JP2003039075A - Liquid treatment apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid treatment apparatus capable of eliminating the pressure loss of a liquid to be treated due to electrodes or the adhesion of waste refuse and capable of supplying stable discharge even if operation is continued over a long period of time when a liquid present between electrodes is modified by applying pulse-like power across the electrodes. SOLUTION: In the liquid treatment apparatus supplying the liquid to be treated into a pipeline continuously and intermittently and forming a discharge state between the ring-shaped or cylindrical electrode concentrically arranged with respect to the inner peripheral surface of the pipeline and a linear electrode arranged along the axis of the pipeline to modify the liquid to be treated in the pipeline, the ring-shaped or cylindrical electrode is embedded in the wall of the pipeline so as to leave the inner surface of the electrode.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to (1) biological treatment of organic waste liquid discharged from a sewage treatment process in a sewage treatment plant or a human waste treatment plant, or a wastewater treatment process of a food factory or a chemical factory. Aerobic treatment or anaerobic treatment, (2) sterilization of treated water in the process of producing waste water (including organic substances other than the above) of each plant, clean pure water, tap water, food, drinking water, etc.・ Sterilization treatment, decolorization treatment, deodorization treatment, or (3) Dioxins that appear during sterilization / sterilization treatment, decolorization treatment, deodorization treatment of the above-mentioned various liquids, or when leaching water from leach incinerator. The present invention relates to a liquid treatment device which is applied to decomposition treatment of persistent hormones, PCBs and other persistent substances.

[0002]

2. Description of the Related Art In the various uses shown in (1) to (3) above, various methods such as activated carbon treatment, ozone treatment, and membrane treatment have hitherto been used as methods for reusing water and removing trace contaminants. Is known and is being put to practical use. However, the activated carbon treatment can adsorb and remove organic pollutants, but has no bactericidal effect and requires frequent replacement of the activated carbon. In ozone treatment, decolorization,
Although it is excellent in deodorizing and sterilizing effects, it has a problem of secondary treatment due to residual ozone. Further, in the membrane treatment, although water treatment is excellent from the viewpoint of removing contaminants and the like, there are problems that maintenance is complicated and the cost is high, and waste is generated.

The present inventors have been researching the improvement of the above-mentioned water treatment technology for some time, and have proposed a technology such as Japanese Patent Laid-Open No. 11-253999 as a part thereof. This technique is, for example, as a method for cleaning the liquid by killing harmful bacteria contained in the liquid, or for reducing the volume of fouling components such as bacteria contained in the liquid and carcasses thereof. Therefore, as a method of modifying the fouling component into a state in which aerobic microorganisms can easily be biochemically treated, the liquid is treated by high-voltage pulse discharge treatment and / or electric field pulse application. .

Further, the present inventors have also developed a reforming tank for effectively carrying out the above-mentioned method, and its technical significance was recognized, and therefore the application was filed first (Japanese Patent Application No. 2000-18649).
No. 3). This device will be described with reference to the drawings.

FIG. 1 is a schematic explanatory view showing an example of an arrangement state of electrodes and a discharge state in the reforming tank.
22 is a reforming tank, 25 is a rod-shaped electrode, 26 is a ring-shaped electrode, 27 is a high-voltage pulse power source, 23 is a liquid to be treated, and 24 is a discharge.
Incidentally, in the configuration shown in FIG. 1, the rod-shaped electrode 25 and the ring-shaped electrode 2
By arranging 6 concentrically, the liquid to be treated 23 in the reforming tank 22 can be three-dimensionally discharged.

In the above structure, when a pulse voltage having a sharp rising edge is applied from the high voltage pulse power source 27 between the rod electrode 25 and the ring electrode 26, the tip end of the rod electrode 25 is directed toward the ring electrode 26. Since an omnidirectional discharge is generated as a result, a planar discharge 24 is formed. The planar discharge 24 can cause the discharge 24 to act on the liquid 23 to be treated in a wider range than the linear discharge. In the water treatment utilizing this discharge, it is general to treat by both streamer discharge and arc discharge before transition to arc discharge.

The development of such a device has made it possible to effectively modify the liquid, but it has caused some new problems to be improved. That is, as shown in FIG. 1, when the liquid treatment is continued with the ring-shaped electrode 26 arranged inside the reforming tank 22, pressure loss of the liquid to be treated by the electrode occurs or hair mixed in the liquid to be treated 23 is generated. There is a possibility that dust such as will be entangled with the ring-shaped electrode 26. As a result, there is a concern that the discharge state becomes unstable and the reforming efficiency of the liquid to be treated decreases.

[0008]

SUMMARY OF THE INVENTION An object of the present invention is to supply a pulsed electric power between electrodes to reform a liquid existing between the electrodes, even if the operation is continued for a long period of time.
It is an object of the present invention to provide a liquid processing apparatus capable of supplying stable discharge without pressure loss (pressure loss) of a liquid to be processed caused by the presence of electrodes and adhesion of dust.

[0009]

The liquid processing apparatus of the present invention which has been able to achieve the above object is to supply a liquid to be treated into a pipe line continuously or intermittently to form an inner peripheral surface of the pipe line. A discharge state is formed between a ring-shaped or cylindrical electrode arranged concentrically and a linear electrode arranged along the axis of the conduit to reform the liquid to be treated in the conduit. In the liquid processing apparatus, the gist is that the ring-shaped or cylindrical electrode is embedded in the conduit wall while leaving the inner surface of the electrode.

It is also preferable that the ring-shaped or cylindrical electrode is constructed so that the plane portion of the ring-shaped or cylindrical electrode viewed from the axial direction is not substantially exposed to the inside from the inner wall of the conduit.

Further, in the liquid treatment apparatus of the present invention, there is no step at the connecting portion between the pipe and the treated liquid introducing pipe and / or the treated liquid outlet pipe connected to the pipe. With such a configuration, it is possible to further enhance the effect.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION The present inventors have studied from various angles in order to solve the above problems. As a result, they have found that the above problems can be solved satisfactorily by changing the arrangement of the ring-shaped or cylindrical electrodes, and completed the present invention. Hereinafter, the configuration and operation and effect of the present invention will be described in more detail with reference to the drawings. However, the configuration shown below is not of a nature limiting the present invention, and any design change may be made based on the spirit of the preceding and following description. Also included in the technical scope of the present invention.

FIG. 2 is a schematic explanatory view schematically showing an example of the constitution of the device according to the present invention, in which the arrangement of the ring-shaped electrode 26 in FIG. 1 is changed. Corresponding parts are designated by the same reference numerals. The pipeline 30 shown in FIG. 2 corresponds to the reforming tank 22 shown in FIG.

In the device shown in FIG. 2 (a), the ring-shaped electrode is used.
26a is configured to be embedded in the wall surface of the conduit 30 while leaving the inner surface 26b of the electrode. According to this structure, the electrode surface of the ring-shaped electrode 26a, which is perpendicular to the flow direction of the liquid to be treated 23, is present on the inner wall of the conduit 30, so that the electrode surface of the ring-shaped electrode 26a is generated. The pressure loss of the processing liquid 23 can be reduced, and the liquid to be processed flows smoothly in the pipeline.
Further, since the ring-shaped electrode 26a is scarcely present inside the conduit 30, dust or the like does not adhere to the electrode. Therefore,
It is possible to save the trouble of removing dust attached to the ring-shaped electrode 26a. Here, "buried" means a state in which the electrode inner surface 26b of the ring-shaped electrode 26a is provided on the inner wall of the conduit so as to contact the liquid 23 to be treated, and as shown in FIG. 2 (b), The ring-shaped electrode 26a may be slightly recessed in the conduit 30. However, if the unevenness generated on the wall surface of the conduit 30 is large, dust may be accumulated on this uneven part or pressure loss may occur, so caution is required.

FIG. 3 is a schematic explanatory view showing another structural example of the device according to the present invention, in which the flat portion 26c of the ring electrode 26a of FIG. 2 seen from the axial direction of the ring electrode 26a is a conduit. It is configured so that it is not substantially exposed to the inside from the inner wall of 30. That is, as shown in FIG. 3 (a), the ring electrode 26a is connected to the conduit 30.
It can be buried so that it is not substantially exposed inside, or Fig. 3 (b)
As described above, the thin ring-shaped electrode 26a is disposed so as to be in close contact with the inner wall surface of the conduit 30, and is not substantially exposed inside the conduit 30. Here, "substantially" means that dust is attached to a part of the ring-shaped electrode 26a protruding from the conduit 30 or pressure loss is not applied to the liquid 23 to be treated by the protruding part. This means that some protrusion is acceptable. Specifically, the difference between the inner surface 26b of the ring-shaped electrode 26a and the inner wall of the conduit 30 may be about 10 mm or less.

FIG. 4 is a schematic explanatory view schematically showing another structural example according to the present invention, in which a linear electrode 28 is used instead of a rod-shaped electrode, a pipe 30 and the pipe 30. 2 is the same as FIG. 2 except that there is no step at the connection with the liquid to be treated introduction pipe 31 connected to. In this way, by connecting the liquid to be treated introducing pipe 31 having the same inner diameter as the pipe line 30, the step generated at the joint can be eliminated, so that the amount of dust accumulated on the step can be reduced. At the same time, it is possible to reduce the pressure loss of the liquid 23 to be treated due to the step. For example, as you can see in Figure 4, conduit 3
If the inner diameter of 0 and the inner diameter of the liquid to be treated 32 are different from each other, a step is generated at this joint, so that dust is accumulated on the step and pressure loss of the liquid to be treated 23 occurs.

Incidentally, in FIG. 4, the pipe 30 and the liquid to be treated introduction pipe 3 are provided.
Although the step formed at the joint with 1 is eliminated, the step formed at the joint between the conduit 30 and the liquid to be treated 32 may be eliminated (not shown). The most preferable configuration is to eliminate the step generated at the joint between the pipe 30 and both the liquid to be treated introduction pipe 31 and the liquid to be treated discharge pipe 32.

Further, in FIG. 4, by using the linear electrode 28, the reforming efficiency of the liquid to be treated can be improved. That is, the linear electrode is effective in increasing the electric field strength, and it becomes possible to extend the streamer with a power source voltage lower than in the past, and it is easy to extend in a wide area. As a result, the supply voltage from the power supply can be suppressed to a lower voltage than before, or if the power supply voltage is the same as before, the streamer discharge spreads over a wide area, which widens the discharge processing area and increases the unit energy Will increase the amount of processing and reduce energy waste. From these viewpoints, it is recommended that the thickness of the linear electrode 28 be 1 mmφ or less.

In the above embodiments, the rod-shaped electrode 26 and the linear electrode 28 are shown as electrodes forming a pair with the ring-shaped electrode, but the pair of electrodes is not particularly limited as long as it is a linear electrode having a linear shape. Not done. Therefore, the cross section thereof may be circular, triangular, quadrangular or polygonal. The linear electrode may be hollow or solid, but it is preferable to use a solid electrode from the viewpoint of durability.

Although a ring-shaped electrode is used in FIGS. 2 to 4, the tubular electrode 29 is preferably used instead of the ring-shaped electrode as shown in FIG. Cylindrical electrode 29
By adopting, since the discharge surface is further expanded, it is possible to improve the reforming efficiency of the liquid to be treated.

In the present invention, the method of flowing the liquid to be treated is not particularly limited and may be continuous or intermittent. The direction of flowing the liquid to be treated is not particularly limited as long as it is substantially perpendicular to the radial direction of the ring-shaped or cylindrical electrode.
For example, FIG. 6 is a schematic explanatory view showing another configuration example of the present invention, in which the pipe 30 including the linear electrode 28 and the tubular electrode 29 is configured to have an inclination with respect to the horizontal plane, and Processing liquid
23 is flowing from the bottom to the top. In this way, the liquid to be treated
By flowing 23 from below, it becomes easy to control the water level of the liquid 23 to be treated, and the possibility that air discharge may occur between the linear electrode 28 and the cylindrical electrode 29 can be reduced.

The sectional shape of the conduit used in the present invention is not particularly limited, but a circular shape is recommended. For example, as can be seen from FIGS. 7 (a-1) [Conventional example] and (a-2) [Invention example], in the case of the conduit 30a having a quadrangular cross section,
Even if the ring-shaped or cylindrical electrode 34 is configured so that the flat surface portion of the ring-shaped or cylindrical electrode 34 viewed from the axial direction is not exposed to the inside from the inner wall of the conduit as much as possible, the conduit 30a having a quadrangular cross section is formed. Since there is a difference in shape between and, the ring-shaped or cylindrical electrode 34 is exposed in many portions inside the conduit 30a. That is, the effect of the present invention cannot be sufficiently obtained.

On the other hand, as shown in FIGS. 7 (b-1) and 7 (b-2),
When the conduit 30b having a circular cross-sectional shape is used, the ring-shaped or cylindrical electrode 34 also has a circular cross-sectional shape.
Rather than disposing the ring-shaped or cylindrical electrode 34 inside the conduit 30b as shown in (b-1)], the ring-shaped or cylindrical electrode 34 as shown in the example of the present invention [FIG. 7 (b-2)] By arranging, the ring-shaped or cylindrical electrode 34 is not substantially exposed inside the conduit 30b. Therefore, the pressure loss of the liquid to be treated caused by the ring-shaped or cylindrical electrode 34 can be reduced, and the amount of dust attached to the electrode can be reduced.

In the present invention, the material of the electrode is not particularly limited, and materials such as Fe and Cu can be used.
SUS or W, which has a relatively high melting point from the viewpoint of electrode wear
Is preferably used.

[0025]

When the above configuration is adopted, when the pulsed electric power is supplied between the electrodes to reform the liquid existing between the electrodes, even if the operation is continued for a long period of time, the pressure loss and dust of the liquid to be treated are prevented. It is possible to provide a liquid treatment device that can supply stable discharge without the adherence of liquid.

[Brief description of drawings]

FIG. 1 is a schematic explanatory view showing an example of an arrangement state of electrodes and a discharge state in a conventional reforming tank.

FIG. 2 is a schematic explanatory view showing an example of the present invention.

FIG. 3 is a schematic explanatory view showing another configuration example of the present invention.

FIG. 4 is a schematic explanatory view showing another configuration example of the present invention.

FIG. 5 is a schematic explanatory view showing another configuration example of the present invention.

FIG. 6 is a schematic explanatory view showing another configuration example of the present invention.

FIG. 7 is a plan view for explaining the arrangement of the cross-sectional shape of the conduit and the ring-shaped or cylindrical electrode.

[Explanation of symbols]

22 reforming tank 23 Liquid to be treated 24 discharge 25 bar electrode 26,26a Ring electrode 26b Inner surface of ring electrode 26c Flat surface of ring electrode 27 High voltage pulse power supply 28 wire electrode 29 Cylindrical electrode 30 pipelines 30a Pipe with a square cross section 30b Pipe with circular cross section 31 Pipe for introducing liquid to be treated 32 Pipe for discharging liquid to be treated 33 Linear electrode 34 Ring or tubular electrode

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Masahiko Miura             1-5-5 Takatsukadai, Nishi-ku, Kobe City Stock Association             Company Kobe Steel Works, Kobe Research Institute F-term (reference) 4D061 DA03 DA08 DB01 DB19 DC03                       DC04 DC09 EA15 EB01 EB14                       EB17 EB19 EB31 EB34

Claims (3)

[Claims] 1. A liquid to be treated is continuously or intermittently supplied into a pipe line, and a ring-shaped or cylindrical electrode arranged concentrically with an inner peripheral surface of the pipe line and an axial center of the pipe line. A liquid treatment apparatus for reforming a liquid to be treated in a pipe by forming a discharge state between the pipe and the linear electrode arranged along the ring-shaped or cylindrical electrode, leaving the inner surface of the pipe A liquid processing apparatus, which is embedded in a road wall. 2. The ring-shaped or cylindrical electrode is configured such that a plane portion of the ring-shaped or cylindrical electrode viewed from the axial direction is not substantially exposed to the inside from the inner wall of the conduit. 1. The liquid processing device according to 1. 3. The liquid treatment according to claim 1, wherein there is no step at a connecting portion between the pipeline and the treated liquid introduction pipe and / or the treated liquid discharge pipe connected to the pipeline. apparatus.