JP4776381B2 - Combined filtration device of media filtration pond and membrane filtration device - Google Patents

Description

  The present invention relates to a filtration facility suitable for various types of water treatment such as water purification treatment at a water purification plant, and more specifically, to a composite filtration device in which a membrane filtration device is incorporated in a media filtration pond.

  Conventionally, for water treatment in a water purification plant, a media filtration basin (also referred to as a media filter or simply a filtration device) in which a particulate filter medium such as sand, anthracite, or granular activated carbon is used as a filtration layer (filtration media) is generally used. However, in this media filter basin, the filtration speed is constant, that is, the treated water volume is constant. Therefore, if the treated water volume fluctuates, it is necessary to repeat operation operations such as operation / stop of the media filter basin. However, there is a problem that it is not efficient and cannot cope with an urgent increase in the amount of treated water. In recent years, membrane filtration devices have been developed as filtration devices to replace such media filtration ponds, and have become widespread mainly in small water purification plants. Since this membrane filtration device is compact, installation space is small, suspended substances and fine pathogenic protozoa can be separated, and types of membranes such as MF membrane, UF membrane, and NF membrane can be selected. By selecting, it can respond to the treatment of water to be treated of various water quality. Furthermore, since a unit-type membrane module is used, it can be freely adapted according to the treatment scale of the water to be treated, and the construction period can be shortened. Membrane filtration devices have these advantages, but the use of precision membranes causes clogging of the membrane module, necessitating chemical cleaning several times a year, and the membrane reaches its lifespan. Then, since it is necessary to replace the membrane module, there is a disadvantage that not only the apparatus cost but also the running cost is high.

  In recent years, it has become more difficult to secure large-scale investments including water treatment facilities such as water treatment plants, as well as facilities, operation, and maintenance. In addition, it is required to respond appropriately, and sufficient quality control of treated water capable of responding to changes in the quality of treated water is required, such as finely restricting the quality of treated water.

Under these circumstances, it is compact and requires only a small installation space, and can accurately and flexibly respond to fluctuations in the amount of treated water and fluctuations in the quality of treated water. For example, Patent Literature 1 discloses a media and membrane filtration combined filtration device that fuses filtration techniques using a conventional media filtration pond and a membrane filtration device as a filtration facility that can eliminate the point and is extremely excellent in water treatment efficiency. . As shown in FIG. 14 and FIG. 15, the composite filtration device is provided below the water level L of the water to be treated in the filtration tank 10 in which the filter medium layer (media) 13 of the media filtration pond 8 is arranged. The membrane filtration device (membrane) 9 in which the membrane module 9a is disposed at a position where the treated water H supplied to the filtration basin 8 is supplied to the media filtration tank 10 of the media filtration basin 8 and the membrane filtration device 9 The membrane module 9a of the membrane filtration device 9 has a device configuration in which the membrane module 9a of the membrane filtration device 8 is disposed in the upper part of the filtration tank 10 of the media filtration basin 8 or in the drainage channel so that both can be filtered simultaneously.
JP-A-2005-279408

However, simply disposing the membrane module of the membrane filtration device disclosed in Patent Document 1 above the inside of the filtration tank of the media filtration basin or in the drainage channel involves the following problems.
(1) At the time of back washing of the media filtration tank, the water inside the filtration tank of the filter basin and the drainage flow path (water to be treated) is drained, that is, filtered or drained. Since it is exposed inside, there is a risk of being adversely affected by drying or hydrophobization of the film.
(2) If the membrane module of the membrane filtration device is simply installed in the drainage flow path of the media filtration pond, the membrane module may be affected by the backwash drainage flow of the media filtration tank, and may be adversely affected such as damage. is there.
(3) When the membrane module of the membrane filtration device is simply installed in the drainage channel of the media filtration pond, the location of the membrane module is the drainage channel, and the arrangement provided for the membrane module is provided. Since this is not an installation space, there will be an extra space, and there will be an extra chemical and waste solution for chemical cleaning of the membrane module, which will increase the cost of chemical cleaning such as chemical costs, power costs, and waste disposal costs. It leads to.
(4) If the membrane module of the membrane filtration device is simply installed in the upper part of the media filtration pond, it is necessary to remove the membrane module and move it to the chemical cleaning equipment when cleaning the membrane module. A water tank for cleaning, ancillary facilities, and transportation facilities are required, leading to an increase in equipment costs and chemical cleaning costs.
(5) Since the height of the main body structure of the media filtration pond increases depending on the arrangement position of the membrane module, the construction cost of the filtration device increases.

  Therefore, an object of the present invention is to prevent drying and hydrophobization of the filtration membrane of the membrane filtration device during the reverse washing of the media filtration tank so that the membrane module is not adversely affected by the impact of the backwash drainage flow. Another object of the present invention is to provide a combined filtration device of a media filtration pond and a membrane filtration device that can suppress membrane deterioration and a decrease in filtration capacity and can reduce the chemical cleaning cost of the membrane module.

  In order to solve the above problems, the present invention employs the following configuration.

The combined filtration device of the media filtration basin and the membrane filtration device according to claim 1 includes a media filtration pond in the filtration tank and a membrane filtration device in which a membrane module is disposed in the media filtration pond, and is supplied to the media filtration pond. the water to be treated is, the filtration treatment with both the membrane filtration device with filtration media layer disposed below the filtration space of the media filtration pond, the filtration media and filtration water catchment device in the filter medium layer A combined filtration device of a media filtration pond and a membrane filtration device equipped with a drain flow path for backwash wastewater of a layer , wherein a partition wall is provided inside the filtration tank with an interval at which the membrane filtration device can be arranged is a the partition wall, the partition wall provided in the partition walls, the membrane filtration unit is disposed between the disposing space formed above the drainage channel, during backwashing of the filter material layer, the film Stop filtration of the filtration device and put the treated water in the installation space. By causing distillate, a membrane filtration device as maintain the state of being immersed in the water to be treated, and, over the partition wall from the inner wall surface of the filtration tank, the discharge flow of the backwash effluent end is open to the drain passage A trough serving as a path is provided so that the backwash waste water of the filter medium layer is not brought into contact with the membrane filtration device.

In this way, since the membrane module of the membrane filtration device is not exposed to the atmosphere during back washing of the media filtration tank, adverse effects on the membrane due to drying of the membrane and hydrophobization of the membrane are suppressed. In addition, since the backwash wastewater in the filtration tank does not directly hit the membrane module, and the membrane module is not subjected to an impact due to the flow of backwash wastewater, adverse effects such as damage to the membrane module are suppressed. In addition, since there is no need to dodge the backwash drainage flow, the membrane module can be used without the membrane space being restricted by this drainage system. Therefore, the membrane filling rate in the membrane module can be increased. That is, the installation space for the membrane filtration device can be reduced. Furthermore, since the installation space of the membrane filtration device can be used as a dedicated water tank for the membrane filtration device, chemical cleaning of the membrane module can be performed in this dedicated water tank, and the amount of chemical used, the required power, and the amount of waste liquid for cleaning are reduced. Less is enough. Thereby, it is possible to reduce the cost of chemical cleaning. Moreover, if the membrane filtration device is arranged at a relatively high position of the media filtration tank at the upper part of the drainage flow path, in addition to the above-described effect, the membrane filtration pump is not installed, only the head of the position, or The effect that membrane filtration becomes possible only by installing an auxiliary pump of a low head is also acquired.

The combined filtration device of the media filtration pond and the membrane filtration device according to claim 2 comprises a media filtration pond in the filtration tank and a membrane filtration device in which a membrane module is arranged in the media filtration pond, and is supplied to the media filtration pond. The treated water is filtered by both the filter media layer disposed in the lower part of the filtration space of the media filtration pond and the membrane filtration device, and the water collecting device for the filtered water in the filter media layer and the filter media layer It is a combined filtration device of a media filtration pond and a membrane filtration device having a drain flow path for backwash wastewater, provided with a partition wall inside the filtration tank, and provided between the partition wall and the inner wall surface of the filtration tank The membrane filtration device is disposed in an installation space formed above the drainage flow path by the partition wall, and when the filter medium layer is backwashed , the filtration of the membrane filtration device is stopped and the inside of the installation space is stopped. By leaving the water to be treated in A filter medium layer provided with a trough that can be maintained in a state immersed in treated water and that serves as a discharge channel for backwash drainage whose end is open to the drain channel from the inner wall surface of the filtration tank to the partition wall The backwash waste water is not brought into contact with the membrane filtration device .

The combined filtration device of the media filtration pond and the membrane filtration device according to claim 3 comprises a media filtration pond in the filtration tank and a membrane filtration device in which a membrane module is disposed in the media filtration pond, and is supplied to the media filtration pond. The treated water is filtered by both the filter media layer disposed in the lower part of the filtration space of the media filtration pond and the membrane filtration device, and the water collecting device for the filtered water in the filter media layer and the filter media layer A combined filtration device of a media filtration pond and a membrane filtration device having a drain flow path for backwash wastewater, wherein a first partition wall is provided inside the filtration tank , and the first partition wall and the filtration tank Forming the filtration space between the inner wall surfaces, a second partition wall having a height capable of keeping the membrane filtration device immersed in the water to be treated at the time of backwashing the filter medium layer is formed inside the first partition wall. The second partition wall is provided at a required distance from the first partition wall. Ri said formed between disposing space of the membrane filtration unit to the inside of the wall, said to form a drain passage between said first partition wall and the second partition wall, at the time of backwashing of the filter material layer, the By stopping the filtration of the membrane filtration device and leaving the treated water in the arrangement space, the membrane filtration device can be kept immersed in the treated water, and from the inner wall surface of the filtration tank. A trough serving as a drainage channel for backwashing drainage whose end is open to the drainage channel is provided across the first partition wall so that the backwashing drainage of the filter media layer does not contact the membrane filtration device. It is characterized by.

  Even if it does in this way, the same effect as the case where the above-mentioned membrane filtration device is provided above the drainage channel is acquired. In addition, the construction cost of the media filtration pond can be reduced because the height of the structure of the media filtration pond can be lowered to the same level as the height of the structure of the filtration pond in the case of media filtration alone without incorporating a membrane filtration device. Can be suppressed. However, in this case, since the position of the membrane filtration device is not as high as that provided above the drainage channel, it is difficult to perform membrane filtration using only the position head or only the auxiliary pump at the low head. It is necessary to install a membrane filtration pump. The required interval between the first partition and the second partition is an interval necessary for discharging the backwash drainage of the filtration tank without hindrance, and is a design value determined by the capacity of the filtration tank.

The combined filtration device of the media filtration basin and the membrane filtration device according to claim 4 comprises a media filtration pond in the filtration tank and a membrane filtration device in which a membrane module is arranged in the media filtration pond, and is supplied to the media filtration pond. The treated water is filtered by both the filter media layer disposed in the lower part of the filtration space of the media filtration pond and the membrane filtration device, and the water collecting device for the filtered water in the filter media layer and the filter media layer A combined filtration device of a media filtration basin and a membrane filtration device having a drain flow path for backwash wastewater, wherein a first partition wall is provided inside the media filtration pond, and the first partition wall and the filtration tank The first partition wall is formed with a second partition wall having a height so that the filtration space is formed between one inner wall surface and the membrane filtration device can be immersed in the water to be treated when the filter medium layer is backwashed. And at the required interval, this second partition wall and filtration An arrangement space for the membrane filtration device is formed between the other inner wall surfaces, and the drainage flow path is formed between the first partition wall and the second partition wall, and the reverse of the filter material layer At the time of washing, the filtration of the membrane filtration device is stopped and the treated water remains in the arrangement space, so that the membrane filtration device can be kept immersed in the treated water, and the filtration tank A trough serving as a discharge channel for the backwash drainage whose end is open to the drainage channel from the inner wall surface to the first partition wall, and contacting the backwash wastewater of the filter medium layer with the membrane filtration device It is characterized by not letting it be.

The combined filtration device of the media filtration basin and the membrane filtration device according to claim 5 is provided such that the second partition wall surrounds the periphery of the membrane filtration device, and the inside of the partition wall is disposed of the membrane filtration device. It is characterized by a space.

The combined filtration device of the media filtration basin and the membrane filtration device according to claim 6 includes a media filtration pond in the filtration tank and a membrane filtration device in which a membrane module is disposed in the media filtration pond, and is supplied to the media filtration pond. The treated water is filtered by both the filter media layer disposed in the lower part of the filtration space of the media filtration pond and the membrane filtration device, and the water collecting device for the filtered water in the filter media layer and the filter media layer It is a combined filtration device of a media filtration pond and a membrane filtration device equipped with a drainage channel for backwash wastewater, and inside the filtration tank, a partition wall is provided with an interval at which the membrane filtration device can be arranged, The partition wall and the partition wall provided between the partition walls, the membrane filtration device is disposed in a space formed above the drainage flow path, and the wall surface of the filtration tank includes a bottom portion and a side wall portion. A wall surface of the filtration tank provided with a groove wall The drain passage is formed by the groove walls, during backwashing of the filter medium layer, by residual water to be treated to the membrane filtration apparatus is filtered stop to the inter disposing space of the membrane filtration device A trough serving as a drainage channel for backwashing drainage with an end opened to the drainage channel from the partition wall is provided so as to be immersed in the water to be treated. It is made not to contact a membrane filtration apparatus.

  Even if it does in this way, the effect similar to said two composite filtration apparatus will be acquired. In this case, the reverse washing drainage path of the media filtration tank is provided on the side surface not in contact with the installation space, and is completely separated from the membrane filtration device. It is easy to install the membrane filtration device at a low position in the filtration tank without being affected by the location of the drainage discharge valve. As a result, the height of the structure of the filter basin can be reduced to the same level as in the case of the media filtration single treatment, so that the construction cost of the filtration device can be suppressed.

The combined filtration device of the media filtration pond and the membrane filtration device according to claim 7 comprises a media filtration pond in the filtration tank and a membrane filtration device in which a membrane module is arranged in the media filtration pond, and is supplied to the media filtration pond. The treated water is filtered by both the filter media layer disposed in the lower part of the filtration space of the media filtration pond and the membrane filtration device, and the water collecting device for the filtered water in the filter media layer and the filter media layer A combined filtration device of a media filtration basin and a membrane filtration device having a drain flow path for backwash wastewater, provided with a partition wall inside the filtration tank, and between the partition wall and one inner wall surface of the filtration tank The membrane filtration device is disposed in the disposed space formed on the other wall surface, and the filtration space is formed between the partition wall and the other inner wall surface of the filtration tank, and the other inner wall surface side does not contact the disposed space. A groove wall consisting of a bottom and side walls is provided on the outer wall of The drainage flow path is formed by the wall surface of the filtration tank and the groove wall portion, and when the filter medium layer is backwashed, the filtration of the membrane filtration device is stopped and the treated water remains in the installation space. By providing a trough that can maintain a state in which the membrane filtration device is immersed in the water to be treated, and that serves as a discharge channel for backwashing wastewater whose end is open to the drainage channel from the partition wall, It is characterized in that the backwash waste water of the layer is not brought into contact with the membrane filtration device .

In the combined filtration device of the media filtration pond and the membrane filtration device according to claim 8, a trough for communicating the filtration space and the drainage channel is disposed along a filling direction of the membrane module into the membrane filtration device. The end of the trough is opened to a trough provided inside the filtration tank in a direction perpendicular to the trough, and the end of the trough is opened to the drainage channel.

The combined filtration device of the media filtration basin and the membrane filtration device according to claim 9 comprises a media filtration pond of a filtration tank and a membrane filtration device in which a membrane module is disposed in the media filtration pond, and is supplied to the media filtration pond. The filtered water is filtered by both the filter medium layer disposed in the lower part of the filtration space of the media filtration pond and the membrane filtration device, and the water collecting device for the filtered water in the filter medium layer and the reverse of the filter medium layer A combined filtration device of a media filtration pond and a membrane filtration device having a drainage channel for washing wastewater, wherein a partition is provided inside the filtration tank, and the drainage channel is formed between the partitions. A groove wall portion including a bottom portion and a side wall portion is provided on the outer wall surface, and an arrangement space is formed on both sides of the filtration tank by the outer wall surface of the filtration tank and the groove wall portion, and the membrane filtration device is provided in the arrangement space. Are disposed in each of the partition and the filtration tank. The filtration space is formed between the surface and the membrane filtration device is treated by stopping filtration of the membrane filtration device and leaving treated water in the installation space when the filter medium layer is backwashed. Provide a trough that can be kept immersed in water, and from the inner wall surface of the filtration tank to serve as a discharge channel for the backwash drainage whose end is open to this drainage channel. It is made not to contact a membrane filtration apparatus.

  In the present invention, the composite filtration device incorporating the media filtration pond and the membrane filtration device is provided with an arrangement space as a dedicated water tank for the membrane filtration device in the media filtration pond. Occasionally, adverse effects on the membrane due to drying or hydrophobization of the membrane module are suppressed, and backwash wastewater does not directly hit the membrane module, eliminating adverse effects such as damage to the membrane module due to impact, the number of membranes installed and the membrane It is possible to reduce the installation space of the membrane filtration device by increasing the filling rate. In addition, since the membrane filtration device is installed in a dedicated water tank, chemical usage of the membrane module, the required power, and the amount of waste cleaning fluid can be reduced, which can reduce the cost of chemical cleaning. It becomes.

  Embodiments of the present invention will be described below with reference to the accompanying FIGS. In addition, although the following embodiment mainly describes water purification treatment as a treatment target of the composite filtration apparatus of the present invention, the present invention is not limited to water purification treatment, but in various fields such as industrial water, domestic water, and sewage. It can be applied to the treatment of various wastewater containing the generated impurities.

  FIG. 1 shows an outline of a water treatment facility equipped with a combined filtration device of a media filtration pond and a membrane filtration device of an embodiment of the present invention. FIG. 1 shows a combined filtration device of the following first embodiment in FIG. It is described. The raw water G is sent from the water source such as a river to the receiving well 1 of the water purification plant, and the raw water G stored in the receiving well 1 is supplied to the pretreatment facility A and pretreated, and then filtered as the treated water H. The water is supplied to the facility B and purified to be purified. First, the raw water G is supplied to the rapid stirring tank 2 of the pretreatment facility A. In the rapid stirring tank 2, a flocculant is added, and the raw water and the flocculant are mixed evenly by rapid stirring, and the pollutants in the raw water G are aggregated to form a floc. The raw water G after rapid stirring is supplied to the slow stirring tank 3 and gently stirred, and the flocs further aggregate and grow. Next, the raw water G is sent to the sedimentation basin 4, the grown flocs are settled and separated by gravity, and the supernatant raw water is sent to the filtration equipment B as the treated water H. In water sources where the quality of the raw water G has deteriorated due to eutrophication, etc., the raw raw water from which the floc has been separated is sent to the ozone contact tank 5 and the activated carbon adsorption tank 6 to decompose and remove the odor and organic matter. Then, the water to be treated H is sent to the composite filtration device 7 of the filtration equipment B.

  FIG. 2 shows a side view of the composite filtration device according to the first embodiment. This composite filtration device 7 is configured such that different filtration means of the media filtration basin 8 and the membrane filtration device 9 are integrally configured. is there. In the inside of the filtration tank 10 of the media filtration pond 8, a partition wall 11 is formed around the membrane filtration device 9, as shown in FIG. 3, a front perspective view of the front side of the device side shown in FIG. 11 is provided at a required interval, that is, an interval at which the membrane filtration device 9 can be disposed, and media filtration spaces 12 and 12 are formed on both sides inside the filtration tank 10. Filter media layers (media) 13 and 13 are respectively disposed in the lower portion of the media filtration space 12, and the water to be treated H passes through the filter media layers 13 and 13 and is filtered through the filter media layers 13 and 13. Collected water collecting devices 14a and 14a are provided. A water collecting flow path 14b through which treated water from the water collecting apparatus 14a circulates is provided below the partition walls 11 and 11 on the lower side of the water collecting apparatus 14a, and above the water collecting flow path 14b. The drainage flow path 16 for the backwash drainage of the filter media layers 13 and 13 is provided via the partition wall 15. In the first embodiment, the trough 17 extending from the inner wall surface 10a of the filtration tank 10 to the partition walls 11 and 11 is shown in FIG. 3 above the filter medium layers 13 and 13 of the media filtration spaces 12 and 12, respectively. As described above, a plurality of the membrane filtration devices 9 are provided in the arrangement direction, and the end portion 17 a of the trough 17 is opened to the drainage flow channel 16.

  In the first embodiment, the trough 17 extends from the inner wall surface 10a of the filtration tank 10 to the partition wall 11. However, the present invention is not limited to this, and the end portion 17a of the trough 17 is not limited to this. What is necessary is just to be comprised so that it may open | release to the drainage flow path 16, and the following other embodiment is also the same.

  The membrane filtration device 9 is a submerged membrane filtration device in which a plurality of membrane modules 9a formed of a synthetic resin or ceramic is incorporated as a unit, and the partition walls 11 and 11 and the inner wall surface 10a of the filtration tank 10 are combined. A partition wall 16a is provided above the troughs 17 and 17 provided therebetween and is disposed above the drainage flow path 16. The membrane filtration device 9 is disposed by the partition wall 16a and the pair of partition walls 11 and 11. An arrangement space 18 is formed. The arrangement position of the membrane filtration device 9 is a position where the membrane filtration device 9 is located below the water level L of the water to be treated at the time of the filtration treatment. As shown in FIG. 3, the one end side of the filtration tank 10, that is, the inflow side of the water to be treated H, was filtered with the inflow trough 19 of the water to be treated H sent from the pretreatment facility A and the media. A drainage basin 20 for the treated water is provided, a drainage basin 21 for discharging the backwash drainage of the filter medium layer 13 is provided on the other end side, and a low-head membrane filtration pump 22 is installed. The inflow tub 19 communicates with the arrangement space 18 of the membrane filtration device 9 via an openable / closable partition means (not shown), and the outflow tub 20 is similarly connected through an openable / closable partition means (not shown). And communicated with the water collecting flow path 14b. The drainage basin 21 communicates with the drainage channel 16 via an openable / closable partitioning means (not shown). In this way, the composite filtration device 7 is formed from the media filtration basin 8 and the membrane filtration device 9.

  The membrane module 9a is not limited to a hollow fiber membrane, and a membrane element such as a flat membrane or a tube can be used. In particular, when purified water is obtained as treated water, an MF membrane, a UF membrane, or the like can be suitably used. Moreover, granular filter media, such as sand, anthracite, and granular activated carbon, can be used for the filter media layer which is a medium.

  The first embodiment of the present invention is configured as described above, and the function thereof will be described below.

  The treated water H sent from the pretreatment facility A once flows into the inflow trough 19 and then flows into the arrangement space 18 of the membrane filtration device 9 by opening the partition means (not shown). , Overflows the partition walls 11 and 11 and flows into the media filtration spaces 12 and 12. The treated water H that has flowed into the media filtration spaces 12, 12 fills the drainage flow path 16 and the filtration tank 10. The water level L of the filtration tank 10 is almost the same level as the treated water H of the inflow trough 19, and the water level L is higher than the membrane filtration device 9. When the filtration process is started by operating the filtration means such as the valve of the media filtration pond 8 and the membrane filtration pump 22 of the membrane filtration device 9, the media filtration spaces 12 and 12 (media filtration pond 8) are treated. The water H passes through the filter medium layers 13 and 13 and is filtered to become treated water J1, and this treated water J1 flows out through the water collecting device 14a and the water collecting channel 14b to the outflow basin 20 and is shown in FIG. As shown in FIG. On the other hand, the to-be-treated water H that has flowed into the arrangement space 18 of the membrane filtration device 9 is sucked from the membrane module 9a by the membrane filtration pump 22 through a pipe (not shown) to become treated water J2, and enters the water purification tank P. Sent. Thus, the treated water J1 obtained by media filtration and the treated water J2 obtained by membrane filtration are collected in the clean water pond P, and the collected treated water J (J1 + J2) is tap water or the like. Used for water purification. In addition, in the filtration equipment B of FIG. 1, reference numeral 26 denotes a flow meter. By measuring the flow rate of the treated water J2 with this flow meter 26 and feeding it back to the membrane filtration pump 22, any membrane filtration flux, Or it can be adjusted to an arbitrary flow rate. Moreover, depending on the case, it can filter with the flowmeter 26 and a flow control valve (illustration omitted) using the water level difference of the filtration tank 10 and the water purification tank P. FIG.

  At the time of back washing performed to prevent the filtration efficiency from being lowered due to clogging of the filter medium layer 13 of the media filtration tank 10 and the membrane module 9a of the membrane filtration device 9, as shown in FIG. A backwash water supply pipe (not shown) is connected to the positions of * 1 and * 2 of the water supply pipes 24a and 24b for sending the treated water J1 and J2 from the washing water tank 27 to the clean water reservoir P, and the filter medium layer 13 and the membrane module 9a are supplied with cleaning water, respectively. When the filter media layer 13 is back-washed, the supply of the treated water H to the arrangement space 18 is stopped by the partition means of the inflow trough 19, and first, the treated water H is removed from the media filtration spaces 12, 12. The spill 20 is discharged. At this time, the filtration by the membrane filtration device 9 is stopped and put into a standby state, so that the treated water H remains in the arrangement space 18 and the membrane filtration device 9 is maintained in a state immersed in the treated water H. Thereafter, the cleaning water is supplied from the cleaning water tank 27 to the water collecting flow path 14b and the water collecting device 14a from the outflow basin 20, and the supplied cleaning water K causes the filter medium layers 13 and 13 to flow in the opposite direction to the filtration process. In addition, bubbling air is supplied from the blower 25 (see FIG. 1) through the air bubbling device (not shown) provided at the bottom of the filter medium layers 13 and 13 in the direction of passing the washing water. Along with this, the washing wastewater flows into the trough 17, and this washing wastewater is drained toward the drainage flow path 16 and is discharged from the drainage tank 21 to the outside of the filtration tank 10. On the other hand, when the membrane module 9a of the membrane filtration device 9 is back-washed, the washing water K from the washing water tank 27 is piped by a static pressure (differential pressure) between the washing water tank 27 and the membrane filtration device 9 (not shown). Is supplied to the membrane module 9a of the membrane filtration device 9 and back-washed. At the same time, air for bubbling is sent from the washing blower 25 that can be shared with the washing blower for the filter medium layer 13 of the media filtration pond 8 through a bubbling device (not shown) provided at the lower part of the membrane module 9a. The bubble is made to collide with the film (film surface). Then, the washing water K supplied to the membrane module 9a flows in the direction opposite to that during the filtration process, and is washed by a synergistic action with the bubbles. The washing water K passes through the membrane module 9a, finishes washing, and becomes backwashing wastewater. This backwashing wastewater flows into the media filtration spaces 12 and 12, passes through the filter media layers 13 and 13, and is returned to normal. In the same way as during filtration, the media is filtered to become treated water (purified water), which is sent to the water purification basin P through the water collecting device 14a, the water collecting flow path 14b, and the outflow basin 20. If the elevated washing water tank 27 cannot be installed, a dedicated pump for back washing of the media filtration tank 8 and the membrane filtration device 9 may be installed in the water purification tank P. When the membrane module 9a is cleaned using a chemical, the chemical solution to be used is supplied and filled in the arrangement space 18 by a portable chemical solution transfer pump, and the membrane module 9a is immersed in this chemical solution. A cleaning method, that is, a cleaning method using the arrangement space 18 of the membrane filtration device 9 as a chemical immersion tank can be employed.

  As described above, in the composite filtration device 7, excellent water treatment efficiency is obtained by performing filtration treatment using both the media filtration basin 8 and the membrane filtration device 9, and membrane filtration is performed even when the filter medium layer 13 is back-washed. Since the apparatus 9 is immersed in the water to be treated H, adverse effects on the membrane due to drying and hydrophobization of the filtration membrane are suppressed. Since the backwash drainage of the filter medium layer 13 is drained directly from the trough 17 to the drainage flow path 16, the backwash drainage does not directly hit the membrane module 9a, and the membrane module 9a is not affected by the flow of backwash drainage. In addition, adverse effects such as damage to the membrane module 9a are suppressed. Further, since there is no need to dodge the backwash drainage flow, that is, the trough 17 for discharging the wash wastewater to the drainage flow path 16 is provided below the membrane filtration device 9, so the installation space for the membrane module 9a However, it is not restricted by the arrangement of the trough 17, the installation filling rate of the membrane module 9a to the membrane filtration device 9 can be increased, and the installation space of the membrane filtration device can be reduced. Furthermore, since chemical cleaning of the membrane module can be performed in the arrangement space 18, the amount of chemical used, the required power, and the amount of cleaning waste liquid can be reduced, and the chemical cleaning cost can be suppressed. And since the arrangement | positioning position of the membrane filtration apparatus 9 becomes a comparatively high position of a media filtration pond in the upper part of the drainage flow path 16, only installing the auxiliary pump of a low head as the pump 22 for membrane filtration, Alternatively, there is also an effect that membrane filtration can be performed only by the position head without installing the membrane filtration pump 22.

  FIG. 4 shows a modification of the first embodiment. A filtration device is disposed above the drainage flow path 16 between the partition wall 11 provided inside the filtration tank 10 and the inner wall surface 10a of the filtration tank 10. Nine arrangement spaces 18 are formed. Even if it does in this way, said effect is acquired and a composite filtration apparatus can be formed more compactly according to required filtration processing capacity.

  FIG. 5 shows the combined filtration device 7a of the media filtration basin 8 and the membrane filtration device 9 of the second embodiment. The composite filtration device 7a is constructed by integrally installing different filtration means of the media filtration basin 8 and the membrane filtration device 9 in the same manner as the composite filtration device 7 shown in FIG. As shown in FIG. 6, first partition walls 11, 11 are provided in the inside of the filtration tank 10 of the media filtration tank 8 with a predetermined interval, and the media filtration space 12 is provided on both sides of the inside of the filtration tank 10. , 12 are formed. Filter media layers (media) 13 and 13 are respectively disposed in the lower portions of the media filtration spaces 12 and 12, and water to be treated H passes through the filter media layers 13 and 13 below the filter media layers 13 and 13. Water collectors 14a and 14a for filtered treated water are provided, and the treated water from the water collector 14a circulates in the lower part of the first partition walls 11 and 11 on the lower side of the water collector 14a. A water collecting channel 14b is provided. A membrane filtration device 9 is disposed above the water collecting flow path 14b via a partition wall 15, and the membrane filtration device 9 is immersed in the water to be treated H when the filter medium layer 13 is back-washed on both sides thereof. 2nd partition walls 11a and 11a of the height which can be kept in this are provided, and the arrangement | positioning space 18 of the membrane filtration apparatus 9 is formed. On both sides of the membrane filtration device 9, drainage channels 16, 16 are formed by the first partition walls 11, 11 and the second partition walls 11 a, 11 a. As in the case of the first embodiment, the trough 17 extending from the inner wall surface 10a of the filtration tank 10 to the first partition walls 11 and 11 is formed on the filter medium layers 13 and 13 as shown in FIG. A plurality of membrane filtration devices 9 are provided along the arrangement direction of the membrane filtration device 9, and an end portion 17 a of the trough 17 is opened to the drainage flow channel 16. And the inflow trough 19 of the to-be-processed water and the outflow trough 20 of the media-filtered treated water are provided in the one end side of the filtration tank 10, and the backwash waste water of the filter media layers 13 and 13 is provided in the other end side. A drainage drain 21 is provided, and a membrane filtration pump 22 is installed.

  The second embodiment of the present invention is configured as described above, and the operation thereof will be described below.

  The treated water H sent from the pretreatment facility A once flows into the inflow trough 19 and then flows into the arrangement space 18 of the membrane filtration device 9 by opening the partition means (not shown). . The treated water H flowing into the arrangement space 18 overflows the second partition walls 11a and 11a, passes through the drainage channel 16 and the plurality of troughs 17, and flows into the left and right media filtration spaces 12 and 12, The water to be treated overflows from each trough 17 and fills the media filtration spaces 12 and 12. In the same manner as in the first embodiment, the treated water H is filtered through the filter media layers 13 and 13 to obtain the treated water J1, and is filtered by suction from the membrane module 9a. The treated water J2 is obtained, and these treated waters J1 and J2 are sent to the water purification pond P, and the collected treated water J (J1 + J2) is used for water purification such as tap water.

  The reverse cleaning of the filter medium layer 13 of the media filtration tank 10, the membrane module 9a of the membrane filtration device 9, and the cleaning of the membrane module 9a using chemicals can be performed in the same manner as in the first embodiment. Also in this case, at the time of back washing, the filtration by the membrane filtration device 9 is stopped and put into a standby state, so that the treated water H remains in the arrangement space 18 and the membrane filtration device 9 is immersed in the treated water H. Can be maintained. In addition, the washing waste water of the filter medium layer 13 flows into the troughs 17 and 17 and is drained to the drain passages 16 and 16 on both sides of the arrangement space 18 and is discharged from the drainage basin 21 to the outside of the composite filtration device 7a.

  Even in this case, even when the filter medium layer 13 is back-washed, since the membrane filtration device 9 is immersed in the water to be treated, adverse effects on the membrane due to drying of the filtration membrane and hydrophobization of the membrane are prevented. . In addition, since the drainage channels 16 and 16 are provided on both sides of the arrangement space 18, the backwash wastewater does not directly hit the membrane module 9a, and the membrane module 9a is not affected by the flow of the backwash drainage. Adverse effects such as damage to the membrane module 9a are suppressed. Furthermore, the installation space of the membrane module 9a is not restricted, and therefore the installation filling rate of the membrane module 9a into the membrane filtration device 9 can be increased, and the installation space of the membrane filtration device can be reduced. As described above, the chemical cleaning cost can be suppressed.

  FIG. 7 shows a first modification of the second embodiment, and this composite filtration device 7a1 includes the second partition wall 11 provided inside the filtration tank 10 and one inner wall surface of the filtration tank 10. An arrangement space 18 of the filtration device 9 is formed above the water collecting flow path 14b between 10a. In addition, a media filtration space 12 in which a filter medium layer 13 is disposed is formed between the first partition wall 11 and the other inner wall surface 10a of the filtration tank 10, and the first partition wall 11 and the second partition wall 11a. A drainage channel 16 is formed therebetween. Even if it does in this way, the effect similar to 2nd Embodiment is acquired, and according to required filtration processing capability, a composite-filtration apparatus can be formed more compactly.

  FIGS. 8A and 8B show a second modification of the second embodiment. In this composite filtration device 7a2, the second partition wall 11a surrounds the periphery of the membrane filtration device 9. FIG. The inside of the partition wall 11 a is an arrangement space 18 for the membrane filtration device 9. Even if it does in this way, the effect similar to the case of 2nd Embodiment is acquired, and the arrangement | positioning space 18 corresponding to the capacity | capacitance of the membrane filtration apparatus 9 can be formed.

  FIG. 9 shows the combined filtration device 7b of the media filtration basin 8 and the membrane filtration device 9 of the third embodiment. In this composite filtration device 7b, similar to the composite filtration devices 7 and 7a of the first and second embodiments, different filtration means of the media filtration basin 8 and the membrane filtration device 9 are integrally configured. As shown in FIG. 10, a front perspective view thereof is provided with partition walls 11, 11 provided inside the filtration tank 10 of the media filtration basin 8 with a space at which the membrane filtration device 9 can be disposed. Media filtration spaces 12, 12 are formed on both sides inside the tank 10. Filter media layers (media) 13 and 13 are respectively disposed in the lower portion of the media filtration space 12, and the water to be treated H passes through the filter media layers 13 and 13 and is filtered through the filter media layers 13 and 13. The collected water collecting devices 14a and 14a are provided, and below the collected water device 14a, below the partition walls 11 and 11, a collected water flow path 14b through which treated water from the collected water device 14a circulates. Is provided. A membrane filtration device 9 is disposed above the water collecting flow path 14b via a partition wall 15, and an arrangement space 18 of the membrane filtration device 9 is formed by the partition walls 11 and 11 and the partition wall 15. Both outer walls 10b, 10b of the filtration tank 10 are formed with groove wall portions 23, 23 composed of a bottom portion 23a and side portions 23b, and the drainage flow path 16 is formed by the outer walls 10b, 10b and the groove wall portions 23, 23. 16 is formed on the outer wall surface 10 b side of the filtration tank 10, that is, on the side surface of the filtration tank 10 that does not contact the arrangement space 18. The drain channels 16 can also be provided on the inner wall surface 10a side. Troughs 17, 17 extend from the partition walls 11, 11 to the inner wall surfaces 10 a, 10 a of the filtration tank 10, along the arrangement direction of the membrane filtration device 9, as shown in FIG. 10. A plurality of each are provided, and an end portion 17 a of the trough 17 is opened to the drainage channel 16. And like the case of the said composite filtration apparatus 7 and 7a, the inflow trough 19 of the to-be-processed water H and the outflow trough 20 of the media-filtered treated water are provided in the one end side of the filtration tank 10, and others. On the end side, a drainage basin 21 for discharging the backwash drainage of the filter media layers 13 and 13 is provided, and a membrane filtration pump 22 is installed.

  The third embodiment of the present invention is configured as described above, and the operation thereof will be described below.

  The treated water H sent from the pretreatment facility A once flows into the inflow trough 19 and then flows into the arrangement space 18 of the membrane filtration device 9 by opening the partition means (not shown). , Overflows the partition walls 11 and 11 and flows into the media filtration spaces 12 and 12. The treated water H that has flowed into the media filtration spaces 12, 12 passes through the plurality of troughs 17, 17 and also flows into the drainage flow path 16, and the treated water H is filled in the filtration tank 10. In the same manner as in the first and second embodiments, the treated water H is obtained by filtering the treated water J1 that has passed through the filter media layers 13 and 13 and is filtered from the membrane module 9a. The treated water J2 is obtained by filtration, and these treated waters J1 and J2 are sent to the water purification tank P, and the collected treated water J (J1 + J2) is used for water purification such as tap water.

  The back filtration of the filter medium layer 13 of the media filtration tank 10, the membrane module 9a of the membrane filtration device 9, and the washing of the membrane module 9a using chemicals are performed by the combined filtration devices 7 and 7a of the first and second embodiments. This can be done in the same way as in the case of. However, in the composite filtration device 7b shown in FIGS. 6 and 7, the backwash wastewater of the filter media layers 13 and 13 is drained from the trough 17 to the drainage channels 16 provided on the outer wall 10b side of the filter tank 10, respectively. Then, it is discharged out of the composite filtration device 7b.

  Even if it does in this way, since the membrane filtration apparatus 9 exists in the state immersed in the to-be-processed water at the time of the back washing | cleaning of the filter medium layer 13, the bad influence to the film | membrane by drying of a film | membrane and hydrophobization of a film | membrane is prevented. Further, since the membrane module 9a is not affected by the flow of the backwash waste water, adverse effects such as damage to the membrane module 9a can be suppressed, and as described above, the installation filling rate of the membrane module 9a can be increased. It is possible to reduce the installation space for the filtration device, and it is possible to further reduce the chemical cleaning cost.

  FIG. 11 shows a first modification of the third embodiment. This composite filtration device 7b1 is formed between a partition wall 11 provided inside the filtration tank 10 and one inner wall surface 10a1 of the filtration tank 10, An arrangement space 18 of the membrane filtration device 9 is formed above the water collecting flow path 14b, and a media filtration space 12 is formed between the partition wall 11 and the other inner wall surface 10a2 of the filtration tank 10. And the drainage flow path 16 of the backwash waste_water | drain of the filter material layer 13 is formed in the direction of the outer side wall 10b of the other inner wall surface 10a2 side which does not contact the arrangement | positioning space 18 of the filtration tank 10. FIG. Even if it does in this way, the effect similar to 3rd Embodiment is acquired, and a composite filtration apparatus can be formed more compactly according to required filtration processing capacity.

  FIGS. 12A and 12B show a second modification of the third embodiment. This composite filtration tank device 7b2 is different from the composite filtration device 7b of the third embodiment in media filtration. The arrangement direction of the trough 17 for communicating the spaces 12, 12 and the drainage flow channel 16 is different, and the trough 17 is arranged along the filling direction of the membrane module 9a to the membrane filtration device 9. As shown in FIG. 12A, a trough 28 is provided in the filtration tank 10 in a direction perpendicular to the trough 17, and an end 17a of the trough 17 is open to the trough 28. 28 end portions 28a and 28a are opened to drainage channels 16 formed on the side surfaces of the filtration tank 10 that do not contact the arrangement space 18, respectively. Even if it does in this way, the effect similar to 3rd Embodiment is acquired, and flexibility can be given to design of a composite filtration apparatus, such as matching with installation space.

  FIGS. 13A and 13B show a third modification of the third embodiment. This composite filtration tank device 7b3 is different from the composite filtration device 7b of the third embodiment in media filtration. The arrangement position and the number of the membrane filtration devices 9 in the pond 8 and the installation position of the drainage channel 16 are different. The installation spaces 18 and 18 of the membrane filtration device 9 are formed by the outer walls 10b and 10b of the filtration tank 10 and the groove wall parts 23 and 23 formed by the bottom 23a and the side parts 23b attached to the outer walls 10b and 10b. The membrane filtration devices 9 and 9 are respectively disposed in the disposition spaces 18 and 18. In addition, media filtration spaces 12 and 12 in which filter medium layers 13 and 13 are arranged are formed between the partition walls 11 and 11 provided inside the filtration tank 10 and the inner wall surface 10a of the filtration tank 10. A drainage channel 16 is formed between the partition walls 11 and 11, and backwash drainage of the filter media layers 13 and 13 flows into the drainage channel 16 via the troughs 17 and 17. Even if it does in this way, the effect similar to 3rd Embodiment is acquired, and it has flexibility in the filtration processing capacity of a composite filtration apparatus, such as the improvement of the filtration processing capacity of a composite filtration apparatus, by extension of the membrane filtration apparatus 9. Can be made.

It is explanatory drawing which shows the outline | summary of the water purification processing equipment provided with the composite filtration apparatus of embodiment. It is explanatory drawing which shows the vertical side surface of the composite filtration apparatus of 1st Embodiment. It is a front notch perspective view of the composite filtration apparatus of FIG. It is explanatory drawing which shows the modification (vertical side surface) of 1st Embodiment. It is explanatory drawing which shows the vertical side surface of the composite filtration apparatus of 2nd Embodiment. It is a front notch perspective view of the composite filtration apparatus of FIG. It is explanatory drawing which shows the modification 1 (vertical side surface) of 2nd Embodiment. (A) It is explanatory drawing (plan view) which shows the modification 2 of 2nd Embodiment. (B) It is explanatory drawing (vertical side surface) same as the above. It is explanatory drawing which shows the vertical side surface of the composite filtration apparatus of 3rd Embodiment. It is a front notch perspective view of the composite filtration apparatus of FIG. It is explanatory drawing which shows the modification 1 (vertical side surface) of 3rd Embodiment. (A) It is explanatory drawing (plan view) which shows the modification 2 of 3rd Embodiment. (B) It is explanatory drawing (vertical side surface) same as the above. (A) It is explanatory drawing (plan view) which shows the modification 3 of 3rd Embodiment. (B) It is explanatory drawing (vertical side surface) same as the above. It is explanatory drawing which shows the vertical side surface of the composite filter apparatus of a prior art. It is explanatory drawing which shows the composite filtration apparatus of FIG. 14 typically.

1: Receiving well 2: Rapid stirring tank 3: Slow stirring tank 4: Sedimentation tank 5: Ozone contact tank 6: Activated carbon adsorption tank 7, 7a1, 7a2, 7b, 7b1-7b3: Composite filtration device 8: Media filtration tank 9 : Membrane filtration device 9a: Membrane module 10: Filtration tank 10a, 10a1, 10a2: Inner wall surface 10b: Outer wall 11: Partition wall 12: Media filtration space
13: Filter medium layer 14a: Water collecting device 14b: Water collecting channel 15: Partition 16: Drain channel 16a: Partition 17: Trough 17a: Trough end 18: Installation space 19: Inlet 20: Outlet 21: Drain 22: Pump for membrane filtration 23: Groove wall portion 23a: Bottom portion 23b: Side portions 24a, 24b: Water supply pipe 25: Blower 26: Flow meter 27: Washing water tank 28: Trough 28a: Trough end J, J1, J2: Purified water K: Wash water P: Clean water pond

Claims (9)

It consists of a media filtration pond in the filtration tank and a membrane filtration device in which a membrane module is arranged in this media filtration pond. The treated water supplied to the media filtration pond is placed below the filtration space of the media filtration pond . and both with filtration treatment of the membrane filtration device with filtration media layer, the medium is filtered pond with a drain passage of backwash waste water and filtration water catchment device with filter material layer the filter medium layer and the membrane filtration A combined filtration device of the device,
A partition wall is provided inside the filtration tank with an interval at which the membrane filtration device can be disposed, and a partition wall and a partition formed between the partition walls are formed above the drainage channel. The membrane filtration device is disposed in the installation space, and when the filter medium layer is back-washed , the filtration of the membrane filtration device is stopped and the treated water remains in the installation space, so that the membrane filtration device is covered. A filter medium layer provided with a trough that can be maintained in a state immersed in treated water and that serves as a discharge channel for backwash drainage whose end is open to the drain channel from the inner wall surface of the filtration tank to the partition wall The combined filtration device of the media filtration pond and the membrane filtration device is characterized in that the backwash waste water is not brought into contact with the membrane filtration device. It consists of a media filtration pond in the filtration tank and a membrane filtration device in which a membrane module is arranged in this media filtration pond. The treated water supplied to the media filtration pond is placed below the filtration space of the media filtration pond. A filtration medium in both the filter medium layer and the membrane filtration apparatus, and a filtration medium for filtration water in the filter medium layer and a media filtration pond and a membrane filtration apparatus having a drain flow path for backwash drainage of the filter medium layer. A combined filtration device,
A partition wall is provided in the inside of the filtration tank, and the membrane filtration device is provided in an installation space formed above the drainage flow path by the partition wall, the inner wall surface of the filtration tank, and a partition wall provided therebetween. is, during backwashing of the filter medium layer, by residual water to be treated to the membrane filtration system filtering the stops in between disposing space of, so as to maintain the membrane filtration apparatus in a state immersed in water to be treated In addition, a trough that serves as a discharge channel for the backwash drainage whose end is open to the drainage channel from the inner wall surface of the filtration tank to the partition wall is provided, and the backwash wastewater of the filter medium layer is brought into contact with the membrane filtration device. A combined filtration device of a media filtration pond and a membrane filtration device, characterized in that it is not allowed to occur. It consists of a media filtration pond in the filtration tank and a membrane filtration device in which a membrane module is arranged in this media filtration pond. The treated water supplied to the media filtration pond is placed below the filtration space of the media filtration pond. A filtration medium in both the filter medium layer and the membrane filtration apparatus, and a filtration medium for filtration water in the filter medium layer and a media filtration pond and a membrane filtration apparatus having a drain flow path for backwash drainage of the filter medium layer. A combined filtration device,
Inside the filter tank, the first partition wall is provided, said filtration space is formed between the inner wall surface of the filter tank and the first partition wall, the treated membrane filtration apparatus during backwashing of the filter medium layer a second partition wall height capable of maintaining the state of being immersed in water inside the first partition wall, and the first partition wall provided at required intervals, the film on the inside of the second partition wall Forming the arrangement space of the filtration device, forming the drainage channel between the first partition wall and the second partition wall , and stopping filtration of the membrane filtration device when the filter medium layer is backwashed And by allowing the water to be treated to remain in the arrangement space, the membrane filtration device can be kept immersed in the water to be treated, and from the inner wall surface of the filtration tank to the first partition wall, Provide a trough that serves as a drainage channel for backwash drainage with the end open to the drainage channel. Composite filtration device media filtration pond and membrane filtration apparatus, wherein a backwash effluent filter media layer so as not to contact with the membrane filtration unit. It consists of a media filtration pond in the filtration tank and a membrane filtration device in which a membrane module is arranged in this media filtration pond. The treated water supplied to the media filtration pond is placed below the filtration space of the media filtration pond. A filtration medium in both the filter medium layer and the membrane filtration apparatus, and a filtration medium for filtration water in the filter medium layer and a media filtration pond and a membrane filtration apparatus having a drain flow path for backwash drainage of the filter medium layer. A combined filtration device,
A first partition wall is provided inside the media filtration pond, the filtration space is formed between the first partition wall and one inner wall surface of the filtration tank, and a membrane filtration device is used for backwashing the filter medium layer. A second partition wall having a height that can be maintained in a state of being immersed in the water to be treated is provided at a predetermined interval from the first partition wall, and the second partition wall is disposed between the second partition wall and the other inner wall surface of the filtration tank. An arrangement space for the membrane filtration device is formed, the drainage flow passage is formed between the first partition wall and the second partition wall, and the filtration of the membrane filtration device is performed when the filter medium layer is backwashed. The membrane filtration device is kept immersed in the water to be treated by stopping the treatment water in the arrangement space, and the first partition from the inner wall surface of the filtration tank. Over the wall, it becomes the drainage channel of the backwash drainage whose end is open to the drainage channel It provided rough, composite filtration device media filtration pond and membrane filtration apparatus, wherein a backwash effluent of the filter medium layer and so as not to contact with the membrane filtration unit. The medium according to claim 3, wherein the second partition wall is provided so as to surround the periphery of the membrane filtration device, and an inner side of the partition wall is an arrangement space of the membrane filtration device. Combined filtration device of filtration pond and membrane filtration device. It consists of a media filtration pond in the filtration tank and a membrane filtration device in which a membrane module is arranged in this media filtration pond. The treated water supplied to the media filtration pond is placed below the filtration space of the media filtration pond. A filtration medium in both the filter medium layer and the membrane filtration apparatus, and a filtration medium for filtration water in the filter medium layer and a media filtration pond and a membrane filtration apparatus having a drain flow path for backwash drainage of the filter medium layer. A combined filtration device,
A partition wall is provided inside the filtration tank with an interval at which the membrane filtration device can be disposed, and a partition wall and a partition formed between the partition walls are formed above the drainage channel. The membrane filtration device is disposed in the installation space, a groove wall portion including a bottom portion and a side wall portion is provided on the wall surface of the filtration tank, and the drainage flow path is formed by the wall surface of the filtration tank and the groove wall portion. In the reverse cleaning of the filter medium layer , by stopping the filtration of the membrane filtration device and leaving the treated water in the arrangement space, the membrane filtration device can be kept immersed in the treated water, In addition, a trough serving as a drainage channel for backwashing wastewater whose end is open to the drainage channel from the partition wall is provided so that the backwashing wastewater of the filter medium layer is not brought into contact with the membrane filtration device. Combined filtration device of media filtration pond and membrane filtration device. It consists of a media filtration pond in the filtration tank and a membrane filtration device in which a membrane module is arranged in this media filtration pond. The treated water supplied to the media filtration pond is placed below the filtration space of the media filtration pond. A filtration medium in both the filter medium layer and the membrane filtration apparatus, and a filtration medium for filtration water in the filter medium layer and a media filtration pond and a membrane filtration apparatus having a drain flow path for backwash drainage of the filter medium layer. A combined filtration device,
A partition wall is provided inside the filtration tank, and the membrane filtration device is disposed in an arrangement space formed between the partition wall and one inner wall surface of the filtration tank, and the other of the partition wall and the filtration tank. The filtration space is formed between the inner wall surfaces, and a groove wall portion including a bottom portion and a side wall portion is provided on the outer wall on the other inner wall surface side that is not in contact with the arrangement space, and the wall surface of the filtration tank and the groove The drainage flow path is formed by the wall, and when the filter medium layer is backwashed, the membrane filtration device is stopped by filtering the membrane filtration device to leave the treatment water in the installation space. And a trough that serves as a discharge channel for the backwash drainage whose end is open to the drainage channel from the partition wall , so that the backwash wastewater of the filter medium layer is removed from the membrane filtration device. media filtration pond, characterized in that so as not to contact with the membrane filtration Composite filtration device location. A trough for communicating the filtration space and the drainage channel is disposed along a filling direction of the membrane module to the membrane filtration device, and an end portion of the filtration tank extends in a direction perpendicular to the trough. 8. The combined filtration device of the media filtration pond and the membrane filtration device according to claim 6 or 7, wherein the trough provided in is opened to a trough, and an end portion of the trough is opened to the drainage channel. A filter medium that consists of a media filtration pond in the filtration tank and a membrane filtration device in which a membrane module is arranged in the media filtration pond, and the treated water supplied to the media filtration pond is placed in the lower part of the filtration space of the media filtration pond Combined filtration of the filtered water in the filter medium layer and a media filtration pond and a membrane filter equipped with a drain flow path for backwash waste water of the filter medium layer In the filtration device, a partition is provided inside the filtration tank, the drainage flow path is formed between the partitions, and a groove wall part including a bottom part and a side wall part is provided on the outer wall surface of the filtration tank, An arrangement space is formed on both sides of the filtration tank by the outer wall surface of the filtration tank and the groove wall, and the membrane filtration device is provided in each of the arrangement spaces, and between the partition and the inner wall surface of the filtration tank. The filtration space is formed, and when the filter medium layer is backwashed By stopping the filtration of this membrane filtration device and leaving the treated water in the installation space, the membrane filtration device can be kept immersed in the treated water, and from the inner wall surface of the filtration tank, A media filtration basin and a membrane filtration characterized in that a trough serving as a drainage channel for backwashing drainage that is open to this drainage channel is provided so that the backwashing wastewater of the filter medium layer does not contact the membrane filtration device Combined filtration device of the device.

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