JP2010247051A - Water treatment apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technology effective for improving the water treatment efficiency in an anaerobic treatment portion in a water treatment apparatus including the anaerobic treatment portion provided with an anaerobic filter medium for performing the anaerobic treatment and filtration treatment of water to be treated. <P>SOLUTION: The water treatment apparatus 100 includes an anaerobic filter bed tank 110 which is disposed on the most upstream side of a water treatment area and whose anaerobic filter bed tank first chamber 111 is filled with the anaerobic filter medium C1 for performing the anaerobic treatment and filtration treatment of the water to be treated, a contact aeration tank 130 disposed downstream of the anaerobic filter bed tank 110, an upper area 114 disposed a filter medium 113 in the vertical direction of the first chamber 111 of the anaerobic filter bed tank 110, an lower area 115 disposed below the filter medium 113 in the vertical direction of the first chamber 111 of the anaerobic filter bed tank 110, a baffle member 120 for directly introducing raw water, which flows into the water treatment area, to the lower area 115 of the first chamber 111, and a transfer means 119 for leading out the water, which flows from the lower area 115 to the upper area 114 through the anaerobic filter medium C1, to the contact aeration tank 130. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a construction technique of a water treatment apparatus that performs water treatment of water to be treated.

Conventionally, in a water treatment apparatus that treats water to be treated such as domestic wastewater discharged from ordinary households and sewage such as industrial wastewater, a water treatment mechanism having a plurality of treatment units is accommodated in the tank body. For example, in the following Patent Document 1, a sewage treatment in which a water treatment mechanism including a primary treatment unit that performs anaerobic treatment of water to be treated and a secondary treatment unit that performs aerobic treatment of the water to be treated is housed in a tank body. An apparatus is disclosed.
By the way, in this kind of water treatment apparatus, the request | requirement regarding the disposal performance improvement of to-be-processed water is high. Therefore, the present inventors have paid particular attention to an anaerobic treatment unit that performs anaerobic treatment and filtration treatment of water to be treated, and have intensively studied a technique for improving treatment performance in the anaerobic treatment unit.
Japanese Patent Laid-Open No. 10-146592

  In the present invention, in a water treatment apparatus including an anaerobic treatment unit provided with an anaerobic filter medium for performing anaerobic treatment and filtration treatment of water to be treated, a technique effective for improving the treatment performance in the anaerobic treatment unit is provided. Is an issue.

  The present invention is configured to solve the above problems. In addition, this invention is used suitably with respect to the water treatment apparatus which purifies the to-be-processed water, such as domestic wastewater discharged | emitted from a general household etc., industrial wastewater. The “treated water” here may include water after a predetermined water treatment such as a purification treatment, or may be the water itself before the predetermined water treatment.

  A water treatment apparatus according to the present invention is an apparatus that accommodates a water treatment area of water to be treated in a treatment tank body, and the water treatment area comprises an anaerobic treatment part, an aerobic treatment part, a filter medium upper area, and a filter medium lower area The configuration includes an introduction route and a derivation latitude. The water treatment area may be configured such that further components are added to the above components. For example, a processing unit that performs solid-liquid separation processing, storage processing, disinfection processing, and the like of water to be processed can be provided in the water processing region.

  The anaerobic treatment unit is disposed at the uppermost stream of the water treatment region, and is configured as a treatment part in which the anaerobic filter material filling region is filled with an anaerobic filter material that performs anaerobic treatment and filtration of water to be treated. The aerobic treatment part is arranged downstream of the anaerobic treatment part and is configured as a treatment part that performs aerobic treatment of the water to be treated. As the aerobic processing unit, typically, a processing unit that performs aeration processing, carrier flow processing, or the like is used. The filter medium upper area is configured as an area above the anaerobic filter medium filling area in the tank vertical direction in the anaerobic treatment section. The filter medium lower area is configured as an area below the anaerobic filter medium filling area in the tank vertical direction in the anaerobic treatment section. The introduction route is configured as a route for directly introducing the raw water that has flowed into the water treatment region into the filter material lower region of the anaerobic treatment unit. Thereby, the to-be-processed water of a filter-medium lower area | region will distribute | circulate by an upward flow through an anaerobic filter medium filling area | region. The lead-out path is configured as a path for leading water that has flowed upward from the filter medium lower region to the filter medium upper region through the anaerobic filter medium to the aerobic treatment unit. In addition, regarding the introduction route and the lead-out route, the route can be configured by interior members such as a baffle member and a partition member, piping, and the like that are internally provided in the processing tank body.

  According to the above configuration, by disposing the anaerobic treatment unit at the most upstream of the water treatment region, the solid-liquid separation performance of the water to be treated in the first chamber of the water treatment region and the denitrification performance are improved. It is possible to improve. Furthermore, in this anaerobic treatment part, since the to-be-treated water passes through the anaerobic filter medium filling region in an upward flow, SS (suspended solids) contained in the water in the lower region of the filter medium passes through the anaerobic filter medium. It is easy to deposit on the bottom of the tank. Therefore, the amount of SS that passes through the anaerobic filter medium is reduced as compared with the configuration in which the region passing through the anaerobic filter medium filling region flows in a downward flow, thereby reducing the amount of SS captured by the anaerobic filter medium itself. As a result, the occurrence of partial blockage or short-circuiting in the anaerobic filter medium filling region is suppressed, and a uniform flow can be maintained over a long period of time, so that the solid-liquid separation performance of the water to be treated can be further improved. Figured.

  In the water treatment apparatus of the further form concerning this invention, it is preferable that the said anaerobic process part is the structure by which the filter medium porosity of the anaerobic filter medium was 70% or more. The “filter medium porosity” as used herein is defined as the ratio of the portion of the anaerobic filter medium that is not occupied by the filter medium component, that is, the water portion. According to such a configuration, by maintaining the filter medium porosity of the anaerobic filter medium at a certain value or more, it is possible to prevent the anaerobic filter medium from being clogged by solids and prevent the anaerobic filter medium filling region from being blocked for a long period of time. It is effective to do.

  In the water treatment apparatus of the further form concerning this invention, the said anaerobic process part is the structure by which the filter medium filling rate of the anaerobic filter medium which occupies for the effective capacity regarding the water treatment of the said anaerobic treatment part was 20 to 60%. Is preferred. Regarding the description of “effective capacity regarding water treatment of anaerobic treatment unit” here, the volume of the entire space of the anaerobic treatment unit is substantially effective for water treatment, that is, actually treated water during normal use. The volume in which is stored corresponds to the effective capacity here. Further, the “filter medium filling rate” is defined as the ratio of the space actually occupied by the anaerobic filter medium in the volume. According to such a configuration, by suppressing the filter medium filling rate to 60% or less, it is possible to prevent the anaerobic filter medium from being clogged with solids, and to maintain the filter medium filling rate to 20% or more, thereby achieving a desired anaerobic treatment. It is effective to ensure performance and filtration performance.

  In the water treatment apparatus according to a further aspect of the present invention, the guide path extends in a long shape in the vertical direction of the tank so as to define a communication space communicating between the upper area of the filter medium and the lower area of the filter medium. It is preferable that the inflow pipe of the processing tank main body is connected to the communication space of the baffle member. According to such a configuration, with respect to the introduction path for directly introducing the raw water flowing into the water treatment area into the filter material lower area of the anaerobic treatment section, the introduction path can be easily configured using a baffle member. Become.

  In the water treatment apparatus of the further form concerning this invention, it is preferable that the said baffle member is the structure by which the water area ratio of the communication space with respect to the anaerobic treatment part was 15% or more. According to such a configuration, when the water resistance in the anaerobic filter medium filling region of the anaerobic treatment part is increased by maintaining the water area ratio of the communication space of the baffle member at a certain value or more, the communication space of the baffle member It is possible to perform a buffer function that suppresses a rapid rise in water level.

  In the water treatment apparatus according to a further aspect of the present invention, the baffle member has an overflow opening that allows water in the communication space to flow directly to the upper region of the filter medium, below the inflow pipe in the vertical direction of the tank. It is preferable to have a configuration with According to such a configuration, when all or a part of the anaerobic filter material filling region of the anaerobic treatment unit is blocked, water in the communication space of the baffle member is allowed to flow out to the filter material upper region through the overflow opening. It becomes possible to prevent the inflow pipe from being submerged.

  In a further embodiment of the water treatment apparatus according to the present invention, the anaerobic treatment unit has a linear velocity of 6 m / hr of the treated water flowing through the anaerobic filter medium corresponding to the maximum flow rate of the raw water flowing into the water treatment region. It is preferable that the flow path cross-sectional area is set to be smaller. According to such a configuration, it is possible to suppress the amount of SS (suspended solids) flowing out from the anaerobic treatment unit by suppressing the linear velocity of the water to be treated flowing through the anaerobic filter medium to a certain value or less.

  As described above, according to the present invention, in the water treatment apparatus including the anaerobic treatment unit provided with the anaerobic filter medium for performing the anaerobic treatment and filtration treatment of the water to be treated, the anaerobic treatment unit is particularly arranged in the uppermost stream. In addition, by adopting a configuration in which the treated water flows through the anaerobic filter medium by upward flow, it is possible to improve the water treatment performance in the anaerobic treatment section.

  Below, the structure of the water treatment apparatus of one Embodiment in this invention is demonstrated based on metaphysics. Note that this embodiment describes a water treatment apparatus that performs water treatment of raw water (also referred to as “drainage” or “treated water”) discharged from a general household or the like.

  An outline of a water treatment apparatus 100 according to an embodiment of the “water treatment apparatus” of the present invention is shown in FIG. As shown in FIG. 1, the water treatment apparatus 100 of the present embodiment has a treatment tank body 101 formed in a tank shape, and an anaerobic filter as a water treatment region in the internal storage space of the treatment tank body 101. A floor tank 110, a contact aeration tank 130, a sedimentation tank 150, and a disinfection tank 170 are accommodated. That is, with such a configuration, wastewater that has flowed into the treatment tank main body 101 through the inflow pipe 102 is sequentially buried in the anaerobic filter bed tank 110, the contact aeration tank 130, the settling tank 150, and the disinfection tank 170 to be treated. The subsequent water flows out of the treatment tank main body 101 through the outflow pipe 103. In this case, the water treatment apparatus 100 may be configured as a purification tank that discharges the water that has flowed out of the treatment tank body 101 as it is, or the water that has flowed out of the treatment tank body 101 is used as a toilet or water for watering. It may be configured as a water reuse device to be reused. The treatment tank main body 101 here corresponds to the “treatment tank main body” in the present invention, and the anaerobic filter bed tank 110, the contact aeration tank 130, the precipitation tank 150, and the disinfection tank accommodated in the treatment tank main body 101. The “water treatment region” in the present invention is configured by the water treatment region including the water to be treated 170.

  The anaerobic filter bed tank 110 constitutes the most upstream (first chamber) treatment area in the water treatment area of the water treatment apparatus 100. The anaerobic filter bed tank 110 is configured as a treatment tank having a function of anaerobically treating (reducing) organic pollutants in the treated water and a function of filtering treated water. The anaerobic filter bed tank 110 includes an anaerobic filter bed tank 1 chamber 111 disposed in the uppermost stream and an anaerobic filter bed tank 2 chamber 112 disposed immediately downstream of the anaerobic filter bed tank chamber 111. In the anaerobic filter bed tank 111, the anaerobic filter bed 113 filled with a predetermined amount of the anaerobic filter medium C1 to which anaerobic microorganisms for anaerobic treatment of organic pollutants are attached is the filter medium upper area 114 and the filter medium lower area in the vertical direction of the tank. 115. Here, the anaerobic filter bed tank 110 or the anaerobic filter bed tank 111, the anaerobic filter bed 113 and the anaerobic filter medium C1 of the anaerobic filter bed tank 111 are respectively an “anaerobic treatment section” and “anaerobic filter medium filling” in the present invention. It corresponds to “region” and “anaerobic filter medium”. Further, the filter medium upper region 114 and the filter medium lower region 115 correspond to the “filter medium upper region” and the “filter medium lower region” in the present invention, respectively. Similarly, in the anaerobic filter bed tank 2 chamber 112, an anaerobic filter bed 116 filled with a predetermined amount of anaerobic filter medium C1 is provided between the filter medium upper area 117 and the filter medium lower area 118 in the vertical direction of the tank. . The contact aeration tank 130 which is a processing portion downstream of the anaerobic filter bed tank 110 at the most upstream corresponds to the “aerobic treatment section” in the present invention.

  The anaerobic filter bed tank 110 of the present embodiment further includes an introduction path for directly introducing the raw water flowing into the water treatment area into the filter medium lower area 115 below the anaerobic filter bed tank 1 111. This introduction path is configured using a baffle member 120 that extends in the vertical direction of the tank so as to define a communication space 121 that communicates between the filter medium upper area 114 and the filter medium lower area 115. The baffle member 120 is built in the anaerobic filter bed 1 chamber 111 of the anaerobic filter bed 110, and the inlet side opening 122 is connected to the inflow pipe 102 (corresponding to the “inflow pipe” in the present invention), while the outlet side The opening 123 is configured to be connected to the filter medium lower region 115. Accordingly, the raw water flowing in from the inflow pipe 102 is first introduced directly into the filter medium lower region 115 below the anaerobic filter bed 113 in the anaerobic filter bed tank 111 of the anaerobic filter bed tank 110. The “introduction path” in the present invention is configured by the baffle member 120 here, and the communication space 121 defined by the baffle member 120 corresponds to the “communication space” in the present invention.

  Thereafter, the water in the lower filter medium region 115 flows upward to the upper filter medium region 114 through the anaerobic filter bed 113 (anaerobic filter medium C1) by an upward flow as indicated by an arrow in FIG. At this time, the anaerobic filter bed 113 performs anaerobic treatment and filtration treatment of the water to be treated, thereby reducing BOD and removing sludge. The water after being buried in the anaerobic filter bed 113 is transferred from the filter medium upper region 114 to the downstream anaerobic filter bed tank 112 through the advection opening 111a according to the principle of the extrusion flow.

  In the anaerobic filter bed 2 chamber 112, the water in the filter medium upper area 117 flows downward to the filter medium lower area 118 through the anaerobic filter bed 116 (anaerobic filter medium C1) by a downward flow as shown by an arrow in FIG. At this time, the anaerobic filter bed 116 performs anaerobic treatment and filtration of the water to be treated, thereby reducing BOD and removing sludge. The water after being buried in the anaerobic filter bed 116 passes through a transfer means 119 extending upward from the filter medium lower region 118 to the filter medium upper region 117, and a downstream contact aeration tank 130 (aerobic treatment section). ). This transfer means 119 is typically constituted by a transfer opening through which water flows by the principle of extrusion flow, a pump transfer means including an air lift pump and related piping, and the like. Here, the advection opening 111a, the water flow path in the anaerobic filter bed 2 chamber 112, and the transfer means 119 are directed upward from the filter media lower region 115 of the anaerobic filter bed 1 chamber 111 to the filter media upper region 114 through the anaerobic filter media C1. This constitutes a deriving path for deriving the flowing water to the contact aeration tank 130 (aerobic treatment unit), and constitutes a “deriving path” in the present invention.

  Further, the baffle member 120 is directly below the inflow pipe 102 in the vertical direction of the tank, and the water in the communication space 121 flowing in from the inlet side opening 122 does not directly flow to the outlet side opening 123 side but directly into the filter medium upper region 114. An overflow opening 124 is provided to allow flow to the According to such a configuration, when all or a part of the anaerobic filter bed 113 in the anaerobic filter bed tank 111 of the anaerobic filter bed tank 110 is blocked, the water in the communication air 121 passes through the overflow opening 124 to the filter medium. Since the outflow is allowed to the upper region 114, the inflow pipe 102 can be prevented from being submerged. The overflow opening 124 here corresponds to “overflow” in the present invention. Note that the overflow opening 124 can be omitted if necessary.

  The contact aeration tank 130 is configured as a treatment tank having a function of aerobically treating (oxidizing) organic pollutants in the water to be treated. Typically, the aerobic filter bed 131 filled with a predetermined amount of the contact material C2 to which aerobic microorganisms for aerobic treatment of organic pollutants adhere is in contact with the upper side of the aerobic filter bed 131 in the vertical direction of the tank. The contact material lower region 133 is provided below the material upper region 132 and the aerobic filter bed 131. The water in the contact material upper region 132 flows downward to the contact material lower region 133 through the aerobic filter bed 131 by a downward flow as shown by an arrow in FIG. Further, the contact aeration tank 130 has a configuration in which air fed from a blower (blower) 134 is supplied to the contact material C <b> 2 via the air diffuser 135. In this configuration, the aerobic microorganisms attached to the contact material C2 aerobically treat organic pollutants in the water to be treated with the help of oxygen in the air sent from the blower 134.

  Although not specifically shown, a portion of the water aerobically treated in the contact aeration tank 130 is circulated as circulating water to the anaerobic filter bed tank 110 by a transfer means such as a transfer pump, while the rest remains. The contact material lower region 133 is transferred to the downstream sedimentation tank 150 through the transfer path 136. In this case, the circulating water circulated to the anaerobic filter bed tank 110 is typically water containing solids such as sludge.

  The sedimentation tank 150 is configured as a treatment tank having a function of temporarily retaining water transferred from the contact aeration tank 130 and precipitating and removing suspended substances in the water. The water after being treated in the settling tank 150 is transferred to the disinfection tank 170 disposed downstream through the transfer opening 151 by the principle of the extrusion flow.

  The disinfecting tank 170 is a processing tank having a function of disinfecting water flowing from the settling tank 150, and typically includes a medicine cylinder 171 filled with a solid disinfectant for performing disinfection processing. The water after the disinfection process is performed by the disinfectant eluted from the medicine cylinder 171 is discharged from the processing tank body 101 through the outflow pipe 103. In connection with this configuration, another tank, such as a discharge pump tank in which a discharge pump is installed, may be provided downstream of the disinfection tank 170.

  As described above, in the present embodiment, in particular, the anaerobic filter bed tank 110 is disposed in the uppermost stream in the water treatment region of the water treatment apparatus 100. According to such a structure, the improvement of the solid-liquid separation performance (also referred to as SS trapping performance related to SS (suspended solids)) in the anaerobic filter bed 1 chamber 111 and the denitrification performance are improved. It becomes possible to plan. Furthermore, in the anaerobic filter bed tank 110 of the present embodiment, the treated water passes through the anaerobic filter bed 113 of the anaerobic filter bed tank 1 111 in an upward flow, so The contained SS precipitates before passing through the anaerobic filter medium C1 and easily deposits on the bottom of the tank. Therefore, the amount of SS trapped in the anaerobic filter medium C1 itself is reduced by reducing the amount of SS passing through the anaerobic filter medium C1 as compared with the configuration of passing through the anaerobic filter bed 113 in a downward flow. As a result, the occurrence of partial blockage or short-circuiting of the anaerobic filter bed 113 is suppressed, and a uniform flow can be maintained over a long period of time, so that the solid-liquid separation performance of the water to be treated can be further improved. Figured.

  In order to actually confirm the operational effects obtained by the configuration in which the water to be treated passes through the anaerobic filter bed 113 of the anaerobic filter bed tank 111 in the upward flow, the first described below is the first. An evaluation experiment and a second evaluation experiment were conducted.

(First evaluation experiment)
As a first evaluation experiment, an evaluation experiment for confirming the SS capturing performance regarding SS (suspended solid) was performed. In this first evaluation experiment, a configuration in which the water to be treated passes through the anaerobic filter bed 113 in the anaerobic filter bed chamber 1 111 in an upward flow is an example, and the water to be treated is anaerobic in the anaerobic filter bed chamber 1 111. A configuration passing through the filter bed 113 in a downward flow was used as a comparative example. FIG. 2 is referred to regarding the experimental apparatus in this case. FIG. 2 schematically shows an experimental apparatus 200 according to an embodiment of the first evaluation experiment, and FIG. 3 schematically shows an experimental apparatus 300 of a comparative example according to the first evaluation experiment. ing.

(Example)
An experimental apparatus 200 according to the embodiment shown in FIG. 2 simulates an anaerobic filter bed tank 210 simulating an anaerobic filter bed tank 111 of the anaerobic filter bed tank 110 and a contact aeration tank 130 in the water treatment apparatus 100. Configured as a device including the contact aeration tank 230. That is, in the anaerobic filter bed 210 of the experimental apparatus 200, the raw water is first introduced directly into the lower part of the filter medium below the anaerobic filter bed, and then flows upward through the anaerobic filter bed (for example, the flow rate is 500 L / day). An anaerobic treatment and a filtration treatment are performed. At this time, the sludge extraction process was not performed. Further, the water treated in the anaerobic filter bed tank 210 is subjected to an aerobic treatment in the contact aeration tank 230 and a part thereof is circulated to the anaerobic filter bed tank 210.

(Comparative example)
The experimental apparatus 300 of the comparative example shown in FIG. 3 is configured as an apparatus in which the anaerobic filter bed tank 210 is changed to the anaerobic filter bed tank 310 in the experimental apparatus 200 of the embodiment, and the contact aeration tank 230 is left as it is. That is, in the anaerobic filter bed 310 of this experimental apparatus 300, the raw water is first introduced directly into the upper area of the filter medium above the anaerobic filter bed, and then flows down the anaerobic filter bed (for example, the flow rate is 500 L / day). The anaerobic treatment and the filtration treatment are carried out by the downward flow). At this time, the sludge extraction process was not performed. Further, the water treated in the anaerobic filter bed 310 is aerobically treated in the contact aeration tank 230 in the same manner as in the experimental apparatus 200 of the embodiment, and part of the water is anaerobic filter bed. It is set as the structure circulated to the tank 310. FIG.

  FIG. 4 is referred to regarding the evaluation result of the first evaluation experiment. FIG. 4 is a graph showing the relationship between the SS [mg / L] and the elapsed days T [day] in the effluent flowing out from the anaerobic filter bed of Examples and Comparative Examples as the evaluation results of the first evaluation experiment. It is shown. In FIG. 4, the plot indicated by SS1 corresponds to the example, and the plot indicated by SS2 corresponds to the comparative example. Based on the graph shown in FIG. 4, the outflow SS amount of the example is significantly lower than the outflow SS amount of the comparative example over the elapsed days, and the upper limit reference value (target value) of the outflow SS amount is always cleared. Confirmed to do. As a result, the anaerobic filter bed tank is superior in terms of SS trapping performance in the upward flow process compared to the downward flow process, and can hold a large amount of SS because sludge accumulates at the bottom of the tank. Be evaluated.

(Second evaluation experiment)
As a second evaluation experiment, an evaluation experiment was performed to confirm the influence of the passing linear velocity in the anaerobic filter bed 113 of the anaerobic filter bed chamber 1 111. In this second evaluation experiment, the amount of SS that flows out when the water to be treated is passed through the anaerobic filter bed 113 in an upward flow is changed. FIG. 5 is referred to regarding the experimental apparatus in this case. FIG. 5 schematically shows an experimental apparatus 400 according to the second evaluation experiment.

  As shown in FIG. 5, the experimental apparatus 400 is configured as an apparatus including an anaerobic filter bed tank 410 simulating the anaerobic filter bed tank 111 of the anaerobic filter bed tank 110 in the water treatment apparatus 100. In the anaerobic filter bed tank 410 of the experimental apparatus 400, the anaerobic filter bed can be filled with a skeletal spherical filter medium C1a or a net-like cylindrical filter medium C1b as an anaerobic filter medium. At this time, the height H1 of the anaerobic filter bed in the vertical direction of the tank is 250 mm, the height H2 of the upper area of the filter medium above the anaerobic filter bed is 90 mm, and the height H3 of the lower area of the filter medium below the anaerobic filter bed is 100 mm. It was. Then, after the raw water is first introduced directly into the lower part of the filter medium below the anaerobic filter bed through the inflow pipe (for example, 30φ inflow pipe), the raw water flows through the anaerobic filter bed at a predetermined linear velocity by the upward flow. Anaerobic treatment and filtration treatment are performed, and the product is discharged through an outflow pipe (for example, a 50φ outflow pipe). The linear velocity LV at this time can be changed in four stages of 4.2 [m / hr], 5.2 [m / hr], 7.0 [m / hr], and 8.4 [m / hr]. did.

  FIG. 6 is referred to for the evaluation result of the second evaluation experiment. FIG. 6 shows the relationship between the linear velocity LV [m / hr] in the anaerobic filter bed tank and the SS [mg / L] in the effluent water flowing out from the anaerobic filter bed tank as the evaluation result of the second evaluation experiment. A graph is shown. Based on the graph shown in FIG. 6, in both cases of the skeletal spherical filter medium C1a and the mesh-like cylindrical filter medium C1b, the outflow SS amount is always adjusted by adjusting the linear velocity LV to be less than 6 m / hr. It was confirmed that the upper limit reference value (target value) was cleared. Therefore, the amount of SS flowing out from the anaerobic filter bed tank can be suppressed by suppressing the linear velocity of the water to be treated flowing through the anaerobic filter medium C1 to a certain value or less. In addition, depending on the management value of the SS amount flowing out from the anaerobic filter bed tank, the linear velocity LV can be set to be lower than 6 m / hr.

  As described above, according to the present embodiment, the anaerobic filter bed tank 110 is disposed in the uppermost stream of the plurality of water treatment regions of the water treatment apparatus 100, and the water to be treated is one anaerobic filter bed tank. By being configured to pass through the 111 anaerobic filter beds 113 in an upward flow, the solid-liquid separation performance and denitrification performance of the water to be treated in the first chamber (anaerobic filter bed chamber 1 111) of the water treatment area. As a result, the water treatment performance in the anaerobic filter bed tank 110 can be improved.

  The anaerobic filter medium C1 of the anaerobic filter bed tank 110 has a configuration in which the filter medium porosity of the anaerobic filter medium C1 is 70% or more (hereinafter also referred to as “filter medium constituent requirement A”), and an anaerobic filter bed. An anaerobic filter medium C1 in the anaerobic filter bed tank 1 chamber 111 of the tank 110 has a configuration in which the filter medium filling ratio of the anaerobic filter medium C1 is 20 to 60% (hereinafter also referred to as “filter medium constituent requirement B”). Is preferred. As used herein, the description of “effective capacity relating to water treatment of the anaerobic filter bed tank 110” refers to a volume that is substantially effective for water treatment out of the capacity of the entire space of the anaerobic filter bed tank 110, that is, in actual use during normal use. The volume in which the water to be treated is stored corresponds to the effective capacity here. The “filter medium porosity” is defined as the ratio of the portion of the anaerobic filter medium C1 that is not occupied by the filter medium component, that is, the portion of water, and the “filter medium filling ratio” is actually an anaerobic filter medium C in the volume. Is defined as the percentage of space occupied by. This is particularly effective for improving the solid-liquid separation performance of the water to be treated. In addition, regarding the anaerobic filter medium C1, at least one of the above-mentioned filter medium constituent requirement A and filter medium constituent requirement B can be adopted according to the design specification of the water treatment apparatus. If necessary, the filter medium porosity of the anaerobic filter medium C1 is less than 70%, and the filter medium filling ratio of the anaerobic filter medium C1 in the effective capacity for water treatment of the anaerobic filter bed tank 110 is other than 20 to 60%. You may employ | adopt the structure set to the range.

  Further, the baffle member 120 is preferably configured such that the water area ratio of the communication space 121 of the anaerobic filter bed tank 110 to the anaerobic filter bed tank 1 chamber 111 is 15% or more. According to such a configuration, the water resistance in the anaerobic filter bed 113 of the anaerobic filter bed tank 1 111 of the anaerobic filter bed tank 110 is maintained by maintaining the water area ratio of the communication space 121 of the baffle member 120 at a certain value or more. In the case where the water flow increases, the communication space 121 of the baffle member 120 performs a buffering function that suppresses a rapid rise in water level.

[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.

  In the above-described embodiment, the anaerobic filter bed tank 110 is provided as an introduction path for directly introducing the raw water flowing into the water treatment area into the filter medium lower area 115 of the anaerobic filter bed tank 1 chamber 111 of the anaerobic filter bed tank 110. In the present invention, the introduction path only needs to be configured so as to partition the communication space 121 that communicates between the filter medium upper region 114 and the filter medium lower region 115. It is also possible to adopt another configuration other than the baffle member 120, such as piping.

  Moreover, in the said embodiment, although described about the case where the contact aeration tank 130, the sedimentation tank 150, and the disinfection tank 170 were provided as a process part downstream from the anaerobic filter bed tank 110 among the water treatment area | regions of to-be-processed water, In the present invention, if the anaerobic filter bed tank 110 is disposed at the uppermost stream of the water treatment region and the aerobic treatment unit is provided downstream thereof, the configuration of the downstream treatment part can be appropriately changed as necessary. It is. At this time, the anaerobic filter bed tank 110 only needs to include at least an anaerobic treatment section in which the treated water flows by an upward flow through the anaerobic filter medium C1, and the anaerobic filter bed tank 1 chamber 111 as in the above embodiment. In addition to the configuration in which the anaerobic filter bed 2 chamber 112 is added, a configuration in which the anaerobic filter bed 110 is composed of only the anaerobic filter bed 1 111 may be employed. As the aerobic treatment section downstream of the anaerobic filter bed tank 110, in addition to the contact aeration tank 130, a large number of carriers to which aerobic microorganisms for aerobically treating organic pollutants in the treated water can flow. It is also possible to use a carrier fluidized tank filled in the container. In this embodiment, the case where the precipitation tank 150 for performing the solid-liquid separation process is used is described. However, instead of the precipitation tank 150, a filtration tank filled with a filtration carrier is used, and the solid-liquid separation process is performed by this filtration tank. You may comprise so that it may perform.

  Moreover, in the said embodiment, although the household water treatment apparatus was described, this invention applies not only to a household water treatment apparatus but to various water treatment apparatuses installed in a factory etc. similarly. Applicable technology.

It is a figure which shows the outline | summary of the water treatment apparatus 100 of one Embodiment concerning the "water treatment apparatus" of this invention. It is a figure which shows typically the experimental apparatus 200 of the Example concerning a 1st evaluation experiment. It is a figure which shows typically the experimental apparatus 300 of the comparative example concerning a 1st evaluation experiment. It is a graph which shows the relationship between SS [mg / L] in the outflow water which flows out from the anaerobic filter bed tank of an Example and a comparative example, and elapsed days T [day] as an evaluation result of a 1st evaluation experiment. It is a figure which shows typically the experimental apparatus 400 concerning 2nd evaluation experiment. It is a graph which shows the relationship between the linear velocity [m / hr] in an anaerobic filter bed tank, and SS [mg / L] in the outflow water which flows out from an anaerobic filter bed tank as an evaluation result of a 2nd evaluation experiment.

DESCRIPTION OF SYMBOLS 100 ... Water treatment apparatus 101 ... Processing tank main body 102 ... Inflow pipe 103 ... Outflow pipe 110 ... Anaerobic filter bed tank 111 ... Anaerobic filter bed tank 1 chamber 111a ... Advection opening 112 ... Anaerobic filter bed tank 2 chambers 113, 116 ... Anaerobic filter Floor 114, 117 ... Filter medium upper region 115, 118 ... Filter medium lower region 119 ... Transfer means 120 ... Baffle member 121 ... Communication space 122 ... Inlet side opening 123 ... Outlet side opening 124 ... Overflow opening 130 ... Contact aeration tank 131 ... Good Air filter bed 132 ... Upper part of contact material 133 ... Lower part of contact material 134 ... Blower 135 ... Air diffuser 136 ... Transfer path 150 ... Precipitation tank 151 ... Advection opening 170 ... Disinfection tank 171 ... Drug cylinder 200, 300, 400 ... Experiment Apparatus 210,310,410 ... Anaerobic filter bed tank 230 ... Contact aeration tank

Claims (7)

A water treatment apparatus for accommodating a water treatment area of water to be treated in a treatment tank body,
The water treatment area is
An anaerobic treatment part that is disposed in the uppermost stream of the water treatment region and is filled with an anaerobic filter medium that performs anaerobic treatment and filtration treatment of water to be treated in an anaerobic filter material filling region;
An aerobic treatment unit that is disposed downstream of the anaerobic treatment unit and performs an aerobic treatment of water to be treated;
The filter medium upper area above the anaerobic filter medium filling area in the tank vertical direction in the anaerobic treatment part,
A filter medium lower area below the anaerobic filter medium filling area with respect to the tank vertical direction in the anaerobic treatment section, and
An introduction path for directly introducing the raw water flowing into the water treatment area into the filter medium lower area of the anaerobic treatment section;
A lead-out path for leading water that has flowed upward from the filter medium lower region to the filter medium upper region through the anaerobic filter medium, to the aerobic treatment unit;
The water treatment apparatus characterized by the above-mentioned. The water treatment device according to claim 1,
The said anaerobic treatment part is the structure by which the filter medium porosity of the said anaerobic filter medium was 70% or more, The water treatment apparatus characterized by the above-mentioned. The water treatment device according to claim 1 or 2,
The said anaerobic process part is the structure by which the filter medium filling rate of the said anaerobic filter medium occupied in the effective capacity | capacitance regarding the water treatment of the said anaerobic process part was 20 to 60%, The water treatment apparatus characterized by the above-mentioned. The water treatment apparatus according to any one of claims 1 to 3,
The introduction path includes a baffle member extending in a long shape in the tank vertical direction so as to define a communication space communicating between the filter medium upper region and the filter medium lower region,
The water treatment apparatus characterized in that the inflow pipe of the treatment tank main body is connected to the communication space of the baffle member. The water treatment device according to claim 4,
The said baffle member is the structure by which the water area ratio of the said communicating space with respect to the said anaerobic process part was 15% or more, The water treatment apparatus characterized by the above-mentioned. The water treatment device according to claim 4 or 5,
The water treatment is characterized in that the baffle member is provided with an overflow opening that allows water in the communication space to flow directly to the upper region of the filter medium, below the inflow pipe in the vertical direction of the tank. apparatus. The water treatment device according to any one of claims 1 to 6,
In the anaerobic treatment unit, the flow path cross-sectional area is set so that the linear velocity of the treated water flowing through the anaerobic filter medium is less than 6 m / hr corresponding to the maximum flow rate of raw water flowing into the water treatment area. A water treatment apparatus characterized by having a configuration.

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