JP2002248475A - Electrolytic cell for sewage treatment apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electrolytic cell for a sewage treatment apparatus constituted so that electrode attaching and detaching work is facilitated by making the wiring between power supply and electrodes in order with effectively using the dead space in the apparatus. SOLUTION: The electrolytic cell for the sewage treatment apparatus is equipped with a tank provided for sewage treatment and having an inclined surface part under at least one side wall thereof, a plurality of electrode units, each of which has a pair of electrodes opposed to each other and arranged in the tank, the air diffusion pipe arranged under the surface of the sewage in the tank, the relay terminal to which the electrode units are electrically connected and the power supply for supplying a current to the electrode units through the relay terminal. The relay terminal is arranged at a position above the surface of the sewage in the upper part of the inclined surface part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to an electrolytic cell for a sewage treatment apparatus, and more particularly to an electrolytic cell for a sewage treatment apparatus for removing phosphorus.

[0002]

2. Description of the Related Art Conventional sewage treatment equipment, especially business in factories and the like
Aims to remove phosphorus compounds contained in wastewater from homes and domestic wastewater.
For example, Japanese Patent Application Laid-Open No. 3-89 describes a target wastewater treatment apparatus.
998, JP-A-6-254584 and JP-A-6-254584.
10-192869, JP-A-10-258283
JP, JP 2000-176456 A, JP
The electric power described in JP-A-2000-189977 and the like.
Dissolution and elution methods are known. This technology uses an electrode
Dissolution reaction, such as iron ion or aluminum ion
Metal ions are eluted into the wastewater, and this metal ion is drained.
Insoluble by reacting with phosphate ions
(For example, FePO_Four, Fe (OH)_x(PO _Four)_y)age
By coagulation and precipitation to remove the phosphorus compound.

As an electrolytic cell used in such a sewage treatment apparatus, for example, Japanese Patent Application Laid-Open No. Hei 10-2582 is used.
As disclosed in FIG. 4 of JP-A-83, there is a device using a plurality of electrodes depending on the amount of sewage treatment. In this device, however, a cable is directly connected individually to each electrode from one power supply. In addition, the lower part of the side surface of the electrolytic cell may be, for example, an inclined surface portion as described in FIG. 2 of JP-A-2000-189977. In addition,
In this case, the inclined surface portion is for collecting sludge made of a phosphorus compound, which is agglomerated by reaction of metal ions eluted from the electrode, and sludge sent from the activated sludge tank in the previous step.

[0004]

However, in the former electrolytic cell, there is a problem that the wiring connecting the power supply and each electrode becomes congested, and the work of attaching and detaching the electrodes becomes difficult. In an electrolytic cell such as the latter,
The upper part of the inclined surface was not effectively used, and was a dead space.

The present invention has been made by paying attention to such problems existing in the prior art. An object of the present invention is to provide an electrolytic cell for a sewage treatment apparatus, in which the dead space in the apparatus is effectively used to make the wiring between the power supply and the electrodes orderly, thereby facilitating the attachment / detachment work of the electrodes.

[0006]

In order to achieve the above object, an electrolytic cell for a sewage treatment apparatus according to the present invention is provided for sewage treatment and has a tank having an inclined surface portion below at least one side wall; An electrode unit having a pair of electrodes facing each other, a plurality of electrode units disposed in the tank, an air diffuser disposed below a sewage surface in the tank, and each of the electrode units is electrically connected. And a power supply for supplying a current to the electrode unit via the relay terminal, wherein the relay terminal is disposed at a position above a sewage surface in an upper portion of the inclined surface portion.

According to this structure, each electrode unit can be connected to a power supply by connecting a power cable to a relay terminal located near the electrode unit. Power cables can be shortened, and congested wiring can be avoided. Therefore, the attachment and detachment of the power supply cable of the electrode unit becomes easy, and the attachment and detachment work of the electrode unit becomes easy because the power supply cable does not become bulky. In addition, the space above the inclined surface of the tank body is effectively used, and the device itself can be compactly assembled.

[0008] In the above, the inclined surface portion may be formed near the electrode. According to this structure, in addition to the rise of air bubbles discharged from the air diffuser, convection of sewage occurs in the tank because the inclined surface and the electrode are close to each other. For this reason, the compound generated by reacting with the ions eluted from the electrode can be efficiently suspended by the convection and discharged out of the electrolytic cell. In addition, since the relay terminal and the inclined surface are arranged near the electrode unit, the electrolytic cell can be formed more compact.

Further, the electrolytic cell for a sewage treatment apparatus according to the present invention is provided on one side of the tank and has a sewage inflow port into which sewage flows and a sewage outflow port provided on the other side of the tank and through which sewage flows out. And an electrode unit having a pair of electrodes facing each other and arranged in the tank in a plurality of two rows in a direction substantially perpendicular to the flow direction of the sewage, and disposed below the surface of the sewage in the tank. A diffuser tube, a relay terminal to which the electrode unit is electrically connected, and a power supply for supplying a current to the electrode unit via the relay terminal, and an electrode of the electrode unit row on the sewage inflow side. An inclined surface portion may be formed in the vicinity of and below the tank near the electrode of the electrode unit row on the sewage outlet side, and the relay terminal may be disposed at a position above the sewage surface in an upper portion of each inclined surface portion. Good.

[0010] With this configuration, in addition to the rise of air bubbles discharged from the air diffuser, convection of sewage occurs in the tank because the inclined surface and the electrode are close to each other.
For this reason, the compound generated by reacting with the ions eluted from the electrode can be efficiently suspended by the convection and discharged out of the electrolytic cell. Further, since the convection direction of the sewage generated by the interaction between the air diffuser and the inclined surface portion and the flow direction of the sewage flowing from the sewage inlet to the sewage outlet are in the same direction, the floating phosphorus compound is further reduced. It can be efficiently discharged from the electrolytic cell. In addition, when attaching / detaching each electrode unit, the power supply wiring of each electrode unit, which needs to be attached / detached, only needs to connect the power cable to the relay terminal located near it. This makes it easy to attach and detach the power supply unit. In addition, since the electrode units are arranged in two rows instead of one row to reduce the size of the tank in the width direction, it is possible to prevent stagnation of water at the width direction end of the tank. Therefore,
It is possible to prevent the phosphorus trapping efficiency due to the ions eluted from the electrode unit at the tank end from decreasing (there is no reaction even if the ions are eluted because there is little phosphorus), and the phosphorus removal efficiency from decreasing.

Further, in the electrode unit according to the present invention, it is preferable that a longitudinal direction in a plane shape of the electrode and a side wall on which the inclined surface portion is formed are substantially orthogonal to each other. With this configuration, it is possible to prevent the convection generated by the interaction between the air diffuser and the inclined surface from being blocked by the electrodes. Furthermore, since the sewage flowing from the sewage inlet to the sewage outlet flows without being blocked by the electrode, the floating phosphorus compounds can be efficiently discharged from the electrolytic cell.

In the present invention, it is preferable that one electrode unit is connected to one relay terminal. According to this structure, since a plurality of electrode units are not connected to the same relay terminal, the wiring can be further simplified. Further, the connection to the relay terminal can be easily determined.

Further, in the present invention, a plurality of relay terminal boxes may be disposed above the sewage surface in an upper portion of the inclined surface portion, and the plurality of relay terminals may be disposed in the relay terminal box. .
With this configuration, the size of the relay terminal box can be configured as a size that is easy to handle.

In the present invention, the air diffuser may be disposed substantially parallel to the side wall on which the inclined surface is formed and at the bottom of the tank near the inclined surface. According to this structure, the flow rate of the convection of the sewage generated in the tank by the air diffuser and the inclined surface can be increased with a simple structure.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In addition,
FIG. 1 is an external plan view of the electrolytic cell according to the present embodiment,
FIG. 2 is a plan view of the electrolytic cell according to the present embodiment with the upper lid removed, and FIG. 3 is a plan view of the electrolytic cell according to the present embodiment with the upper lid and the electrode unit removed. 4 is a sectional view taken along the line IV-IV in FIG. In FIG. 4, the electrode unit row on the sewage flow outlet side shows the separator, and the electrode unit row on the sewage flow inlet side shows the electrode unit side view. 5 is a cross-sectional view taken along line VV in FIG. 2, FIG. 6 is an enlarged view of a portion VI in FIG. 5, and FIG. 7 is an enlarged view of a sludge discharge port.

First, a schematic configuration of an electrolytic cell for a sewage treatment apparatus according to this embodiment will be described. The container of the electrolytic cell is a box-shaped container having a substantially rectangular planar shape, and includes a tank body 1 having a predetermined depth, an inner lid 3 having a predetermined height, and 2 provided on the inner lid 3. It is composed of two upper lids 4 having a small dimension in the height direction for closing the electrode unit service port 31 at a location. The lower part of the upper lid 4 in the inner lid 3 has an opening 32 for mounting an electrode unit on the bottom surface.
Is formed in the concave portion 33 functioning as a support member.
The longitudinal direction (hereinafter, simply referred to as the longitudinal direction of the electrode plate 51a) of the electrode plate 51a of the electrode unit 51 from each of the recesses 33 is the same direction as the long side of the tank body 1 and the longitudinal direction of the electrode plate 51a. The electrode units 51 are inserted so as to form a row at regular intervals in a direction perpendicular to the direction, and the electrode unit row 5 is formed. Further, a sewage outlet 11 is provided on the upper portion of the short side wall of the tank body 1, and the upper surface of the inner lid 3 near the short side wall facing the side wall on which the sewage outlet 11 is provided. Sewage inlet 3 so that sewage flows into the electrolytic cell below from above.
5 are provided.

Next, each part of the electrolytic cell described above will be described more specifically. The tank body 1 is where the wastewater flows in and metal ions are eluted from the electrode into the wastewater, and is formed to have a height volume necessary for this treatment. And, as described above, a pipe is provided as a sewage outlet 11 at an upper portion of one short side wall forming a short side so as to be led out in the horizontal direction. The sewage outlet 11 is provided with a packing 11a. The lower part of the side wall of the sewage outlet 11 is formed as an inclined surface part 12 which is inclined so that the bottom is located at the center side of the tank body 1. Also,
The side wall facing the inclined surface portion 12 is also provided with the inclined surface portion 12.
The inclined surface portion 13 is formed so as to have a symmetrical shape. These inclined surface portions 12 and 13 are formed near the lower portion of the electrode unit row 5 so as to generate convection of wastewater in the tank. Further, shelves 14, 15 projecting outward are formed on the tops of the inclined surfaces 12, 13, and the lower surfaces of the shelves 14, 15 function as fixing surfaces when the electrolytic cell is installed. The shelf 15 on the sewage inflow side has a larger area than the shelf 14 on the sewage outflow side so as to function as a sewage dispersion surface flowing into the electrolytic cell. Is a space for receiving sewage from a sewage inlet 35 attached to the inner lid 3.

An intermediate portion of the electrode unit row 5 on the bottom surface of the tank body 1 is formed into a smooth chevron 16 having the same inclination angle as the inclined surfaces 12 and 13. The central portion of the space sandwiched between the surface portions 12 and 13 is configured to be the center of the electrode unit row 5, and a sludge discharge port 17 is provided in this portion. The sludge discharge port 17 is closed by a rubber stopper 17a.
7b is packing 1 by bolt 17c and nut 17d.
It is attached via 7e, 17f (see FIG. 7).

Also, ribs 19 for fixing the diffuser tubes are provided at two places (a total of eight places) in each electrode unit row so as to sandwich the sludge discharge port 17 therebetween. This rib 19 is a diffuser 25
Rib 1 so that it is slightly lifted from the bottom
9 is provided with a notch 19a for fitting the diffuser tube at the upper end (see FIG. 7). Further, support legs 22 are formed at four places on the bottom surface of the tank body 1. The electrolytic cell can be placed using the support legs 22.
The upper end edge of the tank body 1 forms a flange portion 23, and a downward rib 24 is formed to improve the strength of the edge portion.

As can be clearly understood from FIG. 4, the inner lid 3 is provided above the electrode unit row 5 to secure a wiring space for the power cable relay terminal box 6 and the power cable 62 of the electrode unit 51. It has the required height, and its upper surface constitutes the upper surface of the electrolytic cell. The lower end of the peripheral edge has a flange portion 34 in contact with the flange portion 23 at the upper end edge of the tank body 1, and further, the bent piece 3 having the tip end of the flange portion 34 bent downward.
4a, and is formed so as to cover the upper end of the tank body 1. The inner lid 3 and the tank main body 1 are fixed to the flange portions 23 and 34 by screws or the like with screws 34b.

Further, a flat portion 30 having a small space slightly depressed from the upper surface is formed above the shelf portion 15 in the inner lid 3, and a sewage inlet 35 is attached to the flat portion 30. The sewage inflow port 35 is provided with a flanged pipe 35a having a mounting flange below, a straight pipe 35b connected to the flanged pipe 35a, and a straight pipe 35.
90 ° elbow 35c rotatably attached to b
A communication pipe 35d for supplying sewage from the previous process is attached to the 90-degree elbow 35c.
In the portion of the sewage inflow port 35, both the inner lid 3 and the tank main body 1 are formed to have a tapered planar shape.

In a portion from the sewage inlet 35 to the side wall facing the sewage inlet 35, a concave portion 33 having a substantially rectangular planar shape having a long side in a direction perpendicular to the long side of the electrolytic cell is provided. Two are formed. The depth is lower than the peripheral edge of the inner lid 3 and slightly higher than the sewage level in the tank body 1. An electrode unit insertion opening 32 is provided on each bottom surface having this depth.

The electrode unit 51 is a set of two rectangular flat plate electrodes made of iron, and these two electrode plates 51a are held at a predetermined interval by an upper holder 51b. . A terminal 51c for connecting a power cable is provided on the upper surface of the holder 51b.
The terminal 51c and the electrode plate 51a are connected in the holder 51b. The electrode unit 51 includes the electrode plate 5
The longitudinal direction of 1a is the longitudinal direction of the electrolytic cell, and the plurality of electrode units 51 are arranged in a direction orthogonal to the longitudinal direction of the electrode plate 51a. Holder 51b
Has a width larger than the width (length in the longitudinal direction) of the electrode plate 51a, and both portions protruding from the electrode plate 51a have
One pin hole 51e is provided for engaging with the pin 36 disposed around the electrode unit insertion opening 32 of the inner lid 3. The lower portion of the pin hole 51e has a large-diameter portion to facilitate insertion of the pin 36, and the upper portion has a small-diameter portion to improve the accuracy of the fixed position. A handle 51d is provided on the upper surface of the holder 51b (see FIGS. 4 to 6).

A separator 52 is provided between the electrode units 51. This separator 52
Is made of plastic which is an insulating material, the size of the flat plate portion 52a is substantially equal to the size of the electrode plate 51a, and the upper portion thereof is formed as a wide support portion 52b like the electrode holder. A hole 52c is provided for engaging the pin 37 disposed around the electrode unit insertion opening of the inner lid 3 or the bolt 38 attached to the inner lid 3, one by one. Has a handle 52
b is provided. The pins 37 and the bolts 38 are alternately arranged. In addition, a sludge discharge port 17 is located below the central separator 52 located above the sludge discharge port 17.
Is connected via a chain 55.

When inserting the separator 52 and the electrode unit 51, first, the separator 52 is
Or, it is inserted while engaging with the bolt 38. Then
The electrode unit 51 is inserted while engaging with the pin 36. At this time, the holder 51b of the electrode unit 51 rides on the support 52b of the separator 52 (FIG. 6).
reference). Next, the fixing plate 53 having a substantially L-shaped cross section is
While holding the holder 51b of the electrode unit 51.
Place on top. 53a is a cushioning / insulating material attached to the fixing plate 53. Then, the service nut 39 is fastened to the bolt 38 and finally fixed. Thereby, the sewage inlet 35 side and the sewage outlet 11 side,
The longitudinal direction of the electrode plate 51a is the longitudinal direction of the electrolytic cell, and the electrode units 51 and the separators 52 are alternately arranged in a direction orthogonal to the longitudinal direction of the electrode plate 51a. The electrode unit rows 5 in which the separators 52 are arranged are formed. The center line of the electrode unit row 5 is connected to the aforementioned sludge discharge port 17.
It is configured to pass through the center.

Further, in the inner lid 3, between the electrode unit row 5 and the sewage outlet 35 and between the electrode unit row 5 and the sewage outlet 11, the inclined surfaces 12, 13 of the tank body 1 are formed. The electrode unit 51 is located at an upper portion, and is located above the electrode unit 51 in this portion.
A relay terminal box 6 for connecting the power supply to a power supply is arranged. Each relay terminal box 6 has a substantially rectangular shape, and has four relay terminals 61 arranged in the longitudinal direction. Two relay terminal boxes 6 are provided so that the longitudinal direction thereof is the row direction of the electrode unit rows 5. Therefore, the arrangement direction of the four relay terminals 61 and the row direction of the electrode unit row 5 match. Note that FIG.
Reference numeral 62 in FIG. 4 denotes a power cable for connecting one electrode unit 51 to one relay terminal 61.
Reference numeral 63 in FIGS. 2 and 3 denotes a power cable for connecting the power supply to each relay terminal box 6.

Below each electrode unit row 5, two air diffusers 25 are arranged as a set of air diffusers (see FIGS. 3 and 4). The distal ends of the two diffuser tubes 25 are connected by a communication tube 28. The air diffuser 25 raises connection pipes 26 and 27 for connecting to an external blower 80 along a long side wall of the electrolytic cell (FIGS. 3 and 5).
(See FIG. 4) and a notch 37 at the upper end of the inner lid 3 (see FIGS. 4 and 5). The riser pipe 26 on the center side is connected to the blower 80, and a blind plug 29 is attached to the tip of the riser pipe 27 on the opposite side of the center. 25 is supplied with air. Further, the air diffusers having the above-described configuration provided corresponding to the two electrode unit rows 5 are connected to separate blowers 80 via communication pipes 81 as shown in FIG.

In the inner cover 3, a concave portion 33 having an electrode unit insertion opening 32 on the bottom surface is covered by the upper cover 4, as shown in FIGS. The upper cover 4 protects a person from being electrically shocked by the terminal 51c of the electrode unit 51 or the like, and is closed during normal use and opened when the electrode unit 51 is replaced.
The upper lid 4 is fixed to the inner lid 3 with screws 41, but two handles 42 are formed on the upper surface of the upper lid 4 to facilitate opening and closing.

Next, at two places where the corners of the two concave portions 33 are adjacent to each other, a flat portion 70 forming a concave portion is formed. A sensor containing a lid switch 71 that is activated by opening and closing the upper lid 4 and a pressure switch 75 that is activated by a change in the discharge side pressure of the blower 80 between the upper lid 4 and one of the flat portions 70. A unit 7 is provided. The sensor unit 7 will be described with reference to FIGS. FIG. 8 is an enlarged view of the sensor unit 7, and FIG. 9 is a control circuit diagram of the electrode unit. FIG. 9 shows one electrode unit row 5
Only shown. However, actually, the other electrode unit row is connected in the same manner, but is not shown for simplification.

As shown in FIG. 8, the lid switch 71 comprises a switch body 72 mounted inside a switch box 79 and a magnet 73 mounted inside the upper lid 4.
When the upper lid 4 is closed, the reed switch in the switch body 72 is turned ON by the action of the magnet 73, and when the upper lid 4 is opened, the magnet 73 acts on the switch body 72. The reed switch in the switch main body 72 is designed to be turned off when the operation is stopped. In addition, two lid switches 71 are provided corresponding to the corners of the two upper lids 4 so as to detect opening and closing of the two upper lids 4 respectively.

On the other hand, the pressure switch 75 is used when the air outlet of the air diffuser 25 is clogged, the pressure on the discharge side of the blower 80 rises abnormally, and air is not supplied to the sewage. In the case where a diaphragm type is used as 80 and the diaphragm constituting the blower 80 is damaged, that is, the pressure on the discharge side of the blower 80 is abnormally low, and air is supplied to the sewage. The case where it is not performed is detected as abnormal pressure. 8, 76 and 77 are blowers 80.
This is a pipe for introducing the pressure on the discharge side to the pressure switch 75. Reference numeral 78 denotes a control circuit electric wire.

As shown in FIG. 9, eight electrode units 51 arranged in one electrode unit row 5 are connected to a power supply 9 through two relay terminal boxes 6 and further through a control panel 8. It is connected. The control panel 8 has two lid switches 71 and two pressure switches 75 turned on,
OFF information has been input. When the opening of the upper lid 4 is detected by one of the lid switches 71, or by the operation of one of the pressure switches 75, the air diffuser 2 is opened.
The power supply line of the electrode unit 51 is turned off when it is detected that air is not normally supplied from the power supply 5.

The electrolytic cell configured as described above is configured as the following system. In the case of wastewater treatment for business use, for example, as shown in FIG. 10, sewage is guided to an electrolytic cell C via an activated sludge tank A and an intermediate flow rate adjusting tank B, A coagulation sedimentation tank D is provided. On the other hand, in the case of a household combined treatment septic tank, Japanese Patent Application Laid-Open Nos. 10-192869 and 10-258283.
And a system as described in JP-A-2000-189977. The operation of the present electrolytic cell when used as a wastewater treatment system for business sites will be described below.

The sewage discharged from the business site is firstly degraded by microorganisms in the activated sludge tank A in a BOD component, and the sewage in the activated sludge tank A is electrolyzed as a fixed amount of sewage through the intermediate flow rate adjustment tank B. It is introduced into the tank C. At this time, the sewage falls from the upper part of the electrolytic cell C onto the shelf 15 of the tank body 1 and is dispersed, and flows almost uniformly to the sewage outlet 11 through between the electrode units 51. In particular, in the present embodiment, the electrode unit rows 5 are arranged in two rows in a direction substantially orthogonal to the flowing direction of the sewage, and the dimension in the width direction of the tank is reduced, so that the sewage stagnates at the width direction end of the tank. Is prevented. Therefore, it is possible to prevent the phosphorus trapping efficiency due to the ions eluted from the electrode unit at the tank end from decreasing and the phosphorus removing efficiency from decreasing.

At this time, divalent iron ions are eluted from the anode of the electrode unit 51 by the electrolytic action of the electrode unit 51, and hydrogen gas is generated from the cathode. On the other hand, the diffuser 25
The divalent iron ions are oxidized to trivalent iron ions by aeration from the air. Further, the concentration of the hydrogen gas is reduced by the air blown out from the air diffuser 25, thereby avoiding the danger of explosion. Trivalent iron ions react with orthophosphoric acid in sewage and are formed into poorly soluble phosphorus compounds. The sludge containing the phosphorus compound is positively floated in the electrolytic cell C by aeration from the diffuser pipe 25, and is discharged from the sewage outlet 11 to the coagulation sedimentation tank D which is the next step. Then, the suspended matter containing the phosphorus compound is precipitated and removed in the flocculation / sedimentation tank D.

At this time, air is blown out from the air diffuser 25 toward the bottom surface of the tank body 1, so that foamy bubbles rise upward, and the slopes provided on the side walls of the tank body 1 on the sewage inflow side and the sewage outflow side. Since the inclined shape of the angled portion 16 at the center of the bottom surface of the tank body 1 which is located between the surface parts 12 and 13 and the electrode unit row 5 is formed near the lower part of the electrode unit row 5, sewage flows around the air diffuser 25. , The wastewater is drawn toward the bottom of the tank body 1, and the sewage effectively causes convection in the electrolytic cell C, so that the suspended matter is smoothly discharged. Further, the longitudinal direction of the electrode plate is the same as the longitudinal direction of the tank, that is, sewage flows along the plate-like surface of the electrode plate, and convection generated in the tank also causes convection in the plate-like surface of the electrode plate. , The convection flow velocity can be increased, and the phosphorus compound can be efficiently suspended. Further, by the action of cleaning the surface of the electrode plate 51a by the convection and the aeration, the sludge is prevented from staying between the electrode plates 51a of the electrode unit 51, and an accident such as a short circuit of the electrodes is avoided.

As described above, since the electrolytic cell C does not accumulate sludge in its own cell, it is usually unnecessary to discharge the sludge in the electrolytic cell C, and when the electrode unit 51 is replaced, It can be done only by doing it together. The replacement of the electrode unit 51 is necessary because the electrode plate 51a is melted and consumed by eluting iron ions from the anode. In the present embodiment, both the anode and the cathode are made of iron, and the polarity is periodically changed in order to avoid depletion of only one electrode. Further, since the separators 52 are arranged between the adjacent electrode units 51, the consumption of each electrode plate 51a is substantially uniform. If the separator 52 is not provided, the electrode plate 51a located in the middle is subjected to electrolytic action on both sides, and is melted at twice the speed of the outermost electrode plate 51a. It becomes impossible to achieve uniform consumption.

In the electrolytic cell C operating as described above,
The time when the electrode plate 51a is worn out is calculated in advance, and the electrode unit 51 is periodically replaced. At this time, the upper lid 4 is first opened. Then, the power cable 62 connected to the relay terminal 61 of the relay terminal box 6 is removed, and the fixing plate 53 having a substantially L-shaped cross section fixing the electrode unit 51 and the separator 52 is removed. In this case, since the relay terminal box 6 and the electrode unit 51 are connected in a substantially adjacent manner, the wiring of the power cable 62 can be neatly arranged, and the work of attaching and detaching the electrode unit 51 can be easily performed. . When the upper cover 4 is opened, the magnet 73 embedded in the upper cover 4 does not act on the switch section in the switch body 72, and the power supply circuits of the two electrode unit rows 5 are turned off. In addition, there is no possibility that the worker is accidentally electrocuted.

When the center separator 52 is removed when the electrode unit 51 is replaced, the lower part of the separator 52 is connected to the rubber plate 17a via the chain 55, so that the rubber stopper 17a is easily pulled out. be able to

In the case where the system of the blower 80 is abnormal due to the above-mentioned reason during the operation of the electrode unit 51 and the aeration is not normally performed, and the operation is continued as it is, Since the electrolysis reaction is continued almost normally, the concentration of hydrogen gas generated from the cathode rises, causing a danger of explosion. Further, convection of sewage in the tank and cleaning of the electrode surface by aeration cannot be performed, so that it becomes difficult to discharge sludge, and the electrode plate 5
Risks such as a short between 1a also occur. However, in the present embodiment, when the abnormality of the air diffuser is detected by the pressure switch 75, the power supply of the electrode unit row 5 is cut off, so that such a danger can be avoided.

As described above, the electrolytic cell of this embodiment is
Relay terminal box 6 is inclined surface 1 of tank body 1
The relay terminal box 6 is disposed so that the relay terminals 61 are arranged in the row direction of the electrode unit row 5, and each electrode unit 51 is connected to a power supply via these relay terminals 61. Therefore, the power cable 62 of each electrode unit 51 is shortened, and the operation can be performed orderly. In particular, since the number of the relay terminals 61 of the relay terminal box 6 is adjusted to the number of the electrode units and one electrode unit 51a is connected to one relay terminal 61, the power cable 62 of the electrode unit 51 is connected to a nearby relay. It can be connected to the terminal 61. For this reason, attachment and detachment of the power cable 62 of the electrode unit 51 become easy. In addition, the inclined surface portions 12, 1, 1
3 can be effectively used, and the device itself can be compactly assembled.

In this embodiment, the inclined surfaces 12 and 13 have a function of causing convection in the sewage. However, the inclined surfaces 12 and 13 may be inclined surfaces for collecting sludge at the bottom. The row 5 may be one row, and the inclined surface portion may be formed only on one side wall. Although the relay terminal box 6 has two electrode unit rows 5 each having four relay terminals for one row, the division into appropriate sizes facilitates handling. In this embodiment, the electrode unit 5
1 and the relay terminal 61 are connected by the power cable 62, but the present invention is not limited to this. That is, the power supply cable 62 may not be used and the two may be directly connected by a connector or the like.

[0043]

As described above, the present invention has the following advantages. According to the first aspect of the present invention, a tank provided for sewage treatment and having a sloped surface portion below at least one side wall, and a pair of electrodes facing each other are provided, and a plurality of electrodes are provided in the tank. An electrode unit, an air diffuser disposed below the sewage level in the tank, a relay terminal to which each of the electrode units is electrically connected, and a power supply for supplying a current to the electrode unit via the relay terminal Since the relay terminal is disposed above the sewage surface in the upper part of the inclined surface part, the upper part of the inclined part can be effectively used to make the electrolytic cell compact. In addition, the power supply cable can be shortened, congestion of the wiring can be avoided, and the attachment / detachment of the electrode unit becomes easy.

According to the second aspect of the present invention, in addition to the above configuration, the inclined surface portion is formed near the electrode. In addition to the above effects, convection of sewage occurs in the tank, and The compound generated by reacting with the eluted ions can be efficiently suspended by the convection and discharged out of the electrolytic cell. Further, the relay terminal and the inclined surface portion are arranged near the electrode unit, so that the electrolytic cell can be formed more compactly.

According to the third aspect of the present invention, a sewage inlet provided on one side of the tank and into which sewage flows is provided, and a sewage outlet provided on the other side of the tank and from which sewage flows out. An electrode unit having a pair of electrodes facing each other, a plurality of electrode units disposed in the tank in two rows in a direction substantially perpendicular to the flow direction of the sewage, and a dispersion unit disposed below the surface of the sewage in the tank. A trachea, a relay terminal to which the electrode unit is electrically connected, and a power supply for supplying a current to the electrode unit via the relay terminal, the vicinity of the electrode in the electrode unit row on the sewage inflow side and the An inclined surface portion is formed below the tank near the electrode of the electrode unit row on the sewage outlet side, and the relay terminal is disposed at a position above the sewage surface above each inclined surface portion. Effect of sewage by rising air bubbles There is enhanced by the inclined surface portion, comprising the sludge from the sewage outlet easily discharged in a bath of the next step. Further, since the direction of the convection and the flow direction of the sewage flowing from the sewage inlet to the sewage outlet are in the same direction, the floating phosphorus compound can be more efficiently discharged from the electrolytic cell. Further, since each electrode unit and the relay terminal are close to each other, wiring work is improved. Further, since the electrode units are arranged in two rows to reduce the size in the width direction of the tank, it is possible to prevent stagnation of sewage at the widthwise end of the tank.
Therefore, it is possible to prevent the phosphorus trapping efficiency by the electrode unit at the tank end from being lowered, and the phosphorus removal efficiency from being lowered.

According to the fourth aspect of the present invention, the longitudinal direction in the planar shape of the electrode and the side wall on which the inclined surface portion is formed are arranged so as to be substantially orthogonal to each other.
The convection of the sewage generated by the interaction between the air diffuser and the inclined surface is not blocked by the electrodes. Therefore, the phosphorus compound can be suspended and efficiently discharged from the electrolytic cell.

According to the fifth aspect of the invention, since one electrode unit is connected to one relay terminal, a plurality of power cables are not connected to the same relay terminal. Therefore, it is safe and the wiring can be further simplified.

According to the sixth aspect of the present invention, a plurality of relay terminal boxes are provided at a position above the sewage surface above the inclined surface, and the plurality of relay terminals are provided in the relay terminal box. Therefore, the size of the relay terminal box can be configured as a size that is easy to handle.

According to the seventh aspect of the present invention, the air diffuser is disposed substantially parallel to the side wall on which the inclined surface is formed and at the bottom of the tank near the inclined surface. The convection flow velocity of the sewage generated in the tank can be increased by the air diffuser and the inclined surface portion, and the floating phosphorus compound can be efficiently discharged from the electrolytic tank.

[Brief description of the drawings]

FIG. 1 is an external plan view of an electrolytic cell according to an embodiment of the present invention.

FIG. 2 is a plan view in a state where an upper lid of the electrolytic cell according to the embodiment of the present invention is removed.

FIG. 3 is a plan view in a state where an upper lid and an electrode unit according to the embodiment of the present invention are removed.

FIG. 4 is a sectional view taken along line IV-IV in FIG. 1, in which the electrode unit row on the sewage outlet side shows a separator, and the electrode unit row on the sewage inlet side shows the side of the electrode unit. .

FIG. 5 is a sectional view taken along line VV in FIG. 2;

FIG. 6 is an enlarged view of a portion VI in FIG. 5;

FIG. 7 is an enlarged view of a sludge discharge port portion of the electrolytic cell according to the embodiment of the present invention.

FIG. 8 is an enlarged view of a sensor unit of the electrolytic cell according to the embodiment of the present invention.

FIG. 9 is a control circuit diagram of the electrode unit of the electrolytic cell according to the embodiment of the present invention.

FIG. 10 is an example of a system in the case where the electrolytic cell according to the embodiment of the present invention is applied to the treatment of business wastewater.

[Explanation of symbols]

Reference Signs List 1 tank main body, 3 inner lid, 4 upper lid, 5 electrode unit row, 6 relay terminal box, 11 sewage outlet, 12, 13 inclined surface, 25 diffuser pipe, 35 sewage inlet, 51 electrode unit, 51a electrode plate, 61 Relay terminal, 62, 63 Power cable.

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Akihiro Fukumoto 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Toshiki Okumi 2-chome Keihanhondori, Moriguchi-shi, Osaka No.5-5 Sanyo Electric Co., Ltd. F-term (reference) 4D061 DA08 DB19 DC13 EA06 EB01 EB20 EB27 EB28 ED06

Claims (7)

[Claims] 1. A tank provided for sewage treatment and having an inclined surface below at least one side wall, an electrode unit having a pair of electrodes facing each other, and a plurality of electrode units disposed in the tank. A diffuser tube disposed below the surface of sewage in the tank, a relay terminal to which each of the electrode units is electrically connected, and a power supply that supplies current to the electrode unit via the relay terminal, An electrolyzer for a sewage treatment device, wherein the relay terminal is disposed above a sewage surface in an upper portion of the inclined surface portion. 2. A tank provided for sewage treatment, the tank having an inclined surface portion below at least one side wall, and a pair of electrodes facing each other, and a plurality of electrode units disposed in the tank. A diffuser tube disposed below the surface of sewage in the tank, a relay terminal to which each of the electrode units is electrically connected, and a power supply that supplies current to the electrode unit via the relay terminal, An electrolytic cell for a sewage treatment device, wherein the inclined surface is formed near the electrode, and the relay terminal is disposed above a sewage surface in an upper portion of the inclined surface. 3. A sewage inflow port provided on one side of the tank and through which sewage flows, a sewage outlet provided on the other side of the tub and outflow of sewage, and a pair of electrodes facing each other, In the tank, a plurality of electrode units arranged in two rows in a direction substantially perpendicular to the flow direction of the sewage, an air diffuser arranged below the surface of the sewage in the tank, and the electrode unit is electrically connected. And a power supply for supplying a current to each of the electrode units via the relay terminal, the vicinity of the electrodes in the electrode unit row on the sewage inlet side and the electrode unit row on the sewage outlet side. An inclined surface portion is formed below the tank near the electrode, and the relay terminal is disposed above the sewage surface in an upper portion of each inclined surface portion. 4. The electrode unit according to claim 1, wherein the electrode unit is disposed such that a longitudinal direction in a planar shape of the electrode and a side wall on which the inclined surface is formed are substantially orthogonal. The electrolytic tank for a sewage treatment apparatus according to any one of claims 1 to 7. 5. The electrolytic tank for a sewage treatment apparatus according to claim 1, wherein one electrode unit is connected to one relay terminal. 6. A plurality of relay terminal boxes are disposed at a position above a sewage surface in an upper portion of the inclined surface portion, and the plurality of relay terminals are disposed in the relay terminal box. The electrolytic tank for a sewage treatment apparatus according to any one of claims 1 to 3. 7. The air diffusion tube according to claim 1, wherein the air diffuser is disposed substantially parallel to a side wall on which the inclined surface is formed and at a tank bottom near the inclined surface. An electrolytic cell for a sewage treatment apparatus according to the above.