Vacuum ultraviolet / persulfate pretreatment device for relieving ultrafiltration membrane pollution

Abstract

The utility model discloses a vacuum ultraviolet / persulfate pretreatment device for relieving ultrafiltration membrane pollution, which belongs to the technical field of advanced sewage treatment and comprises an ultraviolet treatment box, a persulfate blanking box and an ultrafiltration membrane device. The persulfate discharging box is arranged above the ultraviolet treatment box and is communicated with the ultraviolet treatment box, and a plurality of vacuum ultraviolet lamp tubes are arranged in the ultraviolet treatment box in parallel. A vacuum ultraviolet lamp tube adopted in the device can split water to generate active species in situ, persulfate fed into a persulfate discharging box is activated by vacuum ultraviolet light to generate active species such as sulfate free radicals and hydroxyl free radicals, and the active species can deeply treat organic pollutants in water. The device is helpful for solving the problem of organic pollution of an ultrafiltration membrane caused by organic matters in secondary effluent of sewage in the prior art and the problems of high dosage and residual quantity of an oxidant in ultraviolet-based advanced oxidation, and can effectively improve the treatment efficiency of the ultrafiltration membrane.

Description

Technical Field

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

[0002] A large amount of domestic sewage generated by urban residents will be directly discharged after being treated in sewage treatment plants, which will cause waste of water resources and possible water environmental pollution problems. Therefore, the reuse of sewage that has been treated at the primary and secondary levels in sewage treatment plants is of great value to the environmental water resource crisis and water ecological environment protection. The reuse of secondary effluent from urban sewage is mainly achieved by deep treatment of the secondary effluent to meet the water quality requirements for reused water and use it within an appropriate range. Ultrafiltration is a filtration technology that separates colloids or suspended particles of a certain size from a solution through an ultrafiltration membrane. It has been widely used in the deep treatment of urban sewage, industrial wastewater and drinking water. However, in practical applications, membrane water treatment technology with ultrafiltration as the core still has certain limitations, such as membrane pollution problems during long-term operation, which affects the stability of production and operation of large water plants.

[0003] Ultraviolet light is widely used in disinfection units in water treatment. Conventional ultraviolet lamps usually add titanium dioxide to the wall of quartz lamps, so that 185nm vacuum ultraviolet light is shielded and only 254nm ultraviolet light is released. This process not only loses the use of 185nm vacuum ultraviolet light, but also increases production costs. Vacuum ultraviolet light with a wavelength of 100-200nm can split water to produce active species in situ. Therefore, ultraviolet lamps with high-purity quartz outer walls can simultaneously emit 185nm vacuum ultraviolet light and 254nm ultraviolet light. 185nm vacuum ultraviolet light irradiates water to produce hydroxyl radicals in situ, and 254nm ultraviolet light can activate persulfate to produce sulfate radicals and hydroxyl radicals. Hydroxyl radicals and sulfate radicals can promote the degradation of organic matter and reduce organic pollutants entering ultrafiltration membrane components, which has the potential to significantly alleviate ultrafiltration membrane pollution. At the same time, the characteristics of vacuum ultraviolet light splitting water to produce active species can effectively reduce the amount of oxidant added, residual amount and by-product content in the effluent water during ultraviolet radical oxidation. Utility Model Content

[0004] In view of this, the purpose of the utility model is to provide a vacuum ultraviolet / persulfate pretreatment device for alleviating ultrafiltration membrane contamination, pretreating organic matter by using active species produced by vacuum ultraviolet activation of persulfate, pretreating water at the front end of the ultrafiltration membrane, reducing the processing load of the ultrafiltration membrane, and improving the processing efficiency.

[0005] In order to achieve the above object, the utility model provides the following technical solutions:

[0006] The utility model comprises an ultraviolet treatment box, a persulfate feed box and an ultrafiltration membrane device. The ultraviolet treatment box is communicated with the ultrafiltration membrane device, the persulfate feed box is arranged above the ultraviolet treatment box and is communicated with the ultraviolet treatment box, and a plurality of vacuum ultraviolet lamp tubes are arranged in parallel in the ultraviolet treatment box.

[0007] Furthermore, a motor is fixedly provided at the front end of the ultraviolet treatment box, a connecting shaft is fixedly provided at the output end of the motor, the connecting shaft penetrates into the ultraviolet treatment box, a turntable with a hole is fixed at the end of the connecting shaft, the vacuum ultraviolet lamp is fixed on the turntable with a hole, and also includes a power supply column, the outer end of the connecting shaft is rotatably set on the power supply column, the outer end of the connecting shaft is provided with a positive electrode ring and a negative electrode ring, the power supply column is provided with a positive electrode bar and a negative electrode bar, and the vacuum ultraviolet lamp is powered by the power supply column.

[0008] Furthermore, a plurality of paddles are provided on the side of the perforated turntable.

[0009] Furthermore, a plurality of vertical shafts are arranged in the ultraviolet treatment box, and baffles are rotatably arranged on the vertical shafts, and the baffles are arranged in front of the movement of the paddles.

[0010] Furthermore, a torsion spring is provided on the vertical shaft to drive the baffle to return to its original position.

[0011] The beneficial effects of the utility model are:

[0012] The utility model provides an ultraviolet treatment box with a plurality of parallel vacuum ultraviolet lamp tubes, which is placed in front of the ultrafiltration membrane device to pre-treat the water flow flowing into the ultrafiltration membrane device. Ultraviolet rays promote the degradation of organic matter and reduce the organic pollutants entering the ultrafiltration membrane component, which has the potential to significantly alleviate the pollution of the ultrafiltration membrane. At the same time, the characteristic of vacuum ultraviolet light to crack water to produce active species can be used to effectively reduce the oxidant dosage, residual amount and by-product content in the effluent during the ultraviolet-based oxidation process, so as to solve the problem of organic pollution of the ultrafiltration membrane caused by organic matter in the secondary effluent of sewage in the prior art and the problem of high dosage and residual amount of oxidant in ultraviolet-based advanced oxidation. The persulfate discharged from the persulfate discharge box is further provided, and the active species such as sulfate radical and hydroxyl radical generated after the persulfate is activated by vacuum ultraviolet light can deeply treat trace and persistent organic pollutants in water; further, a rotating perforated turntable is provided at the persulfate discharge position, and the perforated turntable drives the vacuum ultraviolet lamp tube to rotate, which can effectively stir the water flow inside the ultraviolet treatment box, accelerate the mixing of persulfate and water, and accelerate the chemical reaction inside the water flow; the paddle blades further provided can diffuse the persulfate in the front section of the ultraviolet treatment box to cover the front section of the ultraviolet treatment box, which can accelerate the comprehensive mixing of persulfate and water flow, and the rotating baffle is not provided, and during the rotation of the paddle blade, the paddle blade hits the baffle blade, which further accelerates the mixing of persulfate, and the torsion spring provided on the vertical shaft can return the baffle blade to the contact and beating position with the paddle blade to ensure the continuity of the hitting mixing.

[0013] 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

[0014] In order to make the purpose, technical solution and beneficial effects of the utility model clearer, the utility model provides the following drawings for explanation:

[0015] Figure 1 This is an overall schematic diagram of the pretreatment device of the utility model embodiment;

[0016] Figure 2 This is a schematic diagram of the interior of the ultraviolet treatment box of the utility model embodiment;

[0017] Figure 3 This is a schematic diagram of the positions of the baffle and the paddle in the embodiment of the utility model;

[0018] Figure 4 This is a schematic diagram of the position of the torsion spring in an embodiment of the utility model;

[0019] Figure 5This is a detailed schematic diagram of the connecting shaft and power supply column of the embodiment of the utility model;

[0020] The markings in the attached drawings are as follows: 1. UV treatment box; 11. Vacuum UV lamp tube; 12. Vertical shaft; 13. Baffle; 14. Torsion spring; 2. Persulfate discharge box; 3. Ultrafiltration membrane device; 4. Motor; 5. Connecting shaft; 51. Positive electrode ring; 52. Negative electrode ring; 6. Perforated turntable; 61. Paddle; 7. Power supply column; 71. Positive electrode bar; 72. Negative electrode bar. DETAILED DESCRIPTION

[0021] like Figures 1 to 5 As shown, the utility model discloses a vacuum ultraviolet / persulfate pretreatment device for alleviating ultrafiltration membrane pollution, comprising an ultraviolet treatment box 1, a persulfate feed box 2 and an ultrafiltration membrane device 3, wherein the ultraviolet treatment box 1 is a cylindrical structure, and input and output water pipes are connected to the front and rear ends of the ultraviolet treatment box 1, the ultraviolet treatment box 1 is communicated with the ultrafiltration membrane device 3, the ultraviolet treatment box 1 is arranged at the front end of the ultrafiltration membrane device 3, the persulfate feed box 2 is arranged above the ultraviolet treatment box 1 and communicated with the ultraviolet treatment box 1, the persulfate feed box 2 is filled with a persulfate agent, and the connecting pipeline between the persulfate feed box 2 and the ultraviolet treatment box 1 is provided with a solenoid valve for controlling the flow rate of the persulfate agent, such as Figure 2 As shown, a plurality of vacuum ultraviolet lamps 11 are arranged in parallel in the ultraviolet treatment box 1. The vacuum ultraviolet lamps 11 are parallel to the water flow direction and are evenly distributed in the ultraviolet treatment box 1. A motor 4 is fixedly arranged at the middle position of the front end of the ultraviolet treatment box 1. A connecting shaft 5 is fixedly arranged at the output end of the motor 4. The connecting shaft 5 penetrates into the ultraviolet treatment box 1. The connecting shaft 5 and the ultraviolet treatment box 1 are rotatably sealed and connected. The sealing method can be achieved by a sealing ring. A perforated turntable 6 is fixed at the end of the connecting shaft 5. The vacuum ultraviolet lamps 11 are fixed on the perforated turntable 6. A power supply column 7 is also included. The power supply column 7 is located on the outer side of the front end of the ultraviolet treatment box 1. The outer end of the connecting shaft 5 is rotatably arranged on the power supply column 7. Figure 5 As shown, the outer end of the connecting shaft 5 is provided with a positive electrode ring 51 and a negative electrode ring 52, the power supply column 7 is provided with a positive electrode bar 71 and a negative electrode bar 72, and the vacuum ultraviolet lamp 11 is powered by the power supply column 7; further reference Figure 3 The side of the perforated turntable 6 is provided with a plurality of paddles 61, and the position of the paddles 61 is located below the output of the persulfate discharge box 2. The UV treatment box 1 is provided with a plurality of vertical shafts 12, and a baffle 13 is rotatably provided on the vertical shaft 12, and the baffle 13 is blocked in front of the movement of the paddle 61. The vertical shafts 12 are evenly distributed around the axis of the connecting shaft 5, such as Figure 4 As shown, the vertical shaft 12 is provided with a torsion spring 14 for driving the blocking piece 13 to return to its original position. Three vertical shafts 12 are provided, and six paddles 61 are provided.

[0022] The device, by setting an ultraviolet treatment box 1 with a plurality of parallel vacuum ultraviolet lamps 11, is placed in front of an ultrafiltration membrane device 3 to pre-treat the water flow into the ultrafiltration membrane device 3. The vacuum ultraviolet light promotes the degradation of organic matter and reduces the organic pollutants entering the ultrafiltration membrane assembly, which has the potential to significantly alleviate the pollution of the ultrafiltration membrane. At the same time, the characteristic of vacuum ultraviolet light to crack water and produce active species can effectively reduce the dosage and residual amount of oxidant in the ultraviolet-based oxidation process and the content of by-products in the effluent, so as to solve the problem of organic pollution of the ultrafiltration membrane caused by organic matter in the secondary effluent of sewage in the prior art and the problem of high dosage and residual amount of oxidant in ultraviolet-based advanced oxidation. The persulfate feed box 2 is further set to generate active sulfate radicals and hydroxyl radicals after the persulfate is activated by vacuum ultraviolet light. The species can deeply treat trace and persistent organic pollutants in water; further, a rotating perforated turntable 6 is set at the feeding position of persulfate, and the perforated turntable 6 drives the vacuum ultraviolet lamp 11 to rotate, which can effectively stir the water flow inside the ultraviolet treatment box 1, accelerate the mixing of persulfate and water, and accelerate the chemical reaction inside the water flow. The further set paddle 61 can diffuse the persulfate in the front section of the ultraviolet treatment box 1 and cover the front section of the ultraviolet treatment box 1, which can accelerate the comprehensive mixing of persulfate and water flow. The rotating baffle 13 is not set, and during the rotation of the paddle 61, the paddle 61 hits the baffle 13, which further accelerates the mixing of persulfate. The torsion spring 14 set on the vertical shaft 12 can return the baffle 13 to the contact and beating position with the paddle 61 to ensure the continuity of the hitting mixing.

[0023] 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 vacuum ultraviolet / persulfate pretreatment device for alleviating ultrafiltration membrane pollution, characterized in that: The invention comprises an ultraviolet treatment box (1), a persulfate feed box (2) and an ultrafiltration membrane device (3); the ultraviolet treatment box (1) is connected to the ultrafiltration membrane device (3); the persulfate feed box (2) is arranged above the ultraviolet treatment box (1) and is connected to the ultraviolet treatment box (1); and a plurality of vacuum ultraviolet lamp tubes (11) are arranged in parallel in the ultraviolet treatment box (1).

2. The vacuum ultraviolet / persulfate pretreatment device for alleviating ultrafiltration membrane pollution according to claim 1, characterized in that: The front end of the ultraviolet treatment box (1) is fixedly provided with a motor (4), the output end of the motor (4) is fixedly provided with a connecting shaft (5), the connecting shaft (5) penetrates into the ultraviolet treatment box (1), the end of the connecting shaft (5) is fixed with a rotating disk with a hole (6), the vacuum ultraviolet lamp tube (11) is fixed on the rotating disk with a hole (6), and also includes a power supply column (7), the outer end of the connecting shaft (5) is rotatably arranged on the power supply column (7), the outer end of the connecting shaft (5) is provided with a positive electrode ring (51) and a negative electrode ring (52), the power supply column (7) is provided with a positive electrode bar (71) and a negative electrode bar (72), and the vacuum ultraviolet lamp tube (11) is powered by the power supply column (7).

3. The vacuum ultraviolet / persulfate pretreatment device for alleviating ultrafiltration membrane pollution according to claim 2, characterized in that: A plurality of paddles (61) are provided on the side of the perforated rotating disk (6).

4. The vacuum ultraviolet / persulfate pretreatment device for alleviating ultrafiltration membrane pollution according to claim 3, characterized in that: A plurality of vertical shafts (12) are arranged in the ultraviolet treatment box (1), and baffles (13) are rotatably arranged on the vertical shafts (12), and the baffles (13) are arranged in front of the movement of the paddle (61).

5. The vacuum ultraviolet / persulfate pretreatment device for alleviating ultrafiltration membrane pollution according to claim 4, characterized in that: The vertical shaft (12) is provided with a torsion spring (14) for driving the blocking piece (13) to return to its original position.

Images