Novel advanced oxidation device

Abstract

The utility model discloses a novel advanced oxidation device which comprises an outer shell, a gas-liquid mixing chamber, an ultrasonic atomization disc, a gas inlet hole, a water inlet hole, a connecting ozone generator, a UV reaction coil pipe and the like. Through ultrasonic wave catalysis and ultraviolet light catalysis, H2O is excited by O3 and a large amount of. OH with higher oxidability is generated, the mixing degree and turbulent fluctuation intensity of ozone and sewage are improved, the mass transfer coefficient is increased, the mass transfer rate of ozone is increased, and four-section oxidation reaction is carried out in one reactor, so that the ozone oxidation efficiency and effect are greatly improved; and a reinforced oxidation effect is generated on pollutants in the wastewater, so that the pollutants in the wastewater are degraded and removed.

Description

Technical Field

[0001] The invention relates to the technical field of advanced oxidation, in particular to a novel advanced oxidation device. Background Art

[0002] In the 1950s, ozone oxidation began to be used in urban sewage and industrial wastewater treatment. Its technical advantages are: 1. Strong oxidation ability, significant effects on deodorization, decolorization, sterilization, removal of organic and inorganic matter, and rapid mineralization of organic matter in a short time; 2. Ozone oxidation reaction completely degrades organic matter into carbon dioxide and water, without secondary pollution. The air and electricity used for ozone do not need to be stored and transported, and operation and maintenance are relatively simple.

[0003] The energy consumption of the ozone generator of the single ozone oxidation method is large, the oxidation strength of O3 is weaker than that of OH, the gas and liquid are difficult to mix in the water body, the reaction time is long and excessive dosage is usually added, resulting in high treatment costs. In addition, its ozone oxidation reaction is selective and has a relatively poor oxidation effect on certain halogenated hydrocarbons and pesticides. Summary of the invention

[0004] The problem to be solved by the present invention is to propose an innovative process scheme to convert a large amount of O3 into more efficient ·OH in view of the shortcomings of the above-mentioned prior art, with a shorter process time and better oxidation effect; no other chemical agents or catalysts need to be added separately, reducing secondary pollution and operation and maintenance difficulties. The present invention combines ozone oxidation, ultrasonic oxidation and ultraviolet / ozone oxidation processes, so that the O3 introduced into the reactor is excited by ultrasound and UV, and reacts with H2O to generate a large amount of more highly oxidizing ·OH, oxidizing and degrading pollutants in the wastewater, thereby achieving the effect of removing pollutants in the wastewater.

[0005] In order to solve the above problems, the solution adopted by the present invention is as follows: a new type of advanced oxidation device, characterized in that it includes an outer shell, which has a conical structure; a gas-liquid mixing chamber is provided on the top of the outer shell, an ultrasonic atomization disk is provided in the gas-liquid mixing chamber, and a circle of annular groove is left between the ultrasonic atomization disk and the gas-liquid mixing chamber, and an air inlet and a water inlet are arranged at intervals in the annular groove, and the air inlet is connected to an ozone generator; a UV reaction coil with a spiral structure is provided in the outer shell, a connecting hole connected to the UV reaction coil is provided on the side wall of the gas-liquid mixing chamber, and a water outlet is provided at the bottom of the UV reaction coil; an air outlet is provided on the top of the outer shell, and a gas-liquid separation inclined plate is provided in the air outlet.

[0006] Furthermore, a UV light strip is provided in the UV reaction coil for emitting ultraviolet light to the mixed gas and liquid.

[0007] Furthermore, a conical hollow cavity is arranged inside the outer shell above the gas-liquid mixing chamber; and the UV reaction coil is composed of an inner wall of the outer shell, an outer wall of the hollow cavity and a spiral partition.

[0008] Furthermore, at least one vibration diaphragm of an ultrasonic atomizer is provided in the ultrasonic atomization disk.

[0009] There are two reaction pathways in the ozone catalytic oxidation process: (1) Ozone directly reacts with organic matter. It is selective and generally attacks organic matter with double bonds, and has better effects on aromatic and unsaturated aliphatic hydrocarbon organic compounds. (2) Ozone (O3) catalyzes the indirect oxidation reaction to produce intermediates such as hydroxyl radicals (·OH) with stronger oxidizing properties, which undergo relatively non-selective oxidative decomposition reactions with organic pollutants.

[0010] The sewage droplets after ultrasonic atomization appear as tiny floating particles of about 5 microns. In an environment filled with high concentration of ozone, gas and liquid mix, increasing the contact area between ozone and water, which can improve the mass transfer rate and oxidation efficiency of ozone.

[0011] The effect of ultrasound-enhanced ozone oxidation is mainly manifested in two aspects: 1. Promoting the decomposition of ozone; under the action of ultrasound, ozone decomposes and reacts with water to produce more and more active free radicals such as OH; 2. Increasing the mass transfer rate constant; on the one hand, ultrasound can transform ozone bubbles into "microbubbles", increasing the contact area between ozone and water, that is, increasing the surface area. On the other hand, after atomizing into micron-sized droplets, the mixing degree and turbulence intensity of gas and water are increased, the thickness of the liquid film is reduced, the resistance is reduced, and the mass transfer coefficient is increased, thereby increasing the mass transfer rate of ozone.

[0012] There are two main viewpoints on the synergistic mechanism of ozone and ultraviolet light. One is that ozone first decomposes into oxygen atoms under the action of ultraviolet light, and the free oxygen atoms (·O) then react with water to generate hydroxyl radicals (·OH) with higher oxidation potential; the other is that ozone first reacts with water under ultraviolet light to generate hydrogen peroxide, which further decomposes to generate hydroxyl radicals (·OH), overcoming the weak electric current of ozone (O3) with slow reaction rate and high selectivity with organic matter, thus improving the oxidation effect. The reaction mechanism is as follows:

[0013] 03+H2O+UV→H2O+O2

[0014] H2O2+UV→2·OH

[0015]

[0016] O3+H2O - →O3 - +HO2

[0017] HO2·→O2· - +H +

[0018] O3+O2 - →O3- +O2

[0019]

[0020] The technical effects of the present invention are as follows:

[0021] 1) The invention utilizes the ultrasonic cavitation effect to promote the decomposition of ozone in water. Under the action of ultrasound, ozone decomposes and reacts with water to produce more and more highly active free radicals such as OH, thereby improving the chemical oxidation performance.

[0022] 2) The present invention utilizes ultrasonic waves (US), which can transform ozone bubbles into "microbubbles" on the one hand, thereby increasing the contact area between ozone and water, that is, increasing the surface area. On the other hand, the cavitation effect of the bubble collapse produces microscopic supercritical water to generate a thermal effect, which can thermally decompose pollutants in the water to a certain extent.

[0023] 3) The present invention utilizes ultrasonic atomization combined with ultraviolet light excitation, and the atomized sewage droplets appear as micron-sized floating particles, which are suspended in the ozone environment, thereby increasing the mixing degree and turbulence intensity of ozone and water, reducing resistance, and increasing the mass transfer coefficient, thereby increasing the mass transfer rate of ozone, thereby improving the ozone oxidation effect. Ozone is first decomposed into oxygen atoms under the action of ultraviolet light, and the free oxygen atoms (·O) then react with water to generate hydroxyl radicals (·OH) with a higher oxidation potential, thereby improving the chemical oxidation performance.

[0024] 4) The present invention uses a variable diameter spiral coil reactor, so that the atomized droplets collide and coarsen continuously during the centrifugal acceleration process, and after converging, they collide with the side wall and the top inclined plate and then converge downward, and the surface contacts ozone and irradiates ultraviolet light, resulting in a secondary catalytic oxidation reaction, which has a higher utilization efficiency of ozone and ultraviolet light and is convenient for subsequent treatment of the treated water after collection; compared with the straight tube reactor, the subsequent installation of a gas-liquid separator has a better effect and occupies less space. The closer the variable diameter spiral coil reactor is to the gas outlet, the smaller the pipe diameter and the faster the flow rate, which further improves the mixing degree and turbulence intensity of ozone, hydroxyl radicals (·OH) and water, thereby improving the purification effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic diagram of the process.

[0026] Figure 2 This is a schematic diagram of the front view of a new advanced oxidation device.

[0027] Figure 3 This is a front view cross-sectional diagram of a new advanced oxidation device.

[0028] Figure 4 This is a 3D cross-sectional view of the interior of the new advanced oxidation device.

[0029] Figure 5COD removal rate under different devices.

[0030] Among them, 1. gas-liquid mixing chamber, 2. water outlet, 3. outer shell, 4. air outlet, 5. gas-liquid separation inclined plate, 6. hollow cavity, 7. UV light strip, 8. UV reaction coil, 9. connecting hole, 10. ultrasonic atomization disk, 11. water inlet, 12 air inlet, 13. ultrasonic atomizer vibrating diaphragm. DETAILED DESCRIPTION

[0031] The present invention is further described in detail below with reference to the accompanying drawings.

[0032] Example: Figure 2 , Figure 3 As shown, a novel advanced oxidation device comprises an outer shell 3, which is a conical structure; a gas-liquid mixing chamber 1 is arranged on the top of the outer shell 3, an ultrasonic atomizing disk 10 is arranged in the gas-liquid mixing chamber 1, and a circle of annular grooves is left between the ultrasonic atomizing disk 10 and the gas-liquid mixing chamber 1, and an air inlet 12 and a water inlet 11 are arranged in the annular groove, and the air inlet 12 is connected to the ozone generator; a UV reaction coil 8 with a spiral structure is arranged in the outer shell 3, a connecting hole 9 connected to the UV reaction coil 8 is arranged on the side wall of the gas-liquid mixing chamber 1, and a water outlet 2 is arranged at the bottom of the UV reaction coil 8; an air outlet 4 is arranged on the top of the outer shell 3, and a gas-liquid separation inclined plate 5 is arranged in the air outlet 4. A UV light strip 7 is arranged in the UV reaction coil 8 for radiating ultraviolet light to the mixed gas and liquid. A conical hollow cavity 6 is arranged above the gas-liquid mixing chamber 1 in the outer shell 3; the UV reaction coil 8 is composed of the inner wall of the outer shell 3, the outer wall of the hollow cavity 6 and a spiral partition. Six ultrasonic atomizer vibration diaphragms 13 are arranged inside the ultrasonic atomization disk 10 .

[0033] In the gas-liquid mixing chamber 1 at the lower end of the reactor, wastewater is introduced into the water inlet 11 arranged at intervals in an annular manner, and ozone gas is introduced into the air inlet 12, which are mixed in the annular water tank and then overflow into the middle ultrasonic atomization disk 10 (the liquid level in the disk can be controlled by the water inlet speed to ensure the atomization efficiency). The ultrasonic atomizer vibration diaphragm 13 evenly distributed in the disk vibrates at a high frequency, which can transform ozone bubbles into "microbubbles", thereby increasing the contact area between ozone and water, that is, increasing the surface area and improving the mass transfer efficiency; on the other hand, cavitation produces microscopic supercritical water, which produces a thermal effect to degrade pollutants in the water. At the same time, ultrasonic vibration can atomize the waste liquid to produce micron-sized droplets, increase the ozone contact area, and continuously introduce ozone gas to increase the air pressure in the gas-liquid mixing chamber 1, pushing the droplets from the connecting hole 9 into the UV reaction coil 7. The UV reaction coil 7 spirals upward around the closed hollow cavity 6, and the waste liquid droplets are mixed with the ozone gas in the inner cavity of the coil. The UV light strip 8 is attached to the inner cavity of the reaction coil to emit ultraviolet light to the mixed gas and liquid. Ozone first decomposes free oxygen atoms (·O) under the action of ultraviolet light, and the free oxygen atoms (·O) react with water to generate hydroxyl radicals (·OH) with higher oxidation potential, thereby improving the chemical oxidation performance. At the same time, as the inner diameter of the coil continues to shrink upward, the flow rate in the tube continues to increase, and the droplets continue to accelerate and spiral upward in the tube, gradually colliding and condensing into larger droplets, which are intercepted by the gas-liquid separation inclined plate 5 at the top, dripping into the inner cavity of the UV reaction coil 7, converging downward, and contacting with the surface of O3 while irradiating ultraviolet light, a secondary UV+O3 catalytic oxidation reaction is finally discharged from the water outlet 2, and the remaining gas bypasses the gas-liquid separation inclined plate 5 and is discharged from the gas outlet 4, completing the entire contact reaction process.

[0034] Working principle: The present invention combines ozone, ultrasonic catalysis and ultraviolet catalytic oxidation technology. The wastewater is mixed with O3 in the annular water tank of the gas-liquid mixing chamber 1 for oxidation, which is the first stage of oxidation; the waste liquid is mixed with O3 and overflows into the ultrasonic atomization disk 10 for US+O3 oxidation, which is the second stage of oxidation; the ultrasonic atomization waste liquid forms droplets and is mixed with ozone, and then irradiated with ultraviolet light in the inner cavity of the UV reaction coil 7 by the UV light strip attached to the inner cavity of the UV reaction coil, which is UV+O3 catalytic oxidation, which is the third stage of oxidation; the liquid flow that collides and converges upward flows downward in the reactor, contacts the ozone surface and is irradiated with ultraviolet light, which causes UV+O3 catalytic oxidation, which is the fourth stage of oxidation. The four-stage oxidation process combines ozone, ultrasonic catalytic oxidation, and ultraviolet catalytic oxidation technology. Without using a catalyst, the reactor structure is simplified and integrated. The ozone oxidation reaction is stimulated by ultrasound and ultraviolet light, which increases the oxidation contact area and improves the mass transfer efficiency. At the same time, a large amount of O3 is converted into OH with stronger oxidizing properties, thereby improving the efficiency and effect of ozone oxidation, reducing production and maintenance costs, and can continuously and efficiently oxidize and degrade pollutants in water.

[0035] Example 1: 3.5 liters of landfill leachate NF concentrate was treated. Based on the above technical solution, only O3 was introduced into the reactor and the operation was carried out for 180 minutes.

[0036] Example 2: To treat 3.5 liters of NF concentrate of landfill leachate, O3 was introduced into the reactor based on the above technical solution, and the ultrasonic atomizer was turned on and operated for 180 minutes.

[0037] Example 3: To treat 3.5 liters of NF concentrate of landfill leachate, O3 was introduced into the reactor based on the above technical solution, and the ultrasonic atomizer and ultraviolet lamp were turned on. The reactor structure was a straight glass tube and operated for 180 minutes.

[0038] Example 4: 3.5 liters of landfill leachate NF concentrate was treated. Based on the above technical solution, O3 was introduced into the reactor, and the ultrasonic atomizer and ultraviolet lamp were turned on. The reactor structure was the reactor described in the patent specification and operated for 180 minutes.

[0039] COD removal rate after 3 hours Example 1 21.93％ Example 2 37.67％ Example 3 53.47％ Example 4 67.32％

[0040] This is a fixed power ultrasonic generator and a fixed ozone inlet concentration and flow rate. If the process parameters are adjusted and improved according to water quality and quantity, the COD degradation efficiency can be further improved.

Claims

1. A novel advanced oxidation device, characterized in that: The invention comprises an outer shell (3) having a conical structure; a gas-liquid mixing chamber (1) is arranged at the top of the outer shell (3); an ultrasonic atomizing disk (10) is arranged in the gas-liquid mixing chamber (1); a circle of annular groove is left between the ultrasonic atomizing disk (10) and the gas-liquid mixing chamber (1); an air inlet (12) and a water inlet (11) are arranged in the annular groove at intervals; the air inlet (12) is connected to an ozone generator; a UV reaction coil (8) having a spiral structure is arranged in the outer shell (3); a connecting hole (9) communicating with the UV reaction coil (8) is arranged on the side wall of the gas-liquid mixing chamber (1); a water outlet (2) is arranged at the bottom of the UV reaction coil (8); an air outlet (4) is arranged at the top of the outer shell (3); a gas-liquid separation inclined plate (5) is arranged in the air outlet (4).

2. The novel advanced oxidation device according to claim 1, characterized in that: The UV reaction coil (8) is provided with a UV light strip (7) for emitting ultraviolet light to irradiate the mixed gas and liquid.

3. The novel advanced oxidation device according to claim 1, characterized in that: A conical hollow cavity (6) is arranged in the outer shell (3) above the gas-liquid mixing chamber (1); the UV reaction coil (8) is composed of the inner wall of the outer shell (3), the outer wall of the hollow cavity (6) and a spiral partition.

4. The novel advanced oxidation device according to claim 1, characterized in that: At least three ultrasonic atomizer vibration diaphragms (13) are arranged inside the ultrasonic atomization disk (10).

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