JP4030824B2 - Waste water treatment apparatus and waste water treatment method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to a wastewater treatment apparatus that performs wastewater treatment, and more particularly to a technique for separating foam components from wastewater containing foam components.
[0002]
[Prior art]
  The treated water treated in the wastewater treatment facility or the like includes, for example, foam components such as detergent water discharged from ordinary households. The treated water containing such a foam component has a problem that foam is generated in the course of the treatment, and the foam thus generated is inadvertently discharged from a manhole or the like of the treatment tank. In addition, when biological treatment using microorganisms is performed in the wastewater treatment facility, there is a problem that if the concentration of foam components in the treated water is high, the microorganisms are adversely affected. From the above, there is a demand for a technique for actively separating and removing the foam component from the treated water containing the foam component in such a wastewater treatment facility. Therefore, conventionally, various techniques for separating the foam component from the waste water containing the foam component, for example, the following first to third foam separation techniques have been proposed. In the first foam separation technique, air is supplied to the wastewater containing foam components, foam is generated in the upper part of the tank by the aeration action of the air, and the foam is separated and discharged by a floss skimmer or the like. In the second foam separation technique, in a so-called air lift that transfers wastewater, foam is generated and transferred using the operating air. In the third foam separation technique, aeration air used in the aerobic treatment in the aerobic treatment tank is collected, a so-called air lift is operated by this air, and foam is generated and separated using this air lift.
[0003]
[Problems to be solved by the invention]
  However, in the first foam separation technique, the foam generated in the upper part of the tank is transferred by a water flow, so that the foam is difficult to be discharged to the floss skimmer side, and the piping and valves arranged in the upper part of the tank are not foamed (detergent residue). Etc.). In the second foam separation technique, the air lift operating air is used for the transfer of waste water and the generation and transfer of foam, so that the amount of air that can be supplied is limited and it takes time to separate the foam. Further, in the third foam separation technique, the diffused air is collected and used to generate and separate the foam. Therefore, the amount of air that can be used is limited, and it takes time to separate the foam. As a result, foam is formed in the upper part of the aerobic treatment tank, and the quality of the treated water may be deteriorated due to the foam being transferred to a subsequent treatment tank or the like.
  Then, this invention is made | formed in view of the above points, and makes it a subject to provide the waste water treatment technique effective in performing the processing of the waste_water | drain containing a foam component smoothly.
[0004]
[Means for Solving the Problems]
  In order to solve the above problems, the waste water treatment apparatus of the present invention is configured as described in claims 1 to 3, and the waste water treatment method of the present invention is as described in claim 4. In addition, the invention according to each of these claims uses a configuration in which foam and an insoluble component (gas phase) are separated in the foam separation treatment region, and a liquid phase containing only soluble oxygen is aerobically treated in the aerobic treatment region. By this, it is the technique which enabled it to aim at the smoothing of the process of the waste_water | drain containing a foam component.
[0005]
  The wastewater treatment apparatus according to claim 1 includes a foam separation treatment area, an aerobic treatment area, an air supply means, a gas-liquid separation means, a first transfer path, and a second transfer path., Circulation pathIs provided.The foam separation processing area includes a gas-liquid separation means and a first transfer path. The partition member includes a second transfer path and a circulation path.The “transfer path” in the present invention widely includes those formed by piping members, openings, and the like.
  The waste water containing the foam component discharged from a general household or the like is configured such that predetermined processing is sequentially performed in the foam separation processing area and then the aerobic processing area. That is, in the foam separation processing region, a foam separation process is performed in which foam is generated from the waste water and separated. In the aerobic treatment region, aerobic treatment is performed on the treated water after being treated in the foam separation treatment region using aerobic microorganisms or the like. By this aerobic treatment, organic pollutants and the like in the treated water are aerobically decomposed (oxidized). These foam separation treatment area and aerobic treatment area1Two tank-shaped bodies into compartmentsMaterialTherefore, it is formed by dividingHave. By providing the foam separation processing region and the aerobic processing region in one tank, for example, an opening or the like can be used in place of the piping member as a connection means between them, and therefore the configuration can be simplified. .
[0006]
  And the air supply means which forms foam by supplying air is provided in the said foam separation process area | region.
  The air supply means has a configuration for supplying air to the foam separation processing area, and a configuration in which an air diffuser or the like is connected to an air supply source such as a blower is suitably used as the air supply means. Due to the aeration action of the air supplied from the air supply means, the waste water in the foam separation processing region is foamed and foam is formed. This foam is formed on the liquid surface due to the specific gravity difference from the liquid phase. Note that this air supply amount is a value that can reliably give aeration action to the wastewater, and can prevent the treated water from being entrained in the foam after separation as much as possible. It is set as appropriate according to the content of the foam component contained.
[0007]
  The gas-liquid separation means has a configuration for separating a gas phase containing foam from other liquid phases. That is, by this gas-liquid separation means, a gas phase including foam and a liquid phase from which the gas phase is excluded are formed. As a specific aspect of this gas-liquid separation means, for example, the inlet of the piping member is immersed in a liquid surface where a gas phase caused by the air supplied from the air supply means is generated, and foam is included on the piping member side. A configuration in which the gas phase is recovered is preferably used. Thereby, the upper part of the liquid level in which the gas phase is generated is sealed by the piping member.
[0008]
  The first transfer path has a configuration for transferring the foam separated by the gas-liquid separation means to the foam transfer region. For example, a 1st transfer path can be comprised using the said piping member. The foam collected by this piping member is transferred to the foam transfer area by the gas phase flow. The foam transfer region may be a region outside the device, for example, a sewer or a septic tank, or may be upstream or downstream of the device itself. As described above, since the gas phase flow resulting from the air from the air supply means is used to transfer the foam, for example, the speed of foam transfer can be increased compared to the case of using the water flow, and the foam is generated on the liquid surface. It is possible to prevent the stagnation as much as possible. In such a wastewater treatment apparatus, pipes and valves are generally installed near the surface of the water, but the pipes and valves are foamed by facilitating the transfer of foam as in the present invention. It is possible to prevent contamination with (detergent waste etc.) as much as possible. In addition, it is possible to prevent as much as possible the foam generated in the treatment process from inadvertently flowing out from a manhole or the like, or the treated water having a high foam component concentration from adversely affecting the aerobic microorganisms used in the aerobic treatment.
[0009]
  The second transfer path has a configuration for transferring the liquid phase separated by the gas-liquid separation means to the upper part of the aerobic treatment region. As this second transfer path,foamThe opening provided in the liquid phase part of the partition member which divides a droplet separation process area | region and an aerobic process area | region is used suitably. While the liquid phase separated by the gas-liquid separation means is excluded from the gas phase, this liquid phase contains soluble oxygen (dissolved oxygen) due to the air from the air supply means. Sexual oxygen is used for aerobic treatment in the aerobic treatment region. At this time, since the gas phase separated by the gas-liquid separation means is hardly transferred to the second transfer path side, it is possible to prevent foam from being formed in the subsequent region including the aerobic treatment region. it can. In addition, since bubbles do not act directly on the contact material or the like filled in the aerobic treatment region (thing to which a biofilm such as aerobic microorganisms adheres), the attachment of a biofilm such as aerobic microorganisms is not inhibited, Further, it is possible to avoid the biofilm from peeling from the contact material or the like. As described above, the present invention is not limited to the technology of simply performing the foam separation process, but is intended to perform the foam separation process in consideration of obtaining treated water having properties suitable for aerobic treatment. It is what. Therefore, the present invention is particularly effective particularly in the organic relationship between the foam separation process and the aerobic process. As described above, according to the first aspect of the present invention, the foam and the non-dissolved component are separated in the foam separation treatment region, and the liquid phase containing only soluble oxygen is aerobically treated in the aerobic treatment region. Thereby, smoothing of the process of the waste_water | drain containing a foam component can be aimed at.
  MaCirculationThe annulus is used to treat treated water that has been aerobically treated in the aerobic treatment region.beneathFoam separation processing areaBottom ofIt has a configuration that can be circulated toTheAs this circulation path, for example, an opening formed in a partition member that partitions the aerobic processing region and the foam separation processing region is preferably used. Thereby, the processing efficiency of a foam separation process and an aerobic process can be improved by circulating a part of treated water after an aerobic process in an aerobic process area | region to a foam separation process area | region.
[0010]
  Here, the gas-liquid separation means according to claim 1 is preferably configured by immersing the inlet of the first transfer path in the liquid surface where the gas phase is generated as described in claim 2. That is, in the present invention, the first transfer path for transferring the foam also serves as the gas-liquid separation means. As a result, the upper part of the liquid level where the gas phase is generated is sealed by the first transfer path, and the foam formed on the liquid level is smoothly transferred along the first transfer path according to the gas phase flow. .
  Therefore, according to the second aspect of the present invention, it is possible to realize a rational wastewater treatment apparatus that combines the first transfer path and the gas-liquid separation means.
[0011]
  Moreover, in the waste water treatment apparatus of Claim 3, the guide member is further provided in the structure of Claim 2. The guide member guides the gas phase generated in the foam separation processing region to the first transfer path.On the other hand, the gaseous phase resulting from the air of the air supply means is prevented from being brought into the second transfer path side.And is located upstream of the first transfer path. As the guide member, a baffle member or the like that guides the flow of the gas phase so that the gas phase moves toward the first transfer path is preferably used. Accordingly, a configuration in which the gas phase is more reliably transferred to the first transfer path and the gas phase is less likely to enter the second transfer path side is possible.
[0012]
[0013]
  In the waste water treatment method according to claim 4In the same tankThe foam separation treatment of the waste water containing the foam component, and then the aerobic treatment of the treated water after the foam separation treatment. In the foam separation process, a process of generating and separating foam from waste water is performed. For this reasonAir supply means for forming foam by supplying air is provided in the region where the foam is separated.In the aerobic treatment, the treated water after the foam separation treatment is treated using an aerobic microorganism or the like. By this aerobic treatment, organic pollutants and the like in the treated water are aerobically decomposed (oxidized).
  In the first treatment step, air is supplied to the wastewater containing the foam component, and foam is formed from the wastewater by the aeration action. This air supply amount is a value that can reliably give aeration action to the wastewater, and can prevent the treated water from being entrained in the foam after separation, and is included in the wastewater. It sets suitably according to content etc. of a foam component. In the second processing step, the gas phase containing foam is separated from the other liquid phase.IeSeparate the gas phase region where the gas phase is generated from the other liquid phase regionThe partition memberCan be used to separate the gas phase and the liquid phase. In a 3rd processing step, the foam isolate | separated in the 2nd processing step is transferred to a foam transfer area | region using the gaseous-phase flow resulting from air. Thereby, since the gas-phase flow resulting from air is used to transfer the foam, for example, the transfer speed of the foam can be increased as compared with the case of using the water flow, and the foam stays on the liquid surface as much as possible. be able to. In the fourth processing step, the liquid phase separated in the second processing step is transferred to the upper part of the region where the aerobic processing is performed, and then the region where the aerobic processing is performed is lowered to perform the aerobic processing. Since this liquid phase contains soluble oxygen (dissolved oxygen) resulting from the supplied air, this dissolved oxygen is used for the aerobic treatment. At this time, since the gas phase separated in the second processing step is hardly brought to the liquid phase side, it is possible to prevent foam from being formed in the subsequent region including the aerobic processing region.
  As described above, according to the invention described in claim 4, by performing the first to fourth processing steps, it is possible to facilitate the processing of the waste water containing the foam component.
[0014]
  In the waste water treatment method according to claim 4, a part of the treated water aerobically treated in the fourth step isBy the air flow of the air supply meansIn the aerobic areaunderArea where foam separation is performed from the partBottom of(Fifth processing step). Thereby, the processing efficiency of foam separation processing and aerobic processing can be improved.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Here, FIG. 1 is a figure which shows the process in the waste water treatment equipment 100 of this Embodiment. FIG. 2 is a schematic diagram showing the configuration of the waste water treatment apparatus 100.
  In the present embodiment, waste water discharged from a general household or the like is received in the waste water treatment apparatus 100, and after the foam separation process and the aerobic treatment are performed in the waste water treatment apparatus 100, the treated water is reused. The wastewater treatment technology to be reused as water (so-called middle water) will be described. The waste water discharged from ordinary households contains foam components caused by detergents and the like.
[0016]
  As shown in FIG. 1, the waste water treatment apparatus 100 of this embodiment corresponds to the order of the waste water treatment process from the upstream side (left side of FIG. 1) from the aerobic treatment tank 110, the solid-liquid separation tank 150, the disinfection tank. 170 and a storage tank 190 are provided. The aerobic treatment tank 110 includes a foam separation processing unit 130 and an aerobic processing unit 140. The waste water treatment apparatus 100 receives, for example, waste water discharged from a general household, that is, waste water containing foam components such as detergents, first into the aerobic treatment tank 110, and then sequentially transfers the treated water to each downstream while advancing the treated water. The water after the treatment is discharged from the storage tank 190 to the outside of the system (outside the apparatus) as reused water (medium water). Thus, the waste water treatment by the waste water treatment apparatus 100 is performed continuously.
[0017]
  In the foam separation processing unit 130 of the aerobic treatment tank 110, foam is generated from the treated water containing the foam component, and then the foam is separated by a gas-liquid separation mechanism 120 (see FIG. 2) to be described later. The process which transfers to a septic tank (it respond | corresponds to the foam transfer area | region in this invention) is performed. In addition, the aerobic treatment unit 140 of the aerobic treatment tank 110 receives the treated water treated in the foam separation processing unit 130 and removes organic pollutants and the like in the treated water under aerobic conditions where oxygen is present. Aerobic treatment (oxidation) by the action of aerobic microorganisms. A part of the treated water treated by the aerobic treatment unit 140 is circulated to the foam separation treatment unit 130. In the solid-liquid separation tank 150, solid-liquid separation of suspended solids contained in the treated water treated in the aerobic treatment tank 110, so-called SS (Suspended Solid), or the like is performed. In the disinfection tank 170, the treated water treated in the solid-liquid separation tank 150 is disinfected. In the storage tank 190, temporary storage is performed before the treated water that has flowed in from the disinfection tank 170 flows out of the system as reused water (medium water).
[0018]
  The foam separated in the foam separation processing unit 130 of the aerobic treatment tank 110 and the backwash water generated during the backwash process of the solid-liquid separation tank 150 are, for example, various sewers and septic tanks provided outside the system. And discharged into a storage tank or the like. These foams and backwash water may all be discharged to the same discharge destination, or may be discharged to different discharge destinations.
[0019]
  Next, the configuration of each treatment tank constituting the waste water treatment apparatus 100 will be described in more detail with reference to FIG.
  As shown in FIG. 2, the waste water treatment apparatus 100 is formed in a single tank shape, and the tank body 101 has an inflow pipe 102 for receiving waste water, and treated water as recycled water (medium water). An outflow pipe 103 for flowing out, a discharge pipe 108 for discharging the foam separated in the foam separation processing unit 130 out of the system, and the like are provided. The discharge pipe 108 is connected to, for example, a sewer, a septic tank or the like (foam transfer region in the present invention). Inside the tank body 101, an aerobic treatment tank 110, a solid-liquid separation tank 150, a disinfection tank 170, and a storage tank 190 are formed. In the aerobic treatment tank 110, the foam separation processing unit 130 corresponds to the foam separation processing region in the present invention, and the aerobic processing unit 140 corresponds to the aerobic processing region in the present invention. Further, in the tank body 101, a partition member 104 that partitions the foam separation processing unit 130 and the aerobic processing unit 140 of the aerobic processing tank 110, and the aerobic processing tank 110 and the solid-liquid separation tank 150 are partitioned. A partition member 106 that partitions the partition member 105, the solid-liquid separation tank 150, and the storage tank 190 is provided. The storage tank 190 is provided with a partition member 107 that forms the disinfection tank 170. Also, inside the tank body 101, various pipes, valves, and the like are installed near the liquid level of each tank (not shown). In this embodiment, since the foam separation processing unit 130 and the aerobic processing unit 140 are provided in one tank, an opening or the like can be used instead of the piping member as a connecting means for both, and the configuration is thus simplified. Can be
[0020]
  The foam separation processing unit 130 is provided with a diffuser tube 112 at the bottom of the tank and a gas-liquid separation mechanism 120 at the top of the tank. This gas-liquid separation mechanism 120 corresponds to the gas-liquid separation device in the present invention.
  The air diffuser 112 is connected to an air supply source such as a blower, and has a configuration capable of supplying a predetermined amount of air from a plurality of air diffuser holes toward the wastewater containing foam components. The air supply means in the present invention is constituted by the air diffuser 112 and the blower.
[0021]
  The gas-liquid separation mechanism 120 includes a dip tube 121 and an opening 122 formed below the liquid surface between the dip tube 121 and the partition member 104. One end of the dip tube 121 is immersed below the liquid level so as to cover the liquid level of the foam separation processing unit 130, and the other end is connected to the discharge pipe 108. That is, the upper part of the foam separation processing unit 130 is sealed by the dip tube 121. The dip tube 121 and the discharge tube 108 constitute a first transfer path in the present invention. Further, the second transfer path in the present invention is constituted by the opening 122 and the like.
[0022]
  The aerobic processing unit 140 is provided with a contact material filling region 132, an air lift 134, and the like. The contact material filling region 132 is formed at a position partitioned by the upper porous member and the lower porous member, and the contact material filling region 132 is filled with a contact material C1 (fixed contact material) to which aerobic microorganisms adhere. Yes. The treated water that has flowed from the foam separation processing unit 130 descends downward in the contact material filling region 132. Note that an opening 114 that communicates the bottom of the aerobic processing unit 140 and the bottom of the foam separation processing unit 130 is formed below the partition member 104. The opening 114 has a configuration in which treated water that has passed through the contact material filling region 132 can be circulated to the foam separation processing unit 130. The circulation path in the present invention is constituted by the opening 114 and the like.
  The air lift 134 has a configuration for transferring the treated water after being treated in the aerobic treatment tank 110 to the solid-liquid separation tank 150 on the downstream side. That is, the air lift 134 includes a transfer pipe and an air supply pipe connected to the transfer pipe, and sucks and discharges treated water by an air flow of air supplied from the air supply pipe to the transfer pipe. ing.
[0023]
  The solid-liquid separation tank 150 is provided with a filter bed 152, an air lift 154, a backwash tube 156, and the like. The filter bed 152 is filled with a predetermined amount of granular carrier C2 formed in, for example, a hollow cylindrical shape. The treated water in the solid-liquid separation tank 150 moves in the filter bed 152 in the upward direction. The treated water that has passed through the filter bed 152 is transferred from the opening 106a formed in the partition member 106 to the disinfection tank 170 by the principle of so-called extrusion flow.
[0024]
  The backwash tube 156 is provided at the bottom of the solid-liquid separation tank 150. The backwash tube 156 is connected to a blower (not shown) and is configured to supply a predetermined amount of air (oxygen-containing gas) from the plurality of backwash holes into the tank by activating the blower. This blower is set to be activated during the backwash operation.
  The air lift 154 has a configuration similar to that of the air lift 134, and transports suspended solids such as SS (Suspended Solid) captured by the granular carrier C2 during normal operation and generated during the backwash operation to the outside of the system. Yes.
[0025]
  The disinfection tank 170 has a disinfection cylinder 172 installed in the tank. The disinfecting cylinder 172 is filled with a predetermined disinfectant, and the disinfectant is injected into the treated water when the treated water flowing from the solid-liquid separation tank 150 passes through the disinfecting tank 170. Yes.
[0026]
  An air lift 194 having the same configuration as the air lifts 134 and 154 is installed in the storage tank 190. The air lift 194 is configured to suck in the treated water flowing into the storage tank 190 from the disinfection tank 170 and transfer the sucked treated water out of the system from the outflow pipe 103.
  A so-called submersible pump can be used instead of the air lifts 134, 154, 194. In FIG. 2, for convenience, air is individually supplied to each air lift, but in reality, air is supplied to each air lift using a plurality of air supply pipes branched from the discharge part of one blower. It has a configuration.
[0027]
  Next, a wastewater treatment method using the wastewater treatment apparatus 100 having the above configuration will be described.
  First, after the waste water is received from the inflow pipe 102 to the foam separation processing unit 130, the supply of air to the diffuser pipe 112 is started (first processing step in the present invention). Thereby, foam B is formed from treated water by the aeration action of air, and the foam B moves to the upper part of foam separation processing part 130 according to a gaseous phase flow. At this time, most of the gas phase containing the foam B is separated to the dip tube 121 side by the separation action of the dip tube 121 and the opening 122, and the liquid phase other than the gas phase containing the foam B is separated to the opening 122 side. (Second processing step in the present invention). At this time, since the upper part of the foam separation processing unit 130 is sealed by the dip tube 121, the gas phase containing the foam B flows to the dip tube 121 and then to the discharge tube 108 according to the gas phase flow (gas flow). It is transported and discharged out of the system (sewer, septic tank, etc.) (third processing step in the present invention). Thus, in this Embodiment, since the foam B is transferred using a gaseous-phase flow (gas flow), the transfer efficiency is good compared with the conventional technique which transfers a foam using a water flow, for example. On the other hand, the other liquid phase after the gas phase containing the foam B is separated by the dip tube 121 is transferred to the aerobic treatment unit 140 through the opening 122 by the water flow caused by the air in the diffuser tube 112. Thereby, the foam component density | concentration in process water will be reduced. As described above, the foam B generated by the foam separation processing unit 130 is configured to be efficiently separated by the cooperation of the dip tube 121 and the opening 122. The opening 122 is preferably installed at a position where the foam B is unlikely to be mixed from the foam separation processing unit 130 side to the aerobic processing unit 140 side, for example, at a low distance from the liquid surface.
[0028]
  The air supply amount supplied from the air diffuser 112 is configured to be controllable by, for example, a flow rate control valve (not shown). This air supply amount is preferably set to a value that can reliably give aeration action to the wastewater and that can prevent the treated water from being entrained in the foam after separation as much as possible. . That is, when the air supply amount is large, the aeration action is easily obtained, but the treated water is easily accompanied by the foam. On the other hand, when the air supply amount is small, it is difficult for the foam to be accompanied by treated water, but it is difficult to obtain an aeration action. Therefore, it is preferable that the air supply amount be controlled so that the aeration action and the treatment water entrainment prevention action are compatible. Moreover, this air supply amount is set, for example according to content of the foam component contained in waste_water | drain.
[0029]
  In the aerobic processing unit 140, the treated water transferred from the foam separation processing unit 130 comes into contact with aerobic microorganisms attached to the contact material C1 when descending the contact material filling region 132, and the aerobic microorganisms organically treat the treated water. The pollutant is aerobically treated (oxidized) (fourth treatment step in the present invention). Note that the liquid phase transferred from the foam separation processing unit 130 to the aerobic processing unit 140 contains sufficient dissolved oxygen (dissolved oxygen) due to the air supplied from the air diffuser 112 and the like. Dissolved oxygen will promote the action of aerobic microorganisms. A part of the treated water treated by the aerobic treatment unit 140 is circulated to the foam separation treatment unit 130 through the opening 114 (fifth step), and the other is transferred to the solid-liquid separation tank 150 via the air lift 134. Is done. That is, a swirl flow as shown by an arrow in FIG. 2 is formed between the foam separation processing unit 130 and the aerobic processing unit 140 through the opening 114 and the opening 122. In this way, it is possible to improve the processing efficiency of the foam separation process and the aerobic process by circulating (turning) a part of the treated water processed by the aerobic processing unit 140 to the foam separation processing unit 130. Become.
[0030]
  In the solid-liquid separation tank 150, the solid-liquid separation process of the treated water transferred from the aerobic processing part 140 is performed. The solid-liquid separation tank 150 includes a normal operation mainly for solid-liquid separation and a backwash operation for discharging the separated solid.
  In normal operation, the treated water that has flowed in is passed through the granular carrier C2 of the filter bed 152 to filter the treated water, and the SS in the treated water is captured by the granular carrier C2. That is, when the treated water in the solid-liquid separation tank 150 passes through the filter bed 152 in the upward direction, it is filtered by the particulate carrier C2, and suspended solids such as SS (Suspended Solid) contained in the treated water. It will be captured by the granular carrier C2. This SS mainly occurs when the organic pollutant is aerobically decomposed (oxidized) by aerobic microorganisms in the aerobic processing unit 140.
[0031]
  On the other hand, in the backwash operation, the backwash process of the solid-liquid separation tank 150 is performed. In this backwash operation, the SS captured by the granular carrier C2 is peeled off from the granular carrier C2 and discharged out of the system. During this backwash operation, air supply is started from the plurality of backwash holes of the backwash tube 156. When air is supplied from the backwash tube 156 into the solid-liquid separation tank 150, a gas-liquid mixed phase flow of water flow and air flow (bubbles) is formed in the solid-liquid separation tank 150, and the treated water is uniformly bubbled ( Stirring). At this time, the SS captured by the granular carrier C2 is peeled off. The backwash water containing the SS is discharged out of the system via the air lift 154.
[0032]
  The treated water treated in the solid-liquid separation tank 150 during normal operation is transferred to the disinfection tank 170 through the opening 106a. In the sterilization tank 170, the sterilization treatment of the treated water is performed by the disinfectant filled in the sterilization cylinder 172. And the treated water disinfected in the disinfection tank 170 is once stored in the storage tank 190, and this stored water is transferred out of the system through the air lift 194. Note that the concentration of foam components and organic pollutants is reduced in this stored water, and in this embodiment, this stored water is used as reused water (medium water), for example, toilet flushing water. In addition, “medium water” as used herein is dilute water having a residual sewage concentration, and is intermediate water between clean water (drinking water) and sewage having a high residual sewage concentration. What is used for washing water, miscellaneous water, industrial water, etc. As described above, the waste water treatment apparatus 100 according to the present embodiment has a mechanism for treating waste water, and also has a function of producing reused water (medium water).
[0033]
  As described above, according to the present embodiment, in order to separate the gas phase containing the foam B from the other liquid phase using the gas-liquid separation mechanism 120, the air supplied from the air diffuser 112 is subjected to foam separation. Can be used for the subject. Therefore, foam generation, separation, and transfer can be performed efficiently. Further, by facilitating the transfer of the foam, it is possible to prevent as much as possible that the pipes, valves, and the like disposed on the upper part of the foam separation processing unit 130 are contaminated with foam (detergent residue). In addition, it is possible to prevent as much as possible the foam generated in the treatment process from inadvertently flowing out from a manhole or the like, or the treated water having a high foam component concentration from adversely affecting the aerobic microorganisms used in the aerobic treatment.
  Further, according to the above embodiment, since the bubbles do not act directly on the contact material C1, the adhesion of the biofilm such as aerobic microorganisms is not inhibited, and the biofilm is separated from the contact material C1. It can be avoided.
  Moreover, according to the said embodiment, the production | generation of the foam in the downstream of the foam separation process part 130 and a water quality fall can be suppressed as much as possible.
  Further, the processing efficiency of the foam separation process and the aerobic process can be improved by circulating a part of the treated water after the aerobic process in the aerobic processing unit 140 to the foam separation processing unit 130.
  In addition, according to the above embodiment, by performing the foam separation treatment and the aerobic treatment together, not only the foam component concentration but also the organic pollutant concentration can be reduced, so that the treated water is treated with the organic pollutant. It can be used as dilute medium water.
[0034]
  [Other Embodiments]
  In addition, this invention is not limited only to said embodiment, A various application and deformation | transformation can be considered. For example, each of the following embodiments to which the above embodiment is applied can be implemented.
[0035]
  (A) Another constituent requirement as shown in FIG. 3 may be given to the foam separation processing unit 130 of the above embodiment. Here, FIG. 3 is a partially enlarged view showing another embodiment of the foam separation processing unit 130.
  In the embodiment shown in FIG. 3, a baffle member 200 is provided upstream of the dip tube 121 (a position below the opening 122 in FIG. 3). The baffle member 200 is constituted by a plate-shaped piece, and guides the gas phase caused by the air supplied from the diffuser tube 112 to the dip tube 121 side, while the gas phase caused by the air supplied from the diffuser tube 112 is generated. It is prevented from being brought into the opening 122 side. The baffle member 200 corresponds to the guide member in the present invention. By providing such a baffle member 200, a configuration in which the gas phase is more reliably separated and discharged and the gas phase is less likely to be mixed downstream from the foam separation processing unit 130 is possible.
[0036]
  (B) In the above embodiment, the case where the contact material filling region 132 of the aerobic treatment unit 140 is filled with the fixed contact material C1 is described. However, the flowable granular material can be used instead of the contact material C1. A carrier can also be used.
[0037]
  (C) Moreover, in the said embodiment, although the waste water treatment apparatus 100 provided with the aerobic treatment tank 110, the solid-liquid separation tank 150, the disinfection tank 170, and the storage tank 190 was described, it is a kind different from these treatment tanks. It is also possible to incorporate a treatment tank. For example, a contaminant removal tank that performs solid-liquid separation can be provided upstream of the aerobic treatment tank 110.
[0038]
  (D) In the above embodiment, the case where the wastewater treatment is performed in a continuous manner using a plurality of treatment tanks has been described. However, for example, a configuration in which the wastewater treatment is performed in a batch manner (batch manner) can also be used. .
[0039]
【The invention's effect】
  As described above, according to the present invention, it is possible to realize an effective wastewater treatment technique for smoothly treating wastewater containing foam components.
[Brief description of the drawings]
FIG. 1 is a diagram showing treatment steps in a wastewater treatment apparatus 100 of the present embodiment.
FIG. 2 is a schematic diagram showing a configuration of the waste water treatment apparatus 100. FIG.
FIG. 3 is a partially enlarged view showing another embodiment of the foam separation processing unit 130. FIG.
[Explanation of symbols]
  100 ... Waste water treatment equipment
  110 ... Aerobic treatment tank
  112 ... Diffuser
  114, 122 ... opening
  120: Gas-liquid separation mechanism
  121 ... Dip tube
  130: Foam separation processing unit
  132 ... Contact material filling region
  140 ... aerobic processing part
  150 ... Solid-liquid separation tank
  170 ... Disinfection tank
  190 ... Reservoir
  200 ... Baffle member
  B ... Foam
  C1 ... Contact material

Claims (4)

A foam separation treatment region that receives wastewater containing foam components and performs foam separation processing, and an aerobic treatment region that performs aerobic treatment of treated water after being treated in this foam separation treatment region in the same tank A wastewater treatment apparatus comprising a partition member that partitions the foam separation treatment region and the aerobic treatment region ,
Provided air supply means for forming a foam by supplying et ah to the foam separation processing region,
The foam separation processing region includes a gas-liquid separation unit that separates the gas phase containing the foam and a liquid phase other than the gas phase, and a gas-phase flow caused by the air from the foam separated by the gas-liquid separation unit. using a first transfer path for transferring the foam transfer region,
The partition member is aerobically treated by lowering the aerobic treatment region with a second transfer path for transferring the liquid phase separated by the gas-liquid separation means to the upper part of the aerobic treatment region. A circulation path communicating between the lower part of the foam separation treatment area and the lower part of the aerobic treatment area so that treated water can be circulated from the aerobic treatment area to the foam separation treatment area by the air flow of the air supply means ; A wastewater treatment apparatus comprising: A wastewater treatment apparatus according to claim 1,
The waste water treatment apparatus, wherein the gas-liquid separation means is configured by immersing an inlet of the first transfer path in a liquid surface where the foam is generated. A wastewater treatment apparatus according to claim 2,
Upstream of the first transfer path, the gas phase generated in the foam separation processing region is guided to the first transfer path, while the gas phase caused by the air of the air supply means is transferred to the second transfer path. A wastewater treatment apparatus, characterized in that a guide member is provided to prevent the introduction to the path side . In the same tank, it is a wastewater treatment method that accepts wastewater containing foam components and performs foam separation treatment, and then aerobic treatment of this treated water,
Air supply means for forming foam by supplying air is provided in the region where the foam is separated,
A first treatment step of forming foam by supplying air to the waste water;
A second processing step for separating the gas phase containing the foam and the other liquid phase;
A third processing step of transferring the foam separated in the second processing step to a foam transfer region using a gas phase flow caused by the air;
A fourth processing step in which the liquid phase separated in the second processing step is transferred to the upper part of the aerobic processing region and then the aerobic processing region is lowered to lower the aerobic processing region;
A part of treated water aerobically treated with the fourth process step, the fifth circulating the air flow of said air supply means to the bottom of the area to be foam separation process from the bottom of the region for the aerobic treatment A wastewater treatment method comprising the steps of:

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