JP2001179260A - Water treatment apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water treatment apparatus capable of effectively utilizing the almost all over electrodes to perform electrolysis. SOLUTION: A dephosphorizing treatment apparatus P is equipped with an electrolytic cell 30, two sets of rectanglar plate-shaped iron electrodes 31, 32 arranged in the electric cell 30 and a DC power supply for supplying an electrolytic current across the electrodes 31, 32. An electrode holder 33 is provided by one at every one set of the electrodes 31, 32 and the upper parts of one set of the electrodes are inserted in the lower part of the electrode holder 33 formed into a cavity shape through a spacer 45 to form a watertight hollow part 40 in the electrode holder 33.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a water treatment apparatus,
More specifically, the present invention relates to a water treatment apparatus incorporated in a septic tank for treating human wastewater or domestic wastewater or a water tank for breeding organisms, and for removing phosphoric acid from water to be treated.

[0002]

2. Description of the Related Art Conventionally, this type of water treatment apparatus includes at least one set of iron electrodes which are suspended in a septic tank or the like and which elute iron ions for removing phosphoric acid in water by electrolysis. And a power supply for supplying an electrolytic current to these electrodes.

[0003]

In such a water treatment apparatus, these electrodes are arranged so that the lower part is submerged and the upper part is raised from the water surface in consideration of insulation properties and maintainability. Have been.

[0004] For this reason, there has been a problem that a portion of the electrode that protrudes upward from the water surface cannot be effectively used for electrolysis.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a water treatment apparatus capable of effectively utilizing substantially the entirety of an electrode for electrolysis. .

[0006]

According to the present invention, there is provided an electrolytic cell containing water to be treated, a terminal arranged in a suspended manner in the electrolytic cell, a terminal portion, and a phosphoric acid component in the water. At least one set of electrodes for eluting iron or aluminum ions by electrolysis for removal, an electrode holder for holding these electrodes, a DC power supply for supplying an electrolytic current to the electrodes, A power supply and a lead wire for electrically connecting the terminal portion of the electrode are provided, and a watertight hollow portion is provided in the electrode holder, and the terminal portion of the electrode is arranged in this hollow portion, A water treatment apparatus is provided, wherein the electrodes are all submerged in the water of the electrolytic cell.

[0007] The electrolysis tank contains human wastewater or domestic wastewater to be treated or water from a biological breeding aquarium, and is a separate tank incorporated in a part of a septic tank or a water tank. It may be a tank-like portion provided in advance as a part of a septic tank, a water tank, or the like.

[0008] At least one set of electrodes is formed in a desired form such as a plate or a rod, and is suspended from the electrolytic cell. These electrodes have, for example, a terminal portion for electrical connection at the upper end or the like, and elute iron or aluminum ions for removing phosphoric acid in water by electrolysis.

[0009] The set of electrodes may, for example, both comprise iron or aluminum electrodes, or one comprises iron or aluminum electrodes and the other comprises insoluble metal electrodes. In the former case, by inverting the polarity of the electrode as desired, it is possible to prevent the formation of an iron oxide layer on the electrode surface, which may obstruct ion elution from the electrode. In the latter case, an iron electrode or an aluminum electrode is used as an anode, and an insoluble metal electrode is used as a cathode. Examples of the insoluble metal electrode include an electrode made of silver, platinum, or the like.

The iron or aluminum ions eluted from the iron or aluminum electrode into the electrolytic cell are
Reacts with phosphoric acid (orthophosphoric acid) in water to form a poorly soluble phosphorus compound (Fe (OH) _x (PO ₄ ) _y or Al (O
H) _x (PO ₄ ) _y ) and aggregate and precipitate.

The electrode is provided with a terminal portion which is electrically connected to a DC power supply for electrolysis via a lead wire.

One electrode holder is provided for each set of electrodes, or one for each set of electrodes, and holds the electrodes at predetermined intervals at a predetermined length in a suspended manner. A handle may be provided on the electrode holder for convenience such as inspection and replacement of the electrode.

The electrode holder is provided with a hollow portion that becomes watertight. In order to provide this hollow part, for example, the upper part of a set of electrodes is pressed into the lower part of the electrode holder formed in a hollow shape, or the bonding part between the electrode holder and the electrode is bonded with an adhesive, There is a method of interposing a packing at the joint or using these together. The terminal portion of the electrode is arranged in this hollow portion. As a result, the terminal portions of the electrodes are kept watertight.

In the water treatment apparatus according to the present invention, the electrodes are all immersed in the water in the electrolytic cell during use.
Even if the electrodes are all immersed in the water of the electrolytic cell, the terminal parts of the electrodes arranged in the hollow part of the electrode holder are kept watertight, so it is necessary to consider the insulation and maintenance of the electrodes, etc. And the electrolysis can be carried out by effectively utilizing almost the entirety of the electrode.

It is preferable that the water treatment apparatus according to the present invention further includes an air diffuser for diffusing water in the electrolytic cell, and a blower for supplying air or oxygen to the air diffuser. In the case of such a configuration, the electrode surface is washed by the diffusion of water, so that passivation of the electrode can be effectively prevented.

In the water treatment apparatus according to the present invention, each set of electrodes and electrode holders is configured such that a part of the air diffused by the air diffuser passes from below to above between the electrodes of each set, It is preferable that a part of the water flow generated by the above is circulated between the inside and outside of each set of electrodes. In the case of such a configuration, a part of the water flow generated by the air diffuser passing from below to above between each pair of electrodes circulates between the inside and outside of each pair of electrodes, The cleaning of the electrode surface is further promoted, the flow velocity between the electrodes can be secured, and more efficient phosphorus removal can be performed.

In the water treatment apparatus according to the present invention, it is preferable that the electrode holder is attached to a substantially central portion of the electrodes while being sandwiched between the electrodes of each set. In the case of such a configuration, the electrode holder and the electrode can be arranged in deeper water by elongating the lead wire, and more efficient phosphorus removal can be performed. The whole electrode can be used.

The water treatment apparatus according to the present invention further includes a lead wire arranging member connected to the electrode holder so as to extend upward, and a water-tight hollow portion communicating with the hollow portion of the electrode holder. It is preferable that a part or most of the lead wire connected to the terminal part of the electrode in the hollow part of the electrode holder is disposed in the hollow part. In such a configuration, the connection portion between the terminal portion of the electrode and the lead wire is kept water-tight, so that this connection portion can be arranged in water, and the electrode holder and the electrode are connected to each other. It can be placed in deeper water, and more efficient phosphorus removal can be performed.

In the water treatment apparatus according to the present invention, it is preferable that a connection member for electrically connecting and disconnecting the lead wire and the power source is provided outside the electrolytic cell. In such a configuration, inspection and replacement of the electrode can be easily performed by attaching and detaching the connection member.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Four embodiments of the present invention will be described below with reference to the accompanying drawings, together with modifications thereof. The present invention is not limited by these.

Embodiment 1 As shown in FIGS. 1 and 2, a dephosphorization treatment apparatus P as a water treatment apparatus according to Embodiment 1 of the present invention includes an inflow pipe 30a into which water to be treated flows and a treatment pipe 30a. An electrolytic cell 30 having a discharge pipe 30b for discharging the water from the outside to the outside, and two rectangular plate-shaped iron electrodes 31 and 32 arranged in the electrolytic cell 30
And two electrode holders 33 for holding the electrodes 31 and 32, and a DC power supply for supplying an electrolytic current between the electrodes 31 and 32.

Each of the electrode holders 33 is plate-shaped, slightly wider than the electrodes 31 and 32, and
A lower portion into which the upper edge portion of the lower portion is fitted, a middle portion having a narrow width extending vertically upward from the center of the upper edge portion, and an upper portion having the same width as the lower portion extending from the middle portion to the upper edge. The upper part extends to. Electrode 3 has electrodes 3
A diffuser tube 35 for diffusing water from below 1.32
And a blower 36 outside the tank for supplying air to the air diffuser 35.
And are arranged.

Also, as shown in FIGS.
The electrode unit 37 is formed by 32 and the electrode holder 33. That is, the electrode holder 33 is provided with a pair of electrodes 3.
One is provided for each 1.32. Then, the upper portions of the pair of electrodes 31 and 32 are press-fitted into the lower portion of the hollow electrode holder 33 via the spacer 45,
A watertight hollow portion 40 is formed in the electrode holder 33.

At the upper ends of the electrodes 31 and 32, an electrode holder 3 is provided.
3. Lead wires 41 and 42 passed through the hollow portion 40 from the upper part of 3.
Terminal portion 43 electrically connected to a DC power supply for electrolysis through
・ 44 are provided. The lead wires 41 and 42 and the terminal portions 43 and 44 are connected by soldering. Further, the electrode holder 33 is provided with a handle 33a for convenience such as inspection and replacement of the electrodes 31 and 32.

Further, as shown in FIGS. 1 and 2, FIG.
Of the electrode unit 37 at a predetermined position, that is, the electrode 31
32 are immersed in the water of the electrolytic cell 30, and a plate-shaped unit disposing member 38 for arranging the water surface of the electrolytic cell 30 at a position in the middle of the electrode holder 33 is provided on the upper edge of the electrolytic cell 30. Installed. A connection member 46 for connecting the lead wires 41 and 42 and a power supply so as to be electrically connectable and detachable is provided on the outside of the electrolytic cell 30-on the unit arrangement body 38-.

As shown in FIGS. 6 and 7, the dephosphorization treatment device P is incorporated in a small-sized combined treatment / purification tank D. The septic tank D is provided with a plurality of water purifying tanks from the side of the inflow pipe 2 into which mixed water of human wastewater and domestic wastewater flows to the side of the discharge pipe 3 for discharging treated water to the outside in accordance with the order of the water purification process. A septic tank main body 1 in which a tank is formed is provided.

Reference numeral 4 denotes a first anaerobic filter tank formed at the forefront of the inflow pipe 2 side. The first anaerobic filter bed tank 4 is provided with an anaerobic filter bed 5 which is a filter bed for anaerobic microorganisms.
Anaerobic treatment is performed by inhabiting microorganisms in the anaerobic filter bed 5. The anaerobic filter bed 5 suppresses the load of the next tank by preventing the sediment from being lifted up by the water flow when the inflow water or backwash wastewater temporarily flows in and becoming a suspended substance and flowing out to the next tank. Can be lowered.

Reference numeral 6 denotes a second anaerobic filter bed tank formed next to the first anaerobic filter tank 4. In the second anaerobic filter bed tank 6, anaerobic microorganisms are made to inhabit the anaerobic filter bed 7 to perform anaerobic treatment.

Reference numeral 8 denotes a next biofilm filtration tank which is formed adjacent to the second anaerobic filter bed tank 6. The biofilm filtration tank 8 is provided with an aerobic filter bed 9 which is a filter bed for aerobic microorganisms. The aerobic microorganisms inhabit the aerobic filter bed 9 to perform aerobic treatment. ing.

Reference numeral 10 denotes a next treated water tank formed adjacent to the biofilm filtration tank 8. In the treated water tank 10, the treated water that has been subjected to aerobic treatment in the biofilm filtration tank 8 and that has been filtered and advected is stored.

Reference numeral 11 denotes a disinfecting tank formed above the treated water tank 10. This disinfection tank 11 is usually
The supernatant water after the treatment is sterilized and discharged from the discharge pipe 3 to the outside.

The first anaerobic filter bed tank 4 and the second anaerobic filter bed tank 6 are separated by a vertical partition wall 12. At the upper part of the partition wall 12, an advection port 13 penetrating the partition wall 12 is formed. A rectangular or cylindrical advection tube 14 is fitted in the advection port 13.

The second anaerobic filter bed tank 6 and the next biofilm filtration tank 8 are separated by an intermediate partition wall 15. An upflow passage 16 is fixedly provided on the second anaerobic filter bed tank 6 side of the intermediate partition wall 15. The water that has flowed from the first anaerobic filter bed tank 4 to the second anaerobic filter bed tank 6 through the convection tube 14 passes through the anaerobic filter bed 7 in a downward flow, and then rises through the upflow passage 16.

In the anaerobic filter bed 7 in the second anaerobic filter bed tank 6,
Some suspended solids (SS) are captured. The trapped SS is gradually anaerobically decomposed and becomes soluble, or is stored as sludge at the bottom of the second anaerobic filter bed tank 6. In the anaerobic filter bed 7, organic nitrogen is anaerobically decomposed into ammonia nitrogen.

Near the bottom of the biofilm filtration tank 8,
2 are arranged in a horizontal state. The air diffuser tube 22 is connected to a blower 40, and performs an oxygen supply function for aerobic microorganisms living in the aerobic filter bed 9 of the biofilm filtration tank 8 by blowing out the air supplied by the blower 40.

A filter medium is disposed on the aerobic filter bed 9 in the biofilm filtration tank 8, and microorganisms adhering to the filter medium are subjected to BO
The D component and the like are decomposed or made into SS, and captured in the filter medium. The biofilm filtration tank 8 also has a physical filtration action,
Here, SS is also captured. In the biofilm filtration tank 8,
The action of nitric acid bacteria and nitrites that convert nitrogen to nitric acid converts ammoniacal nitrogen to nitrate nitrogen.

A partition 23 is provided between the biofilm filtration tank 8 and the next treatment water tank 10. And this partition 23
The biofilm filtration tank 8 and the treated water tank 10 communicate with each other at the bottom.

A circulation path 26 is provided from the upper portion of the biofilm filtration tank 8 to the upper portion of the first anaerobic filter bed tank 4 for constantly returning the supernatant water of the treated water in the treated water tank 10. An air lift pump 27 is connected to an end of the circulation path 26 above the biofilm filtration tank 8. The air lift pump 27 is connected to an air lift pipe 28 that pumps up the processing water in the processing water tank 10.

An end of the circulation path 26 above the first anaerobic filter tank 4 is formed as an inlet 29 to the first anaerobic filter tank 4. The phosphorus removing device P is connected to the circulation path 26 above the second anaerobic filter bed tank 6 in the circulation path 26.

In the dephosphorization treatment apparatus P, when electrolysis is started, iron ions Fe ²⁺ are eluted from the electrodes 31 and 32 in the electrolytic cell 30, and oxygen is supplied into the treated water by the air diffuser 35. . Fe ²⁺ is oxidized by dissolved oxygen to form Fe ³⁺ , and reacts with orthophosphoric acid PO ₄ ^{3- in} water to form a hardly soluble iron phosphate Fe (OH) _x (PO ₄ ) _y . And this iron phosphate salt Fe (OH) _x (PO ₄ )
_{The y} is agglomerated with the SS component existing in the water as a nucleus, and forms a large floc. Part of the floc floats in the water and another part precipitates and deposits on the bottom of the electrolytic cell 30.

Each set of electrodes 31 and 32 and electrode holder 3
3 indicates that a part of the air diffused by the air diffuser 35 is the electrode 31 of each set.
It is configured so as to pass from below to above between the electrodes 32, and to circulate a part of the water flow generated by the air diffusion between the inside and outside of the electrodes 31 and 32 through the middle part of the electrode holder 33. . Therefore, a part of the water flow generated by the aeration that passes upward from below between the electrodes 31 and 32 of each pair circulates between the inside and outside of the electrodes 31 and 32 of each pair.・
32 is further promoted, and the electrode 3
The flow rate between 1 and 32 can be ensured, and more efficient phosphorus removal can be performed.

Embodiment 2 As shown in FIG. 8 and FIG. 9, a dephosphorization treatment device Q as a water treatment device according to Embodiment 2 of the present invention is a water storage device for storing water in a water tank 50 for breeding organisms. Storage tank (electrolysis tank) 51
And two round bar-shaped iron electrodes 52 and 53 arranged in the water storage tank 51 and all submerged in water;
An electrode holder 55 for holding 53 and 54 and a DC power supply for supplying a current for electrolysis between the electrodes 52 and 53 are provided.

As shown in FIGS. 10 to 12, the electrodes 52 and 53 and the electrode holder 55 form an electrode unit 58. That is, one electrode holder 55 is provided for each pair of electrodes 52 and 53. Electrode holder 5
5 includes two circular through-holes 55a and a circular recess 5 formed below each of the through-holes 55a.
5b and 55b are provided.

Then, the recesses 55b.5 of the electrode holder 55
The upper portions of the pair of electrodes 52, 53 connected to the lead wires 54, 54 with the terminal portions 52a, 53a are press-fitted into the electrode holder 55, so that the electrode holder 55 has a water-tight hollow portion (through hole) 55a.
55a is formed, and this hollow portion (through hole) 55a
55a is sealed with an adhesive.

As shown in FIGS. 8 and 9, a flat unit arrangement body 59 for arranging the electrode unit 58 at a predetermined position is attached to the upper edge of the water storage tank 51.

8 and 9, reference numeral 60 denotes a water storage tank 5.
1, a filtration tank 61 provided downstream of the filtration tank 60; a return pipe 62 provided through the inner lid 63 downstream of the decolorization tank 61; Represents an outer lid covered on the edge of the end wall of the inner lid 63.

The water tank 50 is formed of a box having a substantially rectangular planar shape. The water in the water tank 50 is pumped by the circulation pump 65 from the strainer 66 to the water storage tank 51 via the suction pipe 67.

In the water storage tank 51, phosphoric acid in water is removed. That is, iron ions Fe ²⁺ for removing phosphoric acid in water are eluted from the iron electrodes 52 and 53 by the electrolysis. Further, oxygen is supplied from the air diffuser 56 into the water.

Fe ²⁺ is oxidized by dissolved oxygen to form Fe ³⁺ and reacts with orthophosphoric acid PO ₄ ^{3- in} water to form a colored hardly soluble iron phosphate Fe (OH) _x (PO ₄ )
becomes _y . And this iron phosphate salt Fe (OH) _x (PO
₄ ) _y aggregates with the nucleus of the SS component present in the water to form large flocs, some of which float in the water and the other settle and deposit on the bottom of the water storage tank 51.

The filtration tank 60 is for removing iron phosphate Fe (OH) _x (PO ₄ ) _y floating in water and organic matter such as fish manure and residual food, and has a built-in filter. ing.

The decolorization tank 61 introduces water that has passed through the filter of the filtration tank 60 from the bottom advancing port 60a to decolorize the colored iron phosphate Fe (OH) _x (PO ₄ ) _y floating in the water. It is for filtering and has a built-in filter.

The return pipe 62 is supplied with water that has been purified by passing through the decolorizing tank 61 and overflowed from the upper edge advection port 61a.
It is for returning to.

In FIG. 8, reference numeral 68 denotes a gravel layer disposed at the bottom of the water tank 50. In FIG. 9, reference numeral 69 denotes a control unit. The control unit 69 controls the electrolysis in the water storage tank 51 together with the drive control of the blower 57 and the circulation pump 65.

Embodiment 3 As shown in FIGS. 13 and 14, Embodiment 3 of the present invention
The dephosphorization treatment device R as a water treatment device according to the above forms a part of the small-sized combined treatment / purification tank E. The septic tank E is provided with a septic tank main body 101 in which a plurality of tanks are formed in sections from the inflow pipe 102 to the discharge pipe 103 in accordance with the order of the water purification process.

The first anaerobic filter bed tank 104 has an anaerobic filter bed 105.
The anaerobic filter bed 105 is provided with anaerobic microorganisms to perform anaerobic treatment.
In the second anaerobic filter bed tank 106, anaerobic microorganisms are made to inhabit the anaerobic filter bed 107 to perform anaerobic treatment.

An aerobic filter bed 109 is provided in the biofilm filtration tank 108, and aerobic treatment is performed by inhabiting aerobic microorganisms in the aerobic filter bed 109.

In the treatment water tank 110, the biofilm filtration tank 108
The treated water that has been subjected to aerobic treatment in, filtered and advected is stored still.

Usually, the disinfection tank 111 is adapted to disinfect the supernatant water after being treated in the treatment water tank 110 and discharge it from the discharge pipe 103 to the outside.

Anaerobic filter bed 1 in second anaerobic filter bed tank 106
At 07, some suspended solids (SS) are captured. The trapped SS is gradually anaerobically decomposed and becomes soluble, or is stored as sludge at the bottom of the second anaerobic filter tank 106. In the anaerobic filter bed 107, organic nitrogen is anaerobically decomposed into ammonia nitrogen.

In the vicinity of the bottom of the biofilm filtration tank 108, an air diffuser 122 is disposed horizontally. This diffuser tube 122
Is connected to the blower 140, and blows out the air supplied by the blower 140, so that the biofilm filtration tank 10
8 to supply oxygen to aerobic microorganisms living in the aerobic filter bed 109.

A circulation path 126 is provided from the upper part of the biofilm filtration tank 108 to the upper part of the first anaerobic filter bed tank 104 for constantly returning the supernatant water of the treated water in the treated water tank 110.

The biofilm filtration tank 108 has a pair of square plate-shaped iron electrodes 71 and 72 from the upper wall 130 of the septic tank E.
Are arranged in a hanging manner. The biofilm filtration tank 108 also functions as an electrolytic tank in the phosphorus removal treatment device R.

As shown in FIG. 15 and FIG.
The electrodes 71 and 72 are held by an electrode holder 74 attached to the approximate center of the electrodes 71 and 72 with screw members 73 and 73.

The electrode holder 74 has a hollow portion 74a. A hollow lead wire disposing member 75 is connected to the electrode holder 74 so as to extend upward from the electrode holder 74. The connection between the electrode holder 74 and the member 75 is
The lower end of the member 75 is inserted into a circular hole in the upper part of the electrode holder 74 and joined by an adhesive.

As shown in FIG. 15 and FIG.
Terminal portions 76 and 77 are provided at the center of the inside of 72. The terminal portions 76 and 77 are electrically connected to the DC power supply for electrolysis from outside the member 75 through two lead wires 78 and 79 passed through the hollow portion 75a and the hollow portion 74a of the electrode holder 74. I have. Lead wires 78 and 79 and terminal part 7
6.77 are connected by soldering.

Reference numeral 80 in FIG. 17 denotes an annular packing interposed on the joint surface between the electrodes 71 and 72 and the electrode holder 74 (there are two, but only one is shown). These packings 80 are closely fitted into annular grooves 74b (two are provided but only one is shown) provided on the outer surfaces of both side walls of the electrode holder 74, and the electrode holder 74 and the electrodes 71 and 72 are screwed. By being integrated by 73, 73, 73, 73, the lead wire arranging through holes 74 c provided on both side walls of the electrode holder 74 are sealed. Thus, the hollow portion 74a of the electrode holder 74 and the hollow portion 75a of the member 75 are watertight.

The lead wires 78 and 79 are connected to two hollow portions 74.
a and 75a, and is connected to a connecting member 81 attached to a vertical surface of a part 130 of the upper wall of the septic tank E, as shown in FIGS. The connection member 81 connects the lead wires 78 and 79 and a power supply so as to be electrically connectable and detachable.

When the electrolysis is started in the dephosphorization treatment apparatus R, the biofilm filtration tank 108 also serving as an electrolysis tank is used to remove iron from the iron electrodes 71 and 72 from the iron electrodes 71 and 72 by electrolysis. The ions Fe ²⁺ elute.

The electrodes 71 and 72 and the electrode holder 7
4 is a part of the air diffused by the air diffuser 122
It is configured such that the water flows from the lower part to the upper part, and a part of the water flow generated by the aeration circulates between the inside and the outside of the electrodes 71 and 72.
Therefore, a part of the water flow generated by the diffused air passing from below to above between the electrodes 71 and 72 is partially changed.
Since circulation is performed between the inside and the outside of the electrodes 72, cleaning of the surfaces of the electrodes 71 and 72 is further promoted.
The flow velocity between the electrodes 71 and 72 can be ensured, and more efficient phosphorus removal can be performed.

Fourth Embodiment As shown in FIGS. 20 to 22, a dephosphorization treatment device S as a water treatment device according to a fourth embodiment of the present invention is a water storage device for storing water in a water tank 50 for breeding organisms. Storage tank (electrolysis tank) 51
A pair of iron electrodes 71 and 72 disposed in the water storage tank 51 and all submerged in water;
And a DC power supply for supplying a current for electrolysis between the electrodes 71 and 72.

The electrodes 71 and 72 and the electrode holder 74
A flat unit arrangement body 59 for arranging the electrode unit composed of at a predetermined position is attached to the upper edge of the water storage tank 51.

Reference numeral 56 denotes an air diffuser, 57 denotes a blower, 60 denotes a filtration tank, 61 denotes a decolorization tank, 62 denotes a return pipe, 63 denotes an inner lid, 64 denotes an outer lid, 65 denotes a circulation pump, 66 denotes a strainer, and 67 denotes a pumping pipe. , 69 represent a control unit.

The water tank 50, the water storage tank 51, and the diffuser 56-
The control unit 69 is the same as those in the phosphorus removal treatment device Q according to the second embodiment. The electrodes 71 and 72 and the electrode holder 74 are the same as those in the dephosphorization apparatus R according to the third embodiment.

The electrode holder 74 has a hollow lead wire extending upward from the electrode holder 74, passing through the central through hole 59 a of the unit arrangement body 59, and partially mounted on the unit arrangement body 59. The arrangement member 75 is connected. The connection between the electrode holder 74 and the member 75 is the same as that of the dephosphorization apparatus R.

In the water storage tank 51, phosphoric acid in the water is removed. That is, iron ions Fe ²⁺ for removing phosphoric acid in water are eluted from the iron electrodes 52 and 53 by the electrolysis.

The electrodes 71 and 72 and the electrode holder 7
4, a part of the air diffused by the air diffuser 56 passes upward from below between the electrodes 71 and 72, and a part of the water flow generated by the air diffuser is formed between the inside and the outside of the electrodes 71 and 72. It is configured to circulate through. Therefore, a part of the water flow generated by the air diffuser passing from below to above between the electrodes 71 and 72 is partially changed by the electrodes 71 and 7.
The electrode 7 circulates between the inside and outside of each other.
The cleaning of the surfaces 1 and 72 is further promoted, the flow rate between the electrodes 71 and 72 can be secured, and more efficient phosphorus removal can be performed.

[0077]

According to the water treatment apparatus of the first aspect,
An electrolytic cell containing water to be treated and disposed in a suspended manner in the electrolytic cell, having a terminal portion, and eluting iron ions or aluminum ions for removing phosphoric acid in water by electrolysis. At least one set of electrodes, an electrode holder for holding these electrodes, a DC power supply for supplying an electric current for electrolysis to the electrodes, and a power supply for electrically connecting the power supply and terminal portions of the electrodes. The electrode holder is provided with a watertight hollow portion, and the terminal portion of the electrode is disposed in the hollow portion, and the electrode is entirely submerged in the water of the electrolytic cell. Therefore, even if the electrodes are all submerged in the water of the electrolytic cell, the terminal parts of the electrodes arranged in the hollow part of the electrode holder are kept watertight, so that the insulation and maintenance of the electrodes are taken into account. Therefore, the electrolysis can be performed by effectively using almost the entire electrode.

The water treatment apparatus according to claim 2 further includes a diffuser for diffusing water in the electrolytic cell, and a blower for supplying air or oxygen to the diffuser. . Therefore, in addition to the effect of the water treatment device according to the first aspect, the electrode surface is washed by the water aeration, so that passivation of the electrode can be effectively prevented.

In the water treatment apparatus according to the third aspect of the present invention, each set of electrodes and the electrode holder is configured so that a part of the air diffused by the air diffuser passes between the electrodes of each set from below to above. A part of the water flow generated by the diffusion is circulated between the inside and outside of each set of electrodes. Therefore, in addition to the effect provided by the water treatment apparatus according to claim 2, a part of the water flow generated by the aeration that passes upward from below between the electrodes of each set is part of the inside of the electrodes of each set. Since the ink is circulated to the outside, the cleaning of the electrode surface is further promoted, the flow velocity between the electrodes can be secured, and more efficient phosphorus removal can be performed.

In the water treatment apparatus according to the fourth aspect, the electrode holder is attached to substantially the center of these electrodes while being sandwiched between the electrodes of each set. Therefore, in addition to the effect provided by the water treatment apparatus according to any one of claims 1 to 3, the electrode holder and the electrode can be arranged in deeper water by elongating the lead wire. In addition, more efficient phosphorus removal can be performed, and the entire electrode can be used.

According to a fifth aspect of the present invention, the water treatment apparatus further comprises a lead wire arranging member connected to the electrode holder so as to extend upward, and this member communicates with the hollow portion of the electrode holder. A watertight hollow portion is provided, and a part or most of a lead wire connected to a terminal portion of the electrode in the hollow portion of the electrode holder is provided in the hollow portion. Therefore, in addition to the effect provided by the water treatment apparatus according to any one of claims 1 to 4, the connection point between the terminal portion of the electrode and the lead wire is kept watertight, and this connection point is It is possible to dispose in water, the electrode holder and the electrode can be disposed in deeper water, and more efficient phosphorus removal can be performed.

In the water treatment apparatus according to the sixth aspect, a connecting member for electrically connecting and disconnecting the lead wire and the power source is provided outside the electrolytic cell. Therefore,
In addition to the effects provided by the water treatment apparatus according to any one of claims 1 to 5, inspection and replacement of the electrode can be easily performed by attaching and detaching the connection member.

[Brief description of the drawings]

FIG. 1 is a vertical longitudinal sectional view of a water treatment apparatus according to Embodiment 1 of the present invention.

FIG. 2 is a plan view of the water treatment apparatus of FIG.

FIG. 3 is a front view of an electrode unit constituting the water treatment apparatus of FIG.

FIG. 4 is a plan view of the electrode unit of FIG. 3;

FIG. 5 is a side view of the electrode unit of FIG. 3;

FIG. 6 is a front sectional view of a small-sized combined treatment septic tank in which the water treatment apparatus of FIG. 1 is incorporated.

FIG. 7 is a plan view of the combined treatment septic tank of FIG. 6;

FIG. 8 is a front sectional view of a water tank for breeding a creature in which a water treatment device according to Embodiment 2 of the present invention is incorporated.

FIG. 9 is a plan view of the water tank of FIG.

FIG. 10 is a plan view of an electrode unit constituting the water treatment apparatus of FIG.

FIG. 11 is a front sectional view of the electrode unit of FIG. 8;

FIG. 12 is a bottom view of the electrode unit of FIG. 8;

FIG. 13 is a front sectional view of a small-sized combined treatment septic tank including a water treatment apparatus according to Embodiment 3 of the present invention.

FIG. 14 is a plan view of the merged treatment septic tank of FIG.

FIG. 15 is a side view of an electrode and an electrode holder constituting the water treatment apparatus of FIG.

FIG. 16 is a front view of the electrode and the electrode holder of FIG.

17 is a side sectional view for explaining a method of assembling the electrode and the electrode holder of FIG.

18 is a front view showing a state in which the electrode and the electrode holder of FIG. 15 are connected to a connection member by a lead wire arranging member.

FIG. 19 is a side view showing a state in which the electrode and the electrode holder of FIG. 15 are connected to a connecting member by a lead wire arranging member.

FIG. 20 is a front cross-sectional view of a water tank for breeding organisms in which a water treatment device according to Embodiment 4 of the present invention is incorporated.

FIG. 21 is a plan view of the water tank of FIG. 20.

FIG. 22 is an enlarged front sectional view of a main part of the water tank of FIG. 20;

[Explanation of symbols]

 D Septic tank P Dephosphorization treatment device 30 Electrolysis tank 31 Iron electrode 32 Iron electrode 33 Electrode holder 35 Aeration tube 36 Blower 37 Electrode unit 38 Unit arrangement 40 Hollow part 41 Lead wire 42 Lead wire 43 Terminal part 44 Terminal part Q Dephosphorization Treatment device 50 Water tank 51 Water storage tank 52 Iron electrode 53 Iron electrode 54 Lead wire 55 Electrode holder 55a Hollow part 56 Aeration tube 57 Blower 58 Electrode unit 59 Unit arrangement E Purifier tank 71 Iron electrode 72 Iron electrode 74 Electrode holder 74a Hollow Part 75 Lead wire arranging member 75a Hollow part 78 Lead wire 79 Lead wire 81 Connection member 108 Biofilm filtration tank S Dephosphorization treatment device

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4D038 AA05 AA08 AB44 AB46 AB47 BA02 BA04 BB10 BB18 BB19 4D061 DA06 DA08 DB11 DB18 EA06 EA07 EB27 EB28 EB30 EB33 ED06 FA15 4K021 AB21 BA02 CA02 CA15 DA09 DC15

Claims (6)

[Claims] An electrolytic cell in which water to be treated is stored, and an iron ion or aluminum ion for suspending the electrolytic cell and having a terminal portion for removing a phosphoric acid content in the water. At least one set of electrodes eluted by electrolysis, an electrode holder for holding these electrodes, a DC power supply for supplying an electric current for electrolysis to the electrodes, and a terminal for the power supply and the electrodes are electrically connected. The electrode holder has a water-tight hollow portion, and the electrode terminal is disposed in the hollow portion, and the electrode is completely submerged in the water of the electrolytic cell. A water treatment apparatus, characterized in that: 2. The water treatment apparatus according to claim 1, further comprising an air diffuser for diffusing water in the electrolytic cell, and a blower for supplying air or oxygen to the air diffuser. 3. An electrode and an electrode holder of each set include a part of air diffused by an air diffuser which passes from below to an upper part of each set of electrodes and a part of a water flow generated by the air diffuser. The water treatment apparatus according to claim 2, wherein the water treatment device is configured to circulate between the inside and outside of each set of electrodes. 4. The water treatment according to claim 1, wherein the electrode holder is attached to a substantially central portion of the electrodes while being sandwiched between the electrodes of each set. apparatus. 5. A lead wire arranging member connected to the electrode holder so as to extend upward, wherein the member is provided with a watertight hollow portion communicating with the hollow portion of the electrode holder. The water treatment apparatus according to any one of claims 1 to 4, wherein a part or most of a lead wire connected to a terminal portion of the electrode is provided in a hollow portion of the electrode holder. 6. The battery according to claim 1, wherein a connecting member for electrically connecting and disconnecting the lead wire and the power supply is detachably provided outside the electrolytic cell. A water treatment apparatus as described in the above.