Filter segment system

Abstract

Filter element (1) for a filter segment (2) of a disc filter (6), wherein the filter element (1) has a frame construction (3) and a filter medium (4), characterized in that the frame construction (3) and the filter medium (4) are separably connected to each other.

Description

[0001] The present invention relates to a filter element and a filter segment for a disc filter as well as a disc filter.

[0002] In municipal and industrial wastewater treatment and water purification, pretreatment using mechanical filtration processes is of central importance for removing coarse and medium solids in the early stages of purification. Disc filters have established themselves in this context as a proven and versatile technology, distinguished by their robust design and the possibility of continuous regeneration.

[0003] Disc filter systems typically consist of an array of several, often rotating, discs made of polymeric and / or metallic materials. The discs have one or more filter segments, each containing one or more filter elements. The discs are arranged around a central tube, which is mounted horizontally or vertically. Wastewater flows through these discs, where solids are separated in a filter medium within the filter elements. After a defined operating cycle, backwashing is initiated to remove the material deposited on the discs, thus ensuring the filter's continued performance. This cyclical operation enables continuous operation while maintaining a high level of filtration reliability.

[0004] Disc filters, in particular, can be used in pile filtration. Pile filtration is a mechanical process for separating organic and inorganic solids as well as surfactants from Newtonian and non-Newtonian fluids, especially liquids and gases, preferably water, and particularly preferably wastewater. In the broadest sense, it belongs to the processes of surface filtration, cake filtration, or precoat filtration (with a fixed auxiliary material), whereby, in addition to the sieving effect, true filtration effects occur along the depth of the pile fiber layer. Pile filtration is considered an outside-in filtration process in which raw water flows through the pile filter, removing solids that are retained both on the surface and within the pile fiber layer.Poling filtration is an important subfield of cloth filtration and is used particularly for water and wastewater treatment. In polling filtration, three-dimensional filter media, known as polling materials, are used as the filter medium. The polling filter is, for example, mounted on a disc (disc filter) consisting of individual filter segments.

[0005] Filter segment systems for disc filters are known.

[0006] EP 3 932 515 A1 discloses a rotary disc filter with filter discs connected to a central tube. The filter discs consist of several filter modules, each comprising a base frame and two filter elements, each with a filter frame and a filter surface connected to the filter frame, for example, by gluing or welding. The filter frames are detachably connected to the base frame on both sides, so that filter elements can be removed from the base frame and replaced with new ones as needed. A disadvantage of this is that a welded or glued connection is difficult to separate, which reduces the recyclability of the filter elements.

[0007] SE 515 829 C2 discloses a method for attaching a rigid or flexible filter to a dimensionally stable frame. The filter is clamped within the frame. The frame is enclosed by, for example, a U-shaped seal. The filter is connected to the frame by a seam through the legs of the U-shaped seal inside the frame. Alternatively, the seal can also be sewn to the filter outside the frame.

[0008] The object of the present invention is to optimize the known filter segment systems.

[0009] The problem is solved by a filter element for a filter segment of a disc filter, wherein the filter element has a frame construction and a filter medium, by the fact that the frame construction and the filter medium are separably connected to each other.

[0010] The frame construction is preferably designed as an angle profile, allowing the filter medium to be folded over before attachment and then mechanically fixed. Alternatively, a flat profile can also be used for the frame construction. The frame construction can be designed so that it only attains its final shape for integration into a support structure of the disc filter after being connected to the filter medium around its circumference, for example, by circumferential stitching. Biologically, chemically, and chloride-resistant composite and / or plastics such as PE, PP (optionally with glass fiber content), PVC, or PET are preferably used for the frame construction as well as the other components of the filter segment.Other plastics that could be used include: polytetrafluoroethylene (PTFE), polyetheretherketone (PEEK), polyvinylidene fluoride (PVDF), ethylene tetrafluoroethylene (ETFE), high-density polyethylene (HDPE), polypropylene (PP), polyphenylene sulfide (PPS), polysulfone (PSU), polyethersulfone (PES), polyphenylsulfone (PPSU), fluoroethylene propylene (FEP), ethylene chlorotrifluoroethylene (ECTFE), ultra-high molecular weight polyethylene (UHMWPE), polyamide (PA), polyetherketoneketone (PEKK), polymethyl methacrylate (PMMA), polyethylene terephthalate glycol (PETG), polyetherimides (PEI), polycarbonates (PC), thermoplastic polyurethane (TPU), and polyethersulfone (PES). All materials used can be manufactured to be suitable for drinking water, recyclable, and for contact with sensitive media.

[0011] The frame construction can be advantageously adapted to various supporting structures. The filter element can be designed to replace filter elements in existing disc filters.

[0012] The filter medium can be two- or three-dimensional, for example, a polyester fabric, or a two-dimensional filter medium, such as a microsieve. Advantageously, various filter media can be adapted for the filter element, regardless of their backing geometry or material properties. Furthermore, the filter medium can also be applied to the frame structure in the form of a filter bag. The bag structure can, for example, have openings on the side opposite the filter surface and / or simply a mesh structure for stability.

[0013] It is advantageously provided that the filter medium is a polar material.

[0014] The filter element can be advantageously used for filtration of pollen.

[0015] Another embodiment of the invention consists in the frame construction and the filter medium being connected to each other by a seam and / or a Velcro system and / or a zipper and / or stapler.

[0016] The filter medium is preferably attached to the frame by circumferential sewing. The filter medium can be sewn directly onto the frame. This advantageously achieves a complete or nearly complete seal between the medium and the frame. Alternatively, or in combination, hook-and-loop fasteners, zippers, and / or stapling are also possible. During the attachment process, the filter medium can be evenly tensioned. This allows for precise adjustment of the filter medium's preload. The filter assembly and the filter medium can be quickly and easily separated, enabling fast and cost-effective recycling of the filter element after use.

[0017] Additionally or alternatively, welding, for example by ultrasonic or hot air welding and / or bonding the frame construction to the filter medium is conceivable.

[0018] The task is also solved by a filter segment of a disc filter, in that the filter segment has two filter elements and two segment halves, wherein the segment halves are separably connected by means of a connecting element, and each segment half can be connected to a filter element.

[0019] The filter segment consists of two filter elements and two segment halves, which can be joined together to form a complete segment via a central connection. The two segment halves can be identical. Each segment half simultaneously serves as a support structure for a frame on which the filter medium, preferably a three-dimensional filter medium such as a pile fabric, is fixed. Alternatively, two-dimensional filter media such as microsieves can also be used. The design is independent of the filter medium, and in particular independent of the configuration of the pile fabric, i.e., the pile fiber layer and the support material (e.g., carrier fabric).

[0020] The segment halves are designed to ensure the stability of the entire segment. Preferably, each segment half is constructed with a honeycomb and / or rectangular profile. The openings in the profiles can have an area of ​​0.5–625 cm². 2preferably 0.75 - 100 cm 2 , especially preferred from 1 - 50 cm 2 The profile can have openings with varying surface areas. These openings can be designed so that the water pressure does not significantly force the filter medium into the profile. Furthermore, egg-shaped, diamond-shaped, trapezoidal, rectangular, square, or similar profiles can be used, either in combination or in combination. Alternatively, the segment half can be designed as a plate with corresponding openings. The profile can also be connected to the segment frame of a filter segment.

[0021] The filter segment is advantageously designed for use in filtration applications with high demands on ease of maintenance, chemical resistance, and system compatibility. Its design is backward compatible with existing polyester filter systems, allowing for the replacement or retrofitting of existing units without structural modifications. All components of the filter segment can be assembled and disassembled without special tools and are fully reversible outside the filter machine. This facilitates filter media changes and the replacement of individual components, contributing to reduced maintenance and downtime. The modular segment design with separately replaceable filter media improves accessibility to rear-facing components and allows for thorough cleaning of the back without having to disassemble the filter media itself. The system is designed for recyclability.The materials used can preferably be separated by type and processed according to standard recycling procedures. Thanks to its open design, the system can be used regardless of the filter medium employed. Both three-dimensional (e.g., pile fabrics) and two-dimensional filter media (e.g., microsieves) can be adapted, irrespective of their back geometry or material properties. The frame construction can be designed so that it only acquires its final shape for integration into the respective segment half through circumferential connection with the filter medium, for example, by circumferential stitching.

[0022] Another embodiment of the invention consists in the fact that the frame construction and the segment half can be connected to each other by a detachable connection system.

[0023] The frame and the segment half can be detachably connected by a reversible connection system. The frame can be attached to the respective segment half and then detachably fixed together with the filter medium using a reversible connection system, such as a clamp, pull, and / or snap connection. The frame can be designed so that the filter medium self-tensions when the frame, including the filter medium, is connected to the segment half. It can be advantageous for the segment half to have a slight incline. After the two elements are connected, for example, by a snap connection, the filter medium is tensioned accordingly. Once the filter medium has reached the end of its service life, the filter element can be removed without special tools and replaced with a new one.Possible alternative connection systems include click, plug, screw connections, bolt-sleeve systems, magnetic connectors or eccentric connections.

[0024] A further embodiment of the invention consists in the filter segment having a segment frame, wherein the segment halves can be connected to the segment frame by means of detachable connecting elements.

[0025] The segment halves can be detachably connected to the segment frame using reversible connecting elements. Two pre-assembled segment halves, each equipped with a frame structure and a filter medium, can be joined to form a complete filter segment and inserted into the segment frame. Lateral connecting elements can be used to secure the segment within the frame. This advantageously allows for reversible and maintenance-friendly assembly / disassembly. For cleaning the substrate, for example with low- and / or high-pressure nozzles, it is sufficient to detach one segment half from the segment frame to expose the reverse side of both sides of the filter medium.

[0026] Possible connecting elements include click, plug, and screw connections, bolt-and-socket systems, magnetic connectors, or eccentric connections. The connecting element can be designed as a single-use or multi-use element and made of non-metallic materials, such as plastic and / or reinforced plastic and / or ceramic, and / or metallic materials, such as stainless steel and / or bronze. The connecting elements can be, for example, vertical, angled, or cross-shaped. The connecting elements can be designed so that either the segment half is positively connected to the frame structure of the filter medium, or the segment half is positively connected to the segment frame without the frame structure. The seal is ensured, in particular, by the circumferential stitching of the filter medium to the frame structure. For three-dimensional filter media, the sealing effect is additionally achieved through the interaction of the filter medium with the segment frame.Advantageously, no additional seal is required.

[0027] The segment frame can be equipped with a main opening on the underside, through which the solids-reduced water, which has previously entered the filter segment from the outside through the filter medium, is discharged into the central tube. The design of the opening minimizes flow losses at this point, keeping them as low as possible. A reverse filter direction is also conceivable.

[0028] The segment frame can be equipped with access points on the side opposite the central tube (top side) that allow manual and / or mechanical removal of the filter segment from the central tube / filter machine.

[0029] Another embodiment of the invention consists in the filter segment being fixable to a central tube by means of one or more tie rods.

[0030] The filter segment can be fixed to a central tube by one, two, or three tie rods. The segment halves can be designed with an internal guide for the tie rods. The central tube can be round, square, pentagonal, hexagonal, heptagonal, or octagonal, for example. These tie rods can be pre-assembled or attached together with the filter segment using a twist-lock mechanism. The filter segments, including the tie rods, can be detachably attached to the central tube using a bayonet fitting. The filter segments can be equipped with one or more separate sleeves to absorb the forces used for fixing them with the tie rods. Furthermore, the segment halves can contain a sleeve or sleeve halves.

[0031] Another embodiment of the invention consists in the fact that the pull rod is firmly connected to the filter segment.

[0032] For example, the pull rod can be pre-assembled on the filter segment. This can simplify the assembly of the filter segments onto the central tube. The pull rod does not necessarily have to be attached to the filter segment at the same location as the disc filter.

[0033] Another embodiment of the invention consists in the filter segment having no metallic components.

[0034] In particular, the filter element, the segment halves, and the segment frame can be made of a non-metallic material. In the case of a pull rod or, if applicable, a bayonet fitting, these can be made of metal.

[0035] This can advantageously simplify the recycling of the filter segments.

[0036] The problem is also solved by a disc filter with several filter segments according to the invention.

[0037] The segment frame can have a tongue-and-groove connection on the top and / or bottom and / or in between, which serves to positively lock adjacent filter segments onto a filter disc. Preferably, there is no further connection between the filter segments. One or more discs, consisting of several filter segments, can be polygonal at the outer and / or inner end, or round. The filtered water preferably flows exclusively from the interior of the respective filter segment into the central tube, without first passing into an adjacent filter segment. A filter disc, for example, consists of six, eight, or more segments and preferably has an effective filter area of ​​approximately 0.5 m². 2 , 1 m 2 , 2 m 2 , 2.5 m 2 , 5 m 2 , 7.5 m 2 or 10 m 2The filter discs are fully immersed in the medium being treated during filtration. Alternatively, partial immersion of the filter disc is also possible. The filtration process occurs through a directed flow from the outside to the inside of the filter medium into the respective filter segment. The reverse filtration direction is also conceivable.

[0038] Exemplary embodiments of the invention are described in more detail below with reference to drawings.

[0039] They show Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8, Fig. 9, Fig. 10, Fig. 11, Fig. 12, Fig. 13, Fig. 14, Fig. 15, Fig. 16, Fig. 17, Fig. 18, Fig. 19, Fig. 20, Fig. 21, Fig. 22, Fig. 23, Fig. 24, Fig. 25, Fig. 26, Fig. 27, Fig. 28, Fig. 29, Fig. 30, Fig. 31, Fig. 32, Fig. 33, Fig. 34, Fig. 35, Fig. 36, Fig. 37, Fig. 38, Fig. 39, Fig. 40, Fig. 41, Fig. 42, Fig. 43, Fig. 44, Fig. 45, Fig. 46, Fig. 47, Fig. 48, Fig. 49, Fig. 50, Fig. 51, Fig. 52, Fig. 53 to Fig. 54 different views of several filter elements, filter segments and disc filters according to the invention.

[0040] The figures show embodiments of filter elements 1 according to the invention. The filter element 1 comprises a frame structure 3 and a filter medium 4. The frame structure 3 and the filter medium 4 are detachably connected to one another. The frame structure 3 and the filter medium 4 can be connected to one another, for example, by a seam and / or a hook-and-loop fastener system and / or a zipper and / or a staple. The filter medium 4 can be a two- or three-dimensional filter medium, for example, a polyester fabric, or a two-dimensional filter medium, for example, a microsieve.

[0041] The filter element 1 is part of a filter segment 2 of a disc filter 6. The filter segment 2 has two filter elements 1 and two segment halves 5, wherein the segment halves 5 are separably connected by means of a connecting element.

[0042] The filter segment 1 has two segment halves 5, which can be joined together to form a complete segment by a central connection. The two segment halves 5 can be identical. Each segment half 5 simultaneously serves as a support structure for a frame construction 3 on which the filter medium 4 can be placed.

[0043] Each segment half 5 is designed with a honeycomb and / or rectangular profile. The openings of the profile can be designed such that the filter medium 4 is not significantly forced into the profile by the water pressure. The profile can be connected to the segment frame 9 of a filter segment 2.

[0044] The frame structure 3 and the segment half 5 are detachably connected to each other by a reversible connection system.

[0045] The filter segment 2 has a segment frame 9, wherein the segment halves 5 can be connected to the segment frame 9 by means of detachable connecting elements.

[0046] The segment frame 9 can be equipped with a main opening on the underside through which the solids-depleted water, which has previously entered the filter segment 2 from the outside through the filter medium 4, is discharged into the central tube 8.

[0047] The filter segment 2 can be fixed to a central tube 8 by means of one or more tie rods.

[0048] The segment halves 5 are designed such that an internal guide for the pull rods 8 can be provided. These pull rods 8 can, for example, be pre-assembled or attached together with the filter segment 2 by means of a rotary locking mechanism.

[0049] The segment frame 9 has a tongue-and-groove connection on its upper surface, which serves for the positive locking of adjacent filter segments 2 onto a filter disc of a disc filter 6. There is no further connection between the filter segments. A filter disc of a disc filter 6, for example, consists of six, eight, or more filter segments 2. QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] EP 3 932 515 A1

[0006] SE 515 829 C2

[0007]

Claims

[1] Filter element (1) for a filter segment (2) of a disc filter (6), wherein the filter element (1) comprises a frame structure (3) and a filter medium (4), characterized by , that the frame construction (3) and the filter medium (4) are separably connected to each other. [2] Filter element (1) according to claim 1, characterized by , that the filter medium (4) is a polar material. [3] Filter element (1) according to claim 1 or 2, characterized by , that the frame construction (3) and the filter medium (4) are connected to each other by a seam and / or a Velcro system and / or a zipper and / or stapler. [4] Filter segment (2) of a disc filter (6), characterized by , that the filter segment (2) has two filter elements (1) according to one of the preceding claims and two segment halves (5), wherein the segment halves (5) are separably connected by means of a connecting element, wherein each segment half (5) can be connected to a filter element (1). [5] Filter segment (2) according to claim 4, characterized by , that the frame structure (3) and the segment half (5) can be connected to each other by a detachable connection system. [6] Filter segment (2) according to claim 4 or 5, characterized by , that the filter segment (2) has a segment frame (9), wherein the segment halves (5) can be connected to the segment frame (9) by means of detachable connecting elements. [7] Filter segment (2) according to any one of claims 4 to 6, characterized by that the filter segment (2) can be fixed to a central tube (8) by means of one or more tie rods (7). [8] Filter segment (2) according to claim 7, characterized by , that the pull rod (7) is firmly connected to the filter segment (2). [9] Filter segment (2) according to any one of claims 4 to 8, characterized by , that the filter segment (2) has no metallic components. [10] Disc filter (6), wherein the disc filter (6) comprises a filter segment (2) according to any one of claims 4 to 9.

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