JP2014226608A - Wastewater treatment apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a membrane treatment device which can be easily miniaturized and installed.SOLUTION: A wastewater treatment apparatus includes a membrane treatment tank 31 into which wastewater flows. Membrane treatment means 32 which purifies the wastewater is installed in the membrane treatment tank 31. The membrane treatment means 32 includes a membrane treatment unit 36 which separates the wastewater into sludge and treated water, and a pump device 37 which operates the drive of the membrane treatment unit 36. The membrane treatment unit 36 includes a submerged membranes 43 which are installed so as to be immersed into the wastewater and can separate the sludge from the wastewater. The pump device 37 includes a pump body 47 which can be driven in the wastewater, and a float switch 51 which operates the drive of the pump body 47. The float switch 51 includes float bodies 54, 55 which can be raised by the wastewater. The float switch 51 detects the water level of the wastewater in the membrane treatment tank 31 by the float bodies 54, 55 to operate the drive of the pump body 47 based on the detection result.

Description

  The present invention relates to a membrane treatment apparatus and a wastewater treatment apparatus for separating sludge by treating a wastewater with a membrane separation activated sludge.

  Conventionally, as a technique for treating wastewater such as domestic wastewater and industrial wastewater, a technique including a solid-liquid separation device, a membrane separation activated sludge treatment device, and a disinfection tank is known as disclosed in Patent Document 1, for example. It has been.

  In the structure of this patent document 1, after separating the contaminants contained in waste water with a solid-liquid separator, the sludge is separated by membrane treatment while treating the activated sludge with the activated sludge treatment device, and the treated water is discharged.

  For the membrane treatment, a membrane module using a submerged membrane such as a hollow fiber type or a plate type that can capture fine particles, bacteria, and the like is used. The operation of the membrane module is switched by a float switch provided in the septic tank.

JP 2007-283170 A

  In membrane separation activated sludge treatment using a membrane treatment means such as a membrane module as in Patent Document 1, in order to stably carry out the membrane separation activated sludge treatment, the membrane treatment means is always immersed in the membrane treatment tank. It is necessary to keep the water level.

  That is, if the membrane such as the submerged membrane used in the membrane module is dried or if the sludge concentration becomes too high, the filtration capacity is significantly reduced. It is necessary to operate so as to stop the supply of the separation liquid in order to prevent overflow when the supply is started and the water level becomes high.

  Therefore, normally, in addition to a pump such as a blower, a detection means for detecting the water level in the membrane treatment tank and an operation means such as an operation panel for switching the driving of the pump based on the detection result of the detection means are provided.

  As a result, it is necessary to secure an installation space for pumps and operation means outside the membrane treatment tank, and it is difficult to reduce the size as equipment, for example, for home use, where installation space is limited and complicated installation work is not preferred It becomes difficult to apply.

  Therefore, there has been a demand for a facility that can be easily downsized and can be easily installed.

  This invention is made | formed in view of such a point, and it aims at providing the membrane processing apparatus and waste water treatment apparatus which are easy to reduce in size and can be installed easily.

  The membrane treatment apparatus according to claim 1 comprises a membrane treatment tank into which wastewater flows, and a membrane treatment means installed in the membrane treatment tank for purifying the wastewater, wherein the membrane treatment means comprises the wastewater A membrane treatment unit for separating sludge and treated water, and a pump device for operating the membrane treatment unit. The membrane treatment unit is installed so as to be immersed in the wastewater, and the sludge is removed from the wastewater. The pump device has a pump body that can be driven in the waste water, and a float switch that operates to drive the pump body, and the float switch The float body is capable of floating, and the float body detects the water level of the waste water in the membrane treatment tank, and operates the pump body based on the detection result.

  The membrane treatment apparatus according to claim 2 is the membrane treatment apparatus according to claim 1, wherein the pump device includes a suction pipe that sucks the treated water from the membrane treatment unit, and a discharge pipe that discharges the treated water. And the pump body is located at a height higher than the upper end of the membrane processing unit, and the discharge pipe is located above the suction pipe.

  A wastewater treatment apparatus according to a third aspect includes a solid-liquid separation apparatus that separates impurities from the wastewater, and a membrane treatment apparatus according to the first or second aspect. The separated waste water is supplied to the membrane treatment apparatus.

  The waste water treatment apparatus according to claim 4 is the waste water treatment apparatus according to claim 3, wherein the solid-liquid separation device is installed in the solid-liquid separation tank into which the waste water flows and the solid-liquid separation tank. A solid-liquid separation means for separating impurities from the cylinder, and the solid-liquid separation means is formed in a cylindrical shape in which a plurality of liquid passage holes through which the impurities cannot pass are formed and inclined in the solid-liquid separation tank The screen, aeration means for blowing aeration gas to the screen, and transfer means for transferring the separation liquid in the screen that has passed through the liquid passage hole.

  The waste water treatment apparatus according to claim 5 is the waste water treatment apparatus according to claim 4, wherein the aeration means has an air diffuser installed in the screen to diffuse the aeration gas, and the transfer means is the screen. There is a transfer pipe for transferring the separated liquid, and the diffuser pipe and the transfer pipe are installed in the screen.

  The waste water treatment apparatus according to claim 6 is the waste water treatment apparatus according to claim 4 or 5, wherein the transfer means has a transfer pipe installed in the screen for transferring the separation liquid in the screen. The tube is provided with a blowing port through which a transfer gas is blown, and the transfer gas is blown from the blowing port, so that the separation liquid in the screen moves in the transfer tube, and the above-mentioned in the solid-liquid separation tank The water level in the solid-liquid separation tank is controlled by adjusting the positions of the transfer pipe and the blowing port.

  According to the present invention, the pump device has a pump body that can be driven in waste water, and a float switch that detects the water level of the waste water in the membrane treatment tank by the float body and operates the drive of the pump body. The entire membrane treatment means can be installed in the membrane treatment tank, and can be easily miniaturized and installed easily.

It is a block diagram which shows the waste water treatment apparatus which concerns on one embodiment of this invention. It is a perspective view which shows the structure of the screen in the solid-liquid separator of a waste-water-treatment apparatus same as the above. It is a block diagram which shows the modification of the solid-liquid separator in a waste-water-treatment apparatus same as the above.

  Hereinafter, the configuration of an embodiment of the present invention will be described with reference to FIG.

  In FIG. 1, reference numeral 1 denotes a wastewater treatment apparatus. The wastewater treatment apparatus 1 is embedded in the ground and purifies wastewater such as domestic wastewater and industrial wastewater.

  The waste water treatment device 1 includes a solid-liquid separation device 2 that separates impurities from waste water. The solid-liquid separation device 2 is supplied with a separation liquid which is waste water from which impurities are separated by the solid-liquid separation device 2, and a membrane treatment device 3 for purifying the separation liquid by membrane separation activated sludge treatment. 4 and adjacent to each other via 4.

  The solid-liquid separation device 2 has a solid-liquid separation tank 5 having a hollow inside, and in this solid-liquid separation tank 5, solid-liquid separation means 6 for solid-liquid separation of waste water into impurities and separated liquid is installed. Has been.

  The solid-liquid separation tank 5 has a drainage inlet 7 to which a drainage inflow pipe (not shown) is connected, and drainage flows from the drainage inlet 7 and is stored.

  In addition, an upper opening 8 is provided at the upper part of the solid-liquid separation tank 5 and is almost at the same height as the ground. A lid 9 such as a manhole is detachably installed in the upper opening 8. ing. The upper opening 8 is normally closed with a lid 9 and is opened when the lid 9 is removed, for example, during maintenance.

  Further, the partition 4 is provided with a supply port 10, and the separation liquid from the solid-liquid separation device 2 is supplied to the membrane processing device 3 through the supply port 10.

  The solid-liquid separation means 6 includes a cylindrical screen 11 installed in the solid-liquid separation tank 5, aeration means 12 for blowing aeration gas to the screen 11, and transfer means 13 for transferring the separation liquid in the screen 11. And have.

  As shown in FIG. 2, the screen 11 is formed in a square tube shape with four flat side surfaces 14, a bottomed square tube whose lower end portion is closed by a bottom surface portion 15 and whose upper end portion is opened. Is.

  The screen 11 is inclined in the solid-liquid separation tank 5 so that the upper end portion is located on the drainage inlet 7 side and the bottom portion 15 is located on the partition 4 side opposite to the drainage inlet 7. is set up.

  A plurality of liquid passage holes 16 are provided in the side surface portion 14 of the screen 11. These liquid passage holes 16 have such a size and shape that impurities such as fibrous substances such as hair cannot pass through the drainage, and the drainage liquid can pass through, for example, a circular shape having a diameter of 3 mm. .

  When the wastewater stored in the solid-liquid separation tank 5 flows into the screen 11 from the four side surface parts 14, impurities that cannot pass through the liquid passage holes 16 are separated, and the liquid component passes through the liquid passage holes 16. Passes through the screen 11. In general, the amount of waste water that passes through the screen 11 is set to be larger than the amount of separation liquid to be processed by the membrane processing apparatus 3.

  The size and shape of the liquid passage hole 16 in the screen 11 can be designed as appropriate according to the type of wastewater to be treated and the impurities to be separated.

  The aeration means 12 has an aeration tube 17 installed in the screen 11. An aeration gas supply unit 18 connected to a blower (not shown) is provided at the upper end of the air diffuser 17. Further, an aeration gas discharge port 19 is provided at the lower end of the air diffuser 17.

  Then, the aeration gas from the blower is supplied from the aeration gas supply unit 18 to the diffuser pipe 17 and discharged from the aeration gas discharge port 19, thereby rising along the side surface portion 14 of the inclined screen 11. .

  Further, there is a possibility that impurities are attached to the side surface portion 14 of the screen 11, and the aeration gas rises along the side surface portion 14 of the screen 11, thereby removing the impurities from the side surface portion 14. The removed impurities are precipitated as they are and deposited on the bottom of the solid-liquid separation tank 5.

  Note that the inclination angle of the screen 11 and the aeration amount of the aeration means 12 can be appropriately adjusted according to the impurities to be removed.

  The transfer means 13 has a transfer pipe 21 that transfers the separation liquid in the screen 11. The transfer pipe 21 is installed in the screen 11.

  A separation liquid supply unit 22 that supplies the separation liquid transferred through the transfer pipe 21 to the membrane processing apparatus 3 is provided at the upper end of the transfer pipe 21. The separation liquid supply unit 22 includes a connection part 23 communicating with the transfer pipe 21 and a separation liquid supply pipe 24 connected from the connection part 23 to the supply port 10.

  The lower end of the transfer pipe 21 is provided with a suction port 25 that is opened in an elliptical shape so that the transfer pipe 21 is cut in an inclined manner. Further, in the vicinity of the suction port 25, for example, a blow port 26 opened in a circular shape is formed.

  An air lift gas supply pipe 27 having a slightly smaller diameter than the transfer pipe 21 is installed in the screen 11.

  The air lift gas supply pipe 27 is disposed substantially in parallel with the transfer pipe 21 and has a lower end connected to the blowing port 26. In other words, the air lift gas supply pipe 27 communicates with the transfer pipe 21 via the blowing port 26. In addition, an air lift gas supply unit 28 connected to a blower (not shown) is provided at the upper end of the air lift gas supply pipe 27.

  The air lift gas from the blower is supplied to the air lift gas supply pipe 27 via the air lift gas supply section 28, descends in the air lift gas supply pipe 27, and flows into the transfer pipe 21 from the blowing port 26. The inside of the transfer pipe 21 is raised.

  As described above, the air lift gas is supplied to the transfer pipe 21 and moves up in the transfer pipe 21, whereby the separation liquid in the screen 11 is sucked from the suction port 25 by the air lift action. Further, the separation liquid sucked into the transfer pipe 21 rises together with the air lift gas rising inside the transfer pipe 21 and is supplied from the separation liquid supply unit 22 to the membrane processing apparatus 3 outside the solid-liquid separation tank 5. .

  The membrane treatment apparatus 3 includes a membrane treatment tank 31 having a hollow interior provided integrally with the solid-liquid separation tank 5 via a partition 4. In the membrane treatment tank 31, membrane treatment means 32 for purifying the separated liquid as waste water is installed. Further, the membrane treatment tank 31 is provided with a discharge port 33.

  The separation liquid supplied from the solid-liquid separation device 2 to the membrane treatment device 3 is stored in the membrane treatment tank 31, and after the pollutant is adsorbed and oxidized and decomposed by the activated sludge microorganisms in the sludge, the membrane treatment means. The sludge is filtered and decomposed by 32. That is, since the membrane treatment means 32 also has the function of a sedimentation tank in a normal activated sludge method, sludge is filtered and separated by membrane treatment, so that the sludge does not flow out of the membrane treatment tank 31, and the membrane treatment tank 31 The activated sludge inside is maintained at a high concentration.

  An upper opening 34 located at the same height as the ground is provided in the upper part of the film processing tank 31, and a lid 35 such as a manhole is detachably installed in the upper opening 34. The upper opening 34 is normally closed with a lid 35, and is opened when the lid 35 is removed, for example, during maintenance.

  Membrane treatment means 32 can be driven in water with a membrane treatment unit 36 that biologically treats with activated sludge microorganisms contained in sludge while separating the separation liquid into sludge and treated water while immersed in the separation liquid And a pump device 37 as a submersible pump.

  The film processing unit 36 has a frame 41 formed of, for example, a plastic plate.

  A plurality of cylindrical pipe members 42 are fixed to the frame body 41, and a plurality of submerged membranes 43 such as hollow fibers are connected to and connected to the pipe members 42, for example.

  The submerged membrane 43 is preferably a microfiltration (MF) membrane having a pore size of 0.1 to 0.4 μm and capable of passing pathogens and inorganic or organic contaminants. The submerged membrane 43 is installed so as to be immersed in the separation liquid, the sludge in the separation liquid cannot permeate, the treated water containing pathogens and inorganic or organic contaminants can permeate, and the sludge is removed from the separation liquid. Separate by filtration.

  Each pipe member 42 communicates with and is connected to the collecting pipe 45 through the pipe 44. That is, the collecting pipe 45 communicates with each submerged film 43 via the pipe member 42 and the pipe 44.

  In addition, an air diffuser 46 is installed on the frame body 41 so as to be positioned below the submerged film 43. The air diffuser 46 releases aeration gas toward the submerged film 43. Then, by releasing the aeration gas from the aeration device 46, the biological treatment in the membrane treatment tank 31 proceeds, and the membrane surface of the submerged membrane 43 is washed.

  The pump device 37 has a pump body 47 that can be driven in drainage. That is, the pump device 37 can be driven even when the pump main body 47 is immersed in the waste water. By driving the pump main body 47, a suction force is applied to the film processing unit 36, and the film processing unit 36 is used in the film processing tank 31. The separated liquid is sucked and separated by filtration, and the membrane separation activated sludge treatment proceeds.

  One end of a suction pipe 48 that sucks treated water from the membrane treatment unit 36 and one end of a discharge pipe 49 that discharges treated water sucked by the suction pipe 48 are connected to the pump body 47.

  The other end of the suction pipe 48 is connected to the collecting pipe 45, and the other end of the discharge pipe 49 is connected to the discharge port 33. That is, when the pump body 47 is driven, filtration and separation by the submerged membrane 43 proceeds, and the treated water from which the sludge has been separated is sucked by the suction pipe 48 via the collecting pipe 45 and the pipe member 42. Further, the suctioned treated water is discharged to the discharge port 33 through the discharge pipe 49.

  From the viewpoint of safely draining treated water, it is preferable to connect the discharge pipe 49 to a disinfecting tank (not shown) and disinfect the treated water in this disinfecting tank and then discharge it from the waste water treatment apparatus 1. Specifically, for example, a disinfectant such as a solid chlorine agent is added in the disinfecting tank, or a disinfecting liquid such as a chlorine-based chemical solution is injected into the discharge pipe 49 and is retained in the disinfecting tank for about 15 minutes. It can be disinfected by mixing.

  Here, the pump device 37 is provided with a float switch 51 for operating the drive of the pump body 47.

  The float switch 51 includes an upper switch 52 located on the upper side and a lower switch 53 located on the lower side of the upper switch 52.

  Each of the upper switch 52 and the lower switch 53 has float bodies 54 and 55 that can float by the separation liquid in the membrane treatment tank 31.

  The float switch 51 detects the water level of the separation liquid stored in the membrane treatment tank 31 by the rise and fall of the float bodies 54 and 55 due to the change in the water level of the separation liquid in the membrane treatment tank 31.

  The float switch 51 switches driving of the pump body 47 based on the detection result of the water level by the float bodies 54 and 55. Specifically, when the storage amount (water level) of the separation liquid in the membrane treatment tank 31 exceeds a certain amount and the float bodies 54 and 55 rise together, the pump body 47 is driven to advance the membrane separation activated sludge treatment. . Further, when the separation liquid storage amount (water level) becomes less than a certain amount due to the progress of the membrane separation activated sludge treatment, and both the float bodies 54 and 55 are lowered, the driving of the pump device 37 is stopped.

  In the membrane treatment device 3, the suction side of the submerged membrane 43 and the suction side of the pump main body 47 are immersed in water, and the submerged membrane 43 and the pump main body 47 are installed relatively close to each other. If there is a part where the downstream side is located below the upstream side in the flow path of the processing liquid and descends, when air is sucked in, the air tends to accumulate at the descending part and so-called air biting is likely to occur.

  When the air bite occurs, maintenance is required to remove the air accumulated in the flow path, and the maintenance work is very complicated.

  Therefore, in order to prevent air entrainment, the pump body 37 has a pump body 47 at a height higher than the upper end of the membrane processing unit 36 so that the downstream side is not positioned below the upstream side in the flow path of the processing liquid. It is preferable that the discharge pipe 49 is positioned so as to be located above the suction pipe 48.

  Specifically, the discharge pipe 49 is located above the suction pipe 48, the treated water is sucked into the pump body 47 from the suction pipe 48 in the horizontal direction, and the treated water is discharged from the pump body 47 into the discharge pipe 49 in the horizontal direction. As described above, it is preferable to install the pump main body 47 on the upper portion of the collecting pipe 45. In many cases, the pump body 47 is usually installed so as to be sucked and discharged in the vertical direction. If the installation state is vertical, it is preferably installed sideways.

  The suction pipe 48 and the discharge pipe 49 are preferably piped so that the downstream side is not located below the upstream side.

  When a flexible tubular body such as a hose is used as the suction pipe 48 and the discharge pipe 49, piping may be performed so that a portion that hangs down and falls from the upstream side does not occur due to bending. preferable.

  Next, the operation and effect of the one embodiment will be described.

  When the waste water is treated by the waste water treatment apparatus 1, first, the waste water is supplied from the waste water inlet 7, and the waste water is stored in the solid-liquid separation tank 5.

  The stored wastewater flows so as to flow into the screen 11 from the four side surface portions 14, and is solid-liquid separated by the screen 11 into impurities and a separation liquid.

  Specifically, when drainage flows into the screen 11, impurities in the drainage cannot pass through the liquid passage holes 16 of the side surface portion 14, and only liquid components in the drainage pass through the liquid passage holes 16 of the side surface portion 14. To do. Therefore, the screen 11 separates the contaminants and the separation liquid, and the separation liquid flows into the screen 11.

  The solid-liquid separation tank 5 is not always supplied with the same amount of waste water, and a large amount of waste water may be supplied in a short time. It is preferable to keep it low.

  Here, the separated impurities may adhere to the outside of the screen 11. Therefore, the screen 11 is aerated from the inside by the aeration means 12, and the aeration gas is raised along the inner peripheral surface of the side surface portion 14 of the screen 11, thereby removing impurities adhering to the screen 11. Prevent clogging.

  Further, the separation liquid in the screen 11 rises along the transfer pipe 21 together with the air lift gas by the air lift action by the transfer means 13, and is supplied to the membrane treatment tank 31 via the separation liquid supply unit 22.

  When the float bodies 54 and 55 are both lifted and faced upward due to the rise of the water level of the separation liquid supplied to the membrane treatment tank 31, the float switch 51 is actuated to drive the pump device 37.

  When the pump device 37 is driven, the separation liquid stored in the membrane treatment tank 31 is sucked into the membrane treatment unit 36.

  When the separation liquid is sucked into the membrane treatment unit 36, sludge and fine particles cannot pass through the submerged membrane 43, and the sludge is separated and only treated water flows through the submerged membrane 43 and flows in.

  In addition, the biological treatment by the activated sludge microorganisms contained in the sludge proceeds due to the air diffused by the air diffuser 46, and the sludge and fine particles attached to the outside of the submerged film 43 are removed.

  Furthermore, when the sludge removed by aeration flows along the film surface of the submerged film 43, the film surface is physically washed by the flowing sludge, and the submerged film 43 is prevented from being blocked. .

  The removed sludge is precipitated as it is and deposited on the bottom of the membrane treatment tank 31, and acts as a biological treatment sludge in the membrane treatment tank 31.

  The treated water flowing into each submerged membrane 43 collects in the collecting pipe 45 through the pipe member 42 and the pipe 44. Further, it is sucked into the suction pipe 48 as it is, and is discharged out of the waste water treatment apparatus 1 from the discharge port 33 through the discharge pipe 49.

  Here, when the flow rate of the separation liquid from the solid-liquid separation device 2 is small, the water level of the separation liquid in the membrane treatment tank 31 decreases as the filtration separation process by the membrane treatment means 32 proceeds.

  When the water level of the separated liquid becomes lower than that of the float bodies 54 and 55 and both the float bodies 54 and 55 are lowered, the float switch 51 is actuated to stop the driving of the pump device 37 and the membrane separation activated sludge by the membrane treatment means 32 is activated. Processing stops.

  And according to the said waste water treatment apparatus 1, the pump apparatus 37 detects the water level of the separation liquid in the membrane treatment tank 31 with the pump main body 47 which can be driven in a separation liquid, and the float bodies 54 and 55. Since the float switch 51 for operating the drive of the main body 47 is provided, the entire membrane treatment means 32 can be installed in the membrane treatment tank 31. That is, the submerged membrane 43 and the pump main body 47 can be connected and immersed in the separation liquid in the membrane treatment tank 31.

  Therefore, for example, unlike the prior art, there is no need to install a pump or operating means outside the membrane treatment tank 31, and the membrane treatment apparatus 3 can be easily downsized.

  Further, since the entire membrane treatment means 32 can be installed in the membrane treatment tank 31, assembly work and piping work are easy, and the membrane treatment apparatus 3 can be easily and inexpensively installed.

  As a result, it is easy to apply even in applications where installation space is limited and complicated installation work is not preferred, such as home use, and can be installed in various situations.

  The pump device 37 is installed such that the pump body 47 is located at a height higher than the upper end of the membrane processing unit 36, and the discharge pipe 49 is located above the suction pipe 48, so that the separation liquid in the pump body 47 is Since the air hardly accumulates in the flow path of the air and can prevent air biting, the membrane separation activated sludge treatment can proceed smoothly.

  In addition, the suction pipe 48 and the discharge pipe 49 are piped so that the downstream side is not positioned below the upstream side, so that it is difficult for air to accumulate in the pipe path, preventing air biting. You can proceed to.

  Since the solid-liquid separation means 6 has the cylindrical screen 11 installed in an inclined manner in the solid-liquid separation tank 5, for example, a water contact area of the same level even if smaller than a flat screen such as the above-mentioned Patent Document 2. It is not necessary to partition the solid-liquid separation tank 5.

  Therefore, the installation state of the screen 11 is hardly influenced by the shape of the solid-liquid separation tank 5, and the installation state of the screen 11 in the solid-liquid separation tank 5 can be easily adjusted.

  As a result, the screen 11 is easy to maintain. In addition, regardless of installation problems, it is easy to install the screen 11 appropriately according to the shape of the solid-liquid separation tank 5, the amount of drainage, and the type of drainage from the viewpoint of processing capacity, and the solid-liquid separation device 2 is downsized. it can.

  In particular, since the screen 11 has a rectangular cylindrical shape, the orientation of the screen 11 can be easily adjusted, and the positioning in the solid-liquid separation tank 5 is easy, so that maintenance and the like are easy.

  Further, by disposing the diffuser pipe 17 and the transfer pipe 21 in the screen 11, the solid-liquid separation means 6 can be reduced in size and handled easily.

  Further, the transfer pipe 21 adjusts the amount of wastewater stored in the solid-liquid separation tank 5 by adopting a configuration in which the separation liquid is transferred by a so-called air lift action when the transfer gas is blown from the blowing port 26. Cheap.

  In the above-described embodiment, the solid-liquid separation device 2 that separates the waste water by the screen 11 and the membrane treatment device 3 are provided. However, the present invention is not limited to such a configuration, and the membrane treatment is performed. The device 3 may be configured to be used together with a solid-liquid separation device that separates impurities by means other than the screen 11.

  Moreover, when the waste water treatment apparatus 1 is configured to include the solid-liquid separation apparatus 2 that separates the solid and liquid by the screen 11, the configuration of the screen 11, the aeration unit 12, the transfer unit 13, and the like can be appropriately designed.

  The pump device 37 has a configuration in which the pump main body 47 is installed in a so-called lateral direction, but is not limited to such a configuration, and the installation state of the pump main body 47 can be adjusted as appropriate. Specifically, for example, the suction pipe 48 is connected to the bottom surface of the pump body 47, and the treated water is sucked into the pump body 47 in the vertical direction and discharged from the pump body 47 in the vertical direction, so-called longitudinal direction. You may make it the structure etc. which were installed. Thus, the pump main body 47 is installed in the vertical direction, so that the pumping device 37 can smoothly feed the treated water.

  The float switch 51 has an upper switch 52 and a lower switch 53. However, the float switch 51 is not limited to such a configuration, and can detect the water level in the membrane treatment tank 31 and operate the pump body 47. I just need it.

  The aeration means 12 has a configuration in which an air diffuser 17 is installed in the screen 11 and aerates from the inside of the screen 11, but is not limited to such a configuration, and aeration gas is blown to the screen 11 to the screen 11. Any structure that can remove the adhering impurities may be used.

  The transfer means 13 is not limited to the structure for transferring by the air lift action, and any structure that can transfer the separation liquid in the screen 11 to the outside of the solid-liquid separation tank 5 may be used.

  Further, in the case of a configuration in which the separation liquid is transferred by an air lift action, for example, as in the modification shown in FIG. 3, by adjusting the positions of the transfer pipe 21 and the blowing port 26 in the solid-liquid separation tank 5, The water level in the liquid separation tank 5 is controlled.

  Specifically, in the solid-liquid separation tank 5, the position of the blowing port 26 through which the transfer gas is blown from the blower 61 is adjusted to a height corresponding to the intermediate portion of the screen 11 in the transfer pipe 21. The lower part than 26 is a foreign matter storage part 62, and the upper part from the inlet 26 is a drainage storage amount adjustment part 63, so that the positions of the foreign matter storage part 62 and the wastewater storage amount adjustment part 63 can be adjusted.

  Here, normally, a water tank for storing a certain amount of supplied sewage is required in the solid-liquid separation tank 5, and in such a water tank, the impurities separated from the separation liquid are discarded. In the meantime, a space for storing the separated impurities is necessary.

  Since the solid-liquid separation device 2 is provided with the transfer means 13 by the air lift action, the water level does not drop below the blowing port 26 in the solid-liquid separation tank 5.

  In addition, the contaminants separated by the screen 11 are aerated and settled, and the concentration of the contaminants increases and concentrates outside the screen 11, making it difficult to permeate the screen 11. Is accumulated.

  Therefore, the solid-liquid separation tank 5 is adjusted by adjusting the positions (heights) of the transfer pipe 21 and the blowing port 26 in the solid-liquid separation tank 5 and adjusting the positions of the foreign substance storage unit 62 and the wastewater storage amount adjustment unit 63. 5 is preferably controlled.

  In the configuration shown in FIG. 3, when the amount of drainage supplied to the solid-liquid separation tank 5 is small and the drainage water level falls below the inlet 26 and the inlet 25, the transfer automatically stops. .

  Therefore, by adjusting the position of the transfer pipe 21 and the inlet 26 in the solid-liquid separation tank 5 to an appropriate position (height) and controlling the water level, the treatment capacity as the waste water treatment apparatus 1 can be adjusted, The process can proceed according to the amount of supply.

DESCRIPTION OF SYMBOLS 1 Waste water treatment apparatus 2 Solid-liquid separation apparatus 3 Membrane treatment apparatus 5 Solid-liquid separation tank 6 Solid-liquid separation means
11 screens
12 Aeration means
13 Transportation means
16 through hole
17 Air diffuser
21 Transfer pipe
26 Air inlet
31 Membrane treatment tank
32 Membrane treatment means
36 Membrane treatment unit
37 Pumping equipment
43 Submerged membrane
47 Pump body
48 Suction tube
49 Release tube
51 Float switch
54 Float
55 Float

The present invention relates to a waste water treatment system effluent membrane separation activated sludge treatment to you separate the sludge.

  Conventionally, as a technique for treating wastewater such as domestic wastewater and industrial wastewater, a technique including a solid-liquid separation device, a membrane separation activated sludge treatment device, and a disinfection tank is known as disclosed in Patent Document 1, for example. It has been.

  In the structure of this patent document 1, after separating the contaminants contained in waste water with a solid-liquid separator, the sludge is separated by membrane treatment while treating the activated sludge with the activated sludge treatment device, and the treated water is discharged.

  For the membrane treatment, a membrane module using a submerged membrane such as a hollow fiber type or a plate type that can capture fine particles, bacteria, and the like is used. The operation of the membrane module is switched by a float switch provided in the septic tank.

JP 2007-283170 A

  In membrane separation activated sludge treatment using a membrane treatment means such as a membrane module as in Patent Document 1, in order to stably carry out the membrane separation activated sludge treatment, the membrane treatment means is always immersed in the membrane treatment tank. It is necessary to keep the water level.

  That is, if the membrane such as the submerged membrane used in the membrane module is dried or if the sludge concentration becomes too high, the filtration capacity is significantly reduced. It is necessary to operate so as to stop the supply of the separation liquid in order to prevent overflow when the supply is started and the water level becomes high.

  Therefore, normally, in addition to a pump such as a blower, a detection means for detecting the water level in the membrane treatment tank and an operation means such as an operation panel for switching the driving of the pump based on the detection result of the detection means are provided.

  As a result, it is necessary to secure an installation space for pumps and operation means outside the membrane treatment tank, and it is difficult to reduce the size as equipment, for example, for home use, where installation space is limited and complicated installation work is not preferred It becomes difficult to apply.

  Therefore, there has been a demand for a facility that can be easily downsized and can be easily installed.

The present invention has been made in view of the above problems, and an object thereof is to provide a wastewater treatment apparatus which easily miniaturized, Ru can be easily installed.

Wastewater treatment apparatus according to 請 Motomeko 1, a solid-liquid separator for separating contaminants from waste water, a membrane treatment apparatus separating liquid impurities are separated is supplied at the solid-liquid separator The solid-liquid separation device includes a solid-liquid separation tank into which wastewater flows, and solid-liquid separation means that is installed in the solid-liquid separation tank and separates impurities from the wastewater. The means includes a cylindrical screen formed with a plurality of liquid passage holes through which the impurities cannot pass, and installed in an inclined manner in the solid-liquid separation tank, aeration means for blowing aeration gas to the screen, and the passage. possess a transfer means for transferring the separated liquid in the screen that has passed through the liquid holes, the membrane treatment apparatus, purification and membrane treatment tank the separated liquid flows, the separation liquid is installed in the membrane treating tank And a membrane treatment means for carrying out the separation liquid treatment. A membrane treatment unit that separates into mud and treated water, and a pump device that operates the drive of the membrane treatment unit; the membrane treatment unit is installed so as to be immersed in the separation liquid and is separated from the separation liquid; It has a submerged membrane capable of separating sludge, and the pump device has a pump body that can be driven in the separated liquid, and a float switch that operates the driving of the pump body. The float body floats with the separation liquid, and the water level of the separation liquid in the membrane treatment tank is detected by the float body, and the drive of the pump body is operated based on the detection result .

The waste water treatment apparatus according to claim 2 is the waste water treatment apparatus according to claim 1, wherein the pump device includes a suction pipe that sucks treated water from the membrane treatment unit, and a discharge pipe that discharges the treated water. And the pump body is located at a height higher than the upper end of the membrane processing unit, and the discharge pipe is located above the suction pipe.

The waste water treatment apparatus according to claim 3 is the waste water treatment apparatus according to claim 1 or 2, wherein the aeration means has an air diffuser installed in the screen to diffuse the aeration gas. It has a transfer pipe which transfers the separation liquid in the screen, and the aeration pipe and the transfer pipe are installed in the screen.

A wastewater treatment apparatus according to a fourth aspect of the present invention is the wastewater treatment apparatus according to any one of the first to third aspects, wherein the transfer means includes a transfer pipe that is installed in the screen and transfers the separated liquid in the screen. The transfer pipe is provided with a blowing port through which a transfer gas is blown, and when the transfer gas is blown from the blow port, the separation liquid in the screen moves through the transfer pipe, and solid-liquid separation is performed. The water level in the solid-liquid separation tank is controlled by adjusting the positions of the transfer pipe and the blowing port in the tank.

  According to the present invention, the pump device has a pump body that can be driven in waste water, and a float switch that detects the water level of the waste water in the membrane treatment tank by the float body and operates the drive of the pump body. The entire membrane treatment means can be installed in the membrane treatment tank, and can be easily miniaturized and installed easily.

It is a block diagram which shows the waste water treatment apparatus which concerns on one embodiment of this invention. It is a perspective view which shows the structure of the screen in the solid-liquid separator of a waste-water-treatment apparatus same as the above. It is a block diagram which shows the modification of the solid-liquid separator in a waste-water-treatment apparatus same as the above.

  Hereinafter, the configuration of an embodiment of the present invention will be described with reference to FIG.

  In FIG. 1, reference numeral 1 denotes a wastewater treatment apparatus. The wastewater treatment apparatus 1 is embedded in the ground and purifies wastewater such as domestic wastewater and industrial wastewater.

  The waste water treatment device 1 includes a solid-liquid separation device 2 that separates impurities from waste water. The solid-liquid separation device 2 is supplied with a separation liquid which is waste water from which impurities are separated by the solid-liquid separation device 2, and a membrane treatment device 3 for purifying the separation liquid by membrane separation activated sludge treatment. 4 and adjacent to each other via 4.

  The solid-liquid separation device 2 has a solid-liquid separation tank 5 having a hollow inside, and in this solid-liquid separation tank 5, solid-liquid separation means 6 for solid-liquid separation of waste water into impurities and separated liquid is installed. Has been.

  The solid-liquid separation tank 5 has a drainage inlet 7 to which a drainage inflow pipe (not shown) is connected, and drainage flows from the drainage inlet 7 and is stored.

  In addition, an upper opening 8 is provided at the upper part of the solid-liquid separation tank 5 and is almost at the same height as the ground. A lid 9 such as a manhole is detachably installed in the upper opening 8. ing. The upper opening 8 is normally closed with a lid 9 and is opened when the lid 9 is removed, for example, during maintenance.

  Further, the partition 4 is provided with a supply port 10, and the separation liquid from the solid-liquid separation device 2 is supplied to the membrane processing device 3 through the supply port 10.

  The solid-liquid separation means 6 includes a cylindrical screen 11 installed in the solid-liquid separation tank 5, aeration means 12 for blowing aeration gas to the screen 11, and transfer means 13 for transferring the separation liquid in the screen 11. And have.

  As shown in FIG. 2, the screen 11 is formed in a square tube shape with four flat side surfaces 14, a bottomed square tube whose lower end portion is closed by a bottom surface portion 15 and whose upper end portion is opened. Is.

  The screen 11 is inclined in the solid-liquid separation tank 5 so that the upper end portion is located on the drainage inlet 7 side and the bottom portion 15 is located on the partition 4 side opposite to the drainage inlet 7. is set up.

  A plurality of liquid passage holes 16 are provided in the side surface portion 14 of the screen 11. These liquid passage holes 16 have such a size and shape that impurities such as fibrous substances such as hair cannot pass through the drainage, and the drainage liquid can pass through, for example, a circular shape having a diameter of 3 mm. .

  When the wastewater stored in the solid-liquid separation tank 5 flows into the screen 11 from the four side surface parts 14, impurities that cannot pass through the liquid passage holes 16 are separated, and the liquid component passes through the liquid passage holes 16. Passes through the screen 11. In general, the amount of waste water that passes through the screen 11 is set to be larger than the amount of separation liquid to be processed by the membrane processing apparatus 3.

  The size and shape of the liquid passage hole 16 in the screen 11 can be designed as appropriate according to the type of wastewater to be treated and the impurities to be separated.

  The aeration means 12 has an aeration tube 17 installed in the screen 11. An aeration gas supply unit 18 connected to a blower (not shown) is provided at the upper end of the air diffuser 17. Further, an aeration gas discharge port 19 is provided at the lower end of the air diffuser 17.

  Then, the aeration gas from the blower is supplied from the aeration gas supply unit 18 to the diffuser pipe 17 and discharged from the aeration gas discharge port 19, thereby rising along the side surface portion 14 of the inclined screen 11. .

  Further, there is a possibility that impurities are attached to the side surface portion 14 of the screen 11, and the aeration gas rises along the side surface portion 14 of the screen 11, thereby removing the impurities from the side surface portion 14. The removed impurities are precipitated as they are and deposited on the bottom of the solid-liquid separation tank 5.

  Note that the inclination angle of the screen 11 and the aeration amount of the aeration means 12 can be appropriately adjusted according to the impurities to be removed.

  The transfer means 13 has a transfer pipe 21 that transfers the separation liquid in the screen 11. The transfer pipe 21 is installed in the screen 11.

  A separation liquid supply unit 22 that supplies the separation liquid transferred through the transfer pipe 21 to the membrane processing apparatus 3 is provided at the upper end of the transfer pipe 21. The separation liquid supply unit 22 includes a connection part 23 communicating with the transfer pipe 21 and a separation liquid supply pipe 24 connected from the connection part 23 to the supply port 10.

  The lower end of the transfer pipe 21 is provided with a suction port 25 that is opened in an elliptical shape so that the transfer pipe 21 is cut in an inclined manner. Further, in the vicinity of the suction port 25, for example, a blow port 26 opened in a circular shape is formed.

  An air lift gas supply pipe 27 having a slightly smaller diameter than the transfer pipe 21 is installed in the screen 11.

  The air lift gas supply pipe 27 is disposed substantially in parallel with the transfer pipe 21 and has a lower end connected to the blowing port 26. In other words, the air lift gas supply pipe 27 communicates with the transfer pipe 21 via the blowing port 26. In addition, an air lift gas supply unit 28 connected to a blower (not shown) is provided at the upper end of the air lift gas supply pipe 27.

  The air lift gas from the blower is supplied to the air lift gas supply pipe 27 via the air lift gas supply section 28, descends in the air lift gas supply pipe 27, and flows into the transfer pipe 21 from the blowing port 26. The inside of the transfer pipe 21 is raised.

  As described above, the air lift gas is supplied to the transfer pipe 21 and moves up in the transfer pipe 21, whereby the separation liquid in the screen 11 is sucked from the suction port 25 by the air lift action. Further, the separation liquid sucked into the transfer pipe 21 rises together with the air lift gas rising inside the transfer pipe 21 and is supplied from the separation liquid supply unit 22 to the membrane processing apparatus 3 outside the solid-liquid separation tank 5. .

  The membrane treatment apparatus 3 includes a membrane treatment tank 31 having a hollow interior provided integrally with the solid-liquid separation tank 5 via a partition 4. In the membrane treatment tank 31, membrane treatment means 32 for purifying the separated liquid as waste water is installed. Further, the membrane treatment tank 31 is provided with a discharge port 33.

  The separation liquid supplied from the solid-liquid separation device 2 to the membrane treatment device 3 is stored in the membrane treatment tank 31, and after the pollutant is adsorbed and oxidized and decomposed by the activated sludge microorganisms in the sludge, the membrane treatment means. The sludge is filtered and decomposed by 32. That is, since the membrane treatment means 32 also has the function of a sedimentation tank in a normal activated sludge method, sludge is filtered and separated by membrane treatment, so that the sludge does not flow out of the membrane treatment tank 31, and the membrane treatment tank 31 The activated sludge inside is maintained at a high concentration.

  An upper opening 34 located at the same height as the ground is provided in the upper part of the film processing tank 31, and a lid 35 such as a manhole is detachably installed in the upper opening 34. The upper opening 34 is normally closed with a lid 35, and is opened when the lid 35 is removed, for example, during maintenance.

  Membrane treatment means 32 can be driven in water with a membrane treatment unit 36 that biologically treats with activated sludge microorganisms contained in sludge while separating the separation liquid into sludge and treated water while immersed in the separation liquid And a pump device 37 as a submersible pump.

  The film processing unit 36 has a frame 41 formed of, for example, a plastic plate.

  A plurality of cylindrical pipe members 42 are fixed to the frame body 41, and a plurality of submerged membranes 43 such as hollow fibers are connected to and connected to the pipe members 42, for example.

  The submerged membrane 43 is preferably a microfiltration (MF) membrane having a pore size of 0.1 to 0.4 μm and capable of passing pathogens and inorganic or organic contaminants. The submerged membrane 43 is installed so as to be immersed in the separation liquid, the sludge in the separation liquid cannot permeate, the treated water containing pathogens and inorganic or organic contaminants can permeate, and the sludge is removed from the separation liquid. Separate by filtration.

  Each pipe member 42 communicates with and is connected to the collecting pipe 45 through the pipe 44. That is, the collecting pipe 45 communicates with each submerged film 43 via the pipe member 42 and the pipe 44.

  In addition, an air diffuser 46 is installed on the frame body 41 so as to be positioned below the submerged film 43. The air diffuser 46 releases aeration gas toward the submerged film 43. Then, by releasing the aeration gas from the aeration device 46, the biological treatment in the membrane treatment tank 31 proceeds, and the membrane surface of the submerged membrane 43 is washed.

  The pump device 37 has a pump body 47 that can be driven in drainage. That is, the pump device 37 can be driven even when the pump main body 47 is immersed in the waste water. By driving the pump main body 47, a suction force is applied to the film processing unit 36, and the film processing unit 36 is used in the film processing tank 31. The separated liquid is sucked and separated by filtration, and the membrane separation activated sludge treatment proceeds.

  One end of a suction pipe 48 that sucks treated water from the membrane treatment unit 36 and one end of a discharge pipe 49 that discharges treated water sucked by the suction pipe 48 are connected to the pump body 47.

The other end of the suction pipe 48 is connected to the collecting pipe 45, and the other end of the discharge pipe 49 is connected to the discharge port 33. That is, by driving the pump body 47, and proceeds filtered off by submerged membrane 43, treated water separated sludge is Aspirate by suction tube 48 through the collecting pipe 45 and the pipe member 42. Further, the suctioned treated water is discharged to the discharge port 33 through the discharge pipe 49.

  From the viewpoint of safely draining treated water, it is preferable to connect the discharge pipe 49 to a disinfecting tank (not shown) and disinfect the treated water in this disinfecting tank and then discharge it from the waste water treatment apparatus 1. Specifically, for example, a disinfectant such as a solid chlorine agent is added in the disinfecting tank, or a disinfecting liquid such as a chlorine-based chemical solution is injected into the discharge pipe 49 and is retained in the disinfecting tank for about 15 minutes. It can be disinfected by mixing.

  Here, the pump device 37 is provided with a float switch 51 for operating the drive of the pump body 47.

  The float switch 51 includes an upper switch 52 located on the upper side and a lower switch 53 located on the lower side of the upper switch 52.

  Each of the upper switch 52 and the lower switch 53 has float bodies 54 and 55 that can float by the separation liquid in the membrane treatment tank 31.

  The float switch 51 detects the water level of the separation liquid stored in the membrane treatment tank 31 by the rise and fall of the float bodies 54 and 55 due to the change in the water level of the separation liquid in the membrane treatment tank 31.

  The float switch 51 switches driving of the pump body 47 based on the detection result of the water level by the float bodies 54 and 55. Specifically, when the storage amount (water level) of the separation liquid in the membrane treatment tank 31 exceeds a certain amount and the float bodies 54 and 55 rise together, the pump body 47 is driven to advance the membrane separation activated sludge treatment. . Further, when the separation liquid storage amount (water level) becomes less than a certain amount due to the progress of the membrane separation activated sludge treatment, and both the float bodies 54 and 55 are lowered, the driving of the pump device 37 is stopped.

  In the membrane treatment device 3, the suction side of the submerged membrane 43 and the suction side of the pump main body 47 are immersed in water, and the submerged membrane 43 and the pump main body 47 are installed relatively close to each other. If there is a part where the downstream side is located below the upstream side in the flow path of the processing liquid and descends, when air is sucked in, the air tends to accumulate at the descending part and so-called air biting is likely to occur.

  When the air bite occurs, maintenance is required to remove the air accumulated in the flow path, and the maintenance work is very complicated.

  Therefore, in order to prevent air entrainment, the pump body 37 has a pump body 47 at a height higher than the upper end of the membrane processing unit 36 so that the downstream side is not positioned below the upstream side in the flow path of the processing liquid. It is preferable that the discharge pipe 49 is positioned so as to be located above the suction pipe 48.

  Specifically, the discharge pipe 49 is located above the suction pipe 48, the treated water is sucked into the pump body 47 from the suction pipe 48 in the horizontal direction, and the treated water is discharged from the pump body 47 into the discharge pipe 49 in the horizontal direction. As described above, it is preferable to install the pump main body 47 on the upper portion of the collecting pipe 45. In many cases, the pump body 47 is usually installed so as to be sucked and discharged in the vertical direction. If the installation state is vertical, it is preferably installed sideways.

  The suction pipe 48 and the discharge pipe 49 are preferably piped so that the downstream side is not located below the upstream side.

  When a flexible tubular body such as a hose is used as the suction pipe 48 and the discharge pipe 49, piping may be performed so that a portion that hangs down and falls from the upstream side does not occur due to bending. preferable.

  Next, the operation and effect of the one embodiment will be described.

  When the waste water is treated by the waste water treatment apparatus 1, first, the waste water is supplied from the waste water inlet 7, and the waste water is stored in the solid-liquid separation tank 5.

  The stored wastewater flows so as to flow into the screen 11 from the four side surface portions 14, and is solid-liquid separated by the screen 11 into impurities and a separation liquid.

  Specifically, when drainage flows into the screen 11, impurities in the drainage cannot pass through the liquid passage holes 16 of the side surface portion 14, and only liquid components in the drainage pass through the liquid passage holes 16 of the side surface portion 14. To do. Therefore, the screen 11 separates the contaminants and the separation liquid, and the separation liquid flows into the screen 11.

  The solid-liquid separation tank 5 is not always supplied with the same amount of waste water, and a large amount of waste water may be supplied in a short time. It is preferable to keep it low.

  Here, the separated impurities may adhere to the outside of the screen 11. Therefore, the screen 11 is aerated from the inside by the aeration means 12, and the aeration gas is raised along the inner peripheral surface of the side surface portion 14 of the screen 11, thereby removing impurities adhering to the screen 11. Prevent clogging.

  Further, the separation liquid in the screen 11 rises along the transfer pipe 21 together with the air lift gas by the air lift action by the transfer means 13, and is supplied to the membrane treatment tank 31 via the separation liquid supply unit 22.

  When the float bodies 54 and 55 are both lifted and faced upward due to the rise of the water level of the separation liquid supplied to the membrane treatment tank 31, the float switch 51 is actuated to drive the pump device 37.

  When the pump device 37 is driven, the separation liquid stored in the membrane treatment tank 31 is sucked into the membrane treatment unit 36.

  When the separation liquid is sucked into the membrane treatment unit 36, sludge and fine particles cannot pass through the submerged membrane 43, and the sludge is separated and only treated water flows through the submerged membrane 43 and flows in.

  In addition, the biological treatment by the activated sludge microorganisms contained in the sludge proceeds due to the air diffused by the air diffuser 46, and the sludge and fine particles attached to the outside of the submerged film 43 are removed.

  Furthermore, when the sludge removed by aeration flows along the film surface of the submerged film 43, the film surface is physically washed by the flowing sludge, and the submerged film 43 is prevented from being blocked. .

  The removed sludge is precipitated as it is and deposited on the bottom of the membrane treatment tank 31, and acts as a biological treatment sludge in the membrane treatment tank 31.

  The treated water flowing into each submerged membrane 43 collects in the collecting pipe 45 through the pipe member 42 and the pipe 44. Further, it is sucked into the suction pipe 48 as it is, and is discharged out of the waste water treatment apparatus 1 from the discharge port 33 through the discharge pipe 49.

  Here, when the flow rate of the separation liquid from the solid-liquid separation device 2 is small, the water level of the separation liquid in the membrane treatment tank 31 decreases as the filtration separation process by the membrane treatment means 32 proceeds.

  When the water level of the separated liquid becomes lower than that of the float bodies 54 and 55 and both the float bodies 54 and 55 are lowered, the float switch 51 is actuated to stop the driving of the pump device 37 and the membrane separation activated sludge by the membrane treatment means 32 is activated. Processing stops.

  And according to the said waste water treatment apparatus 1, the pump apparatus 37 detects the water level of the separation liquid in the membrane treatment tank 31 with the pump main body 47 which can be driven in a separation liquid, and the float bodies 54 and 55. Since the float switch 51 for operating the drive of the main body 47 is provided, the entire membrane treatment means 32 can be installed in the membrane treatment tank 31. That is, the submerged membrane 43 and the pump main body 47 can be connected and immersed in the separation liquid in the membrane treatment tank 31.

  Therefore, for example, unlike the prior art, there is no need to install a pump or operating means outside the membrane treatment tank 31, and the membrane treatment apparatus 3 can be easily downsized.

  Further, since the entire membrane treatment means 32 can be installed in the membrane treatment tank 31, assembly work and piping work are easy, and the membrane treatment apparatus 3 can be easily and inexpensively installed.

  As a result, it is easy to apply even in applications where installation space is limited and complicated installation work is not preferred, such as home use, and can be installed in various situations.

  The pump device 37 is installed such that the pump body 47 is located at a height higher than the upper end of the membrane processing unit 36, and the discharge pipe 49 is located above the suction pipe 48, so that the separation liquid in the pump body 47 is Since the air hardly accumulates in the flow path of the air and can prevent air biting, the membrane separation activated sludge treatment can proceed smoothly.

  In addition, the suction pipe 48 and the discharge pipe 49 are piped so that the downstream side is not positioned below the upstream side, so that it is difficult for air to accumulate in the pipe path, preventing air biting. You can proceed to.

  Since the solid-liquid separation means 6 has the cylindrical screen 11 installed in an inclined manner in the solid-liquid separation tank 5, for example, a water contact area of the same level even if smaller than a flat screen such as the above-mentioned Patent Document 2. It is not necessary to partition the solid-liquid separation tank 5.

  Therefore, the installation state of the screen 11 is hardly influenced by the shape of the solid-liquid separation tank 5, and the installation state of the screen 11 in the solid-liquid separation tank 5 can be easily adjusted.

  As a result, the screen 11 is easy to maintain. In addition, regardless of installation problems, it is easy to install the screen 11 appropriately according to the shape of the solid-liquid separation tank 5, the amount of drainage, and the type of drainage from the viewpoint of processing capacity, and the solid-liquid separation device 2 is downsized. it can.

  In particular, since the screen 11 has a rectangular cylindrical shape, the orientation of the screen 11 can be easily adjusted, and the positioning in the solid-liquid separation tank 5 is easy, so that maintenance and the like are easy.

  Further, by disposing the diffuser pipe 17 and the transfer pipe 21 in the screen 11, the solid-liquid separation means 6 can be reduced in size and handled easily.

  Further, the transfer pipe 21 adjusts the amount of wastewater stored in the solid-liquid separation tank 5 by adopting a configuration in which the separation liquid is transferred by a so-called air lift action when the transfer gas is blown from the blowing port 26. Cheap.

In the embodiment described above, the pump unit 37 is a pump body 47 has an installation configurations so-called lateral, not limited to such a configuration, installation state of the pump body 47 is appropriately adjusted Is possible. Specifically, for example, the suction pipe 48 is connected to the bottom surface of the pump body 47, and the treated water is sucked into the pump body 47 in the vertical direction and discharged from the pump body 47 in the vertical direction, so-called longitudinal direction. You may make it the structure etc. which were installed. Thus, the pump main body 47 is installed in the vertical direction, so that the pumping device 37 can smoothly feed the treated water.

  The float switch 51 has an upper switch 52 and a lower switch 53. However, the float switch 51 is not limited to such a configuration, and can detect the water level in the membrane treatment tank 31 and operate the pump body 47. I just need it.

  The aeration means 12 has a configuration in which an air diffuser 17 is installed in the screen 11 and aerates from the inside of the screen 11, but is not limited to such a configuration, and aeration gas is blown to the screen 11 to the screen 11. Any structure that can remove the adhering impurities may be used.

  The transfer means 13 is not limited to the structure for transferring by the air lift action, and any structure that can transfer the separation liquid in the screen 11 to the outside of the solid-liquid separation tank 5 may be used.

  Further, in the case of a configuration in which the separation liquid is transferred by an air lift action, for example, as in the modification shown in FIG. 3, by adjusting the positions of the transfer pipe 21 and the blowing port 26 in the solid-liquid separation tank 5, The water level in the liquid separation tank 5 is controlled.

  Specifically, in the solid-liquid separation tank 5, the position of the blowing port 26 through which the transfer gas is blown from the blower 61 is adjusted to a height corresponding to the intermediate portion of the screen 11 in the transfer pipe 21. The lower part than 26 is a foreign matter storage part 62, and the upper part from the inlet 26 is a drainage storage amount adjustment part 63, so that the positions of the foreign matter storage part 62 and the wastewater storage amount adjustment part 63 can be adjusted.

  Here, normally, a water tank for storing a certain amount of supplied sewage is required in the solid-liquid separation tank 5, and in such a water tank, the impurities separated from the separation liquid are discarded. In the meantime, a space for storing the separated impurities is necessary.

  Since the solid-liquid separation device 2 is provided with the transfer means 13 by the air lift action, the water level does not drop below the blowing port 26 in the solid-liquid separation tank 5.

  In addition, the contaminants separated by the screen 11 are aerated and settled, and the concentration of the contaminants increases and concentrates outside the screen 11, making it difficult to permeate the screen 11. Is accumulated.

  Therefore, the solid-liquid separation tank 5 is adjusted by adjusting the positions (heights) of the transfer pipe 21 and the blowing port 26 in the solid-liquid separation tank 5 and adjusting the positions of the foreign substance storage unit 62 and the wastewater storage amount adjustment unit 63. 5 is preferably controlled.

  In the configuration shown in FIG. 3, when the amount of drainage supplied to the solid-liquid separation tank 5 is small and the drainage water level falls below the inlet 26 and the inlet 25, the transfer automatically stops. .

  Therefore, by adjusting the position of the transfer pipe 21 and the inlet 26 in the solid-liquid separation tank 5 to an appropriate position (height) and controlling the water level, the treatment capacity as the waste water treatment apparatus 1 can be adjusted, The process can proceed according to the amount of supply.

DESCRIPTION OF SYMBOLS 1 Waste water treatment apparatus 2 Solid-liquid separation apparatus 3 Membrane treatment apparatus 5 Solid-liquid separation tank 6 Solid-liquid separation means
11 screens
12 Aeration means
13 Transportation means
16 through hole
17 Air diffuser
21 Transfer pipe
26 Air inlet
31 Membrane treatment tank
32 Membrane treatment means
36 Membrane treatment unit
37 Pumping equipment
43 Submerged membrane
47 Pump body
48 Suction tube
49 Release tube
51 Float switch
54 Float
55 Float

Claims (6)

A membrane treatment tank into which wastewater flows,
A membrane treatment means installed in the membrane treatment tank to purify the waste water,
The membrane treatment means has a membrane treatment unit that separates the waste water into sludge and treated water, and a pump device that operates the drive of the membrane treatment unit,
The membrane treatment unit has a submerged membrane that is installed so as to be immersed in the wastewater and capable of separating sludge from the wastewater.
The pump device has a pump body that can be driven in the waste water, and a float switch that operates the driving of the pump body.
The float switch has a float body that can float by the waste water, detects the water level of the waste water in the membrane treatment tank by the float body, and operates the drive of the pump body based on the detection result. A membrane processing apparatus. The pump device has a suction pipe for sucking treated water from the membrane treatment unit and a discharge pipe for discharging the treated water, and the pump body is located at a height higher than the upper end of the membrane treatment unit, and the discharge The film processing apparatus according to claim 1, wherein the tube is installed so as to be positioned above the suction tube. A solid-liquid separator that separates impurities from the waste water;
The film processing apparatus according to claim 1 or 2,
Waste water from which impurities are separated by the solid-liquid separation device is supplied to the membrane treatment device. Solid-liquid separator
A solid-liquid separation tank into which wastewater flows,
A solid-liquid separation means that is installed in the solid-liquid separation tank and separates impurities from the waste water,
The solid-liquid separation means includes a cylindrical screen in which a plurality of liquid passage holes through which the contaminants cannot pass are formed and inclined in the solid-liquid separation tank, and aeration means for blowing aeration gas to the screen. The wastewater treatment apparatus according to claim 3, further comprising: a transfer unit configured to transfer the separation liquid in the screen that has passed through the liquid passage hole. The aeration means has an air diffuser installed in the screen to diffuse the aeration gas,
The transfer means has a transfer pipe for transferring the separation liquid in the screen,
The waste water treatment apparatus according to claim 4, wherein the air diffusion pipe and the transfer pipe are installed in the screen. The transfer means has a transfer pipe installed in the screen for transferring the separation liquid in the screen,
The transfer pipe is provided with a blowing port through which transfer gas is blown,
When the transfer gas is blown from the blowing port, the separation liquid in the screen moves in the transfer pipe,
The wastewater treatment apparatus according to claim 4 or 5, wherein the water level in the solid-liquid separation tank is controlled by adjusting the positions of the transfer pipe and the blowing port in the solid-liquid separation tank.

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