JP2004283658A - Waste water treatment equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technique effective to enable a suction pump to be smoothly operated in waste water treatment equipment provided with the suction pump in a passageway through which the waste water containing a gas is passed. <P>SOLUTION: The waste water treatment equipment 100 provided with an aeration/filtration tank 200 is provided with a separator 230 within a part of the passageway where is influenced by the suction effect of the suction pump 240. The separator 230 has a structure in which the waste water containing the gas is separated into the gas and a liquid, and the separated gas and the separated liquid can be stored. This can minimize the possibility that the suction pump 240 sucks the gas mixed with the liquid and therefore enables the suction pump 240 to be smoothly operated. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a technology for constructing a wastewater treatment apparatus provided with a suction pump in a flow path through which treated water containing gas flows.
[0002]
[Prior art]
BACKGROUND ART Conventionally, as a wastewater treatment device for treating wastewater discharged from a general household or the like, or industrial wastewater, a device equipped with a membrane filtration device (filtration membrane module) is known. In this type of wastewater treatment device, for example, a suction pump is installed downstream of the membrane filtration device, and the water to be treated is suctioned by the suction pump and filtered (suction filtration) when passing through the membrane filtration device. (For example, refer to Patent Document 1). Further, an air supply device is provided below the membrane filtration device. For example, when the suction pump is stopped, an air flow supplied from the air supply device removes filtration sludge and the like, and cleans the membrane surface of the filtration membrane module. It has become so. Such a wastewater treatment device is effective for efficiently filtering the water to be treated by suction filtration.
[0003]
[Patent Document 1]
JP 2000-288543 A
[0004]
[Problems to be solved by the invention]
By the way, in the above-mentioned conventional wastewater treatment apparatus equipped with a membrane filtration device, the air supplied from the air supply device may stay in a pipe (header tube) or the like between the membrane filtration device and the suction pump. In such a case, when the suction pump is started, the staying air may be sucked into the suction pump and bitten, thereby hindering the smooth operation of the suction pump.
In view of the above, the present invention has been made in view of the above points, and in a wastewater treatment apparatus provided with a suction pump in a circulation path through which treated water containing gas flows, it is necessary to enable a smooth operation of the suction pump. It is an object to provide effective technology.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the invention described in each claim is configured. The invention described in each of these claims is for treating wastewater discharged from general households and the like, industrial wastewater and the like, and is provided with a suction pump in a distribution path through which treated water containing gas such as air flows. This technology is widely applied to wastewater treatment equipment.
[0006]
(Invention of claim 1)
In the wastewater treatment apparatus according to the first aspect, at least a suction pump and a storage unit are provided in the distribution channel.
The circulation path is defined as a path through which treated water containing gas such as air (water to be treated before being subjected to a predetermined treatment or treated water after being subjected to a prescribed treatment) can circulate or stay. The “gas” in the present invention broadly includes air supplied in aeration treatment or the like and various gases generated in the process of treating wastewater (sewage). The suction pump has a configuration capable of sucking the treated water in this circulation path, and is used when transferring the treated water from the upstream region to the downstream region, or when circulating the treated water from the downstream region to the upstream region. Examples of the “suction pump” in the present invention include a configuration in which the pump main body is disposed outside the tank and a submersible pump in which the pump main body is disposed in water.
[0007]
In the present invention, the storage section is provided in the distribution channel. This storage unit has a configuration capable of storing the treated water in a gas-liquid separation state. Therefore, the gas-liquid separated water stays in the lower region of the storage unit, and the gas-liquid separated gas stays in the upper region of the storage unit. The storage unit may have only a storage function of storing water and gas after being in a gas-liquid separation state by another gas-liquid separation unit, or may have a processing function in addition to the storage function. A configuration that also has a gas-liquid separation function of separating water from gas and liquid may be used. For example, a container configured to store water and gas in a gas-liquid separated state by gas-liquid separation of the treated water, specifically, a container arranged in a vertically long shape and having a sufficiently large channel diameter is installed in the distribution channel. . Thus, the gas in the treated water flowing into the container rises in the water due to its buoyancy in the process of moving inside the container, and forms a gas-liquid interface. The storage unit having such a configuration has both a gas-liquid separation function and a storage function.
[0008]
Further, the suction side (suction side) of the suction pump is connected to the storage section, and the storage section is provided in a range where the suction action of the suction pump can reach. The “storage provided in a range where the suction action of the suction pump can reach” in the present invention is a typical example in which the suction side of the suction pump and the storage are connected to each other in a closed system. is there. In the storage unit having such a configuration, even if the suction force by the suction pump acts in a state where the gas-liquid separation state is formed, the water separated by the gas and liquid is only transferred by the suction force of the suction pump, and a large amount of water is transferred. It is possible to minimize the transfer of the gas mixed with water to the downstream side and suction by the suction pump.
[0009]
For example, in a system in which air supplied by aeration treatment or the like remains in the treated water, when the suction pump is disposed downstream thereof, the air is caught in the suction pump, and the smooth operation of the suction pump is hindered by cavitation and the like. There is a risk. Therefore, as in the present invention, by providing the storage portion having the above-described configuration in a range where the suction action of the suction pump can reach, it is possible to make it difficult for the air to move to the suction pump side, and the gas is mixed with water. Thus, the suction by the suction pump can be prevented as much as possible.
[0010]
(Invention of claim 2)
The wastewater treatment apparatus according to a second aspect is the same as the first aspect, further including a gas discharge unit. The gas discharging means has a configuration capable of discharging the gas retained in the storage section out of the system, typically outside the wastewater treatment device. For example, a configuration in which a gas discharging pipe is connected to the storage section, a configuration in which an opening / closing valve and a gas suction blower are further provided in the gas discharging pipe, and the like can be used. This allows the gas retained in the storage unit to be discharged out of the system, and it is possible to more reliably prevent the gas mixed with water from being sucked by the suction pump. In addition, by adopting a configuration in which gas is discharged from the storage unit via the gas discharging unit, the capacity of the storage unit can be suppressed to a necessary limit, and the apparatus can be made compact.
[0011]
(Invention of claim 3)
Further, the wastewater treatment device according to claim 3 is the same as the structure according to claim 1 or 2, further including a membrane filtration device and an air supply unit upstream of the storage unit.
The membrane filtration device can be constituted by, for example, a flat membrane module or a capillary module using a hollow fiber membrane. When the water to be treated passes through the membrane filtration device, solid matter such as sludge is filtered. In the present invention, the suction force of the suction pump acts on the water to be treated passing through the membrane filtration device. That is, in the wastewater treatment device of the present invention, the suction filtration of the water to be treated is performed by the cooperation of the membrane filtration device and the suction pump. By this suction filtration, sludge and the like in the water to be treated are filtered and adhere to the membrane surface of the membrane filtration device. Further, the water to be treated is transferred from the membrane filtration device to the storage unit by the suction force of the suction pump.
[0012]
The air supply means has a configuration for supplying air to the membrane filtration device. This air supply means is configured by, for example, connecting the discharge side of a blower to a pipe for air supply. The air supplied by the air supply means can be used for cleaning sludge and the like adhering to the membrane surface of the membrane filtration device by, for example, suction filtration. Further, this air supply means may be used also as a means for supplying air for aeration processing.
When air is supplied to the membrane filtration device in a configuration in which the suction filtration is performed using the membrane filtration device and the suction pump, the air is sucked by the suction pump and bites in the process of the suction filtration to hinder the smooth operation of the suction pump. Although there is a possibility, the present invention is particularly effective for a wastewater treatment apparatus having such a configuration.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the wastewater treatment apparatus of the present invention will be described with reference to the drawings. Here, FIG. 1 is a diagram illustrating a configuration of a wastewater treatment apparatus 100 according to the present embodiment. FIG. 2 is a diagram showing the configuration of the aeration / filtration tank 200 in FIG.
[0014]
As shown in FIG. 1, the wastewater treatment apparatus 100 (purification tank) includes a pretreatment tank 110, an aeration / filtration tank 200, a disinfection tank 120 from the upstream side (left side in FIG. 1) in the order of the wastewater treatment process. A discharge pump tank 130 is provided. Each of these tanks is incorporated in one tank-like body 101 constituting the wastewater treatment apparatus 100. In the present embodiment, wastewater (sewage) that has flowed into the wastewater treatment device 100 is discharged after being subjected to various processes continuously in a process of flowing through a flow path formed inside the tank body 101. It has become.
[0015]
In the pretreatment tank 110, for example, a process of adjusting the flow rate of wastewater (sewage) flowing from outside the apparatus, a process of separating impurities, oil, and the like contained in the wastewater are performed. In the aeration / filtration tank 200, air is added to the wastewater by adding air (air) to the wastewater, and aeration of the wastewater is performed by creating an appropriate water flow (swirl flow) in the tank. . This aeration process produces solids such as sludge in the tank. Sludge and the like generated by the aeration treatment are separated by the membrane filtration device 210 and discharged to the outside of the wastewater treatment device 100 (outside the system). On the other hand, the water after the sludge is separated and removed by the membrane filtration device 210 is sent to the disinfecting tank 120, where the water is disinfected by the disinfectant. The water that has been disinfected in the disinfection tank 120 is temporarily stored in the discharge pump tank 130, and then discharged to the outside of the wastewater treatment apparatus 100 (outside the system) by the discharge pump.
[0016]
As shown in FIG. 2, the aeration / filtration tank 200 includes a membrane filtration device 210, an air supply device 220, a separation device 230, a suction pump 240, a control device 250, and the like.
[0017]
The membrane filtration device 210 has a configuration in which a filtration membrane module M is incorporated in a flow path through which the water to be treated flows. The filtration membrane module M includes, for example, a flat membrane module using a flat membrane, a capillary module using a hollow fiber membrane, and the like. On the membrane surface of the filtration membrane module M, pores smaller in size than the components of the sludge (dirt) generated by the aeration treatment are formed, and the permeated water (water other than the sludge) passing through the pores is the It is configured to be transferred to the separation device 230 through one transfer pipe 211.
[0018]
The air supply device 220 is configured by, for example, connecting a blower 222 to an air supply pipe 221 having many air supply holes. When the blower 222 is operated, air is supplied into the tank through the air supply hole of the air supply pipe 221. For example, when the blower 222 is operated during the normal operation, the aeration treatment of the water to be treated is performed. Further, for example, by operating the blower 222 during the cleaning operation, an air flow is applied to the filtration membrane module M, and sludge and the like attached to the membrane surface of the filtration membrane module M by the filtration process are removed. As described above, the air supply device 220 of the present embodiment has both functions of an air supply function for aeration processing and an air flow providing function for cleaning the filtration membrane module M. The air supply device 220 and the like constitute an air supply unit in the present invention.
[0019]
The separation device 230 includes a gas-liquid separation chamber 231, and the first transfer pipe 211, the second transfer pipe 234, and the gas discharge pipe 235 are connected to the gas-liquid separation chamber 231.
[0020]
The gas-liquid separation chamber 231 has a configuration in which, for example, a cylindrical tube is arranged in a vertically long shape. In the present embodiment, for example, a cylindrical tube having a sufficiently large flow path diameter (diameter relating to a flow path cross section) is arranged in a vertically long shape. I have. The gas-liquid separation chamber 231 forms a vertical (up-down) flow path. The gas-liquid separation chamber 231 corresponds to the “reservoir provided in a range where the suction action by the suction pump can reach” in the present invention. Here, the “cylindrical pipe having a sufficiently large flow path diameter” here is a typical example in which the diameter (flow path diameter) of the cylindrical pipe is larger than the flow path diameter of the flow path before and after the cylindrical pipe. is there. According to such a configuration, since the direction of the flow path in the gas-liquid separation chamber 231 matches the direction in which gas and water are separated (gas-liquid separation direction), gas-liquid separation can be performed rationally. It becomes. In addition, since the flow path in the gas-liquid separation chamber 231 extends vertically, it is effective to increase the residence time effective for gas-liquid separation. Further, the flow rate of the water (inflow water) flowing into the gas-liquid separation chamber 231 is reduced by expanding the flow path diameter, and the flow path diameter is reduced at the outlet side of the gas-liquid separation chamber 231. In the gas-liquid separation chamber 231, water is likely to stay (retention time is increased). Such a state is an effective state for separating gas (gas mainly composed of air) contained in water from the water side, and inflow water containing gas is effectively gas-liquid separated from the water side, The water that has undergone gas-liquid separation forms a water retention section 232 below the gas-liquid separation chamber 231 and stays therein. On the other hand, the gas contained in the water rises in the water retaining portion 232 by buoyancy in the process of descending in the room, and forms a gas retaining portion 233 on the upper side of the room and stays. Such a configuration is particularly effective for suppressing cavitation in the suction pump 240.
The flow path length, flow path diameter, volume, and the like of the gas-liquid separation chamber 231 can be appropriately set in consideration of drainage treatment conditions, gas-liquid separation conditions, and the like.
[0021]
The first transfer pipe 211 has an outlet connected to, for example, a side of the gas-liquid separation chamber 231, and introduces permeated water that has passed through the membrane filtration device 210 (the filtration membrane module M) into the gas-liquid separation chamber 231. Form a path. Further, the first transfer pipe 211 is arranged at a position lower than the upper end of the gas-liquid separation chamber 231. Thereby, it is possible to prevent the gas from staying in the first transfer pipe 211.
Further, in the present embodiment, the connection point of the first transfer pipe 211 with the gas-liquid separation chamber 231 is arranged in the horizontal direction. That is, the direction of the flow path in the first transfer pipe 211 and the direction of the flow path in the gas-liquid separation chamber 231 intersect with each other. As a result, the permeated water that has passed through the membrane filtration device 210 flows into the gas-liquid separation chamber 231 with a horizontal velocity component, and then the direction of the flow path is changed, so that the inside of the gas-liquid separation chamber 231 moves downward from above. And will be distributed. At this time, the flow direction of the water (inflow water) flowing into the gas-liquid separation chamber 231 is reduced by changing the direction of the flow path. According to such a configuration, cavitation in the suction pump 240 can be more reliably suppressed by the synergistic effect of the effect of changing the flow path direction and the effect of expanding the flow path diameter.
The second transfer pipe 234 has an inlet connected to, for example, the bottom of the gas-liquid separation chamber 231, and forms a path for leading water retained in the water retaining section 232 to the suction pump 240 side.
[0022]
The gas discharge pipe 235 has an inlet connected to, for example, an upper part of the gas-liquid separation chamber 231, and forms a path for discharging the gas retained in the gas retaining section 233 to the outside of the wastewater treatment apparatus 100 (outside the system). It is preferable that the gas discharge pipe 235 is configured to extend in the up-down direction. According to such a configuration, the discharge direction of the gas matches the flow direction of the gas moving in the gas-liquid separation chamber 231 in the vertical direction, so that the gas can be discharged rationally.
The gas discharge pipe 235 is provided with an on-off valve 236 that can open and close the path. The on-off valve 236 is opened, for example, at the timing when the gas is discharged from the gas retaining section 233. The on-off valve 236 may be configured to open and close based on the pressure of the gas-liquid separation chamber 231. Note that the gas exhaust pipe 235 and the on-off valve 236 constitute a gas exhaust means in the present invention.
[0023]
The suction pump 240 is installed in a closed circulation path through which the treated water flows, and the suction side (suction side) thereof is connected to the second transfer pipe 234. Further, the suction pump 240 has a suction capacity capable of applying a suction force to the water to be treated to be treated by the membrane filtration device 210. When the suction pump 240 is operated, a suction force acts on a closed system from the membrane filtration device 210 to the suction pump 240. As a result, the water to be treated moves in the membrane filtration device 210 to start the filtration process, and the water that has passed through the membrane filtration device 210 due to the filtration process passes through the first transfer pipe 211 to the gas-liquid separation chamber 231. Transferred to The water retained in the water retaining section 232 of the gas-liquid separation chamber 231 is sucked by the suction force of the suction pump 240 and is discharged toward the disinfection tank 120. That is, the suction pump 240 according to the present embodiment has both a function of providing a suction effect to the water to be treated passing through the inside of the membrane filtration device 210 and a function of transferring the water retained in the water retaining section 232. .
[0024]
The control device 250 has a configuration for controlling various devices constituting the wastewater treatment device 100. In the configuration related to the aeration / filtration tank 200, the blower 222, the on-off valve 236, the suction pump 240 and the like are electrically connected to the control device 250, and the control of these devices is performed by the control device 250. I have. Note that the on-off valve 236 may be configured not to be controlled by the control device 250, for example, may be configured to be manually opened at the time of inspection or the like.
[0025]
Next, processing in the aeration / filtration tank 200 having the above configuration will be described.
For example, when the operation of the blower 222 is started in the normal operation, the air is supplied into the aeration / filtration tank 200 through the air supply hole of the air supply pipe 221 to start the aeration processing. Further, when the operation of the suction pump 240 is started, the suction filtration by the membrane filtration device 210 (the filtration membrane module M) is started. Sludge that does not pass through the filtration membrane module M due to the suction filtration adheres to the membrane surface. On the other hand, the permeated water that has passed through the filtration membrane module M is sucked by the suction action of the suction pump 240 in a state containing a gas mainly composed of air, and flows to the gas-liquid separation chamber 231 through the first transfer pipe 211. In the gas-liquid separation chamber 231, inflow water containing gas is subjected to gas-liquid separation, and the gas-liquid separated water forms a water retention section 232, and the gas-liquid separated gas forms a gas retention section 233. The water retained in the water retaining section 232 is transferred to the disinfection tank 120 via the second transfer pipe 234 and the suction pump 240.
[0026]
For example, the cleaning operation is performed at a time suitable for performing the cleaning process of the membrane filtration device 210. In this cleaning operation, while the operation of the suction pump 240 is stopped, the amount of air supplied from the air supply pipe 221 is increased as compared with the time of the normal operation. For example, an instrument that can detect the cleaning time of the membrane filtration device 210, for example, a differential pressure gauge or a pressure gauge is used, and the air supply amount is adjusted based on information detected by the instrument. As a result, a configuration in which switching from the normal operation to the cleaning operation is automatically performed becomes possible. In this cleaning operation, the air flow of the air supplied from the air supply pipe 221 effectively acts on the filtration membrane module M, and the sludge and the like attached to the membrane surface can be separated. The water containing the sludge and the like separated from the membrane surface is discharged out of the system (outside the wastewater treatment apparatus 100 or another treatment system) by a discharge means (not shown) such as a pump.
[0027]
As described above, according to the above-described embodiment, by providing the gas-liquid separation chamber 231 in a range where the suction operation by the suction pump 240 can be performed, it is possible to achieve a configuration in which gas is difficult to move to the suction pump 240 side, The suction of the gas by the suction pump 240 in a state of being mixed with the water can be prevented as much as possible. When the gas-liquid separation chamber 231 of the present embodiment is not provided with a configuration, the gas retained in the system may bite into the suction pump, and the smooth operation of the suction pump may be hindered by cavitation or the like. However, such a problem can be solved by providing the gas-liquid separation chamber 231 in a range where the suction operation of the suction pump 240 can reach.
Further, in the present embodiment, since the gas retained in the gas-liquid separation chamber 231 is discharged to the outside of the wastewater treatment device 100 through the gas discharge pipe 235, the gas is sucked by the suction pump 240 in a state where the gas is mixed with water. Can be prevented more reliably. Further, by providing the gas discharge pipe 235, the capacity of the gas-liquid separation chamber 231 can be suppressed to a necessary limit, and the apparatus can be made compact.
[0028]
[Other embodiments]
Note that the present invention is not limited to the above-described embodiment, and various applications and modifications are conceivable. For example, each of the following embodiments to which the above embodiment is applied can be implemented.
[0029]
INDUSTRIAL APPLICABILITY The present invention can be applied to a wastewater treatment apparatus having a configuration in which a suction pump is provided in a flow path of treated water containing at least gas. In the above-described embodiment, the wastewater treatment device 100 including the membrane filtration device 210 is described. However, the present invention can be applied to, for example, a wastewater treatment device having a configuration not including such a membrane filtration device.
[0030]
Here, the configuration of a wastewater treatment apparatus 300 according to another embodiment will be described with reference to FIG. Note that among the elements in FIG. 3, the same elements as those shown in FIG. 2 are denoted by the same reference numerals.
The wastewater treatment device 300 shown in FIG. 3 has a configuration in which a separation device 230 and a suction pump 240 are disposed between an aeration tank 310 and a filtration treatment tank 320. In the aeration tank 310, an aeration process is performed by air supplied from the air supply device 220. The aerated water flows to the separator 230 and is stored in the gas-liquid separation chamber 231 in a gas-liquid separated state. The water stored in the gas-liquid separation chamber 231 is sucked by the suction pump 240 and discharged toward the filtration tank 320. That is, the suction pump 240 in this embodiment is used merely for transfer. The filtration tank 320 is provided with a filter medium 322 formed by using a carrier or a membrane for filtration, and is configured to filter sludge and the like generated by the aeration treatment by the filter medium 322. Even with such a configuration, it is possible to prevent the gas from moving to the suction pump 240 side by providing the gas-liquid separation chamber 231 in a range where the suction operation of the suction pump 240 can reach.
Further, the present invention is applicable to any wastewater treatment apparatus having a configuration in which various gases are generated in the process of treating wastewater, even if the gas such as air is not actively supplied to the system. be able to.
[0031]
Further, in the above embodiment, the aeration / filtration tank 200 for performing suction filtration is described. However, the present invention can be applied to a wastewater treatment apparatus having a configuration for performing filtration using a head difference. In this configuration, the suction pump referred to in the present invention is simply used for transfer.
[0032]
In the above embodiment, the case where the gas-liquid separation chamber 231 has both the gas-liquid separation function and the storage function has been described. However, a configuration in which the gas-liquid separation function is separated may be used. For example, it is possible to provide a gas-liquid separation means separately, and to store water and gas in a gas-liquid separation state by the gas-liquid separation means in a gas-liquid separation chamber.
[0033]
In addition, based on the description of the embodiment and the various modifications described above, the present invention can employ the following configurations.
That is, in the present invention, "a distribution path through which treated water containing gas flows, separation means for separating gas contained in treated water in this distribution path, and water after gas separation which is arranged downstream of the separation means. A wastewater treatment apparatus having a suction pump capable of sucking water, wherein a storage portion capable of storing the treated water in a gas-liquid separation state is provided in a range of the circulation path to which the suction action by the suction pump is applied. (A first aspect). " According to the first aspect, similarly to the first aspect of the invention, there is an effect that the gas in the treated water can be prevented from being sucked into the suction pump.
[0034]
Further, in the present invention, “the wastewater treatment apparatus according to claim 1, wherein the storage unit has a configuration in which the flow path diameter is larger than the front and rear flow path diameters.” (Second embodiment) is conceivable. According to the second aspect, the flow rate of the inflow water flowing into the storage chamber is reduced by expanding the flow path diameter, and the expanded flow path diameter is reduced at the outlet side of the storage chamber. As a result, the inflow water is likely to stay in the storage chamber (retention time is increased). That is, the storage section forms a chamber effective for retaining the inflow water. Such a state is effective for separating gas contained in the inflow water from the water side by gas-liquid separation.
[0035]
Further, according to the present invention, in the wastewater treatment apparatus according to claim 1, the storage section is configured to form a vertical flow path, and the storage section has a flow path that intersects the vertical direction. Wastewater treatment apparatus characterized in that inflow water flows into the wastewater treatment apparatus "(third embodiment). The “intersection” here is typically an orthogonal aspect (intersection angle of 90 degrees) by a combination of the vertical direction and the horizontal direction, but the intersection angle and the like can be variously changed as long as they intersect each other. It is. This crossing angle can be appropriately set according to the initial inflow speed of the inflow water, the desired pump efficiency, and the like. For example, by selecting an intersection angle at which it is difficult to suppress the flow, it becomes possible to reduce the resistance of the flow and suppress a decrease in pump efficiency. According to the third aspect, since the direction of the flow path in the storage unit matches the direction in which gas and water are separated (gas-liquid separation direction), gas-liquid separation can be performed rationally. Become. In addition, since the flow path in the storage chamber extends in the vertical direction, it is effective to increase the residence time effective for gas-liquid separation. Further, at the time of gas-liquid separation, cavitation in the suction pump can be suppressed more reliably by the effect of changing the flow direction of the inflow water.
[0036]
In addition, when the above-described second and third aspects are comprehensively considered, “gas-liquid separation that promotes gas-liquid separation of treated water containing gas within a range in which the suction action of the suction pump in the distribution channel is affected. A configuration with a promotion means "can be extracted. The "gas-liquid separation promoting means" can be realized by a configuration for expanding the flow path diameter of the treated water, a configuration for changing the direction of the flow path, or a configuration combining these, as described above.
[0037]
Further, according to the present invention, in the wastewater treatment apparatus according to claim 2, the storage section is configured to form a vertical flow path, and the discharge path of the gas discharge means extends in the vertical direction. (A fourth aspect). " According to the fourth aspect, the gas discharge direction coincides with the gas flow direction moving in the storage chamber in the up-down direction, so that reasonable gas discharge is possible.
[0038]
【The invention's effect】
As described above, according to the present invention, in a wastewater treatment apparatus provided with a suction pump in a flow path through which treated water containing gas flows, the gas in the treated water is prevented from being sucked by the suction pump and smoothly. Driving can be performed.
[Brief description of the drawings]
FIG. 1 is a diagram showing a configuration of a wastewater treatment apparatus 100 according to the present embodiment.
FIG. 2 is a diagram showing a configuration of an aeration / filtration tank 200 in FIG.
FIG. 3 is a diagram illustrating a configuration of a wastewater treatment apparatus 300 according to another embodiment.
[Explanation of symbols]
100 ... wastewater treatment equipment
200 ... Aeration / filtration tank
210 ... membrane filtration device
220 ... Air supply device
221 Air supply pipe
222 ... Blower
230 ... separation device
231 ... gas-liquid separation chamber
232 ... water retention section
233 ... gas retention section
235 ... Gas discharge pipe
236 ... On-off valve
240 ... Suction pump
250 ... Control device

Claims (3)

A wastewater treatment apparatus having a circulation path through which the treated water containing gas flows, and a suction pump capable of sucking the treated water in the circulation path,
A wastewater treatment apparatus having a configuration in which a storage portion capable of storing treated water in a gas-liquid separation state is provided in a range where the suction action of the suction pump extends in the circulation path. The wastewater treatment device according to claim 1,
A wastewater treatment apparatus comprising a gas discharging means for discharging gas retained in the storage section to the outside of the drainage device. The drainage treatment device according to claim 1 or 2,
A membrane filtration device disposed upstream of the storage unit, and an air supply unit capable of supplying air to the membrane filtration device,
The suction pump is configured to apply a suction force to water to be treated that is filtered by the membrane filtration device, thereby transferring the water to be treated from the membrane filtration device to the storage unit. And wastewater treatment equipment.

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