JP3427044B2 - Method and apparatus for cleaning air conditioning filter - Google Patents

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 filter that has been contaminated by the use of an air conditioner installed in a tollgate of a highway or a building, a method for treating cleaning wastewater, and a cleaning and wastewater treatment apparatus.

[0002]

2. Description of the Related Art An air conditioner installed in a tollgate of a highway removes soot dust, floating soot dust, etc., emitted from a vehicle included in the intake air, and supplies clean air to the room. Five to six filters are used in a stack.
Depending on the traffic volume, these filters become very dirty over time, and eventually clean air cannot be supplied indoors.

Therefore, a dirty filter will last for 1 week
It is cleaned every 0 days or 1 month and replaced with a clean filter. The filters of building air conditioners are also polluted every few months because they are contaminated by the removal of suspended dust.

Further, the wastewater used for cleaning the filter contains fine particles such as carbides and dust, and it is often a problem from the viewpoint of preventing water pollution to discharge the wastewater as it is to sewage or rivers. . Therefore, it is the current situation that water is discharged after performing wastewater treatment to remove fine particles to a level below the regulation value.

The following methods are generally known as conventional cleaning methods for these filters. (A) A method of washing by rubbing or stepping while tap water or high-pressure water is applied, and (a) Putting a few filters in an inner cylinder rotary washing machine having a large number of holes, while rotating the inner cylinder, It is a method of washing by ejecting high-pressure water from the central portion, and (c) a method of putting a filter in a washing tank in which an ultrasonic oscillator is installed and washing while operating the ultrasonic oscillator.

[0006]

Each of the conventional techniques has the following problems to be solved.

In the method (a), the cleaning effect is poor due to hand rubbing or stepping, and not only long-time work is required, but also fine particles agglomerated inside the filter cannot be sufficiently removed. In addition, since the filter is rubbed or stepped on, it is frequently deformed during cleaning, and deterioration due to damage to the filter is severe, resulting in a short service life. In addition, since the amount of water used is large, it is separately stored in a wastewater treatment tank for treatment.

The treatment of the washing wastewater is carried out by using polyaluminum chloride.
(PAC) and polymer flocculant are added appropriately, and flocculated particles are removed by sedimentation filtration. However, since the particles adhering to the filter are very fine particles, the filter medium clogs quickly and filtration cannot be performed. Therefore, it is necessary to replace the filter media again and again, and the wastewater treatment work also takes a long time. Therefore,
The labor cost for cleaning and wastewater treatment is high, and the cleaning cost for all filters is much higher than other methods.

In the method (a), when the filters are put in the inner cylinder so as to overlap with each other, the dust dropped from the previous filter reattaches and agglomerates, and the cleaning efficiency is inferior to that of stepping and rubbing. Therefore, only a few filters can be inserted at a time so that the individual filters do not overlap the inner wall surface. Therefore, it takes a long time to wash a large amount of filters. In addition, since cleaning is performed along the inner wall surface of the inner cylinder by rotation, deterioration (damage) due to deformation is severe and the service life is shortened, as in the method (a). In addition, the amount of water used is large, and is separately stored in a wastewater treatment tank for treatment.

The treatment of the cleaning wastewater is similar to the method (a), and the clogging of the filter material becomes a problem. Therefore, it is filtered by adding a filter aid. However, when a large amount of filter aid is added, there is a drawback that the amount of solid waste is large. Therefore, the addition amount is determined in consideration of the replacement frequency of the filter medium.
At present, the filter media is replaced again and again, and the wastewater treatment work requires a long time. Therefore, this method also has the disadvantage that, like the method (a), the labor cost required for cleaning and wastewater treatment work is high, and the cleaning treatment cost for all filters is much higher than other methods.

In the method (c), there is proposed a cleaning tank equipped with an ultrasonic transducer, a rinsing tank, and a wastewater treatment tank. In this method, first, a dirty filter is immersed in water in which ultrasonic waves are flowing, and is washed by using energy for eliminating fine bubbles generated by ultrasonic waves. afterwards,
After rinsing in a rinsing tank, dry. The washing wastewater is treated by a dedicated wastewater treatment device.

The ultrasonic cleaning method is generally well known. However, the attenuation of ultrasonic energy is large depending on the distance from the ultrasonic transducer in the vertical direction and the horizontal direction, the inside of the filter, and the distance between the filters. For this reason, the cleaning effect is very poor as compared with other methods, and it is not possible to clean a large number of filters in a small tank or in a short time. If a large number of filters are to be washed in a short time, an expensive large ultrasonic wave generator that starts high energy, a large washing tank, and a large wastewater treatment tank that accompanies an increase in washing water are required. Therefore, not only does the price of the device increase due to the increase in size of the device,
There is a drawback that a large area is required for installing the device, and power consumption cost, wastewater treatment cost, etc. are high.

[0013]

SUMMARY OF THE INVENTION The present invention comprises an effective cleaning process in which a large number of filters are cleaned in a short time and hardly damaged or deteriorated by cleaning, and a process in which waste water can be easily treated in a short time. It is intended to provide a compact and inexpensive device that can be used as a common tank for cleaning methods for air conditioning filters, including cleaning, rinsing, and wastewater treatment.

That is, the present invention is configured as follows. The step of immersing the dirty filter of the air conditioner in the washing water for a predetermined time while continuously or intermittently vibrating, and pulling up and holding a part and / or the whole of the filter from the washing water and keeping it constant in the washing water again. Repeat the step of dipping for a predetermined number of times, pull out from the washing water and rinse with rinsing water, and add polyaluminum chloride (PAC) and a polymeric flocculant to the wastewater that has washed the filter to flocculate suspended particles. And a step of applying an electric current to an electrode for electrolytic levitation installed at the bottom of the tank, causing the aggregates to float on the water surface by bubbles generated from the surface of the electrode, forming a floss, and scraping and removing the floss. There is provided a method for cleaning an air conditioning filter, including:

In the treatment of waste water after washing the filter, the addition amount of polyaluminum chloride (PAC) is 10% Al ₂ O _3.
~ 100 mg / l, the amount of polymer flocculant added is 0.1 ~ 1.0 mg / l,
The current density when floating suspended particles is 1 A / dm ² to 10 A / DC current.
It is preferably dm ² .

Further, the present invention is directed to a wire netting cassette containing the above filter, a filter insertion frame with a vibrator into which the wire netting cassette can be inserted, a dipping / pulling device capable of raising and lowering the filter insertion frame, and a shower nozzle for rinsing. And a chemical liquid tank for injecting the chemical for wastewater treatment, an electrolytic levitation device electrode and a rectifier for levitating the floss, a floss scraping device for scraping the floated floss, and a cleaning tank for both cleaning and wastewater treatment. A cleaning device for an air conditioning filter and a wastewater treatment device are provided.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings. It should be noted that these embodiments do not limit the present invention. 1 is a plan view showing the cleaning apparatus of the present invention, FIG. 2 is a front view showing the cleaning apparatus of the present invention, FIG. 3 is a side view showing the cleaning apparatus of the present invention, and FIG. 4 is a filter insertion of the present invention. A plan view (a), a front view (b), and a side view (c) of the frame are shown. The same members are designated by the same reference numerals.

The apparatus of the present invention comprises a wire mesh cassette 20 for storing a filter and a filter insertion frame 19 with a vibrator 21 into which the wire mesh cassette 20 can be inserted.
An immersion / pulling device 2 capable of raising and lowering a filter insertion frame, a rinsing nozzle 18, a chemical liquid tank 23 for injecting a chemical for wastewater treatment, an electrolytic levitation device electrode 17 for levitation of suspended particles, and a rectifier, A cleaning and wastewater treatment device for an air-conditioning filter, characterized in that it comprises a froth scraping device 9 for scraping the floating floss, and a cleaning tank 1 for both cleaning and wastewater treatment. Although the cleaning process and the wastewater treatment process can be performed by separate devices, the present invention provides a device for performing the cleaning and the wastewater treatment in one tank.

First, the cleaning process will be described. The wire mesh cassette 20 that holds the filter is of a size that can hold 4 to 5 filters in one cassette.
A wire mesh for transmitting vibration is provided between the filters. A plurality of the wire mesh cassettes 20 are inserted into the filter insertion frame 19 with the vibrator 21.

According to a preferred embodiment of the present invention, the filter 24 inserted in the wire mesh cassette 20 is immersed in washing water with the surface in the thickness direction facing upward.

The filter insertion frame 19 with the vibrator 21 is a dipping / pulling device 2 which can raise and lower the frame.
Are linked to. The dipping and lifting device 2 during cleaning
By driving the drive chain 8, the sprocket 4, and the chain 7 by the motor 3, the raising and lowering can be repeated.

The cleaning of the filter 24 in the cleaning step is performed continuously by vibrating the insertion frame 19 accommodating the filter 24 by the vibrator 21, or intermittently only during immersion. When the filter is pulled up in a vibrating state, the aggregated particles inside the filter are decomposed by the vibration,
It becomes fine particles and is discharged in a short time as the cleaning water in the filter falls and flows out.

Preferably, with the filter vibrated,
Repeat the step of soaking for 3 to 10 seconds and the step of pulling up for 3 to 10 seconds. This step enables efficient cleaning without deteriorating a large amount of filters in a short time.

If necessary, 0.01 to
The washing efficiency can be further increased by adding 0.1 wt% of detergent. As the detergent, a commercially available neutral detergent or an alkaline detergent can be used.

When the cleaning is completed, the immersing and pulling device 2 is stopped in the raised state, and the shower nozzle 18 for rinsing is used.
Rinse by rinsing with water. Rinse water is 0.
The spraying is preferably performed at a water pressure of 1 to 0.3 mPa, but not limited to this and can be set to an appropriate value depending on the filter to be washed. The rinsed water is dropped into the wash tank 1. After cleaning, the filter is a wire mesh cassette 20.
Each time it is removed from the filter insertion frame 19 and dried.

Subsequently, the wire mesh cassette 20 containing the dirty filter is inserted into the filter insertion frame 19 and the washing process is repeated several times, and the washing operation is performed when the suspended particles in the washing water exceed a predetermined concentration. Stop and dispose of cleaning wastewater. The predetermined concentration is 400-600 mg / l.

Next, the wastewater treatment process will be described. The treatment of the cleaning wastewater is carried out by cleaning the filter accumulated in the cleaning tank 1 into the cleaning wastewater from the chemical liquid tank 23,
Poly aluminum chloride (PAC) as Al ₂ O ₃ 10-100 mg / l
(500-1000 ppm on a commercial 8% stock solution basis), preferably 40
~ 80 mg / l, polymer flocculant 0.1-1.0 mg / l, preferably
Add 0.25-0.5 mg / l and hold for a predetermined time.

As the polymer coagulant, an anionic polymer coagulant such as polyacrylamide can be used, but the polymer coagulant is not limited thereto.

After aggregating the suspended particles, the power of the rectifier of the control plate 22 is turned on, and 1 A / dm ² to 10 A / dm ^{2 of the} electrolytic levitation device electrode 17 installed at the bottom of the cleaning tank 1 is preferable. Carries a current of 2.5 A / dm ^{2 to} 5 A / dm ² . The current is preferably direct current, but is not limited to this.

Electrolytic levitation gas is generated from the surface of the electrode 17 of the electrolytic levitation device, and the bubbles cause the aggregates of suspended particles to float to the water surface.

The floss that has floated up is taken up by the floss scraping device 9
The floss scraping drive motor 11 is driven to actuate the floss scraping plate 12 and the scraping drive chain 13 to scrape the floss collecting container (floss receiving tank 14).
The scraped floss is discharged from the floss discharge port 16.

According to the wastewater treatment method of the present invention, the concentration of suspended particles in the filter washing wastewater is reduced to 150 mg / l, and the washing wastewater is easily treated to a quality such that it can be discharged to rivers and the like.

In the method of the present invention, the washing and the wastewater treatment can be carried out by different apparatuses, but the apparatus of the present invention shown in FIGS. 1 to 4 can perform the washing and the wastewater treatment in the same tank. It is a one-tank type cleaning device.

When the apparatus of the present invention is used as a cleaning tank, the dipping / pulling-up device 2 is used to make the wire mesh cassette 20.
The filter 24 put in the container is soaked or pulled up together with the filter insertion frame 19, and the vibrator 2
Run 1 to wash.

When the apparatus of the present invention is used as a wastewater treatment tank, a chemical solution for treating wastewater is injected from the chemical solution tank 23 into the tank, and an electric current is applied to the electrolytic levitation device electrode 17 provided at the bottom of the cleaning tank 1. The floated floss is scraped into the floss receiving tank 14 by operating the floss scraping device 9.
Treated water is discharged or reused.

[0036]

EXAMPLES Next, embodiments of the present invention will be described based on examples. However, the following description does not limit the present invention.

Table 1 shows Examples 1 to 23 relating to the cleaning method of the present invention.

[0038]

[Table 1]

The cleaning apparatus shown in FIGS. 1 to 4 was used for cleaning according to the above-mentioned method. 30 l of water was put into a 300 mm × 300 mm × 400 mm washing tank, 0.1 wt% of a commercially available alkaline detergent was dissolved, and the washing was repeated 100 times with a dipping time of 5 seconds each and a pulling time of 5 seconds each. A 20 W vibrator attached to the filter insert was vibrated continuously or intermittently throughout the entire wash time. In this example, using a filter of 300 mm × 250 mm as a sample for washing, to determine the weight loss after drying, what was obtained as wt% of the weight before washing, the amount of deposits of the filter shown in Table 1 Is.

From the results shown in Table 1, as the detergent, a commercially available alkaline detergent or a commercially available neutral detergent can be used. In the examples, Lion's top (trade name) was used as the alkaline detergent, and Mama Lemon (trade name) of Lion was used as the neutral detergent. Moreover, the proper detergent amount is 0.01 to 0.1 wt%.

The immersion time and pulling time are preferably
It is 3 seconds to 10 seconds, but is not limited thereto and can be set to an appropriate range. The number of repetitions of immersion and withdrawal can be appropriately changed depending on the target of the cleaning rate, but 20 to 40 times is preferable. Further, comparing the cleaning rate between the continuous vibration by the vibrator and the intermittent vibration that vibrates only during immersion, the cleaning rate when the continuous vibration is performed is slightly higher.

By washing under these appropriate conditions,
A cleaning effect of 85 to 97% could be obtained. These values are greatly increased as compared with the conventional method.

Table 2 shows the results of Examples 24 to 34 relating to the wastewater treatment method of the present invention.

[0044]

[Table 2]

In the wastewater treatment test of Table 2, the washing apparatus shown in FIGS. 1 to 4 was used to wash the filter of the air conditioner of the highway tollgate, and the wastewater with SS concentration of 500 mg / l before the wastewater treatment was washed. Was prepared and used for the test.

The wastewater treatment test was carried out by using an electrolytic levitation wastewater treatment test apparatus in which an electrolytic levitation device electrode for generating an electrolytic levitation gas was installed at the bottom of a container capable of treating 1000 ml of wastewater. As shown in Example 24 in Table 2, when polyaluminum chloride is not added, the agglomeration of suspended particles becomes insufficient, and the SS concentration of treated water does not decrease sufficiently.
Addition amount of polyaluminum chloride is 10 to 100 mg / l, addition amount of polymer flocculant is 0.1 to 1.0 mg / l, electrolytic levitation current density is 1
In the condition range of up to 10 A / dm ² , suspended particles can be electrolytically floated and separated below the water discharge regulation value to rivers in a short time.

From these results, the SS concentration of the treated water was determined by operating the apparatus of the present invention under the above conditions.
It could be reduced to 10 to 100 mg / l.

[0048]

INDUSTRIAL APPLICABILITY The present invention can provide a method and an apparatus capable of cleaning a filter for a highway tollgate or a building air conditioner in a short time without deteriorating the wastewater and easily treating the wastewater in a short time. , Its technical and economic value is very large.

[Brief description of drawings]

FIG. 1 is a plan view showing a cleaning device of the present invention.

FIG. 2 is a front view showing a cleaning device of the present invention.

FIG. 3 is a side view showing a cleaning device of the present invention.

FIG. 4 is a diagram showing a plan view (a), a front view (b), and a side view (c) of a filter insertion frame of the present invention.

[Explanation of symbols]

1 washing tank 2 Immersion and pulling device 3 motor 4 sprockets 5 shafts 6 Drive sprocket 7 chains 8 drive chain 9 Floss scraping device 10 shaft 11 Floss scraping drive motor 12 Floss scraping plate 13 Scraping drive chain 14 Floss receiving tank 15 drain 16 floss outlet 17 Electrolytic levitation device electrode 18 Rinsing nozzle 19 Filter insertion frame 20 wire mesh cassette 21 vibrator 22 Control panel 23 Chemical tank 24 filters

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁷ Identification code FI C02F 1/465 C02F 1/46 102 1/56 ZAB (72) Inventor Shigeo Hasegawa 1-20-24 Kanon-cho, Nishi-ku, Hiroshima-shi, Hiroshima No. Ryomei Giken Co., Ltd. (72) Inventor Seiji Nomura 1-20-24 Kannon-cho, Nishi-ku, Hiroshima-shi, Hiroshima Ryomei Giken Co., Ltd. (72) Inc. 1-20 Kannon-cho, Nishi-ku, Hiroshima-shi, Hiroshima No. 24 Ryomei Giken Co., Ltd. (72) Inventor Masao Shinoda 14-1 Nihonbashi Odenmacho, Chuo-ku, Tokyo Highway Toll System Co., Ltd. (72) Kazuo Matsunaga 14-1 Nihonbashi Odenmacho, Chuo-ku, Tokyo Highway Toll System Co., Ltd. (56) Reference JP 2000-176222 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) B01D 41/00-41/04

Claims (3)

(57) [Claims] 1. A dirty filter of an air conditioner is continuously
Alternatively, a step of immersing the filter in the wash water for a predetermined time while intermittently vibrating, and a step of pulling a part and / or the whole of the filter out of the wash water and holding it and immersing it again in the wash water are repeated a predetermined number of times. , Withdraw from the washing water and rinse with rinsing water.
(PAC) and a chemical for treating wastewater containing a polymer flocculant, a step of aggregating suspended particles, and applying an electric current to the electrolytic levitation electrode installed at the bottom of the tank,
A method of cleaning an air-conditioning filter, comprising the steps of floating the aggregate on the water surface by bubbles generated from the surface of the electrode to form floss, and scraping and removing the floss. 2. In the treatment of the waste water after washing the filter, the addition amount of polyaluminum chloride (PAC) is 10 to 100 mg / l as Al ₂ O ₃ , and the addition amount of the polymer flocculant is 0.1 to 1.0 m 2.
g / l, current density when floating suspended particles is 1 A / dm ² ~ DC current
The method for cleaning an air-conditioning filter according to claim 1, wherein the method is 10 A / dm ² . 3. A wire mesh cassette containing the filter, a filter insertion frame with a vibrator into which the wire mesh cassette can be inserted, a dipping and lifting device capable of raising and lowering the filter insertion frame, a shower nozzle for rinsing, and the waste water. A chemical liquid tank for injecting treatment chemicals, an electrolytic levitation device electrode and a rectifier for floating the above-mentioned floss, and a floss scraping device for scraping the floated floss,
A washing and wastewater treatment device for an air-conditioning filter, comprising a washing tank commonly used for washing and wastewater treatment.