JPH10109084A - Water purification device using active coal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water purification device by which only a chlorine component but also organic matters, malodorous substance and organic chorine compounds such as trihalomethanes contained in drinking water are efficiently removed and safe drinking water is fed and also in which active coal used for a long period is contained. SOLUTION: In the water purification device having an active carbon filtering tower 6 for treating drinking water with an active carbon, a means 4 for feeding hot water to an active carbon filled layer in the tower and a means 11 for evacuating the inside of the tower are provided on the active carbon filtering tower 6, and the means 4 for feeding the prescribed hot water can use a direct heating means, an indirect heating means by a heat exchanger, etc., and a device for introducing hot water from the outside (hot water piping, etc.), etc. Also as the evacuating means, a vacuum generation device such as a vacuum pump, an aspirator can be used.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water purification device using activated carbon, and more particularly to removing organic substances such as odorous substances and organic chlorine compounds such as trihalomethane, so that they can be safely drunk.
The present invention relates to a water purification device using activated carbon that can be used for a long time.

[0002]

2. Description of the Related Art In recent years, the quality of drinking water has been degraded due to environmental pollution and the like. Odorous substances and organic chlorine compounds such as trihalomethane have been included in the drinking water. I can no longer say. In order to cope with such deterioration of drinking water quality, each household has provided a water purifier at a tap water faucet, and a factory using drinking water has provided a water purification device. Most of these water purifiers and water purifiers use activated carbon. This is because, by using activated carbon, chlorine (calcium) and organic substances that cause the smell of drinking water can be inexpensively and efficiently adsorbed and removed. However,
In the method of filtering drinking water using activated carbon, there has been a problem that various bacteria grow in the activated carbon and the state becomes unfavorable for hygiene.

[0003] In addition, trihalomethane, which is a carcinogen in drinking water, which has recently become a problem, can be adsorbed and removed by activated carbon, but the amount of trihalomethane that can be adsorbed by activated carbon is far greater than that of chlorine that can adsorb the same amount of activated carbon. If the amount exceeds the limit of the amount of trihalomethane that can be adsorbed, the adsorbed trihalomethane leaks into the filtered water, resulting in a higher concentration than before filtration. Therefore, in the conventional apparatus, for safety reasons, before exceeding the above-mentioned limit amount, while leaving the ability to remove chlorine, there was a disadvantage that the activated carbon had to be replaced with new activated carbon, and the activated carbon could not be used effectively. .

[0004]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned problems of the prior art and provides not only chlorine (calcium) but also organic substances and odorous substances contained in drinking water, and organic chlorine compounds such as trihalomethane. It is an object of the present invention to provide a water purifier having activated carbon that can efficiently remove water and supply safe drinking water and can be used for a long time.

[0005]

In order to solve the above-mentioned problems, the present invention provides a water purification apparatus having an activated carbon filtration tower for treating drinking water with activated carbon. A water purifier is provided, which comprises a means for supplying water and a means for reducing the pressure in the tower. In the water purifier, as a means for supplying hot water, a device for direct heating, a device for indirect heating by a heat exchanger or the like, and a device for introducing hot water from the outside (hot water piping or the like) can be used. As means for reducing the pressure,
A vacuum generator such as a vacuum pump or an aspirator can be used.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic configuration diagram showing an example of the water purification device of the present invention, and FIG. 2 is a graph showing a result of treating drinking water according to FIG. 1 and showing a water passage ratio and a change in trihalomethane concentration by vacuum regeneration. First, the device shown in FIG. 1 will be described. In the figure, reference numeral 2 denotes drinking water, which is supplied to an activated carbon filtration tower 6.
And a pump 4 for supplying hot water to the activated carbon filtration tower 6. As the hot water supply device 4,
For example, an electric heater, a solar water heater, or a gas water heater may be used to perform direct heating or heat exchange to perform indirect heating. In addition, an electric heater may be installed in the activated carbon filtration tower 6 to directly heat and circulate the water in the tower to heat the whole, or to heat raw water in advance and use it. Reference numeral 6 denotes an activated carbon filtration tower provided with an activated carbon packed bed for treating the fed drinking water with activated carbon. Reference numeral 11 denotes a vacuum generator for reducing the pressure in the activated carbon filtration tower 6. As the vacuum generator, for example, a vacuum generator such as a vacuum pump or an aspirator can be used.

When purifying water with the above-mentioned water purifier, first, valves 1, 5 and 8 are opened, and valves 3, 7, 9, 10, 12 and
13 is closed, and the pump 2 is operated. Drinking water is sent to the activated carbon filtration tower 6 through the valve 1, the pump 2, the hot water supply device 4, and the valve 5, and after filtration, water purification treatment is performed through the valve 8. When backwashing the activated carbon filtration tower, the valves 1, 12, and 13 are opened, the valves 3, 5, 7, 9, and 10 are closed, and the pump 2 is operated. The drinking water flows backward in the activated carbon filtration tower 2, cleans the activated carbon, and is discharged from the valve 12. When performing the hot water treatment of the activated carbon filtration tower, the valves 3 and 5 are opened, all the remaining valves are closed, the pump 2 is operated, and the hot water supply device is operated. Thereby, the hot water circulates in the loop of the activated carbon filtration tower 6, the pump 2, and the hot water supply device 4. That is, the water in the activated carbon filtration tower 6 is circulated by the pump 2 and the inside of the tower is heated while being heated by the hot water supply device 4 on the way. The temperature is 1-2
The hot water supply device 4 is controlled so as to be maintained for about an hour. By the circulation of the hot water, various germs propagated in the activated carbon filtration tower 6 are heat sterilized.

The vacuum treatment of the activated carbon filtration tower is performed after the above-mentioned hot water treatment, that is, after circulating hot water in the activated carbon filtration tower 6 for a certain time. When performing vacuum processing, the valves 7 and 10 are opened, all the remaining valves are closed, and the vacuum generator is operated. Thereby, the hot water in the activated carbon filtration tower 6 is supplied to the valves 7, 1
0, discharged through a vacuum generator. That is, when the pressure in the activated carbon filtration tower 6 is reduced by the vacuum generator 11 to a predetermined pressure (about 50 to 76 cmHg), the vacuum generator is controlled so as to maintain the pressure for about 1 to 2 hours. FIG. 2 shows the results obtained by vacuum regeneration. In FIG. 2, point (a) is a point before vacuum regeneration, and point (b) is a point after vacuum regeneration. From the flow rate and trihalomethane concentration change in FIG.
The activated carbon was regenerated 20 to 100% after the vacuum treatment, and it was recognized that volatile organic substances such as trihalomethane adsorbed on the activated carbon were separated from the activated carbon.

As described above, the water purification apparatus of the present invention purifies water by passing water through an activated carbon packed bed in an activated carbon filtration tower, and periodically discharges drinking water in the filtration tower to generate hot water. Activate the supply device, guide the hot water generated from the hot water supply device to activated carbon, and heat it with this hot water,
Germs that propagate in the filtration tower can be sterilized.
Further, after the hot water treatment, the vacuum generating device is operated to reduce the pressure in the activated carbon filtration tower, so that the volatile organic substances adsorbed on the activated carbon are separated from the activated carbon, and the organic substance adsorption ability of the activated carbon can be recovered. . In the above example, the hot water was flowed from the top to the bottom of the activated carbon filtration tower 6, but may be flowed in the opposite direction.

[0010]

According to the water purifier of the present invention, the germs in the activated carbon can be sterilized by the heat of the hot water, and the activated carbon can always be used in good hygiene. Further, by reducing the pressure in the activated carbon filtration tower, volatile organic substances such as trihalomethane adsorbed on the activated carbon in the activated carbon filtration tower can be separated from the activated carbon and discharged, so that the replacement time of the activated carbon can be greatly extended.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing an example of a water purification device of the present invention.

FIG. 2 is a graph showing changes in the water flow rate and the trihalomethane concentration by vacuum regeneration.

[Explanation of symbols]

1, 3, 5, 7, 8, 9, 10, 12, 13: Valve 2:
Pump 4: Hot water supply device 6: Activated carbon filtration tower 11:
Vacuum generator

Claims (1)

[Claims] 1. A water purification apparatus having an activated carbon filtration tower for treating drinking water with activated carbon, wherein said activated carbon filtration tower is provided with means for supplying hot water to an activated carbon packed bed in the tower and means for depressurizing the inside of the tower. A water purification device characterized by the following.