JPH0524815A - Method for thermal regeneration of active carbon - Google Patents

Abstract

PURPOSE:To simply and efficiently regenerate heat at a low temperature without consuming active carbon by treating the active carbon at different temperatures in many stages using heated air or steam. CONSTITUTION:A filter cartridge 6 and an active carbon cartridge 6 surrounded with a heat insulating material 9 are arranged at the back of a body 1. Tap water taken in from an inflow port 2 is then passed through the aforementioned filter cartridge 5 to remove iron rust, water scale, etc. The resultant tap water is subsequently passed through solenoid valves (8a) and (8b) and the active carbon cartridge 6 as indicated by arrows of solid lines to adsorb and remove trihalomethanes, musty smell, etc. The water is then discharged from a discharge port 4. In the aforementioned water purifier, hot air produced in a hot air producer 7 is passed through the solenoid valves (8a) and (8b) and the active carbon cartridge 6 as indicated by arrows of broken lines and subsequently discharged from a vent port 3. In the process, the above-mentioned hot air is kept at 80-120 deg.C temperature to sublime and remove musty smell and then regulate to 130-200 deg.C to eliminate the trihalomethanes, etc. Thereby, the active carbon cartridge 6 can be regenerated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for regenerating activated carbon, and more particularly to regeneration of activated carbon used in water purifiers.

[0002]

2. Description of the Related Art It is common practice to regenerate activated carbon used in water treatment by decomposing or oxidizing an adsorbate to remove it.
And as a method of oxidation and decomposition, the following methods are mainly used. (1) Thermal decomposition by oxidizing gas (oxygen, water vapor, carbon dioxide) at high temperature (2) Oxidative decomposition by microorganisms (3) Oxidation using oxidant (hydrogen dioxide, ozone) (1) method is common It has been adopted for 800-1
Since the treatment is performed at a high temperature of 000 ° C, there is a drawback that the activated carbon is consumed.

In the method (2), when dissolved oxygen decreases, anaerobic microorganisms increase, causing clogging, and when there are sulfate groups in the running water, sulfide may appear in the running water. Further, when dissolved oxygen is sufficiently present in the inflow water, aerobic microorganisms propagate and clogging occurs, which makes it difficult to control the microorganisms.

The method (3) is performed by Johnson et al. (USPHS, Dept. H).
EW, AWTR-11, 1964) has reported that regeneration of activated carbon used for tertiary treatment of sewage with nine kinds of oxidizing agents including hydrogen dioxide (H ₂ O ₂ ). However, since the selectivity of the reaction becomes a serious problem and organic substances that are stable against oxidation remain, the recovery of the adsorption capacity was 71% in the first regeneration, but it was 50% in the second and third regenerations. However, there is a drawback that the adsorption capacity decreases as the number of regeneration times increases.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned drawbacks, and uses heat regeneration which is the easiest to operate, and the regeneration of activated carbon is performed at low temperature so that regeneration can be performed without exhaustion of activated carbon. Intended to be done in.

[0006]

SUMMARY OF THE INVENTION The gist of the present invention is that heated air or steam at 80 to 120 ° C is passed through activated carbon, and then heated air or steam at 130 to 200 ° C is passed through activated carbon. It is a method for regenerating heat of activated carbon.

In the present invention, the activated carbon used in the water purifier is regenerated. The substances contained in the tap water that must be removed include chlorine odor, musty odor, trihalomethane, iron rust, and organic substances, but trihalomethane and musty odor are particularly problematic for drinking water.

By the way, the thermal characteristics of musty odor were examined by differential thermogravimetric analysis. As a result, sublimability was observed at 80 to 120 ° C, thermal decomposition occurred at 120 to 135 ° C, and the residue remained thereafter. Chloroform is a typical substance in trihalomethane, but its boiling point is 61.2 ° C, and it was found that desorption occurs at 130 ° C or higher when it is regenerated by heat.

On the other hand, residual chlorine is ionized by activated carbon. In addition, organic substances such as iron rust and scale are not regenerated at low temperatures, but can be removed with a filter.

Therefore, when the water purifier has a system in which iron rust and organic substances are removed by a filter and then trihalomethane and musty odor are removed by activated carbon, the regeneration of the activated carbon is 80
It is efficient to ventilate the activated carbon with heated air or steam at 120 ° C to 120 ° C and then ventilate the activated carbon with heated air or steam at 130 to 200 ° C.

[0011]

[Operation] In the present invention, a musty odor can be removed by passing heated air or steam at 80 to 120 ° C through activated carbon, and trihalomethane can be removed by passing heated air or steam at 130 to 200 ° C. ..

In the present invention, the activated carbon can be thermally regenerated at a low temperature by regenerating it in multiple stages having different temperatures as described above.

[0013]

Next, an embodiment of the present invention will be described.
Needless to say, the embodiment is merely an example, and various modifications and improvements can be made without departing from the spirit of the present invention.

A description will be given according to the embodiment shown in FIG.
FIG. 1 shows the structure of a water purifier incorporating an activated carbon regenerating apparatus using the method for regenerating heat of activated carbon of the present invention. Body
An inflow port 2 for taking in clean water and an exhaust port 3 for exhausting hot air at the time of regeneration are provided on the back surface of the device 1. Inside the body 1, the vertically arranged filter cartridge 5, the activated carbon cartridge 6 surrounded by the heat insulating material 9 and the hot air generator 7 are housed, and the downstream side of the filter cartridge 5 and the activated carbon cartridge 6 are connected via the solenoid valve 8a. It is connected to the joint located below and the hot air generator 7. Further, the coupling located above the activated carbon cartridge 6 is connected to the exhaust port 3 and the discharge port 4 via the solenoid valve 8b.

Next, the operation method will be described. At the time of supplying purified water for normal use, the solenoid valves 8a and 8b are switched as shown by solid arrows. Clean water is taken in through the water supply port 2, and is first sent to the filter cartridge 5,
Next, it is purified by the activated carbon cartridge 6 and the switch 11 is pressed to supply purified water from the discharge port 4. on the other hand,
When the activated carbon is regenerated, the solenoid valves 8a and 8b are switched as shown by the broken line arrows. 100 ° C which is a temperature at which the musty odor substance is not thermally decomposed in the first stage from the hot air generator 7.
Hot air is sent to the activated carbon cartridge 6 for 3 hours to remove part of musty odorous substances and trihalomethane, and in the second stage, hot air at 170 ° C is sent for 3 hours to remove trihalomethane and its many low-boiling organic substances. To play.

[0016]

INDUSTRIAL APPLICABILITY The present invention has the effect that the activated carbon can be thermally regenerated at a low temperature by regenerating it in multiple stages having different temperatures as described above.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

[Explanation of symbols]

 1 Body 2 Inlet 3 Exhaust Port 4 Discharge Port 5 Filter Cartridge 6 Activated Carbon Cartridge 7 Hot Air Generator 8a Solenoid Valve 8b Solenoid Valve 9 Insulation Material 10 Power Cord 11 Switch

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Norihiko Kawamura 1048, Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Works Co., Ltd. (72) Atsuko Kishimoto, 1048, Kadoma, Kadoma City, Osaka Matsushita Electric Works Co., Ltd.

Claims (1)

Claim: What is claimed is: 1. An activated carbon characterized in that after heating air or steam at 80 to 120 ° C is passed through the activated carbon, heated air or steam at 130 to 200 ° C is passed through the activated carbon. Heat regeneration method.