Overflow type vacuum ultraviolet pretreatment device for relieving pollution of ultrafiltration membrane

Abstract

The utility model discloses an overflow type vacuum ultraviolet pretreatment device for relieving pollution of ultrafiltration membrane, which comprises an ultraviolet treatment box, an ultrafiltration membrane component and a backwash pump which are communicated in sequence, the ultraviolet treatment box comprises a transversely arranged cylindrical shell, a plurality of horizontally arranged and uniformly distributed vacuum ultraviolet lamp tubes are arranged in the shell, and the vacuum ultraviolet lamp tubes are connected with the backwash pump. A support is arranged in the shell, supporting columns are arranged at the two ends of the shell respectively, and the two ends of the vacuum ultraviolet lamp tube are fixed to the supporting columns. The device adopts a vacuum ultraviolet lamp tube as a light source, can split water to produce active oxide species in situ, does not need to add an oxidizing agent, can realize effective oxidation of pollutants, realizes pretreatment in the process that water flow is conveyed to ultrafiltration through an ultraviolet treatment box, and prevents organic pollutants and biological pollutants in water from polluting an ultrafiltration membrane; according to the ultrafiltration membrane cleaning device, the treatment efficiency of the ultrafiltration membrane can be improved, and the backwashing pump is arranged, so that water flows back when the ultrafiltration membrane is cleaned, pollutants blocked on the ultrafiltration membrane are washed away, and the continuous filtering effect of the ultrafiltration membrane is guaranteed.

Description

Technical Field

[0001] The utility model belongs to the technical field of sewage deep treatment, and in particular relates to a flow-through vacuum ultraviolet pretreatment device for alleviating ultrafiltration membrane pollution. Background Art

[0002] At present, the daily amount of urban domestic sewage is large. Reusing it after treatment can not only effectively save and make full use of precious freshwater resources, but also reduce the discharge of sewage and its pollution to the water environment. It has obvious resource utilization value, environmental value and economic benefits. However, after secondary treatment, sewage still contains a large number of microorganisms and organic matter such as bacteria and viruses. In particular, various newly emerging organic pollutants seriously affect the reuse of secondary effluent, and further treatment is required to meet the water quality standards for reused water. Ultrafiltration, as a deep treatment unit after traditional secondary treatment, can further remove residual pollutants in the water, improve water quality, remove pathogenic microorganisms, make the water quality meet the reuse standards, and ensure the safety of drinking water for residents.

[0003] However, during the use of ultrafiltration membranes, organic pollutants and microorganisms present in the water will deposit on the membrane surface and clog the membrane pores, causing organic and biological pollution of the ultrafiltration membrane, resulting in a decrease in membrane flux and affecting the treatment efficiency.

[0004] Vacuum ultraviolet light is ultraviolet light with a wavelength in the range of 100 to 200nm. It has high energy. 185nm vacuum ultraviolet radiation can directly split water to produce a large number of active species, among which the hydroxyl radicals produced have strong oxidizing properties. A low-pressure mercury lamp with an outer wall made of high-purity quartz can simultaneously release ultraviolet light with a wavelength of 254nm and vacuum ultraviolet light of 185nm. 254nm ultraviolet light can destroy the DNA of organisms, causing bacteria to die or unable to reproduce, and has the potential to alleviate membrane biofouling; 185nm vacuum ultraviolet radiation produces hydroxyl radicals that can efficiently degrade organic pollutants in water, and has the potential to alleviate membrane fouling caused by organic matter. Compared with other advanced oxidation technologies based on ultraviolet light, the most significant advantage of vacuum ultraviolet light is that it can produce active species with strong oxidizing properties in situ without adding oxidants, and there is no problem of oxidant residues. There is no secondary pollution and it is green and environmentally friendly. It is a safe and efficient advanced oxidation technology that shows great potential to alleviate the pollution of ultrafiltration membranes. Utility Model Content

[0005] In view of this, the purpose of the utility model is to provide a flow-through vacuum ultraviolet pretreatment device for alleviating ultrafiltration membrane pollution, a pre-ultraviolet treatment device, which realizes pretreatment in the process of water flowing to the ultrafiltration membrane and improves the ultrafiltration membrane treatment effect.

[0006] In order to achieve the above object, the utility model provides the following technical solutions:

[0007] The utility model comprises an ultraviolet treatment box, an ultrafiltration membrane component and a backwashing pump which are connected in sequence. The ultraviolet treatment box comprises a horizontal cylindrical shell, a plurality of horizontal vacuum ultraviolet lamp tubes are arranged inside the shell, and the plurality of vacuum ultraviolet lamp tubes are evenly distributed inside the shell. A support is arranged inside the shell, and support columns are respectively arranged at both ends. Both ends of the vacuum ultraviolet lamp tube are fixed on the support columns.

[0008] Furthermore, a scraper ring is provided around the outer side of the vacuum ultraviolet lamp tube, the inner diameter of the scraper ring is larger than the outer diameter of the vacuum ultraviolet lamp tube, the front and rear ends of the shell are respectively provided with rotating tubes, the rotating tubes are sealingly and rotatably connected with fixed tubes, the fixed tubes are used to connect the water pipe and the ultrafiltration membrane assembly, and also includes a support frame, the shell is rotatably set on the support frame, a motor is provided on the support frame, the output end of the motor is provided with driving teeth, and the shell segment is provided with a circle of driven teeth meshing with the driving teeth.

[0009] Furthermore, a water retaining surface is provided on the inner side of the scraper ring, and a gap formed between the edge of the water retaining surface and the inner side of the scraper ring is larger than the inner diameter of the vacuum ultraviolet lamp tube.

[0010] Furthermore, the fixed tube includes an annular platform, the rotating tube includes an annular groove matched with the annular platform, and a sealing ring is sandwiched between the annular platform and the annular groove.

[0011] Furthermore, the edges at both ends of the scraper ring are wedge-shaped inclined surfaces.

[0012] The beneficial effects of the utility model are:

[0013] The utility model adds an ultraviolet treatment box before the original ultrafiltration membrane assembly. When water flows through the ultraviolet treatment box, the water flows inside the shell and is irradiated by a vacuum ultraviolet lamp. Active species with strong oxidizing properties can be generated in situ without adding an oxidant, and the polluted water is pretreated, and the organic pollutants and biological pollutants in the water are treated. Finally, the water is filtered through an ultrafiltration membrane to obtain pollution-free water. This method does not have problems such as residual oxidants. It is a safe and efficient advanced oxidation technology that can effectively alleviate ultrafiltration membrane pollution caused by organic pollutants and microorganisms in water, improve the processing efficiency of ultrafiltration membranes, and by setting a backwash pump, the water flow is reversed when cleaning the ultrafiltration membrane, and the pollutants blocked on the ultrafiltration membrane holes can be washed away to ensure the continuous filtering effect of the ultrafiltration membrane.

[0014] Other advantages, objectives and features of the utility model will be described in the following description and will be apparent to those skilled in the art to some extent, or those skilled in the art can be taught from the practice of the utility model. The objectives and other advantages of the utility model can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to make the purpose, technical solution and beneficial effects of the utility model clearer, the utility model is described with the following drawings:

[0016] Figure 1 This is a schematic diagram of a processing device according to an embodiment of the utility model;

[0017] Figure 2 This is a schematic diagram of the interior of the ultraviolet treatment box of the utility model embodiment;

[0018] Figure 3 This is a cross-sectional view of a fixed pipe in an embodiment of the utility model;

[0019] Figure 4 This is a detailed schematic diagram of a scraper ring according to an embodiment of the utility model;

[0020] The markings in the attached drawings are as follows: 1. UV treatment box; 11. Shell; 12. Vacuum UV lamp tube; 13. Support column; 14. Rotating tube; 141. Ring groove; 15. Fixed tube; 151. Ring platform; 16. Driven gear; 17. Sealing ring; 2. Ultrafiltration membrane assembly; 3. Backwash pump; 4. Scraper ring; 41. Water retaining surface; 5. Support frame; 51. Motor; 52. Driving gear. DETAILED DESCRIPTION

[0021] like Figures 1 to 4 As shown, the utility model discloses a flow-through vacuum ultraviolet pretreatment device for alleviating ultrafiltration membrane pollution, comprising an ultraviolet treatment box 1, an ultrafiltration membrane assembly 2 and a backwash pump 3 which are connected in sequence, the ultraviolet treatment box 1 comprising a horizontal cylindrical shell 11, the shell 11 is made of cylindrical stainless steel, a plurality of horizontal vacuum ultraviolet lamp tubes 12 are arranged inside the shell 11, and the plurality of vacuum ultraviolet lamp tubes 12 are evenly distributed inside the shell 11, the shell 11 is provided with support columns 13 at both ends, and both ends of the vacuum ultraviolet lamp tube 12 are fixed on the support columns 13.

[0022] This device adds an ultraviolet treatment box 1 before the original ultrafiltration membrane assembly 2. When water flows through the ultraviolet treatment box 1, the water flows inside the housing 11 and is irradiated by the vacuum ultraviolet lamp 12. It can produce active substances with strong oxidizing properties in situ without adding oxidants, pre-treat the polluted water, treat the organic pollutants and biological pollutants in the water, and finally, obtain pollution-free water by filtering through the ultrafiltration membrane. This method does not have the problem of residual oxidants, and is a safe and efficient advanced oxidation technology. It can effectively alleviate the ultrafiltration membrane pollution caused by organic pollutants and microorganisms in the water, improve the processing efficiency of the ultrafiltration membrane, and by setting a backwash pump 3, the water flow is reversed when cleaning the ultrafiltration membrane, which can wash away the pollutants blocked in the ultrafiltration membrane pores to ensure the continuous filtering effect of the ultrafiltration membrane.

[0023] In a further solution, Figure 2 and Figure 4 As shown, a scraper ring 4 is arranged around the outside of each vacuum ultraviolet lamp tube 12, and the inner diameter of the scraper ring 4 is larger than the outer diameter of the vacuum ultraviolet lamp tube 12. The front and rear ends of the shell 11 are respectively provided with rotating tubes 14, and the rotating tubes 14 are sealed and rotatably connected with fixed tubes 15, and the fixed tubes 15 are used to connect the water pipe and the ultrafiltration membrane assembly 2. It also includes a support frame 5, and the shell 11 is rotatably set on the support frame 5. The support frame 5 is provided with a motor 51, and the output end of the motor 51 is provided with a driving tooth 52, and the shell 11 segment is provided with a circle of driven teeth 16 meshing with the driving tooth 52.

[0024] This structure is provided with a scraper ring 4. When the water flow switches from forward flow to reverse flow, the scraper ring 4 moves back and forth on the vacuum ultraviolet lamp tube 12 with the water flow, scrapes off the pollutant deposits on the upper side of the lamp tube, and finally flows out with the reverse water. As the motor 51 rotates, the scraper ring 4 can scrape off all the outer sides of the vacuum ultraviolet lamp tube 12, thereby achieving the effect of scraping off the sediments on the outer side of the vacuum ultraviolet lamp tube 12. Through this structure, the irradiation intensity of the vacuum ultraviolet lamp tube 12 is guaranteed, the sediments are prevented from blocking the ultraviolet rays, and the excess impurities in the ultraviolet treatment device can be flushed away, thereby ensuring the cleanliness and hygiene of the ultraviolet treatment device.

[0025] For further solutions, refer to Figure 4 The inner part of the scraper ring 4 is provided with a water retaining surface 41, and the gap formed by the edge of the water retaining surface 41 and the inner side of the scraper ring 4 is larger than the inner diameter of the vacuum ultraviolet lamp tube 12. By setting the water retaining surface 41, the speed of the scraper ring 4 moving with the water flow can be accelerated, thereby improving the scraping efficiency of the scraper ring 4.

[0026] For further solutions, refer to Figure 3 The fixed pipe 15 includes a ring platform 151, and the rotating pipe 14 includes an annular groove 141 matched with the ring platform 151. A sealing ring 17 is sandwiched between the ring platform 151 and the annular groove 141. By setting the structure of the ring platform 151 and the annular groove 141, and sandwiching the sealing ring 17, the rotation between the rotating pipe 14 and the fixed pipe 15 can be ensured to be inseparable, and the sealing between the rotating pipe 14 and the fixed pipe 15 can be improved.

[0027] In a further solution, the two end edges of the scraper ring 4 are wedge-shaped bevels. By setting the wedge-shaped bevels, the two end edges of the scraper ring 4 are thinner and gradually become thicker along the middle of the scraper ring 4, which can ensure the hardness of the scraper ring 4 itself while improving the scraping effect of the scraper ring 4.

[0028] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the utility model.

Claims

1. A flow-through vacuum ultraviolet pretreatment device for alleviating ultrafiltration membrane pollution, characterized in that: The invention comprises an ultraviolet treatment box (1), an ultrafiltration membrane assembly (2) and a backwashing pump (3) which are connected in sequence. The ultraviolet treatment box (1) comprises a horizontal cylindrical shell (11). A plurality of horizontal vacuum ultraviolet lamp tubes (12) are arranged inside the shell (11). The plurality of vacuum ultraviolet lamp tubes (12) are evenly distributed inside the shell (11). A support is arranged inside the shell (11). Support columns (13) are respectively arranged at both ends. Both ends of the vacuum ultraviolet lamp tube (12) are fixed on the support columns (13).

2. The over-flow vacuum ultraviolet pretreatment device for alleviating ultrafiltration membrane pollution according to claim 1, characterized in that: A scraper ring (4) is arranged around the outside of the vacuum ultraviolet lamp tube (12), the inner diameter of the scraper ring (4) is larger than the outer diameter of the vacuum ultraviolet lamp tube (12), the front and rear ends of the housing (11) are respectively provided with rotating tubes (14), the rotating tube (14) is sealingly and rotatably connected with a fixed tube (15), the fixed tube (15) is used to connect the water pipe and the ultrafiltration membrane assembly (2), and also includes a support frame (5), the housing (11) is rotatably arranged on the support frame (5), the support frame (5) is provided with a motor (51), the output end of the motor (51) is provided with a driving tooth (52), and the housing (11) segment is provided with a circle of driven teeth (16) meshing with the driving tooth (52).

3. The over-flow vacuum ultraviolet pretreatment device for alleviating ultrafiltration membrane pollution according to claim 2, characterized in that: The inner part of the scraper ring (4) is provided with a water retaining surface (41), and the gap formed by the edge of the water retaining surface (41) and the inner side of the scraper ring (4) is larger than the inner diameter of the vacuum ultraviolet lamp tube (12).

4. The over-flow vacuum ultraviolet pretreatment device for alleviating ultrafiltration membrane pollution according to claim 3, characterized in that: The fixed tube (15) comprises an annular platform (151), the rotating tube (14) comprises an annular groove (141) matched with the annular platform (151), and a sealing ring (17) is sandwiched between the annular platform (151) and the annular groove (141).

5. The over-flow vacuum ultraviolet pretreatment device for alleviating ultrafiltration membrane pollution according to claim 4, characterized in that: The edges at both ends of the scraper ring (4) are wedge-shaped inclined surfaces.

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