JP6657524B2 - Water treatment equipment - Google Patents

Description

  The present invention relates to a water treatment device for treating wastewater such as domestic wastewater.

  JP-A-2000-197892 discloses a septic tank. This septic tank includes a first anaerobic filter bed tank, a second anaerobic filter bed tank, a carrier fluidizing tank, a sedimentation tank, and a disinfecting tank. The water to be treated is configured to flow through each tank by natural advection.

JP 2000-197892 A

  Generally, in a septic tank equipped with an anaerobic treatment tank that performs anaerobic treatment on the water to be treated and an aerobic treatment tank that performs aerobic treatment downstream of the anaerobic treatment tank, a large amount of sludge is accumulated particularly in the aerobic treatment tank. If (precipitation) occurs, the treatment efficiency of the water to be treated may decrease. Therefore, it is required that sludge flowing into the aerobic treatment tank from the anaerobic treatment tank and sludge generated in the aerobic treatment tank be efficiently transferred to a tank capable of storing sludge different from the aerobic treatment tank. In the above-mentioned septic tank, since the to-be-processed water flows through each tank by natural advection, the same amount of the to-be-processed water as the sewage flowing into the septic tank is discharged from the septic tank. In this septic tank, the water to be treated is circulated by air lift pumps respectively set in the second anaerobic filter bed tank and the carrier fluidizing tank, and the sludge settled in the tank is returned to the first anaerobic filter bed tank. However, the water levels of the first anaerobic filter tank, the second anaerobic filter tank and the carrier fluidizing tank are always kept constant. Therefore, the head of the air lift pump for returning sludge and water to be treated does not change. That is, the amount of water returned by the air lift pump does not change. If the amount of water returned by the air lift pump is small, the return efficiency of sludge may decrease. On the other hand, when the amount of water returned by the air lift pump is large, the flow velocity in the tank increases, so that the sludge to be returned cannot be sufficiently settled near the suction port of the air lift pump. As a result, the sludge return efficiency may decrease. In the septic tank where the water level is kept constant as described above, in order to return sludge efficiently, it is necessary to change the amount of water returned by the air lift pump. That is, the sludge in the tank is efficiently settled in a state where the amount of water returned by the air lift pump is low, and the sludge can be efficiently returned by temporarily changing the state to a large amount of water returned by the air lift pump. In order to change the amount of water returned by the air lift pump in the above-mentioned septic tank, it is necessary to change the air volume of the blower, which requires a blower air volume control mechanism. The present invention has been made in view of this point, and in a water treatment apparatus having a circulating device for circulating treated water and transferring sludge, the circulating device controls the treated water in accordance with the level of the treated water. It is another object of the present invention to provide a technology for efficiently transferring sludge.

  The above problems are solved by the present invention. According to a preferred embodiment of the water treatment apparatus according to the present invention, a water treatment apparatus that performs treatment on water to be treated including sludge is configured. The water treatment apparatus includes an inflow tank, an anaerobic treatment tank, an aerobic treatment tank, a treatment water tank provided downstream of the aerobic treatment tank, and a transfer device for discharging treated water for discharging treated water, A first circulation device and a second circulation device are provided. The water to be treated flowing into the inflow tank is sequentially processed in the anaerobic treatment tank and the aerobic treatment tank. The treated water discharge transfer device is provided to transfer the treated water to be discharged. Preferably, the treatment water discharging transfer device is provided to discharge the treatment water subjected to the aerobic treatment in the aerobic treatment tank. The transfer device for discharging the treated water may be configured to directly discharge the treated water to the outside of the water treatment device, and may further be disposed in a further treatment tank (for example, a disinfection tank) in the water treatment device. ) May be configured to drain water. The first circulation device transfers the water to be treated in the anaerobic treatment tank to the inflow tank, and circulates the water to be treated between the inflow tank and the anaerobic treatment tank. The second circulation device transfers the water to be treated in the aerobic treatment tank to the inflow tank, and circulates the water to be treated among the inflow tank, the anaerobic treatment tank, and the aerobic treatment tank. The first circulation device and the second circulation device transfer sludge together with the water to be treated. The levels of the water to be treated in the inflow tank, the anaerobic treatment tank and the aerobic treatment tank are configured to be variable at the same height. That is, the water to be treated can move between the inflow tank and the anaerobic treatment tank, and can move between the anaerobic treatment tank and the aerobic treatment tank. Thereby, the water level of the to-be-processed water in an inflow tank, an anaerobic treatment tank, and an aerobic treatment tank can be changed between a high water level position and a low water level position.

The transfer device for discharging the water to be treated, the first circulating device, and the second circulating device preferably include various pumps such as an air lift pump and a submersible pump . In the present invention, the first circulating device includes the anaerobic treatment tank. A first air lift pump for transferring sludge deposited near the bottom of the aerobic treatment tank together with the water to be treated to the inflow tank, wherein the second circulating device treats sludge deposited near the bottom of the aerobic treatment tank It has a 2nd air lift pump which transfers to the said inflow tank with water.

  Preferably, the transfer amount for transferring the water to be treated is variable according to the level of the water to be treated in the inflow tank, the anaerobic treatment tank, and the aerobic treatment tank. Specifically, when the water level of the water to be treated is low, the transfer amount is set to be small, and when the water level of the water to be treated is high, the transfer amount is set to be large. When an air lift pump is used as the transfer device for discharging the treated water, the first circulating device, and the second circulating device, the head automatically changes according to the level of the treated water in the water treatment tank. The transfer amount of the treated water is variable. Note that a configuration may be employed in which the transfer amount of the water to be treated is variable by controlling the amount of air supplied to the air lift pump according to the level of the water to be treated.

  According to the present invention, since the treated water discharging transfer device for discharging the treated water to be treated is provided, the treated water held at the same water level in the inflow tank, the anaerobic treatment tank and the aerobic treatment tank is provided. The water level is changed. Therefore, when drainage does not flow into the water treatment device from the outside, the water level of the water to be treated in each tank becomes low due to the discharge of the water to be treated by the treatment water discharge transfer device. In a state where the water level is lowered, by reducing the transfer amount of the water to be treated by the first circulation device and the second circulation device, the flow velocity in the tank is reduced, and the sludge in the water to be treated can be settled efficiently. . Then, when drainage flows into the apparatus to be treated from the outside and the level of the to-be-treated water rises above the low water level, the transfer amount of the to-be-treated water by the first circulator and the second circulator is increased. This can increase the amount of sludge transferred together with the water to be treated. As a result, the sludge settled in the anaerobic treatment tank and the aerobic treatment tank can be efficiently transferred to the inflow tank. In particular, by adopting an air lift pump in the first circulation device and the second circulation device, the water level can be controlled without providing a device for controlling the transfer amount of the air lift pump by utilizing the fluctuation of the air lift pump caused by the fluctuation of the water level. When the pressure rises, the transfer amount of the water to be treated and the sludge can be increased. By efficiently transferring the sludge settled in the anaerobic treatment tank and the aerobic treatment tank to the inflow tank, the water to be treated in each tank can be efficiently treated. Thereby, the capacity of each tank in the water treatment device can be reduced. Therefore, an increase in the size of the water treatment device can be suppressed.

  Further, according to the water treatment apparatus according to the present invention, the aerobic treatment tank is configured such that the water to be treated is transferred by the downward flow, and the aerobic filter medium for aerobically treating the water to be treated is disposed. It is composed of one tank. The treatment water tank is configured such that water to be treated from the aerobic treatment tank is transferred by an upward flow.

  According to this configuration, the water to be treated is transferred by the downward flow and is treated by the aerobic filter medium. Therefore, after aerobic treatment, sludge is likely to settle. Preferably, the second circulation device is provided with an intake port at a position close to the bottom of the aerobic treatment tank so as to transfer the sludge settled together with the water to be treated to the inflow tank. Thereby, the settled sludge can be efficiently transferred to the inflow tank by the second circulation device, and the aerobic treatment of the water to be treated in the aerobic treatment tank can be stabilized.

  According to the water treatment device of the present invention, the aerobic filter medium is configured as a fixed filter bed fixed to the water treatment device. The fixed filter bed is fixed so as not to flow during aerobic treatment of the water to be treated in the aerobic treatment tank. That is, the fixed filter bed is fixed to the wall surface constituting the aerobic treatment tank. Typically, the fixed filter bed is removably attached to a wall. Preferably, the aerobic filter medium is configured as a three-dimensional network. By providing a fixed filter bed, it is possible to change the sludge in the water to be treated to a property that easily precipitates. Note that all of the aerobic filter media may be configured as fixed filter media, or some of the filter media may be fixed and other filter media may be configured as a flowable filter media.

  According to a further aspect of the water treatment apparatus according to the present invention, the first circulation device and the second circulation device can be configured to constantly transfer the water to be treated to the inflow tank.

  According to a further aspect of the water treatment apparatus according to the present invention, the first air lift pump and the second air lift pump can be configured to increase the transfer amount of the water to be treated as the water level of the water to be treated rises. .

  According to a further aspect of the water treatment apparatus according to the present invention, the anaerobic treatment tank is configured such that the water to be treated is transferred by the downward flow, and the anaerobic filter medium for anaerobic treatment of the water to be treated is disposed. It comprises one chamber and a second chamber provided downstream of the first chamber and through which the water to be treated is transferred by an upward flow.

  According to this embodiment, the water to be treated is transferred by the downward flow and is treated by the anaerobic filter medium. Therefore, sludge tends to settle after anaerobic treatment. Preferably, the first circulation device is provided with an intake port at a position close to the bottom of the anaerobic treatment tank so as to transfer the sludge settled together with the water to be treated to the inflow tank. Thereby, the settled sludge can be efficiently transferred to the inflow tank by the first circulation device, and the aerobic treatment of the water to be treated in the aerobic treatment tank can be stabilized.

  According to a further embodiment of the water treatment apparatus according to the present invention, the water to be treated in the inflow tank, the anaerobic treatment tank and the aerobic treatment tank depends on the position of the lower end of the water intake port of the transfer apparatus for discharging treated water in the vertical direction. The low water level for the water level is defined. Preferably, the lower end of the communication hole communicating the anaerobic treatment tank and the aerobic treatment tank is set at a position lower than the lower end of the water inlet of the transfer device for discharging the treated water, and the upper end of the communication hole is closed. It is set at a position higher than the lower end of the water inlet of the transfer device for discharging treated water. Therefore, the low water level position is set in an intermediate region of the communication hole that connects the anaerobic treatment tank and the aerobic treatment tank. Thereby, when the water level of the water to be treated in the inflow tank, the anaerobic treatment tank and the aerobic treatment tank is at the low water level, the water to be treated is circulated between the anaerobic treatment tank and the aerobic treatment tank through the communication hole. . Therefore, the sludge flowing out of the anaerobic treatment tank to the downstream aerobic treatment tank or a part of the sludge generated during the aerobic treatment can be returned to the anaerobic treatment tank. Therefore, the deterioration of the aerobic treatment performance of the water to be treated due to the accumulation of sludge in the aerobic treatment tank is suppressed.

According to a further aspect of the water treatment apparatus according to the present invention, a first partition provided between the inflow tank and the anaerobic treatment tank, and a first partition provided on the first partition and communicating the inflow tank and the anaerobic treatment tank. An opening, a second partition provided between the anaerobic treatment tank and the aerobic treatment tank, and a second opening provided on the second partition and communicating the anaerobic treatment tank and the aerobic treatment tank can be provided. .
In this configuration, the lower position of the water to be treated in the inflow tank, the anaerobic treatment tank and the aerobic treatment tank is defined by the position of the lower end of the water intake port of the transfer apparatus for discharging treated water in the vertical direction. can do.
The lower ends of the first opening and the second opening are set at positions lower than the lower end of the water intake of the transfer apparatus for discharging the treated water, and the upper ends of the first opening and the second opening are set for the transfer for discharging the treated water. It is set at a position higher than the lower end of the water intake of the device, so that the low water level can be set in an intermediate region between the first opening and the second opening.

  According to the present invention, in a water treatment apparatus provided with a circulating device for circulating the water to be treated and transferring the sludge, the circulating device efficiently transfers the sludge together with the water to be treated according to the level of the water to be treated. Technology is provided.

It is a figure showing the outline of the water treatment equipment concerning a 1st embodiment of the present invention. It is a figure which shows the treatment flow of the to-be-processed water in a water treatment apparatus. It is a top view of the water treatment apparatus in the III-III line of FIG. FIG. 4 is a sectional view taken along line IV-IV in FIG. 3. FIG. 5 is a sectional view taken along line VV of FIG. 3. FIG. 6 is a sectional view taken along line VI-VI of FIG. 3. It is sectional drawing which shows the detail of a 3rd air lift pump. It is a figure showing the outline of the water treatment equipment concerning a 2nd embodiment of the present invention. It is a figure which shows the treatment flow of the to-be-processed water in a water treatment apparatus.

  The configuration of the water treatment apparatus according to the first embodiment of the present invention will be described with reference to FIGS. The embodiment of the present invention describes a water treatment apparatus that receives and treats raw water (also referred to as “drainage” or “water to be treated”) discharged from a general home, an apartment house, or the like in a water treatment area. is there.

  As shown in FIG. 1, the water treatment apparatus 100 has a tank-shaped treatment tank main body 101 that forms a frame (outer shell) of the water treatment apparatus 100. As shown in FIGS. 1 and 2, the processing tank main body 101 is formed in a substantially rectangular shape in plan view, and has parallel side walls 101a and 101b, parallel side walls 101c and 101d, a bottom wall 101e and an upper wall. 101f. The water treatment device 100 is a water treatment device configured to treat domestic wastewater (living wastewater) together with human waste.

  As shown in FIG. 1, the processing tank main body 101 includes an inflow pipe 102, an outflow pipe 103, and a manhole 104. The inflow pipe 102 is configured as an opening for introducing water to be treated (raw water) into the internal space of the treatment tank main body 101. The outflow pipe 103 is configured as an opening for discharging the treated water from the internal space of the treatment tank main body 101. The manhole part 104 is configured as a part in which manholes for entering the tank, for inspecting the inside, and for cleaning are formed.

  In addition, the manhole 104 side (upper wall 101f side) of the processing tank body 101 is defined as the tank upper or tank upper part, and the opposite side (bottom wall 101e side) is defined as the tank lower part, the tank lower part or the tank bottom part. You. Further, the inflow pipe 102 side (the side wall 101c side) of the processing tank main body 101 is defined as the upstream side, and the outflow pipe 103 side (the side wall 101d side) is defined as the downstream side. In FIG. 1, the direction along the extending surface of the manhole portion 104 is defined as a horizontal direction (also referred to as a tank front-rear direction), and a direction intersecting the horizontal direction is defined as a vertical direction (also referred to as a tank vertical direction). You. The direction perpendicular to the paper surface of FIG. 1 (the direction perpendicular to the tank longitudinal direction and the tank vertical direction, the vertical direction in FIG. 3) is defined as the tank lateral direction. The arrows in FIGS. 1 to 7 indicate the flow of the water to be treated.

  As shown in FIG. 1, a water treatment area where predetermined water treatment is performed while storing raw water received through the inflow pipe 102 is formed in the internal space of the treatment tank main body 101. In this water treatment area, a sedimentation separation tank 120, a cleaning hole 130, an anaerobic treatment tank 140, an aerobic treatment tank 150, a treatment water tank 160, and a disinfection tank 170 are formed. As shown in FIG. 2, wastewater flowing into the treatment tank main body 101 (inflow baffle 110) through the inflow pipe 102 is transferred to the sedimentation separation tank 120, the anaerobic treatment tank 140, the aerobic treatment tank 150, the treatment water tank 160, and the disinfection tank 170. The water is sequentially buried, and the treated water flows out of the processing tank body 101 through the outflow pipe 103. Further, between the sedimentation separation tank 120 and the cleaning hole 130 and between the anaerobic treatment tank 140 and the aerobic treatment tank 150, the water to be treated is circulated. In addition, the water treatment apparatus 100 may be configured as a purification tank that discharges 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 toilet or water for sprinkling. It may be configured as a water reuse device for reuse.

  The inflow baffle 110 constitutes the most upstream area of the water treatment area. The wastewater flowing into the inflow baffle 110 from the inflow pipe 102 is transferred to the sedimentation separation tank 120. The water to be treated that has flowed into the sedimentation separation tank 120 is subjected to solid-liquid separation treatment, and the solid component separated from the water to be treated is deposited on the bottom of the sedimentation separation tank 120 as settled sludge. When the wastewater flows into the inflow baffle 110, the wastewater flows indirectly into the sedimentation separation tank 120, and the agitation of the settled sludge in the sedimentation separation tank 120 is suppressed. The sedimentation separation tank 120 provided with the inflow baffle 110 is an example of an embodiment corresponding to the “inflow tank” in the present invention.

  As shown in FIG. 1 and FIG. 3, a partition wall 105 extending in the vertical direction of the tank is provided between the sedimentation separation tank 120 and the anaerobic treatment tank 140 on the downstream side thereof. The partition 105 is attached to the side walls 101a and 101b and the bottom wall 101e. As shown in FIG. 4, left and right openings 105 a and 105 b communicating between the sedimentation separation tank 120 and the anaerobic treatment tank 140 are formed in an upper region of the partition wall 105. As shown in FIGS. 3 and 4, a partition wall 131 for partitioning the sedimentation separation tank 120 and the cleaning hole 130 is attached to the partition wall 105. The partition wall 131 is provided apart from the side walls 101a and 101b in the tank lateral direction, and is provided apart from the side walls 101c and 101d in the tank longitudinal direction. With this partition wall 131, the cleaning hole 130 is set in the central region of the partition wall 105 in the tank left-right direction. The openings 105a and 105b are provided on the left and right of the cleaning hole 130 with respect to the cleaning hole 130, respectively.

  As shown in FIG. 1 and FIG. 4, the lower end of the partition wall 131 is arranged so as to be separated from the bottom (bottom wall 101 e) of the processing tank main body 101, whereby the lower region of the sedimentation separation tank 120 is It communicates with the cleaning hole 130. That is, the lower end of the partition wall 131 is formed as a lower end opening 130a of the cleaning hole 130, and the lower end opening 130a is formed so as to be separated upward from the bottom wall 101e. The upper end opening 130b of the cleaning hole 130 at the upper end of the partition wall 131 is formed so as to be separated downward from the upper wall 101f. The cleaning hole 130 is provided with a long and mesh-like filter medium 132 formed as a draft tube and a first air diffusion pipe 190 penetrating the filter medium 132. As shown in FIG. 4, the first air diffuser 190 is arranged in a region on the right side of the cleaning hole 130. When air is supplied from the lower end of the first air diffuser 190 into the cleaning hole 130 through the lower end opening 130a, an upward flow is generated in the right area of the cleaning hole 130, and the left area of the cleaning hole 130 is generated. Generates a downward flow. Thereby, a swirling flow is generated in the cleaning hole 130, and the water to be treated in the cleaning hole 130 is stirred. Therefore, the cleaning hole 130 is also referred to as a stirring hole for stirring the water to be treated.

  The air diffused from the first air diffuser 190 passes through the filter medium 132 and is subdivided. The sludge deposited on the bottom of the sedimentation separation tank 120 is circulated in the cleaning hole 130 together with the water to be treated by a swirling flow (upflow and downflow). In the cleaning hole 130, the sludge is efficiently aerobic-treated by the fragmented air. Due to the fluctuation of the water level in the water treatment area, the sludge in the cleaning hole 130 and the sludge at the bottom of the sedimentation separation tank 120 come and go, thereby supplying the sludge containing bubbles into the sedimentation separation tank 120. As a result, in the sedimentation separation tank 120, the sludge containing air bubbles floats and turns into scum, and the sludge is stored at a high concentration.

  As shown in FIG. 3, the water to be treated in the sedimentation separation tank 120 is transferred to the downstream anaerobic treatment tank 140 through the left and right openings 105a and 105b. The anaerobic treatment tank 140 is an example of an embodiment corresponding to the “anaerobic treatment tank” in the present invention.

  As shown in FIGS. 1, 3 and 5, the anaerobic treatment tank 140 includes a first anaerobic chamber 141 and a second anaerobic chamber 142. Between the anaerobic treatment tank 140 and the aerobic treatment chamber 150 downstream of the anaerobic treatment tank 140, a partition 106 extending in the tank vertical direction is provided. As shown in FIG. 3, a partition wall 143 for partitioning the first anaerobic chamber 141 and the second anaerobic chamber 142 is attached to the front side (upstream side) of the partition wall 106. With this partition wall 143, the second anaerobic chamber 142 is set corresponding to the central region of the partition wall 106 in the tank left-right direction. As shown in FIG. 5, the lower end of the partition wall 143 is arranged so as to be separated from the bottom of the processing tank main body 101, whereby the area below the first anaerobic chamber 141 communicates with the second anaerobic chamber 142. are doing. The first anaerobic chamber 141 and the second anaerobic chamber 142 are examples of an embodiment corresponding to the “first chamber” and the “second chamber” in the present invention, respectively.

  As shown in FIG. 3, a partition wall 161 for partitioning the downstream area of the partition 106 into an aerobic treatment tank 150 and a treatment water tank 160 is attached to the rear side (downstream side) of the partition 106. I have. The length of the second anaerobic chamber 142 defined by the partition wall 143 in the horizontal direction of the tank is set to be longer than the length of the treatment water tank 160 defined by the partition wall 161 in the horizontal direction of the tank. Thereby, as shown in FIGS. 3, 5 and 6, the partition 106 is located outside the partition wall 161 (outside the treated water tank 160) and inside the partition wall 143 (the second Inside the anaerobic chamber 142), left and right openings 106a and 106b communicating the second anaerobic chamber 142 and the aerobic treatment tank 150 are provided. The openings 106a and 106b are an example of an embodiment corresponding to the "communication hole" in the present invention.

  The partition wall 106 is assembled to the processing tank main body 101 with the partition wall 143 and the partition wall 161 attached to the partition wall 106 in advance. That is, the partition 106, the partition wall 143, and the partition wall 161 are configured as an assembly. Thereby, in the manufacturing process of the water treatment apparatus 100, the second anaerobic chamber 142, the aerobic treatment tank 150, and the treated water tank 160 are installed efficiently and simply.

  An anaerobic filter bed 144 filled with a predetermined amount of anaerobic filter material to which anaerobic microorganisms that anaerobically treat organic pollutants adhere is supported by the treatment tank main body 101 in an intermediate region of the first anaerobic chamber 141 in the vertical direction of the tank. It is provided so that. As the anaerobic filter material, a flat filter material or a skeleton-like spherical filter material can be suitably used. In the anaerobic filter bed 144, the water to be treated is subjected to an anaerobic treatment and a filtration treatment, whereby the BOD (biochemical oxygen demand) is reduced and the SS (suspended matter) is removed.

  The water to be treated subjected to the anaerobic treatment in the first anaerobic chamber 141 is transferred from the area below the first anaerobic chamber 141 to the area below the second anaerobic chamber 142 by the downward flow generated in the first anaerobic chamber 141, It rises inside the anaerobic chamber 142. That is, an upward flow occurs in the second anaerobic chamber 142. Thereafter, the water to be treated is transferred from the upper region of the second anaerobic chamber 142 to the aerobic treatment tank 150 through the opening 106a (or the opening 106b).

  In the second anaerobic chamber 142, a first air lift pump 180 is installed. In the second anaerobic chamber 142, sludge transferred from the first anaerobic chamber 141 accumulates, and SS and sludge naturally returned from the aerobic treatment tank 150 through the opening 106 settle. The first air lift pump 180 returns the sludge transferred and accumulated from the first anaerobic chamber 141 and the SS and the sludge naturally returned from the aerobic treatment tank 150 to the inflow baffle 110 together with the water to be treated. The first air lift pump 180 is provided in the second anaerobic chamber 142 where no anaerobic filter bed is provided. Therefore, interference between the first air lift pump 180 and the anaerobic filter bed 144 is avoided. That is, the second anaerobic chamber 142 has the function of circulating the water to be treated flowing into the anaerobic treatment tank 140 as a downward flow in the first anaerobic chamber 141 and performing the anaerobic treatment. Has the function of isolating from The first air lift pump 180 is an example of an embodiment corresponding to the “first circulation device” in the present invention.

  As shown in FIG. 3, on the downstream side of the partition 106, a treated water tank 160 is set in a central region in the tank left-right direction. As shown in FIG. 6, the aerobic treatment tank 150 is formed in the treatment tank main body 101 such that the left region and the right region with the treatment water tank 160 interposed therebetween communicate in a lower region. The lower region of the aerobic treatment tank 150 communicates with the treatment water tank 160.

  As shown in FIG. 6, aerobic filter beds 151a and 151b to which aerobic microorganisms for aerobic decomposition (aerobic treatment) of organic pollutants in water to be treated adhere are provided in the aerobic treatment tank 150. I have. The aerobic filter bed 151a is provided in a region below the aerobic filter bed 151b. The aerobic filter bed 151a is formed of a mesh-like roll-shaped filter medium. Specifically, the filter material in the form of a net-like roll is a net-like body in which a wire made of a resin such as polypropylene or polyethylene is three-dimensionally entangled, and is formed into a cylindrical shape having a diameter of about 100 mm and a length of about 100 mm. Therefore, the aerobic filter bed 151a is configured by filling a predetermined region with a plurality of net-like roll-shaped filter media. The aerobic filter medium of the aerobic filter bed 151a may be a filter medium of a net-like body, a spherical body, a plate-like body, or a filter medium formed of a porous material. On the other hand, the aerobic filter bed 151b is made of a block-like (single) filter medium. Specifically, the block-shaped filter medium is a net-like body in which a wire made of a resin such as polypropylene or polyethylene is three-dimensionally entangled, and is integrally formed in a block shape. Therefore, the upper aerobic filter bed 151b has a function of a lid that prevents a plurality of filter media of the lower aerobic filter bed 151a from flowing out. The aerobic filter bed 151b is held by a holding member such as a net or a plate-like member supported by the processing tank main body 101. In addition, the aerobic filter medium of the aerobic filter bed 151b may be formed into another shape such as a plate shape as long as the filter medium is integrally formed.

  As shown in FIG. 6, the aerobic treatment tank 150 is provided with a second diffuser 191. Thereby, the water to be treated passing through the aerobic filter bed 151 is aerobically treated by the air supplied from the second air diffuser 191. The to-be-processed water subjected to the aerobic treatment by the aerobic filter beds 151a and 151b is transferred to a lower region of the aerobic treatment tank 150.

  As shown in FIGS. 1 and 6, the treatment water tank 160 is provided with a second air lift pump 181. The second air lift pump 181 extends to a lower region of the treatment tank 160. Thus, a part of the water to be treated transferred from the aerobic treatment tank 150 to the treatment water tank 160 is returned to the inflow baffle 110 by the second air lift pump 181 before being transferred to the treatment water tank 160. Thereby, the water to be treated in the water treatment apparatus 100 circulates through the inflow baffle 110, the sedimentation separation tank 120, the anaerobic treatment tank 140, and the aerobic treatment tank 150. The aerobic treatment tank 150 and the treatment water tank 160 are examples of the embodiment corresponding to the “aerobic treatment tank” in the present invention. Further, the aerobic treatment tank 150 and the treatment water tank 160 are examples of the embodiment corresponding to the “third chamber” and the “fourth chamber” in the present invention, respectively. The second air lift pump 181 is an example of an embodiment corresponding to the “second circulation device” in the present invention.

  As shown in FIGS. 1 and 2, a disinfection tank 170 partitioned by a partition wall 171 is provided in the treated water tank 160. Further, the treatment water tank 160 is provided with a third air lift pump 182 for transferring the water to be treated in the treatment water tank 160 to the disinfection tank 170. The third air lift pump 182 is an example of an embodiment corresponding to the “transfer device for discharging treated water” in the present invention.

  As shown in FIG. 7, the third air lift pump 182 mainly includes a pump housing 183 and a partition 187. The pump housing 183 is a bottomed tubular member that extends in the vertical direction in an elongated shape. The pump housing 183 includes a suction port 184, an air supply port 185, and a discharge port 186.

  The suction port 184 is configured as an opening part for sucking the water to be treated into the pump housing 183. As shown in FIG. 1, when the third air lift pump 182 is installed in the treatment water tank 160, the position of the low water level (LWL) of the treatment water tank 160 is set by the suction port 184. The suction port 184 is an example of an embodiment corresponding to the “water intake port” in the present invention.

  The air supply port 185 is connected to air supply means (not shown). Thus, air is supplied into the pump housing 183 via the air supply port 185. The air supply port 185 is provided below the intake port 184 in the vertical direction. The discharge port 186 is configured as an opening for discharging the water to be treated flowing through the inside of the pump housing 183 to the outside of the pump housing 183. The discharge port 186 is provided above the suction port 184 in the vertical direction.

  The middle partition part 187 is a flat partition member extending in the extending direction (vertical direction) of the pump housing 183. The space inside the pump housing 183 is divided into a first flow passage 183a and a second flow passage 183b by the intermediate partition 187. The first flow passage 183a forms a flow path on the suction port 184 side from the partition 187. The second flow passage 184b forms a flow passage from the partition 187 to the discharge port 186 and the air supply port 185 side. The partition 187 is formed integrally with a lid that closes the upper part of the pump housing 183.

  When a predetermined amount of air is supplied from the air supply port 185, the water to be treated flows upward in the second flow passage 183b due to the air flow floating upward in the second flow passage 183b. As a result, the water to be treated is sucked from the suction port 184, and the water to be treated flows downward through the first flow passage 183a. That is, the water to be treated sucked from the treated water tank 160 via the suction port 184 is discharged from the discharge port 186 to the disinfection tank 170 through the first flow path 183a and the second flow path 183b.

  The disinfection tank 170 is provided with a medicine cylinder (not shown) filled with a solid disinfectant for performing disinfection processing. The water that has been subjected to the disinfecting treatment by the disinfectant eluted from the medicine cylinder is discharged to the outside of the treatment tank main body 101 through the outflow pipe 103. Further, another tank, for example, a discharge pump tank provided with a discharge pump may be provided downstream of the disinfection tank 170.

  The first to third air lift pumps 180 to 182 and the first and second air diffusers 190 and 191 are connected to an air supply device (not shown), and the supply and cutoff of air are switched by an air valve. The air valves provided in the first to third air lift pumps 180 to 182 and the first and second air diffusers 190 and 191 are controlled by a controller (not shown) or manually.

  In the water treatment apparatus 100, as shown in FIG. 4, the low water level (LWL) is set in a substantially central region of the openings 105a and 105b in the vertical direction. That is, the openings 105 a and 105 b extend below the lower end of the suction port 184 of the third air lift pump 182. A high water level (HWL) is set above the openings 105a and 105b. Similarly, as shown in FIG. 5, the low water level (LWL) is set in a substantially central region of the openings 106a and 106b in the vertical direction. That is, the openings 106 a and 106 b extend below the lower end of the suction port 184 of the third air lift pump 182. This low water level is an example of an embodiment corresponding to the “low water position” in the present invention. Further, a high water level (HWL) is set above the openings 106a and 106b.

  As shown in FIG. 1, when the water to be treated flows into the water treatment device 100 from the inflow pipe 102, the water level in the sedimentation separation tank 120 rises. As the water level rises, the inside of the anaerobic treatment tank 140, the aerobic treatment tank 150, and the treatment water tank 160 communicating with the sedimentation separation tank 120 through the openings 105a and 105b and the openings 106a and 106b have the same water level. That is, the water to be treated in the sedimentation separation tank 120, the anaerobic treatment tank 140, the aerobic treatment tank 150, and the treatment water tank 160 have the same water level. The water levels of these tanks fluctuate between a low water level and a high water level while being kept at the same water level.

  Specifically, when the water level of the water to be treated is higher than the low water level, the third air lift pump 182 transfers the water to be treated in the treatment water tank 160 to the disinfection tank 170. When the water level of the disinfection tank 170 is higher than the outflow pipe 103, the water to be treated processed in the disinfection tank 170 flows out of the treatment tank main body 101. The transfer of the water to be treated by the third air lift pump 182 lowers the water level of the water to be treated in the sedimentation separation tank 120, the anaerobic treatment tank 140, the aerobic treatment tank 150, and the treatment water tank 160 to the low water level. When the water level of the water to be treated falls to the low water level, the water to be treated is not sucked into the third air lift pump 182 and the transfer of the water to be treated from the treatment water tank 160 to the disinfection tank 170 is shut off. For example, by setting the transfer capacity of the third air lift pump 182, the difference between the high water level and the low water level is maintained at about 10 cm. At this time, it is preferable that the transfer capacity of the third air lift pump 182 is set so as to change from the high water level to the low water level in about one hour. By setting the transfer capacity of the third air lift pump 182 in this way, it is possible to prevent the time required for the transfer water volume of the first air lift pump 180 and the second air lift pump 181 to increase unnecessarily, and to allow the sludge to settle in the tank. It can be a situation that is easy to do.

  On the other hand, the suction ports of the first air lift pump 180 and the second air lift pump 181 are lower than the suction port 184 of the third air lift pump 182, and are set near the bottom of the anaerobic tank 140 and the aerobic tank 150. Therefore, the first air lift pump 180 and the second air lift pump 181 always return sludge to the inflow baffle 110 together with the water to be treated. Therefore, the water to be treated circulates through the sedimentation separation tank 120, the anaerobic treatment tank 140, the aerobic treatment tank 150, and the treated water tank 160 even when the water level of the treated water fluctuates between the low water level and the high water level. I do. Thereby, the water to be treated is efficiently treated in each treatment tank. Therefore, the water treatment apparatus 100 capable of increasing the efficiency of the treatment of the water to be treated is configured, so that the capacity of each tank can be reduced. Therefore, an increase in the size of the water treatment device 100 is suppressed. Further, the sludge can be efficiently returned to the inflow baffle 110 (the sedimentation separation tank 120).

  The heads of the first to third air lift pumps 180 to 182 fluctuate with the fluctuation of the water level in the water treatment area. That is, as the level of the water to be treated in the water treatment area increases, the head becomes shorter, and the transfer amount of the water to be treated by the air lift pump increases. On the other hand, when the level of the water to be treated in the water treatment area is low, the head becomes long, and the transfer amount of the water to be treated by the air lift pump decreases. Therefore, by using the air lift pump, when the drainage flowing into the water treatment apparatus 100 increases and the water level in the water treatment area rises, the capacity of the air lift pump can be increased in accordance with the rise in the water level. For example, the transfer amount of the first air lift pump 180 and the second air lift pump 181 at the time of the high water level is three to six times the transfer amount of the first air lift pump 180 and the second air lift pump 181 at the time of the low water level. It is preferable to set the dimensions and the like of the flow passages in each air lift pump so that the degree is about the same. Thereby, sludge is efficiently returned to the inflow baffle 110 by the first air lift pump 180 and the second air lift pump 181.

  According to the first embodiment described above, in the water treatment apparatus 100, the cleaning holes 130 are arranged so as to be surrounded by the sedimentation separation tank 120 in plan view. Therefore, communication between the sedimentation separation tank 120 and the cleaning hole 130 is achieved in a plurality of directions. That is, the sedimentation separation tank 120 and the cleaning hole 130 communicate with each other in the left-right direction and the front-back direction of the processing tank body 101. Thereby, the water to be treated is efficiently circulated between the sedimentation separation tank 120 and the cleaning hole 130.

  Further, according to the first embodiment, the air supplied from the first air diffuser 190 generates a swirl flow in the water to be treated in the cleaning hole 130, and the flow of the water to be treated by the swirl flow causes the sedimentation / separation tank to flow. The water to be treated is efficiently circulated between the cleaning hole 120 and the cleaning hole 130.

  Further, according to the first embodiment, since the air supplied from the first air diffuser 190 is subdivided by the filter medium 132, the sludge contained in the water to be treated swirling in the cleaning hole 130 is effectively reduced by fine bubbles. Aerobic treatment can be performed. Further, by supplying sludge containing fine bubbles to the sedimentation / separation tank 120, scumming in the sedimentation / separation tank 120 is promoted, and sludge can be stored at a high concentration.

  Further, according to the first embodiment, the water to be treated returned to the inflow baffle 110 by the first air lift pump 180 and the second air lift pump 181 can improve the denitrification performance of the anaerobic filter bed 144. That is, the water to be treated returned from the aerobic treatment tank 150 to the inflow baffle 110 by the second air lift pump 181 contains a large amount of DO (dissolved oxygen), but the inflow baffle 110 from the anaerobic treatment tank 150 by the first air lift pump 180. The water to be treated returned to is low in DO. Therefore, it is possible to suppress an increase in the DO of the water to be treated that is returned into the inflow baffle 110. As a result, the degradation of the denitrification performance of the anaerobic filter bed 144 due to the water to be transferred again to the anaerobic treatment tank 140 is suppressed.

  Next, a configuration of a water treatment apparatus according to a second embodiment of the present invention will be described with reference to FIGS. As shown in FIGS. 8 and 9, in the second embodiment, the cleaning hole 130 and the first air diffuser 190 are not formed in the sedimentation separation tank 120. Also in the second embodiment, as in the first embodiment, the water to be treated is separated by the first air lift pump 180 and the second air lift pump 181 into the sedimentation separation tank 120, the anaerobic treatment tank 140, the aerobic treatment tank 150, and the treated water tank. Circulate 160. Since the sludge is efficiently returned to the sedimentation / separation tank 120, if the capacity of the sedimentation / separation tank 120 is large enough to separate and settle the sludge from the water to be treated, the cleaning hole 130 and the first dispersion The trachea 190 need not be provided.

  In each of the above embodiments, the water treatment apparatus 100 is provided with the air lift pump. However, a submersible pump other than the air lift pump may be provided. In that case, the controller controls the transfer amount of the water to be treated by the submersible pump according to the fluctuation of the water level.

  Further, in the above embodiment, the water treatment apparatus 100 includes the inflow baffle 110, the sedimentation separation tank 120, the cleaning hole 130, the anaerobic treatment tank 140, the aerobic treatment tank 150, the treatment water tank 160, and the disinfection tank 170. Has been described, the number and types of processing elements can be variously selected as necessary.

  Further, in each of the above embodiments, the water treatment apparatus 100 for treating raw water discharged from general homes, apartment houses, and the like has been described. However, the present invention is not limited to general homes, apartment houses, commercial facilities, public facilities, and the like. It can also be applied to a water treatment device that treats raw water discharged from equipment such as factories.

(Correspondence relationship between each component of the embodiment and each component of the present invention)
The above embodiment is an example of an embodiment for carrying out the present invention. Therefore, the present invention is not limited to the configuration of the embodiment. The correspondence between each component of the embodiment and each component of the present invention is shown below.
The water treatment device 100 is an example of a configuration corresponding to the “water treatment device” of the present invention.
The inflow baffle 110 is an example of a configuration corresponding to the “inflow tank” of the present invention.
The sedimentation separation tank 120 is an example of a configuration corresponding to the “inflow tank” of the present invention.
The anaerobic treatment tank 140 is an example of a configuration corresponding to the “anaerobic treatment tank” of the present invention.
The first anaerobic chamber 141 is an example of a configuration corresponding to the “first chamber” of the present invention.
The second anaerobic chamber 142 is an example of a configuration corresponding to the “second chamber” of the present invention.
The aerobic treatment tank 150 is an example of a configuration corresponding to the “aerobic treatment tank” of the present invention.
The aerobic treatment tank 150 is an example of a configuration corresponding to the “third chamber” of the present invention.
The treatment water tank 160 is an example of a configuration corresponding to the “aerobic treatment tank” of the present invention.
The treatment water tank 160 is an example of a configuration corresponding to the “fourth chamber” of the present invention.
The opening 106a is an example of a configuration corresponding to the “communication hole” of the present invention.
The opening 106b is an example of a configuration corresponding to the “communication hole” of the present invention.

The first air lift pump 180 is an example of a configuration corresponding to the “first circulation device” of the present invention.
The second air lift pump 181 is an example of a configuration corresponding to the “second circulation device” of the present invention.
The third air lift pump 182 is an example of a configuration corresponding to the “transfer device for discharging treated water” of the present invention.
The suction port 184 is an example of a configuration corresponding to the “water intake port” of the present invention.

REFERENCE SIGNS LIST 100 Water treatment apparatus 101 Treatment tank main body 101a Side wall 101b Side wall 101c Side wall 101d Side wall 101e Bottom wall 101f Upper wall 102 Inflow pipe 103 Outflow pipe 104 Manhole part 105 Partition 105a Opening 105b Opening 106 Partition 106a Opening 106b Opening 110 Inflow baffle 120 Sedimentation separation tank 130 Cleaning hole 130a Lower end opening 130b Upper end opening 131 Partition wall 132 Filter medium 140 Anaerobic treatment tank 141 First anaerobic chamber 142 Second anaerobic chamber 143 Partition wall 144 Anaerobic filter bed 150 Aerobic treatment tank 151 Aerobic filter bed 160 Treatment water tank 161 Partition wall 170 Disinfection tank 171 Partition wall 180 First air lift pump 181 Second air lift pump 182 Third air lift pump 183 Pump housing 183a First flow path 183b Second flow path 184 Inlet 185 Air supply Port 186 Discharge port 187 Middle partition 190 First diffuser 191 Second diffuser

Claims (9)

A water treatment apparatus that performs treatment on water to be treated including sludge,
An inflow tank into which the water to be treated flows,
An anaerobic treatment tank provided downstream of the inflow tank and anaerobically treating the water to be treated,
An aerobic treatment tank provided downstream of the anaerobic treatment tank and aerobically treating the water to be treated,
A treatment water tank provided downstream of the aerobic treatment tank,
In order to discharge the treated water to the outside of the water treatment device, a treatment device for transferring treated water, and a transfer device for discharging treated water,
A first circulating device that transfers the water to be treated in the anaerobic treatment tank to the inflow tank and circulates the water to be treated;
A second circulator for transferring the water to be treated in the aerobic treatment tank to the inflow tank and circulating the water to be treated,
The first circulation device has a first air lift pump that transfers the sludge deposited near the bottom of the anaerobic treatment tank to the inflow tank together with the water to be treated,
The second circulation device has a second air lift pump that transfers the sludge deposited near the bottom of the aerobic treatment tank to the inflow tank together with the water to be treated.
The aerobic treatment tank is configured by a single chamber in which a water to be treated is transferred by a downward flow, and an aerobic filter medium for aerobically treating the water to be treated is arranged.
The treated water tank is configured such that water to be treated from the aerobic treatment tank is transferred by an upward flow,
The aerobic filter medium is configured as a fixed filter bed fixed to the water treatment device,
The water treatment apparatus, wherein the water levels of the to-be-treated water in the inflow tank, the anaerobic treatment tank, and the aerobic treatment tank are variable at the same height. The water treatment device according to claim 1,
The water treatment apparatus according to claim 1, wherein the first circulation device and the second circulation device are configured to constantly transfer the water to be treated to the inflow tank. The water treatment device according to claim 1 or 2 ,
The water treatment apparatus according to claim 1, wherein the first air lift pump and the second air lift pump are configured so that the transfer amount of the water to be treated increases as the water level of the water to be treated increases. The water treatment device according to any one of claims 1 to 3 ,
The water treatment apparatus, wherein the inflow tank includes a sedimentation separation tank. The water treatment device according to any one of claims 1 to 4 ,
The anaerobic treatment tank is provided downstream of the first chamber in which the anaerobic filter medium for anaerobic treatment of the water to be treated is disposed while the water to be treated is transferred by the downward flow. A water treatment apparatus comprising a second chamber in which water to be treated is transferred by an upward flow. The water treatment device according to any one of claims 1 to 5 ,
The water treatment apparatus, wherein the aerobic filter medium is configured as a three-dimensional net-like body. The water treatment device according to any one of claims 1 to 6 ,
The position of the lower end of the intake port of the transfer device for discharging the treated water in the vertical direction defines a low water level position of the treated water in the inflow tank, the anaerobic treatment tank, and the aerobic treatment tank. A water treatment apparatus characterized by the above-mentioned. The water treatment device according to claim 7 ,
A lower end of a communication hole communicating the anaerobic treatment tank and the aerobic treatment tank is set at a position lower than a lower end of an intake port of the transfer device for discharged water discharge, and an upper end of the communication hole is A water treatment apparatus, wherein the water treatment apparatus is set at a position higher than a lower end of an intake port of a transfer device for discharging treated water, whereby a low water level is set in an intermediate region of the communication hole. The water treatment device according to any one of claims 1 to 8 ,
A first partition provided between the inflow tank and the anaerobic treatment tank;
A first opening provided in the first partition and communicating the inflow tank and the anaerobic treatment tank;
A second partition provided between the anaerobic treatment tank and the aerobic treatment tank,
A second opening provided in the second partition and communicating the anaerobic treatment tank and the aerobic treatment tank,
With
The position of the lower end of the intake port of the transfer device for discharging the treated water in the vertical direction defines a low water level position of the treated water in the inflow tank, the anaerobic treatment tank and the aerobic treatment tank,
The lower ends of the first opening and the second opening are set at positions lower than the lower end of the water intake of the transfer device for discharging treated water, and the upper ends of the first opening and the second opening are It is set at a position higher than the lower end of the water intake of the transfer device for discharging treated water, whereby the low water level is set in the middle area between the first opening and the second opening. Water treatment equipment.

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