JPH06304506A - Method for cleaning water tank of coating booth - Google Patents

Abstract

PURPOSE:To easily recover coating material sludge by charging a liquid treating agent for flocculating and settling the coating material sludge by gelatinizing the sludge into polluted water mingled with the coating material sludge in a water tank, then introducing the polluted water into a centrifugal separator and separating the coating material sludge. CONSTITUTION:The water tank 1 installed on the base of a water washing and coating booth is provided to recover and remove the excess coating material splashing or sticking to the wall surfaces of this booth by dropping the coating material into the water (a) filled in the water tank 1. The liquid treating agent (b) for flocculating and settling the coating material sludge A by gelatinizing the sludge is previously charged into the water (a) of such water tank 1 to flocculatate the coating material sludge A to a gel form and to settle the sludge in an unsolidified state into the water tank 1 when the coating material sludge A falls into the water (a). The polluted water contg. the gelatinized coating material sludge A is lifted by a pump 7 and is supplied to the centrifugal separator 2 at the time of cleaning the water tank 1. The particulates of the coating material sludge are captured on the inside wall of the rotary drum 3 and the clean supernatant is returned to the water tank 1 through a return pipe 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for cleaning a water tank for recovering and removing excess paint sludge generated in a paint booth.

[0002]

2. Description of the Related Art Paint that has scattered in a coating booth without being applied to the actual coating of the object to be coated or has adhered to the booth wall surface, etc. is applied to the bottom of the coating booth by natural fall or by using a water curtain. A system for dropping and dropping into water in an installed water tank to collect and remove is known.

The polluted water in the water tank mixed with the paint sludge produces a foul odor due to the decay of bacteria living in the paint sludge over time, so the water tank should be cleaned as often as possible. Although preferred, the work involved a great deal of work.

[0004]

Therefore, in recent years, for example, as in the case of the treatment liquid sold under the trade name of NIX by Nichikoken Co., Ltd., the coating sludge is decomposed into fine particles by being put into polluted water. A treatment liquid having a function of aggregating in the form of gel and precipitating in water has been developed, and a cleaning system using the treatment liquid has also been developed, and it is becoming popular in some areas.

This cleaning system is a system in which the paint sludge and bacteria are gelled by the treatment liquid as described above, and the polluted water is pumped up and passed through the filtration device. Generation is suppressed and water exchange becomes unnecessary for a long time, and the paint sludge is collected by the filtration device, which reduces the cleaning work itself, and the water purified by the filtration device is repeatedly used for a long time. Although it has many advantages such as being economical, it is time-consuming because collection of paint sludge and purification of water are carried out by filtration, and it is still unsatisfactory when considering work efficiency. Therefore, further improvement was desired.

[0006]

A method for cleaning a coating booth water tank according to the present invention has been completed based on the above-mentioned demand, and in a polluted water mixed with paint sludge in the water tank,
A treatment liquid with the ability to gel, agglomerate, and precipitate the paint sludge is added, and the polluted water containing the treatment liquid is pumped up and separated into a paint sludge and clean water by a centrifugal separator. It was configured.

[0007]

[Function] Since the treatment liquid is put into the contaminated water containing the paint sludge, the paint sludge is agglomerated into a gel and precipitates in the water tank without solidifying, and after a suitable time, the gelation occurs. When polluted water containing mixed paint sludge is pumped up and supplied to a centrifuge, the function of the centrifuge separates the paint sludge into clean water of the supernatant, and the paint sludge is collected and discarded. At the same time, the clean water is reused as water for removing paint sludge in the booth.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIG. In the figure, reference numeral 1 is a water tank installed on the bottom surface of the water-washing booth, and surplus paint that has been scattered or adhered to the booth wall surface etc. It is designed to be collected and removed by falling into the stretched water a.

In the water a in the water tank 1, the above-mentioned treatment liquid b manufactured by Nichikoken Co., Ltd. is added in advance.

A centrifugal separator 2 is installed on the side of the water tank 1. This centrifuge 2 is a known one, and while the rotating drum 3 is being rotated, the water to be treated containing fine particles is supplied to the inside of the rotating drum 3 from a supply port 5 of a case 4 which is fixedly provided around the rotating drum 3. When supplied, the fine particles contained in the water to be treated are forcibly precipitated on the inner wall of the rotating drum 3 by the action of the centrifugal force, and the clean supernatant liquid flows into the case 4 through the opening on the upper surface of the rotating drum 3. It is adapted to be continuously taken out from the outlet 6.

One end of a pumping pipe 8 provided with a pump 7 is connected to the supply port 5 of the centrifuge 2, and the other end is connected to the water tank 1.
A recirculation pipe 9 connected to the outlet 6 is guided to the water tank 1 side while being fitted into the bottom surface side of the.

Next, the operation of this embodiment will be described. When the surplus paint sludge drops into the water a of the water tank 1, the treatment liquid b is put therein, so that the paint sludge A is agglomerated into a gel and remains in the water tank 1 without solidifying. Settle. Along with this, bacteria inhabiting the paint sludge also agglomerate, and the generation of a bad odor due to the spoilage is suppressed, so that water exchange becomes unnecessary for a long time.

At the time of cleaning, the contaminated water containing the gelled paint sludge A is pumped up by the pump 7 and supplied to the centrifuge 2 through the pumping pipe 8. In that case, since the paint sludge A is deposited on the bottom surface of the water tank 1, the paint sludge A can be efficiently pumped up by the pumping pipe 8 inserted on the bottom surface side.

The coating sludge A gelled by the above-mentioned treatment liquid b has the property of re-aggregating and returning to the original separated state even when agitated, so that the centrifuge 2 is rotated. Due to the action of the centrifugal force that accompanies the rotation of the drum 3,
The fine particles of the paint sludge A contained in the polluted water are forcibly precipitated on the inner wall of the rotating drum 3, and the clean supernatant liquid is continuously taken out from the take-out port 6 through the reflux pipe 9 to the water tank 1. Will be returned. By continuously operating the centrifuge 2, the water tank 1 is circulated and cleaned.

After a suitable time has passed, the centrifuge 2 is stopped and the paint sludge A accumulated on the inner wall of the rotary drum 3 is discarded.

In the above-mentioned cleaning step, since it suffices to dispose of the paint sludge A from the centrifuge 2 in the cleaning process, the cleaning operation itself becomes extremely simple, and in particular, the paint sludge A and the clean water are separated. By performing the cleaning with the centrifugal separator 2 capable of high-speed separation, the cleaning time can be significantly shortened.

The clean water taken out from the centrifuge 2 is
By returning it to the water tank 1, it can be used again as water for removing paint sludge in the booth, and the treated liquid agent b mixed therein maintains the aggregating and precipitating ability for a long time, so that the liquid agent b is replenished. It is extremely economical as it requires only a small amount.

The present invention can be similarly applied to the cleaning of the water tank in the coating booth provided with the water curtain for forcibly dropping the paint sludge into the water tank.

[0019]

As described above in detail, according to the present invention, the use of the treating liquid agent having the function of preventing the generation of offensive odors makes it possible to eliminate the need for water exchange for a long period of time, and also to prevent the coating sludge from occurring. In addition to reducing the burden of cleaning work by collecting with a centrifuge, and having the same effect as before when the water purified by the centrifuge can be reused repeatedly for a long time and is economical. In particular, by using a centrifuge to separate the paint sludge from the clean water at the final disposal of the paint sludge, the work can be done efficiently in a shorter time than in the case of conventional filtration. There is an effect that can be.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a cleaning system for carrying out the method of the present invention.

[Explanation of symbols]

1: Water tank 2: Centrifuge 7: Pump A: (gelled) paint sludge a: Water b: Treatment liquid

Claims (1)

[Claims] 1. A water tank of a water-washing type coating booth, in which surplus paint sludge generated in the coating booth is dropped into water in a water tank installed on the bottom of the coating booth to be collected and removed. In the method, in the polluted water in which the paint sludge is mixed in the water tank, a treatment liquid agent having the ability to gel, agglomerate, and precipitate the paint sludge is added, and the polluted water in which the treatment liquid agent is added is added. A method for cleaning a water tank of a coating booth, which comprises pumping up the water and separating it into paint sludge and clean water by a centrifugal separator.