Environment-friendly low-carbon hazardous-waste-free industrial wastewater zero-discharge organic matter treatment device and process

Abstract

The invention discloses a green low-carbon hazardous-waste-free industrial wastewater zero-discharge organic matter treatment device and process, and relates to the technical field of industrial wastewater zero-discharge organic matter treatment, the device comprises an ozone preparation system, a micro-nano bubble device and an oxidation reactor; a water inlet of the oxidation reactor is connected with a wastewater pipeline; the micro-nano bubbler comprises a water source inlet and a gas source inlet, the water source inlet is connected with the middle upper part of the oxidation reactor, and the gas source inlet is connected with the ozone preparation system; a micro-nano bubble ejector is arranged in the oxidation reactor, and the micro-nano bubble ejector is connected with an outlet of the micro-nano bubble device. The treatment process provided by the invention can overcome the defects of the existing process, and can replace the existing process to better meet the zero discharge demand of the industrial wastewater in the aspect of treatment of organic matters in the industrial wastewater.

Description

Technical Field

[0001] The present invention relates to the technical field of zero-discharge organic matter treatment of industrial wastewater, and in particular to a green, low-carbon, and non-hazardous waste industrial wastewater zero-discharge organic matter treatment device and process. Background Art

[0002] Since the beginning of the 21st century, my country's industrial wastewater treatment has entered an era of vigorous development of "zero discharge." Zero discharge technology is one of the new wastewater treatment technologies developed in recent years. Its principle is to use a series of devices, such as membrane separation, to intercept and concentrate pollutants in wastewater, thereby achieving the goal of water purification.

[0003] Zero discharge of industrial wastewater faces challenges such as complex pollutants, high salinity, high COD (chemical oxygen demand) and high color. Among them, the treatment of organic matter is crucial to zero discharge of industrial wastewater. This is because salt itself can be used to concentrate concentrated water and separate fresh water for production reuse using multi-stage membrane separation technology. However, organic pollutants have a fouling effect on separation membranes (especially the organic separation membranes currently in common use). For example, the most typical RO reverse osmosis membrane is a technology that applies pressure on one side of the semipermeable membrane to counteract the osmotic pressure caused by high salt water, thereby separating fresh water from high salt water. Under the action of pressure, organic matter in the water, such as humic acid, protein, and oil, easily adheres to the membrane surface through physical adsorption or chemical bonding, gradually accumulating to form a gel layer, increasing mass transfer resistance. In addition, small molecular organic matter may enter the membrane pores, causing pore blockage and reducing membrane flux. More seriously, some organic matter provides a nutrient source for microorganisms, promoting the growth of biofilm on the membrane surface, and its metabolites further exacerbate pollution. This multi-level contamination not only leads to a decrease in water production efficiency, but also may change the membrane selectivity and affect the water quality. Other membrane separation technologies may apply slightly lower pressures than RO membranes, but the impact of organic matter fouling on the separation membranes is similar. The above scenario illustrates only one example of zero-discharge organic matter treatment in industrial wastewater. Other areas where organic matter treatment is necessary include treating brine before it enters the evaporator, treating mother liquor before centrifugation, and breaking up organically complexed heavy metal wastewater.

[0004] Commonly used methods for treating organic matter include Fenton oxidation, biochemical treatment, and adsorption. However, these methods may generate large amounts of hazardous waste, introduce other impurities, require a large footprint, or have high investment and operating costs. Ozone oxidation, on the other hand, offers advantages such as no introduction of impurities, a small footprint, low operating costs, and high stability. However, the most commonly used ozone oxidation method on the market is catalytic ozone oxidation, which uses a catalyst and therefore generates hazardous waste. Furthermore, as the catalyst gradually loses its effectiveness, its oxidation capacity decreases, leading to poor COD removal.

[0005] Based on this, the present invention proposes a new treatment method: high-concentration micro-nano bubble ozone oxidation method, which not only overcomes the above-mentioned shortcomings, but also solves the key mass transfer problem in the ozone oxidation process of wastewater treatment, greatly improves the oxidation reaction efficiency, and enhances the COD removal ability. Its degradation products are water and carbon dioxide, and there is no secondary pollution at all, truly realizing the green and low-carbon environmentally friendly water treatment requirements. Summary of the Invention

[0006] In order to solve the above technical problems, the present invention provides a green, low-carbon, and non-hazardous waste industrial wastewater zero-discharge organic matter treatment device, comprising an ozone preparation system, a micro-nano bubbler, and an oxidation reactor;

[0007] The water inlet of the oxidation reactor is connected to the wastewater pipeline;

[0008] The micro-nano bubbler includes a water source inlet and an air source inlet, the water source inlet is connected to the middle and upper part of the oxidation reactor, and the air source inlet is connected to the ozone preparation system;

[0009] A micro-nano bubble ejector is provided in the oxidation reactor and is connected to an outlet of the micro-nano bubbler.

[0010] Furthermore, the ozone preparation system includes an ozone generator and an oxygen source connected to the ozone generator; a chiller is connected to the ozone generator;

[0011] The ozone generator is connected to the gas source inlet of the micro-nano bubbler.

[0012] Furthermore, the oxygen source is purchased high-purity oxygen; or the oxygen source comes from an oxygen concentrator, and the oxygen concentrator is sequentially connected to an air compressor, a filter and a dryer.

[0013] Furthermore, a circulation pump is provided on the pipeline between the oxidation reactor and the water source inlet of the micro-nano bubbler.

[0014] Furthermore, the wastewater treatment device also includes an ozone residual gas treatment system, and the ozone residual gas treatment system is connected to the top of the oxidation reactor.

[0015] Furthermore, the ozone waste gas treatment system includes an ozone waste gas destroyer and an exhaust fan which are sequentially connected to the oxidation reactor.

[0016] Furthermore, a pH dosing system and a pH sensor are sequentially provided on the pipeline between the oxidation reactor and the micro-nano bubbler.

[0017] Furthermore, a breathing valve, a pressure sensor, a temperature sensor and a liquid level sensor are provided on the oxidation reactor.

[0018] The present invention also claims protection for a wastewater treatment process, which uses the green, low-carbon, non-hazardous waste, zero-emission organic matter treatment device for industrial wastewater, comprising the following steps:

[0019] (1) The wastewater pipeline valve is opened and the wastewater to be treated is injected into the oxidation reactor to the appropriate liquid level;

[0020] (2) starting the ozone preparation system to prepare ozone;

[0021] (3) The wastewater to be treated and the ozone in the oxidation reactor are sent into the micro-nano bubbler together to produce a water flow containing high-concentration ozone micro-nano bubbles, which is then sent into the oxidation reactor;

[0022] (4) The micro-nano bubble ejector evenly ejects water containing high-concentration ozone micro-nano bubbles into the oxidation reactor, where the ozone molecules fully contact the wastewater and disinfect it and degrade organic matter;

[0023] (5) After disinfection and organic matter degradation are completed, the water outlet of the oxidation reactor is opened to discharge the treated wastewater.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] The high-concentration micro-nano bubble ozone oxidation process of the present invention combines the direct oxidation effect of ozone molecules with the synergistic effect of the chain reaction of free radicals, thereby improving the overall oxidation capacity and oxidation efficiency and expanding the applicable scenarios of the ozone oxidation reaction mechanism. Compared with common non-ozone oxidation methods for treating organic matter, the high-concentration micro-nano bubble ozone oxidation process produces water and carbon dioxide after oxidizing organic matter. It does not introduce other impurities, produces no waste, and does not generate secondary pollution. It occupies a small area, has low operating costs, has a high COD removal rate, is highly stable, and is highly compatible with other processes. Compared with the ozone catalytic oxidation method, which is also an ozone oxidation method, the high-concentration micro-nano bubble ozone oxidation process uses a higher ozone concentration, and the micro-nano bubble specific surface area is exponentially increased, molecular collisions are more intense, and active free radicals are more easily generated. As a result, the speed and capacity of the oxidation reaction are greatly improved. The mass transfer efficiency of micro-nano bubbles is 5-10 times higher than that of traditional large bubbles in aeration, and the ozone utilization rate can reach over 90%. This greatly reduces the amount of ozone added to achieve an equivalent oxidation effect, improves pollutant removal efficiency, and reduces operating energy consumption. In addition, the lack of the need to add fillers or catalysts means there is no waste at all, and there is no need to worry about the oxidation capacity declining due to the gradual failure of fillers or catalysts. The high-concentration micro-nano bubble ozone oxidation process can not only oxidize and degrade organic matter, but also quickly penetrate the microbial cell membrane, destroy the nucleic acid and enzyme system, achieve the effect of inactivating microorganisms, and perform deodorization, decolorization and other purification operations on the water body. It is an organic matter treatment process with multiple functions and is very suitable for zero-discharge wastewater treatment.

[0026] The high-concentration micro-nano bubble ozone oxidation process can overcome the drawbacks of existing processes and can replace existing processes in the treatment of organic matter in wastewater to better meet the demand for zero wastewater discharge. It has shown remarkable results in reducing contamination of reverse osmosis membranes, breaking the complexation state of heavy metal complexes, reducing organic sticky fouling and foam generation rates in evaporators, and increasing the purity and crystal growth rate of crystalline salts. These applications can help companies achieve resource recovery as much as possible while achieving zero wastewater discharge, achieving a green, low-carbon, and non-hazardous waste-generating effect, bringing sustainable economic and environmental benefits to companies and society, and also practicing the concept of green development and enhancing the influence of environmental protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the structural design of the green, low-carbon, and hazardous waste-free industrial wastewater zero-emission organic matter treatment device of the present invention.

[0028] Among them, 1. Oxidation reactor; 2. Micro-nano bubbler; 3. Ozone residual gas destroyer; 4. Exhaust fan; 5. Micro-nano bubble ejector; 6. Ozone generator; 7. Air compressor; 8. Filter; 9. Dryer; 10. Oxygen generator; 11. Chiller; 12. pH dosing tank; 13. pH dosing pump; 14. Circulation pump; 15. Breathing valve; 16. Pressure sensor; 17. pH sensor; 18. Temperature sensor; 19. Liquid level sensor. DETAILED DESCRIPTION

[0029] The following description is intended to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are merely examples, and those skilled in the art may conceive of other obvious variations.

[0030] In the treatment of organic matter in wastewater, the present invention addresses the defects and pain points of existing processes and proposes a green, low-carbon, and non-hazardous waste organic matter treatment process that is more suitable for zero discharge of industrial wastewater. Specifically, it is a high-concentration micro-nano bubble ozone oxidation method. Compared with the existing process, the advantages and disadvantages are compared as shown in Table 1.

[0031] Table 1 Advantages and disadvantages of the process of the present invention compared with the existing process

[0032]

[0033] From the above comparative analysis, it can be seen that the high-concentration micro-nano bubble ozone oxidation process has absolute comprehensive advantages compared with the existing process. It can avoid the shortcomings and deficiencies of the existing process. It is an organic matter treatment process that does not introduce impurities, does not require catalysts, does not produce hazardous waste, does not cause secondary pollution, has high investment cost performance, low operating costs, occupies a small area, has strong oxidation capacity, and has a stable COD removal effect.

[0034] This process uses ozone at a concentration far higher than that used in catalytic ozone oxidation. High ozone concentrations not only increase the ozone's own oxidation rate on organic matter but also generate more active free radicals, leveraging the free radicals' higher redox potential to oxidize organic matter. This is more efficient and environmentally friendly than using catalysts to generate active free radicals. It produces no hazardous waste and eliminates the need to worry about catalyst failure leading to a decrease in oxidation effectiveness. The direct oxidative action of ozone molecules, synergistic with the free radical chain reaction, ensures efficient and rapid degradation of organic matter and inactivation of microorganisms.

[0035] The ozone used in this process is in the form of micro-nano bubbles in water, which solves the problem of difficult mass transfer between gas and liquid. Compared with traditional large bubbles, micro-nano bubbles not only greatly increase the specific surface area of ​​the bubbles, but also greatly increase the solubility and residence time of ozone in water, stably improve the ozone utilization rate and oxidation reaction efficiency, and enhance the COD removal ability.

[0036] For zero discharge of industrial wastewater, this new organic matter treatment process can not only be used alone, but also has strong expansion capabilities due to its ozone-free residual characteristics. It can be combined with other mature processes, such as organic tubular ultrafiltration membranes, ion exchange resins, reverse osmosis membranes, nanofiltration membranes, evaporators, etc., to better find the optimal solution according to the characteristics of the wastewater to be treated, and help the entire wastewater treatment zero discharge to be implemented smoothly. Especially in the treatment of organic matter in some highly difficult wastewaters, it is powerful and difficult to replace.

[0037] The high-concentration micro-nano bubble ozone oxidation process described in this invention is a novel advanced oxidation process. It combines the strong oxidizing properties of high-concentration ozone with the efficient gas-liquid mass transfer and long residence time of micro-nano bubbles. It primarily utilizes micro-nano bubbles (typically ranging in diameter from 1 micron to several hundred nanometers) to address the critical mass transfer issue, improving the dissolution efficiency and reactivity of high-concentration ozone in water.

[0038] In this process, the ozone gas used comes from an oxygen source high-concentration ozone generator. The ozone generator converts oxygen into high-concentration ozone gas through a high-voltage electric field. The oxygen can be purchased pure oxygen or prepared through an oxygen generator.

[0039] In this process, the ozone gas used is high-concentration ozone gas, with an ozone concentration greater than 150mg / L. Ozone itself has a high redox potential of 2.07V, which can degrade most organic matter. Compared with traditional low-concentration ozone, the higher the ozone concentration, the more ozone molecules there are per unit volume, the greater the probability of collision with pollutants, and the faster the direct oxidation reaction rate. In addition, high-concentration ozone is more easily decomposed in water to produce active free radicals, such as hydroxyl radicals, which have a higher redox potential of up to 2.8V, much higher than ozone itself, and can degrade almost all stubborn organic matter. When degrading organic matter, the oxidation products are water and carbon dioxide, so there is no introduction of impurities and no secondary pollution. It is highly compatible with other processes and can be used in combination to achieve the requirement of zero wastewater discharge. High-concentration ozone can also quickly penetrate microbial cell membranes, destroy nucleic acids and enzyme systems, and achieve the effect of inactivating microorganisms.

[0040] In this process, the ozone gas used is formed into micro-nano bubbles by a micro-nano bubbler and then introduced into the water body for an oxidation reaction. Micro-nano bubbles can be produced through various methods such as pressurized dissolution-decompression release or fluid shearing. A micro-nano bubbler is a special device that uses the above principles to produce micro-nano bubbles. Micro-nano bubbles typically range in diameter from 1 micron to several hundred nanometers and have an extremely large specific surface area, which can significantly increase the solubility and residence time of ozone in water. The bubble surface is negatively charged, which prevents binding through electrostatic repulsion, thereby maintaining stable dispersion. This is especially effective in water bodies with high viscosity. The mass transfer efficiency of micro-nano bubbles is 5-10 times higher than that of traditional large aeration bubbles, and the ozone utilization rate can reach over 90%. This greatly reduces the amount of ozone added to achieve an equivalent oxidation effect, improves pollutant removal efficiency, and reduces operating energy consumption. The cavitation effect when the bubbles burst can also produce reactive oxygen species (such as hydroxyl radicals), further enhancing the oxidation capacity. The direct oxidation effect of ozone molecules and the chain reaction of free radicals work synergistically to quickly degrade organic matter and inactivate microorganisms. The inactivation rate of E. coli is greater than 99.9%, and there is no risk of drug resistance.

[0041] A green, low-carbon, and non-hazardous waste industrial wastewater zero-emission organic matter treatment device comprises an ozone preparation system, a micro-nano bubbler 2, an oxidation reactor 1, an ozone residual gas treatment system, a PLC control system, and a human-machine interface.

[0042] The water inlet of the oxidation reactor 1 is connected to the wastewater pipe, and the wastewater is treated by ozone oxidation inside the oxidation reactor 1 and then discharged through the water outlet of the oxidation reactor 1.

[0043] The micro-nano bubbler 2 includes a water source inlet and an air source inlet. The water source inlet is connected to the middle and upper part of the oxidation reactor 1, and the air source inlet is connected to the ozone preparation system.

[0044] A micro-nano bubble ejector 5 is provided at the bottom of the oxidation reactor 1 , and the micro-nano bubble ejector 5 is connected to the outlet of the micro-nano bubbler 2 .

[0045] The ozone preparation system includes an ozone generator 6 and an oxygen source connected to the ozone generator 6 .

[0046] In a specific embodiment, the oxygen source is purchased high-purity oxygen, and the oxygen cylinder is connected to the ozone generator 6 to prepare ozone.

[0047] In another specific embodiment, the oxygen source comes from an oxygen concentrator 10. Specifically, the ozone production system includes an air compressor 7, a filter 8, a dryer 9, an oxygen concentrator 10, and an ozone generator 6. The air compressor 7 draws air from the surrounding environment and compresses it. The compressed air passes through a multi-stage precision filter 8 to remove impurities and particles. The air passes through a dryer 9 (specifically, a combination of a refrigerated dryer and an adsorption dryer) to remove moisture and lower the dew point. High-purity oxygen (≥93%) is then produced by the oxygen concentrator 10.

[0048] After the high-purity oxygen is adjusted in pressure and volume, it enters the ozone generator 6 and is converted into ozone gas through a high-voltage electric field. A large amount of heat is released during the preparation of ozone, so a chiller 11 needs to be connected to the ozone generator 6 to cool the ozone generator 6.

[0049] A circulation pump 14 is provided between the oxidation reactor 1 and the micro-nano bubbler 2. The circulation pump 14 is connected to the middle and upper part of the oxidation reactor 1 to extract water from the oxidation reactor 1 and send it to the micro-nano bubbler 2 to provide a water source for the micro-nano bubbler 2; the high-concentration ozone gas produced by the ozone preparation system simultaneously enters the micro-nano bubbler 2 to provide a gas source for the micro-nano bubbler 2. The micro-nano bubbler 2 is a special device that generates micro-nano bubbles through the principles of pressurized dissolution-decompression release or fluid shear method. The generated micro-nano bubbles return to the bottom of the oxidation reactor 1 together with the circulating water for release.

[0050] The oxidation reactor 1 is a relatively closed container with a breathing valve 15 for adjusting the internal air pressure of the oxidation reactor 1. An appropriate amount of wastewater to be treated is stored inside the oxidation reactor 1. The micro-nano bubble ejector 5 is installed at the bottom of the oxidation reactor 1 and is connected to the outlet of the micro-nano bubbler 2 through a pipe. The circulating water containing micro-nano bubbles is ejected from the bottom of the oxidation reactor 1 through the micro-nano bubble ejector 5, thereby contacting the wastewater to be treated in the oxidation reactor 1 body, generating an efficient oxidation reaction, degrading organic matter and inactivating microorganisms. The micro-nano bubble ejector 5 plays the role of uniform water distribution and multi-point release.

[0051] Before or during the reaction, the pH of the wastewater to be treated may not be at optimal conditions. A suitable pH can significantly improve the efficiency of the oxidation reaction, so a pH dosing system is required for dosing. The pH dosing system includes a pH dosing tank 12 and a pH dosing pump 13. The pH dosing pump 13 extracts the pH-adjusting agent from the pH dosing tank 12 and injects it into the pipeline of the wastewater treatment device to adjust the pH of the wastewater to be treated in real time. pH adjustment can be performed inside the oxidation reactor 1 or on the circulation pipeline.

[0052] The ozone waste gas treatment system consists of a waste ozone destructor 3 and an exhaust fan 4, among other key components. Because the micro-nano bubble formation significantly improves ozone utilization, minimal unconsumed ozone remains in the upper portion of the oxidation reactor 1. This gas enters the waste ozone destructor 3 via suction from the exhaust fan 4. The waste ozone destructor 3 contains a packing material and a temperature control system. Upon contact with ozone, the packing material degrades and removes 99.9% of the ozone. The optimal temperature increases ozone degradation efficiency, ensuring that the outlet concentration meets emission standards and is harmless to humans. The resulting gas is discharged into the surrounding environment via the exhaust fan 4.

[0053] The entire device is equipped with multiple pressure sensors 16, temperature sensors 18, liquid level sensors 19, pH sensors 17 and other instruments according to actual needs. The operation process is automatically executed by the PLC control system based on preset parameters and real-time data. The user can monitor the operation status on the human-machine interface.

[0054] by Figure 1 Taking the design scheme of a reaction device shown in the figure as an example, the wastewater treatment process using the green, low-carbon, non-hazardous waste, zero-emission organic matter treatment device for industrial wastewater of the present invention includes the following steps:

[0055] (1) Wastewater: Open the water inlet valve on the upper part of the oxidation reactor 1 and inject the wastewater to be treated into the oxidation reactor 1 to a suitable liquid level by means of a water pump or the like.

[0056] (2) Turn on the air compressor 7 to start preparing compressed air. After the prepared compressed air passes through the filter 8 and the dryer 9 and meets the requirements of the oxygen generator 10, turn on the oxygen generator 10 to prepare oxygen (the oxygen preparation process can also be replaced by purchasing pure oxygen). After the oxygen concentration reaches the requirements of the oxygen source high-concentration ozone generator 6, turn on the ozone generator 6 to purge the pipeline. At the same time, turn on the exhaust fan 4 to extract the excess gas in the oxidation reactor 1, and turn on the chiller 11 to provide circulating chilled water for the ozone generator 6. After the purge continues for a certain period of time, turn on the high-voltage electric field switch of the ozone generator 6 to prepare ozone.

[0057] (3) Then, the circulation pump 14 is turned on to allow the circulating water and the ozone gas to pass through the micro-nano bubbler 2 to form a water flow containing high-concentration ozone micro-nano bubbles and flow to the bottom of the oxidation reactor 1.

[0058] (4) The micro-nano bubble ejector 5 at the bottom of the oxidation reactor 1 is evenly sprayed in all directions. At this time, the high-concentration ozone micro-nano bubbles are fully in contact with the wastewater to be treated in the oxidation reactor 1. Through the direct oxidation of ozone molecules and the synergistic effect of the chain reaction of free radicals, organic matter is quickly and comprehensively degraded, microorganisms are inactivated, odor is removed, and color is decolored without introducing impurities. The oxidation products are water and carbon dioxide.

[0059] During the reaction, the pH is adjusted in real time by the pH dosing pump 13 to ensure that the oxidation reaction is always in the best state. The ozone residual gas generated by the reaction is degraded by the ozone residual gas destroyer 3 and then discharged into the surrounding environment by the exhaust fan 4.

[0060] (5) After the reaction is completed, the outlet valve at the bottom of the oxidation reactor 1 is opened, and the treated wastewater is sent to the next process section by means of a water pump or the like.

[0061] The entire reaction process described above is in a relatively closed state, which can be either a batch reaction or a continuous reaction. The typical process of the batch reaction is as described above, and the typical process of the continuous reaction can be achieved by relying on the reasonable control of the liquid level range by the sensor, or by overflow of the water seal elbow.

[0062] In actual applications, the device is used to oxidize organic matter in wastewater, thereby reducing the negative impact of the presence of organic matter on other process sections in the zero-discharge system, so that the entire wastewater treatment zero-discharge can be smoothly implemented. For example, when removing organic matter from the water inlet of the reverse osmosis membrane, the use of this device can not only degrade almost all stubborn organic matter and reduce the COD of the water body to a state close to zero, but also kill bacteria in the water body, perform deodorization, decolorization and other purification operations on the water body, avoid organic or biological contamination of the reverse osmosis membrane, extend the cleaning cycle and service life of the membrane, and ensure that the reverse osmosis membrane can operate stably for a long time. The device is also very effective in other scenarios where organic matter needs to be treated, such as the treatment of concentrated brine before entering the evaporator, the treatment of mother liquor before centrifugal separation, and the decomposition of organic complex heavy metal wastewater.

[0063] When the organic matter treatment process of the present invention is applied to the organic matter removal treatment of the reverse osmosis membrane inlet water in the zero discharge of industrial wastewater, the organic matter in the water is oxidized and degraded into water and carbon dioxide by high-concentration micro-nano bubble ozone, and microbial inactivation, deodorization and decolorization are simultaneously completed. It can then be softened and impurized by an ion exchange resin process, so that the salt in the water becomes a mixture of sodium chloride and sodium sulfate, and then desalinated by a multi-stage reverse osmosis membrane process, or salt separated by a multi-stage nanofiltration membrane process. Since the content of organic matter and microorganisms in the water after ozone oxidation treatment is extremely low, it can avoid organic or biological contamination of the reverse osmosis membrane and the nanofiltration membrane, extend the cleaning cycle and service life of the membrane, and ensure that the reverse osmosis membrane and the nanofiltration membrane can operate stably for a long time. The water produced by the reverse osmosis membrane can meet the requirements of industrial recycled water, and can also be further purified to meet the requirements of pure water, and reused as production water to the factory production line to achieve water resource recovery.

[0064] When the organic matter treatment process of the present invention is applied to the removal of organic matter from concentrated brine in zero-discharge industrial wastewater before it enters the evaporator, the organic matter in the concentrated brine is oxidized and degraded into water and carbon dioxide by high-concentration micro-nano bubble ozone. In the subsequent evaporation process, foam is difficult to form, the gas-liquid separation efficiency is improved, the water quality of the distilled water is guaranteed, and there is no need to worry about organic matter being adsorbed and concentrated on the surface of the heat exchanger during long-term operation, forming organic sticky dirt, resulting in reduced heat transfer efficiency of the evaporator, increased energy consumption, and even causing local overheating and accelerated equipment corrosion. The pollution of the evaporator is slowed down, the cleaning cycle is extended, and the difficulty of maintenance is greatly reduced. In addition, the problem of abnormal increase in boiling point caused by the rapid increase in organic matter concentration during the evaporation and concentration process will also be solved, and the evaporation efficiency can be maintained at a high level.

[0065] When the organic matter treatment process of the present invention is applied to the removal of organic matter from mother liquor prior to centrifugal separation in zero-discharge industrial wastewater, the organic matter in the mother liquor is oxidized and degraded into water and carbon dioxide by high-concentration micro-nano bubble ozone, effectively controlling factors that inhibit crystal growth. Crystallized salt can then be smoothly precipitated from the supersaturated mother liquor and separated by centrifugation without worrying about the organic matter causing the crystalline salt to become viscous and clog the centrifuge filter. Furthermore, since salt separation measures are typically implemented in the preceding process, the purity of the crystalline salt produced after organic matter removal is guaranteed, fully meeting industrial salt standards and allowing for recycling as a resource.

[0066] When the organic matter treatment process of the present invention is applied to the organic complex heavy metal wastewater in the zero-discharge of industrial wastewater, the organic complex structure in the organic complex heavy metal wastewater is destroyed by high-concentration micro-nano bubble ozone oxidation, and the heavy metal ions are separated from the complex state, and the chemical stability decreases. The corresponding heavy metal hydroxide insoluble matter can be generated under alkaline conditions, and then membrane separation is carried out by an organic tubular ultrafiltration membrane. The insoluble matter is all trapped in the membrane tube, and the water quality of the membrane water can stably meet the requirements of the most stringent electroplating pollutant emission standard table three in the industrial wastewater treatment industry. After the heavy metals are removed, the pollution properties are greatly reduced, and the wastewater can be further treated, ultimately achieving the purpose of zero discharge. The intercepted heavy metal hydroxide can be dehydrated by a filter press to form a relatively pure mud cake, and then the heavy metal sludge recovery technology can be used to achieve the recovery of heavy metals.

[0067] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions only describe the principles of the present invention. Various changes and improvements are possible without departing from the spirit and scope of the present invention, and such changes and improvements fall within the scope of the invention as claimed.

Claims

1. A green, low-carbon, and non-hazardous industrial wastewater zero-emission organic matter treatment device, characterized by: Including ozone preparation system, micro-nano bubbler, oxidation reactor; The water inlet of the oxidation reactor is connected to the wastewater pipeline; The micro-nano bubbler includes a water source inlet and an air source inlet, the water source inlet is connected to the middle and upper part of the oxidation reactor, and the air source inlet is connected to the ozone preparation system; A micro-nano bubble ejector is provided in the oxidation reactor and is connected to an outlet of the micro-nano bubbler.

2. The green, low-carbon, non-hazardous waste, zero-emission organic matter treatment device for industrial wastewater according to claim 1 is characterized by: The ozone preparation system includes an ozone generator and an oxygen source connected to the ozone generator; the ozone generator is connected to a chiller; The ozone generator is connected to the gas source inlet of the micro-nano bubbler.

3. The green, low-carbon, non-hazardous waste, zero-emission organic matter treatment device for industrial wastewater according to claim 2, characterized in that: The oxygen source is high-purity oxygen purchased from outside.

4. The green, low-carbon, non-hazardous waste, zero-emission organic matter treatment device for industrial wastewater according to claim 2, characterized in that: The oxygen source comes from an oxygen concentrator, and the oxygen concentrator is sequentially connected to an air compressor, a filter and a dryer.

5. The green, low-carbon, non-hazardous waste, zero-emission organic matter treatment device for industrial wastewater according to claim 1, characterized in that: A circulation pump is provided on the pipeline between the oxidation reactor and the water source inlet of the micro-nano bubbler.

6. The green, low-carbon, non-hazardous waste, zero-emission organic matter treatment device for industrial wastewater according to claim 1, characterized in that: The wastewater treatment device further comprises an ozone residual gas treatment system, and the ozone residual gas treatment system is connected to the top of the oxidation reactor.

7. The green, low-carbon, non-hazardous waste, zero-emission organic matter treatment device for industrial wastewater according to claim 6, characterized in that: The ozone residual gas treatment system includes an ozone residual gas destroyer and an exhaust fan which are sequentially connected to the oxidation reactor.

8. The green, low-carbon, non-hazardous waste, zero-emission organic matter treatment device for industrial wastewater according to claim 1, characterized in that: A pH dosing system and a pH sensor are sequentially arranged on the pipeline between the oxidation reactor and the micro-nano bubbler.

9. The green, low-carbon, non-hazardous waste, zero-emission organic matter treatment device for industrial wastewater according to claim 1, characterized in that: The oxidation reactor is provided with a breathing valve, a pressure sensor, a temperature sensor and a liquid level sensor.

10. A wastewater treatment process, using the green, low-carbon, non-hazardous waste, zero-emission organic matter treatment device for industrial wastewater according to any one of claims 1 to 9, characterized in that: The steps include: (1) The wastewater pipeline valve is opened and the wastewater to be treated is injected into the oxidation reactor to the appropriate liquid level; (2) starting the ozone preparation system to prepare ozone; (3) The wastewater to be treated and the ozone in the oxidation reactor are sent into the micro-nano bubbler together to produce a water flow containing high-concentration ozone micro-nano bubbles, which is then sent into the oxidation reactor; (4) The micro-nano bubble ejector evenly ejects water containing high-concentration ozone micro-nano bubbles into the oxidation reactor, where the ozone molecules fully contact the wastewater and disinfect it and degrade organic matter; (5) After disinfection and organic matter degradation are completed, the water outlet of the oxidation reactor is opened to discharge the treated wastewater.

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