JPH0947616A - Active carbon filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simply and easily regenerate active carbon in an active carbon filter which can be used for treating clean water. SOLUTION: An active carbon layer 9 is formed on an electrode 8A and when an electric voltage is applied on the electrode 8A, the temp. of the active carbon is elevated and the pollutants adsorbed on the active carbon are changed to ashes. Then, the ashes are washed by feeding cleaning water through an inlet 4a and an outlet 5a for the water to be treated to regenerate the active carbon.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an activated carbon filter which can be used for treating purified water and the like, and relates to regeneration of activated carbon.

[0002]

2. Description of the Related Art Activated carbon filters are used to remove off-flavors, phenols and other organic substances that cannot be removed by water purification. FIG. 4 (A) is a conceptual diagram of a conventional filter 100, which is a cylindrical outer cylinder 103 and an upper lid 104 forming an inlet 104a of treated water and an outlet of purified purified water. A closed container is formed with the lower lid 105 forming 105a. In the outer cylinder 103, wire meshes 108, which are spaced by spacers 107 at regular intervals, are installed up and down, and granular activated carbon 109a as a filter is filled between them to activate the activated carbon layer 10
9 is formed. Then, the treated water sent through the pump 110 enters from the inlet 104a, passes through the activated carbon layer 109 of the filter material to remove impurities, becomes purified water, and is discharged from the outlet 105a.

[0003]

However, when the amount of treated water increases, the amount of pollutants adsorbed on the activated carbon 109a increases and clogging occurs, and the treated amount decreases. Therefore, it is necessary to replace the activated carbon 109a. Will be needed. Therefore, as shown in FIG. 4B, the treated water from the pump 110 is filtered by a plurality of filters 100 (100a, 100b, 1).
00c), one or two of the filters 100 are arranged as a replacement filter. Next, the treated water from the pump 110 is passed through the filters 100b, 10b.
The operation of exchanging the filter 100a during filtration through 0c will be specifically described. The valves 110a and 110b are closed, the valve 121 is opened, the valve 122 is closed, and the valves 111a, 111b and 112a, 112b
Is opened and the valve 123 is closed. Treated water is 100
Although the water is treated with b and 100c, the treated water to the filter 100a is shut off and can be replaced. In this way, it is necessary to install a plurality of filter devices 100 and stop the filter devices to replace the activated carbon, which requires time and effort. In addition, since the regeneration treatment of the activated carbon is usually performed at 100 ° C. and then in the firing furnace (400 to 700 ° C.), a preliminary activated carbon is prepared in the treatment system of FIG. 4 (B). Need to be kept. Therefore, the present invention requires a filter device that enables a simpler regeneration of activated carbon, which is different from the conventional one.

[0004]

When a voltage is applied to an electrode provided in an activated carbon filter, Joule heat is generated due to the activated carbon layer immersed in water becoming a resistance. The activated carbon heated by this heat gradually rises in temperature, and initially becomes steam to dry the activated carbon, but thereafter, as the activated carbon becomes hot, the pollutants adsorbed on the activated carbon turn into ash. After that, when washing water is sent through the treated water inlet and outlet, the ash is washed and the activated carbon is regenerated.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS

(Aspect of the First Invention) FIG. 1 (A) shows a filtered state of treated water through a filter 1, and FIG. 1 (B) shows a backwashed state of activated carbon 9. An upper lid 4 forming a treatment water inlet 4a is detachably attached to the upper opening of the cylindrical, heat- and corrosion-resistant ceramic outer cylinder 3, and an outlet 5a of purified water is attached to the lower opening of the outer cylinder 3. The lower lid 5 for forming the filter is detachable and forms a closed container of the filter 1. Three-way valves 10 and 11 are attached to the inlet 4a and the outlet 5a, respectively. Further, in the outer cylinder 3, there are vertically arranged heat-corrosion-resistant titanium electrodes 8A formed in a wire mesh shape with insulating spacers 7 at regular intervals.
In the meantime, an activated carbon layer 9 filled with activated carbon 9a as a filter is formed. Further, the electrode 8A is connected via a lead wire 13 to a voltage / current regulator 12 capable of changing the voltage / current value so as to correspond to the resistance change due to the water immersion state of the activated carbon layer 9,
The voltage / current regulator 12 is supplied from an AC power supply 14.

Next, the regeneration of activated carbon will be described with reference to FIGS. 1 (A) and 1 (B). The state shown in FIG. 1 (A) shows a state in which treated water is treated by the activated carbon layer 9,
The valve 10 and the valve 11 are set to the positions shown in FIG. The treated water sent from the supply pump 20a is the valve 1
0 through 0 into the inlet 4a, flowing into the activated carbon layer 9 from the wire mesh electrode 8A, off-flavors, phenols and other organic substances are adsorbed on the activated carbon 9a, purified water purified,
It is discharged from the outlet 5a and the valve 11.

When a large amount of impurities are adsorbed on the activated carbon 9a and the removal ability is lowered, the valve 10,
Both 11 are closed and the treatment of the treated water is stopped. When the voltage / current regulator 12 is activated, a current flows between the electrodes 8A, and the activated carbon layer 9 immersed in water acts as a resistance to generate Joule heat. The activated carbon layer 9 heated by this heat gradually rises in temperature, and initially becomes steam to dry the activated carbon 9a, but thereafter, as the activated carbon 9a becomes higher in temperature, the activated carbon 9a is heated.
The pollutants adsorbed on a turn into ash. During this time, the valve 10 or another valve (not shown) is opened to release water vapor or degassed gas. Then, when washing water is sent from the backwash pump 20b through the outlet 5a, the ash is discharged together with the washing water from the inlet 4a, and the activated carbon 9a is regenerated.
The treated water can be filtered in the state shown in (A). As described above, the treated water can be filtered through the activated carbon 9a, and after the electric current is passed through the electrode 8A for a predetermined time, the activated carbon 9a can be regenerated by performing the washing work, and the
Processing becomes possible.

(Second Aspect of the Invention) The present embodiment has a configuration in which the position of the electrode 8A is different from that of FIG. 1A.
The same parts as those in FIG. 1A are designated by the same reference numerals and the description thereof is omitted. Wire meshes 8 are installed at upper and lower positions in the outer cylinder 3 at regular intervals by spacers 7, and activated carbon 9 is used as a filter between them.
Is filled. Further, the heat and corrosion resistant electrodes 8B are installed at the left and right ends in the outer cylinder 3 and are connected to the lead wires 13 from the voltage / current regulator 12. The filter can be configured in this manner, and the treatment of the treated water and the regeneration of the activated carbon 9a are the same as those in the first embodiment, and therefore the description thereof is omitted.

(Third Aspect of the Invention) In the present embodiment, two filter devices 1 (1L, 1R) shown in FIG. 1 are provided side by side so that they can be alternately used. The same reference numerals are given to parts having the same operation as, and the description thereof will be omitted. In the middle of the lead wire to the electrode 8A, the interlocking changeover switch 2 (2a,
2b) is provided and conducts to either one of the electrodes 8A. The state shown in FIG. 3 is a state in which the treated water is treated from the pump 20a through the valve 10, the inlet 4a, the activated carbon layer 9, the outlet 5a, and the valve 1 by the filter 1L. On the other hand, the filter 1R converts impurities adsorbed on the activated carbon 9a into ash by the voltage / current regulator 12, and after this state is reached, washing water is sent from the pump 20b through the outlet 5a to remove the ash. The activated carbon is regenerated by discharging it through the inlet 4a together with the washing water. By installing the two filters 1L and 1R as in the present embodiment, the other filters 1R that are processing the treated water can be treated against the other filters 1R.
The activated carbon can be regenerated and the treated water can be continuously operated.

[0010]

Industrial Applicability According to the present invention, it is possible to regenerate the activated carbon by providing the electrode, and unlike the conventional method, the replacement work of the activated carbon can be eliminated.

[Brief description of drawings]

FIG. 1 is a conceptual diagram of a filter according to a first embodiment.

FIG. 2 is a conceptual diagram of a filter according to a second embodiment.

FIG. 3 is a conceptual diagram of a filter according to a third embodiment.

FIG. 4 is a conceptual diagram of a conventional filter.

[Explanation of symbols]

 1 Filter 1L, 1R Filter 8A, 8B Electrode 9 Activated carbon layer 9a Activated carbon 10, 11 Three-way valve 12 Voltage / current regulator 20a Supply pump 20b Backwash pump

Claims (1)

[Claims] 1. An activated carbon filter for introducing treated water from an inlet to an activated carbon layer and discharging purified water from the activated carbon layer from an outlet, after providing an electrode on the activated carbon layer and applying a voltage to the electrode, An activated carbon filter characterized in that the activated carbon layer is washed through the inlet and the outlet.