JPH02131184A - Drain treatment device - Google Patents

Abstract

PURPOSE:To prepare always stabilized treated water of low concentration by providing an adsorption treatment means of an organic halogenated component by utilizing active carbon and a desorption means for the same by means of hot air. CONSTITUTION:Drain 1 including an organic halogenenated component is aeration treated in an aeration tank 2 by means of air exhausted out of an air dispersion mechanism 4 connected with an air feeding device 3 such as a blower or the like, and simultaneously adsorption treated by means of active carbon 51 constituted on the surface of a rotating drum 5 installed in the aeration tank 2. The drain 1 aeration treated and adsorption treated is discharged as treated water 8. On the other hand, the organic halogenated component in the drain adsorption treated by active carbon 51 is evaporated by hot air discharged out of a hot air dispersion mechanism 6 through a heater 7 connected with the air feeding device 3 and desorption treated continuously without saturation. Drain gas 9 including the generated organic halogenated component is recovered by a solvent recovery treatment device or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a wastewater treatment device for purifying wastewater containing organic halogen compounds.

[Conventional technology]

Conventionally, this type of wastewater treatment equipment has widely utilized aeration treatment for the purpose of purifying wastewater. In addition, combustion treatment, catalytic combustion treatment, etc. are also performed for detoxification treatment.

[Problem to be solved by the invention]

Currently, large amounts of organic solvents such as trichlorethylene and tetrachlorethylene are used in the electronics industry, precision industry, etc., and the wastewater discharged from factories involved in these fields contains the organic solvents mentioned above. many.

However, in order to purify these wastewaters, the conventional wastewater treatment equipment described above uses aeration treatment, which has a low treatment cost, so the trichlorethylene contained in the wastewater,
Although it is possible to aerate tetrachlorethylene, etc., the disadvantage is that if the concentration of influent water fluctuates greatly, it is difficult to improve the treatment effect by always obtaining treated water with a stable low concentration after aeration treatment. There is.

Therefore, there are methods to detoxify wastewater containing these organic halogen compounds through combustion treatment, catalytic combustion treatment, etc., but in this case, the equipment cost is high. It has a drawback in terms of processing cost.

[Means to solve the problem]

The wastewater treatment apparatus of the present invention purifies wastewater containing organic halogen compounds, and includes an adsorption treatment means for adsorbing the organic halogen compound with activated carbon while aerating the wastewater; and a desorption means for desorbing the organic halogen compound adsorbed on the activated carbon.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention.

In FIG. 1, this embodiment is equipped with an aeration tank 2 for storing and aerating wastewater 1 containing organic halogen compounds such as trichlorethylene and tetrochlorethylene.
Inside, there is an aeration mechanism 4 that sends air into the aeration tank 2, a rotary drum 5 that has an activated carbon 51 on its surface that adsorbs organic halogen compounds, and that is fixed at approximately the center of the aeration tank 2 and rotates. It has a hot air diffuser [6] that desorbs the adsorbed organic halogen compounds with hot air, and outside the aeration tank 2, air is sent to the aeration mechanism 4, and hot air is passed through the hot air diffuser ellipse 6 through the heater 7. It has an air supply device 3 that sends air.

Next, the operation of this embodiment will be explained.

In Fig. 1, wastewater 1 containing organic halogen compounds such as trichlorethylene and tetrachloroethylene is first aerated in an aeration tank 2 by air released from an aerator 4 connected to an air supply device 3 such as a blower. At the same time as being treated, the activated carbon 51 formed on the surface of the rotating drum 5 installed in the aeration tank 2 performs an adsorption treatment. The waste water 1 that has been subjected to the aeration treatment and the adsorption treatment is discharged as treated water 8.

On the other hand, the organic halogen compounds in the wastewater adsorbed by the activated carbon 51 are evaporated by the hot air released from the hot air diffuser 6 through the heater 7 connected to the air supply device 3 such as a blower, and become saturated. It is continuously attached and detached.

Next, an example in which wastewater treatment is performed using the wastewater treatment apparatus of this embodiment will be described.

900 mg/I! Waste water 1 containing trict ethylene at a concentration of
When the adsorption treatment is performed using 5 liters of activated carbon formed on the surface of the rotary drum 5 installed in the aeration tank 2 while performing aeration treatment with an air amount of 85 NmS/H, the treated water 8 after the aeration treatment and the activated carbon adsorption treatment is The concentration of tricloethylene in it is 0.
01 mg/iI or less.

On the other hand, the organic halogen compounds in the wastewater adsorbed by the activated carbon 51 formed on the surface of the rotating drum 5 are removed from the hot air diffuser 6 by a heater 7 connected to an air supply device 3 such as a blower.
Since the activated carbon 51 is desorbed by the hot air released through the activated carbon 51, continuous processing is possible without saturation.

When the wastewater treatment apparatus of this embodiment is used, the concentration of trichlorethylene in the wastewater is 0.01 mg/(l
The management target value for controlling drainage into public water bodies is 0.3 mg/(l), and the management target value for preventing underground seepage is 0.03 mg/47.
You can deal with the following:

Incidentally, the exhaust gas 9 containing organic halogen compounds generated in this embodiment is recovered and treated by a solvent recovery treatment device or the like.

〔Effect of the invention〕

As explained above, the present invention includes an organic halogen compound adsorption means and an organic halogen compound desorption means from the adsorption means, thereby converting wastewater containing organic halogen compounds into stable treated water with a lower concentration than before. There are effects that can be treated.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the present invention. 1... Drainage, 2... Aeration tank, 3... Air supply device, 4
... Diffuser oval, 5... Rotating drum, 51... Activated carbon, 6... Hot air diffuser mechanism, 7... Heater, 8...
Treated water, 9...exhaust gas 61s.

Claims (1)

[Claims] A wastewater treatment device for purifying wastewater containing organic halogen compounds, comprising an adsorption treatment means for adsorbing the organic halogen compound with activated carbon while aerating the wastewater, and an adsorption treatment means for adsorbing the organic halogen compound on the activated carbon by the adsorption treatment means. A wastewater treatment device comprising: a means for attaching and detaching the water;