JPH0796112B2 - Wastewater purification equipment - Google Patents

Description

TECHNICAL FIELD The present invention relates to a purification device for wastewater discharged from, for example, a dry cleaning factory.

[Conventional technology]

For example, dry cleaning plants use organic solvents such as turpentine oil, tetrachloroethylene (commonly known as Perklo) and 1,1,1-trichloroethane (commonly known as ethane), and these organic solvents are recovered by various methods and equipment. However, a minute amount thereof is dissolved or mixed in the waste water of the factory and discharged from the factory.

In the above organic solvents, especially tetrachloroethylene and 1,1,1-
Since trichloroethane has recently been designated as a harmful substance that pollutes groundwater, treatment of wastewater containing it has become an extremely important issue in dry cleaning plants and the like. Therefore, for example, in dry cleaning factories, etc., tetrachloroethylene and 1,1,1-
The wastewater containing trichloroethane is temporarily stored in the purified soda, and air is sent to the purified soda to aerate it so that the tetrachloroethylene or 1,1,1-trichloroethane is discharged from the wastewater into the atmosphere and then discharged. ing.

[Problems that the invention is trying to solve]

The above conventional purifying soda is
It is possible to reduce the concentration of 1,1,1-trichloroethane to just below 0.1 ppm, which is the standard currently applied for wastewater discharged from dry cleaning plants, etc. Is exhibited in a satisfactory state, for example, if the amount of air for the above aeration is insufficient, or if dirt adheres to the inside of the caustic,
The above-mentioned capacity is lowered, and therefore, there has been a problem that frequent maintenance is required in order to bring the concentration of tetrachloroethylene or 1,1,1-trichloroethane in the wastewater to a standard value or less.

The present invention eliminates the above-mentioned disadvantages of the prior art, and tetrachloroethylene and 1,1,1-trichloroethane in wastewater are
It is possible to make the concentration much lower than the standard value, and moreover,
It was made for the purpose of providing a wastewater purification device that does not require frequent maintenance.

[Means for solving problems]

In order to achieve the above object, the structure adopted by the present invention is a soda for storing waste water, a gas releasing means provided near the lower part of the soda, and a heating provided near the lower part of the soda. And far-infrared ray generating means arranged above the gas discharging means.

In the above configuration, the far infrared ray generating means is made of bioceramic or is provided with a plurality of sodas for storing drainage,
The wastewater treated with one soda may be sequentially introduced into other soda.

[Operation of the invention]

In the present invention, since the waste water stored in the soda is aerated by the gas releasing means provided in the soda, it is heated by the heating means provided in the soda to give thermal energy. , Tetrachlorethylene or 1,1,1 in the wastewater
-It becomes possible to effectively reduce the concentration of an organic solvent such as trichloroethane.

Further, in the present invention, since the far infrared ray generating means, particularly the bioceramic is arranged above the gas releasing means, the far infrared ray generating means is not limited to the internal combustion chamber, even if the detailed mechanism is unclear. It is possible to make maintenance free by preventing dirt from adhering to.

Furthermore, when a plurality of sodas for storing wastewater are provided and the wastewater treated with one soda is successively introduced into other sodas,
Since the wastewater is repeatedly subjected to the above treatment, it becomes possible to further reduce the concentration of the organic solvent such as tetrachloroethylene or 1,1,1-trichloroethane in the wastewater.

[Examples] The present invention will be described in more detail below with reference to the drawings.

The figure shows an example of implementation of the purifying device of the present invention with a conceptual side view.

In the figure, reference numeral 1 denotes a sulfur which is discharged from a dry cleaning plant or the like and stores waste water containing an organic solvent such as tetrachloroethylene or 1,1,1-trichloroethane. The partition plate 2 arranged in the partition divides the first soda 1a and the second soda 1b. The soda 1 may be a single soda, not divided by the partition plate 2 as shown in the figure.

3 is a laterally inverted L-shaped drainage introduction pipe erected in the central portion of the first soda 1a, 4 is a connecting pipe attached to the partition plate 2 on the second soda 1b side so as to penetrate therethrough, 5 is a discharge pipe attached to the second soda 1b penetrating it.
The lower ends of the drainage introduction pipe 3 and the connecting pipe 4 are respectively located near the bottoms of the first and second soda 1a and 1b,
Therefore, as shown in the figure, the wastewater introduced from the wastewater introduction pipe 3 first flows from the lower part to the upper part of the first caustic 1a, and then is guided to the second caustic part 1b by the connecting pipe 4. After all, the second caustic 1b flows from the bottom to the top and is finally discharged from the discharge pipe 5 to the outside of the apparatus.

Reference numeral 6 is an aeration pipe arranged near the lower part of the soda 1 as a gas releasing means, and if air is supplied from the end 6a of the pipe, air will be supplied from a hole 6b formed in the upper surface of the soda 1. Is released, and it is possible to do a dash.

Reference numeral 7 is a steam pipe as a heating means disposed near the lower part of the above-mentioned soda 1, and if steam is supplied from the end portion 7a,
The heat allows the waste water in the soda 1 to be heated, and the heating temperature is, for example, in the range of 20 to 30 ° C.

Incidentally, as the gas for the aeration, a part of the output of the air compressor which is commonly installed in a dry cleaning factory or the like is diverted, and as the steam for heating, it is used in a dry cleaning factory or the like. If part of the output (so-called drain) of the existing steam generator is diverted, it is simple and cost effective.

Further, 8 is a thermometer installed in the caustic so as to monitor the temperature of the wastewater, and 9 is an exhaust port for discharging the organic solvent released from the wastewater to the outside of the apparatus.

In an example of the device of the present invention configured as described above,
The waste water stored in the caustic 1a is heated by the steam pipe 7 arranged in the caustic when the gas discharged from the aeration pipe 6 is aerated. When bubbles due to the gas burst on the upper surface of the, it becomes easier to release the organic solvent such as tetrachloroethylene or 1,1,1-trichloroethane in the wastewater, and as a result, the concentration of these organic solvents can be effectively reduced. .

Further, since the soda 1 for storing the wastewater is separated and the wastewater treated with the soda 1a is introduced into the soda 1b, the wastewater is repeatedly subjected to the above-mentioned aeration-heat treatment, and tetrachloroethylene in the wastewater is discharged. It is possible to further reduce the concentration of the organic solvent such as 1,1,1-trichloroethane.

Actually, when the wastewater was treated by the purification device having the above-mentioned configuration, it was confirmed that tetrachlorethylene and 1,1,1
-It was possible to reduce the concentration of trichloroethane to a level below 0.1 ppm, which is the currently applied standard for wastewater discharged from dry cleaning plants, for a long time.

Thus, the device of the present invention has the following configuration in addition to the above configuration.

That is, a bioceramic as a far infrared ray generating means is arranged above the aeration pipe 6.

Recently, this bioceramic has been attracting attention as one that exhibits various effects, and its main components are silica, alumina, ferric oxide, titanium oxide, etc. After being molded into a tile shape and provided with an appropriate number of through holes, a fine powder of natural ore is coated and sintered at about 1,300 ° C., which is installed in an appropriate number of 10 in the lateral direction.

The bioceramic used in the present invention is 7.6 to 1
It is known to generate far-infrared rays of 3 microns.

In the purifying apparatus of the present invention configured as described above, the wastewater in the soda 1 is subjected to the aeration-heat treatment as described above, but even if there is an unclear part of the detailed mechanism, the bioceramic Suppresses the odor of wastewater and prevents dirt from adhering to the inside of the soda, and by making the components of the wastewater inside the soda uniform, it can be maintenance-free and exert its initial capacity over a long period of time. be able to.

Actually, when the wastewater was treated by the above-described purification apparatus of the present invention, tetrachlorethylene and 1,1,1 in the wastewater were treated.
-The concentration of trichloroethane can be reduced to 0.006 ppm, which is much lower than 0.1 ppm, which is the standard currently applied for wastewater discharged from dry cleaning plants, for a long period of time. Almost no dirt was attached.

The above concentration is. It was performed by solvent extraction / gas chromatography according to the method specified in JIS K 0125. The concentration of the raw water at that time was 62 ppm.

〔The invention's effect〕

As described above, according to the purification apparatus of the present invention, the concentration of the organic solvent in the wastewater can be reduced to a level far below 0.1 ppm which is the standard applied at the present time, and can be reduced for a long period of time. It is possible to prevent the stains inside from adhering to the inside, which is a great contribution to environmental protection.

Further, as described above, since the purifying device of the present invention has a high processing capacity, it is possible to drastically reduce its operating time.
It is also economical.

[Brief description of drawings]

FIG. 1 is a side view conceptually showing an example of implementation of the purifying device of the present invention. 1 ... Cao, 2 ... Partition plate 2, 3 ... Wastewater introduction pipe,
4 ... Connection pipe, 5 ... Discharge pipe, 6 ... Aeration pipe, 7 ... Steam pipe, 8 ... Thermometer, 9 ... Exhaust port, 10 ... Bioceramic

Claims (3)

[Claims] 1. Storm for storing waste water, gas releasing means disposed near the lower portion of the sulfur, heating means disposed near the lower portion of the sulfur, and above the gas releasing means. A device for purifying wastewater, comprising a far-infrared ray generating means provided. 2. The waste water purifying apparatus according to claim 1, wherein the far infrared ray generating means is bioceramic. 3. The waste water purifying apparatus according to claim 1, further comprising a plurality of sodas for storing the waste water, wherein the waste water treated with one soda is sequentially introduced into another.