JPH078989A - Method and apparatus for decolorizing of colored waste water - Google Patents

Abstract

PURPOSE:To provide a method and an apparatus wherein a mixed colored waste water derived from various dyes is decolorized economically without depending on a large-scale installation. CONSTITUTION:A colored waste water and a part of a treated water passed through a tank 2 packed with an anaerobic microorganism-immobilized carrier are circulated into the packed tank 2 through a distribution tank 3 and by introducing into an adjusting tank 1 and a decolorized treated water is obtd. from the distribution tank 3 and if necessary, this treated water can be completely decolorized by introducing additionally it into an aerobic microorganism treating apparatus.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for decolorizing colored wastewater discharged from a dye manufacturing factory or a dyeing factory.

[0002]

2. Description of the Related Art The water discharged from dyestuffs and dyeing factories is not only a mixed solution of different types of dyestuffs, but also has a chromaticity of 100.
Since there is a variation of about 20,000, the conventional decolorization method of colored wastewater, such as the activated carbon adsorption method, the electrolysis method, the microorganism method, etc., cannot be applied as it is. On the other hand, regulations on colored wastewater have become stricter year by year, and recently, it has been required to set the chromaticity to 80 or less (transparency equivalent to distilled water when the discharged water is diluted up to 80 times). For this reason, a huge investment is required in the treatment facility on the factory side.

[0003]

DISCLOSURE OF INVENTION Problems to be Solved by the Invention As a result of various studies and researches on a decolorizing apparatus and method which do not require large-scale equipment and have low operating costs, the present inventors have found that most of the dye components in practical use are anaerobic. The anaerobic microbial treated water is further decomposed by the aerobic microbial treatment even if the soluble organic coloring component present in a relatively large amount in the colored waste water and the dye component not decomposed by the anaerobic microbial are mixed. The present invention was achieved by confirming the fact that almost complete decolorization and confirming that the use of a carrier on which microorganisms are immobilized is effective as means for enabling this to be carried out industrially. .

[0004]

According to the method of the present invention, when the main component of the coloring component in the wastewater is a soluble organic dye,
This is a method in which the colored wastewater is passed in an upward flow through a packed bed of a granular carrier having anaerobic bacteria immobilized on the surface of polymer particles coated with a powdery inorganic substance. In this case, it is effective to recirculate and supply a part of the treated water that has passed through the packed bed to the waste water to be introduced. When the waste water is introduced into the packed bed for a long period of time and the anaerobic pellicle is enlarged and adsorbed on the surface of the carrier, and the pressure loss at the time of introduction of the waste water becomes large, industrial water is passed through and backwashed. When the colored wastewater contains a soluble organic dye and other components which are not decomposed by anaerobic bacteria, it is a method in which water is then passed through a packed fluidized bed of a granular carrier on which aerobic bacteria are immobilized for treatment. In the present invention, the polymer particles constituting the granular carrier are, for example, a granular substance obtained by granulating fully saponified PVA with stirring using water as a binder and coating the surface with fine powder activated carbon (Japanese Patent Publication No. 1-6031).
8). The microorganism-immobilized carrier is one that is adsorbed and immobilized on the inorganic substance coating layer by immersing it in a liquid in which an anaerobic microorganism or an aerobic microorganism is cultured for about one day and night by utilizing the swelling action of the above-mentioned polymer particles due to water absorption. Is.

[0005]

EXAMPLE A biological decolorizing apparatus using a carrier on which anaerobic microorganisms are immobilized according to the present invention is a tank including an adjusting tank 1, an anaerobic microorganisms-immobilized carrier filling tank 2, a distribution tank 3 and a treated water tank 4 as shown in FIG. The colored wastewater and the treated water decolorized in the filling tank 2 are introduced into the adjusting tank 1 from the distribution tank 3 through the reflux pipe 12 into the adjusting tank 1. The mixed water is fed to the lower introduction port 22 of the filling tank 2 by the feed pump 10. The filling tank 2 is provided with a filling tank 21 filled with a granular carrier in which anaerobic microorganisms are immobilized, and an exhaust valve 23 is provided on the upper surface of the tank. Reference numeral 13 is a drain pipe at the time of backwashing. A discharge pipe 24 is connected to the upper portion of the filling tank and serves as a supply pipe to the distribution tank 3. 31 is a treated water conduit, 5
Reference numeral 0 is an industrial water introduction pipe for backwashing, and a pump 5 is used for backwashing.
1, the backwash water is introduced into the inlet 22 of the filling tank 2.
2 is an aerobic biological treatment apparatus connected to the latter stage of the anaerobic biological treatment apparatus shown in FIG. 1, 6 is a three-phase flow tank, and the primary decolorized treated water from the distribution tank 3 is introduced from the upper part. Then
An aerobic microorganisms-immobilized carrier 61 is filled and an aeration means 62 is provided at the bottom. 63 is a blower, 64 is an inclined wall,
65 is a draft plate, 66 is a straightening plate, 67 is a carrier settling section,
68 is a water conduit to the sludge settling tank 7. The settling tank serves to settle and separate sludge generated by bioaggregation of anaerobic microorganisms and aerobic microorganisms. Reference numeral 71 is an overflow pipe, and 72 is a sludge extraction pipe. Reference numeral 8 is a treated water tank, in which the treated water is completely decolorized. In the above apparatus, the water flow rate to the anaerobic carrier packed bed is determined in accordance with the biodegradation rate of the dye contained therein. It is 1-2 Hr. Regarding the water flow rate in the aerobic fluidized bed, in the case of the disperse dye, the experimental value of the residence time in the circulating fluidized bed with the carrier filling rate of about 20% is 0.5 to 1 hr.

[0006]

[Test Example 1] The apparatus of FIG. I. Reactive
Red 120 reactive acid dye wastewater was passed through. The capacity of the filling tank 2 is 100 L (diameter 35 cm, height 120 c
As m), 50 L of the anaerobic microorganisms-immobilized carrier was filled, and the total amount of the dye wastewater and the circulating treated water was supplied at 100 L / Hr. The results of the decolorization treatment are shown in the following table.

[0007]

[Table 1] Dilution degree: Dilution water is used as a control solution, and coloring waste water or decolorized water is diluted with distilled water to obtain transparency equivalent to that of the control solution. Absorbance (1): Absorbance at wavelength of 560 Nm

[0008]

[Test Example 2] The apparatus of FIG. I. Reactive
Red 120 and C.I. I. Disperse Yel
After treating the mixed wastewater of low disperse dye under the same conditions as in Test Example 1, the volume of the three-phase flow tank 6 in FIG. 2 was set to 12.5 L, and 5 L of aerobic microorganism-immobilized carrier was filled to correspond to the dye wastewater. A quantity of anaerobic treated water was supplied. The results of the decolorization treatment are shown in the following table.

[0009]

[Table 2] Absorbance (2): Absorbance at a wavelength of 403 Nm

[0010]

[Effects] According to the present invention, the coloring wastewater with the soluble dye can be efficiently decolorized by the apparatus and method of FIG. 1, and the mixed coloring wastewater with various dyes and the like also has the apparatus and method of FIG. As a result, a remarkable decolorizing ability that cannot be expected by the conventional method can be exhibited. In the present invention, the microbial membrane adheres to the granule carrier to thicken it, or when other contaminants adhere to it, it can be easily regenerated by backwashing so that the running cost can be reduced and it is extremely economical compared to conventional equipment. A decolorizing device can be provided.

[Brief description of drawings]

FIG. 1 is a schematic diagram of an anaerobic microbial decolorization treatment apparatus.

FIG. 2 is a schematic diagram of an aerobic microbial decolorizing device installed in the latter stage of the device of FIG.

[Explanation of symbols]

 1 Waste water and treated water Partly circulating water mixed water storage tank 2 Anaerobic microbial immobilization carrier filling tank 3 Distribution tank 6 Aerobic carrier filling three-phase flow tank 7 Sedimentation tank

Front page continuation (72) Inventor Nobumine Shinbo 2-16-3 Hatchobori, Chuo-ku, Tokyo Denka Engineering Co., Ltd. (72) Inventor Shuzo Fujii 2-16-3 Hatchobori, Chuo-ku, Tokyo Denka Engineering Co., Ltd. (72) Inventor Yasuhiko Miyoshi 2-9-10 Kita-cho, Jindaiji, Chofu-shi, Tokyo House 101, Nakayama

Claims (4)

[Claims] 1. An apparatus in which an adjusting tank, a filling tank filled with an anaerobic microorganisms-immobilized carrier and a distribution tank are connected to each other, the colored waste water in the adjusting tank and a part of the treated water from the distribution tank are reflux water. A method for decolorizing colored wastewater, characterized in that the mixed liquid is passed as an upward flow to the lower inlet of the filling tank. 2. An apparatus comprising a regulating tank, a filling tank filled with an anaerobic microorganisms-immobilized carrier, a distribution tank, and a three-phase flow tank filled with an aerobic microorganisms-immobilized carrier, which are connected in series. Colored wastewater and a part of the treated water from the distribution tank are mixed as reflux water in the adjustment tank, and the mixed liquid is passed as an upward flow to the lower inlet of the filling tank, and the treated water of the distribution tank is also supplied. A method for decolorizing colored wastewater, characterized in that the decolorizing treatment is carried out by passing water through the three-phase flow tank. 3. A coloring formed by connecting a regulating tank, a filling tank filled with an anaerobic microorganisms-immobilized carrier and a distributing tank in series, and arranging a reflux pipe from the distributing tank to the adjusting tank. Waste water decolorizing device. 4. An adjusting tank, a filling tank filled with an anaerobic microorganisms-immobilized carrier, a distribution tank, and a three-phase flow tank filled with an aerobic microorganisms-immobilized carrier are connected in series, and the distribution tank is used to A decolorizing device for colored wastewater, which comprises a circulation tank arranged in an adjusting tank.