JP7216542B2 - Waste water treatment device, membrane element and waste water treatment method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a wastewater treatment apparatus, a membrane element, and a wastewater treatment method.

Conventionally, a membrane separation activated sludge method that treats wastewater such as sewage using a microfiltration membrane (MF (Microfiltration) membrane) or an ultrafiltration membrane (UF (Ultrafiltration) membrane) is known as a wastewater treatment method ( For example, see Patent Documents 1 to 3.).

In the membrane separation activated sludge process, biological treatment is performed to remove organic matter dissolved in wastewater (hereinafter referred to as "dissolved substances"), and contaminants dispersed in wastewater are removed by MF or UF membranes. A membrane filtration process is performed to separate and remove wastewater from the wastewater, and then the wastewater that has been subjected to the biological treatment and the membrane filtration process is discharged into a river or the like.

JP-A-62-180704 JP-A-7-185269 JP-A-10-015573

However, membrane filtration using MF and UF membranes must be performed after biological treatment has been performed to remove soluble substances from the wastewater, since MF and UF membranes do not capture soluble substances. Therefore, there is a demand for realization of wastewater treatment that performs membrane filtration using a membrane that captures soluble substances without performing biological treatment.

That is, conventionally, there is a problem that membrane filtration treatment using membranes that do not require biological treatment cannot be performed.

An object of the present invention is to provide a wastewater treatment apparatus, a membrane element, and a wastewater treatment method capable of performing membrane filtration using a membrane that does not require biological treatment.

In order to achieve the above object, the wastewater treatment apparatus of the present invention is disposed between wastewater containing contaminants, soluble substances and water, and a driving solution containing water and other than the wastewater, and A disk-shaped removing means having a rotating shaft for removing the contaminants and soluble substances and permeating the water contained in the waste water to the driving solution; and a flow path for the driving solution is formed inside the removing means. and a disc-shaped forming means for forming a disk, wherein a gap is formed between the removing means and the forming means in the outer edge portion and the surface portion of the forming means .

In order to achieve the above object, the membrane element of the present invention is disposed between waste water containing contaminants, dissolved substances and water, and a driving solution containing water and other than the waste water, A disc-shaped removing means having a rotating shaft for removing contaminants and soluble substances and permeating the water contained in the waste water to the driving solution; and forming a flow path for the driving solution inside the removing means . A disk-shaped forming means is provided, and a gap is formed between the removing means and the forming means in the outer edge portion and the surface portion of the forming means .

In order to achieve the above object, the wastewater treatment method of the present invention is disposed between wastewater containing contaminants, soluble substances and water and a driving solution containing water and other than the wastewater, A disk-shaped removing means having a rotating shaft for removing the contaminants and soluble substances and permeating the water contained in the waste water to the driving solution ; and a flow path for the driving solution is formed inside the removing means. and a disk-shaped forming means for performing a wastewater treatment method, wherein a gap is formed between the removing means and the forming means in the outer edge portion and the surface portion of the forming means . a supplying step of supplying the driving solution to the inside of the removing means; a removing step of removing the contaminants and the soluble substances from the waste water; It is characterized by comprising a mixing step of mixing with a driving solution, and a collecting step of collecting the driving solution and moisture mixed with the driving solution.

According to the present invention, membrane filtration can be performed using membranes that do not require biological treatment.

BRIEF DESCRIPTION OF THE DRAWINGS It is a block diagram which shows roughly the waste water treatment apparatus which concerns on embodiment of this invention. FIG. 2 is a diagram used to explain the FO membrane module in FIG. 1, FIG. 2A shows a plan view of a plurality of FO membrane modules that the membrane filtration processing unit has, and FIG. 2B shows the membrane filtration processing unit. shows a front view of a plurality of FO membrane modules, and FIG. 2(C) is a diagram used to explain the rotary shaft flow paths of the rotary shafts in FIGS. 2(A) and 2(B). FIG. 2B is a cross-sectional view of the FO membrane element taken along line AA in FIG. 2B; FIG. 4 is a diagram used to explain a modification of the FO membrane element of FIG. 3; 2 is a flow chart showing a procedure of waste water treatment performed by the waste water treatment apparatus of FIG. 1; FIG. 3 is a schematic diagram used to explain a first modification of the FO membrane element in FIG. 2(B); FIG. 7 is a diagram used to explain a first modification of the FO membrane element of FIG. 6; FIG. 7 is a diagram used to explain a second modification of the FO membrane element of FIG. 6; FIG. 2B is a diagram used to explain a second modification of the FO membrane element of FIG. 2B;

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram schematically showing a waste water treatment apparatus 10 according to an embodiment of the invention.

The waste water treatment apparatus 10 in FIG. 1 includes a separation removal unit 11 in which a screen (not shown) for separating and removing large contaminants contained in the waste water is installed, and waste water from which the large contaminants have been separated and removed. Equipped with a membrane filtration processing unit 12 for membrane filtration, the membrane filtration processing unit 12 has a plurality of membrane modules, for example, FO (Forward Osmosis) membrane modules 13, and each FO membrane module 13 has large contaminants separated and removed, It is immersed in the waste water sent from the separation/removal unit 11 to the membrane filtration processing unit 12 . The wastewater treatment apparatus 10 also includes a driving solution supply unit 14 that supplies a driving solution DS (Draw Solution) such as seawater to the FO membrane module 13 .

2A and 2B are diagrams used for explaining the FO membrane module 13 in FIG. 1, and FIG. 2(B) shows a front view of a plurality of FO membrane modules 13a and 13b that the membrane filtration processing unit 12 has, and FIG. It is a figure used in order to demonstrate the rotating shaft flow path 24 which has.

2(A), 2(B) and 2(C), the FO membrane modules 13a and 13b have a plurality of disk-shaped FO membrane elements 21a and 21b, and the FO membrane elements 21a and 21b are spaced apart at regular intervals. FO membrane elements 21a and 21b are provided with FO membranes 23 (removing means).

When the FO membrane 23 is interposed between a solution α having a predetermined solute concentration and a solution β having a higher solute concentration than the solution α, a load other than the osmotic pressure generated on the FO membrane 23 based on forward osmosis is applied. captures solutes in solution α without At this time, the solvent of the solution α passes through the FO membrane 23 and is mixed with the solution β. In this embodiment, the FO membrane 23 is arranged so as to be interposed between the waste water and the driving solution DS, and the solute concentration of the driving solution DS is adjusted to be higher than that of the waste water. Therefore, the pressure that the FO membrane 23 receives from the waste water is higher than the pressure that the FO membrane 23 receives from the driving solution DS, and water in the waste water passes through the FO membrane 23 and is mixed with the driving solution DS. At this time, since the FO membrane 23 generally has the ability to block substances with a molecular weight exceeding about 100, it captures not only contaminants in the wastewater, but also soluble substances that conventionally had to be removed by biological treatment. do. Note that the water that has permeated the FO membrane 23 is collected together with the driving solution DS and discharged from the membrane filtration processing unit 12 (FIG. 1).

The FO membrane modules 13a and 13b are arranged such that the FO membrane elements 21a and 21b are alternately arranged and the FO membrane elements 21a and 21b overlap when the FO membrane modules 13a and 13b are viewed from the front. The FO membrane modules 13a, 13b are configured to rotate around the rotation shafts 22a, 22b and to rotate separately.

The rotating shafts 22a and 22b have a rotating shaft flow path 24 for circulating the driving solution DS supplied from the driving solution supply unit 14 therein. A driving solution DS is supplied to the FO membrane elements 21a and 21b from one end of the rotary shaft flow path 24 (hereinafter referred to as a "driving solution supply end 24a"), and moisture permeating through the FO membranes 23 of the FO membrane elements 21a and 21b is removed. and the driving solution DS is collected at the other end of the rotating shaft channel 24 (hereinafter referred to as "mixed liquid collection end 24b").

FIG. 3 is a cross-sectional view of the FO membrane element 21a along line AA in FIG. 2(B).

The FO membrane element 21a of FIG. 3 has an internal space 31 closed by the FO membrane 23, and the internal space 31 has a disk-shaped baffle plate 32 (forming means). The baffle plate 32 has a driving solution contact surface 32a with which the driving solution DS supplied to the internal space 31 of the FO membrane 23 via the driving solution supply end 24a first contacts, and the back surface of the driving solution contact surface 32a. and a driving solution guiding surface 32b. A gap exists between the baffle 32 and the FO membrane 23 , and an outer edge gap 33 exists between the outer edge of the baffle 32 and the FO membrane 23 .

When the driving solution DS is supplied to the inner space 31 of the FO membrane 23 , the driving solution DS reaches the baffle plate 32 and then advances along the driving solution contact surface 32 a to the outer edge gap 33 . After that, the driving solution DS passes through the outer edge gap 33 and advances along the driving solution guiding surface 32b to the mixed solution collecting end 24b. At this time, water in the waste water permeates the FO membrane 23 and moves into the internal space 31 of the FO membrane 23 , and is mixed with the driving solution DS moving in the internal space 31 of the FO membrane 23 .

By the way, the driving solution DS is supplied from the driving solution supply end 24a to the internal space 31 of the FO membrane 23, and the mixed liquid of the water permeating the FO membrane 23 and the driving solution DS is collected at the mixed liquid collection end 24b. Although the configuration of the membrane elements 21a and 21b has been described, the supply of the driving solution DS and the collection of the liquid mixture may be performed separately in the FO membrane elements 21a and 21b.

Specifically, the FO membrane module 13a includes an FO membrane element 21a and an FO membrane element 21a' adjacent to the FO membrane element 21a. , the internal space 31 has a baffle plate 32 . The FO membrane elements 21a and 21a' also have a supply pipe 34 for supplying the driving solution DS to the internal space 31 and a water collecting pipe 35 for collecting the mixed solution (FIG. 4). When the supply pipe 34 supplies the driving solution DS to the internal space 31 , the driving solution DS advances along the baffle plate 32 and advances to the water collection pipe 35 as a mixed solution while scooping up the water permeated through the FO membrane 23 . The water collection pipe 35 is communicated with the FO membrane elements 21a and 21a'. For example, the mixed liquid collected by the FO membrane element 21a' advances to the FO membrane element 21a and joins the mixed liquid collected by the FO membrane element 21a. do.

In other words, the drive solution DS adjusted to a predetermined concentration is supplied to each of the FO membrane elements 21a and 21a' by providing a configuration in which the supply of the driving solution DS and the collection of the mixed liquid are performed separately. As a result, for example, the concentration of the driving solution DS supplied to the FO membrane element 21a is not diluted by the mixed liquid collected by the FO membrane element 21a', so that stable wastewater treatment can be performed for each of the FO membrane elements 21a and 21a'. can be executed.

FIG. 5 is a flow chart showing the procedure of wastewater treatment performed by the wastewater treatment apparatus 10 of FIG.

In FIG. 5 , first, the waste water is supplied to the separation/removal section 11 . The separation/removal unit 11 has a screen (not shown) for separating and removing large contaminants, and when the waste water passes through the separation/removal unit 11, the large contaminants in the waste water are removed by the screen (step S501). Next, the waste water from which large contaminants have been removed moves to the membrane filtration processing section 12 . The membrane filtration processing section 12 includes an FO membrane module 13 immersed in the waste water that has passed through the separation removal section 11, and the FO membrane module 13 has FO membrane elements 21a and 21b. The FO membrane elements 21 a and 21 b are connected to the rotating shaft and have an FO membrane 23 , which forms an internal space 31 . The internal space 31 of the FO film 23 is supplied with the driving solution DS from the driving solution supply unit 14 via the driving solution supply end 24a (step S502). That is, the FO membrane 23 is disposed between the wastewater containing contaminants, dissolved substances and water and the driving solution DS containing water and other than the wastewater.

A baffle plate 32 is arranged in the internal space 31 of the FO film 23 , and a gap is formed between the FO film 23 and the baffle plate 32 . The driving solution DS supplied via the driving solution supply end 24a sequentially passes through the driving solution contact surface 32a of the baffle plate 32, the outer edge gap 33, the driving solution guiding surface 32b, and the mixed solution collecting end 24b. and collect water. In other words, a channel for the driving solution DS is formed around the baffle plate 32, and the driving solution DS moves in the internal space 31 of the FO membrane 23 along the channel (step S503).

On the other hand, the FO membrane 23 traps soluble substances and contaminants in the waste water. At this time, water in the waste water permeates the FO membrane 23, moves to the internal space 31 of the FO membrane 23, and is mixed with the driving solution DS (step S504). Subsequently, the liquid mixture of the moisture and the driving solution DS that has permeated the FO membrane 23 is collected through the flow path of the driving solution DS (step S505), and after being discharged to the outside of the FO membrane module 13, this process is started. finish. Energy is recovered from the soluble substances and contaminants in the wastewater captured by the FO membrane 23 by, for example, methane fermentation.

According to the process of FIG. 5, the FO membrane 23 is disposed between the waste water containing contaminants, dissolved substances and water and the driving solution DS containing water but not the waste water (step S502). Since the FO membrane 23 generally has the ability to block substances with a molecular weight exceeding about 100, it captures not only contaminants in waste water but also soluble substances. based on the driving solution DS. Therefore, in the wastewater treatment, it is not necessary to perform biological treatment for removing soluble substances, and therefore membrane filtration treatment can be performed without the need to perform biological treatment.

Further, the FO membrane module 13 of the present embodiment includes the FO membrane 23 having the internal space 31 and the baffle 32 stored in the internal space 31 of the FO membrane 23. A gap is formed in the As a result, a channel for the driving solution DS is formed around the baffle plate 32 (step S503). As a result, the water contained in the wastewater is reliably drowned by the driving solution DS flowing along the flow path formed in the internal space 31 of the FO membrane 23 regardless of the portion of the FO membrane 23 that permeates the FO membrane 23 . The water content of the waste water moved to the space 31 can be reliably collected.

In the present embodiment, the FO membrane modules 13a and 13b are arranged such that the FO membrane elements 21a and 21b are alternately arranged so that the FO membrane elements 21a and 21b overlap when the FO membrane modules 13a and 13b are viewed from the front. , are arranged and each rotates independently. When the FO membrane modules 13a and 13b rotate, a shear flow is generated between the FO membrane elements 21a and 21b. It is preferable that the FO membrane modules 13a and 13b rotate in the same direction in order to efficiently generate a shear flow. A baffle plate may be provided around the FO membrane modules 13a and 13b. As a result, it is possible to strengthen the shear flow and prevent contaminants and the like in the waste water from adhering to the FO membrane 23 .

FIG. 6 is a schematic diagram used to explain a first modification of the FO membrane elements 21a and 21b in FIG. 2(B).

The FO membrane element 60 of FIG. 6 includes an FO membrane 23, a driving solution communication pipe 61, an outer edge supply pipe 62 (supply means), a water collection portion 63 (water collection means), and a mixed liquid communication pipe 64. The supply pipe 62 is arranged at the outer edge of the FO membrane element 60 , and the water collecting portion 63 is arranged at the center of the FO membrane element 60 . Further, the outer edge supply pipe 62 and the water collecting portion 63 hold the FO membrane 23, and the FO membrane element 60 has an internal space 31 inside the FO membrane 23 like the FO membrane elements 21a and 21b. Further, the driving solution connecting pipe 61 connects the driving solution supply end 24 a and the outer edge supply pipe 62 to send the driving solution DS supplied to the driving solution supply end 24 a to the outer edge supply pipe 62 . The outer edge supply pipe 62 has a plurality of supply holes facing the internal space 31 of the FO membrane 23, and supplies the driving solution DS to the internal space 31 of the FO membrane 23 from each supply hole.

The water collecting part 63 has a plurality of water collecting holes facing the inner space 31 of the FO membrane 23, and the driving solution DS supplied from the outer edge supply pipe 62 to the inner space 31 of the FO membrane 23 is supplied to each water collecting hole. water is collected. The mixed liquid communication pipe 64 connects the mixed liquid collecting end 24b and the water collecting portion 63, and sends the mixed liquid collected in the water collecting portion 63 to the mixed liquid collecting end 24b. In this way, the driving solution DS is supplied from each supply hole provided in the outer edge supply pipe 62, and the mixed liquid is collected in each water collection hole provided in the water collection part 63, so that the inside of the FO membrane 23 In the space 31, a flow path of the driving solution DS is formed from the outer edge supply pipe 62 to the water collecting portion 63. As shown in FIG.

The FO membrane 23 captures soluble substances and contaminants in the wastewater. At this time, water in the waste water permeates the FO membrane 23 and moves to the internal space 31 of the FO membrane 23 . The water in the wastewater that has moved to the internal space 31 of the FO membrane 23 is drowned out by the driving solution DS that flows along the channels formed in the internal space 31 of the FO membrane 23 . That is, in the internal space 31 of the FO membrane 23 , the mixed liquid of the moisture permeating the FO membrane 23 and the driving solution DS flows in the direction from the outer edge supply pipe 62 to the water collecting section 63 .

According to the FO membrane element 60 of FIG. 6, not only contaminants in the waste water but also soluble substances are captured, and water contained in the waste water moves to the driving solution DS based on the forward osmosis action. By using the membrane element 60 in the wastewater treatment apparatus 10, the same effect as wastewater treatment using the FO membrane elements 21a and 21b (FIG. 5), that is, membrane filtration without the need to perform biological treatment is performed. It is possible to achieve the effect of being able to

In addition, the FO membrane element 60 of FIG. 6 has an outer edge supply pipe 62 on the outer edge and a water collection part 63 in the center. irrespective of where it permeates the FO membrane 23, the water contained in the waste water is surely drowned by the driving solution DS flowing along the flow path formed in the internal space 31 of the FO membrane 23, and the FO membrane 23 Water in the waste water moved to the internal space 31 can be surely sent to the water collecting part 63. - 特許庁

Further, the outer edge supply pipe 62 has a plurality of supply holes facing the inner space 31 of the FO membrane 23 , and the water collecting part 63 has a plurality of water collecting holes facing the inner space 31 of the FO membrane 23 . As a result, the driving solution DS mechanically advances from each supply hole to each water collection hole, so that the flow path can be easily formed in the internal space 31 of the FO membrane 23 .

Although the FO membrane element 60 in FIG. 6 has the outer edge supply pipe 62 on the outer edge and the water collection part 63 in the center, other configurations are possible. Specifically, the FO membrane element 70 of FIG. 7 has a water collection portion 71 (water collection means) on the outer edge and a central supply pipe 72 (supply means) in the center. The central supply pipe 72 is connected to the driving solution supply end 24a by the driving solution connecting pipe 61, and the driving solution DS is supplied to the central supply pipe 72 from the driving solution supply end 24a. Since the central supply pipe 72 also has a plurality of supply holes facing the internal space 31 of the FO membrane 23, the driving solution DS is supplied from the central supply pipe 72 to the internal space 31 of the FO membrane 23 via each supply hole. A mixture of the moisture and the driving solution DS that has permeated the FO membrane 23 is collected in the water collection portion 71 via each water collection hole. That is, in the FO membrane element 60, the flow paths for the driving solution DS and mixed liquid are formed from the outer edge to the center of the FO membrane 23, but in the FO membrane element 70, the driving solution DS or A mixed liquid flow path is formed. On the other hand, since there are no other differences between the FO membrane elements 60 and 70, the FO membrane element 70 can achieve the same effects as the FO membrane element 60.

Further, the FO membrane element 60 supplies the driving solution DS from the outer edge supply pipe 62 to the inner space 31 of the FO membrane 23 , and collects the mixed liquid of the moisture permeating the FO membrane 23 and the driving solution DS in the water collection part 63 . Although it has been described that the FO membrane element 60 is configured to drain water, the supply of the driving solution DS and the collection of the mixed liquid may be performed separately in the FO membrane element 60 .

Specifically, the FO membrane module 13a includes an FO membrane element 60a and an FO membrane element 60a' adjacent to the FO membrane element 60a. It has a supply pipe 85 for supplying the driving solution DS to the space 31 and a water collecting pipe 86 for collecting the mixed solution (FIG. 8).

When the supply pipe 85 supplies the driving solution DS to the outer edges of the FO membrane elements 60a, 60a', the driving solution DS travels through the inner space 31 toward the collection pipe 86 located in the center of the FO membrane elements 60a, 60a'. . At this time, the driving solution DS advances to the water collecting pipe 86 as a mixed solution while dredging up the water that has permeated the FO membrane 23 . The water collection pipe 86 is communicated with the FO membrane elements 60a and 60a'. For example, the liquid mixture collected by the FO membrane element 60a' advances to the FO membrane element 60a and joins the liquid mixture collected by the FO membrane element 60a. do.

In other words, the drive solution DS adjusted to a predetermined concentration is supplied to each of the FO membrane elements 60a and 60a' by providing a configuration in which the supply of the driving solution DS and the collection of the mixed liquid are performed separately. As a result, for example, the concentration of the driving solution DS supplied to the FO membrane element 60a is not diluted by the mixed liquid collected by the FO membrane element 60a', so that stable wastewater treatment can be performed for each of the FO membrane elements 60a and 60a'. can be executed.

FIG. 9 is a diagram used to explain a second modification of the FO membrane elements 21a and 21b of FIG. 2(B).

The FO membrane element 90 shown in FIG. It has a water part 93 . The supply pipe 92 is connected to the driving solution supply end 24a, and the driving solution DS is supplied to the supply pipe 92 from the driving solution supply end 24a. The supply pipe 92 has a plurality of supply holes facing the inner space of the FO membrane 23, and the driving solution DS supplied to the supply pipe 92 is supplied to the inner space of the FO membrane 23 via each supply hole. The water collecting portion 93 has a plurality of water collecting holes facing the inner space of the FO membrane 23 and is connected to the mixed liquid collecting end 24b by a mixed liquid communication pipe 97. As shown in FIG. The mixed liquid existing in the inner space of the FO membrane 23 is sent to the mixed liquid collecting end 24b via each water collecting hole and the mixed liquid connecting pipe 97. FIG.

In addition, the FO membrane element 90 includes a baffle plate 94 and a baffle plate for regulating the flow directions of the driving solution DS and the mixed liquid in order to form the flow paths for the driving solution DS and the mixed liquid supplied from the supply pipe 92. 95 (blocking wall). The baffle plate 95 is arranged from the center to the outer edge of the FO membrane element 90, the baffle plate 94 is arranged between the supply pipe 92 and the baffle plate 95, and the driving solution DS and the mixed solution flow in the circumferential direction. are arranged so as to flow into the

Specifically, the FO membrane element 90 includes baffle plates 94a and 94b with one end connected to the supply pipe 92 and the other end open, and one end connected to the blocking plate 95 and the other end open. A baffle plate 94c is provided, and the baffle plate 94c is arranged between the baffle plates 94a and 94b. Further, the supply pipe 92 has supply holes 96 a , 96 b , 96 c for supplying the driving solution DS to the inner space of the FO membrane 23 .

The driving solution DS supplied to the inside of the FO membrane 23 from the supply hole 96a flows from the supply pipe 92 in the direction of the blocking plate 95 along the channel formed by the outer edge of the FO membrane 23 and the baffle plate 94a. , the driving solution DS collides with the blocking plate 95 . As a result, the direction of flow of the driving solution DS changes, and the driving solution DS flows from the blocking plate 95 toward the supply pipe 92 . Next, the driving solution DS flowing from the baffle plate 95 toward the supply pipe 92 flows along the flow path formed by the baffle plates 94 a and 94 c and collides with the supply pipe 92 . As a result, the direction of flow of the driving solution DS changes again, and the driving solution DS flows from the supply pipe 92 toward the blocking plate 95 . Subsequently, the driving solution DS flowing from the supply pipe 92 toward the baffle plate 95 flows along the flow path formed by the baffle plates 94 c and 94 b and collides with the baffle plate 95 . As a result, the direction of flow of the driving solution DS changes again, and the driving solution DS flows from the dam plate 95 toward the supply pipe 92 . After that, the driving solution DS flowing from the blocking plate 95 toward the supply pipe 92 flows along the channel formed by the baffle plate 94 b and the water collecting portion 93 and is collected by the water collecting portion 93 .

The driving solution DS supplied into the FO membrane 23 through the supply hole 96b joins the driving solution DS supplied into the FO membrane 23 through the supply hole 96a and flowing along the flow path formed by the baffle plates 94a and 94c. Then, it flows along the flow path formed by the baffle plates 94 c and 94 b and collides with the blocking plate 95 . After that, the driving solution DS flows along the channel formed by the baffle plate 94 b and the water collecting portion 93 and is collected by the water collecting portion 93 . The driving solution DS supplied from the supply hole 96c into the FO membrane 23 joins the driving solution DS flowing along the channel formed by the baffle plate 94b and the water collecting portion 93, and is collected by the water collecting portion 93. be watered.

According to the FO membrane element 90 of FIG. 9, not only contaminants in the waste water but also soluble substances are captured, and water contained in the waste water moves to the driving solution DS based on forward osmosis. Therefore, the wastewater treatment using the FO membrane element 90 can produce the same effect as the treatment of FIG. 5, that is, the effect of being able to perform membrane filtration treatment without the need to perform biological treatment.

The FO membrane element 90 has a supply pipe 92 , baffle plates 94 a , 94 b , 94 c and a baffle plate 95 . form a flow path for the water contained in the waste water that has permeated the , and the driving solution DS, and regulate their flow directions. As a result, a detour is formed in the internal space of the FO membrane 23, and as a result, short-circuiting of the driving solution DS is suppressed, and water contained in the driving solution DS and the waste water that permeates the FO membrane 23 is collected. be able to.

Each of the FO membrane elements 21a, 21b, 60, 70, and 90 in this embodiment may have a wiper mechanism such as a brush, sponge, or rubber plate near the FO membrane 23 itself or the FO membrane 23. FIG. For example, when the FO membrane element 21a and the FO membrane element 21b are arranged adjacent to each other and the FO membrane element 21a has a wiper mechanism, if the FO membrane element 21a rotates with respect to the FO membrane element 21b, the surface of the FO membrane element 21b is wiped. is cleaned by the wiper mechanism of the FO membrane element 21a, and can effectively remove fouling substances accumulated on the surface of the FO membrane 23 of the FO membrane element 21b.

Furthermore, in the present embodiment, the FO membrane elements 21a, 21b, 50, 70, and 90 have been described as one disk-shaped member. may consist of a plurality of members, and may be configured so that each member can be split or combined.

Although the present invention has been described using the above-described embodiments, the present invention is not limited to the above-described embodiments.

DS driving solution 10 wastewater treatment device 23 FO membrane 32 baffle plate 33 outer edge gap 62 outer edge supply pipes 63, 71, 93 water collecting portion 72 central supply pipes 85, 92 supply pipes 94a, 94b, 94c baffle wall 21a , 21b, 60, 70, 90 FO membrane element

Claims (11)

Wastewater containing contaminants, soluble substances and water, and water containing water and disposed between a driving solution other than said wastewater to remove said contaminants and soluble substances from said wastewater and contained in said wastewater a disk-shaped removing means having a rotating shaft for allowing the driving solution to pass through the
a disk-shaped forming means for forming a flow path for the driving solution inside the removing means ,
A wastewater treatment apparatus, wherein a gap is formed between the removing means and the forming means in the outer edge portion and the surface portion of the forming means . 2. A waste water treatment apparatus according to claim 1, wherein the pressure applied to said removing means from said waste water is higher than the pressure applied to said removing means from said driving solution. Wastewater containing contaminants, soluble substances and water, and water containing water and disposed between a driving solution other than said wastewater to remove said contaminants and soluble substances from said wastewater and contained in said wastewater a disk-shaped removing means having a rotating shaft for allowing the driving solution to pass through the
supply means for supplying the driving solution from the outer edge of the removal means to the inside of the removal means;
A waste water treatment apparatus, comprising: a water collecting means arranged in the center of the removing means for collecting water contained in the driving solution and the waste water. Wastewater containing contaminants, soluble substances and water, and water containing water and disposed between a driving solution other than said wastewater to remove said contaminants and soluble substances from said wastewater and contained in said wastewater a disk-shaped removing means having a rotating shaft for allowing the driving solution to pass through the
supply means for supplying the driving solution from the center of the removal means to the inside of the removal means;
A waste water treatment apparatus, comprising: a water collecting means disposed on an outer edge of the removing means for collecting water contained in the driving solution and the waste water. 5. A waste water treatment apparatus according to claim 3, wherein said supply means has at least one supply hole, and said water collection means has at least one water collection hole. Wastewater containing contaminants, soluble substances and water, and water containing water and disposed between a driving solution other than said wastewater to remove said contaminants and soluble substances from said wastewater and contained in said wastewater a disk-shaped removing means having a rotating shaft for allowing the driving solution to pass through the
a disk-shaped forming means for forming a flow path for the driving solution inside the removing means ,
The wastewater treatment apparatus, wherein the forming means has a plurality of baffle walls, and each baffle wall regulates the flow direction of the driving solution and the water contained in the wastewater that has permeated through the removal means. . Wastewater containing contaminants, soluble substances and water, and water containing water and disposed between a driving solution other than said wastewater to remove said contaminants and soluble substances from said wastewater and contained in said wastewater a disk-shaped removing means having a rotating shaft for allowing the driving solution to pass through the
a disk-shaped forming means for forming a flow path for the driving solution inside the removing means ,
A membrane element, wherein a gap is formed between the removing means and the forming means in the outer edge portion and the surface portion of the forming means . Wastewater containing contaminants, soluble substances and water, and water containing water and disposed between a driving solution other than said wastewater to remove said contaminants and soluble substances from said wastewater and contained in said wastewater a disk-shaped removing means having a rotating shaft for allowing the driving solution to pass through the
supply means for supplying the driving solution from the outer edge of the removal means to the inside of the removal means;
and a water collecting means disposed in the center of the removing means for collecting water contained in the driving solution and the waste water. Wastewater containing contaminants, soluble substances and water, and water containing water and disposed between a driving solution other than said wastewater to remove said contaminants and soluble substances from said wastewater and contained in said wastewater a disk-shaped removing means having a rotating shaft for allowing the driving solution to pass through the
supply means for supplying the driving solution from the center of the removal means to the inside of the removal means;
and a water collecting means disposed on the outer edge of the removing means for collecting water contained in the driving solution and the waste water. Wastewater containing contaminants, soluble substances and water, and water containing water and disposed between a driving solution other than said wastewater to remove said contaminants and soluble substances from said wastewater and contained in said wastewater a disk-shaped removing means having a rotating shaft for allowing the driving solution to pass through the
a disk-shaped forming means for forming a flow path for the driving solution inside the removing means ,
A membrane element according to claim 1, wherein said forming means has a plurality of baffle walls, and each baffle wall regulates the flow direction of the water contained in said waste water and permeating said removal means and said driving solution. Wastewater containing contaminants, soluble substances and water, and water containing water and disposed between a driving solution other than said wastewater to remove said contaminants and soluble substances from said wastewater and contained in said wastewater a disc-shaped removing means having a rotating shaft, and a disc-shaped forming means for forming a flow path for the driving solution inside the removing means, the removing means and In the wastewater treatment method performed by a wastewater treatment apparatus in which gaps are formed between the forming means in the outer edge portion and the surface portion of the forming means ,
a supply step of supplying the driving solution to the inside of the removing means; a removal step of removing the contaminants and the soluble substances from the wastewater;
a mixing step in which moisture contained in the waste water passes through the removing means and is mixed with the driving solution;
and a water collecting step of collecting the driving solution and water mixed with the driving solution.

Images