JP2003290773A - Ionization cleaning device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prolong the service life of an electrode by removing contaminants from waste water while removing scale adhering to the electrode, and to provide an ionization cleaning device in which the removal effect of the contaminants is improved even when voltage applied between the electrodes is decreased. <P>SOLUTION: In the ionization cleaning device which removes the contaminants in the waste water by applying direct current voltage to the electrodes arranged in a septic tank containing the waste water, the electrodes are disposed movably and the scale adhering to the surfaces of the electrodes is removed by moving the electrodes while rotating the electrodes. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ionization / ionization purification apparatus for purifying industrial wastewater and domestic wastewater by ionization ionization.

[0002]

2. Description of the Related Art Industrial wastewater, domestic wastewater, and wastewater mixed with human excrement (hereinafter collectively referred to as "wastewater") cannot be directly discharged to rivers or sewage or reused, so it is once purified. There is a need. The pollutants contained in the wastewater include colloidal fine particles, phosphorus components, COD, SS and the like. These pollutants are generally positively or negatively charged, and particles having the same type of charge repel each other, so that they are difficult to aggregate and difficult to collect.

As a method for treating charged pollutants,
The ionization ionization method is known. In the ionization ionization method, as shown in FIG. 5, a pair of electrodes (92) and (94) are arranged in a septic tank (90), and a DC voltage is applied between both electrodes (92) and (94) to remove wastewater. It neutralizes, eliminates or reduces the electric charge of the pollutant, and causes the pollutant to aggregate with each other. Aggregated pollutants
By bubbling fine air bubbles to the (flock), the fine air bubbles are adsorbed on the flock and the flocs can be floated and separated. As electrodes, electrodes made of aluminum, aluminum alloys, etc. and electrodes made of stainless steel, iron oxide, etc. are used. When a DC voltage is applied between these electrodes, aluminum ions are ionized from the aluminum electrodes. Due to the aggregating action of the aluminum ions, the pollutants in the wastewater agglomerate into flocs.

The ionization ionization method is an effective method for removing components such as phosphorus, normal hexane, COD and decolorization in wastewater.

[0005]

In the above-mentioned ionization ionization method, since the reaction proceeds due to ionization of the electrode components, the electrode becomes thin due to long-term use, or contaminants adhere to the surface of the electrode as a scale, and There is a problem that the voltage flowing through the electrodes decreases, and it is usually necessary to replace the electrodes every 1 to 3 months. Further, in order to increase the efficiency of removing contaminants, it is necessary to pass a current of about 6 to 40 V and about 30 to 100 A between the electrodes.

An object of the present invention is to remove the scale adhering to the electrode and to remove the pollutant from the wastewater, thereby extending the life of the electrode and enhancing the effect of removing the pollutant. It is an object of the present invention to provide an ionization / ionization purification device capable of performing ionization.

[0007]

In order to solve the above-mentioned problems, the ionization / ionization purifying apparatus of the present invention applies a DC voltage to electrodes arranged in a septic tank containing waste water to thereby pollute substances in the waste water. In the ionization / ionization purifying apparatus for removing the above, the electrode is movably provided, and the scale attached to the surface of the electrode can be removed by moving the electrode while rotating the electrode.

[0008]

[Operation and effect] Since the electrode placed in the septic tank is rotatable, the rotation of the electrode changes the polarity of the electrode and removes the scale adhering to the surface. Also,
During the rotational movement, the electrodes are rubbed against each other, so that the scale attached to the surface is removed. Further, when the electrode is exposed from the waste water and the exposed portion is washed, the scale attached to the electrode surface of the exposed portion is removed by washing. During the work of removing contaminants, the scale adhering to the electrode surface is also removed, so it is possible to maintain a high electrode reaction for a long period of time without lowering the conductivity of the electrode surface, and contaminants in wastewater Can be effectively removed.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION <First Embodiment> FIG. 1 is a perspective view showing an embodiment of an ionization / ionization purification device (10) of the present invention. The ionization / ionization purification device (10) has a pair of main electrodes (20) and (22) arranged inside a septic tank (12) into which wastewater is charged, and a plurality of auxiliary electrodes between the main electrodes (20) and (22). (30) It is configured by arranging (30). The auxiliary electrode (30) is housed in the auxiliary electrode moving means (32) as described later.

The septic tank (12) is a casing made of a material such as FRP (fiber reinforced plastic), and has an inflow pipe (14) for letting the wastewater into the septic tank (12) and the wastewater after purification is discharged. A drainage pipe (16) is formed. The inflow pipe (14) is
It is desirable to open near the lower part of the septic tank (12), and it is desirable that the drain pipe (16) open near the upper part of the septic tank (12).

The main electrodes (20) and (22) are electrically connected to a power supply device (18) which supplies a DC voltage, and are arranged so as to be partially or wholly immersed in the waste liquid. The size and shape of the main electrodes (20) and (22) are not particularly limited, but it is desirable that the size and shape are approximately the same as the end surface of the case (34) of the auxiliary electrode moving means (32) described later. . The material of the main electrodes (20) (22) is
It can be made of Fe, Al, or an alloy thereof, or a material containing ceramic or the like for increasing strength.

An auxiliary electrode (3) provided between the main electrodes (20) and (22)
(0) (30) can be made from a material such as an Al-Fe alloy. The auxiliary electrode (30) preferably has a spherical shape, but may have a shape other than the spherical shape, for example, an elliptical shape, a cylindrical shape, a prismatic shape, or a crushed metal mass. It is desirable to form a coating such as a hydroxide coating on the surfaces of the auxiliary electrodes (30) (30). The hydroxide film is mainly composed of Al, Mg and Ca,
In addition, a small amount of Fe, Ni, Cr or the like may be included. The outer diameter of the auxiliary electrode (30) is about 3 to 10 cm, preferably about 5 cm, and the outer diameter may be the same. However, if the electrodes having different outer diameters are mixed and used, the auxiliary electrode (30) The contact efficiency between them is enhanced, and the scale removal effect can be enhanced. Also, the auxiliary electrode (30) to be housed
The number of the auxiliary electrodes (30) varies depending on the size of the case (34) (described later) that accommodates the auxiliary electrode (30), but is an amount that allows the auxiliary electrode (30) to move freely inside the case (34). It is desirable to accommodate

The auxiliary electrodes (30) (30) are the main electrodes (20) (22).
It is housed in the auxiliary electrode case (34) provided between them. The case (34) is a cylindrical body whose end faces are arranged close to the main electrodes (20) (22), and the rotating shaft (36) is attached to the shaft center, and the rotating shaft (36) is Rotational drive means (3
It is linked to 8). Both ends of case (34) and main electrode (20)
The closer to (22), the closer it is, and preferably about several mm to several cm. The case (34) is made of Al-
It can be made from a Fe alloy. A plurality of holes (35) (35) for allowing wastewater to flow into the case (34) are formed in the peripheral wall or the side wall of the case (34).

The case (34) is used to efficiently remove the scale attached to the auxiliary electrodes (30) (30), float flocculated flocs, and circulate the waste water inside the septic tank (12).
It is desirable to arrange bubbling means (13) inside. For removing the scale of the auxiliary electrodes (30) (30), it is effective to irradiate the auxiliary electrodes (30) (30) with ultrasonic waves.
Further, in order to promote the movement of the auxiliary electrode (30) in the case (34), one or more protrusions or ridges (not shown) may be provided in the case (34).

A waste water purification process by the ionization / ionization purification device (10) having the above structure will be described. First, waste water is introduced into the septic tank (12) from the inflow pipe (14). With the main electrodes (20) (22) and case (34) almost immersed in wastewater, the main electrodes (20) (22)
A DC voltage is applied from the power supply device (18) in the meantime, and the rotation drive means (38) is driven to rotate the case (34).
A voltage of 4 to 30 V is applied between the main electrodes (20) and (22).
It is of course possible to operate at a voltage higher than this. The current value flowing between the main electrodes (20) (20) is
Due to the existence of 0) and (30), it can be suppressed to a lower level than before.

By applying a DC voltage between the main electrodes (20) and (22), metal ions are charged from the negatively charged main electrode (20).
(For example, aluminum ions) elute and neutralize, reduce or eliminate the potential of pollutants (colloidal particles, which are generally negatively charged) in wastewater. By this electrode reaction, contaminants aggregate with each other to form flocs. The auxiliary electrodes (30) and (30) arranged between the main electrodes (20) and (22) generate residual electric current when a DC voltage is applied between the main electrodes (20) and (22), and the auxiliary electrodes (30) ( As for 30), the side close to the negative side main electrode (20) is positively charged, and the side close to the plus side main electrode (22) is negatively charged. As a result, also in each auxiliary electrode (30), an electrode reaction occurs, the potential of the pollutant is neutralized, reduced or disappears,
Pollutants aggregate with each other. As mentioned above, the main electrode (20)
(22) In addition to the electrode reaction by the auxiliary electrodes (30) and (30), the pollutants in the wastewater are aggregated into flocs, and the bubbling means (13) adsorbs the pollutants by adsorbing fine bubbles to the flocs. Can be floated and separated.

As the electrode reaction at the auxiliary electrodes (30) (30) progresses, scale adheres to the surfaces of the auxiliary electrodes (30) (30).
When the scale adheres to the surface of the auxiliary electrodes (30) (30), the electrode reaction is reduced and the purification ability is greatly reduced. However, in the present invention, the auxiliary electrodes (30) (30) are housed in the case (34) and the case (34) is rotated. As a result, the auxiliary electrodes (30) (30) housed inside rotate in the case (34). Since the electric polarity of each auxiliary electrode (30) changes due to the rolling of the auxiliary electrode (30), the attached scale is removed by the change in the polarity. In addition, the auxiliary electrode (3
0) and (30) move while colliding with each other or the inner surface of the case (34). As a result, the scale attached to the surfaces of the auxiliary electrodes (30) (30) is peeled off, adsorbed by the fine bubbles due to bubbling, and floated up and separated together with the contaminants. That is, since it is possible to avoid the adhesion of scale to the auxiliary electrodes (30) (30), it is possible to perform a highly efficient electrode reaction for a long period of time, and also to replace the auxiliary electrodes (30) (30), The interval for cleaning and the like can be lengthened. The rotation of the auxiliary electrode case (34) may be performed continuously or intermittently depending on the scale adhesion of the auxiliary electrodes (30) and (30) and the degree of pollution of waste water. .

The ionization / purification device (10) having the above structure is
For example, it can be used by incorporating it into a purification system (60) as shown in FIG. The purification system (60) has a circulation tank (6
2), the ionization / ionization purification device (10) of the present invention connected to the circulation tank (62), a polymer reaction tank (68) arranged downstream of the circulation tank (62), and the polymer It may be configured to include a floating tank (69) arranged on the downstream side of the reaction tank (68).

The circulation tank (62) is a casing made of stainless steel or the like, and a wastewater introduction pipe (63) into which wastewater is introduced.
And a pipe (64) connected to the inflow pipe (14) of the purification device (10) and guiding a part of the waste water to the ionization and ionization purification device (10), and the purified waste water to the polymer reaction tank (68). It is equipped with a drainage pipe (65). The circulation tank (62) may be provided with a pair of electrodes or a plurality of pairs of electrodes connected to a DC power source in order to enhance the purification efficiency. Further, bubbling means (67) for floating and separating pollutants may be arranged at the bottom of the circulation tank (62). Furthermore, chemicals such as polyaluminum chloride, sulfuric acid band, ferrous chloride and ferric chloride are put in the circulation tank (62) to neutralize and collect pollutants in the wastewater to collect and purify them. You may increase efficiency.

A part of the waste water introduced into the circulation tank (62) flows into the ionization / ionization purification device (10) through the pipe (64). A pump means (66) is inserted in the path of the pipe (64), and the waste water is fed from the circulation tank (62) to the purification device (10) by driving the pump means (66).

The wastewater that has flowed into the purification device (10) is purified by the electrode reaction of the main electrodes (20) (22) and the auxiliary electrodes (30) (30) as described above, and is discharged from the drain pipe (16) to the circulation tank. Returned to (62).

The wastewater purified by the circulation tank (62) and the purification device (10) is a polymer reaction tank provided on the downstream side of the circulation tank (62).
Sent to (68). In the polymer reaction tank (68), the polymer flocculant
(For example, an aniline type) is charged and a chemical treatment is performed. If necessary, the polymer reaction tank (68) may be provided with a means for stirring the waste water inside.

The wastewater from which pollutants have been removed by the chemical treatment in the polymer reaction tank (68) is sent to the flotation tank (69) provided on the downstream side of the reaction tank (68). In the flotation tank (69), bubbling is performed on the flocs, and the flocs are levitated and collected. The collected floating material can be discarded or used as plant fertilizer or the like.

By purifying the wastewater with the purification system (60), most of the pollutants such as phosphorus, nitrogen, organic and inorganic components contained in the wastewater can be removed.

As a different embodiment, as shown in FIG. 3, the auxiliary electrode case (34) is formed into a cylindrical shape, and the auxiliary electrodes (30) and (30) are provided on the lower portion of the inner surface of the cylindrical case (34). An example is one including a stirring member (40) that is moved by stirring.
An example of the stirring member (40) is a blade. A non-conductive member (42) is interposed at the bottom of the case (34) to connect the main electrode (2
0) is provided, and the main electrode (22) is provided on the upper part of the case (34). The non-conductive member (42) is arranged in the auxiliary electrode (30).
This is to prevent the main electrode (20) from directly contacting with.
The stirring member (40) is connected to the rotating shaft (44) at the center position and can be rotated by the motor (46). A plurality of holes through which waste water can flow are provided on the peripheral surface and / or the bottom surface of the case (34), and when the stirring member (40) is rotated with the waste water introduced into the case (34), the main Auxiliary electrodes (30) (30) arranged between the electrodes (20) (22) are cased by the stirring member (40).
Move while rotating in (34). As a result, the ionization ion decomposition of the waste water is performed, and the auxiliary electrode (30) is rubbed with each other due to the electrical polarity change caused by the rolling of the auxiliary electrodes (30) and (30). ) It is possible to remove the scale attached to the surface of (30). The main electrodes (20) (22) are formed in a cylindrical shape or a semi-cylindrical shape, and
It may be arranged on the inner surface or the outer peripheral surface of (34).

In a further different embodiment, a tubular member having spiral blades is provided on the side of the auxiliary electrode case,
The auxiliary electrode (30) may be moved. The auxiliary electrodes (30) are fed into the tubular member one by one from the lower surface of the auxiliary electrode case, and are raised while rolling on the spiral blade, whereby the scale attached to the auxiliary electrode is peeled and removed. It When the auxiliary electrode (30) moves to the upper part of the tubular member, the auxiliary electrode (30) falls from the upper end of the tubular member into the auxiliary electrode case by the action of gravity. Auxiliary electrode (30)
The electric polarity changes due to movement within the case, the auxiliary electrodes (30) and (30) are rubbed against each other, and further contact the blades and the tubular member while passing through the inside of the tubular member. The scale is removed from the surface. Therefore, a high electrode reaction can be maintained for a long period of time without replacing the auxiliary electrode (30).

<Embodiment 2> In the above embodiment, the main electrode (2
Auxiliary electrodes (30) and (30) are placed between (0) and (22), and auxiliary electrodes (30) (3)
(0) can be rotationally moved to remove the scale attached to the auxiliary electrodes (30) and (30) .However, in the present embodiment, the main electrodes (20) and (22) themselves can be moved without using the auxiliary electrodes. Then, a part of the main electrodes (20) (22) is sequentially exposed from the wastewater to the outside, and the scale adhering to the exposed portions is removed by the scale removing means (76). The ionization / ionization purification device (10) in the present embodiment includes a pair of main electrodes (20) and (22) inside a septic tank (12). Similar to the first embodiment, the septic tank (12) includes a wastewater inflow pipe and a drain pipe (not shown), and the septic tank (12) has bubbling means (13) at the bottom thereof.
The main electrodes (20) (22) are connected to a power supply device (18) for applying a DC voltage, and the electrodes are moved so that a part of the main electrodes (20) (22) can be sequentially moved while being exposed from the wastewater. Connected to the means (70). The main electrodes (20) and (22) are formed in a disk shape, for example, as shown in FIG. 4, and the main electrodes (20) and (22) are partially exposed from the wastewater. ), The rotary shafts (72) and (72) are connected to each other, and the rotary shafts (72) and (72) are connected to the rotary drive means (74) such as a motor.
It can be configured to be connected to. When you drive the motor,
The main electrodes (20) and (22) rotate in a state where a part of the main electrodes is sequentially exposed from the wastewater.

Scale removing means (76) for removing scale adhering to the main electrodes (20) and (22) is provided close to the exposed portions of the main electrodes (20) and (22) from the wastewater. An example of the scale removing means (76) is a water radiating means that radiates water toward the exposed portions of the main electrodes (20) and (22). By irradiating water to the exposed portions of the main electrodes (20) and (22), the scale attached to the surface is peeled off and removed. In addition to exposing the exposed parts, in order to prevent the scale from adhering to the waste water and enhance the peeling effect, the main electrodes (20) (22) are irradiated with ultrasonic waves,
Bubbling may be applied toward (20) and (22).

In the ionization / ionization purification device (10) having the above structure, waste water is introduced from the inflow pipe (14) into the septic tank (12), and fine bubbles are supplied into the waste water from the bubbling means (13). Also, with the main electrodes (20) (22) immersed in wastewater,
A DC voltage is applied to the main electrodes (20) and (22) from (18) to drive the rotation driving means (74), and water is also discharged from the scale removing means (76) toward the main electrodes (20) and (22). Radiates. When a DC voltage is applied, an electrode reaction occurs between the main electrodes (20) and (22), and the pollutants in the waste water aggregate to form flocs, which causes bubbling.
The fine bubbles supplied by (13) are adsorbed on the flocs, the flocs are floated and separated, and discharged from the drain pipe (16). By applying a DC voltage to the main electrodes (20) (22),
The scale adheres to the surface of the main electrodes (20) (22),
When a part of the (20) (22) is sequentially exposed from the wastewater, the scale removing means (76) emits water toward the main electrodes (20) (22) to discharge the main electrodes (20) (22). ), The scale adhered to is removed. Therefore, the electrode reaction can proceed without depositing scale on the main electrodes (20) (22),
There is no need to remove, clean or replace the main electrodes (20) (22). The rotation of the main electrodes (20) (22) and the operation of the scale removing means (76) may be continuously performed depending on the scale attachment degree of the main electrodes (20) (22) and the degree of pollution of waste water. You may do it intermittently.

In the second embodiment, the auxiliary electrodes (30) and (30) of the first embodiment are not used, but the auxiliary electrodes are movably arranged between the main electrodes (20) and (22) to Not only 20) and 22), the pollutant can be efficiently removed by promoting the electrode reaction not only by the auxiliary electrode.

[0031]

EXAMPLES Example 1 An attempt was made to purify wastewater (hereinafter referred to as raw water A to D) using the ionization / ionization purification apparatus (10) of Embodiment 1 shown in FIG. As the auxiliary electrodes (30) and (30), 80 spherical electrodes having a diameter of 3 to 5 cm were put. [Other conditions] Amount of raw water: 10 liters Processing time: 60 minutes Voltage value: 30V Current value: 2A

When the appearance and odor of raw water A to D were examined, the following results were obtained. Raw water A: It looks clear and beautiful. There is no odor. Raw water B: Brown and cloudy. The rotten smell of shrimp is strong. Raw water C: Light brown and cloudy. There is a slight rotten smell of shrimp. Raw water D: Light yellow and cloudy. There is a slight odor. Further, when the phosphorus concentrations of the raw waters A to D were examined, the results shown in Table 1 were obtained.

[0033]

[Table 1]

Table 1 shows the results of purification of raw water A to D using the ionization / ionization purification apparatus (10) of the present invention.

Referring to Table 1, it is understood that the purified waters A to D all have a reduced phosphorus concentration after purification, and that the removal rates are very high. This is because phosphorus was effectively removed not only by the main electrodes (20) (22) but also by the electrode reaction caused by the auxiliary electrodes (30) (30) arranged between the main electrodes (20) (22). Is shown.

When the above treatment was applied to other raw water having a high phosphorus concentration, the phosphorus concentration could be reduced from 23 ppm of the raw water to 0.14 ppm of the purified water.

Example 2 As shown in FIG. 1, the main electrode (2
As shown in FIG. 5, an ionization / ionization purification device (10) of the present invention in which auxiliary electrodes (30) and (30) are movably arranged between 0 and (22).
Purification device (1) that does not have an auxiliary electrode between the main electrodes (92) and (94)
0) was produced and wastewater with high COD (C containing a large amount of sugar
Wastewater with high OD) was used to apply a DC voltage of 30 V to carry out purification operation. Immediately after the start of the cleaning operation, the current values between the main electrodes were both about 2A. After that, when the current value between the main electrodes was measured with time, the purification device (10) of the present invention showed that
The current flowing between the main electrodes (20) and (22) is about 2A even after a lapse of months.
I was able to maintain. This is because it is possible to prevent the scale from adhering to the surface due to the collision between the auxiliary electrodes (30, 30) and the change in polarity due to the rolling of the auxiliary electrodes (30, 30). On the other hand, in the purification device of the comparative example, the current value dropped to about 0.1 to 0.3 A in 3 days, and almost no current flowed in 1 week, and the main electrodes (92) (94) were taken out from the wastewater. As a result, the scale was adhered around the main electrode in a solidified state.

The above description of the embodiments is for explaining the present invention, and should not be construed as limiting the invention described in the claims or reducing the scope. Further, the configuration of each part of the present invention is not limited to the above embodiment, but various modifications can be made within the technical scope described in the claims.

[Brief description of drawings]

FIG. 1 is a perspective view of an ionization / ionization purification device according to a first embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a purification system including the ionization / ionization purification device of the present invention.

FIG. 3 is an explanatory view showing another embodiment of the ionization / ionization purification device.

FIG. 4 is a perspective view of an ionization / ionization purification device according to a second embodiment of the present invention.

FIG. 5 is a cross-sectional view of a conventional purification device.

[Explanation of symbols]

(10) Ionization and purification device (12) Septic tank (20) Main electrode (22) Main electrode (30) Auxiliary electrode (34) Case

Claims (5)

[Claims] 1. In an ionization / ionization purification device for removing pollutants in wastewater by applying a DC voltage to the electrode arranged in a septic tank containing wastewater, the electrode is movably arranged and the electrode is rotated. An ionization / ionization purification device characterized in that the scale attached to the surface of the electrode can be removed by moving the electrode while moving it. 2. An ionization / ionization purification apparatus for removing contaminants in wastewater by applying a DC voltage between a pair of electrodes arranged in a septic tank containing wastewater, and rotating a plurality of auxiliary electrodes between the electrodes. An ionization and ionization purification device characterized in that it is movably arranged and scales attached to the surface of the auxiliary electrode are removed by moving the auxiliary electrode while rotating it. 3. An auxiliary electrode case in which waste water can flow is disposed rotatably between the electrodes, and the auxiliary electrode is housed in the auxiliary electrode case and is rotated by rotating the auxiliary electrode case. The ionization / purification device according to claim 2, wherein the electrode moves while rotating in the auxiliary electrode case, and the scale attached to the surface of the auxiliary electrode is electrically removed. 4. An auxiliary electrode case in which wastewater can flow is provided between the electrodes, the auxiliary electrode is housed in the auxiliary electrode case, and the auxiliary electrode is moved to the lower surface of the auxiliary electrode case. The ionization ionization according to claim 2, further comprising a stirring member, and by rotating the stirring member, the auxiliary electrode housed inside moves while rotating, and the scale attached to the surface of the auxiliary electrode is electrically removed. Purification device. 5. An ionization and ionization purification device for removing pollutants in wastewater by applying a DC voltage between a pair of electrodes arranged in a septic tank containing wastewater, and a part of the electrodes is exposed sequentially from the wastewater. An ionization / ionization purification apparatus comprising: an electrode moving unit that movably supports the electrode, and a scale removing unit that removes scale attached to an exposed portion of the electrode.