JPH01127012A - Electrode of electroosmosis type dehydrator - Google Patents

Abstract

PURPOSE:To prevent generation of electrical short circuit by weaving conductive wire rods and insulated wire rods while making one hand as warp and the other hand as weft and forming a net. CONSTITUTION:A belt-shaped net 15 is woven by using conductive wire rods 13 as weft and insulated wire rods 14 as warp. The conductive wire rods 13 arranged in a straight-line state are woven to the central layer of the net so that these are wrapt with the insulated wire rods 14 as core rods. The insulated wire rods 14 are arranged on the outer faces of the surface and rear of the net 15 and therefore the conductive wire rods 13 are not projected to the surface of the net. Thereby electrical short circuit can be surely prevented from being generated between electrodes made of the belt in itself and also maintenance is made simple.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electrode structure for an electroosmotic dehydrator used for dewatering sludge generated in sewage treatment plants and the like.

[Conventional technology]

As a typical example of the electroosmotic dewatering machine mentioned above, a belt press type as shown in Fig. 3 has been known for a long time. A conveyor belt that also serves as a cathode electrode is stretched between a pair of rollers 4 along the line, 5 is a drive motor for the conveyor belt 2, and 6 is a conveyor belt stretched between a pair of rollers so as to face the belt 2 across the slurry path 3. A press belt 8, which also serves as an anode side electrode, is a DC power supply that applies a voltage to the belt 6.2, which also serves as the anodic side electrode and the cathode side electrode. Each of the belts 2.6 is a caterpillar-shaped belt with drainage and gas venting grooves made of a conductive material such as highly corrosion-resistant metal or carbon, or a net-shaped belt made of GITM material. It has been adopted.

The dewatering action of such an electro-osmotic dewatering machine is well known, and with a voltage applied to each belt 2.6 from a power source 8 and a drive motor 5 driving the conveyor belt 2, the dehydrated material is transferred from the hopper 1 to the slurry path 3. By supplying sludge 9, which is a treated product,
In the process of belt conveyance from the inlet side to the outlet side in the slurry passage 3, the sludge is sandwiched between the conveyor belt 2 and the press belt 6 and subjected to squeezing force, forming between the opposing electric bridges. Electroosmotic action based on the electric field is added. Therefore, the water contained in the sludge is positively charged and flows toward the cathode, and the squeezing force causes the transport belt to
permeates and is drained out of the system.

As a result, the sludge 9 is dehydrated and discharged as a dehydrated cake 10 from the outlet of the slurry passage 3. Furthermore, gas generated by electrolyzing components in the sludge during the electroosmosis described above also permeates through the belt 2.6 and is released.

In addition, in order to compensate for the volume reduction of the sludge 9 due to the progress of dewatering in the dewatering step and apply sufficient squeezing force throughout the slurry passage, and at the same time to obtain a good distribution of electricity to the sludge throughout the slurry passage, In the slurry passage 3, the press belt 6 is arranged at an angle with respect to the conveyor belt 2 so that the cross section of the passage between the electrodes is narrower on the outlet side than on the inlet side. In addition, in an actual electroosmotic dehydrator, considering the electrical resistance of sludge and the increase in electrical resistance of sludge as dewatering progresses, the interval between the belts is approximately 10III on the entrance side of the slurry passage 3, and 51mm on the exit side. It is set to about.

On the other hand, as mentioned above, in actual dehydrators, the distance between the belts 2 and 6, which also serve as electrodes and face each other across the slurry passage 3, is set to a narrow distance of about 5 to 10+im, so long-term operation is difficult. If the belt 2.6 becomes slack due to this, or if the support structure on the roller 4.7 side where the belts 2, 6 are hung is bent, and the relative position between the belts shifts, the belt 6 on the anode side and the cathode side may become loose. The side belts 2 may come into direct contact with each other, causing an electrical short circuit.

Moreover, if a short circuit occurs due to direct contact between the electrodes, a large current will concentrate in this short circuit area, making it impossible to perform normal electroosmotic dehydration, and may also damage the power supply side and the belt itself, which also serves as an electrode. This may lead to damage.

Conventionally, as a safety measure for this purpose, a large number of insulating ropes 11 are stretched along the surface of the conveyor belt 2 in the slurry passage as shown in FIG. 4, or a belt 2. An insulating belt-shaped filter cloth 12 is superimposed on the surface of the belt, thereby ensuring the drainage and exhaust gas functions of the belts 2 and 6, while preventing an electrical short circuit if the belts 2 and 6 accidentally come into direct contact with each other. We are taking measures to prevent this from happening.

[Problem that the invention seeks to solve]

However, the conventional short-circuit accident prevention structure shown in FIGS. 4 and 5 has the following drawbacks.

That is, belt 2. or another insulation row 111 in 6,
Alternatively, in a structure in which an insulating filter cloth 12 is added, a part of the gap between the belts defining the slurry passage 3 is replaced by an insulating rope 11.
Since the insulating filter cloth 12 occupies and covers the electric rod surface, the slurry passage 3 is spatially restricted, and the electrical resistance between the electric rods increases substantially, reducing the consumption required for electroosmotic dewatering. The amount of electricity increases.

Furthermore, if a rope, filter cloth, etc. are simply placed on the belt, external forces may cause the belt, rope, or filter cloth to become misaligned or uneven during operation, resulting in the belt falling off the belt. The holding structure to prevent this is complicated and its maintenance management is also troublesome.

This invention was made in consideration of the above points, and its purpose is to treat wastewater and exhaust gas accompanying the progress of dehydration.

And capture sludge particles! ! This method does not impair functionality in the slightest, and does not require a special intervening insulating member to prevent short circuits between the belts that serve as both the I and Pi, as in the conventional method, when the opposing electrodes come into direct contact due to slack in the belt, etc. However, it is an object of the present invention to provide an electrode for an electroosmotic dehydrator that can reliably prevent the occurrence of electrical short circuits.

(Means for Solving the Problems) In order to solve the above problems, according to the present invention, one of the electric shock wire material and the insulated wire material is a warp thread and the other is a weft thread as a woven net, and at least a slurry wire material is woven. On the side facing the passage, the conductive wire is woven inside the insulated wire so that it does not protrude toward the neft surface.

[Effect]

In the above structure, the cotton material of the conductor 1 is a metal wire with high corrosion resistance, the insulating wire is a synthetic thread of mm diameter, and the belt-like device is woven using the linearly stretched metal wire as the weft thread and the insulating wire as the warp thread. It is something that

Therefore, by adopting the above-mentioned belt-like net for the sludge conveyance belt and press belt that also serve as electrodes, even if the belts on the anode side and cathode side come into direct contact with each other due to slack in the belt during operation, Ii that composes the net!
Only by touching the edge wires, the conductive wires do not come into contact with each other, and electrical short circuits can be prevented. Furthermore, most of the conductive wire is exposed on the net surface, and in the electroosmotic dehydration process, the exposed portion of the conductive wire comes into contact with the sludge, ensuring sufficient electrical conduction to the sludge. However, this net is woven so that the conductive wire material and the insulated wire material are integrated, so that the conductive wire material and the insulated wire material do not come apart due to external force, and the weave density is selected appropriately. By doing so, it is possible to have a good collector for drainage, exhaust gas, and sludge molecules.

〔Example〕

1 and 2 are a plan view and a cross-sectional view showing the structure of an electrode organized into a belt-like net according to an embodiment of the present invention. In the figures, 13 is a conducting wire, 14 is an insulating wire, and weft,
A belt-like net 15 is woven which serves as warp threads and also as electrodes.

Here, we will describe an example produced by the inventor.
! The gland material 13 is made of stainless steel with high corrosion resistance.
, a stranded wire made by bundling and twisting seven m-wires of 1T+imφ, and a nylon multifilament yarn made by twisting together four threads made by bundling 15 14-denier nylon fibers as the insulated wire 14, which becomes the warp thread. And the weave density of the weft is 3
A belt-like net 15 having a thickness of 0.71 mm was produced by weaving the conductive wire material 13 with the weft threads stretched linearly at a weaving density of 1 thread/1 inch and a weaving density of m threads of 52 threads/1 inch.

The net 15 woven in this way is woven in the center of one layer of the net so that the conductive wires 13 lined up in a straight line serve as core wires and are wrapped around the insulating wires 14, as shown in the cross section of FIG. Insulated wires 14 are lined up on the front and back outer surfaces of the net 15, so that the conductive wires 13 do not protrude to the net surface, and the air permeability of this net is 3.
It was 0cc/d/sec.

Next, the net 15 is transferred to the conveyor belt 2 which also serves as an electrode in the belt press type electroosmotic dehydrator shown in FIG. According to the results of dehydrating sludge using the press belt 6, sludge particles are collected on the surface of the net 15 to prevent sludge from leaking, while at the same time water flowing onto the electrode surface due to electroosmosis, Sufficient drainage for gas generated by electrolysis,
It was confirmed that the exhaust gas function was secured and that efficient dehydration performance was obtained. This is because an appropriate gap exists between the warp and the weft to prevent the permeation of sludge particles and provide drainage and exhaust gas functions, and the conductive wire 13 that is involved in the current carrying function is as shown in the plan view of FIG. This is because most of the area is exposed on the slurry passage side.

In addition, during the dehydration operation, the press belt 6 on the cathode side and the conveyor belt 2 on the cathode side were intentionally loosened so that the belts came into contact with each other, but no electrical short circuit occurred and sufficient safety was confirmed. . This is because the conductive wire 13 does not protrude from the net surface as mentioned above, and when the belts come into contact with each other, the net 15
This is to prevent the insulated wires 14 from butting against each other and the conductive wires 13 from contacting each other. Moreover, even after long-term operation under severe load conditions, there is no disturbance in the arrangement of the warp and weft threads of the net 15, and in addition to the function of supplying electricity to the sludge as an electrode, the function of drainage, exhaust gas, and prevention of electrical short circuits is excellent. It has been confirmed that it will be maintained.

〔Effect of the invention〕

As described above, according to the present invention, a conductive wire material is provided.

The net is woven with one side of the insulated wire as the warp and the other as the weft, and the electrode is woven inside the insulated wire so that the conductive wire does not protrude to the net surface on the side facing the slurry passage. With this configuration, the electrode has a good ability to conduct electricity to sludge, which is required for an electrode, as well as the ability to collect and drain sludge particles.

While ensuring the exhaust gas function, even if the belts on the anode side and the cathode side, which also serve as electrodes, come into direct contact with each other during operation, the belt itself can reliably prevent an electrical short circuit from occurring between the electrodes. Moreover, there is no need to interpose a separate insulating member between the electrodes as in the conventional short-circuit prevention measures, and there is an advantage that the structure and maintenance of the electroosmotic dehydrator can be simplified.

[Brief explanation of the drawing]

Fig. 1 is a plan view of an electrode structure according to an embodiment of the present invention, Fig. 2 is a sectional view of Fig. 1, Fig. 3 is a configuration diagram of a belt press type electroosmotic dehydrator, and Figs. 4 and 5 are respectively Arrow view X-X in Fig. 3 showing the conventional short-circuit prevention measures between electrodes
FIG. In each figure, l: hopper for supplying sludge, 2: conveyor belt that also serves as a cathode side electrode, 3 nisler passage, 6: press belt that also serves as an anode side electrode, 8: power supply, 9: sludge, 10: dehydrated cake. ,1
3: Conductive 1M wire, 14: Insulated wire, Fig. 1 Fig. 2

Claims (1)

[Scope of Claims] 1) An electroosmotic dewatering machine in which an anode side electrode and a cathode side electrode are arranged facing each other with a slurry passageway in between, and electroosmotic dehydration is performed on sludge supplied to the slurry passageway with a voltage applied between the electrodes. The electrode is made of a net woven with conductive wires and insulated wires, one of which is the warp and the other is the weft, and is insulated so that the conductive wire does not protrude into the net surface at least on the side facing the slurry passage. An electrode for an electroosmotic dehydrator characterized by being woven inside the wire. 2) In the electrode according to claim 1, the conductive wire is a highly corrosion-resistant metal wire, and the insulating wire is a synthetic fiber thread, and the linearly stretched metal wire is used as the weft and the insulated wire is used as the warp. An electrode for an electroosmotic dehydrator characterized by being a belt-like net woven with