JP6001295B2 - Water treatment equipment - Google Patents

Description

  The present invention relates to a water treatment apparatus that performs electrolytic treatment of water using a metal electrode.

  Japanese Patent Laid-Open No. 2000-15266 discloses an example of a sewage treatment apparatus that performs electrolytic treatment of water using a metal electrode. In this sewage treatment apparatus, an iron electrode configured to elute iron ions for removing phosphoric acid in sewage by electrolysis is used as a metal electrode.

JP 2000-15266 A

  By the way, in this kind of water treatment apparatus, there is a concern that the electrolytic treatment performance may be deteriorated due to interference of solids or the like with the metal electrode immersed in the electrolytic cell. For example, the electrolytic sludge generated by the electrolytic treatment with the metal electrode accumulates in the electrolytic tank, or the floating sludge generated by the water treatment other than the electrolytic treatment flows into and stays in the electrolytic tank. The problem that the original electrolytic treatment performance by the electrode cannot be obtained is assumed. Therefore, when designing this type of water treatment apparatus, there is a demand for a technique for preventing deterioration of electrolytic treatment performance by the metal electrode by suppressing the influence of solid matter such as sludge to interfere with the metal electrode as much as possible.

  Therefore, the present invention has been made in view of the above points, and provides a technique effective in preventing degradation of electrolytic treatment performance due to metal electrodes in a water treatment apparatus that performs electrolytic treatment using metal electrodes. This is the issue.

  In order to solve the above problems, the present invention according to the claims is configured.

  A water treatment apparatus according to the present invention is configured to include a treatment tank body, a plurality of water treatment areas, a solid-liquid separation treatment area, an aerobic treatment area, an electrolytic cell, a metal electrode, a control device, a suppression mechanism, and a circulation path. The Here, the processing tank main body is configured as a main body portion of a processing tank having an accommodation space, and typically, the processing tank main body is configured in a tank shape by abutting the upper tank and the lower tank formed in a half-cracked shape. The The plurality of water treatment regions are configured as regions that are respectively disposed in the accommodation space so as to perform predetermined water treatment of the water to be treated. The “treated water” or “water” here includes all or part of the raw water flowing into the treatment tank body, and the water after flowing into the treatment tank body is also relative. For example, all or part of the water that moves between the primary treatment tank (front tank) located on the upstream side and the secondary treatment tank (rear tank) located on the relatively downstream side by, for example, extrusion flow or circulation flow Is included. The solid-liquid separation treatment region is configured as a region for subjecting the water to be treated to solid-liquid separation treatment or anaerobic treatment among the plurality of water treatment regions. The aerobic treatment region is configured as a region for aerobic treatment of water after the solid-liquid separation treatment in the solid-liquid separation treatment region among the plurality of water treatment regions. The electrolytic cell is configured as a cell disposed in the solid-liquid separation processing region. A metal electrode is comprised as an electrode for electrolytic treatment immersed in the water in an electrolytic vessel for electrolytic treatment. The inflow port is configured as an opening portion for allowing water before electrolytic treatment to flow into the electrolytic cell, and the outflow port is configured as an opening portion for allowing water after electrolytic treatment to flow out from the electrolytic cell. The control device is configured as a device for controlling power feeding to the metal electrode.

  The suppression mechanism prevents electrolytic sludge generated by electrolytic treatment with metal electrodes from accumulating at the bottom of the electrolytic cell and prevents floating sludge from the solid-liquid separation area from flowing into the electrolytic cell. By doing so, it is configured as a mechanism that suppresses the performance degradation of the electrolytic treatment. Thereby, it becomes possible to prevent the degradation of the electrolytic treatment performance due to the metal electrode by suppressing the influence of solid matter such as sludge interfering with the metal electrode through the suppression mechanism. In addition, by installing an electrolytic cell in the solid-liquid separation processing region, which is a region different from the aerobic processing region, when the air diffusion tube is installed in the aerobic processing region, the air diffusion tube is subjected to electrolytic processing. It is possible to suppress clogging with the generated metal such as iron.

The circulation path is a circulation path for circulating a part of the water after the aerobic treatment in the aerobic treatment region to the solid-liquid separation treatment region. An electrolytic cell is provided on this circulation path. Water that circulates in the circulation path is aerobically treated in the aerobic treatment region, then flows into the electrolytic cell through the inflow port, is electrolyzed using a metal electrode, and then enters the solid-liquid separation treatment region through the outflow port. And leaked. Thereby, the electrolytic sludge generated in the electrolytic cell can be quickly discharged to the solid-liquid separation processing region and stored in the solid-liquid separation processing region. Moreover, treatment Riso by varying the water level in the body, is that provided the structure of the order to increase the circulation amount of water circulating in the circulation path. By providing a structure for increasing the amount of circulating water, it becomes easier to discharge the electrolytic sludge from the electrolytic cell to the solid-liquid separation region. The “water after being subjected to aerobic treatment in the aerobic treatment region” may be directly circulated from the aerobic treatment region, or may be downstream from the aerobic treatment region. The form circulated from the other water treatment area | region where the water aerobically treated in the air treatment area | region flows in may be sufficient.

  In the water treatment apparatus of the further form concerning this invention, it is preferable that both the inflow port and outflow port of an electrolytic cell are connected to the solid-liquid separation process area | region. In this configuration, the water that has flowed into the electrolytic cell through the inlet from the solid-liquid separation region is subjected to electrolytic treatment using the metal electrode, and then flows out again to the solid-liquid separation region through the outlet. In addition, the inflow port and the outflow port of an electrolytic cell may each be comprised as an independent opening part, or may be comprised as a common opening part. Thereby, it becomes possible to perform electrolytic treatment of the water in the solid-liquid separation treatment region continuously with the electrolytic cell.

  In the water treatment apparatus of the further form concerning this invention, it is preferable that a suppression mechanism contains a closing part and a discharge part. The closing portion functions to close the bottom of the electrolytic cell so as to prevent the floating sludge in the solid-liquid separation treatment region from flowing into the electrolytic cell. The discharge unit is configured to discharge the electrolytic sludge generated in the electrolytic cell to the outside of the electrolytic cell by a water flow toward the outlet. In this case, the water flow toward the outlet may be formed by air diffused air or may be formed by an air lift type air lift pump. Further, the water flow from the inflow port to the outflow port may be constant or variable. Thereby, in particular, by setting the flow rate of the water flow toward the outlet to be higher than a predetermined flow rate at which an upward flow can be imparted to the electrolytic sludge, the electrolytic sludge is solid-liquid through the outlet. It can be discharged to the separation processing area.

  In the water treatment apparatus of the further form concerning this invention, it is preferable that a suppression mechanism contains a hopper part, a bottom part opening, and a shielding part. The hopper is configured as a sludge collecting mechanism formed on the bottom of the tank so as to collect the electrolytic sludge generated in the electrolytic tank to the bottom of the tank. The bottom opening is configured as an opening portion provided in the hopper so that the inside and outside of the electrolytic cell are always communicated with each other at the bottom of the bath. The shielding part is configured as a shielding part arranged so as to shield the bottom opening only when the electrolytic cell is viewed from below the tank without closing the bottom opening. That is, the shielding part is arranged so that the bottom opening cannot be visually recognized when the electrolytic cell is viewed from below the cell. As a result, the electrolytic sludge collected through the hopper can be discharged through the bottom opening to prevent the electrolytic sludge from accumulating in the electrolytic tank, while the floating sludge in the solid-liquid separation treatment area is moved into the electrolytic tank. Can be prevented by the shielding part.

  In a further embodiment of the water treatment apparatus according to the present invention, the hopper portion has a first inclined surface extending in a predetermined direction, a first inclined surface extending in a direction crossing the predetermined direction and a bottom opening. And a second inclined surface spaced from the surface. In this case, the shielding part has a tip part of the first inclined surface so that the bottom part opening is shielded only when the electrolytic cell is viewed from below the tank without the tip part of the second inclined surface closing the bottom part opening. Rather than extending downward from the tank. Thus, the inclined surface, which is a constituent element of the hopper, is rational because it functions as both a collecting function for electrolytic sludge and a shielding function for opening the bottom.

  In the water treatment apparatus of the further form concerning this invention, it is preferable that a suppression mechanism contains an aeration mechanism. This air diffusion mechanism fulfills the function of generating a water flow toward the outlet by the air flow of the air diffused upward supplied from the air diffuser provided at the bottom of the electrolytic cell. Thereby, the electrolytic sludge generated in the electrolytic cell can be more reliably discharged out of the electrolytic cell by using the air diffusion mechanism. In addition, it is reasonable that the air diffuser can be used as a supply source for supplying dissolved oxygen for metal ion oxidation during the electrolytic treatment.

  In the water treatment apparatus of the further form concerning this invention, it is preferable that a suppression mechanism contains an air lift mechanism. This air lift mechanism fulfills a function of generating a water flow toward the outlet by an air lift type air lift pump provided in the electrolytic cell. Thereby, the electrolytic sludge generated in the electrolytic cell can be more reliably discharged out of the electrolytic cell using the air lift mechanism.

  In a further form of the water treatment apparatus according to the present invention, the solid-liquid separation treatment region in which the electrolytic cell is disposed is subjected to the solid-liquid separation treatment of the water to be treated by the principle of sedimentation separation without interposing a filter bed filled with the filter medium. It is preferable to be configured as a region for performing the above. In such a solid-liquid separation treatment area, no filter bed or air piping is provided, so that it is easy to secure an installation space for an electrolytic cell, and a visual field is also easily secured, so that it is possible to easily perform replacement work of metal electrodes and the like. it can.

  As described above, according to the present invention, it is possible to prevent a decrease in electrolytic treatment performance in a water treatment apparatus that performs electrolytic treatment using a metal electrode.

It is a figure which shows schematic structure of the water treatment apparatus 100 concerning this invention. It is a perspective view of the electrode apparatus 123 of the electrolytic cell 120 in FIG. It is an enlarged view of the electrolytic cell 120 in FIG. It is a figure which shows the electrolytic cell 220 of another embodiment. It is a figure which shows the electrolytic cell 320 of another embodiment. It is the figure which looked at the electrolytic cell 320 in FIG. 5 from the tank downward (arrow A direction). It is a figure which shows schematic structure of the water treatment apparatus 200 of another embodiment. It is an enlarged view of the electrolytic cell 520 in FIG. It is a figure which shows the electrolytic cell 620 of another embodiment. It is a figure which shows the example of a change of the tank main body. It is a figure which shows the example of a change of the tank main body. It is a figure which shows the example of a change of the tank main body. It is a figure which shows the example of a change of the tank main body.

  Hereinafter, the configuration of a water treatment apparatus according to an embodiment of the present invention will be described with reference to the drawings. Note that this embodiment describes a water treatment apparatus that receives and treats raw water (also referred to as “drainage” or “treated water”) discharged from ordinary households, apartment houses, etc., into a water treatment area. .

  A schematic configuration of a water treatment apparatus 100 according to the present invention is shown in FIG. As shown in FIG. 1, the water treatment apparatus 100 of the present embodiment has a treatment tank body 101 as a casing of the water treatment apparatus 100. The water treatment apparatus 100 is a water treatment apparatus that treats domestic wastewater (living sewage) together with manure, and is also referred to as a “septic tank” or a “merged treatment septic tank”.

  The processing tank main body 101 is typically configured in a tank shape by abutting an upper tank and a lower tank, both of which are formed in a half-crack shape, and the processing tank main body 101 has a hollow accommodating space 101a. Is formed. The accommodation space 101a is provided with a water treatment unit 101b (also referred to as “water treatment mechanism”) described later. The treatment tank main body 101 and the accommodation space 101a here correspond to the “treatment tank main body” and the “accommodation space” in the present invention, respectively.

  The processing tank main body 101 includes an inflow pipe 102, an outflow pipe 103, and a manhole portion 104. The inflow pipe 102 is configured as an opening for introducing raw water before treatment into the internal space of the treatment tank main body 101. The outflow pipe 103 is configured as an opening for the treated water to be led out from the internal space of the treatment tank main body 101. The manhole portion 104 is configured as a portion in which manholes for tank entry, internal inspection, and cleaning for the treatment tank body 101 are formed.

  In addition, in this specification, among the treatment tank main body 101 and each water treatment element, the manhole part 104 side is prescribed | regulated as a tank upper part or a tank upper part, and the other side is prescribed | regulated as a tank lower part, a tank lower part, or a tank bottom part. Further, the inflow pipe 102 side of the processing tank body 101 is defined as the upstream side, and the outflow pipe 103 side is defined as the downstream side. In addition, a direction (typically, a direction orthogonal) intersecting the horizontal direction along the extending surface of the manhole portion 104 is defined as a vertical direction (also referred to as “tank up / down direction”). In FIG. 1, a line indicated by “WL” indicates a normal water level line of water stored in the processing tank main body 101, and a line indicated by “HWL” is stored in the processing tank main body 101. The upper reference water level line is shown. Further, the “treated water” or “water” in this specification includes all or part of the raw water flowing into the processing tank main body 101, and after flowing into the processing tank main body 101. As for water, all or part of the water moving by, for example, extrusion flow or circulation flow is included between the primary treatment tank positioned relatively upstream and the secondary treatment tank positioned relatively downstream. Is done.

  The water treatment unit 101b is configured to include primary treatment tanks 110 and 130, secondary treatment tanks 140 and 150, and a disinfection tank 170 as a plurality of water treatment regions. In this water treatment apparatus 100, the water to be treated that has flowed into the treatment tank main body 101 through the inflow pipe 102 is first subjected to primary water treatment in the primary treatment tanks 110 and 130, and then the secondary treatment tanks 140 and 150. Then, secondary water treatment is performed, and further post-treatment is performed in the disinfection tank 170, and finally the treated water flows out of the treatment tank body 101 through the outflow pipe 103. The above processing is continuously performed through a path from the inflow pipe 102 to the outflow pipe 103. In this case, the water treatment apparatus 100 may be a septic tank configured to discharge the water that has flowed out of the treatment tank body 101 as it is, or the water that has flowed out of the treatment tank body 101 may be used as a toilet or A water reuse device configured to be reused as water for watering may be used. The primary treatment tanks 110 and 130, the secondary treatment tanks 140 and 150, and the disinfection tank 170 referred to here constitute “a plurality of water treatment regions” in the present invention.

  The primary treatment tanks 110 and 130 are configured by one or a plurality of treatment tanks (treatment areas) for separating and removing contaminants such as sludge and solid matter in the water to be treated. In the embodiment shown in FIG. 1, the primary treatment tank 110 includes a partition member that partitions the inside of the tank, a so-called baffle plate 111, and is configured as a contaminant removal tank that separates and removes contaminants via the baffle plate 111. ing. On the other hand, the primary treatment tank 130 is configured as an anaerobic filter bed tank having a filter bed 131 filled with a filter medium C1 to which anaerobic microorganisms adhere.

  The contaminant removal tank 110 is configured as a region for performing solid-liquid separation treatment of water to be treated by the principle of sedimentation separation without interposing a filter bed filled with a filter medium. The water after the contaminant removal is performed in the contaminant removal tank 110 is removed by the principle of the extrusion flow through the advection opening 112 provided in the partition wall standing between the anaerobic filter floor tank 130 and the water. It is comprised so that it may flow from the tank 110 to the anaerobic filter bed tank 130. FIG. In the anaerobic filter bed tank 130, when the water to be treated passes through the filter medium C1 of the filter bed 131, the solid matter is separated and the organic pollutants are anaerobically decomposed and removed by the action of the anaerobic microorganisms. Reductive denitrification of nitrogen is performed. The “solid-liquid separation treatment region” in the present invention is configured by the contaminant removal tank 110 and the anaerobic filter bed tank 130 described here. In addition, as needed, a solid-liquid separation process area | region can also be comprised by only one of the contaminant removal tank 110 and the anaerobic filter bed tank 130. FIG.

  In the contaminant removal tank 110 having the above-described configuration, an electrolytic tank 120 is disposed on the top of the tank. In the present embodiment, the electrolytic bath 120 is configured to include a bath main body 121, an electrode device 123, and an air diffuser 128. The tank body 121 includes an inflow port 121a and an outflow port 121b that are provided independently to communicate between the inside and the outside of the tank. The inlet 121a is configured as an opening for allowing water before electrolytic treatment to flow into the tank body 121, and the outlet 121b is configured as an opening for allowing water after electrolytic treatment to flow out of the tank main body 121. ing. The electrolytic bath 120 (the bath body 121), the inlet 121a, and the outlet 121b referred to here correspond to one embodiment of the “electrolytic bath”, “inlet”, and “outlet” in the present invention, respectively.

  An inflow port 121 a of the tank body 121 is connected to a pump discharge part 162 of a circulation pump 160 described later, and an outflow port 121 b of the tank body 121 is disposed in the upper part of the contaminant removal tank 110. Accordingly, the water discharged from the circulation pump 160 flows into the tank main body 121 through the inflow port 121a, while the water in the tank main body 121 flows out to the contaminant removal tank 110 through the outflow port 121b. Has been. In the present embodiment, in particular, the inlet 121a and the outlet 121b are both installed in the upper part of the tank body 121, and a predetermined residence time of water in the tank body 121 is secured. Moreover, in order to prevent the water in the tank main body 121 from flowing back to the circulation pump 160, it is desirable that the inlet 121a is set at a position higher than the outlet 121b.

  The hollow space in the tank body 121 is provided as a storage space for storing water, and as an immersion space for immersing a pair of metal electrodes 125, 125, which will be described later, of the electrode device 123 in the water. It is configured as an installation space. Therefore, although the details will be described later as an action by the electrolytic treatment, in the electrolytic bath 120, the water stored in the bath is electrolytically treated by the electrode device 123, while the electrolytic sludge generated by the electrolytic treatment is diffused by the air diffuser 128. The function of discharging to the outside of the tank using the aeration action from This air diffuser 128 is also configured as means for supplying oxygen for oxidizing metal ions during the electrolytic treatment.

  In addition, one long supporting leg 122 is connected to the bottom of the outer surface of the tank body 121. Thereby, the tank main body 121 is fixed to the processing tank main body 101 by being immersed in the water in the foreign substance removal tank 110 to a substantially central position in the vertical direction of the tank while being supported from below via the support legs 122. . According to such a configuration, the water level difference between the inside and outside of the tank main body 121 can be suppressed, so that the water pressure acting on the tank main body 121 can be suppressed, and thereby the plate thickness of the tank main body 121 can be reduced. Become. As a means for arranging the tank body 121 at the position, instead of or in addition to the structure of supporting the tank body 121 from below, the tank body 121 is attached to a bracket or the like provided on the processing tank body 101 side. A structure for fixing directly can be adopted. Further, the baffle plate 111 fixed to the processing tank main body 101 can be used to fix the tank main body 121 to the baffle plate 111. Moreover, the tank main body 121 can also be arrange | positioned above the water surface of the contaminant removal tank 110 so that the said tank main body 121 may not be immersed in the water in the contaminant removal tank 110 as needed. Furthermore, the baffle plate 111 and the tank main body 121 can be integrally molded.

  The secondary treatment tanks 140 and 150 are configured by one or a plurality of treatment tanks (treatment regions) for performing an aerobic treatment of the water to be treated. In the embodiment shown in FIG. 1, the secondary treatment tank 140 is configured as a contact filter bed tank having a filter bed 141 filled with a filter medium C2 to which aerobic microorganisms adhere. On the other hand, the secondary treatment tank 150 is configured as a treated water tank that performs a function of temporarily storing the water flowing in from the contact filter bed tank 140.

  The contact filter bed 140 is configured such that water after being treated in the anaerobic filter bed tank 130 is transferred through the transfer opening 132 according to the principle of extrusion flow. In this contact filter bed tank 140, the water to be treated comes into contact with the filter medium C2 of the filter bed 141 in a diffused state of the air from the diffuser pipe 142 arranged at the bottom of the tank, and organic pollutant substances due to the action of aerobic microorganisms. While decomposition and removal are performed, removal of suspended solids (SS) and nitrification of ammonia nitrogen are performed. Typically, it is preferable that the filter medium C2 has a configuration in which a plate-like contact material is disposed at an upper part that first contacts the water to be treated, and a net-like roll-shaped filter medium is filled at a lower part of the contact material. In addition, although not particularly illustrated, it is preferable that the filter beds 141 are respectively disposed on both the left and right sides intersecting with the longitudinal direction of the treatment tank body 101 with the treatment water tank 150 interposed therebetween. The water treated in the contact filter bed tank 140 passes through the treated water tank 150 and then moves to the disinfection tank 170. The contact filter bed tank 140 and the treated water tank 150 here constitute an “aerobic treatment region” in the present invention.

  A circulating pump 160 is installed in the treated water tank 150 having the above configuration. In the circulation pump 160, the pump suction port 161 is disposed at the bottom of the treated water tank 150, and the pump discharge port 162 is connected to the inlet 121 a of the electrolytic tank 120. Accordingly, a part of the water at the bottom of the treated water tank 150 is circulated to the contaminant removal tank 110 through a circulation path formed by the circulation pump 160 and the electrolytic tank 120. By the way, in this Embodiment, the water level in the processing tank main body 101 can change between the normal reference water level line WL and the upper reference water level line HWL, for example, by a discharge pump 172 of the disinfection tank 170 described later. ing. In such a configuration, when the water level in the treatment tank body 101 rises from the normal reference water level line WL to the upper reference water level line HWL, the circulation pump 160 is contaminated from the treatment water tank 150 by reducing the head. The circulation amount of the water circulated to the material removal tank 110 is increased.

  As a result, the water circulating in this circulation path flows into the electrolytic cell 120 from the treated water tank 150 through the inlet 121a of the electrolytic cell 120, and is subjected to electrolytic treatment through the metal electrodes 125 and 125, and then It will flow out to the contaminant removal tank 110 through the outflow port 121b. This circulation path is for circulating a part of the water after being aerobically treated in the contact filter bed tank 140 constituting the aerobic treatment area to the contaminant removal tank 110 constituting the solid-liquid separation treatment area. This is a route and corresponds to the “circulation route” in the present invention. Typically, the circulation pump 160 is preferably configured as a so-called air lift type air lift pump that operates when air is supplied into the pump body through an air supply pipe 163 as shown in FIG. The nitrate nitrogen contained in the circulating water is denitrified in the treatment process of the contaminant removal tank 110 and the anaerobic filter bed tank 130, and is released outside the tank as nitrogen gas. The amount of circulating water is preferably about 3 to 6 times the daily average amount of sewage.

  The disinfecting tank 170 includes a medicine cylinder 171 and a discharge pump 172 filled with a solid disinfectant for performing disinfection processing. The water transferred from the treatment water tank 150 by the discharge pump 172 is finally discharged out of the treatment tank body 101 through the outflow pipe 103 while being disinfected by the disinfectant eluted from the drug cylinder 171 in the disinfection tank 170. . The discharge pump 172 is configured as an air lift type air lift pump provided with an air supply pipe (not shown). By supplying air through the air supply pipe, the water in the treated water tank 150 sucked from the suction port 173 is used. Is discharged from the discharge port 174. The disinfection tank 170 is provided with an overflow weir 175 that constitutes an overflow structure. The upper edge portion of the overflow weir 175 defines the upper reference water level line HWL of the water in the treatment tank main body 101. When the amount of raw water inflow increases and the water level of the treatment water tank 150 rises, the overflow weir 175 The water that has flowed over the upper edge is discharged through the disinfection tank 170 and the outflow pipe 103. In connection with this configuration, another tank, such as a discharge pump tank in which a discharge pump is installed, may be provided downstream of the disinfection tank 170. Moreover, since the water level of the tank upstream from the disinfection tank can be changed between WL and HWL by the discharge pump 172, the head of the circulation pump 160 is reduced when the water level rises due to the inflow of raw water, and the amount of circulating water is increased. be able to.

  Here, for a detailed structure of the electrode device 123 having the above configuration, reference is made to FIG. 2 as a perspective view of the electrode device 123. As shown in FIG. 2, the electrode device 123 controls an electrode holding portion 124 (cell base), a pair of metal electrodes 125 and 125 attached and fixed to the electrode holding portion 124, and power feeding to the metal electrode. It is comprised so that the control apparatus 127 for may be included. The metal electrodes 125 and 125 and the control device 127 here correspond to the “metal electrode” and the “control device” in the present invention, respectively.

  The electrode holding unit 124 has a function of holding (supporting) the upper portions of the pair of metal electrodes 125 and 125. The electrode holding portion 124 is further sealed to seal a holding portion main body 124a having a handle 124c that can be gripped by an operator's fingers, and terminals (not shown) built in the holding portion main body 124a. A lid 124b and the like are used. Both the holding portion main body 124a and the sealing lid 124b are made of an electrically insulating material such as a synthetic resin material, for example, a vinyl chloride resin, and are configured so as to cut off an electric leakage to the handle 124c.

  A support member 121c that supports the electrode device 123 from below is attached to the upper part of the electrolytic cell 120. Specifically, the support member 121c has an insertion hole (for example, the insertion holes 121d and 121d in FIG. 2) into which the pair of metal electrodes 125 and 125 are inserted individually or collectively. The electrode holding part 124 is supported from below with the pair of metal electrodes 125 inserted in the insertion hole. Thereby, when performing various inspections (periodic inspections, etc.) regarding the electrode device 123, the operator can easily perform operations for detaching and attaching the electrode device 123 from the support member by grasping the handle 124c of the electrode holding portion 124 by hand. It can be carried out.

  Each metal electrode 125 is formed in a substantially quadrangular (substantially rectangular) flat plate shape in a side view, and one end (base end) in the long side direction is fixed to the electrode holder 124 side by a fixing means such as a fixing bolt. . The pair of metal electrodes 125 and 125 are arranged substantially parallel to each other in the fixed state, and the distance between one metal electrode 125 and the other metal electrode 125, that is, the inter-electrode distance d (electrode spacing) is both. It is comprised so that it may become substantially constant regarding the extending direction of an electrode. Each metal electrode 125 is typically configured as an iron electrode made of a metal material containing iron. Each of the pair of metal electrodes 125 and 125 fulfills a function as an electrode for electrolytic treatment that performs electrolytic treatment of water by being immersed in the water in the tank body 121 of the electrolytic tank 120.

  Note that the number, shape, size, material, and the like of the pair of metal electrodes 125, 125 can be variously changed according to the amount and properties of the water to be treated. For example, a plurality of pairs of metal electrodes 125, 125 can be installed as necessary. Each metal electrode 125 is typically made of a metal material containing iron, but as another example, the metal electrode can be made of a metal material containing another material such as aluminum. .

  During the operation of the electrolytic cell 120 having the above configuration, the control device 127 supplies power (energization) to the metal electrodes of the electrode device 123 (the pair of metal electrodes 125 and 125 in FIG. 2) through the connection cable 126. The connection cable 126 is configured by connecting a plurality of cables (in this embodiment, a cable extending from the control device 127 and a cable extending from the electrode device 123) by a relay box 126a made of a waterproof container. A direct current is supplied to the metal electrode, and the magnitude of the current can be adjusted according to the inflow amount of phosphorus. At this time, when each metal electrode 125 is an iron electrode, an anode and a cathode are formed by the metal electrode, and divalent iron ions (Fe2 +) are eluted as metal ions from the metal electrode 125 on the anode side into the water. . That is, each metal electrode 125 serves as a supply source for supplying iron ions into the water to be treated. Although not particularly illustrated, the control device 127 is provided with a polarity inversion circuit, and the polarity inversion circuit can switch the polarity of the pair of metal electrodes 125 and 125 every predetermined time (for example, every 24 hours). ing. Thereby, each metal electrode 125 can be an anode or a cathode. By reversing the polarity, it can be prevented that it elutes from one of the two iron electrodes. The divalent iron ions (Fe2 +) eluted from the anode are oxidized by dissolved oxygen in the water to become trivalent iron ions (Fe3 +), and the trivalent iron ions (Fe3 +) circulate containing phosphate ions. It reacts with phosphate ions (PO43−) in water to produce iron phosphate (FePO4 or the like) that becomes a metal phosphate that is hardly soluble in water. The dissolved oxygen in the water used for this reaction is mainly caused by oxygen supplied by the diffuser pipe 128 and dissolved oxygen in the water transferred from the treated water tank 150 by the circulation pump 160. In this way, the water containing the phosphorus component is subjected to electrolytic treatment using the metal electrodes 125, 125 of the electrode device 123, so that the phosphorus component in the water is a metal phosphate (hereinafter referred to as "electrolytic sludge") that is hardly soluble in water. And also deposited). Hydrogen is generated from the cathode, which cleans the electrode surface and prevents the formation of a nonconductor on the electrode surface.

  By the way, in the water treatment apparatus 100 of the said structure, the electrolytic sludge produced | generated especially by the electrolysis process in the electrolysis tank 120 accumulated in the electrolysis tank 120, or produced in the contaminant removal tank 110 in which the electrolysis tank 120 is installed. When floating sludge (also referred to as “scum”) flows into and stays in the electrolytic bath 120, solid matter such as sludge interferes with the metal electrodes 125 and 125, and the original electrolysis by the metal electrode is performed. A problem that processing performance cannot be obtained is assumed. Therefore, when designing this type of water treatment apparatus, there is a demand for a technique for preventing deterioration of electrolytic treatment performance by minimizing the influence of solid matter such as sludge.

  As a result of considering the above points, the present inventors have developed a technique for constructing a water treatment apparatus that is effective in suppressing a reduction in electrolytic treatment performance in an electrolytic cell, such as the electrolytic cell 120 described above. That is, according to this technique, in the case of the present embodiment, at least the function of preventing the electrolytic sludge generated by the electrolytic treatment in the electrolytic bath 120 from accumulating in the electrolytic bath 120 and the floating sludge are provided. Both functions of preventing the flow into the electrolytic cell 120 are realized. The function will be described in detail below.

  According to the enlarged view of the electrolytic cell 120 in FIG. 1 shown in FIG. 3 (for convenience, the interior of the cell is shown in a transparent state), the tank body 121 of the electrolytic cell 120 is formed in a bottomed cylindrical shape. That is, only the tank top is opened, while the tank bottom is closed. In this case, the tank body 121 can take various shapes such that the horizontal cross-sectional shape thereof is a circle, an ellipse, a quadrangle, a polygon, or the like. Further, a hopper portion 129 is provided at the bottom of the tank body 121. The hopper portion 129 includes inclined surfaces for collecting the electrolytic sludge generated in the electrolytic cell 120 to the cell bottom, for example, a first inclined surface 129a and a second inclined surface 129b extending in a direction intersecting each other. It is configured as follows. The horizontal distance between the first inclined surface 129a and the second inclined surface 129b, and thus the horizontal cross-sectional area of the hopper portion 129 in each part of the tank main body 121 becomes smaller toward the tank bottom. The hopper portion 129 may be configured to include three or more inclined surfaces as necessary. On the other hand, both the inflow port 121a and the outflow port 121b are provided in the upper part of the tank separated from the tank bottom by a predetermined distance in the vertical direction of the tank body 121. That is, in this tank main body 121, a height difference is provided between the inlet 121a and outlet 121b and the tank bottom.

  According to the electrolytic tank 120 having the above-described configuration, the water that has flowed into the tank body 121 through the inlet 121a (discharge port 162 of the circulation pump 160) stays in the tank for a predetermined time, and then from the electrolytic tank 120 through the outlet 121b. It flows out to the contaminant removal tank 110. In addition, according to the structure which supplies the circulating water by the circulation pump 160 into the tank main body 121, the dissolved oxygen for oxidizing a bivalent iron ion (Fe2 +) in the above-mentioned electrolytic treatment reaction is passed through the circulation pump 160. Can be reliably supplied. Therefore, in the case where dissolved oxygen related to the electrolytic treatment reaction can be provided only by circulating water from the circulation pump 160, the air diffuser 128 can be omitted in order to simplify the structure.

  On the other hand, the flow rate of the water flow (also referred to as “circulation flow”) toward the outlet 121b on the circulation path of the circulation pump 160 is a predetermined flow rate that can impart an upward flow to the electrolytic sludge. By setting so that it may exceed, the said electrolytic sludge is transferred to the outflow port 121b with an upward flow, and is discharged | emitted from the tank main body 121. FIG. Further, the air diffuser 128 installed at the bottom of the tank body 121 functions to generate a water flow toward the outlet 121b by the air flow of the diffused air supplied upward. At this time, a swirling flow is generated in the electrolytic bath 120 by the hopper portion 129, and it is possible to prevent electrolytic sludge from accumulating at the bottom portion by being sufficiently stirred. Therefore, the electrolytic sludge is further transferred to the upper part of the tank by the upward flow due to the diffuser action of the diffuser pipe 128, and reliably discharged from the tank body 121 through the outlet 121b. Therefore, as a result, it is possible to prevent the electrolytic sludge generated by the electrolytic treatment from accumulating in the electrolytic cell 120.

  Here, the mechanism that suitably sets the flow rate of the circulating water by the circulation pump 160 and the mechanism that uses the diffuser pipe 128 are configured so that the electrolytic sludge generated in the electrolytic cell 120 is outside the electrolytic cell 120 by the water flow toward the outlet 121b. The air discharge function is achieved and constitutes the “air diffuser (air diffuser mechanism)” and the “discharge part” in the present invention. Thereby, the electrolytic sludge can be quickly discharged to the contaminant removal tank 110 and stored in the contaminant removal tank 110. In particular, by providing a structure for increasing the amount of circulating water, it becomes easier to discharge the electrolytic sludge from the electrolytic cell 120 to the contaminant removal tank 110.

  Moreover, as shown in FIG. 3, while the tank bottom part of the tank main body 121 is closed, the water in the tank main body 121 is divided with the water in the contaminant removal tank 110 via the tank wall, and The inflow port 121a and the outflow port 121b are disposed higher than the water level (water level line WL in FIG. 3) of the contaminant removal tank 110. Thereby, it becomes possible to prevent the floating sludge in the contaminant removal tank 110 from flowing into the electrolytic tank 120. The “closed portion” in the present invention is configured by the closed structure of the tank bottom portion of the tank body 121 here.

As described above, the electrolytic bath 120 of the present embodiment prevents the electrolytic sludge generated by the electrolytic treatment using the metal electrodes 125 and 125 from accumulating on the bottom of the bath body 121, and the contaminant removal bath 110. Is provided with a suppression mechanism (corresponding to the “suppression mechanism” in the present invention) that suppresses the performance degradation of the electrolytic treatment by preventing the floating sludge from flowing into the tank body 121. That is, in the present embodiment, the suppression mechanism includes at least a tank main body 121 configured to close the tank bottom and partition the water in the tank from the water in the contaminant removal tank 110, and the tank main body 121. The hopper 129 provided at the bottom of the tank and an air diffusion mechanism for transferring the electrolytic sludge to the outlet 121b by the circulating flow and the upward flow by the air diffusion pipe 128 are configured. Further, by preventing the accumulation of electrolytic sludge in the tank body 121, the air diffuser 128 is less likely to be blocked, and the cleaning operation can be easily performed. Further, the diffuser 128 is used as a transfer means for transferring the electrolytic sludge by applying an upward flow to the electrolytic sludge, and as a supply source for supplying dissolved oxygen for metal ion oxidation during the electrolytic treatment. Is reasonable.
In the present embodiment, the contact filter is installed by installing the electrolytic cell 120 in the contaminant removal tank 110 (solid-liquid separation treatment area), which is a different area from the contact filter bed tank 140 (aerobic treatment area). It is possible to suppress the diffusion tube 142 of the floor tank 140 from being blocked with a metal such as iron generated by the electrolytic treatment. In addition, it is preferable to provide another process area (typically an anaerobic filter bed tank) between the area | region where the sludge by electrolysis is discharged | emitted, and an aerobic process area. Since there is an anaerobic treatment region filled with a filter medium between the solid-liquid separation region and the aerobic treatment region, it is possible to suppress the capture of metals such as iron to the anaerobic treatment region and flow into the aerobic treatment region. The obstruction of the diffusing tube in the aerobic treatment region can be effectively prevented.

  Note that the diffuser tube 128 having the above-described configuration is further disposed below the iron electrodes 125 and 125 of the electrode device 123, so that the adhering matter adhering to the electrode surface of each electrode 125 can be diffused by the diffuser tube 128. It is preferable to perform the function of peeling by action. Further, a plurality of carriers are filled in the tank body 121 in a flowable state, and the carriers are caused to flow by the diffuser action of the diffuser tube 128 and collide with the electrode surface of each electrode 125, whereby the electrode of each electrode 125 It can also comprise so that the deposit | attachment adhering to the surface may be peeled.

  In the present embodiment, the contaminant removal tank 110 in which the electrolytic tank 120 is arranged is configured as a region for performing solid-liquid separation treatment of water to be treated by the principle of sedimentation separation without interposing a filter bed filled with a filter medium. ing. Since such a contaminant removal tank 110 is not provided with a filter bed or an air pipe, it is easy to secure an installation space for the electrolytic tank 120 and a visual field, so that it is easy to replace the metal electrodes 125 and 125. Can be done.

(Second Embodiment)
Instead of the electrolytic cell 120 having the above-described configuration, an electrolytic cell 220 according to another embodiment as shown in FIG. 4 may be employed. In this electrolytic tank 220, in the case of the electrolytic tank 120, a discharge pump 228 is used instead of the diffuser pipe 128 installed at the bottom of the tank. The discharge pump 228 is configured as an air lift type air lift pump, and is disposed between the suction port 228a disposed at the bottom of the tank, the discharge port 228b disposed at the outflow port 121b, and between the suction port 228a and the discharge port 228b. The air supply pipe 228c is provided. Accordingly, the discharge pump 228 is configured to operate when air is supplied into the pump body through the air supply pipe 228c, and exhibits a pumping action in this operating state.

  According to this configuration, the electrolytic sludge generated by the electrolytic treatment of water by the electrode device 123 is settled and separated in the tank body 121, while the pumping action of the discharge pump 228 in which the suction port 228a is installed at the bottom of the tank ( It is transferred to the upper part of the tank by suction / discharge action) and reliably discharged from the tank body 121 to the contaminant removal tank 110 together with water through the outflow port 121b. That is, the discharge pump 228 performs a function of generating a water flow toward the outlet 121b, thereby discharging the electrolytic sludge to the outside of the electrolytic tank 220. The discharge pump 228 here corresponds to the “air lift pump (air lift mechanism)” and “discharge section” in the present invention. As a result, when the electrolytic sludge is about to settle on the tank bottom of the tank body 121 or once settled on the tank bottom, it is transferred to the tank top by the pumping action of the discharge pump 228 and discharged. In particular, it is possible to prevent electrolytic sludge from accumulating in the electrolytic cell 220.

  In the electrolytic tank 120 and the electrolytic tank 220 having the above-described configuration, when the amount of water flowing into the treatment tank main body 101 through the inflow pipe 102 increases and the water level rises, the amount of circulating water by the circulation pump 160 temporarily increases. It is preferable to be configured as follows. Thereby, since the stirring effect of the electrolytic sludge in the tank main body 121 increases by the amount of water supplied into the tank main body 121 increasing, it becomes possible to enhance the discharge action of the electrolytic sludge.

  In addition, the air diffusion pipe 128 of the electrolytic cell 120 having the above-described configuration and the discharge pump 228 of the electrolytic cell 220 may be omitted as necessary. In this case, the electrolytic tanks 120 and 220 can be configured such that the electrolytic sludge generated by the electrolytic treatment is stirred by the flow rate of the water flowing to the outlet 121b and discharged from the tank main body 121 together with the water. Therefore, when the air diffuser 128 and the discharge pump 228 are omitted, the compartment is partitioned to form a flow path in the tank body 121 so as to obtain an upward flow having a predetermined flow rate toward the outlet 121b. A plate (baffle plate) is preferably attached.

(Third embodiment)
Instead of the electrolytic cells 120 and 220 having the above configuration, an electrolytic cell 320 of another embodiment as shown in FIG. 5 may be employed. In this electrolytic tank 320, for example, the bottom of the tank is closed like the electrolytic tank 120, whereas the bottom of the tank body 121 is open. Specifically, a hopper portion 129 at the bottom of the tank body 121 is provided with a bottom opening 129c for constantly communicating the inside and outside of the tank body 121 at the tank bottom. In this case, by providing the bottom opening 129c, the water level in the tank main body 121 and the water level in the contaminant removal tank 110 substantially match. Further, regarding the first inclined surface 129a and the second inclined surface 129b extending in the direction intersecting with each other, the second inclined surface 129b is separated from the first inclined surface 129a with the bottom opening 129c therebetween. . The hopper portion 129, the first inclined surface 129a, the second inclined surface 129b, and the bottom opening 129c referred to here are the “hopper portion”, “first inclined surface”, and “second inclined surface” in the present invention, respectively. And “bottom opening”.

  As shown in FIG. 6 in particular, the second inclined surface 129b is configured such that the tip 129e does not close the bottom opening 129c, and the electrolytic cell 320 (tank body 121) is placed below the cell (in the direction of arrow A in FIG. 5). Only when viewed from above, the bottom opening 129c is extended downward from the front end 129d of the first inclined surface 129a so as to shield the bottom opening 129c. That is, in the present embodiment, the relative arrangement of the first inclined surface 129a and the second inclined surface 129b is set so that the bottom opening 129c is not visible when the electrolytic cell 320 is viewed from below the cell. Yes. Therefore, the “shielding portion” in the present invention is constituted by the first inclined surface 129a and the second inclined surface 129b mentioned here. In such a configuration, water discharged from the circulation pump 160 flows into the tank body 121 through the inlet 121a, while water in the tank is removed from the tank body 121 through the bottom opening 129c of the hopper portion 129 from the contaminant removal tank 110. Spill into. At this time, the electrolytic sludge collected intensively on the bottom of the tank via the hopper 129 is prevented from being deposited on the bottom of the tank due to the aeration action of the diffuser pipe 128, and the electrolytic sludge passes through the bottom opening 129c. It is discharged from the tank body 121 together with water.

  On the other hand, according to the relative arrangement structure of the first inclined surface 129a and the second inclined surface 129b as described above, the floating sludge in the contaminant removal tank 110 flows into the electrolytic tank 320. It becomes possible to stop. Specifically, since the second inclined surface 129b shields the bottom opening 129c from the lower side, when floating sludge floats upward from the bottom of the contaminant removal tank 110 to the top of the tank, the floating The property sludge is prevented from flowing into the bottom opening 129c side. In addition, the floating sludge floats while the outer surfaces of the first inclined surface 129a and the second inclined surface 129b are spaced outward from the bottom opening 129c according to the inclination angle of the inclined surface. The effect of preventing floating sludge from flowing into the bottom opening 129c is enhanced. In the present embodiment, the inclined surface, which is a constituent element of the hopper portion 129, is rational because it functions as both a collecting function for electrolytic sludge and a shielding function for the bottom opening 129c.

  In the electrolytic tank 320 having the above-described configuration, the electrolytic sludge collected by the hopper 129 can be smoothly discharged through the bottom opening 129c, and dissolved necessary to oxidize divalent iron ions to trivalent iron ions. When oxygen can be supplied by circulating water, the air diffuser 128 can be omitted. On the other hand, when installing the diffuser pipe 128, it is possible to adopt a configuration in which an outlet (for example, the outlet 121b in FIG. 3) is provided in the tank body 121 in addition to the bottom opening 129c. A part of the gas can be transferred to the outflow port and discharged to the contaminant removal tank 110 by the diffuser action of the diffuser tube 128.

(Fourth embodiment)
As an example of a change of the electrolytic cell connected to the circulation path of the circulation pump 160, such as the electrolytic cell 120, 220, 320 of the above embodiment, an electrolytic cell 520 provided in the water treatment apparatus 200 shown in FIG. In addition, the electrolytic cell of another embodiment provided independently of the circulation path of the circulation pump 160 may be employed. The electrolytic bath 520 has the same configuration as the electrolytic bath 320 shown in FIG. 5 except that the pump discharge section 162 of the circulation pump 160 is not connected to the bath body 121. As shown in FIG. 8, in this electrolytic cell 520, a bottom opening 129c formed between the first inclined surface 129a and the second inclined surface 129b of the hopper portion 129 allows the water in the contaminant removal tank 110 to flow. It is configured as an inlet for flowing into the tank body 121 and as an outlet for allowing water in the tank body 121 to flow out into the contaminant removal tank 110. Accordingly, the bottom opening 129c referred to here corresponds to the “inlet” and “outlet” in the present invention.

  According to this configuration, since the pump discharge part 162 of the circulation pump 160 is not connected to the tank main body 121, only the water that has flowed into the tank main body 121 through the bottom opening 129 c of the hopper 129 is electrolyzed by the electrode device 123. The At this time, the electrolytic sludge generated in the tank main body 121 by the electrolytic treatment is discharged from the tank bottom through the bottom opening 129c of the hopper 129. In other words, in the present embodiment, the bottom opening 129c of the hopper portion 129 also serves as an inlet and an outlet for the tank body 121, and the tank body 121 passes from the contaminant removal tank 110 through the bottom opening 129c (inlet). The water flowing into the inside is subjected to electrolytic treatment through the metal electrodes 125, 125, and then flows out again to the contaminant removal tank 110 through the bottom opening 129c (outlet). As a result, the electrolytic sludge collected by the hopper 129 at the bottom of the tank is smoothly discharged through the bottom opening 129c, so that the electrolytic sludge can be prevented from accumulating in the electrolytic tank 520. On the other hand, floating sludge in the contaminant removal tank 110 is prevented from flowing into the electrolytic tank 520 by the action of the second inclined surface 129b that shields the bottom opening 129c from the lower side of the hopper part 129. . Thus, water in the contaminant removal tank 110 can be continuously subjected to electrolytic treatment with the electrolytic tank 520. Moreover, since the inflow port and the outflow port are shared by the bottom opening 129c, it is reasonable. In addition, instead of the bottom opening 129c, the inflow port and the outflow port can be configured by independent opening portions as necessary.

(Fifth embodiment)
As a modified example of the electrolytic cell 520 having the above-described configuration, an electrolytic cell 620 according to another embodiment as shown in FIG. 9 may be employed. In this electrolytic cell 620, in the case of the electrolytic cell 520, a discharge pump 228 similar to that in the case of the electrolytic cell 220 is used instead of the diffuser pipe 128 installed at the bottom of the cell. According to this configuration, a part of the electrolytic sludge generated by the electrolysis of water by the electrode device 123 is discharged from the bottom of the tank through the bottom opening 129c of the hopper section 129, while sinking to the bottom of the tank body 121. When trying to do so, or once settled on the bottom of the tank, it is transferred to the upper part of the tank by the pumping action of the discharge pump 228 and discharged. As a result, it is possible to prevent the electrolytic sludge from accumulating in the electrolytic cell 620 as a result.

  Of the electrolytic cells of the above-described embodiment, especially for electrolytic cells 320, 420, 520, and 620 having an opening at the bottom of the tank, the shape of the tank body of the electrolytic cell and the shape of the hopper 129 at the bottom of the tank are as required. Various modifications are possible. 10 to 13 are referred to for this modification example.

In the modified example shown in FIG. 10, regarding the first inclined surface 129a and the second inclined surface 129b of the hopper portion 129 of the tank body 121, a bottom opening 129c is provided on the inclined surface. Although not particularly shown, the circulated treated water flows from the upper part of the tank body 121 and flows out from the bottom opening 129c provided in the lower part (position lower than the inflow part) of the tank body 121. . For this reason, in the tank main body 121, the flow of the process water which goes below, ie, a downward flow, will be formed. Due to this downward flow, the electrolytic sludge generated in the tank body 121 smoothly flows out from the bottom downward 129c. Furthermore, although the bottom opening 129c faces directly in the primary treatment tank, a configuration in which sludge does not easily flow from the outside of the tank through the bottom opening 129c is obtained. That is, the downward flow of the treated water in the tank body 121 and the bottom opening 129c form an implementation configuration example corresponding to the “suppression mechanism” in the present invention.
Further, in the modified example shown in FIG. 11, the hopper portion 129 of the tank body 121 has an extending surface that extends in the vertical direction and is connected to the first inclined surface 129a and the second inclined surface 129b. A bottom opening 129c is provided on the existing surface. In the modification shown in FIG. 12, another member 121e provided separately from the tank body 121 is configured to shield the tank bottom of the hopper 129 with the bottom opening 129c therebetween. In the modified example shown in FIG. 13, the hopper portion 129 of the tank body 121 includes a first inclined surface 129a and a vertical surface 129f separately from the first inclined surface 129a, and a bottom portion on the vertical surface 129f. An opening 129c is provided. In each modified example, the tank body 121 was viewed from below the tank, for example, as in the above-described electrolytic tank 320, in order to prevent the floating sludge in the contaminant removal tank 110 from entering the electrolytic tank. It is preferable to adopt a configuration in which the bottom opening 129c is shielded only in this case.

[Other Embodiments]
In addition, this invention is not limited only to said embodiment, A various application and deformation | transformation can be considered. For example, each of the following embodiments to which the above embodiment is applied can be implemented.

  In the water treatment apparatus of the above embodiment, the case where the water treatment unit 101b is constituted by the treatment elements of the primary treatment tanks 110 and 130, the secondary treatment tanks 140 and 150, and the disinfection tank 170 has been described. Then, various selections can be made as necessary with respect to the number and type of treatment elements constituting the water treatment unit 101b.

  Moreover, in the said embodiment, although the water treatment apparatus which processes raw | natural water discharged | emitted from a general household, an apartment house, etc. was described, this invention is a commercial facility, a public facility, a factory, etc. other than an ordinary household, an apartment house. It can also be applied to a water treatment apparatus that treats raw water discharged from these facilities.

In the present invention and the above-described embodiment according to the present invention, the following is further listed as usefulness of disposing the electrolytic cell in the solid-liquid separation treatment region.
(1) The electrolytic cell is disposed in a region separated from the aerobic treatment region, and a partition member such as a partition plate is actually disposed between the aerobic treatment region and the solid-liquid separation treatment region. The risk of foaming in the aerobic treatment region and aeration of the aerobic gas reaches the electrolytic cell equipment, such as the relay box, and the like, for example, the connectors are submerged to adversely affect operation and the like.
(2) While disposing the electrolytic cell in a region separated from the aerobic treatment region, a partition member such as a partition plate is actually disposed between the aerobic treatment region and the solid-liquid separation treatment region, Chlorine gas in the disinfection tank reaches the electrolytic cell equipment, and the risk of corrosion of connectors, cell bases, etc. is minimized.

DESCRIPTION OF SYMBOLS 100 ... Water treatment apparatus 101 ... Treatment tank main body 101a ... Accommodating space 101b ... Water treatment part 102 ... Inflow pipe 103 ... Outflow pipe 104 ... Manhole part 110 ... Primary treatment tank (contaminant removal tank)
DESCRIPTION OF SYMBOLS 111 ... Baffle plate 112 ... Advection opening 120 ... Electrolysis tank 121 ... Tank main body 121a ... Inlet 121b ... Outlet 121c ... Support member 121d ... Insertion hole 121e ... Separate member 122 ... Support leg 123 ... Electrode apparatus 124 ... Electrode holding part 124a ... Main body 124b ... Sealing lid 124c ... Handle 125 ... Metal electrode 126 ... Connection cable 127 ... Control device 128 ... Air diffuser 129 ... Hopper part 129a ... First inclined surface 129b ... Second inclined surface 129c ... Bottom opening 129d , 129e ... tip portion 129f ... vertical surface 130 ... primary treatment tank (contact filter bed tank)
131 ... Filter bed 132 ... Advection opening 140 ... Secondary treatment tank (contact filter bed tank)
DESCRIPTION OF SYMBOLS 141 ... Filter bed 142 ... Air diffuser 150 ... Treatment water tank 160 ... Circulation pump 161 ... Pump suction part 162 ... Pump discharge part 163 ... Air supply pipe 170 ... Disinfection tank 171 ... Drug cylinder 172 ... Discharge pump 173 ... Suction port 174 ... Exhalation Outlet 175 ... Overflow weir 200 ... Water treatment device

Claims (7)

A treatment tank body having a storage space;
A plurality of water treatment areas respectively arranged in the accommodation space to perform predetermined water treatment of the water to be treated;
Among the plurality of water treatment regions, a solid-liquid separation treatment region for subjecting the water to be treated to solid-liquid separation, and
Among the plurality of water treatment regions, an aerobic treatment region for aerobic treatment of water after solid-liquid separation treatment in the solid-liquid separation treatment region;
An electrolytic cell disposed in the solid-liquid separation region;
A metal electrode immersed in water in the electrolytic cell for electrolytic treatment;
An inlet for allowing water before electrolytic treatment to flow into the electrolytic cell;
An outlet for discharging water after electrolytic treatment from the electrolytic cell;
A control device for controlling power feeding to the metal electrode;
The electrolytic sludge generated by the electrolytic treatment with the metal electrode is prevented from accumulating at the bottom of the electrolytic cell and the floating sludge in the solid-liquid separation region is prevented from flowing into the electrolytic cell. A suppression mechanism that suppresses performance degradation of the electrolytic treatment,
A circulation path for circulating a part of the water after being aerobically treated in the aerobic treatment region to the solid-liquid separation treatment region;
The electrolytic cell is disposed on the circulation path, and water circulating through the circulation path flows into the electrolytic cell through the inlet after being aerobically treated in the aerobic treatment region, After the electrolytic treatment through the electrode, it is configured to flow out to the solid-liquid separation treatment region through the outlet.
By varying the water level in the pre-Symbol treatment tank body, the water treatment apparatus characterized by structure for increasing the circulating amount of water circulating through the circulation path is provided. The water treatment device according to claim 1,
The suppression mechanism includes a closed portion that closes the bottom of the tank so as to prevent the floating sludge in the solid-liquid separation treatment region from flowing into the electrolytic tank, and the electrolytic sludge generated in the electrolytic tank. A water treatment apparatus, comprising: a discharge unit configured to discharge the electrolytic cell to the outside by a water flow toward the outlet. The water treatment device according to claim 1,
The suppression mechanism includes a hopper formed at the bottom of the tank to collect the electrolytic sludge generated in the electrolytic tank at the bottom of the tank and the inside and outside of the electrolytic tank at the tank bottom at all times. A bottom opening provided in the hopper, and a shielding part arranged to shield the bottom opening only when the electrolytic cell is viewed from below the tank without closing the bottom opening. Water treatment equipment. The water treatment device according to claim 3,
The hopper portion has a first inclined surface extending in a predetermined direction, and a second inclined surface extending in a direction intersecting the predetermined direction and spaced apart from the first inclined surface with the bottom opening therebetween And the shielding part shields the bottom opening only when the electrolytic cell is viewed from below the tank without the tip of the second inclined surface closing the bottom opening. 1. A water treatment apparatus, characterized in that the water treatment apparatus is configured to extend downward from a front end portion of an inclined surface of 1. The water treatment apparatus according to any one of claims 2 to 4,
The suppression mechanism includes an air diffusion mechanism that generates a water flow toward the outlet by an air flow of air diffused upward supplied from an air diffuser provided at the bottom of the tank. The water treatment apparatus is configured to discharge the electrolytic sludge generated in step 1 to the outside of the electrolytic cell using the aeration mechanism. The water treatment apparatus according to any one of claims 2 to 4,
The suppression mechanism includes an air lift mechanism that generates a water flow toward the outlet by an air lift type air lift pump provided in the electrolytic cell, and thereby the electrolytic sludge generated in the electrolytic cell is It is comprised so that it may discharge | emit out of the said electrolytic vessel using a mechanism, The water treatment apparatus characterized by the above-mentioned. The water treatment device according to any one of claims 1 to 6,
The solid-liquid separation treatment region is configured as a region for performing solid-liquid separation treatment of water to be treated by the principle of sedimentation separation without interposing a filter bed filled with a filter medium.

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