JP2016131940A - Water treatment apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technique for efficiently treating water to be treated.SOLUTION: A treatment tank body 101 of a water treatment apparatus 100 is provided with a settling separation tank 120, an anaerobic treatment tank 140, an aerobic treatment tank 150, a treatment water tank 160, and a disinfection tank 170. A third air lift pump 182 is provided which transfers water to be treated in the treatment water tank 160 to the disinfection tank 170. Consequently, the water levels of the settling separation tank 120, the anaerobic treatment tank 140, the aerobic treatment tank 150, and the treatment water tank 160 can fluctuate at the same water level with each other. A first air lift pump 180 transfers water to be treated in the anaerobic treatment tank 140 to the settling separation tank 120, and a second air lift pump 181 transfers water to be treated in the aerobic treatment tank 150 to the settling separation tank 120. Consequently, water to be treated is circulated between the settling separation tank 120, the anaerobic treatment tank 140, the aerobic treatment tank 150, and the treatment water tank 160.SELECTED DRAWING: Figure 1

Description

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

  JP 2000-197892 A discloses a septic tank. The septic tank includes a first anaerobic filter bed tank, a second anaerobic filter bed tank, a carrier fluidized tank, a precipitation tank, and a disinfection tank. And the to-be-processed water is comprised so that it may flow through each tank by natural advection.

JP 2000-197892 A

  In general, 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 an aerobic treatment downstream of the anaerobic treatment tank, a large amount of sludge accumulates particularly in the aerobic treatment tank. (Precipitation) may reduce the treatment efficiency of the water to be treated. Therefore, it is required to efficiently transfer the sludge flowing from the anaerobic treatment tank to the aerobic treatment tank and the sludge generated in the aerobic treatment tank to a tank capable of storing sludge different from the aerobic treatment tank. In the septic tank, since the water to be treated flows through each tank by natural advection, the same amount of water to be treated 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 set in the second anaerobic filter bed tank and the carrier fluidized tank, respectively, and the sludge precipitated in the tank is returned to the first anaerobic filter bed tank. However, the water levels of the first anaerobic filter bed tank, the second anaerobic filter bed tank and the carrier fluidized tank are always kept constant. Therefore, the lift of the air lift pump for returning sludge and treated water does not change. That is, the amount of water returned by the air lift pump does not change. When the amount of water returned by the air lift pump is small, the sludge return efficiency may be reduced. On the other hand, when the amount of water returned by the air lift pump is large, the flow rate in the tank increases, so that the sludge to be returned cannot be sufficiently settled to the vicinity of the suction port of the air lift pump. As a result, the return efficiency of sludge may be reduced. In the septic tank where the water level is kept constant as described above, in order to efficiently return sludge, it is necessary to change the amount of water returned by the air lift pump. That is, sludge can be efficiently returned by efficiently sinking the sludge in the tank while the amount of water returned by the air lift pump is low and temporarily changing to a state where the amount of water returned by the air lift pump is large. In order to change the amount of water returned by the air lift pump in the septic tank, it is necessary to change the air volume of the blower, and a blower air volume control mechanism is required. The present invention has been made in view of this point, and in a water treatment apparatus including a circulation device that circulates water to be treated and transfers sludge, the circulation device is treated water according to the water level of the water to be treated. In addition, an object is to provide a technique for efficiently transferring sludge.

  The above problems are solved by the present invention. According to the preferable form of the water treatment apparatus which concerns on this invention, the water treatment apparatus which processes with respect to the to-be-processed water containing sludge is comprised. This water treatment device includes an inflow tank, an anaerobic treatment tank, an aerobic treatment tank, a transfer device for discharging treated water for discharging treated water, a first circulation device, and a second circulation device. The treated water that has flowed into the inflow tank is sequentially processed in the anaerobic treatment tank and the aerobic treatment tank. The transfer apparatus for discharging the water to be treated is provided so as to transfer the treated water to be treated. Preferably, the transfer apparatus for discharging the water to be treated is provided so as to discharge the water to be treated which has been subjected to the aerobic treatment in the aerobic treatment tank. In addition, the to-be-processed water discharge | transfer apparatus may be comprised so that the to-be-processed water may be drained directly to the exterior of a water treatment apparatus, and the further treatment tank (for example, disinfection tank in a water treatment apparatus) ) May be configured to drain. A 1st circulation apparatus transfers the to-be-processed water of an anaerobic processing tank to an inflow tank, and circulates to-be-processed water between an inflow tank and an anaerobic processing 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 between 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 water 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. In other words, 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 processing tank, and an aerobic processing tank can be fluctuate | varied between a high water level position and a low water level position.

  As the transfer device for discharging the water to be treated, the first circulation device, and the second circulation device, various pumps such as an air lift pump and a submersible pump are suitably included. Preferably, the transfer amount for transferring the water to be treated is variable according to the water 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 water to be treated, the first circulation device, and the second circulation device, the head varies automatically according to the water level of the water to be treated in the water treatment tank. The amount of treated water transferred is variable. In addition, the structure which makes variable the transfer amount of to-be-processed water by controlling the air quantity supplied to an air lift pump according to the water level of to-be-processed water may be sufficient. Moreover, when using a submersible pump as a to-be-processed water discharge | emission transfer apparatus, the transfer amount of to-be-processed water is made variable by controlling the drive / stop of a submersible pump.

  According to the present invention, since the treated water discharge 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. The water level is changed. Therefore, when the wastewater does not flow into the water treatment apparatus from the outside, the water level of the water to be treated in each tank becomes a low water level due to the discharge of the water to be treated by the transfer apparatus for discharging the water to be treated. In a state where the water level is lowered, by reducing the amount of water to be treated by the first circulation device and the second circulation device, the flow rate in the tank can be lowered and sludge in the water to be treated can be efficiently settled. . And when wastewater flows into the apparatus to be treated from the outside and the water level of the water to be treated rises above the low water level, the transfer amount of the water to be treated by the first circulation device and the second circulation device is increased. Thus, the transfer amount of sludge can be increased 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 at least one of the first circulation device and the second circulation device, a device for controlling the amount of transfer by the air lift pump is provided by utilizing the variation in the stroke of the air lift pump accompanying the variation in the water level. However, when the water level rises, the transfer amount of the water to be treated and 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 | capacitance of each tank in a water treatment apparatus can be made small. Therefore, the enlargement of the water treatment device can be suppressed.

  According to the further form of the water treatment apparatus which concerns on this invention, while the to-be-processed water is transferred by a downward flow, the anaerobic filter medium for anaerobically treating the to-be-processed water is arrange | positioned. The first chamber is provided on the downstream side of the first chamber, and the second chamber is configured to transfer the water to be treated by upward flow. The aerobic treatment tank has a third chamber in which the water to be treated is transferred by a downward flow and an aerobic filter medium for aerobic treatment of the water to be treated is disposed on the downstream side of the third chamber. And a fourth chamber in which water to be treated is transferred by upward flow.

  According to this form, to-be-processed water is transferred by a downward flow, and is processed with an anaerobic filter medium or an aerobic filter medium. Therefore, sludge tends to settle after anaerobic treatment or aerobic treatment. Preferably, the first circulation device and the second circulation device have intake ports at positions close to the bottoms of the anaerobic treatment tank and the aerobic treatment tank, respectively, so as to transfer the sludge precipitated together with the water to be treated to the inflow tank. Provided. Thereby, the settled sludge can be efficiently transferred to the inflow tank by the first circulation device and 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 further form of the water treatment apparatus which concerns on this invention, the aerobic filter medium is comprised as a fixed filter bed fixed to the water treatment apparatus. The fixed filter bed is fixed so as not to flow when the water to be treated is aerobically 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 the wall surface. 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 easily settle. Note that all of the aerobic filter media may be configured as fixed filter media, or a portion of the filter media may be fixed and other filter media may be configured as flowable filter media.

  According to the further form of the water treatment apparatus which concerns on this invention, the to-be-treated water of an inflow tank, an anaerobic treatment tank, and an aerobic treatment tank by the position of the lower end part of the water inlet of the transfer apparatus for to-be-processed water discharge | disconnection in a perpendicular direction The low water level position for the water level is defined. Preferably, the lower end portion of the communication hole communicating the anaerobic treatment tank and the aerobic treatment tank is set at a position lower than the lower end portion of the water inlet of the treated water discharge transfer device, and the upper end portion of the communication hole 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 communicates the anaerobic treatment tank and the aerobic treatment tank. Thereby, when the water level of the to-be-processed water of an inflow tank, an anaerobic processing tank, and an aerobic processing tank is a low water level position, to-be-processed water is circulated between an anaerobic processing tank and an aerobic processing tank through a communicating hole. . Therefore, the sludge that has flowed out from the anaerobic treatment tank to the downstream aerobic treatment tank or part of the sludge generated during the aerobic treatment process can be returned to the anaerobic treatment tank. Therefore, it is suppressed that sludge accumulates in an aerobic processing tank and the aerobic processing performance of to-be-processed water deteriorates.

  According to the present invention, in a water treatment apparatus including a circulation device that circulates water to be treated and transfers sludge, the circulation device efficiently transfers sludge together with the water to be treated according to the water level of the water to be treated. Technology is provided.

It is a figure which shows the outline | summary of the water treatment apparatus which concerns on 1st Embodiment of this invention. It is a figure which shows the process 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. It is sectional drawing in the IV-IV line of FIG. It is sectional drawing in the VV line of FIG. It is sectional drawing in the VI-VI line of FIG. It is sectional drawing which shows the detail of a 3rd air lift pump. It is a figure which shows the outline | summary of the water treatment apparatus which concerns on 2nd Embodiment of this invention. It is a figure which shows the process flow of the to-be-processed water in a water treatment apparatus.

  The structure of the water treatment apparatus in 1st Embodiment of this invention is demonstrated with reference to FIGS. The embodiment of the present invention describes a water treatment apparatus that receives raw water (also referred to as “drainage” or “treated water”) discharged from ordinary households, apartment houses, etc. in a water treatment area and treats it. is there.

  As shown in FIG. 1, the water treatment embedding apparatus 100 includes a tank-shaped treatment tank main body 101 that constitutes a casing (outer shell) of the water treatment embedding apparatus 100. As shown in FIGS. 1 and 2, the processing tank body 101 is formed in a substantially rectangular shape in plan view, and includes side walls 101a and 101b parallel to each other, side walls 101c and 101d parallel to each other, 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 sewage) together with manure.

  As shown in FIG. 1, 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 the 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 leading the treated water from the internal space of the treatment tank body 101. The manhole portion 104 is configured as a portion where manholes for tank entry, internal inspection, and cleaning are formed.

  In addition, the manhole part 104 side (upper wall 101f side) of the treatment tank body 101 is defined as the tank upper part or the 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. The Further, the inflow pipe 102 side (side wall 101c side) of the processing tank main body 101 is defined as the upstream side, and the outflow pipe 103 side (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 the horizontal direction (also referred to as the tank front-rear direction), and the direction intersecting the horizontal direction is defined as the vertical direction (also referred to as the tank vertical direction). The Also, a direction perpendicular to the paper surface of FIG. 1 (a tank front-rear direction and a direction perpendicular to the tank vertical direction, the vertical direction in FIG. 3) is defined as the tank left-right direction. In addition, the arrow in FIGS. 1-7 has shown the flow of to-be-processed water.

  As shown in FIG. 1, a water treatment region in which a 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 precipitation separation tank 120, a cleaning hole 130, an anaerobic treatment tank 140, an aerobic treatment tank 150, a treated water tank 160, and a disinfection tank 170 are formed. As shown in FIG. 2, the waste water flowing into the treatment tank main body 101 (inflow baffle 110) through the inflow pipe 102 is discharged into the precipitation separation tank 120, the anaerobic treatment tank 140, the aerobic treatment tank 150, the treated water tank 160 and the disinfection tank 170. The treated water is sequentially filled and the treated water flows out of the treatment tank body 101 through the outflow pipe 103. Moreover, it is comprised so that to-be-processed water may circulate between the precipitation separation tank 120 and the cleaning hole 130, and between the anaerobic processing tank 140 and the aerobic processing tank 150. FIG. 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 is used as toilet or water for watering. You may comprise as a water reuse apparatus to reuse.

  The inflow baffle 110 constitutes the most upstream area of the water treatment area. Waste water that has flowed into the inflow baffle 110 from the inflow pipe 102 is transferred to the sedimentation separation tank 120. The treated water that has flowed into the precipitation separation tank 120 is subjected to solid-liquid separation treatment, and the solid components separated from the treated water are deposited on the bottom of the precipitation separation tank 120 as precipitation sludge. As the wastewater flows into the inflow baffle 110, the wastewater indirectly flows into the precipitation separation tank 120, and stirring of the sludge that has settled in the precipitation separation tank 120 is suppressed. The sedimentation separation tank 120 provided with this inflow baffle 110 is an implementation structural example corresponding to the "inflow tank" in this invention.

  As shown in FIGS. 1 and 3, a partition wall 105 extending in the vertical direction of the tank is provided between the precipitation separation tank 120 and the anaerobic treatment tank 140 on the downstream side. The partition wall 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 the precipitation separation tank 120 and the anaerobic treatment tank 140 are formed in the upper region of the partition wall 105. As shown in FIGS. 3 and 4, a partition wall 131 for partitioning the precipitation 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 left-right direction of the tank, and is provided apart from the side walls 101c and 101d in the front-rear direction of the tank. The partition wall 131 sets the cleaning hole 130 in the central region of the partition wall 105 in the tank left-right direction. With respect to the cleaning hole 130, the openings 105 a and 105 b are provided on the left and right sides of the cleaning hole 130, respectively.

  As shown in FIG. 1 and FIG. 4, the lower end portion of the partition wall 131 is disposed so as to be separated from the bottom portion (bottom wall 101 e) of the processing tank main body 101, whereby the lower region of the precipitation separation tank 120 is It communicates with the cleaning hole 130. That is, the lower end portion 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 spaced 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 spaced downward from the upper wall 101f. The cleaning hole 130 is provided with a long and mesh-shaped filter medium 132 formed as a draft tube and a first air diffuser 190 penetrating the filter medium 132. As shown in FIG. 4, the first air diffuser 190 is disposed in the right region of the cleaning hole 130. When air is supplied into the cleaning hole 130 from the lower end portion of the first air diffuser 190 through the lower end opening 130 a, an upward flow is generated in the region on the right side of the cleaning hole 130, and the region on the left side of the cleaning hole 130. A downward flow is generated at. Thereby, a swirl flow is generated in the cleaning hole 130 and the water to be treated in the cleaning hole 130 is agitated. 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 accumulated at the bottom of the sedimentation separation tank 120 circulates in the cleaning hole 130 together with the water to be treated by a swirling flow (upward flow and downward flow). In the cleaning hole 130, the sludge is aerobically treated efficiently by the fragmented air. Due to the fluctuation of the water level in the water treatment region, the sludge in the cleaning hole 130 and the sludge at the bottom of the precipitation separation tank 120 come and go, and thereby the sludge containing bubbles is supplied into the precipitation separation tank 120. As a result, in the sedimentation separation tank 120, sludge containing bubbles rises and scums, and the sludge is stored at a high concentration.

  As shown in FIG. 3, the water to be treated in the precipitation separation tank 120 is transferred to the anaerobic treatment tank 140 on the downstream side through the left and right openings 105a and 105b. This anaerobic treatment tank 140 is an implementation configuration example 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. A partition wall 106 extending in the vertical direction of the tank is provided between the anaerobic processing tank 140 and the aerobic processing chamber 150 on the downstream side. 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 as shown in FIG. By the 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 portion of the partition wall 143 is disposed so as to be separated from the bottom portion of the processing tank body 101, whereby the lower region of the first anaerobic chamber 141 communicates with the second anaerobic chamber 142. doing. The first anaerobic chamber 141 and the second anaerobic chamber 142 are implementation configuration examples corresponding to the “first chamber” and the “second chamber” in the present invention, respectively.

  Further, as shown in FIG. 3, a partition wall 161 for partitioning a region downstream of the partition wall 106 into an aerobic treatment tank 150 and a treated water tank 160 is attached to the rear side (downstream side) of the partition wall 106. Yes. The length of the second anaerobic chamber 142 partitioned by the partition wall 143 in the horizontal direction of the tank is set to be longer than the length of the treated water tank 160 partitioned by the partition wall 161 in the horizontal direction of the tank. As a result, as shown in FIGS. 3, 5, and 6, in the partition wall 106, the outside of the partition wall 161 (the outside of the treated water tank 160) and the inside of the partition wall 143 (second) in the horizontal direction of the tank. On the inner side of the anaerobic chamber 142, left and right openings 106 a and 106 b communicating with the second anaerobic chamber 142 and the aerobic treatment tank 150 are provided. The openings 106a and 106b are an implementation configuration example corresponding to the “communication hole” in the present invention.

  The partition wall 106 is assembled to the processing tank main body 101 in a state in which the partition wall 143 and the partition wall 161 are attached to the partition wall 106 in advance. That is, the partition 106, the partition wall 143, and the partition wall 161 are comprised as an assembly body. 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 efficiently and simply installed.

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

  The water to be treated that has been anaerobically treated in the first anaerobic chamber 141 is transferred from the lower region of the first anaerobic chamber 141 to the lower region of the second anaerobic chamber 142 by the downward flow generated in the first anaerobic chamber 141, and the second The inside of the anaerobic chamber 142 is raised. That is, an upward flow is generated in the second anaerobic chamber 142. Thereafter, the water to be treated passes from the upper region of the second anaerobic chamber 142 to the aerobic treatment tank 150 through the opening 106a (or the opening 106b).

  A first air lift pump 180 is installed in the second anaerobic chamber 142. In the second anaerobic chamber 142, the sludge transferred from the first anaerobic chamber 141 accumulates, and SS and sludge naturally returned from the aerobic treatment tank 150 settle through the opening 106. The first air lift pump 180 returns the sludge deposited and transferred from the first anaerobic chamber 141 and the SS and sludge naturally returned from the aerobic treatment tank 150 together with the water to be treated to the inflow baffle 110. The first air lift pump 180 is provided in a 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 a function of anaerobically treating the treated water flowing into the anaerobic treatment tank 140 as a downward flow in the first anaerobic chamber 141, and the first air lift pump 180 in the anaerobic filter bed 144. It has the function of isolating from This 1st air lift pump 180 is the implementation structural example corresponding to the "1st circulation apparatus" in this invention.

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

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

  As shown in FIG. 6, the aerobic treatment tank 150 is provided with a second air diffuser 191. Thereby, the to-be-processed water which passes the aerobic filter bed 151 is aerobically processed by the air supplied from the 2nd diffuser pipe 191. The water to be treated that has been aerobically treated by the aerobic filter beds 151 a and 151 b is transferred to the lower region of the aerobic treatment tank 150.

  As shown in FIGS. 1 and 6, the treated water tank 160 is provided with a second air lift pump 181. The second air lift pump 181 extends to the lower region of the treated water tank 160. Thereby, 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 to-be-processed water in the water treatment apparatus 100 circulates in the inflow baffle 110, the precipitation separation tank 120, the anaerobic treatment tank 140, and the aerobic treatment tank 150. The aerobic treatment tank 150 and the treated water tank 160 are an implementation configuration example corresponding to the “aerobic treatment tank” in the present invention. In addition, the aerobic treatment tank 150 and the treated water tank 160 are implementation configuration examples corresponding to the “third chamber” and the “fourth chamber” in the present invention, respectively. Moreover, the 2nd air lift pump 181 is the implementation structural example corresponding to the "2nd circulation apparatus" in this 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 treated water tank 160 is provided with a third air lift pump 182 for transferring the treated water in the treated water tank 160 to the disinfection tank 170. This 3rd air lift pump 182 is the implementation structural example corresponding to the "transfer apparatus for to-be-processed water discharge" in this invention.

  As shown in FIG. 7, the third air lift pump 182 is mainly composed of a pump housing 183 and a partition 187. The pump housing 183 is a bottomed cylindrical member extending in a long shape in the vertical direction. 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 portion that sucks water to be treated into the pump housing 183. As shown in FIG. 1, the suction port 184 sets the low water level (LWL) position of the treated water tank 160 by the suction port 184 when the third air lift pump 182 is installed in the treated water tank 160. This suction port 184 is an implementation configuration example corresponding to the “water intake port” in the present invention.

  The air supply port 185 is connected to air supply means (not shown). As a result, air is supplied into the pump housing 183 via the air supply port 185. The air supply port 185 is provided below the suction port 184 in the vertical direction. The discharge port 186 is configured as an opening for discharging the water to be treated that has flowed through 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 intermediate partition 187 is a flat partition member that extends along the extending direction (vertical direction) of the pump housing 183. By this partition part 187, the space in the pump housing 183 is partitioned into a first flow path 183a and a second flow path 183b. The first flow path 183a constitutes a flow path closer to the suction port 184 than the partition 187. The second flow passage 184b constitutes a flow path on the discharge port 186 and air supply port 185 side from the partition 187. The middle partition portion 187 is formed integrally with a lid portion that closes the upper portion 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 path 183b due to the air flow rising upward in the second flow path 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 through 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 sterilized by the disinfectant eluted from the medicine cylinder is discharged to the outside of the treatment tank body 101 through the outflow pipe 103. Further, another tank such as 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 air supply and cutoff 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 this 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. Further, 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 implementation configuration example corresponding to the “low water level position” in the present invention. 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 apparatus 100 from the inflow pipe 102, the water level in the precipitation separation tank 120 rises. As the water level rises, the anaerobic treatment tank 140, the aerobic treatment tank 150, and the treated water tank 160 communicated with the precipitation 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 precipitation separation tank 120, the anaerobic treatment tank 140, the aerobic treatment tank 150, and the treated water tank 160 is at the same water level. In these tanks, the water level fluctuates 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 treated water is higher than the low water level, the third air lift pump 182 transfers the treated water in the treated 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 that has been treated in the disinfection tank 170 flows out of the treatment tank main body 101. By the transfer of the water to be treated by the third air lift pump 182, the water level of the water to be treated in the precipitation separation tank 120, the anaerobic treatment tank 140, the aerobic treatment tank 150 and the treatment water tank 160 is lowered to the low water level. When the level of the water to be treated becomes a 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 blocked. For example, by setting the transfer capability by 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 capability of the third air lift pump 182 is set so as to change from a high water level to a 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 for increasing the amount of transferred water of the first air lift pump 180 and the second air lift pump 181 from becoming unnecessarily long, and sludge settles in the tank. The situation can be made easy.

  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 bottoms of the anaerobic treatment tank 140 and the aerobic treatment tank 150. Therefore, the first air lift pump 180 and the second air lift pump 181 always return the sludge together with the water to be treated to the inflow baffle 110. Therefore, the water to be treated circulates in the sedimentation separation tank 120, the anaerobic treatment tank 140, the aerobic treatment tank 150, and the treatment water tank 160 even while the water level of the water to be treated fluctuates between the low water level and the high water level. To do. Thereby, to-be-processed water is processed efficiently in each processing tank. Therefore, the water treatment apparatus 100 capable of increasing the efficiency related to the treatment of the water to be treated is configured, and therefore the capacity of each tank can be reduced. Therefore, the enlargement of the water treatment apparatus 100 is suppressed. Moreover, the sludge can be efficiently returned to the inflow baffle 110 (precipitation separation tank 120).

  The heads of the first to third air lift pumps 180 to 182 vary with the fluctuation of the water level in the water treatment region. That is, when the water level of the water to be treated in the water treatment region becomes high, the head becomes short and the amount of water to be treated by the air lift pump increases. On the other hand, when the water level of the water to be treated in the water treatment region becomes low, the lift becomes long and the amount of water to be treated by the air lift pump decreases. Therefore, by using the air lift pump, when the amount of waste water 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 according to 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 high water level is 3 to 6 times the transfer amount of the first air lift pump 180 and the second air lift pump 181 at the low water level. It is preferable to set the dimensions and the like of the flow passages in each air lift pump so as to be approximately. Accordingly, the 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 above 1st Embodiment, in the water treatment apparatus 100, it arrange | positions so that the cleaning hole 130 may be enclosed by the precipitation separation tank 120 by planar view. Therefore, communication between the precipitation 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-rear direction of the processing tank main body 101. Thereby, the to-be-processed water distribute | circulates efficiently between the precipitation separation tank 120 and the cleaning hole 130. FIG.

  In addition, according to the first embodiment, the air supplied from the first air diffuser 190 generates a swirling flow in the water to be treated in the cleaning hole 130, and the precipitation separation tank is generated by the flow of the water to be treated by the swirling flow. The treated water is circulated efficiently between 120 and the cleaning hole 130.

  In addition, 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 that circulates in the cleaning hole 130 is effectively reduced by fine bubbles. Can be aerobic. Moreover, by supplying the sludge containing fine bubbles to the sedimentation separation tank 120, it is possible to promote scumming in the precipitation separation tank 120 and store the sludge at a high concentration.

  Moreover, according to 1st Embodiment, the to-be-processed water returned to the inflow baffle 110 by the 1st air lift pump 180 and the 2nd air lift pump 181 can improve the denitrification performance in the anaerobic filter bed 144. FIG. 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 treated water returned to the water has little DO. Therefore, it is possible to suppress an increase in DO to be treated returned into the inflow baffle 110. As a result, the decrease in the denitrification performance of the anaerobic filter bed 144 is suppressed by the water to be treated which is then transferred to the anaerobic treatment tank 140 again.

  Next, the structure of the water treatment apparatus in 2nd Embodiment of this invention is demonstrated with reference to FIG. 8 and FIG. 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. In the second embodiment, similarly to the first embodiment, the water to be treated by the first air lift pump 180 and the second air lift pump 181 is the precipitation separation tank 120, the anaerobic treatment tank 140, the aerobic treatment tank 150, and the treated water tank. Cycle 160. Since the sludge is efficiently returned to the sedimentation separation tank 120, when the capacity of the precipitation separation tank 120 is sufficiently large to separate the sludge from the water to be treated and precipitate it, the cleaning hole 130 and the first dust dispersion tank 120 are used. The trachea 190 may not be provided.

  In each of the above embodiments, the water treatment apparatus 100 is provided with the air lift pump, but a submersible pump other than the air lift pump may be installed. 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.

  Moreover, in the above embodiment, the water treatment apparatus 100 has each treatment element of the inflow baffle 110, the sedimentation separation tank 120, the cleaning hole 130, the anaerobic treatment tank 140, the aerobic treatment tank 150, the treated water tank 160, and the disinfection tank 170. However, 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 that treats raw water discharged from a general household, an apartment house, etc. has been described. However, the present invention is not limited to an ordinary household, an apartment house, but a commercial facility, a public facility. The present invention can also be applied to a water treatment apparatus that treats raw water discharged from facilities such as factories.

(Correspondence between each component of the embodiment and each component of the present invention)
The above embodiment shows an example for carrying out the present invention. Therefore, the present invention is not limited to the configuration of the embodiment. The correspondence relationship between each component of the embodiment and each component of the present invention is shown below.
The water treatment apparatus 100 is an example of a configuration corresponding to the “water treatment apparatus” 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 treated water tank 160 is an example of a configuration corresponding to the “aerobic treatment tank” of the present invention.
The treated 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 apparatus 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.

DESCRIPTION OF SYMBOLS 100 Water treatment apparatus 101 Processing tank main body 101a Side wall 101b Side wall 101c Side wall 101d Side wall 101e Bottom wall 101f Top wall 102 Inflow pipe 103 Outflow pipe 104 Manhole part 105 Partition 105a Opening part 105b Opening part 106 Partitioning part 106a Opening part 106b Opening part 110 Inflow baffle 120 Precipitation 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 Treated 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 passage 183b Second flow passage 184 Suction port 185 Air supply Port 186 Discharge port 187 Partition part 190 First air diffuser 191 Second air diffuser

Claims (6)

A water treatment apparatus for treating the water to be treated containing sludge,
An inflow tank into which treated water flows,
An anaerobic treatment tank provided on the downstream side of the inflow tank and anaerobically treating the water to be treated;
An aerobic treatment tank provided on the downstream side of the anaerobic treatment tank for aerobically treating the water to be treated;
In order to discharge treated water to the outside of the water treatment apparatus, a transfer apparatus for discharging the water to be treated for transferring the water to be treated;
A first circulation device for transferring the treated water of the anaerobic treatment tank to the inflow tank and circulating the treated water;
A second circulation device for transferring the water to be treated in the aerobic treatment tank to the inflow tank and circulating the water to be treated;
The water treatment apparatus is configured such that the water levels of the water to be treated 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 anaerobic treatment tank is provided on the downstream side of the first chamber in which the water to be treated is transferred by a downward flow and an anaerobic filter medium for anaerobically treating the water to be treated is disposed. And a second chamber in which water to be treated is transferred by upward flow,
The aerobic treatment tank has a third chamber in which water to be treated is transferred by a downward flow and an aerobic filter medium for aerobically treating the water to be treated is disposed, and a downstream side of the third chamber. A water treatment apparatus comprising: a fourth chamber in which water to be treated is transferred by upward flow. The water treatment device according to claim 2,
The aerobic filter medium is configured as a fixed filter bed fixed to the water treatment apparatus. The water treatment device according to claim 3,
The aerobic filter medium is configured as a three-dimensional network, and is a water treatment device. The water treatment apparatus according to any one of claims 1 to 4,
The position of the lower end of the water intake port of the treated discharge transfer device in the vertical direction defines a low water level position relating to the treated water level of the inflow tank, the anaerobic treatment tank, and the aerobic treatment tank. A water treatment device characterized. The water treatment device according to claim 5,
The lower end portion of the communication hole that communicates the anaerobic treatment tank and the aerobic treatment tank is set at a position lower than the lower end portion of the water intake port of the treated water discharge transfer device, and the upper end portion of the communication hole is A water treatment apparatus, wherein the water treatment apparatus is set at a position higher than a lower end portion of a water intake port of the apparatus for discharging treated water, whereby a low water level position is set in an intermediate region of the communication hole.

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