JP4493396B2 - Sewage purification device and contact material block - Google Patents

Description

  The present invention relates to a sewage purification apparatus for purifying sewage using the living action of microorganisms. Specifically, the present invention relates to a sewage purification apparatus in which a plurality of microorganism-carrying contact materials having a large surface area centered on a core material are fixed in a sewage treatment tank of the sewage purification apparatus or a contact material block in which a plurality of the contact materials are fixed.

  In one of the sewage purification devices that purify sewage using the living action of microorganisms, a tape-like material, a fiber-like material or a string-like material (hereinafter referred to as a string-like material) and a certain core material are used. Some use a contact material in which a large number of loop-shaped projections are arranged such that a part of the string-like material is fixed to the core material and the other part protrudes into the sewage with the core material as a center. In such a contact material, in order to increase the surface area per unit volume of the treatment tank and to generate an appropriate stirring flow, the core material is also formed into a spiral shape. Such a contact material has a large surface area that comes into contact with sewage, makes it easier for microorganisms to settle in, and has a relatively high sewage purification capability.

  In order to store such a contact material in the sewage purification apparatus, a frame body in which a plurality of vertical and horizontal frames are combined is prepared, and both ends of the contact material are positioned so that the contact material is positioned between the substantially parallel frames. The part is usually fixed to the frame. At that time, in order to increase the volume utilization efficiency of the treatment tank, a plurality of contact materials are often used in a fixed manner and spaced in parallel (see, for example, Patent Document 1).

  In order to continuously produce the sewage purification action by microorganisms, it is necessary to supply oxygen to the sewage and perform appropriate stirring to maintain the oxygen concentration in the sewage at a certain level or higher. For this reason, an aeration means is usually provided in the lower part of the treatment tank, and the air supplied from the air is often supplied to the microorganisms while ascending the sewage and generating a stirring flow. If for some reason the sewage is not sufficiently stirred during operation and there is a part of the contact material where oxygen is not sufficiently supplied, the part and its surroundings become anaerobic and rot, causing sewage The purification action is also lost.

However, due to this stirring flow by aeration, a force having a random cycle and strength continues to be applied to the contact material over a long period of time. For this reason, when a metal member is used for fixing the contact material, the metal member is destroyed in a relatively short time due to metal fatigue and corrosion due to vibrations in the vertical and horizontal directions, and the contact material is dropped and displaced. Further, a method of fixing a contact material to a frame using a support piece having a substantially C-shaped cross section molded with a synthetic resin is also known (see, for example, Patent Document 2). However, although corrosion of the support piece does not occur, the support piece is cracked due to stress concentration due to continuous vibration. As a result, the actual situation is that the sewage purification operation can be performed only for a period shorter than the original life of the contact material.
JP 05-115889 A Japanese Patent Laid-Open No. 10-272482

  The present invention provides a sewage purification apparatus or a contact material block therefor that is capable of maintaining the sewage purification capability over a long period of time, even though the contact material can be easily fixed to the frame, and in which the contact material is less likely to drop off or be displaced. This is the issue.

  A first aspect of the invention is a sewage purification apparatus in which a plurality of contact members comprising a core material and a plurality of loop-shaped projections provided on the surface of the core material are fixed in a treatment tank, wherein the core material is acceptable. The contact material is flexible, and at least both ends thereof are wound around and fixed to a rod-shaped fixing member provided in the processing tank, and the rod-shaped fixing member has a large number of convex portions on the surface. It is a sewage purification apparatus characterized by having.

  Here, it is preferable that the convex portions are provided substantially periodically along the length direction of the fixing member. Moreover, it is preferable that the said convex part is 0.3 mm or more and 5 mm or less in height, and the distance of the length direction of the said fixing member is 2 mm or more and 26 mm or less. The fixing member is preferably a corrosion-resistant deformed steel bar. Moreover, it is preferable that sewage purification is performed by the microorganisms carried on the contact material.

  A second aspect of the invention is a contact member in which a plurality of contact members each composed of a core member and a plurality of loop-shaped protrusions provided on the surface of the core member are fixed to a substantially rectangular parallelepiped frame body in which frames are combined vertically and horizontally. The core is flexible, and at least two of the frames that are substantially parallel to each other are rod-shaped fixing members, and at least both ends of the contact material are the at least two Each of the rod-shaped fixing members is fixed by being wound around each of the rod-shaped fixing members, and the rod-shaped fixing member has a large number of convex portions on the surface.

  The contact material can be easily fixed to the treatment tank or the frame, and the contact material is not easily dropped or displaced, and a sewage purification apparatus or a contact material block that can be stably operated over a long period of time is obtained.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Sewage that is subject to purification treatment includes not only sewage and industrial wastewater, but also river water and lake water. FIG. 1 is an external view of a portion including one end portion of a contact material capable of supporting microorganisms in order to perform such sewage purification treatment. The contact material 10 is composed of a corrosion-resistant and flexible core material 11 deformed in a spiral shape and a large number of loop-shaped protrusions 12 provided on the surface of the core material. FIG. 1A is a schematic view of the contact material 10 viewed from the direction of the spiral shaft 13, and FIG. 1B is a schematic view of the contact material 10 viewed from the direction orthogonal to the spiral shaft 13. The contact material 10 is provided with a loop-shaped protrusion to the end.

  The core material 11 needs to have flexibility. Utilizing this property, the contact material can be fixed in the sewage flow by winding both ends of the contact material 10 around the fixing member of the treatment tank or the contact material frame. In addition, the shape of the contact material can be arbitrarily changed between the production and use of the contact material, and once deformed, the shape can be maintained for a long time. For this reason, the core material is not easily deformed due to the influence of gravity or sewage flow, and the contact materials are less likely to approach each other than necessary during use. Incidentally, if adjacent contact materials are too close or partially overlapped, as described above, the sewage flow in that portion is inhibited, resulting in insufficient oxygen supply. Then, the oxygen concentration is likely to be lower than the dissolved oxygen concentration necessary for the microorganisms to inhabit, resulting in the death of the microorganisms or a decrease in activity.

  As a material that gives flexibility to the core material, metal wire or appropriately plasticized soft vinyl chloride is used from the viewpoint of ease of processing and strength against gravity and sewage flow after microorganisms are supported. A plastic rod or the like can be used. A metal wire is preferably used from the viewpoint that mold return after deformation into the contact material is unlikely to occur. As the material of the metal wire, a material having relatively large flexibility such as soft iron, aluminum, copper, etc. can be used without particular limitation, but copper is preferable from the viewpoint of corrosion resistance in water.

  When using a metal wire for the core material, since it is used for a long time in sewage, it is preferable to coat the metal wire to prevent corrosion. The coating may be a waterproof coating or the like, but it is preferable to provide a coating with a plastic such as vinyl chloride from the viewpoint of handling and followability of the coating against deformation.

  Although the diameter of a core material changes with materials, it is preferable that they are 1 mm or more and 7 mm or less. More preferably, it is 2 mm or more and 6 mm or less. More preferably, it is 3 mm or more and 5 mm or less. The core material may be a stranded wire obtained by bringing together a plurality of fine wires, or may be a single wire, but in particular when the core material is a metal wire, a single wire is used to combine strength and flexibility. It is good to use.

  The contact material 10 is configured by fixing a large number of loop-shaped protrusions 12 on the surface of such a core material 11. The loop-shaped protrusion 12 is made of a tape, string, fiber, etc., part of which is fixed to the surface of the core material, and the other part protrudes in a loop shape from the surface of the core material into the sewage. It is configured to be fixed on the surface. The reason for the loop shape is that microorganisms are less likely to fall off the contact material. Moreover, in order to enlarge the surface area of a contact material, it is preferable to comprise a protrusion using a fiber.

  The material of the loop-shaped protrusion 12 is preferably made of a synthetic resin because it can maintain strength and dimensional stability in water, is not easily decomposed by microorganisms, and can be easily molded into a fiber shape. Especially, it is preferable to use a thermoplastic resin from the ease of manufacture. Examples of the thermoplastic resin include polyethylene, polypropylene, polyester, nylon, polyvinyl chloride, polyvinylidene chloride, and polyvinylidene fluoride. In particular, it is preferable to use polyvinylidene chloride because the specific gravity is large and the protrusions can maintain a certain degree of rigidity and easily maintain the shape of the loop. The method for producing the loop-shaped projection is not particularly limited as long as spinning or the like is performed according to a conventional method within the range where the effects of the invention are exhibited. In addition, when a protrusion is comprised with a fiber, as for the thickness of a fiber, 50 dtex or more and 150 dtex or less are preferable. Above 50 dtex, the grown microorganisms are less likely to drop off from the contact material due to gravity or stirring flow, and at 150 dtex or less, the surface area per unit volume of the contact material increases.

  In addition, it is preferable to use a loop-shaped protrusion whose surface is positively charged in water having a pH of 5 or more and 9 or less. By doing in this way, it becomes difficult for microorganisms to fall off from a contact material. In order to charge the surface, a charging agent such as a quaternary ammonium salt that is positively charged in water having a pH of 5 or more and 9 or less is kneaded into the material of the protrusion and then molded, It can be obtained by a method such as coating or impregnation on the surface, or graft polymerization on the surface.

The height of the loop-shaped protrusions (the distance from the core surface to which the both ends of the loop are fixed to the tip of the loop farthest in the shape formed by the loop without applying external force) is 4 mm or more and 16 mm or less It is desirable to be. When the height of the loop is 16 mm or less, oxygen is easily supplied even near the base of the loop, and an anaerobic atmosphere is unlikely to occur. In order to increase the surface area of the contact material as much as possible, the height is desirably 4 mm or more. Furthermore, as described in FIG. 2, two types of loop-shaped projections having a height of 4 mm or more and less than 10 mm (h ₂ ) and a height of 10 mm or more and 16 mm or less (h ₁ ) are used. May be arranged alternately, or three or more of them may be used. As a result, the stirring flow is easy to flow and an anaerobic atmosphere is hardly generated.

The loop-shaped protrusion is preferably a fiber bundle in which 3 or more and 20 or less fibers are bundled, and the fiber bundle is preferably provided on the surface of the core material as a unit. Thereby, it becomes easy to ensure a sewage flow and to supplement microorganisms. More preferably, they are 5 or more and 15 or less, More preferably, they are 7 or more and 12 or less. The density at which such fiber bundles are provided on the core material surface is preferably 25 to 81 bundles per 1 cm ^{2 of} the core surface. Anaerobic atmosphere is less likely to occur at 81 bundles or less, and microorganisms can be firmly captured against the agitation caused by the sewage flow accompanying aeration at 25 bundles or more. More preferably, it is 36 bundles or more and 64 bundles or less.

  Examples of a method for manufacturing the contact member 10 by fixing the loop-shaped protrusion 12 on the surface of the core member 11 include the following methods. First, a tape-shaped base fabric 2 is prepared, and a pile fabric 1 as shown in FIG. 2 is prepared by previously weaving a string, tape, or fiber in a loop shape. The material of the base fabric is preferably made of synthetic fiber because it maintains strength in water, has dimensional stability, and is hardly decomposed by microorganisms. As the synthetic fiber, any of polyamide fiber, polyester fiber, polyurethane fiber, polyvinyl chloride fiber, polyvinylidene chloride fiber, polyacrylic fiber, and the like can be used. The thickness of the base fabric is preferably about 0.1 mm to 2 mm.

  Next, the base fabric 2 of such a pile fabric 1 is spirally wound around a linear flexible core material 11. Here, the method of covering the pile fabric with the core material is to make the base fabric into a bag shape and cover the core material, or match the base fabric along the core material as a rectangle of (core material length x core material circumference). The joints may be joined without any particular limitation. Also, the method for fixing the base fabric to the core is not particularly limited, and the base fabric may be directly bonded to the core by welding or using an adhesive, or the seam of the base fabric is sewn or bonded. It may be fixed by such a method. Moreover, you may fix by the method of binding with a thread | yarn etc. on the base fabric wound around the core material. When the base fabric is wound in a spiral shape, only the base fabric at both end portions of the core material may be fixed. The core material including the base fabric preferably has a diameter of 3 mm or more and 8 mm or less. By setting it as such a diameter, it becomes possible to earn the area of the base fabric which implants a loop-shaped protrusion.

  FIG. 3 shows a cross-sectional view of the linear contact material 5 created in this way. Here, a metal single wire 6 is covered with a polyvinyl chloride resin layer 7 to constitute a core material 11 on which a base fabric 2 is wound. Two types of loop-shaped protrusions 3 and 4 having different heights are woven into the base fabric 2, and are fixed so as to protrude around the core material.

  The linear contact material 5 thus configured is shaped into a spiral shape similar to a coil spring as shown in FIG. 1 in order to increase the contact efficiency between microorganisms and dissolved oxygen in the treatment tank. preferable. This contact material can be used for sewage purification with a straight line, and guide vanes etc. can be provided in the treatment tank so that a swirling flow is generated in this, but the contact material itself is processed into a spiral shape because the structure becomes complicated. Is simple and preferred.

The outer diameter r ₁ of the rotating circle viewed from the direction of the spiral central axis 13 is preferably 60 mm or more and 90 mm or less. The spiral pitch d, which is the distance traveled in the direction of the rotation axis as it goes around the rotation circle, is preferably 5 cm or more and 20 cm or less. In this range, an anaerobic atmosphere can be hardly generated while maintaining high utilization efficiency of the water treatment tank space. More preferably, it is 7 cm or more and 13 cm or less. Although the inner diameter r ₂ of the helix as small as possible is desirable from the viewpoint of volumetric efficiency, in order to suppress rise to anaerobic atmosphere is preferably set to more than 15 mm. Within this range, the spiral-shaped inner part is easily stirred.

  Next, a contact material block for fixing such a contact material in the treatment tank of the sewage purification apparatus will be described. The contact material block is configured by combining vertical and horizontal frames, and at least two of the contact material blocks that are substantially parallel to each other are fixing members to which both ends of the contact material are fixed. The material of the frame can be a corrosion-resistant plastic or metal, but it is preferable to use a metal in terms of strength. In the case of using a metal, it is necessary to use a material that can withstand corrosion in the treatment tank, and therefore, corrosion-resistant stainless steel can be used for general purposes. You may use the steel material which gave the corrosion-resistant surface treatment.

  First, an example of a frame used for such a contact material block will be described with reference to FIG. FIG. 4 is a perspective view of an example of a frame that is configured in a substantially rectangular parallelepiped in order to fix the contact material 10 by combining vertical and horizontal frames. These frames are installed and used in the treatment tank with the arrow direction in the figure as the vertical direction.

  4A includes four vertical frames 21 to 24, six upper horizontal frames 25 to 30, and six lower horizontal frames 31 to 36. They are connected by welding or bending so as to be substantially parallel or substantially orthogonal, and form a substantially rectangular parallelepiped. In addition, the lower part of the vertical direction frames 21-24 protrudes below from this rectangular parallelepiped, and becomes the leg parts 37-40.

  Of the frames constituting the frame body 20, substantially parallel 25, 27, 29, 30, 31, 33, 35, and 36 are used as fixing members for fixing both ends of the contact material. It is preferable that the contact material 10 is fixed in the treatment tank so that the spiral shaft 13 of the contact material 10 is in a substantially vertical direction so that the stirring effect by aeration from the lower part of the treatment tank is increased. Therefore, among the horizontal frames of the frame body 20, a total of eight sets of four frames, 25 and 31, 29 and 35, 30 and 36, and 27 and 33, which are substantially parallel to each other and overlap in the vertical direction are fixed members. It has become. And each of the both ends of a contact material is fixed to each of a fixing member for every group of fixing members. Thereby, the contact material is also fixed so that the spiral axis is in a substantially vertical direction. The number of fixing members of the frame and the shape of the frame are not limited to the example of FIG. 4 and may be set as appropriate according to the capacity of sewage to be treated, the conditions of the installation location, and the like.

  The fixing member of the frame 20 needs to have a large number of convex portions 41 on the surface thereof. By providing a large number of convex portions 41, when the end portion of the contact material is wrapped around and fixed to the fixing member, the contact material is not fixed to the fixing member even if the contact material receives vibration or force due to aeration over a long period of time. Difficult to shift in the length direction. As a result, the contact materials are unlikely to come into contact with each other and overlap each other, and troubles such as the generation of an anaerobic atmosphere due to displacement and the death of microorganisms are less likely to occur. This is because the end portion of the wound contact material becomes difficult to move due to being caught by the convex portion. In addition, it is arbitrary that the part which is not a convex part on the surface of a fixing member is called a recessed part, and it can also express that a recessed part is provided, without expressing that a convex part is provided. The point is that the surface of the fixing member has a shape that resists the movement of the contact material in the length direction of the fixing member, and the shape may be a shape that does not easily cause poor circulation of sewage.

  The convex portion may be provided only on the portion of the fixing member that fixes the contact material, but in order to be able to adjust the position of the contact material to an arbitrary position of the fixing member, the protrusion is provided over almost the entire length of the fixing member. It is desirable. The height at which the protrusion protrudes is preferably 0.3 mm or more and 5 mm or less. Within this range, displacement of the contact material is unlikely to occur, and anaerobic generation due to poor circulation of sewage is unlikely to occur. More preferably, it is 0.5-2.0 mm.

  Further, it is desirable that the convex portions are provided substantially periodically along the length direction of the fixing member. Here, the term “substantially periodic” means that the convex portions do not necessarily have to be provided at a precise constant period in the length direction, and there may be some variation in the interval between the convex portions. This is because there is no problem in fixing the contact material even if there is variation. By doing so, even if the contact material is fixed at any position in the length direction of the fixing member, any one of the convex portions is present in the vicinity of the fixing position, so that the positional deviation is less likely to occur. It is preferable that the space | interval between convex parts is 2.0 mm or more and 26.0 mm or less. In this range, the displacement of the contact material is unlikely to occur, and anaerobicization due to poor circulation of sewage is unlikely to occur. More preferably, it is 4.0 mm or more and 12.0 mm or less.

  In the frame body example 20 in FIG. 4A, the eight fixing members 25 and the like and all of the other frames are provided with convex portions 41 that are substantially periodically provided on the surface of the frame along the length direction of the frame. ing. FIG. 5 shows a partially enlarged view of the front end of such a frame. This is an example of a fixing member having a convex portion. FIG. 5A is a side view of the end portion of the fixing member, and FIG. 5B is a front view of the fixing member viewed from the distal end direction. The fixing member has a rod shape with a circular cross section, and a large number of convex portions 41 having a ring shape and a height h are provided on the surface at substantially constant intervals P along the length direction. Such a shape is hereinafter referred to as a bamboo brace type.

  The surface shape of the fixing member is not limited to this bamboo braid type, and various other variations are possible. For example, the screw shape shown in FIG. 6, the uneven bamboo bran shape shown in FIG. 7, or the like may be used. For example, instead of a round bar, a square bar or an angle may be provided with convex portions and concave portions substantially periodically. In short, the surface of the fixed member is provided with a shape that resists the movement of the end of the contact material in the length direction, and the shape is clogged with microorganisms and causes rot and poor circulation of sewage. If it is not such a shape.

  Here, the specific example of the fixing member shown in FIGS. 5 to 7 is a material known as a so-called deformed steel bar. When such a modified steel bar is used as a fixing member or other frame, its thickness is rigid enough not to vibrate due to the water flow generated by aeration in the treatment tank, and does not hinder the water flow in the treatment tank. It should be of a certain thickness. The size of the contact material frame is naturally determined from the size of one contact material and the number of contact materials accommodated in one frame. Therefore, the fixing member and the frame may be determined so as to have such a size and the necessary rigidity and not to disturb the sewage flow. For example, in the example described in this embodiment, it is preferably 4.0 mm or more and 38 mm or less for the convex part, and 3.0 mm or more and 36 mm or less for the concave part, and more preferably 9.0 mm or more and 18 mm or less for the convex part. It is 7 mm or more and 16 mm or less in a part.

  FIG. 4B is a view showing a frame 50 similar to FIG. 4A, but the portions excluding the fixing members 57 to 60 and 63 to 66 for fixing both ends of the contact material 10 are shown in FIG. It is different in that it is constructed using a normal angle of corrosion resistance instead of the deformed steel bar. Even in this way, the frame of the contact material block can be configured.

  The contact material block is configured by fixing the contact material to the fixing member of such a frame. FIG. 8 shows an example in which a contact material is fixed to one of the frames in FIG. 4 to form a contact material block. FIG. 8A is a top view of the contact material block, and FIG. 8B is a perspective view. In this example, 4 × 4 = 16 contact members are fixed between fixed members that are substantially parallel to each other and overlap in the vertical direction so that the spiral axis is in the vertical direction. The number of contact materials per block may be determined in consideration of the capacity of sewage treatment and the handleability of the contact material block.

  In fixing the contact material, it is necessary to fix at least both ends of the contact material. However, a fixing member may be provided and fixed at an intermediate position so that one or more intermediate portions of the contact material can be fixed. . Moreover, when the propulsion of the treatment tank is deep, a plurality of contact materials may be fixed in series in the vertical direction. The interval S between the outer peripheral surfaces of the contact material 10 is preferably as small as possible from the viewpoint of the volume utilization efficiency of the treatment tank. On the other hand, if it is too small, stirring between the outer periphery of the contact material becomes insufficient, and an anaerobic atmosphere It tends to occur. Therefore, the distance S between the outer peripheries of the contact materials is desirably 15 mm or more. The same applies to the distance between the inner wall of the treatment tank and the outer peripheral surface of the contact material.

  A method of fixing the contact material to the fixing member will be described with reference to FIG. Each of the upper and lower fixing members 25 and 31 is made of a deformed steel bar shown in FIG. 5, and each of the deformed steel bars has a plurality of convex portions 41. The contact material 10 has its upper and lower ends wound around a fixing member and fixed. At the time of winding, it is preferable to wind the contact material 10 so as to fit into the recesses other than the protrusion 41 of the deformed steel bar. Moreover, as shown in FIG. 9, you may wind so that the convex part 41 may straddle a contact material. Furthermore, the deformed steel bar and the contact material are wound so that they are as close as possible. It is desirable that the length for winding the contact material around the fixing member is a minimum length that can be reliably fixed. If the winding length is too long, the area of the contact material 10 on which microorganisms are carried decreases, and the sewage purification capability decreases. Preferably they are 1 round or more and 2 rounds or less. When the contact material is fixed to the fixing member in this way, the contact material is hardly unexpectedly dropped or displaced, and the sewage purification operation can be performed over a long period of time. Further, the fixing operation of the contact material to the fixing member can be performed relatively simply by using a simple tool, and the position adjustment of the contact material with respect to the length direction of the fixing member is easy.

  The contact material block configured as described above is installed in the treatment tank of the sewage purification apparatus to perform sewage treatment. An example of the schematic configuration of the sewage purification apparatus is shown in FIG. The sewage purification apparatus 200 includes a processing tank 210 and a sedimentation tank 220. The processing tank 210 is divided into four parts by a partition wall 211 and the like, and a contact material block 110 is installed in each part. The reason why the treatment tank is divided is that the microbial flora for purifying sewage differs depending on the purification stage. Below each contact material block 110, an aeration means 212 and the like are provided to supply oxygen to microorganisms and to stir around the contact material. The treated water 310 purified in the treatment tank 210 is transferred to the sedimentation tank 220, and insoluble components 340 such as microorganisms in the treated water are settled and removed, and then discharged as treated water 320 to the outside of the apparatus. The insoluble component 340 is withdrawn from the bottom of the sedimentation tank at any time and returned to the treatment tank by the pump 230. By returning the insoluble component 340 to the treatment tank 210, the burden of sludge treatment can be reduced.

  When the contact material reaches its end of life or some unexpected trouble occurs, maintenance is performed by replacing the contact material block. Since a plurality of contact material blocks can be accommodated in the processing tank and exchanged for each contact material block, maintenance is easy. Such a contact material block is suitable for a relatively large sewage purification apparatus. On the other hand, in the case of a relatively small sewage purification apparatus, when such a contact material block is not used and a fixing member as shown in FIG. Alternatively, the entire processing tank may be replaced. Moreover, the contact material block may be initially made large and may be divided and used as appropriate according to the size of the treatment tank. In addition, the configuration of the sewage purification apparatus is not limited to the above specific example, but can take various variations depending on the content and scale of the sewage, including the number of divisions of the treatment tank, and is not particularly limited. Absent. Hereinafter, the present invention will be described more specifically with reference to examples.

  An apparatus similar to that described in FIG. 10 was prepared as a sewage purification apparatus. As a frame of a contact material that can be installed in the treatment tank of this sewage purification apparatus, a frame similar to that shown in FIG. 4B was combined with several types of stainless steel to assemble a frame. L-shaped steel is used for the vertical bar, and the horizontal bar (fixing member) to which the string-like contact material is attached is stainless steel deformed steel bar (manufactured by Daido Steel Co., Ltd., stainless steel rebar (deformed bar steel), JIS G4303 (stainless steel bar) Of the dimension D13 is used. The thickness of the convex portion of this deformed steel bar was 13.8 mm, the thickness of the concave portion was 12.1 mm, the height of the convex portion was 0.65 mm, and the interval between the convex portions was 8.6 mm. The height of the frame is a height at which the frame body is submerged at the depth of the treatment water tank of the sewage purification apparatus.

Separately, a spiral contact material as shown in FIG. 1 was prepared. As the core material of the contact material, a copper wire that is a flexible single wire and having a diameter of 4.3 mm in which polyvinyl chloride is coated is prepared. Further, each of 2- (2′-hydroxy-3′-t-butyl-5′-methylphenyl) -5-chlorobenzotriazole, SF green, and citric acid was 0.3 wt% with respect to the polyvinylidene chloride resin. After mixing with polyvinylidene chloride resin so as to be 0.5 wt% and 0.5 wt%, the mixture was kneaded and then spun to obtain a fiber having a thickness of 105 dtex. Further, a long polyester woven ribbon having a width of 5 mm was prepared as a base fabric. A pile woven fabric was prepared by weaving 10 fibers obtained above into a base fabric so that a bundle of loop-shaped projections having a height of approximately 14 mm was 36 bundles per 1 cm ² . The loop-shaped protrusions protrude outward, and the ribbon was wound around the core material without gaps so as to form a spiral, and fixed so that the ribbon could not be unwound at both ends of the metal wire. This was processed into a spiral shape having an outer diameter of about 85 mm and an inner diameter of about 21 mm, and a pitch around the helical rotation axis of about 11 cm to obtain a contact material.

  The contact material was passed between the upper and lower fixing members of the frame body, and the upper end and the lower end were wound around the fixing member and fixed as shown in FIG. Subsequently, the installation interval of the helical fiber contact material was adjusted so that the interval between the tips of the loop-shaped projections was 30 mm, and a plurality of contact materials were similarly fixed to obtain a contact material block. Similarly, four contact material blocks were prepared.

  This contact material block was installed in each of the treatment tanks of the sewage purification apparatus, and sewage and aerated air were appropriately supplied to perform continuous operation of sewage purification for 3 years. Thereafter, when the treatment tank was opened and the contact material was observed, all the contact materials remained in their original fixed positions, and no displacement occurred. Moreover, the blackening phenomenon accompanying the generation | occurrence | production of an anaerobic atmosphere was not produced.

It is the schematic diagram which looked at the example of the contact material from the direction orthogonal to the (a) spiral axis direction, and (b) the spiral axis. It is a schematic diagram of an example of the pile fabric used for a contact material. It is a schematic diagram of sectional drawing of an example of a contact material. It is the perspective view which showed the outline | summary structure of the 2 examples of a frame. It is the figure which showed the structure of an example of a fixing member. It is the figure which showed the structure of the other example of a fixing member. It is the figure which showed the structure of the other example of a fixing member. It is the (a) top view and (b) perspective view which showed typically the schematic structure of an example of the contact material block. It is the figure which showed an example of the fixation structure of a contact material. It is the conceptual diagram which showed schematic structure of an example of the sewage purification apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pile fabric 2 Base fabric 3, 4 Loop-shaped protrusion 5 Linear contact material 6 Metal single wire 7 Polyvinyl chloride resin layer 10 Contact material 11 Core material 12 Loop-shaped protrusion 13 Central axis (spiral axis)
20 Frame 21-24 Vertical frame 25-30 Horizontal frame (4 of them are fixed members)
31-36 Horizontal frame (4 of them are fixed members)
37-40 Leg 41 Convex 50 Frame 57-60 Upper Fixing Member 63-66 Lower Fixing Member 67-70 Leg 80, 90, 100 Fixing Member 91, 101, 102 Protrusion 110 Contact Material Block 120 Contact material fixing structure 200 Sewage purification device 210 Treatment tank 211, 213, 214 Partition 212, 215 Aeration means 220 Precipitation tank 230 Pump 231 Return line 300, 301 Sewage 310, 330 Treated water 320 Treated water 340 Insoluble component

Claims (5)

A contact material composed of a core material and a number of loop-shaped protrusions provided on the surface of the core material is a sewage purification apparatus in which a plurality of contact materials are fixed in a treatment tank, wherein the core material is flexible, The contact material is fixed by being wound around a rod-shaped fixing member provided at least at both ends in the treatment tank, and the rod-shaped fixing member is a corrosion-resistant deformed steel bar having a large number of convex portions on the surface. A sewage purification apparatus characterized by that.   The sewage purification apparatus according to claim 1, wherein the convex portion is provided substantially periodically along a length direction of the fixing member.   The sewage purification apparatus according to claim 1 or 2, wherein the convex portion has a height of 0.3 mm or more and 5 mm or less, and an interval in a length direction of the fixing member is 2 mm or more and 26 mm or less. The sewage purification apparatus according to any one of claims 1 to 3 , wherein sewage purification is performed by microorganisms carried on the contact material. A substantially rectangular parallelepiped frame having a frame combined vertically and horizontally, a contact material consisting of a core material and a large number of loop-shaped protrusions provided on the surface of the core material is a plurality of fixed contact material blocks, The core material is flexible, and at least two of the frames that are substantially parallel to each other are rod-shaped fixing members, and at least both ends of the contact material are the at least two rod-shaped fixing members. A contact material block, wherein the bar-shaped fixing member is a corrosion-resistant deformed steel bar having a large number of projections on the surface thereof.

Images