JP5824995B2 - Microbe attachment carrier - Google Patents

Description

  The present invention relates to a microorganism adhesion carrier to which microorganisms for biological treatment of organic wastewater or the like are adhered.

Conventionally, it is known that biological treatment is effective as a treatment method for organic wastewater such as household wastewater and factory wastewater. Among them, the activated sludge method is most widely adopted.
In the activated sludge method, a carrier is immersed and disposed in a treated water tank into which activated sludge has been charged, microorganisms contained in the activated sludge are adhered to the surface of the carrier, and organic matter in waste water is decomposed by the adhered microorganisms. There is. Here, as the carrier, one using a fiber product is known. For example, Patent Document 1 describes a mall-shaped biological carrier composed of a large number of short fibers and string-like shaft members. Patent Document 2 describes a fibrous carrier made of an aggregate of fibers.

JP 2002-355688 A JP 2007-98242 A

  However, it has been difficult to arrange and fix the carrier in the form described in Patent Documents 1 and 2 in the treatment water tank with a high arrangement density per unit volume and with a simple configuration.

  The present invention has been made in view of the above circumstances, and provides a carrier for attaching microorganisms that can be arranged and fixed in a treatment tank easily and at a high arrangement density per unit volume, and capable of efficient biological treatment. Objective.

The microorganism-adhering carrier of the present invention is a sheet-like microorganism-adhering carrier that is immersed in a membrane-separated activated sludge tank and adheres microorganisms, comprising a nonwoven fabric on at least one surface, and supporting the microorganism-adhering carrier An insertion hole for inserting the supporting member is formed, and the nonwoven fabric is a dry nonwoven fabric .
The insertion hole is preferably formed in at least a part of the periphery of the carrier for attaching microorganisms.
The fibers constituting the nonwoven fabric are preferably acrylic fibers having 50% by mass or more of acrylonitrile units.
The insertion hole can be preferably exemplified by a cylindrical portion formed by folding and sewing a part of the peripheral edge of the microorganism adhesion carrier, or a through hole penetrating from one surface to the other surface of the microorganism adhesion carrier.
The basis weight of the nonwoven fabric is preferably 60 g or more and 300 g or less per 1 m ² .

  ADVANTAGE OF THE INVENTION According to this invention, the support | carrier for microorganisms adhesion which can be arrange | positioned and fixed in a processing water tank simply and with a high arrangement density per unit volume, and can perform an efficient biological treatment can be provided.

It is a perspective view which shows the support | carrier with a supporting member provided with the support | carrier for microorganisms adhesion of this invention. It is a perspective view explaining the manufacturing method of the support | carrier for microorganisms attachment shown by FIG. It is the perspective view which expanded the principal part about an example of the support | carrier for microorganisms adhesion. It is the perspective view which expanded the principal part about another example of the support | carrier for microorganisms adhesion. It is a perspective view which shows the carrier unit provided with the support | carrier with a supporting member of FIG. It is a perspective view which shows the other example of the support | carrier for microorganisms adhesion of this invention. It is a perspective view which shows the state which has arrange | positioned two or more microorganisms adhesion | attachment carriers of FIG. It is a perspective view which shows the carrier unit provided with the carrier for microorganism adhesion of FIG. FIG. 9 is a side view showing a state in which spacers are arranged between carriers for attaching microorganisms in the carrier unit of FIG. 8. FIG. 10 is a perspective view showing a state in which a hanging tool is combined with the carrier unit of FIG. 9.

Hereinafter, the present invention will be described in detail.
The carrier for attaching microorganisms of the present invention is a sheet-like material provided with a nonwoven fabric composed of fibers on at least one surface, and is immersed in a treated water tank into which activated sludge for biologically treating organic wastewater is introduced. It is arranged to attach microorganisms in activated sludge. Examples of the treated water tank include an activated sludge tank in which only biological treatment with activated sludge is performed, and a membrane separation activated sludge tank in which a separation membrane such as a hollow fiber membrane is also immersed, and membrane treatment with a separation membrane is performed together with biological treatment. It is done.

As the fibers constituting the nonwoven fabric, those having a strength capable of forming a nonwoven fabric that can be processed into a nonwoven fabric shape by a simple method and that do not break even when immersed in a treated water tank are preferable.
Specific examples include polyester fiber, polyamide fiber, polypropylene fiber, and acrylic fiber. Acrylic fiber is preferable from the viewpoint of affinity with microorganisms. As the acrylic fiber, an acrylic polymer fiber having 50% by mass or more of acrylonitrile units is preferable.

“Having 50% by mass or more of acrylonitrile units” means that the ratio of acrylonitrile in the monomer for producing the acrylic polymer is 50% by mass or more.
Moreover, the preferable upper limit of an acrylonitrile unit is 97 mass%.

The acrylic polymer having 50% by mass or more of acrylonitrile units can have a unit composed of an unsaturated monomer copolymerizable with acrylonitrile in a range of 50% by mass or less.
The unsaturated monomer copolymerizable with acrylonitrile is not particularly limited, and examples thereof include acrylic acid, methacrylic acid, derivatives thereof, vinyl acetate, acrylamide, vinyl chloride, and vinylidene chloride. Depending on the purpose, ionic unsaturated monomers such as vinylbenzene sulfonic acid soda, methacrylic sulfonic acid soda, and acrylamidomethylpropane sulfonic acid soda can be used as unsaturated monomers copolymerizable with acrylonitrile.

  The polymerization method of the acrylic polymer is not particularly limited, and for example, a usual suspension polymerization method or solution polymerization method can be adopted.

The nonwoven fabric is not particularly limited as long as it is composed of fibers such as acrylic fibers, but the nonwoven fabric is required to have durability in a treated water tank as a carrier for attaching microorganisms. A manufactured dry nonwoven fabric is preferred.
A dry nonwoven fabric is obtained by carding and laminating staple fibers having a crimped shape to form a web and binding the web. As the method for binding the web, a method selected from the spunlace method, the needle punch method, and the stitch bond method is preferable because the fiber can be exposed as much as possible on the surface of the nonwoven fabric.

  The manufactured nonwoven fabric may be subjected to arbitrary processing such as calendering, embossing, raising, and hot pressing as necessary.

The basis weight and thickness of the nonwoven fabric are related to the amount of microorganisms when immersed as a carrier for microorganism adhesion, strength, durability, etc., and can be adjusted according to the quality of the wastewater in the treatment water tank, treatment conditions, The basis weight is preferably 60 g or more per 1 m ² . When the basis weight is 60 g or more, it is possible to exhibit sufficient strength and durability even when a physical load such as aeration is applied by being immersed in a membrane separation activated sludge tank as a carrier for attaching microorganisms, Microorganisms can be sufficiently adhered.
On the other hand, since many microorganisms are easily attached and held on the surface of the nonwoven fabric, if the basis weight is too high, the fibers inside the nonwoven fabric are not sufficiently utilized for the adhesion of microorganisms. If the basis weight is too high, the weight of the nonwoven fabric increases due to sludge and moisture adhering to the nonwoven fabric. From such a viewpoint, the basis weight per 1 m ² is preferably 1000 g or less, and more preferably 300 g or less in consideration of the processability of the nonwoven fabric and the efficiency of adhesion of microorganisms.

  If the thickness of the nonwoven fabric is too thin, the strength and durability may be reduced, and the amount of microorganisms attached may be insufficient. Moreover, when too thick, workability will fall, for example, when manufacturing a carrier unit like the after-mentioned, it may become difficult to process. Therefore, the thickness of the nonwoven fabric is preferably 0.5 mm or more and 30 mm or less, and more preferably 20 mm or less from the viewpoint of workability.

  The microorganism-adhering carrier of the present invention is a sheet-like material comprising the above-mentioned nonwoven fabric on at least one surface, and may be composed only of the nonwoven fabric, or the strength and durability of the microorganism-adhering carrier. In order to improve the property, it may be composed of a laminate of two or more layers in which a base fabric is laminated on a nonwoven fabric. In the case of a laminated body, it is necessary that the above-mentioned nonwoven fabric is located on at least one surface. From the viewpoint of adhesion of microorganisms, both nonwoven fabrics such as a structure in which a base fabric is sandwiched between two nonwoven fabrics are used. It is preferably located on the surface. Examples of the base fabric include spunbonded nonwoven fabrics and woven fabrics made of fibers that are hardly degradable to water and living organisms, such as polyester fibers, polypropylene fibers, polyamide fibers, and acrylic fibers.

Next, the carrier for attaching microorganisms of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view showing a carrier 30 with a support member comprising a carrier 10A for attaching microorganisms, which is an example of the present invention, and two support rods (support members) 20 that support the carrier 10A for attaching microorganisms. .
The carrier for microorganism attachment 10A included in the carrier with support member 30 is made of a rectangular nonwoven fabric 11, and a pair of opposing ends of the nonwoven fabric 11 are folded and sewn as insertion holes through which the support member 20 is inserted. Two cylindrical portions 12 are provided. Reference numeral 13 in the figure denotes a seam obtained by sewing the folded portion, and the seam 13 is provided along the length direction of each cylindrical portion 12.

  The cylindrical portion 12 may be one in which the end portion of the nonwoven fabric 11 is folded and sewn only once, but, for example, as shown in FIG. If it is sewn and formed as shown in FIG. 2 (b), the non-woven fabric 11 of the portion constituting the cylindrical portion 12 is multi-layered and has excellent strength when the support rod 20 is inserted. Also, as shown in FIG. 3, when a plurality of seams 13 are formed substantially in parallel along the length direction of the cylindrical portion 12, the handleability is improved such that the support rod 20 can be easily inserted into the cylindrical portion 12.

Further, in order to increase the strength of the cylindrical portion 12, the cylindrical portion 12 can be reinforced.
As shown in FIG. 4, as the reinforcement processing, after the end portion of the nonwoven fabric 11 is folded into a multilayer as shown in FIG. 2A, for example, a sheet-like reinforcing member 14 such as a carbon sheet is inserted between the layers. Then, there is a method of forming the cylindrical portion 12 by sewing.
Moreover, as reinforcement processing, before forming the cylinder part 12, the part is reinforced by apply | coating or impregnating binders, such as a urethane resin, with respect to the nonwoven fabric 11 of the part used as the cylinder part 12 at least. Examples include methods.

Thus, by forming the cylindrical portion 12 on at least a part of the periphery of the microorganism adhesion carrier 10, and inserting the support rod 20 into the cylindrical portion 12, using the inserted support rod 20, In addition, efficient biological treatment can be performed by arranging and fixing the plurality of microorganism adhesion carriers 10A in the treatment water tank at a high arrangement density per unit volume.
Specifically, for example, as shown in FIG. 5, a support rod 20 is inserted into each cylindrical portion 12 of the microorganism adhesion carrier 10A to form a carrier 30 with a support member, and a plurality of carriers 30 with a support member are arranged in parallel. (In the example shown, 4 sheets are arranged.) Then, one end 20a of each support bar 20 is attached to the first frame 40, and the other end 20b is attached to the second frame 50 to form a carrier unit 60A. The carrier unit 60A assembled in this manner is immersed in a treatment water tank (not shown), and the first frame body 40 or the second frame body 50 is fixed to the tank wall with a fixture such as a bolt, or suspended from above. By doing so, the microorganism-adhering carrier 10A can be arranged and fixed in the treated water tank at a high arrangement density per unit volume.

FIG. 6 is a perspective view showing a microorganism adhesion carrier 10B which is another example of the present invention.
The carrier 10B for attaching microorganisms of this example is formed of a rectangular nonwoven fabric 11, and is a through hole 16 penetrating from one surface to the other surface at a pair of opposing ends of the nonwoven fabric 11 as insertion holes through which the support rod 20 is inserted. Are formed at each end. In this example, three through holes 16 are formed at each end. Moreover, in this example, after each edge part of the nonwoven fabric 11 is folded once or more to make a multilayer, a through hole 16 is formed. Thereby, the strength of the through hole 16 can be increased. Note that the folded portion is bonded by sewing or an adhesive to fix the folded portion.

In this way, a plurality of through holes 16 are formed in each of the opposing end portions of the microorganism-adhering carrier 10B, and the support rods 20 are inserted into the through holes 16 so that the inserted support rods 20 are used. Thus, efficient biological treatment can be performed by arranging and fixing a plurality of microorganism adhesion carriers 10B in the treatment water tank in a simple and high arrangement density per unit volume.
Specifically, for example, as shown in FIG. 7, a plurality of microorganism attachment carriers 10B of FIG. 6 are arranged in parallel (in the illustrated example, five pieces), and so as to penetrate these plurality of microorganism attachment carriers 10B. The plurality of support bars 20 are inserted into the corresponding through holes 16 of the microorganism adhesion carriers 10B. Then, as shown in FIG. 8, one end 20a of each support bar 20 is attached to the first frame 40, and the other end 20b is attached to the second frame 50 to form a carrier unit 60B. Is placed and fixed in a treatment water tank (not shown). Specifically, the form which fixes the 1st frame 40 or the 2nd frame 50 to a tank wall with fixing tools, such as a volt | bolt, or hangs is mentioned. Further, when a plurality of microorganism adhesion carriers 10B are arranged in parallel in this way, as shown in FIG. 9, in order to maintain a constant interval between adjacent microorganism adhesion carriers 10B, spacers 70 are provided between them. It is preferable to arrange. The spacer 70 in this example has a through hole 70a in the center, and the support rod 20 is inserted into the through hole 16 of the microorganism adhesion carrier 10B and the through hole 70a of the spacer 70.

  Further, as shown in FIG. 10, a frame-shaped suspending tool 80 that is connected above the first frame 40 and the second frame 50 in the carrier unit 60B of FIG. 8 and suspends the carrier unit 60B is provided. Further, a plurality of microorganism attachment carriers 10B may be arranged and fixed in the treated water tank by combining and fixing the hanging tool 80 to a tank wall or the like with a fixing tool.

  As described above, at least a part of the periphery of the carrier for attaching microorganisms as an insertion hole for inserting the support member, for example, a cylindrical portion 12 that is sewn by folding back a part of the periphery of the carrier for attaching microorganisms 10A, When the through holes 16 penetrating from one surface to the other surface of the microorganism adhesion carrier 10B are formed, the plurality of microorganism adhesion carriers 10A and 10B can be easily disposed in the treated water tank at a high arrangement density per unit volume. It can be placed and fixed on the surface, and efficient biological treatment can be performed.

  The interval between the microorganism adhesion carriers 10A and 10B in the carrier units 60A and 60B is preferably 20 mm or more from the viewpoint of efficient processing. In addition, in the microorganism adhesion carriers 10A and 10B, it is preferable to reinforce both side ends where the insertion holes are not formed by side stitching, side folding, or the like.

10A, 10B Microorganism adhesion carrier 11 Non-woven fabric 12 Tube portion 16 Through hole 20 Support rod (support member)

Claims (6)

It is a carrier for adhering microorganisms in the form of a sheet that is immersed in a membrane separation activated sludge tank and adheres microorganisms,
A non-woven fabric on at least one surface;
An insertion hole is formed through which a support member that supports the carrier for attaching microorganisms is inserted ,
A carrier for attaching microorganisms , wherein the nonwoven fabric is a dry nonwoven fabric .   2. The microorganism adhesion carrier according to claim 1, wherein the insertion hole is formed in at least a part of a peripheral edge of the microorganism adhesion carrier.   The carrier for attaching microorganisms according to claim 1 or 2, wherein the fibers constituting the nonwoven fabric are acrylic fibers having an acrylonitrile unit of 50 mass% or more.   The said insertion hole is a support | carrier for microorganisms adhesion as described in any one of Claims 1-3 which is a cylinder part formed by folding and sewing a part of periphery of the said carrier for microorganisms adhesion.   The said insertion hole is a support | carrier for microorganisms adhesion as described in any one of Claims 1-3 which is a through-hole penetrated from the one surface to the other surface of the said microorganisms adhesion carrier. The basis weight of the nonwoven fabric is 1 m ² The carrier for attaching microorganisms according to any one of claims 1 to 5, wherein the carrier is 60 g or more and 300 g or less.

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