as a hazardous material. By separating the water and the substance in this way, the largest amount of water is released to the atmosphere, so that the amount of the residue to be treated as a dangerous substance can be reduced.

However, since the expanded gas that has been vaporized contains gases such as ammonia, hydrogen sulfide, and amine-based hydrocarbons, the expanded gas cannot be released into the atmosphere as it is. For this reason, it is conceivable to let the expanded gas escape to the atmosphere through a filter for adsorbing these gases, but in order to enhance the gas adsorption effect, the filter acts in the direction of increasing the flow resistance to the gas. For this reason, there is a problem that the expanded gas cannot be smoothly (efficiently) released to the atmosphere.

When the expanded gas cannot be smoothly discharged to the atmosphere as described above, the pressure in the heating tank for vaporizing the waste liquid is increased, so that the vaporization efficiency is deteriorated, resulting in the disadvantage that the treatment time is long and the treatment is required. The drawback is that the amount of electric power increases. An object of the present invention is to provide a waste liquid treatment apparatus which can efficiently vaporize waste liquid without deteriorating the vaporization efficiency of the waste liquid and process a large amount of waste liquid in a short time.

[0006]

According to the present invention, there is provided a heating tank for heating and vaporizing waste liquid, a cooling pipe for discharging expanded gas vaporized in the heating tank from the heating tank and cooling the same, and a cooling pipe taken out through the cooling pipe. The waste liquid treatment device is constituted by a vapor discharge means for selecting only steam from the expanded gas to be discharged to the atmosphere, and a filter for filtering and discharging the liquefied fluid cooled by the cooling pipe.

In the present invention, it is further proposed that the vapor discharging means is constituted by a resin film which allows only vapor to pass therethrough. Since this type of resin film allows only water vapor to efficiently pass therethrough, it does not increase the pressure in the heating tank. Therefore, a large amount of waste liquid can be vaporized in a short time without deteriorating the vaporization efficiency in the heating tank, and a large amount of waste liquid can be treated with a small amount of electric energy.

Further, the resin film used as the vapor discharging means does not allow any permeation except water vapor. Therefore, no harmful gas is released to the atmosphere, and a highly safe waste liquid treatment device can be provided. Further, the liquid liquefied by the cooling action of the cooling pipe is discharged through the filter, so that ammonia, hydrogen sulfide, amine hydrocarbons and the like mixed during vaporization are adsorbed by the filter. Therefore, the liquid discharged from the filter is highly pure water and is harmless if discharged as it is.

[0009]

FIG. 1 shows an embodiment of the waste liquid treatment apparatus according to the present invention. In the figure, 10 indicates a heating tank. The heating tank 10 can be sealed with a lid 11. The lid 11 can be removed by loosening the lid retainer 12,
The waste liquid is poured into the heating tank 10 in the removed state. The heating means 20 is mounted so as to face the peripheral portion and the lower surface of the heating tank 10. An electric heater can be used as the heating means 20.

Reference numeral 30 indicates a cooling pipe. The cooling pipe 30 allows the expanded gas generated inside the heating tank 10 to flow into the heating tank 1
It is provided in order to lead out to the outside of 0, and to cool and liquefy the expanded gas. For this reason, in this example, as the heat radiating means, a case where a bellows tube made of stainless steel is used and the radiating area is made large by the bellows shape to enhance the cooling effect is shown. The branch pipe 31 is connected to the tip side of the cooling pipe 30, the vapor discharge means 40 is provided in one opening of the branch pipe 31, and the filter 50 is provided in the other opening. The vapor discharge means 40 is, for example, the cooling pipe 3.
It can be configured by a flange plate 41 having a large diameter attached to the opening end of 0 and a resin film 42 which covers the flange plate 41 and closes the opening of the branch pipe 31. Reference numeral 43 denotes a film holding metal member for detachably supporting the resin film 42 on the flange plate 41.

As the resin film 42, for example, a film made of polyvinyl alcohol or an aliphatic polyester film can be used. These resin films have the property of allowing only water vapor to pass therethrough and not allowing other substances to pass at all. By providing the vapor discharge means 40, the water vapor in the expanded gas that has permeated the cooling pipe 30 without being liquefied can be transmitted from the vapor discharge means 40 to the atmosphere.
As a result, the waste liquid can be efficiently vaporized without increasing the internal pressure of the heating tank 10.

The liquid liquefied in the cooling pipe 30 is filtered by a filter 50.
And is taken out to the container 52 through the drain valve 51. The filter 50 contains, for example, a filter medium in which activated clay and activated carbon are mixed. Activated clay is mainly ammonia,
Neutralize sulfides and the like, and activated carbon adsorbs fine particles. On the other hand, in this example, a drain pipe 13 is provided at the bottom of the heating tank 10, and the cock 14 is opened in a state where the amount of waste liquid in the heating tank 10 is reduced to an appropriate amount.
The case where the structure is such that the concentrated waste liquid can be taken out is shown.

Therefore, in this embodiment, by reducing the volume of the original waste liquid to, for example, about 1/10, it is possible to reduce the transportation cost for transporting the waste liquid to the secondary treatment plant. The drain pipe 13 is not always essential, and all the waste liquid can be vaporized in the heating tank 10 and the mixed metals, organic compounds, etc. can be solidified and taken out. When the contaminants are solidified and taken out as described above, the secondary treatment can be simplified.

[0014]

As described above, according to the present invention, the vapor discharge means 40 is provided at the end of the cooling pipe 30, and the steam is emitted to the atmosphere through the vapor discharge means 40. Therefore, the cooling pipe 30 and the heating tank 10 are provided. The internal pressure does not increase.
Therefore, the vaporization in the heating tank 10 proceeds efficiently, and the waste liquid can be vaporized with a small amount of energy in a short time.

In particular, in the present invention, since the vapor discharge means 40 uses the resin film 42 having the property of allowing only water vapor to pass therethrough, no harmful gas such as ammonia or sulfide gas is emitted to the atmosphere. The liquefied liquid is also filtered by the filter 5.
The liquid taken out to the container 52 is neutral water because the liquid is taken out by filtering at 0. Therefore, this water can be discharged to the sewer as it is.

Further, according to the present invention, since the waste liquid can be vaporized and concentrated to form a paste or solid,
The volume of waste can be significantly reduced. Therefore, for example, by installing and operating the waste liquid treatment apparatus according to the present invention in each photo developing station, there is an advantage that the transportation cost from each developing station to the processing station for secondarily treating the waste can be greatly reduced.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of the present invention.

[Explanation of symbols]

 10 Heating Tank 20 Heating Means 30 Cooling Pipe 40 Vapor Discharging Means 42 Resin Film 50 Filter

(72) Inventor Yu Kobayashi 5-36-15 Aoyagi, Soka City, Saitama Prefecture (72) Inventor Saburo Tanaka 1-33-2 Morino, Machida City, Tokyo

Claims (3)

[Claims] 1. A. First Embodiment A sealable heating tank, B. Heating means for heating the heating tank; A cooling pipe for leading out and cooling the expanded gas vaporized in the heating tank from the heating tank; Evaporating means for selecting only water vapor from the expanded gas taken out through the cooling pipe to release it to the atmosphere, E. A waste liquid treatment apparatus comprising: a filter for filtering and discharging a liquid that has been liquefied by being cooled by the cooling pipe. 2. The waste liquid treatment apparatus according to claim 1, wherein the vapor discharging means is constituted by attaching a resin film having a function of selectively permeating only water vapor to an opening communicating with the cooling pipe. . 3. A heating tank is provided with a discharge pipe and a valve for opening and closing a pipe line of the discharge pipe at the bottom of the heating tank, and the valve is opened when the amount of liquid in the waste liquid tank is reduced to a desired value. The waste liquid treatment apparatus according to claim 1, wherein the residual liquid remaining inside can be discharged to a recovery container.