JP2000334479A - Detoxication treating device of waste water in finish washing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a treatment for detoxicating waste water in finish washing and elimination of a drying process. SOLUTION: A material to be washed 2 with a small quantity of an adhered detergent 4 is brought into contact with a supercritical gas within a pressure vessel 3 to dissolve the detergent 4 and water into the super critical gas and then the gas is vaporized in a trapping vessel 8 to separate the detergent 4 and water. Water A is added to this separation liquid and the resultant mixture is introduced into a spiral tube S vertically helically disposed in an electric furnace 17. The detergent 4 is perfectly decomposed by a supercritical hydroxylation reaction into water and carbon 21, which are continuously cooled and recovered.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system for detoxifying waste liquid in finishing cleaning and eliminating a drying step.

[0002]

2. Description of the Related Art After cleaning an object to be treated with contaminants in a container filled with a strong cleaning agent, the cleaning agent remaining on the surface of the object to be washed off is dried and finished. Finishing consists of repeated washing and drying steps of clean water.

[0003]

In the above-mentioned finishing, repeated administration of clean water is burdensome in both cost and man-hour, and finally, in a drying step (the attached water is rotated at high speed using centrifugal force). A method of draining water, forcibly drying using a vacuum, or spraying with air or the like is also required.

[0004] Further, there is a problem that the administered clean water contains a small amount of a cleaning agent, and it is difficult to dispose it as it is.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a system capable of simultaneously achieving detoxification and drying of a waste liquid in only one step in finish cleaning. It is in.

[0006]

In order to achieve the above object, a system for detoxifying waste liquid and eliminating the need for a drying step in the final cleaning according to the present invention comprises: After dissolving the detergent and moisture in the supercritical gas by contacting with the supercritical gas in the, the gas is vaporized in a trap tank to separate the detergent and moisture,
The separated liquid is added to water and charged vertically into a spiral pipe of a meandering pipe in an electric furnace, and the detergent is completely decomposed into water and carbon by a supercritical water oxidation reaction in the spiral pipe,
It is intended to be continuously cooled and collected.

[0007]

[Function] The water and the cleaning agent remaining on the surface of the object to be cleaned are dissolved in a supercritical gas in a pressure vessel, and the supercritical gas can be used at around normal temperature. However, moisture in the air does not adhere to the surface of the object to be treated, and no water droplets are generated. Here, finishing is performed without any need for a drying step.

On the other hand, the cleaning agent-containing liquid separated from the supercritical gas in the trap tank is completely decomposed by a supercritical water oxidation reaction in a spiral tube, and water and carbon remaining in the lower part are continuously discharged to the outside of the high-pressure system. Is discharged.

Here, the supercritical hydroxylation reaction is to completely decompose organic substances into water and carbon dioxide by using water under supercritical conditions (374 ° C. or more, 22 Mpa or more) as a medium for the decomposition reaction. The reaction is pyrolysis,
It is known that hydrolysis and oxidative decomposition can proceed simultaneously to perform complete decomposition in a closed system and to achieve a very high reaction rate.

That is, water under supercritical conditions can dissolve organic substances which are difficult to dissolve under normal pressure due to the change in polarization characteristics (thus, it becomes an excellent solvent), and water When an oxidizing agent such as oxygen or aqueous hydrogen peroxide coexists, these are also uniformly dispersed, and oxidative heat (combustion) of the organic substance occurs, and the decomposition reaction proceeds without additional input of combustion energy.

The degree of decomposition is, for example, 99.99% or more in the case of PCB, which is close to complete decomposition, and the reaction conditions are mild compared to combustion. It is a very promising treatment technology in the future as well as in recent years where the treatment of harmful organic substances has become a problem without causing the generation of secondary harmful substances such as dioxins.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIG.

The present invention is based on the premise that the object 1 to be cleaned is completely cleaned in the container 1 containing the cleaning agent A. Next, the cleaning object 2 to which a small amount of the cleaning agent has adhered is inserted into the pressure vessel 3, and the valve 5 of the pipe from the cylinder 6 containing the supercritical CO ₂ gas is opened to open the cylinder 6.
When the carbon dioxide is further fed, the cleaning object 4 to which the cleaning agent 4 has adhered is removed, and the dried cleaning object 2 without the cleaning agent 4 is taken out.

Next, the valve 7 of the outlet pipe of the pressure vessel 3 is
Opening traps carbon dioxide and a small amount of detergent
It is discharged to 8. CO in trap tank 8_Two Goes to cylinder 6
Operate the pump 9 and the valve 10 attached to the continuous pipe
And only carbon dioxide is vaporized and collected in the cylinder 6.
That is, the cleaning agent 4 and CO_Two Below zero degree
And this is to be sucked by the pressure pump 9
CO at lower temperatures _Two Only can be taken out by the principle of distillation
The cleaning agent 4 which has not evaporated remains at the bottom of the tank 8.
Remains as a difference.

On the other hand, the cleaning agent 4 and water remaining at the bottom of the trap tank 8 are sent out by operating the valve 11, the pump 12, and the valve 13 on the outlet pipe. In the middle of the pipe at the delivery destination, the pump 15 operates the water A contained in the container 14 to mix it into the cleaning agent 4 in the pipe, and opens the valve 16. It is fed into a spiral tube S meandering vertically in the furnace 17.
A liquid in which water A and the cleaning agent 4 are mixed is fed and decomposed into water and carbon by a supercritical water oxidation reaction. By opening the valve 19 at the outlet side of the spiral tube S, safe water and carbon 21 reacted from the electric furnace 17 are discharged, cooled to the normal temperature by the cooler 18, and collected in the tank 20. The opening of the valve 19 is continuous assuming that water and carbon remain, and the discharge is continued without stopping.
However, there is no loss of the internal pressure due to the water and carbon plug effect of the internal pressure.

In this method, since the spiral tube S itself is considered as a container, the length of the pipe in the furnace 17 can be several meters to several tens of meters. Thus, the length of the pipe can be freely changed, and the time required for the reaction can be shortened or lengthened by adjusting the pipe. The water that becomes supercritical by heating during meandering is well mixed with the cleaning agent 4 and provides a good reaction.

Further, since the container is not used, it is not necessary to open and close the container and the troublesome lid of the container, and since it is a closed processing method, the processing can be performed cleanly only in the pipe without touching the outside air. . The spiral tube S of the reaction chamber is disposed in the electric furnace 17 and is protected by a double wall, so that it can be safely processed without any problem such as waste gas, scattering and contact with the human body.

[0018]

The present invention is configured as described above.
The following effects are obtained.

Since the supercritical water oxidation reaction is efficiently achieved during meandering and the discharge of the reactants is continued, the treatment efficiency is excellent. In addition, the injection on the entry side is merely press-fitting, and the work efficiency is excellent.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a system of the present invention.

[Explanation of symbols]

 Reference Signs List 1 container 2 object to be washed 3 pressure container 4 cleaning agent 5 valve 6 cylinder 7 valve 8 trap tank 9 pump 10 valve 11 valve 12 pump 13 valve 14 container 15 pump 16 valve 17 electric furnace 18 cooler 19 valve 20 tank 21 carbon

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[Procedure amendment]

[Submission Date] March 14, 2000 (200.3.1)
4)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Name of invention

[Correction method] Change

[Correction contents]

[Title of the Invention] Detoxification of waste liquid in finish cleaning
apparatus

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0005

[Correction method] Change

[Correction contents]

The present invention has been made in view of the above circumstances, and has as its object to provide an apparatus for detoxifying waste liquid in finishing cleaning.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0006

[Correction method] Change

[Correction contents]

[0006]

Means for Achieving the Object To achieve the above object, the detoxification processing apparatus for waste liquid in the final cleaning according to the present invention comprises: After dissolving the cleaning agent and moisture in the supercritical gas by contacting with the supercritical gas, the separated liquid in the final cleaning for vaporizing the gas in a trap tank to separate the cleaning agent and water is used. Water is added and charged vertically into a spiral pipe of a meandering pipe in an electric furnace.The cleaning agent is completely decomposed into water and carbon dioxide by a supercritical water oxidation reaction in the spiral pipe, and continuously cooled. It is said that it will be recovered.

[Procedure amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction contents]

On the other hand, cleaning agents containing solution is separated from the supercritical gas in the trap vessel is completely degraded at supercritical water reaction in the spiral tube, continuous water and carbon dioxide accumulating in the bottom by the recovery upon cooling And discharged out of the high-pressure system.

[Procedure amendment 6]

[Document name to be amended] Statement

[Correction target item name] 0013

[Correction method] Change

[Correction contents]

The present invention is based on the premise that the object 2 to be cleaned is completely cleaned in the container 1 containing the cleaning agent 4 . Next, the cleaning object 2 to which a small amount of the cleaning agent has adhered is inserted into the pressure vessel 3, and the valve 5 of the pipe from the cylinder 6 containing the supercritical CO ₂ gas is opened, so that the cylinder 6 is opened.
When the carbon dioxide is further fed, the cleaning object 4 to which the cleaning agent 4 has adhered is removed, and the dried cleaning object 2 without the cleaning agent 4 is taken out.

[Procedure amendment 7]

[Document name to be amended] Statement

[Correction target item name] 0015

[Correction method] Change

[Correction contents]

On the other hand, the cleaning agent 4 and water remaining at the bottom of the trap tank 8 are sent out by operating the valve 11, the pump 12, and the valve 13 on the outlet pipe. In the middle of the pipe at the delivery destination, the pump 15 operates the water A contained in the container 14 to mix it into the cleaning agent 4 in the pipe, and opens the valve 16. It is fed into a spiral tube S meandering vertically in the furnace 17.
The liquid in which the water A and the cleaning agent 4 are mixed is fed and decomposed into water and carbon dioxide by a supercritical water oxidation reaction. By opening the valve 19 on the outlet side of the spiral tube S, the reacted safe water and carbon dioxide 21 are discharged from the electric furnace 17,
It is cooled to a normal temperature by the cooler 18 and collected in the tank 20. The opening of the valve 19 is continuous assuming that water and carbon dioxide remain, and the discharge is continued without stopping. However, there is no escape of internal pressure due to the plugging effect of water and carbon dioxide at internal pressure.

Claims (1)

[Claims] An object to be cleaned, to which a small amount of a cleaning agent has adhered, is brought into contact with a supercritical gas in a pressure vessel to dissolve the cleaning agent and water in the supercritical gas, and then the liquid is dissolved in a trap tank. The gas is vaporized to separate the cleaning agent and water, the separated liquid is added with water, and is vertically charged into a spiral pipe of a meandering pipe in an electric furnace, and subjected to a supercritical hydroxylation reaction in the spiral pipe. A system for detoxifying waste liquid and eliminating the need for a drying process in finish cleaning, characterized in that the cleaning agent is completely decomposed into water and carbon, and then continuously cooled and collected.