Composite fiber for sewage treatment filler and sewage treatment filler for aerobic pool

Abstract

The invention discloses a composite fiber for sewage treatment filler and a sewage treatment filler for an aerobic pool, wherein the composite fiber comprises a fiber bundle arranged in sequence and a coated wire arranged on the outer surface of the fiber bundle and used for constraining the fiber bundle into strands; wherein the fiber bundle comprises an inner skeleton layer and an outer hydrophilic fiber layer, the skeleton layer comprises a plurality of skeleton monofilaments, the hydrophilic fiber layer comprises a plurality of hydrophilic fiber coils which are mutually nested and respectively sleeved on the outer surface of the skeleton layer, the hydrophilic fiber coils being surrounded by hydrophilic fibers; and a sewage treatment filler made of the composite fiber for sewage treatment filler; the sewage treatment filler made of the composite fiber has not only a high specific surface area and high strength, but also is conducive to the attachment of bacteria and is not easy for the proliferation of worms, can avoid the outbreak of red nematodes while improving the growth of specialized bacteria, has a high biofilm hanging amount, and is suitable for application in aerobic pools.

Description

Technical Field

[0001] The invention relates to the technical field of sewage treatment, in particular to fillers for sewage treatment, and specifically to composite fibers for sewage treatment fillers and sewage treatment fillers for aerobic pools. Background Art

[0002] At present, sewage treatment, especially sewage treatment in aerobic pools, often uses sewage treatment fillers to improve treatment efficiency and treatment effects. However, since some red nematodes often breed in domestic sewage, and red nematodes are more suitable for survival in aerobic pools with high oxygen concentrations, the fillers used in aerobic pools in the prior art are specific types of fillers suitable for low-load water conditions such as aerobic pools. Although they have achieved a good effect of intercepting pollutants, they also intercept these small red nematodes in their nascent state, which in turn brings about the disadvantage of red nematode outbreaks in aerobic pools, and the amount of biofilm is insufficient, which greatly affects the operation of the sewage treatment system. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a new type of composite fiber for sewage treatment filler. The sewage treatment filler made of the composite fiber not only has a high specific surface area and high strength, but also is conducive to the attachment of bacteria and is not easy for insect proliferation. It can avoid the outbreak of red nematodes while improving the growth of specialized bacteria, has a high biofilm hanging amount, and is suitable for use in aerobic pools.

[0004] The present invention also provides a sewage treatment filler made of the composite fiber.

[0005] In order to achieve the above object, a technical solution adopted by the present invention is:

[0006] A composite fiber for sewage treatment filler, the composite fiber comprising fiber bundles arranged in sequence and coated wires arranged on the outer surface of the fiber bundles and used to constrain the fiber bundles into strands; wherein the fiber bundles include an internal skeleton layer and an external hydrophilic fiber layer, the skeleton layer includes a plurality of skeleton monofilaments, the hydrophilic fiber layer includes a plurality of hydrophilic fiber coils nested in each other and respectively sleeved on the outer surface of the skeleton layer, the hydrophilic fiber coils are surrounded by hydrophilic fibers.

[0007] According to some preferred aspects of the present invention, the diameter of the hydrophilic fiber coil is 1-10 mm.

[0008] Further preferably, the diameter of the hydrophilic fiber coil is 2-4 mm.

[0009] According to some preferred aspects of the present invention, the length of the mutually nested portion of two adjacent hydrophilic fiber coils is 0.5-5 mm.

[0010] According to some preferred aspects of the present invention, the width of the mutually nested portion of two adjacent hydrophilic fiber coils is 1-2 mm.

[0011] According to some preferred and specific aspects of the present invention, the hydrophilic fiber coil is in a ring shape.

[0012] According to some preferred and specific aspects of the present invention, the hydrophilic fiber comprises a fiber and a hydrophilic layer modified on the surface of the fiber.

[0013] According to some preferred aspects of the present invention, the fiber is vinylon, cotton nylon, polyester, polypropylene, acrylic fiber, polyethylene or polyvinyl chloride.

[0014] According to some specific aspects of the present invention, the hydrophilic layer is composed of hydrophilic groups modified on the surface of the fiber.

[0015] According to some specific aspects of the present invention, the method for modifying the hydrophilic groups on the fiber surface is a conventional method, such as attaching the hydrophilic groups by chemical reaction.

[0016] According to some preferred aspects of the present invention, the material of the bone monofilament is high-density polyethylene or polyethylene terephthalate.

[0017] According to some preferred aspects of the present invention, the skeleton layer is made of a plurality of skeleton monofilaments twisted and ply.

[0018] According to some preferred aspects of the present invention, the material of the coated yarn is polyester or acrylic.

[0019] According to some preferred and specific aspects of the present invention, the covering wire may be single, two, three or more.

[0020] Another technical solution provided by the present invention is a sewage treatment filler for an aerobic pool, wherein the sewage treatment filler is made of the composite fiber for sewage treatment filler described above.

[0021] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0022] Based on the drawbacks that the fillers used in aerobic pools in the prior art have insufficient biofilm and may cause red nematode outbreaks, the present invention innovatively provides a new type of composite fiber. The composite fiber is preferably provided with a skeleton layer so that the composite fiber can be made into a filler with a specific shape having a certain stability according to actual needs, and at the same time, a fiber bundle is formed by combining a fiber layer with a specific shape and being hydrophilic, and then the inner fiber bundle can be twisted into strands through an outer coating yarn to constrain the bundle from separation. On the one hand, the composite fiber has the advantages of high specific surface area and high strength, is conducive to the attachment of bacteria, has a high amount of biofilm, and is not easy to proliferate. On the other hand, the composite fiber with a specific structure can be made into a filler with a specific shape having a certain stability according to actual needs, so that young red nematodes can pass through easily, so that there are almost no young red nematodes in the aerobic pool, and there will be no problem of red nematode outbreaks due to the growth and reproduction of red nematodes, and the composite fiber is suitable for application in aerobic pools. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0024] Figure 1 This is a schematic diagram of the structure of the composite fiber used as a filler for sewage treatment according to an embodiment of the present invention;

[0025] Figure 2 It is an exemplary solution structure of a sewage treatment filler for an aerobic pool made of composite fibers in an embodiment of the present invention;

[0026] Figure 3 for Figure 2 The treatment effect diagram of sewage treatment filler applied in aerobic pool;

[0027] Figure 4 for Figure 3 An enlarged schematic diagram of

[0028] Figure 5 This is a schematic diagram of traditional bio-rope filler;

[0029] Figure 6 for Figure 5 The treatment effect diagram of traditional biological rope filler used in aerobic pool;

[0030] Figure 7 for Figure 6 An enlarged schematic diagram of

[0031] Among them, 1. Skeleton monofilament; 2. Hydrophilic fiber coil; 3. Coated wire. DETAILED DESCRIPTION

[0032] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0033] In the description of the present invention, “plurality” means at least two, for example, two, three, etc., unless otherwise clearly and specifically defined.

[0034] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] In the invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0036] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time.

[0037] The preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0038] like Figure 1As shown, this example provides a composite fiber for sewage treatment filler, which includes a fiber bundle arranged in sequence and a coating wire 3 arranged on the outer surface of the fiber bundle and used to constrain the fiber bundle into strands; wherein the fiber bundle includes an internal skeleton layer and an external hydrophilic fiber layer, the skeleton layer includes a plurality of skeleton monofilaments 1, the hydrophilic fiber layer includes a plurality of hydrophilic fiber coils 2 which are nested with each other and respectively sleeved on the outer surface of the skeleton layer, and the hydrophilic fiber coils 2 are surrounded by hydrophilic fibers.

[0039] Specifically, the diameter of the hydrophilic fiber coil 2 is 1-10 mm. Further preferably, the diameter of the hydrophilic fiber coil 2 is 2-4 mm, specifically 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm. In this example, the diameter of the hydrophilic fiber coil 2 is set to 3 mm.

[0040] Specifically, the length of the mutually nested portion of two adjacent hydrophilic fiber coils 2 is 0.5-5 mm. Further preferably, the width of the mutually nested portion of two adjacent hydrophilic fiber coils 2 is 1-2 mm, specifically 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2 mm. In this example, the length of the mutually nested portion of two adjacent hydrophilic fiber coils 2 is 1.5 mm.

[0041] In this example, the hydrophilic fiber coil 2 is in a circular shape, and a plurality of hydrophilic fiber coils 2 are nested to form a chain.

[0042] In this example, the hydrophilic fiber includes a fiber and a hydrophilic layer modified on the surface of the fiber.

[0043] Specifically, the fiber is vinylon, cotton, polyester, polypropylene, acrylic, polyethylene or polyvinyl chloride. In this example, the fiber is polyester. The hydrophilic layer is composed of hydrophilic groups modified on the surface of the fiber. The method of modifying the hydrophilic groups on the fiber surface is a conventional method, such as reacting and connecting the hydrophilic groups through a chemical reaction. The hydrophilic groups can be hydroxyl groups, etc. Hydrophilic fibers can also be commercially available, which will not be described in detail here.

[0044] Specifically, the material of the skeleton monofilament 1 is high-density polyethylene or polyethylene terephthalate, which is resistant to acid and alkali corrosion and has high strength. In this example, polyethylene terephthalate is selected.

[0045] In this example, the skeleton layer is made of a plurality of skeleton monofilaments 1 that are twisted and ply together, and the method of twisting and plying is a conventional method, for example, it can be made by forward and reverse twisting.

[0046] In this example, the material of the coating yarn 3 is polyester or acrylic, and the purpose of the coating yarn 3 is to twist the fiber bundle into strands and constrain them from separation. Specifically, the coating yarn 3 can be a single strand, two strands, three strands or more.

[0047] like Figure 2 As shown, this example also provides a sewage treatment filler for an aerobic pool. The sewage treatment filler for an aerobic pool is made of the composite fiber for sewage treatment filler described above. The preparation method is a conventional spinning process in the prior art, which will not be described in detail here.

[0048] experiment:

[0049] Will be like Figure 2 The sewage treatment filler made of the composite fiber of this example is shown, Figure 5 The traditional biological rope fillers shown are respectively used in aerobic pools under the same conditions to compare the treatment effects. The aerobic pool of a certain urban sewage plant in Suzhou was selected. The test conditions are:

[0050] Sewage temperature: 25-38 degrees Celsius;

[0051] Sewage COD: 80-110mg / L;

[0052] Dissolved oxygen: 2.0-2.5mg / L;

[0053] Suspended sludge concentration: 3500-4000mg / L;

[0054] Internal reflux ratio: 100%;

[0055] External reflux ratio: 50%;

[0056] There are a small number of adult red nematodes on the wall of the pool, visible to the naked eye, a small number of adult red nematodes in the sludge at the bottom of the pool, and no red nematodes in the suspended sludge.

[0057] Sample installation (filler installation): Length: 1000MM; Installation height: From liquid surface to one meter below the liquid, 30 cm from the pool wall.

[0058] Test time: May-July 2020. The test started on May 8 and ended on July 8.

[0059] The test results are as follows Figure 3-4 and Figure 6-7 As shown, Figure 3-4 The treatment results of the sewage treatment filler made of composite fibers in this example are as follows: Figure 3-4 It can be seen that the biofilm amount of the filler in this example (the weight of the sludge grown per unit length of filler) is 110G / 10CM; the growth amount of red nematodes: a small number of adults can be seen;

[0060] and Figure 6-7The treatment result of traditional biological rope filler is Figure 6-7 It can be seen that the biofilm amount (weight of sludge grown per unit length of filler) is 90G / 10CM; the growth amount of red nematodes: a large number of adult nematodes are enriched;

[0061] From the above, we can see that in an aerobic pool with dissolved oxygen greater than 2 mg / L, temperature higher than 25 degrees and a small amount of red nematodes, a large number of adult red nematodes accumulated on the traditional biological rope filler within 2 months, and the amount of biofilm was low, which seriously affected the operation of the sewage treatment system; under the same operating conditions, the filler in this example only bred a small number of adult red nematodes, the amount of biofilm was not affected, and it could play its due role normally.

[0062] In summary, based on the drawbacks of the prior art that the fillers used in aerobic pools have insufficient biofilm and may cause red nematode outbreaks, the present invention innovatively provides a new type of composite fiber. The composite fiber preferably sets a skeleton layer so that the composite fiber can be made into a filler with a specific shape having a certain stability according to actual needs, and at the same time, a fiber bundle is formed by combining a fiber layer with a specific shape and being hydrophilic, and the inner fiber bundle can be twisted into strands and constrained to be inseparable through the outer coating yarn. On the one hand, the composite fiber has the advantages of high specific surface area and high strength, and is conducive to the attachment of bacteria, has a high amount of biofilm, and is not easy to proliferate. On the other hand, the composite fiber with a specific structure can be made into a filler with a specific shape having a certain stability according to actual needs, thereby facilitating the passage of young red nematodes, so that there are almost no young red nematodes in the aerobic pool, and there will be no problem of red nematodes growing up and reproducing to cause red nematode outbreaks.

[0063] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with this technology to understand the contents of the present invention and implement them accordingly. They cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A composite fiber for sewage treatment filler, It is characterized in that The composite fiber includes a fiber bundle arranged in sequence and a coating wire arranged on the outer surface of the fiber bundle and used to constrain the fiber bundle into strands; wherein the fiber bundle includes an internal skeleton layer and an external hydrophilic fiber layer, the skeleton layer includes a plurality of skeletal monofilaments, the hydrophilic fiber layer includes a plurality of hydrophilic fiber coils nested in each other and respectively sleeved on the outer surface of the skeleton layer, and the hydrophilic fiber coils are surrounded by hydrophilic fibers.

2. The composite fiber for sewage treatment filler according to claim 1, It is characterized in that The diameter of the hydrophilic fiber coil is 1-10 mm.

3. The composite fiber for sewage treatment filler according to claim 2, It is characterized in that The diameter of the hydrophilic fiber coil is 2-4 mm.

4. The composite fiber for sewage treatment filler according to any one of claims 1 to 3, It is characterized in that The length of the mutually nested portion of two adjacent hydrophilic fiber coils is 0.5-5 mm.

5. The composite fiber for sewage treatment filler according to claim 4, It is characterized in that The width of the mutually nested portion of two adjacent hydrophilic fiber coils is 1-2 mm.

6. The composite fiber for sewage treatment filler according to claim 1, It is characterized in that The hydrophilic fiber comprises a fiber and a hydrophilic layer modified on the surface of the fiber.

7. The composite fiber for sewage treatment filler according to claim 6, It is characterized in that The fiber is vinylon, cotton nylon, polyester, polypropylene, acrylic fiber, polyethylene or polyvinyl chloride; and / or the hydrophilic layer is composed of hydrophilic groups modified on the surface of the fiber.

8. The composite fiber for sewage treatment filler according to claim 1, It is characterized in that The material of the skeleton monofilament is high-density polyethylene or polyethylene terephthalate; and / or the skeleton layer is made of a plurality of skeleton monofilaments twisted and ply.

9. The composite fiber for sewage treatment filler according to claim 1, It is characterized in that The material of the coated yarn is polyester or acrylic.

10. A wastewater treatment filler for an aerobic pool, It is characterized in that The sewage treatment filler is made of the composite fiber for sewage treatment filler according to any one of claims 1 to 9.

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