JPH0621434Y2 - Wastewater purification equipment for dry cleaning equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a waste water purification device applied to a dry cleaning device.

(Prior Art) First, an outline of a conventional dry cleaning device will be described with reference to FIG. The organic solvent used for dry cleaning is perchlorethylene, 1.1.1-trichloroethane, 1.1.2-trichloro-1.2.2-trifluoroethane (R113), trichloromonofluoromethane (R1).
1), etc., but in the following description, perchlorethylene will be taken as an example.

That is, in the figure, reference numeral 1 is a door, and when the clothes 2 to be cleaned are put in from the door 1 and the door 1 is closed and the operation is started, the process normally proceeds in the following order.

(1) The solvent 4 is pumped up from the solvent tank 3 via the valve 5 by the pump 6, and the required amount of the solvent 4 is sent to the processing tank 10 through the path including the valve 7 and the filter 8 or the path including the valve 9.

(2) When the necessary amount of the solvent 4 is supplied into the processing tank 10, the processing drum 11 in the processing tank 10 is slowly rotated next, and the solvent 4 is supplied to the processing tank 10, the button trap 12, the valve 13 and the pump 6. After that, the clothes 2 are circulated through the path including the valve 7 and the filter 8 or the path including the valve 9 to wash the clothes 2.

(3) After cleaning for a predetermined time, the solvent 4 in the processing tank 10
Is a processing tank 10, a button trap 12, a valve 13, a pump 6,
The liquid is discharged to the distiller 15 through the path of the valve 14, and then the processing drum 11 is rotated at a high speed to centrifuge the solvent 4 in the clothing 2.
Drain. The solvent in the distiller 15 evaporates and the condenser
After being led to 27 and condensed here, it is recovered and water separator
Water is separated at 22, and the cleaning tank 24 is passed through the solvent pipe 23.
Then, the partition plate with overflow 28 is returned to the solvent tank 3.

(4) The above steps (1) and (2) are repeated to perform washing.

(5) Processing tank 10, button trap 12, valve 13, valve 5
The liquid is drained to the solvent tank 3 through the path of, and then the processing drum 11
Rotates at a high speed to centrifuge the solvent 4 in the clothing 2 and drain it.

(6) Slowly rotate the processing drum 11 again to recover the recovery air duct 19 including the fan 16, the air cooler 17, and the air heater 18.
Air is circulated in the direction of arrow 20 between the processing tank 10 and the processing tank 10 to dry the garment 2. At this time, the solvent gas evaporated from the clothes 2 is cooled by the air cooler 17 provided in the recovery air duct 19.
Is condensed, and this condensate passes through the recovery path 21 and the water separator 22.
Then, after the water is separated here, it enters the clean tank 24 through the solvent pipe 23.

(7) When drying is completed, the damper 2 of the recovery air duct 19
5, 26 open as shown by broken lines, fresh air is taken in from the damper 25, uncondensed solvent gas that cannot be recovered by the air cooler 17 is exhausted from the damper 26, and the solvent odor in the clothing 2 is deodorized.

One cycle of the above (1) to (7) is divided as shown in FIG.

In addition, 30 in FIG. 3 is a steam pipe, and the air heater 18
Is for heating the air that has passed through the air cooler 17 and is for cooling water piping for condensing and liquefying the solvent gas evaporated in the distiller 15. Further, 32 is a steam pipe, which heats and distills the solvent discharged to the distiller 15 from the surroundings (hereinafter referred to as "indirect heat distillation").
33 is a steam pipe, and this steam pipe 33 directly heats and distills the solvent discharged to the distiller 15 (hereinafter, this is referred to as direct distilling).

Here, since the indirectly heated distillation is automatically performed in the step (3), it is generally called continuous distillation. Solid dirt and oily dirt are accumulated as distillation residue in the distiller 15 by the indirect heat distillation, but if it accumulates too much, it diminishes the distillation effect and finally does not evaporate, so it should be removed at the end of daily work etc. .

Further, the direct heat distillation is performed by operating the valve of the steam pipe 33 when the solvent gas contained in the distillation residue is expelled prior to the above.

In the above apparatus, there are three ways in which the recovered solvent flows into the water separator 22 as described above (the step (3), the step (6) and the direct heat distillation). All the water contained in is separated by the difference in specific gravity, the separated water is discharged from the pipe 29 to the outside of the system, and is discarded as it is. Therefore, the separated water contains a considerable amount of solvent. For example, taking a small machine as an example of the amount of dry cleaner to be processed per day, assuming that 10 kg of the object to be washed is carried out about 10 times, the amount of waste water discharged from the water separator 22 is about 6 / day. , Of which the amount of wastewater from indirect heat distillation Q ₁
= 2 / day, and the amount of wastewater from direct heat distillation Q ₂ = 4 / day. And the solvent concentration in these wastewater is Q ₁
Solvent concentration = 100 ppm, and also a solvent concentration = 300 ppm of Q _2.

When a large amount of this is operated intensively, there arises a problem that the groundwater in the area is contaminated with the solvent dissolved in the wastewater. In particular, recently, pollution of tap water groundwater with organic chlorine compounds has been regarded as a problem, and related ministries and agencies have begun to take measures against it. Therefore, it is necessary to urgently solve the problem of pollution, as shown in Fig. 5. A waste water purification device (for example, Japanese Patent Laid-Open No. 60-222091) has been proposed.

In FIG. 5, 43 is a tank for receiving and storing the water separated by the water separator 22 in the main body 34 of the dry cleaning device through the pipe 29, and for example, a plastic container is used. 44 stores the water stored in the tank 43 and aerates it. For example, it is an aeration tank using a plastic container, and has a built-in porous aeration body that generates air or gas for aeration in the form of bubbles.
Reference numeral 45 is a valve, which is an opening / closing valve provided in a pipe connecting the tank 43 and the aeration tank 44. Reference numeral 46 is a valve, which is an opening / closing valve provided in the drainage pipe of the aeration tank 44. 47 is a pipe, and the main body 34
The exhaust duct connected to the deodorizing port 36 and the aeration tank 44 are communicated with each other, the fan 16 provided in the recovery air duct 19 of the main body 34 is rotated, and the dampers 25 and 26 are opened to externally enter the main body 34. When fresh air is sent, the air exhausted from the deodorizing port 36 of the damper 26 is sent to the porous aeration body.

Next, the operation of the above configuration will be described.

Since the cleaning process is as described above, the wastewater treatment will be described here.

In this device, the tank 43 stores, for example, one-day drainage discharged from the water separator 22 of the main body 34.

The drainage in the tank 43 is transferred to the aeration tank 44 by operating the valve 45 at the end of the day or at the start of the next day.

When the main body 34 is operated with the valves 45 and 46 closed, the waste water separated from the water separator 22 is accumulated in the tank 43,
Further, when the cleaning process is completed, the dampers 25 and 26 are opened to send the outside air into the main body 34 to deodorize. It is supplied to 44 porous aerators to aerate the waste water in the tank and release the solvent gas. As a result, the solvent contained in the stored water in the aeration tank 44 is aerated and evaporated, and the solvent concentration of the stored water becomes extremely small.

At the end of the day or at the start of the next day, drain the drainage from the aeration tank 44 by operating the valve 46 and discharge it.
Operate valve 45 to transfer the drainage inside.

The above operation is repeated to discharge the waste water containing almost no solvent to the outside of the system by aeration.

(Problems to be solved by the invention) By the way, when a granular solvent is present in the wastewater stored in the tank 43, the wastewater is transferred from the tank 43 to the aeration tank 44, and then air or the like is fed into the tank. Even if the gas was supplied and aerated, the granular solvent tended to settle at the bottom of the tank without being destroyed, and a long period of aeration was required to destroy the granular solvent.

The present invention has been made to solve the above-mentioned problems, and the granular solvent contained in the wastewater is separated and removed before the wastewater is transferred to the aeration tank, so that the wastewater can be efficiently aerated efficiently. It is intended to provide a purification device.

(Means for Solving Problems) Therefore, the present invention provides an aeration-type wastewater purification apparatus having a water separator and an aeration tank for removing a solvent contained in wastewater from a dry cleaning apparatus. A safety separator that stores the wastewater from the water separator is installed between the separator and the aeration tank, and the funnel connected to the aeration tank and the funnel are installed at the inlet of the safety separator to the aeration tank. A hydrophilic filter that is detachably attached is built in so that the particulate solvent floating in the drainage does not pass through, and this is a means for solving the problem.

(Function) There is a solvent floating in the drain of the dry cleaner, and when this floating solvent enters the aeration tank, the solvent is precipitated by aeration. In addition, if even one particle of solvent is precipitated in the aeration tank, the solvent will dissolve into the purified water and the amount will not drop below 3 ppm. In the present invention, the wastewater from the water separator is first filtered with a hydrophilic filter and then supplied to the aeration tank, so that the particulate solvent is safely removed from the wastewater sent to the aeration tank, and the wastewater is drained in a short time. The complete purification of is measured.

(Embodiment) The present invention will be specifically described below with reference to an embodiment shown in the drawings.

FIG. 1 shows a typical embodiment of the present invention. In the figure, the parts denoted by the same reference numerals as those in FIG. 5 are substantially the same as the conventional ones. The differences will be mainly described.

This wastewater purifier has a valve 51 at the drainage inlet of the aeration tank 44.
A safety separator 50 is provided via. The safety separator 50 consists of a discharge storage tank and a pipe 49 extending in the same tank, a funnel 48 is attached to the inner end of the pipe 49, and the other end is connected to the valve 51. There is.

A hydrophilic filter 52 is detachably attached to the large-diameter opening of the funnel 48, and a part or all of the hydrophilic filter 52 is immersed in the drainage. The hydrophilic filter 52 has a function of separating the particulate solvent while allowing water to pass therethrough, and is made of, for example, a cloth or non-woven fabric made of hydrophilic fibers such as cotton and rayon.

In the device of the present embodiment, in addition to the above devices, an activated carbon tank 53 connected to the exhaust port of the aeration tank 44 via a pipe 55 is installed. This activated carbon tank 53 is loaded with activated carbon 54,
An open end of a pipe 55 connected to the aeration tank 44 is inserted into the inside of 54. A heater 56 is attached in the middle of the pipe 55 to heat the solvent gas introduced from the aeration tank 44 to the activated carbon tank 53.

Next, its operation will be described.

Since the washing process is the same as that of the conventional example, the treatment of waste water by the waste water purification apparatus of the present invention will be described here.

First, the water is drained from the water separator 22 of the main body 34 to the tank 43,
For example, store drainage for one day.

The drainage in the tank 43 is transferred to the safety separator 50 by operating the valve 45 at the end of the day or at the start of the next day.

In the safety separator 50, wastewater is stored in advance, and the hydrophilic filter 52 is in a state of containing water entirely due to a capillary phenomenon, and while the valve 51 is opened, the hydrophilic filter 52 opens the aeration tank 44 through the hydrophilic filter 52. Drain. As a result, solvent particles are aerated
It is filtered so that it does not go into 44.

When the dry cleaner main body 34 is operated with the valve 45 closed, the waste water separated from the water separator 22 is accumulated in the tank 43.

On the other hand, air is supplied to the porous aeration body of the aeration tank 44,
Aeration of the wastewater inside releases the solvent gas.

In this way, the solvent contained in the stored water in the aeration tank 44 is aerated and evaporated, and the solvent concentration of the stored water becomes extremely small.

The solvent gas released by aeration is sent to the activated carbon tank 53 through the pipe 55, and the activated carbon 54 adsorbs the solvent gas, and only the air containing almost no solvent gas is released. When the solvent gas is sent to the activated carbon tank 53, electricity is supplied to the heater 56 to lower the relative temperature of the solvent gas to, for example, 50% or less, thereby prolonging the intake life of the activated carbon.

At the end of the day or at the beginning of the next day, the drainage in the aeration tank 44 is drained by operating the valve 46 and discharged.

By repeating the above operations, the waste water that is aerated and contains almost no solvent can be discharged to the outside of the system.

If the activated carbon 54 in the activated carbon tank 53 breaks through and the adsorption capacity is lost, the activated carbon 54 is replaced with a new one.

It should be noted that, in the above-mentioned configuration, the above-mentioned operations can be automated by changing the valves 45, 46, 51 to automatic valves and adding a control device provided with a timer or the like.

Further, instead of guiding the solvent gas discharged from the aeration tank 44 to the activated carbon tank 53, it may be guided to an activated carbon solvent recovery device or the like installed on the dry cleaning device main body 34 side.

The funnel 48 preferably has a structure in which the opening into which the hydrophilic filter 52 is loaded has a large area as much as possible, and may have any shape such as a truncated cone shape or a cylindrical shape. Further, as shown in FIG. 2, the funnel 48 may be installed with its opening facing downward.

(Effect of the Invention) There is a floating solvent in the wastewater of the dry cleaner, and when this floating solvent enters the aeration tank, the solvent is precipitated by aeration. In addition, if even one particle of solvent is precipitated in the aeration tank, the solvent will dissolve into the purified water and the amount will not drop below 3 ppm. In the present invention, an aerator for storing and aerating the drainage from the water separator for separating the water contained in the solvent used for cleaning is provided, and the drainage from the water separator is built into the safety separator. Since it is supplied to the aeration tank after being filtered with a hydrophilic filter, the particulate solvent is completely removed, the wastewater is purified, and the groundwater is prevented from being contaminated.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing a typical embodiment of the present invention, FIG. 2 is a configuration diagram of essential parts of another embodiment, and FIG. 3 is a schematic configuration diagram of a conventional dry cleaning device. FIG. 1 is a diagram showing one cycle of the device, and FIG. 5 is a schematic configuration diagram of a conventional wastewater purification treatment device. Description of the main parts of the figure 22 …… Water separator 34 …… Main body 43 …… Tank 44 …… Aeration tank 48 …… Funnel 50 …… Safety separator 52 …… Hydrophilic filter 53 …… Activated carbon tank

Claims (1)

[Scope of utility model registration request] 1. An aeration type waste water purification apparatus having a water separator and an aeration tank for removing a solvent contained in the waste water from a dry cleaning apparatus, wherein the water is separated between the water separator and the aeration tank. A safety separator that stores the wastewater from the separator is provided, and a funnel that connects to the aeration tank and a hydrophilic filter that is detachably attached to the funnel are built into the safety separator at the entrance to the aeration tank. The drain cleaning device of the dry cleaning device is characterized in that the particulate solvent floating in the drain is prevented from passing through.