JP2014133187A - Rotary disk water treatment apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve problems of a rotary disk apparatus as an installation intended for sludge reduction, energy saving and low costs in an organic wastewater treatment apparatus, including peeling of organisms on the disk, essential requirement of an additional installation for phosphorus recovery and maintenance of the installation for phosphorus recovery.SOLUTION: A rotary disk apparatus for wastewater treatment uses parts formed by cutting a spiral film element. A disk composed of a plurality of cut spiral films combined in a flat surface in a multistage form is arranged and fixed between an outer peripheral cylinder and a central axis arranged in the central part to form a multistage spiral film disk, and the multistage spiral film disks are fixed to a rotation shaft at constant intervals to form a rotary disk apparatus for wastewater treatment having a plurality of the multistage film disks. A suction pipe for recovering aerobic organisms inhabiting on the surface of a multistage spiral film disk is arranged between a multistage spiral film disk and another adjacent multistage spiral film disk, and a suction device connected to the suction pipe is also provided.

Description

  The present invention relates to wastewater treatment having an organic component, and relates to a system using a biodegradation method by an aerobic organism and an anaerobic organism. Supplying oxygen necessary for aerobic organisms at low energy, and efficiently decomposing organic components in wastewater by both the aerobic organism environment and the anaerobic organism growth environment in areas where oxygen supply is insufficient By providing the system, sludge generation will be reduced as much as possible by promoting the food chain with a more diverse composition of organisms. Moreover, the waste water treatment apparatus which collect | recovers the phosphorus accumulate | stored in an aerobic organism simply is provided.

  There are various types of organic wastewater treatment systems, many of which are problems of oxygen supply kinetic energy for aerobic organisms, treatment of surplus sludge, which is the main component of aerobic organisms, and useful issues that have become a global issue Economical and environmental resources, such as the problem of collecting and recycling phosphorus, are problems facing organic wastewater treatment facilities. (For example, refer to Patent Document 1) As a technique for this, a fixed bed type processing apparatus that mainly immobilizes aerobic organisms, a fluid type processing apparatus that traps and flows aerobic organisms in a carrier that can float, and a rotating disk type apparatus. There are known examples of water treatment techniques such as. (For example, see Patent Document 2, Patent Document 3, Non-Patent Document 1, and Non-Patent Document 2)

  The widely used activated sludge method has few types of aerobic organisms, and physical and chemical methods are necessary for volume reduction of sludge, and there are few introduction examples from the economical aspect. Further, since a large amount of oxygen supply power energy is required for the supply of dissolved oxygen required by aerobic organisms, various methods have been proposed from this aspect, but the energy saving effect is limited. As these measures, fixed-bed wastewater treatment and rotating disk devices have been developed as biological immobilization methods that can increase various types of aerobic organisms. The rotating disk method uses the energy required to supply oxygen. It is a system with a small amount of generated excess sludge. (For example, see Non-Patent Document 1) However, in many wastewater treatment methods, the recovery of phosphorus contained in wastewater could not be performed unless a special phosphorus recovery system was installed. (For example, see Patent Document 4 and Non-Patent Document 1)

  Various shapes of disks have been developed for the rotating disk type device, and the materials are also various. Further, since the wastewater treatment capacity depends on the area of the rotating disk, mechanical structural improvements such as a method of increasing the weight of the rotating disk and a method of increasing the strength of the rotating shaft can be seen. (Refer to Patent Document 5, Non-Patent Document 1, and Non-Patent Document 2) Also, a large amount of wastewater treatment requires special personnel work other than the response by controlling the number of rotating disk devices and the periodic maintenance of the drive rotating unit. Not appreciated. (Refer to Non-Patent Document 1) However, as the point that the diffusion is not progressing compared with the activated sludge method, with the growth of aerobic organisms on the surface of the disk, the accumulated thickness of the aerobic organisms increased, Air permeation through the biofilm is insufficient, so that dissolved oxygen is deficient inside the biological layer, facultative anaerobic bacteria on the surface of the disk grow excessively, and hydrogen sulfide is generated due to cell decomposition and decay. The phenomenon of exfoliation of aerobic organisms on the surface often occurs. As a result, since the aerobic organisms peeled off in the effluent water from the wastewater treatment device float, it is a disadvantage that the SS concentration becomes higher than other treatment methods. (For example, see Non-Patent Document 1)

  In organic wastewater treatment, according to the rotating disk method, BOD, nitrification, denitrification, and dephosphorization processes are performed in the order of BOD treatment, nitrification treatment, denitrification treatment, and dephosphorization treatment. Here, BOD processing is mainly performed in the former stage of the rotating disk, and nitrification proceeds in the latter stage. Further, since the denitrification action is performed by anaerobic microorganisms, it is performed by a method of completely immersing the rotating disk in waste water and a method of sealing the rotating disk in an oxygen-free room. (Refer to Non-Patent Document 1 and Non-Patent Document 3.) Further, the recovery of phosphorus is a recovery method of phosphorus dissolved in the waste water by using a conventional coagulant such as aluminum sulfate or polyaluminum oxide as an aggregate precipitate. A method for recovering iron phosphate precipitates using iron ions has been carried out. (For example, see Patent Document 4 and Non-Patent Document 1)

  In the rotating disk type processing apparatus, since a large amount of aerobic organisms propagate on the disk surface in the inflow and drainage section, the biofilm thickness tends to increase. To cope with this, a device has been devised in which the interval between the disks is widened before the rotating disc in the inflow and drainage section, and the interval between the discs is narrowed after the rotating disc where the decrease in BOD concentration and aerobic growth is reduced. ing. (See Non-Patent Document 1) However, when the concentration of inflowing organic wastewater fluctuates, aerobic organisms that have abnormally grown on the rotating disk cause obstruction of the disk. , Prevention of abnormal growth by adding chemicals, change of disk rotation speed and reverse rotation, etc. are taken. (Refer to Patent Document 6 and Non-Patent Document 1) These disc space adjustments and excess organism removal measures are in reverse from the compactness and ease of management of the original device.

  Recycling plastic waste has attracted attention due to global environmental problems. Among them, in recent years, attention has been paid to a method for melting and refining waste plastic and an up-cycle system for producing another high-value-added product by utilizing a discarded plastic material. Under such circumstances, membrane separators are widely used in seawater desalination, water treatment, wastewater treatment, middle water production, liquid food production processes, etc. (see Non-Patent Document 4). While some inorganic membranes such as the above are recycled, used organic membranes are mostly discarded, and there is a demand for effective utilization methods.

Japanese Patent Laid-Open No. 5-185090 (paragraphs 0001-0006, first figure) Japanese Patent Laid-Open No. 10-216759 (paragraph 0010, first figure) JP-A-10-216760 (paragraph 0011, first figure) Japanese Patent Laying-Open No. 2003-245676 (paragraphs 0001-0007, FIG. 3) JP-A-8-290188 (paragraph 0008, first figure) JP 2002-126800 A (paragraph 0039, first figure)

Ryuichi Sudo, “Effluent Treatment by Microbial Immobilization”, Industrial Water Research Committee, 1988 Nishiru Kiyoshi, Araki Hiroyuki and Koga Kenichi “Development of Organic Oxidation, Nitrification, and Denitrification Method by Alternate Flow Multi-tank Semi Submersible Rotating Disc Method” Kagoshima National College of Technology Research Report 34, 1999 Nishiru Kiyoshi, Mizumoto Aika, Higashi Takuma, Nakahara Hiroki “Organic Oxidation, Nitrification, Denitrification Using a Rotating Disc and Carrier” Kagoshima National College of Technology Research Report 45, 2010 Directed by Mikiharu Matsumoto, “Practical membrane separation technology for users”, Nikkan Kogyo Shimbun, 1996

  However, organic wastewater treatment facilities using the microorganism immobilization method can inhabit a variety of microorganisms compared to the widely used activated sludge method, and can be used as a trickling filter method, contact aeration method, and rotating disk method. It has been. Among them, the rotating disk method is characterized by the method of supplying oxygen to aerobic organisms, and it is possible to supply oxygen by rotating at low speed while exposing about half of the disk in waste water and exposing half to the air. It is a lower energy method than aerobic microbial treatment. However, various aerobic organisms that grow on the surface of the disc have a high growth rate, and the biological membrane of the organism that has increased in thickness cuts off the oxygen supply and becomes oxygen deficient as it approaches the disc surface. Is a physical phenomenon in which a facultative anaerobe grows, kills microorganisms in that area, and hydrogen sulfide is generated, reducing the adhesion between the aerobic and facultative anaerobes. There was a problem of falling off the board. Thereby, even if the quality of the organic waste water can be improved by biological treatment, the secondary treatment of the separation operation is indispensable because SS flocs of aerobic organisms that have fallen out enter the discharge water.

  The growth of aerobic organisms growing on the rotating disk surface and facultative anaerobic organisms growing in the absence of oxygen in the vicinity of the disk surface. In order to prevent the phenomenon of peeling off, there are troublesome operations such as high-pressure water washing, peeling work with high-pressure air, chemical addition treatment, increasing the number of rotations of the disk, and reverse rotation. In addition, the required power energy of the drive motor is increased with the increase in the weight of the rotating disk, which occurs secondarily due to this biological growth phenomenon, and a complicated maintenance problem of the drive unit has also occurred.

  The rotating disk method is a process in which organic matter in organic wastewater is oxidatively decomposed by aerobic organisms, and the growth of microorganisms itself proceeds in an oxygen atmosphere. The stage is broadly divided into oxidative degradation of hydrocarbon substrates in wastewater, growth by cell synthesis using ammonia, and finally release of ammonia by cell autolysis. The decomposition of organic (ammonia) nitrogen is oxidatively decomposed by aerobic bacteria and proceeds stepwise with nitrite nitrogen and nitrate nitrogen. This process is the role of aerobic organisms in the rotating disk device, but nitrite nitrogen and nitrate nitrogen cannot be decomposed into inorganic nitrogen gas unless they are decomposed by denitrifying bacteria of facultative anaerobes. As a method of performing this operation by the rotating disk method, a method of immersing the entire rotating disk in the treated waste water, a method of blocking an air by providing an anaerobic chamber around the rotating disk, and a large outer diameter of the rotating disk It is divided into two parts, a diameter and a small diameter, and it is incorporated into the rotating shaft, the entire small diameter is immersed, a part of the large diameter is exposed to the air, and a small diameter inside the rotating donut-shaped disk having a large outer diameter like a donut The denitrification process is performed by cultivating facultative anaerobic denitrifying bacteria by various methods such as a rotating disk method with a complicated shape in which the internal organs are completely immersed, with a built-in rotating disk. However, there is a problem that the apparatus is complicated and the apparatus cost increases and maintenance time and cost increase.

  Phosphorus is one of useful substances in the BOD component in organic waste water. Conventional phosphorus recovery methods include activated carbon adsorption, coagulation and precipitation using aluminum sulfate and polyaluminum oxide coagulants, and iron phosphate precipitation recovery using iron ions, all of which are dissolved in wastewater. It is aimed at recovering phosphorus, which requires new equipment and expensive materials for the recovery, raising the cost of equipment and increasing maintenance costs. In addition, accumulation of phosphorus is expected in aerobic microorganisms in the fixed bed, fluidized bed, and rotating disk apparatus for inhabiting minute metazoans (such as rotifers, nematodes, and oligochaetes) that use the food chain. However, a direct recovery method for the phosphorus accumulating organism has not yet been established.

  As a small and medium-sized wastewater treatment facility for organic wastewater treatment, a rotary disk device RBC (Rotary Biological Contactor) has been developed in Europe and the United States since 1960 as a small device that can solve all the problems of oxygen supply energy reduction, excess sludge reduction, and personnel reduction. Since then it has been developed and popularized. However, in Europe and the United States, which have vast land for large-scale wastewater treatment, large-scale equipment with a large outer diameter and a large number of discs can be arranged in multiple stages, but there are restrictions on the installation area. It is not suitable for. The basic problem is that the amount of wastewater treatment is proportional to the disc area, and various shapes of discs have been devised as an improvement method. However, there is a three-dimensional structure for the area increase method. Due to the small amount, there was a limit to the increase in wastewater treatment volume.

  Of the membrane modules used in various applications, the spiral membrane is the most widely used. Plastic components are high-value-added plastics that are used for food and pharmaceutical products, chemical resistance, heat resistance, etc., and their durability is much longer than the service life even when discarded. ing. However, used spiral films are treated as plastic waste, and most of them have not been effectively used. At the same time, users and manufacturers have had difficulty in disposal due to the burden of processing costs and consideration of environmental issues.

  The present invention is intended to solve such a conventional problem, and it is possible to efficiently grow an aerobic organism and a facultative anaerobic organism using a used spiral membrane module, and to accumulate phosphorus accumulated in the organism. The object is to provide an energy-saving and low-cost wastewater treatment device by simply collecting.

  The present invention uses a part obtained by cutting a used spiral film element, and a multi-stage disk in which a plurality of cut spiral films are combined in a plane in a multistage manner is arranged and fixed between an outer peripheral cylinder and a central axis disposed in a central part. The present invention provides a rotating disk device for wastewater treatment having a plurality of multi-stage spiral film disks by fixing the spiral film disks to a rotating shaft at regular intervals.

  The cut spiral membrane is made of a plastic material having excellent durability, and uses a 4, 6, 8-inch spiral membrane element whose size is the world standard, and is perpendicular to the water collecting pipe at the center. The thickness is cut to 1/100 to 1/20 of the total length of the spiral membrane element, and a small hole of 1/2 to 1/50 of the thickness is penetrated from the center of the thickness to the center of the water collection pipe of the spiral membrane disk. By cutting the spiral membrane disk into a round bar and pipe of a size that can pass through this small hole, and combining the cut spiral membrane of any size, it is arranged without any gap in the cylinder on the outer periphery of the disc, and the cut spiral membrane disk A round bar that penetrates the pipe and both ends of the pipe are fixed to the outer circumferential cylinder of the disk, so that a plurality of skewered and cut spiral membrane disks are used. A bearing unit in which a spiral film disk is a single disk, and 20-40% of the outer diameter of the rotating disk composed of a plurality of disks is immersed in drainage, and is provided on both sides of the central axis of the rotating disk. And a rotating disk device for wastewater treatment that is rotated at 1 to 15 rpm by a drive motor.

  A suction pipe for collecting aerobic organisms that inhabit the surface of the multistage spiral film disk is mounted at an interval between the one multistage spiral film disk and another adjacent multistage spiral film disk, and the suction pipe The rotating disk type apparatus provided with the suction device connected to is provided.

  In place of the cut spiral film, a rotating disk device for water treatment is provided that combines a plurality of one disk composed of a multistage disk made of a porous material disk having the same outer diameter and thickness. .

  In place of the cut spiral film, a rotating disk device for water treatment is provided which is a combination of a plurality of single disks composed of a multi-stage polyhedron having a polyhedron cross section of a porous material having the same thickness.

In addition, this invention is not limited to the said used spiral film | membrane, For example, the following are also included.
(1) Those manufactured for the present invention other than the used spiral film may be used.
(2) Although the said example of application applies this invention to waste water treatment, it can be used for any microorganism culture apparatus.

  According to the present invention, various aerobic organisms adhere to and grow on the uneven surface of the cut spiral membrane disk as the wastewater treatment proceeds, and promote the biooxidation of BOD and COD components in the wastewater, and at the same time, the cut spiral Since denitrification reaction proceeds simultaneously by facultative anaerobic bacteria growing inside the disk and stable decomposition of nitrogen components can be promoted, peeling of various organisms from the disk surface can be prevented.

  By dividing the growth area of aerobic organisms and facultative anaerobic organisms on the rotating disk surface, and by collecting the proliferated aerobic organisms, the generational change of aerobic organisms is stabilized, and from the rotating disk surface There is no loss and the decomposition of BOD and COD components in the wastewater is stable. For this reason, there is no increase in the weight of the rotating disk, there is no increase in driving power energy necessary for supplying oxygen to the aerobic organisms due to rotation, and the maintenance of the driving part may be periodic, and operation management is extremely easy It is.

  The phosphorus component in the organic wastewater is transferred between the aerobic organism growing on the surface of the disk and the anaerobic organism growing inside the disc in the multi-spiral membrane disk of the present invention, and the phosphorus component is concentrated as the aerobic organism grows. Will be in the form. Since a suction device capable of sucking and removing this organism group according to the growth of the aerobic organism is installed, the phosphorus component in the organic wastewater is effectively recovered, and the recovered organism group is used as a useful phosphorus-containing organic fertilizer. Can be used.

The length of the 4, 6, 8-inch spiral film element having a standardized outer diameter is also standardized to 38-40 inches. The area of each element is different in thickness of the stock passage spacer, approximately 4-7m ^2, 11-21m ^2, has a large area and 20-37m ^2. For example, when a multi-stage disk having a diameter of 2 m is manufactured by combining modules of 4, 6, and 8 inches by cutting to a thickness of 20 mm, 52 areas of a normal flat disk are approximately 6 m ² and 52 inches and 6 inches are obtained. The area of the multi-stage disk produced by combining 8 pieces and 4 inches is about 36 m ² , which is a 6 times increase in contact area. Due to the three-dimensional increase in the contact area, a large amount of waste water can be treated with a compact rotating disk device.

  Spiral membranes used in the present invention may be used for any purpose, and those that are normally discarded after reaching the membrane exchange life are suitable. By utilizing the dense structure, an excellent multistage It can be utilized in wastewater treatment facilities as a rotating disk device composed of a spiral membrane disk. As a result, it is possible to up-cycle from what is conventionally treated as unnecessary plastic waste to use of a member of a wastewater treatment apparatus which is a high value-added product.

FIG. 1 is a diagram showing a rotating disk device using a multi-stage spiral film disk. FIG. 2 is a structural diagram of the spiral film element. FIG. 3 is a cut-part view of the spiral film element. FIG. 4 is a multi-stage spiral film disk component and its assembly drawing. FIG. 5 is a disk component diagram. FIG. 6 shows an apparatus for recovering organisms on the surface of a multi-stage spiral film disk.

  FIG. 1 is a diagram of a rotating disk device incorporating a multi-stage spiral film disk of the present invention. FIG. 2 shows a structural diagram of a widely used spiral film element. FIG. 3 is a cut-part view of a spiral film element cut, FIG. 4 is a multi-stage spiral film disk component incorporating the cut part and its assembly, FIG. 5 is a disk component figure, and FIG. 6 is a multi-stage spiral film disk surface. It is an apparatus figure which collects the living thing.

  FIG. 1 is an overall view of a rotating disk device 100 incorporating a multistage spiral membrane disk 400. A drainage storage tank 1 for storing drainage has a drainage inlet 2 and drainage outlet 3 on both sides. In this drainage storage tank 1, a large number of disks 4 having a central shaft 5 penetrating a plurality of disks 4 are arranged and supported by bearings 6 arranged at both ends of the drainage storage tank 1. A sprocket 7, a chain 8, and a sprocket 7 attached to a motor 9 are connected to one side of the central shaft 5, and the disk 4 is rotated by driving the motor. In addition, a suction pipe 10 is provided for sucking and removing organisms attached to the rotating disk 4.

  FIG. 2 shows a spiral film element 200 constituting the disc 4 described in Non-Patent Document 4. RO, NF, UF membranes are used in seawater desalination, UF membranes are mainly used in the automobile industry, MF, UF, NF, RO membranes are widely used in the food industry, and MF, UF, NF membranes in waterworks Is indispensable. Among various types of membrane modules, the spiral membrane element 200 is most used. The film 11 is a set of two sheets, and a spacer 12 is incorporated inside. A pair of the flat membrane 11 and the spacer 12 joined at the three end surfaces with an adhesive is joined to the central water collecting pipe 13 with an adhesive. Further, another spacer 14 is interposed between another flat membrane 11 and a set of spacers 12, and is similarly bonded to the water collecting pipe 13. A plurality of these membranes and spacers are wound around the water collecting pipe 13 to form a spiral membrane element 200. In FIG. 2, a spear-shaped part of the sword is attached to the end face of the spiral film element 200. This name is ATD (Anti-Telescope-Device) 15, and its role is the pressure applied to the stock solution inlet. This is a component that prevents the spiral film element 200 from popping out like a telescope. The MF, UF, NF, and RO film materials are organic films such as PAN, PE, PES, PS, and PTFE, and the constituent spacers are made of materials such as PP and PE. Various adhesives are used to join these components. As described above, an unlimited material is used depending on the application, but the resulting spiral film element 200 has a standardized outer diameter and length. Moreover, the water collecting pipe 13 in which the membrane filtrate is collected has small holes at regular intervals, and the filtrate that has passed through the membrane 11 passes through the holes. This water collecting pipe 13 is also standardized. The widely used spiral film element 200 has three types of outer diameters of 8-inch, 6-inch, and 4-inch, and the length is standardized to 38-40 inches.

  FIG. 3 is a spiral membrane 300 obtained by cutting the spiral membrane element 200 of FIG. 2 at a right angle to the water collecting tube 13, and the cut surface 16, the cut outer peripheral portion 17, the cut water collecting tube 18, and the cut outer peripheral portion 17 from the center. FIG. 4 is a component diagram that configures a multistage spiral disk 400 with a drilled hole 19 that passes through the center of a water pipe 18. The outer diameter is standardized to three types of 8-inch, 6-inch and 4-inch, the thickness of the cut spiral film 300 is 10-50 mm, and the drill hole 19 is set to 5-20 mm according to this thickness. .

  FIG. 4 is a component diagram of the multi-stage spiral film disc 400 using the cut spiral film 300 of FIG. Various cut spiral films 300 such as a 4-inch spiral film 20, a 6-inch spiral film 21, and an 8-inch spiral film 22 are used, and a plurality of rods 23 are formed by the round bars 23 penetrating the drill holes 19 in the cut spiral film 300 shown in FIG. The individual pieces 20, 21, and 22 are skewered and inserted into the outer cylinder 24. This cylinder 24 has a bearing tube 25 shaped so as to be fitted to the center shaft 5 of the rotating disk device 1 of FIG. 1, and is fixed by welding to a flat bar 26 and a cylinder 24 for fixing it. Further, the flat bar 26 is provided with a fixing hole 27 through which the round bar 23 can pass, so that the plurality of cut spiral films 300 are fixed and the strength is increased. The outer diameter of the cylinder 24 is determined by the area required for wastewater treatment, and 1.5 to 5.0 m is empirically determined to be practical.

  FIG. 5 shows the details of the components of the multi-stage spiral film disk 400 constituting the rotating disk device 1. In order to mount several kinds of cut spiral film 300, the rigidity of the entire disk is required, and the framework is shown. . The cylinder 24 and the bearing tube 25 are welded with a flat bar 26 to give strength. The flat bar 26 is provided with a fixing hole 27 through which the round bar 23 can pass, and a similar fixing hole 27 is also formed on the surface of the cylinder 24. The round bar 23 passes through the fixing hole 27 of the flat bar 26 and the cylinder 24 on both sides while avoiding the bearing tube 25, and is fixed by the split pin 29 inserted into the pin hole 28 previously opened in the round bar 23 of the penetrating portion. Is done.

  FIG. 6 shows a system for recovering organisms on the surface of the multi-stage spiral membrane disk 400. A plurality of discs 4 are fixed to the central shaft 5 and are slowly rotating at a speed of 1-10 rpm. Mainly aerobic organisms that decompose organic substances in the wastewater are growing on the surface of the multi-stage spiral film disk 400 that constitutes the disk 4, and a suction removal pipe 10 having a slit nozzle is connected to the growth. Two are installed on both sides of the multi-stage spiral membrane disk 400, and the aerobic organisms are collected by adjusting the suction force according to the rotation of the multi-stage spiral membrane disk 400. A collecting pipe 30 is connected to the subsequent stage of the suction removing pipe 10, and aerobic organisms are collected together with drainage into the suction device 32 via a flexible hose 31.

  The above invention is applicable to organic wastewater treatment including BOD and COD components such as food factory wastewater, domestic wastewater, agricultural wastewater, fishery industry, and various animal wastewater. Continuous processing is possible, and phosphorus accumulated at a high concentration in aerobic organisms growing on a multi-stage spiral membrane disk can be recovered by a suction recovery device using the rotation of the disk. In addition, the cutting spiral membrane member, which is the most important component of the multi-stage spiral membrane disk, utilizes the used spiral membrane element, and thus has an important meaning in the construction of an up-cycle system for waste industrial products that have been attracting attention in recent years. have. In addition, although this invention showed the usefulness as utilization to the waste water treatment which paid its attention to the aerobic organism, utilization to the anaerobic fermentation apparatus by absolute anaerobic bacteria, and also to all fermentation apparatuses used for foodstuffs and pharmaceutical manufacture Application is also possible, and the energy saving advantage of the rotating disk device in low-speed rotation operation does not change in any field.

1 Treatment Drainage Tank 2 Drainage Inlet 3 Drainage Outlet 4 Disc 5 Rotating Shaft
6 Rotating bearing 7 Sprocket 8 Chain 9 Motor 10 Suction pipe 11 Flat membrane 12 Membrane permeate spacer 13 Water collecting tube 14 Stock solution side spacer 15 ATD reinforcing support 16 Spiral membrane cut surface 17 Cut spiral membrane outer peripheral surface 18 Water collecting tube 19 Fixing hole 20 Cutting part of 4-inch spiral film element 21 Cutting part of 6-inch spiral film element 22 Cutting part of 8-inch spiral film element 23 Round bar or pipe 24 Cylinder 25 Center axis 26 Disc and center axis connection fixing plate; Flat bar 27 Through-hole 28 Pin hole of round bar and pipe 29 Split pin 30 Suction collecting pipe 31 Suction flexible hose 32 Suction device 100 Rotating disk device using multi-stage spiral membrane disc 200 spiral membrane lement
300 cut spiral membrane 400 multi-stage spiral membrane disc

Claims (5)

  A multi-stage spiral film disk is formed by using a part obtained by cutting a spiral film element, and a multi-stage spiral film disk, in which a plurality of cut spiral films are combined in multiple stages on a plane and fixed between the outer cylinder and the central axis at the center. A rotating disk device for water treatment having a plurality of multi-stage spiral film disks fixed to a rotating shaft.   The cut spiral membrane of claim 1 is made of a plastic material having excellent durability, and uses a 4, 6, or 8-inch spiral membrane element whose cylindrical size is the world standard, and a water collecting pipe at the center thereof. Is a size obtained by cutting the thickness to 1/100 to 1/20 of the total length of the spiral membrane element, and a small hole of 1/2 to 1/50 of the thickness is from the thickness center to the center of the water collecting pipe of the spiral membrane disk. By cutting the spiral membrane disk with a round bar and pipe of a size that can pass through the small hole and passing through the small hole, and combining the cut spiral membrane of any size, it is arranged without gaps in the cylinder on the outer periphery of the disc In addition, by fixing both ends of a round bar and a pipe penetrating the cutting spiral membrane disk to the outer peripheral cylinder of the disc, a plurality of skewered cutting spiral membrane discs can be constructed. The multi-stage spiral film disc is made into one disc, and 20-40% of the outer diameter of the rotating disc composed of a plurality of discs is constantly immersed in the drainage, on both sides of the central axis of the rotating disc. A rotating disk device for water treatment that rotates 1 to 15 rpm by a provided bearing unit and a drive motor.   A suction pipe for recovering aerobic organisms that inhabit the surface of the multistage spiral film disk is mounted at an interval between one multistage spiral film disk adjacent to the multistage spiral film disk adjacent to the multistage spiral film disk, Rotating disk device with a suction device connected to a suction pipe.   A rotating disk device for water treatment in which a plurality of one disk composed of a multistage disk made of a porous material disk having the same outer diameter and thickness is combined in place of the cut spiral film of claim 1.   A rotating disk device for water treatment, which is a combination of a plurality of single disks each composed of a multi-stage polyhedron having a polyhedron cross section of a porous material having a similar thickness instead of the cut spiral film of claim 1.

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