Activated carbon adsorption synergistic advanced oxidation device

Abstract

The utility model discloses an activated carbon adsorption synergistic advanced oxidation device, which belongs to the field of sewage treatment and comprises a wastewater containing device, a wastewater sampling component, an ozone generator, a mixed reaction tank, a micro-channel reactor, an ultraviolet generator, an activated carbon adsorption reactor and a control system. The wastewater sampling assembly comprises a first sampling pump and a first water inlet pipe, the water inlet end of the first water inlet pipe is connected with the wastewater containing device, the water outlet end of the first water inlet pipe is connected with the mixed reaction tank, and the first sampling pump is arranged on the first water inlet pipe. In the application, incompletely oxidized organic matters after ozone oxidation and tiny flocs generated in the oxidation process are adsorbed by the activated carbon, so that the content of organic pollutants in water is further reduced. According to the invention, ultraviolet, ozone and micro-channel technologies are used for synergism, and activated carbon adsorption is used for assistance; experimental results show that the high-concentration degradation-resistant organic wastewater can be treated and utilized more economically, efficiently and safely.

Description

Technical Field

[0001] The utility model relates to the field of sewage treatment, specifically to an activated carbon adsorption synergistic advanced oxidation device. More specifically, the application provides an ozone, microchannel, ultraviolet and activated carbon adsorption synergistic advanced oxidation method and device, which can greatly simplify the difficult-to-degrade organic matter treatment equipment, improve the treatment efficiency, and has extremely high application value and good application prospects. Background Art

[0002] This type of organic wastewater is difficult to be degraded by microorganisms. If discharged directly, it will gradually accumulate in the environment and remain for a long time. It will not only cause serious pollution to the surrounding ecological environment, but also threaten the health and safety of humans and animals, and cause serious environmental pollution.

[0003] At present, common sewage treatment methods are mainly divided into physical methods, biological methods and chemical methods. At present, the treatment of difficult-to-degrade organic sewage is mainly based on biochemical treatment. Chinese patent application CN201811414065.5 discloses a method for treating sewage by combined advanced oxidation; in response to this patent application, Chinese patent application CN202211127907.5 believes that: although the invention uses ultraviolet light plus an oxidant for catalytic oxidation, the efficiency is not ideal in the sewage catalytic oxidation process, which greatly increases the sewage treatment time, thereby increasing the sewage treatment cost, and the energy-saving effect is not ideal, and it is impossible to use thermal energy to regenerate the activated carbon.

[0004] At the same time, some difficult-to-degrade organic wastewater has the characteristics of high toxicity, complex composition, and difficulty in biodegradation. Simple biochemical treatment can hardly meet the treatment needs of difficult-to-degrade organic wastewater and cannot achieve the level of standard discharge or reuse.

[0005] Therefore, there is an urgent need for a new method and / or device with a simple structure that can meet the needs of difficult-to-degrade organic wastewater. Utility Model Content

[0006] The utility model aims to provide an activated carbon adsorption synergistic advanced oxidation device to meet the treatment needs of difficult-to-degrade organic wastewater.

[0007] In order to achieve the above purpose, this application adopts the following technical solutions:

[0008] An activated carbon adsorption synergistic advanced oxidation device, comprising a wastewater sampling assembly connected to the wastewater to be treated, an ozone generator, a mixing reaction tank, a microchannel reactor, an ultraviolet generator, and an activated carbon adsorption reactor;

[0009] The wastewater sampling assembly is connected to the mixing reaction tank and the wastewater in the wastewater sampling assembly can enter the mixing reaction tank, the ozone generator is connected to the mixing reaction tank and the ozone generated by the ozone generator can be mixed with the wastewater in the mixing reaction tank to obtain a first mixed liquid;

[0010] The mixed reaction tank is connected to the inlet end of the microchannel reactor and the first mixed liquid in the mixed reaction tank can enter the microchannel reactor for reaction. The ultraviolet generator is arranged outside the microchannel reactor and the ultraviolet generator can irradiate the reaction channel in the microchannel reactor with ultraviolet light to promote the reaction in the reaction channel in the microchannel reactor.

[0011] The outlet end of the microchannel reactor is connected to the activated carbon adsorption reactor and the wastewater treated by the microchannel reactor can enter the activated carbon adsorption reactor for treatment;

[0012] Activated carbon is arranged in the activated carbon adsorption reactor, and the activated carbon in the activated carbon adsorption reactor can adsorb flocculants in the wastewater to reduce the concentration of organic pollutants in the wastewater.

[0013] The ultraviolet light generated by the ultraviolet light generator has a wavelength of 254 nanometers or 180 nanometers.

[0014] It also includes a control system, and the ozone generator and the ultraviolet generator are respectively connected to the control system.

[0015] It also includes a wastewater holding device for holding wastewater to be treated, and the wastewater sampling assembly is connected to the wastewater holding device.

[0016] The wastewater sampling assembly includes a first sampling pump and a first water inlet pipe. The water inlet end of the first water inlet pipe is connected to the wastewater holding device, the water outlet end of the first water inlet pipe is connected to the mixing reaction tank, and the wastewater in the wastewater holding device can be sent into the mixing reaction tank through the first water inlet pipe. The first sampling pump is arranged on the first water inlet pipe.

[0017] The first injection pump is connected to a control system.

[0018] The specific surface area of ​​the activated carbon is 850-1100m 2 / g.

[0019] It also includes a discharge device, which is connected to the activated carbon adsorption reactor and through which the wastewater treated by the activated carbon adsorption reactor can be discharged.

[0020] In response to the aforementioned problems, the present application provides an activated carbon adsorption synergistic advanced oxidation device, which includes a wastewater sampling component, an ozone generator, a mixing reaction tank, a microchannel reactor, an ultraviolet generator, and an activated carbon adsorption reactor.

[0021] With this device, the wastewater to be treated enters the mixed reaction tank through the wastewater sampling assembly; at the same time, the ozone generated by the ozone generator is evenly mixed with the wastewater in the mixed reaction tank to obtain a first mixed liquid. Then, the first mixed liquid enters the microchannel reactor for reaction. The ultraviolet rays generated by the ultraviolet generator irradiate the reaction channel in the microchannel reactor; in the reaction channel, the ozone is catalyzed by the ultraviolet radiation to generate hydroxyl radicals and decompose water molecules into •H and •OH radicals; at the same time, the micrometer-scale liquid circulation (microacoustic flow) caused by the radiation torsion of the cavitation bubble forms a high-speed gradient and viscous stress on the bubble surface, causing the carbon bonds on the main chain of the macromolecule to break, promoting the decomposition of difficult-to-degrade organic matter. Finally, the incompletely oxidized organic matter treated by the microchannel reactor enters the activated carbon adsorption reactor for reaction. In the activated carbon adsorption reactor, the activated carbon acts as an adsorbent and a catalyst; on the one hand, the activated carbon can adsorb the tiny floccules generated in the oxidation process; on the other hand, the activated carbon can act as a catalyst to promote the further degradation of organic matter.

[0022] Furthermore, in the present application, an external field is used to strengthen the micro-reaction. With this device, ultraviolet rays are applied externally to achieve catalytic oxidation in the channel to generate hydroxyl radicals; the first mixed liquid is a mixture of wastewater and ozone, which contains a large number of free radicals. Through the combination of the microchannel reactor and the ultraviolet generator, micron-scale cutting of the liquid flowing through is achieved, which greatly improves the efficiency of mass transfer and heat transfer, and ensures that the free radicals generated by ozone and ultraviolet rays are fully mixed with the liquid.

[0023] Due to the characteristics of the microchannel reactor, the contact probability between the hydroxyl radicals generated in the reactor and the organic molecules is increased, which effectively improves the utilization efficiency of the generated hydroxyl radicals, thereby greatly improving the oxidation efficiency. In this application, there are two main types of reactants produced by the decomposition of ozone in water: one is O generated by the reaction of OH- in water with ozone; 2- and HO2; the second is the free radicals (including O 3- , HO 3- , •OH, etc.). Under the action of ultraviolet rays, the ozone decomposition products are fully mixed with the liquid and react quickly, further improving the mineralization and oxidation efficiency and scope of application of organic matter. Specifically, when the present application uses ultraviolet rays with a wavelength of 254 nanometers or 180 nanometers to irradiate the liquid, ozone is catalyzed by ultraviolet radiation to form a variety of free radicals, and decomposes H2O molecules (the OH bond energy in water molecules is 500kJ / mol) into •H and •OH free radicals. In addition, the micrometer-scale liquid circulation (microacoustic flow) caused by the radiation torsion of the cavitation bubble forms a high-velocity gradient and viscous stress on the bubble surface, causing the carbon bonds on the main chain of the macromolecule to break, thereby achieving the decomposition of difficult-to-degrade organic matter.

[0024] In this application, the incompletely oxidized organic matter after ozone oxidation and the tiny flocs produced during the oxidation process enter the activated carbon adsorption reactor and are adsorbed by the activated carbon, further reducing the content of organic pollutants in the water. Activated carbon is a very fine carbon particle with a large surface area, and there are a large number of tiny micropores - capillaries in the carbon particles. The capillaries in the activated carbon have a strong adsorption capacity; at the same time, due to the large specific surface area of ​​the carbon particles, they can fully contact with the difficult-to-degrade organic pollutants. When these difficult-to-degrade organic pollutants are adsorbed, the purification effect can be further improved.

[0025] In summary, this application adopts the synergistic effect of ultraviolet light, ozone, and microchannel technology, supplemented by activated carbon adsorption; experimental results show that this application can achieve more economical, efficient, and safe treatment and utilization of high-concentration difficult-to-degrade organic wastewater. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the structure of the advanced oxidation device in Example 1.

[0027] Markings in the figure: 1. Ozone generator, 2. Mixing reaction tank, 3. Microchannel reactor, 4. Ultraviolet generator, 5. Activated carbon adsorption reactor. DETAILED DESCRIPTION

[0028] The utility model is described in detail below in conjunction with the accompanying drawings.

[0029] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0030] The activated carbon adsorption and advanced oxidation device of this embodiment includes a wastewater holding device for holding wastewater to be treated, a wastewater sampling assembly, an ozone generator, a mixing reaction tank, a microchannel reactor, an ultraviolet generator, an activated carbon adsorption reactor, and a control system. Among them, the wastewater sampling assembly includes a first sampling pump and a first water inlet pipe, the water inlet end of the first water inlet pipe is connected to the wastewater holding device, the water outlet end of the first water inlet pipe is connected to the mixing reaction tank, and the first sampling pump is arranged on the first water inlet pipe. At the same time, the ozone generator is connected to the mixing reaction tank, and the ozone generated by the ozone generator can be mixed with the wastewater in the mixing reaction tank to obtain a first mixed liquid.

[0031] In the present application, the mixing reaction tank is connected to the inlet end of the microchannel reactor; the ultraviolet generator is arranged outside the microchannel reactor, and the ultraviolet generator can irradiate the reaction channel in the microchannel reactor with ultraviolet light to promote the reaction in the reaction channel in the microchannel reactor. The outlet end of the microchannel reactor is connected to the activated carbon adsorption reactor, and the wastewater treated by the microchannel reactor can enter the activated carbon adsorption reactor for treatment. Activated carbon is arranged in the activated carbon adsorption reactor, and the specific surface area of ​​the activated carbon is preferably 850-1100m 2 In the present application, the first sample pump, the ozone generator, and the ultraviolet generator are respectively connected to the control system. The wavelength of the ultraviolet light generated by the ultraviolet generator is preferably 254 nanometers or 180 nanometers.

[0032] When the device is working, the wastewater to be treated first enters the wastewater holding device for homogenization and equalization treatment; then, the wastewater in the wastewater holding device is sent to the mixed reaction tank through the first water inlet pipe; the ozone generated in the ozone generator is sent to the mixed reaction tank and mixed with the wastewater therein to obtain a first mixed liquid, which is sent to the microchannel reactor; in the microchannel reactor, the ultraviolet generator irradiates the reaction channel in the microchannel reactor with ultraviolet light to promote the reaction in the reaction channel in the microchannel reactor and greatly improve the reaction efficiency. Finally, the wastewater treated by the microchannel reactor enters the activated carbon adsorption reactor for adsorption and catalytic treatment to reduce the concentration of organic pollutants in the wastewater.

[0033] Furthermore, the present application also includes a discharge device, which is connected to the activated carbon adsorption reactor, and the wastewater treated by the activated carbon adsorption reactor can be discharged through the discharge device.

[0034] Example 1

[0035] The wastewater of a chemical production enterprise (mainly producing polybutadiene rubber, phenol, acetone, acrylonitrile and styrene series of high molecular synthetic plastics) contains CODcr and some organic pollutants such as phenol, benzene and peroxide. The average CODcr concentration of the wastewater is 1562mg / L. The above-mentioned device is used to treat the wastewater; the wavelength of ultraviolet light is 254 nanometers, and the specific surface area of ​​activated carbon is 900m 2 / g.

[0036] It was determined that the CODcr concentration of the effluent from the microchannel reactor was 327 mg / L, with a removal rate of 79.1%; the CODcr concentration of the effluent from the rear end of the activated carbon adsorption reactor was 181 mg / L, with a CODcr removal rate of 88.4%.

[0037] Example 2

[0038] The wastewater produced by a rubber crosslinking agent contains pollutants such as CODcr, volatile phenols, and ammonia nitrogen. The average CODcr concentration of the wastewater is 2673 mg / L. The wastewater is treated with the above-mentioned device; the wavelength of ultraviolet light is 254 nanometers, and the specific surface area of ​​activated carbon is 1050 m 2 / g.

[0039] It was determined that the CODcr concentration of the effluent from the microchannel reactor was 627 mg / L, with a removal rate of 76.5%; the CODcr concentration of the effluent from the rear end of the activated carbon adsorption reactor was 295 mg / L, with a CODcr removal rate of 89%.

[0040] Example 3

[0041] The wastewater produced by a high-sulfur pharmaceutical intermediate contains a large amount of high-concentration sulfur salts and organic sulfur compounds. The average CODcr concentration of the wastewater is 92190 mg / L. The wastewater is treated with the above-mentioned device; the wavelength of ultraviolet light is 254 nanometers, and the specific surface area of ​​activated carbon is 980m 2 / g.

[0042] It has been determined that the CODcr concentration of the effluent from the rear end of the activated carbon adsorption reactor is 38,800 mg / L, and the CODcr removal rate is 58%. The subsequent effluent enters the biochemical treatment system.

[0043] This type of wastewater is difficult to degrade using conventional biochemical reactions, and the degradation rate is usually only about 20-30%. Using this device, the COD degradation rate can reach about 58%. After that, using a biochemical treatment system will greatly improve its biodegradability.

[0044] Example 4

[0045] The ammonia wastewater from a coal coking enterprise contains pollutants such as CODcr, ammonia nitrogen, total nitrogen, and alkalinity. The CODcr concentration of the wastewater is 2080~3000 mg / L. The wastewater is treated with the above-mentioned device; the wavelength of the ultraviolet light is 180 nanometers, and the specific surface area of ​​the activated carbon is 900m 2 / g.

[0046] It has been determined that the CODcr concentration of the effluent from the rear end of the activated carbon adsorption reactor is less than 150 mg / L, meeting the indirect emission standard (quenching water) of the "Pollutant Emission Standard for Coking Chemical Industry" (GB16171-2012), that is, CODcr ≤150 mg / L.

[0047] Example 5

[0048] The wastewater from a coal-to-gas methanol plant contains pollutants such as CODcr, BOD5, ammonia nitrogen, total nitrogen, and oil. After the wastewater is treated by front-end biochemical treatment, the CODcr concentration entering this device is 429 mg / L. The wastewater is treated by the above-mentioned device; the wavelength of ultraviolet light is 180 nanometers, and the specific surface area of ​​activated carbon is 950m 2 / g.

[0049] It was determined that the CODcr concentration of the effluent from the rear end of the activated carbon adsorption reactor was 45 mg / L, and the CODcr removal rate reached 89.5%.

[0050] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An activated carbon adsorption synergistic advanced oxidation device, characterized in that: It includes a wastewater sampling assembly connected to the wastewater to be treated, an ozone generator, a mixing reaction tank, a microchannel reactor, an ultraviolet generator, and an activated carbon adsorption reactor; The wastewater sampling assembly is connected to the mixing reaction tank and the wastewater in the wastewater sampling assembly can enter the mixing reaction tank, the ozone generator is connected to the mixing reaction tank and the ozone generated by the ozone generator can be mixed with the wastewater in the mixing reaction tank to obtain a first mixed liquid; The mixed reaction tank is connected to the inlet end of the microchannel reactor and the first mixed liquid in the mixed reaction tank can enter the microchannel reactor for reaction. The ultraviolet generator is arranged outside the microchannel reactor and the ultraviolet generator can irradiate the reaction channel in the microchannel reactor with ultraviolet light to promote the reaction in the reaction channel in the microchannel reactor. The outlet end of the microchannel reactor is connected to the activated carbon adsorption reactor and the wastewater treated by the microchannel reactor can enter the activated carbon adsorption reactor for treatment; Activated carbon is arranged in the activated carbon adsorption reactor, and the activated carbon in the activated carbon adsorption reactor can adsorb flocculants in the wastewater to reduce the concentration of organic pollutants in the wastewater.

2. The activated carbon adsorption synergistic advanced oxidation device according to claim 1, characterized in that: The ultraviolet light generated by the ultraviolet light generator has a wavelength of 254 nanometers or 180 nanometers.

3. The activated carbon adsorption synergistic advanced oxidation device according to claim 1 or 2, characterized in that: It also includes a control system, and the ozone generator and the ultraviolet generator are respectively connected to the control system.

4. The activated carbon adsorption synergistic advanced oxidation device according to claim 1 or 2, characterized in that: It also includes a wastewater holding device for holding wastewater to be treated, and the wastewater sampling assembly is connected to the wastewater holding device.

5. The activated carbon adsorption synergistic advanced oxidation device according to claim 4, characterized in that: The wastewater sampling assembly includes a first sampling pump and a first water inlet pipe. The water inlet end of the first water inlet pipe is connected to the wastewater holding device, the water outlet end of the first water inlet pipe is connected to the mixing reaction tank, and the wastewater in the wastewater holding device can be sent into the mixing reaction tank through the first water inlet pipe. The first sampling pump is arranged on the first water inlet pipe.

6. The activated carbon adsorption synergistic advanced oxidation device according to claim 5, characterized in that: The first injection pump is connected to a control system.

7. The activated carbon adsorption synergistic advanced oxidation device according to claim 1, characterized in that: The specific surface area of ​​the activated carbon is 850-1100m 2 / g.

8. The activated carbon adsorption synergistic advanced oxidation device according to claim 1, characterized in that: It also includes a discharge device, which is connected to the activated carbon adsorption reactor and through which the wastewater treated by the activated carbon adsorption reactor can be discharged.

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