JP2001300536A - Waste water treating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a waste water treating device in which a treating tank is manufactured so as to have a hermetically sealed structure at a low cost. SOLUTION: A waste water treating tank 10 is constituted such that a second electrode 12 is housed with a specified spacing in a first electrode 11 having a nearly hermetically sealed hollow shape, and the second electrode 12 is supported by the first electrode 11 via an insulator, and waste water is allowed to flow between the first electrode 11 and the second electrode 12. The first electrode 11 is tubular, preferably cylindrical, and the second electrode 12 is tubular or has a cylinder shape, preferably cylindrical or a cylinder shape being circular in the cross-section.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wastewater treatment apparatus, and more particularly to an apparatus capable of adopting a closed structure in a treatment tank and being manufactured at a low cost.

[0002]

2. Description of the Related Art When treating domestic wastewater or industrial wastewater, a biological treatment method using microorganisms and an electrolysis method using electric energy are generally employed.

In the latter electrolysis method, by applying electric energy to wastewater, a reaction occurring at a contact interface between an electrode surface and the wastewater or an adsorption reaction occurring between a deposited substance and a component in the wastewater, specifically, electrolysis, Utilizing electric reactions such as electro-deposition, electrolytic oxidation, electrolytic reduction, electrolytic neutralization, and ion exchange, the polymer inorganic matter and polymer organic matter in wastewater are reduced to low molecular weight, and BOD and COD
Although this method requires a power source as an energy source, it has an advantage that maintenance is easier than the former biological treatment method.

Heretofore, in such an electrolysis method, a system in which a plurality of flat anode plates and cathode plates are alternately arranged at appropriate intervals in a treatment tank has been widely adopted (for example, Japanese Patent Laid-Open No. 55-55).
127189, JP-A-06-296805, JP-A-06-304406, etc.).

[0005]

However, in the conventional method, when chlorine-based components and the like are contained in wastewater, not only harmful gases such as chlorine gas are generated to pollute the atmosphere, but also the electric current There is a problem that the terminals of the electrodes connecting the electrodes are easily corroded.

On the other hand, a method has been proposed in which the treatment tank is made to have a closed structure and chlorine gas is dissolved in wastewater.
It is necessary to employ a pressure-resistant container for the processing tank, which not only causes an increase in cost, but also has a problem that the structure for supporting the electrode terminals in the processing tank is complicated, and equipment maintenance becomes very complicated.

SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide a wastewater treatment apparatus which does not cause pollution of the atmosphere or corrosion of electrode terminals, and which can be manufactured simply and at low cost.

[0008]

SUMMARY OF THE INVENTION Therefore, a wastewater treatment apparatus according to the present invention is a wastewater treatment apparatus for performing treatment by applying electric energy to wastewater. A wastewater treatment tank configured to house the electrodes with a predetermined gap therebetween and to support the second electrode with respect to the first electrode via an insulating material; An energizing means for applying an electric current between the second electrodes; and
A wastewater inlet through which wastewater to be treated flows between the first electrode and the second electrode;
A treated wastewater outlet for discharging wastewater treated between the electrodes, a wastewater supply passage connected to the wastewater inlet, and a pressurizing means for supplying wastewater to the wastewater supply passage by pressurizing the wastewater, A discharge passage connected to the treated wastewater discharge port,
It is characterized by having.

One of the features of the present invention is that the first electrode is formed in a substantially closed hollow shape, and the second electrode is inserted into the first electrode to constitute a wastewater treatment tank. is there. Thus, even when the wastewater contains a chlorine-based component or the like, no harmful gas such as generated chlorine gas is released to the environment as it is, and the connection terminals of the electrodes are not corroded.

In addition, since the wastewater treatment tank itself is used as an electrode, the cost does not increase as in the case of using a pressure-resistant container for the treatment tank, and the second electrode is insulated from the first electrode. Since the connection can be made via the material, the electrode support structure can be simplified, and equipment maintenance can be greatly simplified.

Further, since the waste gas is pressurized and the produced gas is dissolved in the waste water, the gas and the waste water can be easily contacted. In this case, the pressurization of the wastewater may be controlled to be constant at a predetermined pressure, but the pressure may be varied. However, if the wastewater is constantly pressurized, gases other than oxygen are also dissolved in the wastewater, and the wastewater is almost saturated, and the reaction efficiency is reduced. If a gas other than oxygen is present in the wastewater, it is considered that the reaction between oxygen and the treatment substance is deteriorated. Therefore, if the pressure is changed to a normal pressure once or intermittently at regular intervals, the gas dissolved in the wastewater is vaporized and exhausted to the outside, and the oxygen in the wastewater is regenerated with oxygen newly generated. It can encourage binding.

That is, the pressurizing means may pressurize the wastewater at a predetermined constant pressure, or may vary the pressure applied to the wastewater.

A single wastewater treatment tank can be provided for batchwise wastewater treatment. However, if a large amount of wastewater is to be treated efficiently, a plurality of wastewater treatment tanks can be provided for continuous treatment. .

That is, a plurality of wastewater treatment tanks are provided, and a plurality of wastewater treatment tanks are connected in series by sequentially connecting a wastewater supply passage of the next wastewater treatment tank to a discharge passage of each of the plurality of wastewater treatment tanks. To form a wastewater treatment tank group.

[0015] The treated wastewater leaving the wastewater treatment tank may be directly transferred to the next step. However, in order to more completely treat the wastewater, a part of the treated wastewater is transferred to the wastewater treatment tank. It can be returned and processed.

That is, a wastewater circulation passage is connected between the wastewater supply passage and the discharge passage, and the wastewater circulation passage is provided with a circulation pump for circulating a part of the treated wastewater in the discharge passage to the wastewater supply passage. It is better to

Although the wastewater treatment apparatus according to the present invention is new and novel, the wastewater treatment tank employed in such a wastewater treatment apparatus is also novel and novel, and the present invention provides such a wastewater treatment tank. Can be.

The wastewater treatment tank according to the present invention has a cylindrical shape having a substantially uniform inner diameter in the longitudinal direction, and has a substantially closed structure.
And a cylindrical or rod-like shape having a substantially uniform outer diameter in the longitudinal direction, accommodated in the first electrode with a predetermined gap, and supported by the first electrode via an insulating member. A second electrode, a wastewater inlet through which wastewater to be treated flows between the first electrode and the second electrode, and a wastewater inlet treated between the first electrode and the second electrode. And a treated wastewater discharge port for discharging wastewater.

When the wastewater is treated with electric energy, the treatment efficiency of the wastewater is reduced at a position distant from the electrode surface by 3 mm or more, and the wastewater may flow without being treated. Therefore, in order to treat wastewater efficiently, it is desirable that the electrodes be held in a predetermined narrow dimension with high precision and parallel to each other. However, when flat electrodes are employed as in a conventional wastewater treatment system, it is difficult to keep adjacent electrode plates parallel to each other. In the present invention, since the first electrode is formed in a cylindrical shape and the second electrode is formed in a cylindrical or rod-like shape, the first and second electrodes are formed at a predetermined narrow interval with high precision and parallel to each other. Can be held.

The first and second electrodes may have a rectangular cylindrical shape or another polygonal cylindrical shape, but if they are cylindrical, the first and second electrodes can be assembled more easily and in parallel with each other. . That is, when the first and second electrodes are formed in a cylindrical shape, and the first and second electrodes are arranged so that the central axes thereof are aligned with each other,
The parallelism between the two can be more accurately guaranteed.

The wastewater inlet and the treated wastewater outlet may be provided in any manner as long as the wastewater to be treated can flow between the first and second electrodes. When employing the first and second electrodes, one end of the second electrode is preferably opened to serve as a wastewater inlet or a treated wastewater outlet.

That is, one end of the second electrode is opened to form a wastewater inlet, while the other end of the second electrode is formed with a wastewater inlet, and the first electrode is a treated wastewater outlet. Can be formed so that the wastewater introduced from the wastewater introduction port flows between the first and second electrodes.

In addition, one end of the second electrode is opened to form a treated wastewater discharge port, while a wastewater inlet is formed at the other end of the second electrode, and a wastewater inlet is formed at the first electrode. Can be formed so that the wastewater flowing between the first and second electrodes is introduced into the second electrode from the wastewater inlet.

When the second electrode is not cylindrical but rod-shaped, the first electrode has a cylindrical shape in order to ensure high parallelism between the electrode surfaces of the first and second electrodes. Preferably, the second electrode has a rod shape with a circular cross section, and the first and second electrodes are arranged so that their central axes coincide.

When a rod-shaped second electrode is employed,
It is preferable to form a wastewater inlet at one end of the first electrode and a treated wastewater outlet at the other end of the first electrode. The same can be applied to the case where is adopted.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to specific examples shown in the drawings. FIG. 1 shows a preferred embodiment of the wastewater treatment apparatus according to the present invention. In the figure, a wastewater treatment tank 10 is configured in a substantially closed structure by combining a first electrode 11 and a second electrode 12.

The first electrode 11 is manufactured using a stainless steel circular pipe having a uniform inner and outer diameter in the longitudinal direction. A cylindrical fitting 13 constituting a part of the electrode is fitted into the upper end of the first electrode 11, and a treated wastewater discharge port 14 is formed in the tubular fitting 13.

A deformable cylindrical support member 15 is connected to the upper end of the cylindrical member 13 by a connecting piece 16.
A metal sealing piece 17 is fitted into the upper end of 5.

On the other hand, the second electrode 12 is manufactured using a stainless steel circular pipe having a smaller diameter than the first electrode 11 and having a substantially uniform inner and outer diameter in the longitudinal direction. One electrode 11 is inserted into the second electrode 12
Is projected from the first electrode 11.

A cylindrical body (insulating material) 18 made of synthetic resin is interposed between the second electrode 12 and the sealing piece 17, and the cylindrical body 18 is prevented from coming off by an O-ring 19,
A cap 20 made of a synthetic resin is fitted above 9, and thus the upper side of the first electrode 11 is sealed.

A titanium pipe 21 is connected to the upper end of the second electrode 12 in the cylindrical body 18, and the upper end of the titanium pipe 21 is opened to serve as a wastewater inlet.
A cylindrical connecting member 22 is connected to the wastewater inlet, and a wastewater supply pipe (wastewater supply passage) is connected to the connection bracket 22.
One end of the wastewater supply pipe 23 is connected, and a pressurizing pump (pressurizing means) 24 is interposed at the other end of the wastewater supply pipe 23, and the other end of the wastewater supply pipe 23 reaches a wastewater tank 25.

A waste water inlet 26 is opened at the lower end of the second electrode 12 so that waste water flowing through the second electrode 12 is introduced between the first and second electrodes 11 and 12. It has become.

On the other hand, a sealing lid 27 made of a synthetic resin is fitted to the lower end of the first electrode 11, and the first and second electrodes 11,
Spacer 12 made of synthetic resin (insulating material) between lower ends of 12
28, and thus the first and second electrodes 11, 12
Are arranged so that their central axes coincide with each other, and a predetermined gap between them, for example, a gap of about 3 mm, is substantially equally spaced in the longitudinal direction.

One end of a discharge pipe (discharge passage) 29 is connected to the treated waste water discharge port 14 of the first electrode 11, and the other end of the discharge pipe 29 is a closing valve 30 used for draining waste water. Is provided from the upstream side of the closing valve 30.
Is provided in a branched manner, a filter 32 is provided in the middle of the second discharge pipe 31, and the other end of the second discharge pipe 31 reaches a treated drain tank 33.

The negative electrode 34 is connected to the first electrode 11.
Are connected, and the + side electric wire 35 is connected to the second electrode 12. If the insulation of the first electrode 11 with respect to the outside can be ensured, the first electrode 11 has + and the second electrode 1 has
Alternatively,-may be applied to 2 or an alternating current may be applied between the electrodes 11 and 12.

When treating wastewater, the first and second electrodes 1
While a predetermined current is passed between 1 and 12, the pressurizing pump 24 is operated. Then, the wastewater in the wastewater tank 25 is pressurized to a predetermined pressure, for example, 6 kg / cm ² , and supplied to the second electrode 12 via the wastewater introduction pipe 23, the connection bracket 22, and the titanium pipe 21.

The wastewater supplied to the second electrode 12 flows through the second electrode 12 and flows from the wastewater inlet 26 into the gap between the first and second electrodes 11 and 12, and the first and second wastewater flows into the gap between the first and second electrodes 11 and 12. Between the electrodes 11 and 12.

While the wastewater is flowing between the first and second electrodes 11 and 12, electric energy is given to the wastewater from the first and second electrodes 11 and 12, and high-molecular-weight inorganic substances and polymers in the wastewater are provided. Organic matter is depolymerized, and the treated wastewater is sent from the treated wastewater discharge port 14 to the treated wastewater tank 33 via the discharge pipe 29, the filter 32, and the second discharge pipe 31, and stored therein.

FIG. 2 shows a second embodiment, in which the same reference numerals as in FIG. 1 denote the same or corresponding parts. In this example, a wastewater circulation pipe (wastewater circulation passage) 36 is connected between the wastewater supply pipe 23 and the discharge pipe 29, and the wastewater circulation pipe 3
A circulation pump 37 is provided in the middle of 6.

In this embodiment, a part of the electrolytically treated wastewater is returned to the wastewater supply pipe 23 via the wastewater circulation pipe 36 and the circulation pump 37, and is treated again between the first and second electrodes 11, 12. As a result, wastewater is more reliably treated.

FIG. 3 shows a third embodiment. In this example, a plurality of first to n-th wastewater treatment tanks 10 are provided, a wastewater supply pipe 23 is connected to a wastewater inlet 38 of the first wastewater treatment tank 10, and a first wastewater treatment tank is provided. One end of a discharge pipe 31 is connected to the treated wastewater discharge port 10 of 10, and the other end of the discharge pipe 31 is connected to a wastewater inlet 38 of the second wastewater treatment tank 10 as a wastewater supply pipe 23,
Such a connection method is similarly employed up to the nth wastewater treatment tank 10, and thus a wastewater treatment tank group in which a plurality of wastewater treatment tanks 10 are serially connected is formed.

When a plurality of wastewater treatment tanks 10 are connected in series as described above to continuously treat wastewater,
A large amount of wastewater can be treated efficiently.

FIG. 4 shows a fourth embodiment, in which the same reference numerals as in FIGS. 1 to 3 denote the same or corresponding parts.
In this example, a wastewater inlet 38 is formed at the lower end side of the first electrode 11, and wastewater that has entered through the wastewater inlet 38 is allowed to flow between the first and second electrodes 11 and 12. The wastewater is discharged from the treated wastewater discharge port 14 on the upper end side.

In the fourth embodiment, the wastewater inlet 38 and the treated wastewater outlet 14 may be arranged oppositely.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a preferred embodiment of a wastewater treatment apparatus according to the present invention.

FIG. 2 is a configuration diagram showing a second embodiment.

FIG. 3 is a configuration diagram illustrating a third embodiment.

FIG. 4 is a configuration diagram showing a fourth embodiment.

[Explanation of symbols]

 Reference Signs List 10 wastewater treatment tank 11 first electrode 12 second electrode 14 treated wastewater outlet 23 wastewater supply pipe (wastewater supply passage) 24 pressurizing pump (pressurizing means) 29 discharge pump (discharge passage) 36 wastewater circulation pipe ( (Wastewater circulation passage) 37 Circulation pump 38 Wastewater inlet

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Yoshihiko Yamashita 6-340 Hattorigawa, Yao-shi, Osaka F-term (reference) 4D061 DA08 DB19 DC11 DC13 DC13 EA03 EA04 EB04 EB14 EB19 EB28 EB30 EB33 FA13

Claims (11)

[Claims] 1. A wastewater treatment apparatus for treating wastewater by applying electric energy to a wastewater, wherein a second electrode is accommodated in a substantially closed hollow first electrode with a predetermined gap, and the second electrode is accommodated in the second electrode. A wastewater treatment tank configured to support the electrode with respect to the first electrode via an insulating material, an energizing means for applying an electric current between the first and second electrodes of the wastewater treatment tank, A wastewater inlet provided in the wastewater treatment tank to allow wastewater to be treated to flow between the first electrode and the second electrode; and a first electrode and a second electrode provided in the wastewater treatment tank. A treated wastewater discharge outlet for discharging treated wastewater between the electrodes, a wastewater supply passage connected to the wastewater inlet, and a pressurizing means for pressurizing and supplying wastewater to the wastewater supply passage. And a discharge passage connected to the treated wastewater discharge port. Wastewater treatment device according to. 2. The wastewater treatment apparatus according to claim 1, wherein said pressurizing means pressurizes the wastewater with a predetermined constant pressure. 3. The wastewater treatment apparatus according to claim 1, wherein said pressurizing means changes the pressure applied to the wastewater. 4. A plurality of wastewater treatment tanks are provided, and a plurality of wastewater treatment tanks are connected in series by sequentially connecting a wastewater supply passage of a next wastewater treatment tank to a discharge passage of each of the plurality of wastewater treatment tanks. The wastewater treatment apparatus according to claim 1, which constitutes a wastewater treatment tank group connected to the wastewater treatment tank. 5. A wastewater circulation passage is connected between the wastewater supply passage and the discharge passage, and the wastewater circulation passage circulates a part of the treated wastewater in the discharge passage to the wastewater supply passage. 5. The wastewater treatment device according to claim 1, further comprising a pump. 6. A first electrode having a substantially uniform inner diameter in a longitudinal direction and having a substantially hermetically sealed structure, and a first electrode having a substantially uniform outer diameter in a longitudinal direction having a cylindrical or rod shape. It is housed with a predetermined gap in the electrode,
A second electrode supported on the first electrode via an insulating member; a wastewater inlet for flowing wastewater to be treated between the first electrode and the second electrode; A wastewater treatment tank, comprising: a treated wastewater discharge port for discharging treated wastewater between the electrode and the second electrode. 7. The device according to claim 6, wherein the first electrode has a cylindrical shape, the second electrode has a cylindrical shape, and the first and second electrodes are arranged with their central axes aligned. Wastewater treatment tank. 8. An end of the second electrode is opened to serve as the wastewater inlet, while a wastewater inlet is formed at the other end of the second electrode. 8. The wastewater treatment tank according to claim 6, wherein the treated wastewater discharge port is formed so that wastewater introduced from the wastewater inlet port flows between the first and second electrodes. 9. An end of the second electrode is opened to serve as the treated wastewater discharge port, while a wastewater inlet is formed at the other end of the second electrode. The wastewater treatment according to claim 6 or 7, wherein the wastewater inlet is formed in the electrode so that wastewater flowing between the first and second electrodes is introduced into the second electrode from the wastewater inlet. Tank. 10. The first electrode has a cylindrical shape, the second electrode has a rod shape with a circular cross section, and the first and second electrodes are arranged so that their central axes coincide with each other. 6. The wastewater treatment tank according to 6. 11. The wastewater inflow port is formed at one end of the first electrode, and the treated wastewater discharge port is formed at the other end of the first electrode. A wastewater treatment tank according to any one of Claims 10 to 10.