Oxidation system suitable for advanced purification of industrial wastewater

Abstract

The utility model discloses an oxidation system suitable for industrial wastewater advanced purification, including adjusting unit box, adjusting unit box passes through the water inlet and water, and the top is connected tail gas destroyer through the exhaust port, is connected with the circulation ozone adding pipeline through the circulating water export, circulating water import, obtains liquid alkali from liquid alkali storage tank through liquid alkali adding mouth, obtains hydrogen peroxide from hydrogen peroxide storage tank through hydrogen peroxide adding mouth, and is equipped with on -line liquid level meter collection internal liquid level height, is equipped with on -line pH meter collection internal water body's pH value, is equipped with agitator, the circulating ozone adding pipeline from circulating water export to circulating water import includes mixed liquid circulating pump, jet washer, UV reactor and pipe type heat exchanger in proper order, and jet washer includes ozone filling mouth, is connected ozone generator through ozone filling mouth, introduces ozone from ozone generator. The utility model solves the problem of low utilization rate of oxidizing agent, unstable reaction environment, multiple by -products and insufficient oxidation way.

Description

Technical Field

[0001] This utility model relates to the field of wastewater purification technology, and in particular to an oxidation system suitable for deep purification of industrial wastewater. Background Technology

[0002] Advanced oxidation technology is one of the core technologies for solving the problem of treating recalcitrant organic wastewater.

[0003] Among them, ozone-based catalytic oxidation and hydrogen peroxide-based catalytic oxidation technologies can generate a large number of hydroxyl radicals (·OH, oxidation potential 2.8V), which can efficiently degrade stubborn pollutants such as benzene series compounds, phenols, and heterocyclic compounds, and are widely used in the deep treatment of wastewater.

[0004] However, the aforementioned advanced oxidation technologies (such as Fenton, ozone / UV, hydrogen peroxide / UV, and ozone / solid catalysis) have significant limitations in practical applications:

[0005] 1. Low oxidant mixing efficiency: Hydrogen peroxide and wastewater are often mixed by single stirring, which can easily lead to local concentrations that are too high or too low, resulting in uneven ·OH generation; Ozone and wastewater are often diffused through traditional aeration discs, which have large bubble diameters (≥1mm) and short residence times, resulting in an ozone dissolution rate of only 40%-60% and low oxidant utilization.

[0006] 2. Inaccurate control of reaction conditions: pH value is the core parameter affecting the efficiency of ·OH generation (optimal pH 7-9). Existing systems often adopt the method of adjusting the wastewater pH in advance once, ignoring the impact of pH drop after the decomposition of large organic molecules into small acid molecules during the reaction on the system's oxidation efficiency. In addition, the heat generated by the UV lamp and the exothermic reaction during the reaction will cause the wastewater temperature to rise above 40°C. Ozone solubility (in water) decreases significantly at temperatures above 35°C, and the decomposition rate increases significantly (half-life shortened by 50%). Furthermore, as the temperature rises, the ineffective thermal decomposition rate of hydrogen peroxide will increase sharply, far exceeding the rate of photocatalytic decomposition, becoming the main pathway for hydrogen peroxide consumption and further reducing oxidation efficiency.

[0007] 3. Poor adaptability to operating modes: Most of them adopt a continuous flow water inlet mode, and the residence time of wastewater in the reactor is greatly affected by the fluctuation of the inlet water flow rate, making it difficult to ensure that pollutants are fully degraded and the COD removal rate of the effluent is unstable;

[0008] 4. Potential for secondary pollution, affecting the effectiveness of subsequent treatment processes: Iron salts in the Fenton process and solid catalysts in the ozone process generate chemical sludge, which can lead to increased heavy metal concentrations in the effluent and introduce impurity salts, affecting the membrane lifespan of subsequent UF / RO processes, as well as the purity of products recovered from "zero discharge" and resource recycling processes.

[0009] 5. Insufficient oxidation pathway: It heavily relies on hydroxyl radicals. Although its oxidizing power is strong, it lacks selectivity and is easily quenched and consumed by a large amount of background substances such as carbonate and chloride ions in wastewater. As a result, the amount of oxidant allocated to the truly difficult-to-degrade "target pollutants" is limited. This leads to a slow reaction rate for pollutants with specific stable structures and low electron cloud density (such as certain perfluorinated compounds and chloroalkanes).

[0010] Therefore, how to achieve a synergistic catalytic oxidation system of UV, hydrogen peroxide, and ozone that is efficient, under controllable conditions, stable in operation, and environmentally friendly, in order to improve the treatment effect of recalcitrant wastewater and the practicality of the system, has become a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0011] In view of the above-mentioned defects of the prior art, this utility model provides an oxidation system suitable for deep purification of industrial wastewater. The purpose is to solve the problems of low oxidant utilization rate, unstable reaction environment, many by-products and insufficient oxidation pathways in existing oxidation devices, so as to achieve efficient wastewater treatment and safe and stable operation of equipment.

[0012] To achieve the above objectives, this utility model discloses an oxidation system suitable for deep purification of industrial wastewater, including a regulating unit box;

[0013] The regulating unit box takes in water through the inlet and exits water through the outlet. The top is connected to the exhaust gas destroyer through the exhaust port. It is connected to the circulating ozone addition pipeline through the circulating water outlet and circulating water inlet. Liquid alkali is obtained from the liquid alkali storage tank through the liquid alkali dosing port and hydrogen peroxide is obtained from the hydrogen peroxide storage tank through the hydrogen peroxide dosing port. It is also equipped with an online level gauge to collect the internal liquid level height, an online pH meter to collect the pH value of the internal water, and a stirrer.

[0014] The circulating ozone addition pipeline, from the circulating water outlet to the circulating water inlet, includes a mixed liquid circulation pump, an ejector, a UV reactor, and a tubular heat exchanger in sequence.

[0015] The jet injector includes an ozone injection port, through which an ozone generator is connected, and ozone is introduced from the ozone generator.

[0016] Preferably, the pipeline from the hydrogen peroxide dosing port to the hydrogen peroxide storage tank is equipped with a hydrogen peroxide flow control device and a hydrogen peroxide dosing pump in sequence, and the mass ratio of hydrogen peroxide to ozone is controlled at 1:2 to 1:5 by the hydrogen peroxide flow control device and the hydrogen peroxide dosing pump.

[0017] Preferably, the pipeline from the liquid alkali inlet to the liquid alkali storage tank is equipped with a liquid alkali flow controller and a liquid alkali dosing pump in sequence, and liquid alkali is added to the regulating unit box through the liquid alkali flow controller and the liquid alkali dosing pump;

[0018] The concentration of the added liquid alkali is controlled by the feedback signal of the online pH meter, and the pH of the regulating unit box is maintained between 7 and 9 by the liquid alkali flow controller.

[0019] Preferably, the water inlet is equipped with a water inlet valve; the water inlet valve is opened and closed according to the feedback control of the online level gauge to maintain the vertical distance between the liquid level in the regulating unit box and the top of the box at no less than 25cm.

[0020] Preferably, the circulating water outlet is equipped with a circulating water outlet valve; the circulating water inlet is equipped with a circulating water inlet valve; the water outlet is equipped with a water outlet valve; and the UV reactor has an independent power supply cabinet.

[0021] Preferably, the top of the regulating unit housing is equipped with a breathing valve.

[0022] Preferably, the adjustment unit housing has an inspection port on the side wall near the bottom.

[0023] Preferably, the pipeline connecting the ozone filling port to the ozone generator is an SS316 pipe and is equipped with an ozone concentration detector.

[0024] Preferably, the tubular heat exchanger obtains cold phase liquid from the cooling circulation system, and uses the cold phase liquid to reduce the temperature, controlling the temperature to not exceed 35°C.

[0025] Preferably, a demister is provided between the exhaust port and the exhaust gas destroyer;

[0026] A fan is installed at the end of the exhaust gas breaker.

[0027] The beneficial effects of this utility model are:

[0028] This invention features high mass transfer and reaction efficiency. Through the combined structure of the regulating unit and the ejector, hydrogen peroxide and wastewater are thoroughly mixed, maintaining the pH within the optimal range. The high-intensity shearing and stirring action of the ejector achieves efficient gas-liquid mixing of ozone and wastewater, which then immediately enters the ultraviolet reaction unit for irradiation. Furthermore, the heat exchanger unit further reduces the high-temperature impact of the UV reaction unit, minimizing the ineffective decomposition of hydrogen peroxide, ensuring ozone solubility, and improving oxidant utilization. The entire system boasts high mass transfer efficiency and full energy utilization.

[0029] This invention offers flexible operation and a high degree of automation, integrating online pH detection, online liquid level detection, and flow control instruments for precise control of reaction conditions. Employing a sequencing batch reactor (SBR) cyclic reaction mode ensures sufficient reaction residence time, allowing for complete degradation of pollutants and resulting in stable and reliable treatment effects.

[0030] This invention produces pure water free of external impurities, ensuring resource utilization and reuse. It adopts a pure homogeneous photocatalytic reaction mechanism, eliminating the inherent problems of loss, wear and recycling of solid catalysts.

[0031] This invention avoids the generation of chemical sludge at the source, produces pure effluent, effectively protects the safety of subsequent membrane processes, and lays a solid foundation for the high-value resource recovery of wastewater salts.

[0032] This invention ingeniously integrates ultraviolet light, ozone, and hydrogen peroxide into a single system, achieving not only simple synergistic effects but also triggering the synergistic and proliferation of chemical reaction pathways, thus constructing a "three-dimensional oxidation network" composed of various reactive oxygen species with diverse attack methods.

[0033] The following will further explain the concept, specific structure and technical effects of this utility model in conjunction with the accompanying drawings, so as to fully understand the purpose, features and effects of this utility model. Attached Figure Description

[0034] Figure 1 A schematic diagram of an embodiment of the present invention is shown.

[0035] In the diagram: 101, Inlet valve; 102, Outlet valve; 103, Circulating water outlet valve; 104, Circulating water inlet valve; 201, Hydrogen peroxide storage tank; 202, Hydrogen peroxide dosing pump; 203, Hydrogen peroxide flow controller; 301, Liquid alkali storage tank; 302, Liquid alkali dosing pump; 303, Liquid alkali flow controller; 401, Regulating unit housing; 402, Outlet; 403, Breather valve; 404, Inlet; 405, Inspection port; 406, Circulating water inlet; 4 07. Circulating water outlet; 408. Hydrogen peroxide inlet; 409. Liquid alkali inlet; 410. Exhaust outlet; 411. Online level gauge; 412. Online pH meter; 413. Agitator; 501. Ozone generator; 502. Circulating pump; 503. Ejector; 504. Ozone injection port; 601. UV reactor; 602. Power supply cabinet; 701. Tubular heat exchanger; 702. Cooling circulation system; 801. Demister; 802. Exhaust gas destroyer; 803. Fan. Detailed Implementation

[0036] Example: Figure 1 As shown, an oxidation system suitable for deep purification of industrial wastewater includes a regulating unit housing 401.

[0037] The regulating unit box 401 takes in water through the inlet 404 and exits water through the outlet 402. The top is connected to the exhaust gas destroyer 802 through the exhaust port 410. It is connected to the circulating ozone addition pipeline through the circulating water outlet 407 and the circulating water inlet 406. Liquid alkali is obtained from the liquid alkali storage tank 301 through the liquid alkali dosing port 409, and hydrogen peroxide is obtained from the hydrogen peroxide storage tank 201 through the hydrogen peroxide dosing port 408. It is equipped with an online liquid level gauge 411 to collect the internal liquid level height, an online pH meter 412 to collect the pH value of the internal water, and a stirrer 413.

[0038] The circulating ozone addition pipeline from the circulating water outlet 407 to the circulating water inlet 406 includes, in sequence, a mixed liquid circulation pump 502, an ejector 503, a UV reactor 601, and a tubular heat exchanger 701.

[0039] The jet injector 503 includes an ozone injection port 504, which is connected to an ozone generator 501 to introduce ozone from the ozone generator 501.

[0040] In practical applications, this invention is a sequencing batch reaction, with the reaction time controlled between 0.5 and 2 hours. Wastewater enters the regulating unit tank 401 from the inlet 404. After the online level gauge 411 senses that the liquid level in the tank has reached the designed height, the water intake is stopped, and at the same time, the agitator 413 is turned on to ensure that the hydrogen peroxide, liquid alkali, and wastewater are fully mixed.

[0041] After passing through the mixed liquid circulation pump 502, the wastewater is mixed with ozone in the ejector 503 and then enters the UV reactor 601.

[0042] The ratio of ozone dosage concentration to the expected COD removal mass is controlled between 3:1 and 5:1, and the ratio of ozone volume to circulating water flow rate is controlled between 1:5 and 1:15.

[0043] In some embodiments, the pipeline from hydrogen peroxide dosing port 408 to hydrogen peroxide storage tank 201 is sequentially equipped with a hydrogen peroxide flow control device 203 and a hydrogen peroxide dosing pump 202, and the mass ratio of hydrogen peroxide to ozone is controlled at 1:2 to 1:5 by the hydrogen peroxide flow control device 203 and the hydrogen peroxide dosing pump 202.

[0044] In some embodiments, the pipeline from the liquid alkali inlet 409 to the liquid alkali storage tank 301 is sequentially equipped with a liquid alkali flow controller 303 and a liquid alkali dosing pump 302, and liquid alkali is added to the regulating unit box 401 through the liquid alkali flow controller 303 and the liquid alkali dosing pump 302.

[0045] The concentration of added liquid alkali is controlled by the feedback signal of the online pH meter 412, and the pH of the regulating unit box 401 is maintained between 7 and 9 by the liquid alkali flow controller 303.

[0046] In some embodiments, the inlet 404 is provided with an inlet valve 101; the inlet valve 101 is opened and closed according to the feedback control of the online level gauge 411 to maintain the vertical distance between the liquid level in the regulating unit box 401 and the top of the box not less than 25cm.

[0047] In some embodiments, the circulating water outlet 407 is provided with a circulating water outlet valve 103; the circulating water inlet 406 is provided with a circulating water inlet valve 104; the outlet 402 is provided with an outlet valve 102; and the UV reactor 601 has an independent power supply cabinet 602.

[0048] In some embodiments, a breather valve 403 is provided on the top of the regulating unit housing 401.

[0049] In practical applications, the presence of the breather valve 403 can maintain stable pressure in the chamber.

[0050] In some embodiments, the side wall of the adjustment unit housing 401 near the bottom is provided with an access port 405.

[0051] In practical applications, the presence of the inspection port 405 facilitates operation and maintenance, reduces safety hazards, and makes it easier for maintenance personnel to disassemble and repair the mixer 413.

[0052] In some embodiments, the pipeline connecting the ozone filling port 504 to the ozone generator 501 is an SS316 pipe and is equipped with an ozone concentration detector.

[0053] In practical applications, for the safety and durability of the system, the ozone-introducing pipeline needs to be made of a suitable material based on the ozone concentration and pressure under maximum load. The material can be SS316 pipe.

[0054] To reduce the impact of ozone generator's actual ozone output decay caused by fluctuations in current, voltage, gas pressure, or component wear, an ozone concentration detector can be installed in the ozone introduction pipeline to ensure that the ozone concentration entering the ozone catalytic oxidation unit meets the design requirements.

[0055] In some embodiments, the tubular heat exchanger 701 obtains cold phase liquid from the cooling circulation system 702, and uses the cold phase liquid to lower the temperature, controlling the temperature to not exceed 35°C.

[0056] In practical applications, the tubular heat exchanger 701 obtains cold phase liquid from the cooling circulation system 702, lowers the temperature through the cold phase liquid, and controls the temperature to not exceed 35°C, which can reduce the ineffective decomposition of hydrogen peroxide and ensure ozone solubility.

[0057] In some embodiments, a demister 801 is provided between the exhaust port 403 and the exhaust gas destroyer 802;

[0058] A fan 803 is installed at the end of the exhaust gas breaker 802.

[0059] In practical applications, installing a demister 801 between the exhaust port 403 and the exhaust gas destroyer 802 can prevent liquid water mist carried in ozone exhaust gas from corroding the equipment.

[0060] The exhaust gas breaker 802 is equipped with a fan 803 at the end, which can provide stable airflow power to ensure that the exhaust gas and the medium in the breaker are in full contact.

[0061] In practical applications, the purification principle of this invention is as follows:

[0062] Ozone + Ultraviolet Light:

[0063] O₂ + hν → O₂ + 1O₂ (excited oxygen atom)

[0064] 1 O2 + H2O → 2·OH (core hydroxyl radical pathway)

[0065] Ozone + hydrogen peroxide:

[0066] O3 + H2O2 → ·OH + O2 + HO2· (peroxyhydroxyl radical pathway)

[0067]

[0068] Ultraviolet light + hydrogen peroxide:

[0069] H₂O₂ + hν → 2·OH (core hydroxyl radical pathway)

[0070] Chain reaction proliferation:

[0071] The ·OH, HO2·, and O2·- produced by the above reactions can then undergo a series of chain reactions with ozone, hydrogen peroxide, and organic matter in wastewater, continuously proliferating and transforming into more types of active intermediates, forming a dynamic, continuous, and self-reinforcing oxidizing environment. More importantly, ultraviolet light, ozone, and hydrogen peroxide are themselves highly efficient oxidants, possessing inherent and complementary selectivity for different types of pollutants.

[0072] Hydroxyl radicals can attack almost all organic matter indiscriminately, comprehensively degrading pollutants in wastewater; ozone molecules have an electrophilic attack, preferentially attacking electron-rich groups and unsaturated bonds (representative wastewater: dyeing and printing wastewater, phenolic wastewater); hydrogen peroxide molecules have a nucleophilic attack, showing strong selectivity in reacting with sulfides and cyanides (representative wastewater: sulfur-containing and cyanide-containing wastewater); superoxide anions and other substances have reducing attack properties, acting as single-electron reducing agents to reduce complexed heavy metals, promoting their precipitation, and are even more effective in reducing certain perfluorinated compounds (PFOA / PFOS) that are difficult to attack with ·OH.

[0073] Due to the diversity and complementarity of degradation methods, this invention can effectively address industrial wastewater with complex composition, large fluctuations in water quality, and multiple recalcitrant pollutants. Its treatment efficiency is far superior to any single or dual advanced oxidation technology in terms of stability and broad-spectrum effectiveness.

[0074] The preferred embodiments of this utility model have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of this utility model without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of this utility model through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. An oxidation system suitable for deep purification of industrial wastewater; characterized in that, Including the regulating unit housing (401); The regulating unit box (401) takes in water through the inlet (404) and exits water through the outlet (402). The top is connected to the exhaust gas destroyer (802) through the exhaust port (410). It is connected to the circulating ozone addition pipeline through the circulating water outlet (407) and the circulating water inlet (406). It obtains liquid alkali from the liquid alkali storage tank (301) through the liquid alkali dosing port (409) and hydrogen peroxide from the hydrogen peroxide storage tank (201) through the hydrogen peroxide dosing port (408). It is equipped with an online level gauge (411) to collect the internal liquid level height, an online pH meter (412) to collect the pH value of the internal water, and a stirrer (413). The circulating ozone addition pipeline, from the circulating water outlet (407) to the circulating water inlet (406), includes a mixed liquid circulation pump (502), an ejector (503), a UV reactor (601), and a tubular heat exchanger (701). The jet injector (503) includes an ozone injection port (504), through which an ozone generator (501) is connected, and ozone is introduced from the ozone generator (501).

2. The oxidation system for deep purification of industrial wastewater according to claim 1, characterized in that, The pipeline from the hydrogen peroxide dosing port (408) to the hydrogen peroxide storage tank (201) is sequentially equipped with a hydrogen peroxide flow control device (203) and a hydrogen peroxide dosing pump (202). The hydrogen peroxide flow control device (203) and the hydrogen peroxide dosing pump (202) control the mass ratio of hydrogen peroxide and ozone to 1:2 to 1:

5.

3. The oxidation system for deep purification of industrial wastewater according to claim 1, characterized in that, The pipeline from the liquid alkali inlet (409) to the liquid alkali storage tank (301) is equipped with a liquid alkali flow controller (303) and a liquid alkali dosing pump (302) in sequence. Liquid alkali is added to the regulating unit box (401) through the liquid alkali flow controller (303) and the liquid alkali dosing pump (302). The concentration of the added liquid alkali is controlled by the feedback signal of the online pH meter (412), and the pH of the regulating unit box (401) is maintained between 7 and 9 by the liquid alkali flow controller (303).

4. The oxidation system for deep purification of industrial wastewater according to claim 1, characterized in that, The inlet (404) is equipped with an inlet valve (101); the inlet valve (101) is opened and closed according to the feedback control of the online level gauge (411) to maintain the vertical distance between the liquid level in the regulating unit box (401) and the top of the box at no less than 25cm.

5. The oxidation system for deep purification of industrial wastewater according to claim 1, characterized in that, The circulating water outlet (407) is equipped with a circulating water outlet valve (103); the circulating water inlet (406) is equipped with a circulating water inlet valve (104); the water outlet (402) is equipped with a water outlet valve (102); the UV reactor (601) has an independent power supply cabinet (602).

6. The oxidation system for deep purification of industrial wastewater according to claim 1, characterized in that, The top of the regulating unit housing (401) is equipped with a breather valve (403).

7. The oxidation system for deep purification of industrial wastewater according to claim 1, characterized in that, The adjustment unit housing (401) has an inspection port (405) on its side wall near the bottom.

8. The oxidation system for deep purification of industrial wastewater according to claim 1, characterized in that, The ozone filling port (504) is connected to the ozone generator (501) via an SS316 pipe and is equipped with an ozone concentration detector.

9. The oxidation system for deep purification of industrial wastewater according to claim 1, characterized in that, The tubular heat exchanger (701) obtains cold phase liquid from the cooling circulation system (702), and lowers the temperature through the cold phase liquid, controlling the temperature to not exceed 35°C.

10. The oxidation system for deep purification of industrial wastewater according to claim 1, characterized in that, A demister (801) is provided between the exhaust port (410) and the exhaust gas destroyer (802); A fan (803) is installed at the end of the exhaust gas breaker (802).

Images