A coupling device for removing organic matter and residual chlorine by multi-spectral ultraviolet light

Abstract

The present invention discloses a coupling device for removing organic matter and residual chlorine by multi-spectral ultraviolet rays, characterized in that it comprises a cylinder; a water inlet is arranged at one end of the cylinder, a water production port is arranged at the bottom, a water inlet guide plate, an irradiation zone guide plate, an adsorption zone water inlet guide plate and a water production guide zone are arranged in the cylinder; an irradiation zone is formed between the water inlet guide plate and the irradiation zone guide plate, a plurality of ultraviolet irradiation lamps are installed in the irradiation zone, an adsorption zone is formed between the adsorption zone water inlet guide plate and the inner wall of the cylinder, a connecting plate for connecting the irradiation zone and the adsorption zone is arranged between the irradiation zone guide plate and the adsorption zone water inlet guide plate, the adsorption zone is connected to the water production guide zone, and the water production guide zone is connected to the water production port. The present invention can adsorb small molecular organic matter after decomposition and part of the residual chlorine that has not been digested, protect the membrane components and ion exchange resins of the desalted water system, reduce the use of the desalted water pretreatment reducing agent, and reduce the operating cost.

Description

Technical Field

[0001] The invention belongs to the field of desalted water treatment, and in particular relates to a coupling device for removing organic matter and residual chlorine by multi-spectral ultraviolet rays. Background Art

[0002] With the improvement of industrial level and the increase of environmental protection requirements, there are more and more projects for recycling various types of wastewater to produce desalted water. The content of organic matter in various types of wastewater is also generally high. It is necessary to effectively remove the organic matter in the wastewater before desalination. At present, most of the treatment processes for removing organic matter are oxidation and biological methods. The oxidation method is to add excessive oxidants to the pretreatment system of desalted water, and then reduce the excess oxidants to protect membrane components and ion exchange resins. This method uses a large amount of reagents and is costly. Since membrane components and ion exchange resins are easily oxidized by residual chlorine, the oxidation process has a great safety hazard. If the reducing agent is not added in time, it will cause oxidation of membrane components and ion exchange resins.

[0003] Another method is biological method, which degrades organic matter in wastewater through biological aerobic oxidation to form carbon dioxide and nitrogen for discharge. However, after the decomposition of organic matter, a small amount of large molecular soluble organic matter such as polysaccharides and proteins will remain. These soluble organic matter can easily foul membrane components and ion exchange resins. Ion exchange resins are made of organic polymers and have strong molecular attraction with organic matter. Therefore, organic matter in the incoming water can easily foul ion exchange resins, especially ion exchange resins in continuous electro-deionization devices. Due to their unique structure, ion exchange resins cannot be replaced, which will lead to the scrapping of continuous electro-deionization devices and cause significant economic losses. Summary of the invention

[0004] In order to overcome the problems in the prior art, the purpose of the present invention is to provide a coupling device for removing organic matter and residual chlorine by multi-spectral ultraviolet rays. The system can effectively remove trace organic matter in water, and at the same time can also digest residual chlorine, reduce fouling of membrane components, extend the operation cycle of the membrane system, and reduce the consumption of reagents and reduce operating costs.

[0005] To achieve the above object, the present invention adopts the following technical solution:

[0006] A coupling device for removing organic matter and residual chlorine by multi-spectral ultraviolet rays, characterized in that it comprises a cylinder; a water inlet is arranged at one end of the cylinder, a water production port is arranged at the bottom, and a water inlet guide plate, an irradiation zone guide plate, an adsorption zone water inlet guide plate and a water production guide zone are arranged in the cylinder;

[0007] An irradiation zone is formed between the water inlet guide plate and the irradiation zone guide plate, and a number of ultraviolet irradiation lamps are installed in the irradiation zone. An adsorption zone is formed between the adsorption zone water inlet guide plate and the inner wall of the cylinder. A connecting plate for connecting the irradiation zone and the adsorption zone is arranged between the irradiation zone guide plate and the adsorption zone water inlet guide plate. The adsorption zone is connected to the water production guide zone, and the water production guide zone is connected to the water production port.

[0008] Furthermore, a control cabinet is installed on the top of the cylinder, and the ultraviolet irradiation lamp is connected to the control cabinet.

[0009] Furthermore, the ultraviolet irradiation power of the ultraviolet irradiation lamp is calculated by the following formula:

[0010] TN=Ψ(P×(Q÷v*10000)) / (3600×1000)

[0011] P-UV design dose;

[0012] Q-design water volume;

[0013] v-design flow rate;

[0014] Ψ-effective coefficient;

[0015] TN-UV irradiation power.

[0016] Furthermore, an ultrasonic cleaning device is arranged on the outer wall of the cylinder.

[0017] Furthermore, the adsorption zone is equipped with a horizontally arranged activated carbon adsorption column.

[0018] Furthermore, the activated carbon adsorption column is arranged on an activated carbon adsorption column support tube.

[0019] Furthermore, the cylinder, the ultraviolet irradiation lamp and the activated carbon adsorption column can all withstand a pressure of 1.60-2.5MPa.

[0020] Furthermore, a quartz sleeve is installed outside the ultraviolet irradiation lamp.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The present invention provides an ultraviolet irradiation lamp for ultraviolet irradiation and provides an activated carbon adsorption area for activated carbon adsorption, thereby removing residual organic matter and residual chlorine in the desalted water system, reducing fouling of the membrane by organic matter, extending the service life, reducing maintenance costs, and protecting subsequent membrane components and ion exchange resins.

[0023] Furthermore, a quartz lamp tube is provided as a protective cover on the outside of the ultraviolet irradiation lamp. The quartz lamp tube can be made into normal pressure and medium pressure according to the process requirements. After the quartz lamp tube has been used for a period of time, pollutants such as organic matter and particulate matter will adhere to the surface of the lamp tube, affecting the penetration of ultraviolet light. For this reason, the present invention provides an ultrasonic cleaning device to perform regular ultrasonic cleaning on the ultraviolet irradiation lamp. The tiny bubbles generated by the ultrasonic transducer flush the adhesions around the lamp tube. The flushed adhesions enter the rear activated carbon for adsorption, thereby extending the service life of the quartz lamp tube, reducing the number of chemical cleaning times of the quartz lamp tube, and reducing maintenance costs.

[0024] Furthermore, since the microorganisms or organic matter decomposed by ultraviolet rays will form small molecule proteins, etc., such small molecules are easily enriched on the membrane surface or ion exchange resin, affecting the desalination system. Most of these small molecules are non-polar molecules. Since activated carbon is also a non-polar substance, it is easy for activated carbon to adsorb these small molecules. Therefore, the present invention can adsorb small molecules and residual chlorine in water well by providing an activated carbon adsorption column, and the activated carbon adsorption column in the present invention can be directly filtered without rinsing before use. The activated carbon in the activated carbon adsorption column is a good oxidant adsorbent, which can adsorb a small amount of residual hypochlorous acid or hypochlorite. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a structural diagram of a coupling device for removing organic matter and residual chlorine using multi-spectral ultraviolet rays of the present invention.

[0026] In the figure, 1-water inlet, 2-water inlet guide plate, 3-ultraviolet irradiation lamp, 4-quartz sleeve, 5-ultrasonic cleaning device, 6-irradiation area water outlet guide plate, 7-connecting plate, 8-adsorption area water inlet guide plate, 9-activated carbon adsorption column, 10-activated carbon adsorption column support tube, 11-water production diversion area, 12-water production port, 13-control cabinet, 14-cylinder. DETAILED DESCRIPTION

[0027] The system is described in further detail below with reference to the accompanying drawings.

[0028] Since the desalted water system has a complete pretreatment system, it can remove most of the organic matter. However, the concentration of organic matter entering the membrane component is generally less than 50 mg / L, and the residual chlorine is generally less than 0.5 mg / L, and the content is relatively low. A coupling device is developed to remove this trace amount of organic matter and residual chlorine.

[0029] Since the membrane assembly (reverse osmosis and continuous electro-deionization membrane) has an ultrafiltration or precision filter in the pre-treatment stage, the filtration accuracy is less than 0.5μm, and the particle size of particles that are easily penetrated by ultraviolet rays is less than 10μm. Therefore, the water in the membrane device is suitable for ultraviolet irradiation treatment. Among them, the short-wave band (UVC) of the ultraviolet irradiation lamp with a wavelength of 240-280nm can be absorbed by organic matter, causing the breakage of large molecules or directly decomposing them into small molecules. In addition, UVC can also destroy or change microbial nucleic acids and proteins, causing the destruction of nucleic acid structure, affecting cell division, and preventing cells from growing, thereby achieving the purpose of removing microorganisms. Therefore, short-wave ultraviolet rays (UVC) with a wavelength of 240-280nm can be used to decompose organisms to form smaller molecular organic matter, which is then adsorbed by activated carbon.

[0030] Membrane components and ion exchange resins are made of high molecular weight organic matter and cannot tolerate oxidizing substances. Therefore, the pretreatment of desalted water requires the digestion of residual oxidants such as hypochlorous acid or hypochlorite. According to domestic and foreign research, ultraviolet rays can decompose residual chlorine very well, and the chemical reaction equation is as follows:

[0031] 2HOCl+2hv→O 2 +2HCl

[0032] 2OCl - +2hv→O 2 +2Cl -

[0033] Visible ultraviolet rays can decompose residual chlorine to produce hydrochloric acid and chlorine ions. In addition, according to domestic and foreign research, the 280-330nm medium-wave band (UVB) can decompose residual chlorine by 100%. The residual chlorine in the water after oxidation by the pretreatment system of desalted water is mainly HClO and ClO. － , and is generally less than 0.5 mg / L, with a relatively low content. Therefore, the present invention can select medium-band ultraviolet rays of 280-330 nm to decompose the residual chlorine and protect subsequent membrane components and ion exchange resins.

[0034] See also Figure 1 The coupling device for removing organic matter and residual chlorine by multi-spectral ultraviolet light of the present invention mainly comprises a cylinder 14, a water inlet 1, a water inlet guide plate 2, an ultraviolet irradiation lamp 3, a quartz sleeve 4, an ultrasonic cleaning device 5, an irradiation area water outlet guide plate 6, a connecting plate 7, an adsorption area water inlet guide plate 8, an activated carbon adsorption column 9, an activated carbon adsorption column support tube 10, a water production guide area 11, a water production port 12 and a control cabinet 13.

[0035] Among them, a water inlet 1 is provided at one end of the cylinder 14, and a water production port 12 is provided at the bottom. A water inlet guide plate 2, an irradiation area, an irradiation area guide plate 6, a connecting plate 7, an adsorption area, an adsorption area water inlet guide plate 8, and a water production guide area 11 are provided in the cylinder 14. An irradiation area is formed between the water inlet guide plate 2 and the irradiation area guide plate 6. A plurality of ultraviolet irradiation lamps 3 are installed in the irradiation area. The ultraviolet irradiation lamps 3 are vertically installed in the irradiation area. An adsorption area is formed between the adsorption area water inlet guide plate 8 and the inner wall of the cylinder 14. A connecting plate 7 for connecting the irradiation area and the adsorption area is provided between the irradiation area guide plate 6 and the adsorption area water inlet guide plate 8. The adsorption area is connected to the water production guide area 11, and the water production guide area 11 is connected to the water production port 12.

[0036] The control cabinet 13 is directly installed on the upper part of the cylinder 14 of the coupling device. The ultrasonic cleaning device 5 is symmetrically installed on the horizontal left and right outer walls of the cylinder 14. The activated carbon adsorption column 9 is installed horizontally and can be quickly replaced from the right end of the coupling device.

[0037] The pretreated water produced by the membrane system is connected to the water inlet 1. After entering the cylinder 14 through the water inlet 1, the pretreated water produced by the membrane system is evenly distributed by the water inlet guide plate 2, and then enters the irradiation area where the ultraviolet irradiation lamp 3 is located. After ultraviolet irradiation, the decomposed organic matter enters the irradiation area guide plate 6, and then enters the adsorption area through the adsorption area water inlet guide plate 8. The irradiation area guide plate 6 and the adsorption area water inlet guide plate 8 are connected by a connecting plate 7. An activated carbon adsorption column 9 is installed in the adsorption area, and the activated carbon adsorption column 9 is fixed on the activated carbon adsorption column support tube 10. Under the action of water flow pressure, water enters the activated carbon adsorption column 9 from the outside, and molecular organic matter and residual chlorine in the incoming water are adsorbed in the activated carbon adsorption column 9. The clean water after adsorption flows into the water production diversion area 11 from the inner hole of the activated carbon adsorption column 9. The water production diversion area 11 is connected to the water production port 12, and finally flows out from the water production port 12. The control cabinet 13 automatically adjusts according to the change of the water inlet flow rate of the water inlet 1 to select the number of ultraviolet irradiation lamps 3.

[0038] The coupling device of the present invention can be designed to normal pressure or medium pressure (1.6-2.5Mpa) according to user needs. In particular, the ultraviolet irradiation lamp 3, the cylinder 14, etc. are designed to be medium pressure, which is more conducive to the removal of organic matter by ultraviolet rays.

[0039] The wavelength of ultraviolet light emitted by the ultraviolet lamp 3 is 240-330nm, the first half is a short wave band, and the second half is a medium wave band, which removes organic matter and residual chlorine respectively. A quartz sleeve 4 is installed outside the ultraviolet lamp 3 to protect the ultraviolet lamp 3, and the quartz sleeve can withstand a pressure of 2.5MPa. At the same time, the quartz sleeve 4 can at least pass 90% of UVC with a wavelength of 253nm to reduce the loss of ultraviolet light when penetrating the quartz sleeve 4. An ultrasonic cleaning device 5 is arranged on the outer wall of the cylinder 14, which can make water generate tiny bubbles, and use the tiny bubbles to flush and clean the quartz sleeve 4.

[0040] Multi-spectrum ultraviolet rays (short-wave UVC and medium-wave UVB) are selected in the ultraviolet irradiation lamp. The short-wave band removes organic matter, and the medium-wave band eliminates residual chlorine.

[0041] The ultraviolet irradiation lamps 3 include working lamps and standby lamps, which can work individually or in parallel. Specifically, the number of working ultraviolet irradiation lamps 3 can be selected according to the size of the water inlet flow rate.

[0042] The ultraviolet irradiation power TN of the ultraviolet irradiation lamp 3 is calculated by the following formula:

[0043]

[0044] P-UV design dose, mj / cm 2 ;

[0045] Q-design water volume, m 3 / s;

[0046] v-design flow rate (flow rate of the water flow section of the equipment), m / s;

[0047] Ψ-effective coefficient;

[0048] TN-ultraviolet radiation power, W;

[0049] In the present invention, the UV design dose P is preferably 160-300 mj / cm 2 , which can effectively remove organic matter and residual chlorine in the incoming water.

[0050] In order to further remove small molecules after irradiation by the ultraviolet lamp, an activated carbon adsorption column is set at the rear end of the coupling device to further adsorb and remove small molecules.

[0051] The activated carbon uses finished activated carbon filter columns, which do not require cleaning and can be used directly after installation, eliminating the need for cleaning steps.

[0052] Furthermore, according to the requirements of the desalted water process, the cylinder 14 of the coupling device can be designed to be at normal pressure or medium pressure.

[0053] The control cabinet 13 can control the coupling device alone or in conjunction with the desalted water system. The control cabinet 13 is equipped with a built-in PLC control unit, which is connected to the ultraviolet irradiation lamp 3. According to the test data, the ultraviolet design dose P can be preset on the control cabinet PLC first. After the ultraviolet irradiation power TN value is automatically calculated by the built-in PLC of the control cabinet 13, the number of ultraviolet irradiation lamps to be turned on can be automatically selected. Since the power of each ultraviolet irradiation lamp 3 is customized, the irradiation power of the ultraviolet irradiation lamp 3 can be made close to the theoretically calculated ultraviolet irradiation power TN by turning on the number of ultraviolet irradiation lamps 3. The ultraviolet design dose P is determined based on the test of the operator. According to the test results, the ultraviolet design dose is preset in the control cabinet 13, and the flow rate parameters of the water flow section of the equipment are also preset in the built-in PLC of the control cabinet. The control cabinet 13 can automatically calculate the irradiation power TN according to the parameters such as the water inflow of the desalted water system, and then automatically select the number of ultraviolet irradiation lamps to be turned on so that it is close to the irradiation power TN value calculated by the ultraviolet.

Claims

1. A coupling device for removing organic matter and residual chlorine by multi-spectral ultraviolet light, characterized in that: It comprises a cylinder (14); a water inlet (1) is arranged at one end of the cylinder (14), a water production port (12) is arranged at the bottom, and a water inlet guide plate (2), an irradiation zone guide plate (6), an adsorption zone water inlet guide plate (8) and a water production guide zone (11) are arranged inside the cylinder (14); An irradiation zone is formed between the water inlet guide plate (2) and the irradiation zone guide plate (6), a plurality of ultraviolet irradiation lamps (3) are installed in the irradiation zone, an activated carbon adsorption zone is formed between the adsorption zone water inlet guide plate (8) and the inner wall of the cylinder (14), a connecting plate (7) for connecting the irradiation zone and the activated carbon adsorption zone is provided between the irradiation zone guide plate (6) and the adsorption zone water inlet guide plate (8), the activated carbon adsorption zone is connected to the water production guide zone (11), and the water production guide zone (11) is connected to the water production port (12); The activated carbon adsorption area is equipped with a horizontally arranged activated carbon adsorption column (9); The ultraviolet irradiation power of the ultraviolet irradiation lamp (3) is calculated by the following formula: TN=Ψ (P×(Q÷v*10000)) / (3600×1000) P-UV design dose; Q-design water volume; v-design flow rate; Ψ-effective coefficient; TN-ultraviolet radiation power; The ultraviolet light emitted by the ultraviolet lamp (3) has a wavelength of 240-330 nm; The coupling device is used to treat pre-treated water produced by a membrane system in a desalted water system, wherein the organic matter concentration is less than 50 mg / L and the residual chlorine is less than 0.5 mg / L.

2. A coupling device for removing organic matter and residual chlorine by multi-spectral ultraviolet light according to claim 1, characterized in that: A control cabinet (13) is installed on the top of the cylinder (14), and the ultraviolet irradiation lamp (3) is connected to the control cabinet (13); the control cabinet (13) can control the coupling device alone or in a chain control with the desalted water system.

3. A coupling device for removing organic matter and residual chlorine by multi-spectral ultraviolet light according to claim 1, characterized in that: An ultrasonic cleaning device (5) is provided on the outer wall of the cylinder (14).

4. A coupling device for removing organic matter and residual chlorine by multi-spectral ultraviolet light according to claim 1, characterized in that: The activated carbon adsorption column (9) is arranged on an activated carbon adsorption column support tube (10).

5. The multi-spectral ultraviolet coupling device for removing organic matter and residual chlorine according to claim 1 is characterized in that: The cylinder (14) and the ultraviolet irradiation lamp (3) can withstand normal pressure or a pressure of 1.6-2.5 MPa.

6. The multi-spectral ultraviolet coupling device for removing organic matter and residual chlorine according to claim 1 is characterized in that: A quartz sleeve (4) is installed outside the ultraviolet irradiation lamp (3).

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