CN114180746A - Acidic wastewater treatment system and treatment method - Google Patents
Acidic wastewater treatment system and treatment method Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
- C02F1/32—Treatment of water, waste water, or sewage by irradiation with ultraviolet light
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/722—Oxidation by peroxides
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/76—Treatment of water, waste water, or sewage by oxidation with halogens or compounds of halogens
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/78—Treatment of water, waste water, or sewage by oxidation with ozone
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/34—Organic compounds containing oxygen
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/10—Photocatalysts
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Abstract
The invention discloses an acidic wastewater treatment system and a treatment method, wherein the acidic wastewater treatment system comprises an ozone micro-nano bubble generating device, a micro-nano bubble reaction tower and a dosing device; the ozone micro-nano bubble generating device is connected with the micro-nano bubble reaction tower and is connected with a water inlet pipeline for supplying acid wastewater; the first medicine outlet end of the medicine adding device is connected with the water inlet pipeline and used for adding a pH regulator into the water inlet pipeline, and the second medicine outlet end of the medicine adding device is connected with the micro-nano bubble reaction tower and used for adding an active medicament into the micro-nano bubble reaction tower. According to the invention, the pH regulator is added into the acidic wastewater to convert the acidic wastewater into neutral alkali, and then the acidic wastewater is introduced into the ozone micro-nano bubble generating device and the micro-nano bubble reaction tower, and the active agent is introduced into the micro-nano bubble reaction tower, so that the acidic wastewater is fully treated under the action of the ozone micro-nano bubbles and the active agent, and the utilization rate of ozone is greatly improved.
Description
Technical Field
The invention belongs to the technical field of water treatment equipment, and particularly relates to an acidic wastewater treatment system and a treatment method.
Background
In the field of industrial water treatment containing refractory organic matters, an ozone oxidation technology is representative in a plurality of advanced treatment technologies, ozone not only can rapidly decompose organic matters containing unsaturated bonds by means of strong oxidizing property of the ozone, but also can be converted into active oxygen free radicals with stronger activity and non-selectivity on the organic matters, and the organic matters are thoroughly removed. However, in practical application, the utilization rate of the ozone is only 55-65%. This value is also a major compromise for acidic waste water.
A large amount of ozone which is not effectively utilized reduces the wastewater treatment efficiency on the one hand, and on the other hand, an additional tail gas breaking device is needed, so that the energy consumption is increased.
Therefore, the improvement of the ozone utilization rate is a difficult problem to be solved urgently in the current technology.
In addition, because present ozone advanced treatment unit adopts the bubbling aeration mode, in order to promote ozone mass transfer efficiency, must increase contact reaction tower quantity to lead to the processing apparatus volume great, integrate the degree low, the fluidization operation of being not convenient for, it is inconvenient to use, greatly influences the application and popularization of ozone oxidation technique.
In view of the above, the present invention is particularly proposed.
Disclosure of Invention
The technical problem to be solved by the invention is to overcome the defects of the prior art and provide an acidic wastewater treatment system, wherein the pH value of acidic wastewater is adjusted in a water inlet pipeline for introducing the acidic wastewater into an ozone micro-nano bubble generating device, and an active agent is added into a micro-nano bubble reaction tower, so that the utilization rate of ozone is improved.
The invention also aims to provide an acid wastewater treatment method, which is used for treating acid wastewater by using an ozone micro-nano bubble method and improving the utilization rate of ozone.
The invention also aims to provide an acid wastewater treatment method, which is used for treating acid wastewater by using an ozone micro-nano bubble coordinated ultraviolet catalysis method, so that the acid wastewater treatment efficiency and the ozone utilization rate are improved.
In order to solve the technical problems, the invention adopts the technical scheme that:
an acidic wastewater treatment system comprises an ozone micro-nano bubble generating device, a micro-nano bubble reaction tower and a dosing device;
the ozone micro-nano bubble generating device is connected with the micro-nano bubble reaction tower and is connected with a water inlet pipeline for supplying acid wastewater;
the first medicine outlet end of the medicine adding device is connected with the water inlet pipeline and used for adding a pH regulator into the water inlet pipeline, and the second medicine outlet end of the medicine adding device is connected with the micro-nano bubble reaction tower and used for adding an active medicament into the micro-nano bubble reaction tower.
Further, the medicine adding device comprises
The acquisition unit is connected with the water inlet pipeline and is used for acquiring the pH value and the flow of the acidic wastewater in the water inlet pipeline;
the first adding unit and the second adding unit are respectively connected with the water inlet pipeline and the micro-nano bubble reaction tower;
and the control unit is connected with the acquisition unit, the first adding unit and the second adding unit and is used for controlling the adding amount of the pH regulator added by the first adding unit and the adding amount of the active medicament added by the second adding unit according to the pH value and the flow of the acidic wastewater.
Further, the medicine adding device also comprises
The first storage unit is connected with the first adding unit and used for storing a pH regulator;
and the second storage unit is connected with the second adding unit and is used for storing active medicaments.
Further, the ozone micro-nano bubble generating device comprises a primary air dissolving device and a secondary air dissolving device which are connected with each other and used for generating the ozone micro-nano bubbles,
the primary air dissolving device is connected with the water inlet pipeline, and the secondary air dissolving device is connected with the micro-nano bubble reaction tower.
Further, the primary air dissolving device comprises an ozone generator and an air-liquid mixing pump;
a first inlet of the gas-liquid mixing pump is connected with the ozone generator, a second inlet of the gas-liquid mixing pump is used for being connected with a water inlet pipeline, an outlet of the gas-liquid mixing pump is connected with an inlet of the secondary gas dissolving device, and an outlet of the secondary gas dissolving device is connected with a first inlet of the micro-nano bubble reaction tower;
preferably, the secondary air dissolving device comprises a cyclone type air bubble mixer.
Further, the device also comprises an ultraviolet catalyst reaction tower, wherein a first outlet of the micro-nano bubble reaction tower is connected with a first inlet of the ultraviolet catalyst reaction tower;
a plurality of ultraviolet generators and catalyst packed beds are arranged in the ultraviolet catalyst reaction tower at intervals.
Further, a second inlet of the micro-nano bubble reaction tower and a second inlet of the ultraviolet catalyst reaction tower are respectively connected with the water inlet pipeline;
and a first outlet of the ultraviolet catalyst reaction tower is connected with the ozone micro-nano bubble generating device.
The acid wastewater treatment method comprises the following steps
S1, introducing the acidic wastewater to be treated into an ozone micro-nano bubble generating device;
s2, generating a gas-liquid mixed solution containing ozone microbubbles in the ozone micro-nano bubble generating device;
s3, introducing the gas-liquid mixed liquid generated in the step S2 into a micro-nano bubble reaction tower for oxidation reaction;
step S1 comprises the steps of collecting the pH value and flow of the introduced acidic wastewater, adding a pH regulator in the process of introducing the ozone micro-nano bubble generating device according to the collected pH value, and regulating the pH value of the acidic wastewater to a set value;
and step S3, active agents are put into the micro-nano bubble reaction tower according to the collected flow.
Further, the method also comprises the following steps
And S4, introducing the wastewater after the oxidation reaction in the step S3 into an ultraviolet catalyst reaction tower, and treating the wastewater by utilizing the synergistic action of ozone, ultraviolet rays and a catalyst.
The acid wastewater treatment method comprises the following steps
S1, respectively introducing the acidic wastewater to be treated into a micro-nano bubble reaction tower and an ultraviolet catalyst reaction tower, and stopping introducing the acidic wastewater when the water amount in the micro-nano bubble reaction tower and the ultraviolet catalyst reaction tower exceeds a set water amount;
s2, when wastewater in the ultraviolet catalyst reaction tower is led into the ozone micro-nano bubble generating device, the wastewater in the micro-nano bubble reaction tower is supplemented into the ultraviolet catalyst reaction tower, so that the wastewater in the micro-nano bubble reaction tower and the ultraviolet catalyst reaction tower is circularly treated between the ozone micro-nano bubble generating device, the micro-nano bubble reaction tower and the ultraviolet catalyst reaction tower;
and step S1, collecting the pH value and flow rate of the introduced acidic wastewater, adding a pH regulator into the pipeline leading into the micro-nano bubble reaction tower and the ultraviolet catalyst reaction tower according to the collected pH value and flow rate, and adding an active medicament into the micro-nano bubble reaction tower and/or the ultraviolet catalyst reaction tower.
After the technical scheme is adopted, compared with the prior art, the invention has the following beneficial effects.
1. According to the invention, the pH regulator is added into the acidic wastewater to convert the acidic wastewater into neutral alkali, and then the acidic wastewater is introduced into the ozone micro-nano bubble generating device and the micro-nano bubble reaction tower, and the active agent is introduced into the micro-nano bubble reaction tower, so that the acidic wastewater is fully treated under the action of the ozone micro-nano bubbles and the active agent, and the utilization rate of ozone is greatly improved.
2. The acid wastewater treatment system can meet the requirements of acid wastewater treatment in different modes of continuous mode and continuous batch mode, and greatly improves the application range of the acid wastewater treatment system.
3. According to the invention, the gas-liquid mixing pump and the spiral-flow type micro-nano bubble generator are adopted to cooperate, and ozone micro-nano bubbles with smaller sizes are generated under the actions of pressurized gas dissolving, reduced pressure gas releasing and spiral-flow shearing, so that the treatment effect of the wastewater is further improved.
4. The process of adjusting the pH value of the acidic wastewater is a mode of 'introducing and adjusting' into the ozone micro-nano bubble generating device, so that the space is saved, and an additional adjusting tank is not needed; the corrosion of the acidic wastewater to the container pipeline is reduced; flexible regulation and control of metering; the regulation and control timeliness avoids the problems that after the alkalinity is regulated and controlled at one time, the pH value is reduced due to the absorption of carbon dioxide in the air, the treatment efficiency is reduced, and the waste of the pH regulator is caused.
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention, are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without limiting the invention to the right. It is obvious that the drawings in the following description are only some embodiments, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. In the drawings:
FIG. 1 is a schematic view showing the construction of a wastewater treatment system according to the present invention;
FIG. 2 is a schematic view of the structure of the drug adding device of the present invention;
in the figure: 1. a reservoir; 2. a water lifting pump; 3. a flow meter; 4. a first check valve; 5. an ozone generator; 6. a second one-way valve; 7. a gas-liquid mixing pump; 8. a secondary air dissolving device; 9. a first valve; 10. a second valve; 11. a micro-nano bubble reaction tower; 12. a water delivery pipe; 13. an ultraviolet catalyst reaction tower; 14. an ultraviolet lamp set; 15. a packed bed of catalyst; 16. filling the window; 17. a first drain valve; 18. a second drain valve; 19. a third drain valve; 20. a fourth drain valve; 21. a third valve; 22. a third check valve; 23. a fourth check valve; 24. a dosing device; 25. a flow sensor; 26. a pH value monitoring probe; 27. a pH regulator feeding pipe; 28. a control unit; 29. a first adding unit; 30. a first storage unit; 31. a second storage unit; 32. a second adding unit; 33. an active agent feeding pipe.
It should be noted that the drawings and the description are not intended to limit the scope of the inventive concept in any way, but to illustrate it by a person skilled in the art with reference to specific embodiments.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and the following embodiments are used for illustrating the present invention and are not intended to limit the scope of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred devices or elements must have specific orientations, be constructed in specific orientations, and be operated, and thus, should not be construed as limiting the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The invention provides an acidic wastewater treatment system and a treatment method. As shown in fig. 1 and fig. 2, the structure of the acidic wastewater treatment system is schematically illustrated, and the acidic wastewater treatment system includes an ozone micro-nano bubble generating device, a micro-nano bubble reaction tower 11 and a dosing device 24.
As shown in fig. 1, the ozone micro-nano bubble generating device is connected with the micro-nano bubble reaction tower 11, and ozone micro-nano bubbles generated by the ozone micro-nano bubble generating device are introduced into the micro-nano bubble reaction tower 11. The ozone micro-nano bubble generating device is connected with a water inlet pipeline for supplying acid wastewater; the water inlet pipeline is connected with the source of the acidic wastewater.
The first medicine outlet end of the medicine adding device 24 is connected with the water inlet pipeline and used for adding a pH regulator into the water inlet pipeline, and the second medicine outlet end of the medicine adding device is connected with the micro-nano bubble reaction tower and used for adding an active medicament into the micro-nano bubble reaction tower 11.
In detail, a proper amount of pH regulator is added into the acidic wastewater in a water inlet pipeline of the ozone micro-nano bubble generating device through the medicine adding device 24, the pH value of the acidic wastewater is regulated to a set value, and the pH value of the regulated wastewater ranges from 7 to 10, so that the acidic wastewater is converted into the medium-alkaline wastewater.
After the alkalescent wastewater is introduced into the ozone micro-nano bubble generating device, a gas-liquid mixed solution containing ozone micro-nano bubbles is formed in the ozone micro-nano bubble generating device, the gas-liquid mixed solution is introduced into the micro-nano bubble reaction tower 11 to generate an oxidation reaction, and the dosing device 24 adds an active agent into the micro-nano bubble reaction tower 11.
To further illustrate that the acid wastewater treatment system of the present invention can greatly improve the ozone utilization rate, the following four acetic acid wastewater treatment methods were compared, and finally the acid wastewater treatment efficiency and the ozone utilization rate were compared, and the results are shown in table 1.
(1) No medicine is added;
(2) only adding a pH regulator;
(3) only adding active agents;
(4) adding a pH regulator and an active agent.
TABLE 1 statistical table of wastewater treatment efficiency of different chemical feeding devices
As can be seen from Table 1, the COD removal rate for acetic acid wastewater with initial COD of 400mg/L is only 22% for the treatment method (1), because the acid wastewater is not favorable for ozone treatment. For the treatment modes of the (2) th treatment mode and the (3) rd treatment mode, the COD removal rate is respectively improved to 66 percent and 37 percent, and the treatment efficiency without adding chemicals is obviously improved. For the treatment mode (4), when a pH regulator and an active agent are added, the COD removal efficiency is further improved to 78%, and the ozone utilization rate reaches 99%. The combined use of the pH regulator and the active agent dosing device is demonstrated, so that the acidic wastewater fully reacts under the dual actions of the ozone micro-nano bubbles and the active agent, the utilization rate of ozone is improved, and the treatment efficiency of the acidic wastewater is finally improved.
In some embodiments of the invention, the pH adjusting agent is any one of sodium hydroxide, sodium carbonate or lime, or any combination thereof. The active medicament is any one or any combination of hydrogen peroxide, hypochlorous acid, perchloric acid or chlorine dioxide.
In a further scheme, the acidic wastewater treatment system further comprises an ultraviolet catalyst reaction tower 13, and a first outlet of the micro-nano bubble reaction tower 11 is connected with a first inlet of the ultraviolet catalyst reaction tower 13. A plurality of ultraviolet lamp groups 14 and catalyst packed beds 15 are arranged at intervals in the ultraviolet catalyst reaction tower 13.
In the scheme, if the active medicament is hydrogen peroxide, on one hand, acidic wastewater is changed into medium-alkaline wastewater through the pH regulator, so that the solubility of ozone and the reaction rate of ozone and OH & lt- & gt are improved; on the other hand, hydrogen peroxide and ozone micro-nano bubbles can improve the pretreatment efficiency in the micro-nano bubble reaction tower 11, and can also synergistically improve the generation rate of active oxygen free radicals under the action of an ultraviolet lamp and a catalyst in an ultraviolet catalyst reaction tower 13, so that the treatment efficiency of the acidic wastewater is finally and obviously improved.
Preferably, the ultraviolet generator includes an ultraviolet lamp bank 14.
In detail, the ultraviolet catalyst reaction tower 13 is composed of an ultraviolet lamp group 14 and a catalyst packed bed 15 which are arranged at intervals in an overlapping way, and the ultraviolet catalyst reaction tower 13 is simultaneously provided with a high-grade synergistic oxidation treatment process of photocatalysis ozonization and heterogeneous catalysis ozonization.
Specifically, the effect of the uv catalyst reaction tower 13 of the present invention on wastewater treatment compared to the uv lamp set 14 alone, the catalyst alone, and the uv lamp set 14 and catalyst mixed arrangement is shown in table 2.
TABLE 2 statistical table of wastewater treatment effects of different treatment devices
In Table 2, experiments were conducted using wastewater with an initial COD of 350mg/L, and it can be seen that the COD residual amounts of the single ultraviolet device and the single catalyst packed bed 15 device within 1.5h were high, respectively 212.5mg/L and 176.8mg/L, and after mixing the two, the COD residual amount could be reduced to 126.2mg/L, while the COD residual amount could be further reduced to 83.6mg/L and reached the effluent standard.
In the above scheme, the power range of the ultraviolet lamp set 14 is 150W-400W.
Preferably, the catalyst in the catalyst packed bed 15 is a multi-transition metal catalyst or a noble metal-transition metal composite catalyst, the transition metal includes iron, manganese, cobalt, nickel, copper, etc., and the noble metal includes ruthenium, platinum, etc.
Preferably, the ultraviolet catalyst reaction tower 13 is provided with a filling window 16 for filling the catalyst and simultaneously used as an observation window for observing the mixing effect in the tower.
In some embodiments of the present invention, as shown in fig. 2, the dosing device 24 includes a collection unit, a first dosing unit 29, a second dosing unit 32, and a control unit 28.
The acquisition unit is connected with the water inlet pipeline and is used for acquiring the pH value and the flow of the acidic wastewater in the water inlet pipeline.
And the first adding unit 29 and the second adding unit 32 are respectively connected with the water inlet pipeline and the micro-nano bubble reaction tower 11.
The control unit 28 is connected to the acquisition unit, the first adding unit 29 and the second adding unit 32, and is configured to control the adding amount of the pH regulator added by the first adding unit 29 and the adding amount of the active agent added by the second adding unit 32 according to the pH value and the flow rate of the acidic wastewater.
Preferably, the dosing device 24 further comprises a first storage unit 30 and a second storage unit 31, and the first storage unit 30 is connected with the first adding unit 29 and is used for storing a pH regulator; the second storage unit 31 is connected with the second dosing unit 32 and is used for storing active pharmaceutical agents.
In detail, the first adding unit 29 is connected with the water inlet pipeline through a pH regulator adding pipe 27, and the second adding unit 32 is connected with the micro-nano bubble reaction tower 11 through an active agent adding pipe 33.
The collecting unit is connected with the water inlet pipeline and is used for collecting the real-time pH value and flow of the acidic wastewater and providing a basis for adding a pH regulator and an active medicament.
In the scheme, the process of adjusting the pH value of the acidic wastewater is a mode of 'introducing and adjusting while' into the ozone micro-nano bubble generating device, and compared with the prior art that the acidic wastewater is adjusted to the required pH value and then is treated, the method has the following advantages:
(1) the space is saved, and an additional regulating tank is not needed, so that the volume of the wastewater treatment system is reduced, the integration degree is higher, the mobile operation is convenient, and the use is convenient;
(2) the corrosion of the acidic wastewater to the container pipeline is reduced;
(3) the metering can be flexibly regulated and controlled;
(4) the regulation and control timeliness avoids the reduction of pH caused by the reduction of pH due to the absorption of carbon dioxide in air after the one-time regulation and control to alkalinity, and the waste of a pH regulator.
Preferably, the collection unit includes a pH monitoring probe 26 for collecting pH and a flow sensor 25 for collecting flow.
In a further scheme, the ozone micro-nano bubble generating device comprises a primary air dissolving device and a secondary air dissolving device 8 which are connected with each other and used for generating ozone micro-nano bubbles, wherein the primary air dissolving device is connected with the water inlet pipeline, and the secondary air dissolving device 8 is connected with the micro-nano bubble reaction tower 11.
In detail, the primary gas dissolving device is used for carrying out primary gas dissolving on ozone gas and wastewater;
the secondary air dissolving device 8 is used for carrying out secondary air dissolving on the ozone gas and the wastewater.
According to the scheme, after ozone and wastewater are subjected to a primary gas dissolving process and a secondary gas dissolving process, the size of micro-nano bubbles in the wastewater is obviously reduced, the stability of the micro-nano bubbles in the water is enhanced, the annihilation time of the micro-nano bubbles is greatly prolonged, ozone mass transfer and dissolution are facilitated, the ozone utilization rate can be greatly improved, and the wastewater treatment effect is further improved.
Further, the primary air dissolving device comprises an ozone generator 5 and an air-liquid mixing pump 7.
The first inlet of the gas-liquid mixing pump 7 is connected with the ozone generator 5, and a second one-way valve 6 is arranged on the connecting pipeline. And a second inlet of the gas-liquid mixing pump 7 is used for being connected with a water inlet pipeline, and a first one-way valve 4 is arranged on the connecting pipeline. An outlet of the gas-liquid mixing pump 7 is connected with an inlet of the secondary gas dissolving device 8, an outlet of the secondary gas dissolving device 8 is connected with a first inlet of the micro-nano bubble reaction tower 11, and a first valve 9 is arranged on a connecting pipeline.
Preferably, the first inlet of the micro-nano bubble reaction tower 11 is arranged at a position close to the bottom end, so that the ozone micro-nano bubble mixed liquid generated by the secondary air dissolving device 8 enters the micro-nano bubble reaction tower 11 from bottom to top, the retention time of the ozone micro-nano bubbles in wastewater is increased, the interaction between the ozone micro-nano bubbles and the active medicament is improved, and the oxidation effect is enhanced.
The secondary air dissolving device 8 comprises a spiral-flow type bubble mixer which can provide shearing force and generate ozone micro-nano bubbles with smaller scale. Namely, the ozone micro-nano bubbles are generated by the synergistic effect of pressurized dissolved air decompression and gas-liquid rotational flow, the size of the ozone micro-nano bubbles is obviously reduced, and the ozone micro-nano bubbles are more uniform.
In order to further illustrate the beneficial effects of the ozone micro-nano bubbles, three ozone micro-nano bubble generation modes are compared, and 1) the ozone micro-nano bubbles are independently generated by a gas-liquid mixing pump 7; 2) produced by the secondary air dissolving device 8; 3) the ozone bubbles generated by the cooperative action of the gas-liquid mixing pump 7 and the secondary air dissolving device 8 were measured for size and annihilation time parameters, and the results are shown in table 3.
TABLE 3 statistics of bubble parameters generated by different generators
As can be seen from Table 3, the size of the bubbles generated by the gas-liquid mixing pump 7 is in the range of 250-550nm, the size of the bubbles generated by the secondary gas dissolving device 8 is in the range of 100-450nm, and the size of the bubbles generated by the combined action of the two is in the range of 10-300nm, which is obviously reduced. Further, the bubble annihilation time by the gas-liquid mixing pump 7 was 240s, the bubble annihilation time by the secondary gas dissolving device 8 was 440s, and the bubble annihilation time by the combined action of both was 600s, which indicates that the bubble stability was significantly enhanced.
Therefore, the ozone micro-nano bubbles are generated by combining the micro-nano bubble mixing pump and the secondary air dissolving device 8, the bubbles are small in size and high in stability, ozone mass transfer and dissolution are facilitated, and the ozone utilization rate can be greatly improved.
For example, when the acidic wastewater treatment system of the present invention is used for treating acetic acid wastewater, the pH of the acetic acid wastewater ranges from 2 to 3. Acetic acid wastewater enters a water inlet pipeline through a water lifting pump 2, a flow sensor 25 monitors the flow of the acetic acid wastewater, a pH value monitoring probe 26 measures the pH value of the acetic acid wastewater, the flow and the pH value are fed back to a control unit 28, and the control unit 28 controls a first adding unit 29 to add a proper amount of pH regulator into the water inlet pipeline from a first storage unit 30 to regulate the pH value of the acetic acid wastewater to about 8.5.
The adjusted wastewater enters a gas-liquid mixing pump 7, and ozone generated by the ozone generator 5 enters the gas-liquid mixing pump 7 through a second one-way valve 6. The waste water and the ozone are mixed in the gas-liquid mixing pump 7 to generate gas-liquid mixed liquid containing large-size uneven ozone micro-nano bubbles, then the gas-liquid mixed liquid enters the spiral-flow type bubble mixer, the gas-liquid mixed liquid containing small-size even ozone micro-nano bubbles is generated under the shearing action of the spiral flow, and then the gas-liquid mixed liquid enters the micro-nano bubble reaction tower 11.
The control unit 28 controls the second adding unit 32 to add a proper amount of active medicament into the micro-nano bubble reaction tower 11 from the second storage unit 31 according to the flow data obtained by the flow sensor 25. The active agent used may be hydrogen peroxide.
After wastewater in the micro-nano bubble reaction tower 11 is fully pretreated under the action of ozone micro-nano bubbles and hydrogen peroxide, the wastewater containing the ozone micro-nano bubbles and the hydrogen peroxide enters an ultraviolet catalyst reaction tower 13 from bottom to top along a water delivery pipe 12, and the ozone and the hydrogen peroxide carry out advanced treatment on the wastewater under the action of ultraviolet light and a catalyst. The treated wastewater is discharged through a first drain valve 17, and continuous treatment is realized.
Preferably, the ozone amount added by the ozone generator 5 is 70-280 g/h.
Preferably, the speed of the wastewater entering the micro-nano bubble gas-liquid mixing pump 7 is 0.5-1.3m3/h。
In some embodiments of the present invention, the second inlet of the micro-nano bubble reaction tower 11 and the second inlet of the ultraviolet catalyst reaction tower 13 are respectively used for connecting with a water inlet pipe. A third one-way valve 22 is arranged on a connecting pipeline between a second inlet of the micro-nano bubble reaction tower 11 and a water inlet pipeline; and a fourth one-way valve 23 is arranged on a connecting pipeline between the second inlet of the ultraviolet catalyst reaction tower 13 and the water inlet pipeline.
A first outlet of the ultraviolet catalyst reaction tower 13 is connected with a second inlet of the gas-liquid mixing pump 7, and a second valve 10 is arranged on a connecting pipeline. And a second outlet of the ultraviolet catalyst reaction tower 13 is connected with a water drainage pipeline, and a first water drainage valve 17 is arranged on the water drainage pipeline.
And the bottoms of the secondary gas dissolving device 8, the micro-nano bubble reaction tower 11 and the ultraviolet catalyst reaction tower 13 are respectively provided with a second drain valve 18, a third drain valve 19 and a fourth drain valve 20, and the second drain valves are used for discharging wastewater of the secondary gas dissolving device 8, the micro-nano bubble reaction tower 11 and the ultraviolet catalyst reaction tower 13 after being opened.
Specifically, the wastewater treatment system can adopt two working modes of a continuous mode and a continuous batch mode, and selects a proper treatment mode according to the quality of acid wastewater and the discharge index to meet different treatment requirements.
In detail, the continuous working mode is that the acidic wastewater in the reservoir 1 enters the gas-liquid mixing pump 7 through the water lifting pump 2 according to a certain flow rate through the water inlet pipeline, and the flow rate can be controlled by the flow meter 3 arranged on the pipeline. In the water inlet pipeline, a collecting unit collects the pH value and the flow of the acidic wastewater. The control unit 28 of the dosing device 24 controls the first adding unit 29 to add the pH regulator into the water inlet pipeline according to the collected pH value, so that the acidic wastewater is converted into the medium-alkaline wastewater and then enters the gas-liquid mixing pump 7. Ozone generated by the ozone generator 5 enters the gas-liquid mixing pump 7 through the second one-way valve 6. The medium-alkaline wastewater and the ozone are mixed in the gas-liquid mixing pump 7 to generate gas-liquid mixed liquid containing large-size uneven ozone micro-nano bubbles, then the gas-liquid mixed liquid enters the secondary gas dissolving device 8, the gas-liquid mixed liquid containing small-size even ozone micro-nano bubbles is generated under the shearing action of rotational flow, and then the gas-liquid mixed liquid enters the micro-nano bubble reaction tower 11. The control unit 28 of the dosing device 24 controls the second dosing unit 32 to dose the active agent into the micro-nano bubble reaction tower 11 according to the flow rate of the collected acidic wastewater. After wastewater in the tower is fully pretreated under the action of ozone micro-nano bubbles and an active agent, the wastewater containing the ozone micro-nano bubbles enters an ultraviolet catalyst reaction tower 13 from bottom to top along a water delivery pipe 12, and the ozone carries out advanced treatment on the wastewater under the action of ultraviolet light and a catalyst. The treated wastewater is discharged through a first drain valve 17, and continuous treatment is realized. If the wastewater treatment does not reach the standard, the water lifting pump 2 is closed, the second valve 10 is opened, the ultraviolet catalyst reaction tower 13 is communicated with the gas-liquid mixing pump 7, and the wastewater in the tower enters the gas-liquid mixing pump 7 and the secondary gas dissolving device 8 again in sequence for cyclic treatment until the discharge requirement is met.
In detail, the continuous batch type working mode is that the first one-way valve 4 is closed, and the acidic wastewater enters the micro-nano bubble reaction tower 11 and the ultraviolet catalyst reaction tower 13 through the water inlet pipeline and the third one-way valve 22 and the fourth one-way valve 23 after passing through the water lifting pump 2. In the water inlet pipeline, a collecting unit collects the pH value and the flow of the acidic wastewater. The control unit 28 of the dosing device 24 controls the first adding unit 29 to add the pH regulator into the water inlet pipeline according to the collected pH value, so that the acidic wastewater is converted into the medium-alkaline wastewater and then enters the micro-nano bubble reaction tower 11 and the ultraviolet catalyst reaction tower 13. In the process that the medium-alkali wastewater enters the micro-nano bubble reaction tower 11 and the ultraviolet catalyst reaction tower 13, the control unit 28 of the dosing device 24 controls the second dosing unit 32 to dose the active agent into the micro-nano bubble reaction tower 11 and/or the ultraviolet catalyst reaction tower 13 according to the flow of the collected acidic wastewater. After a certain amount of water is reached, the amount of water can be controlled by the flowmeter 3, the third check valve 22 and the fourth check valve 23 are closed, the second valve 10 is opened, and meanwhile, the control unit 28 controls the first adding unit 29 to stop adding the pH regulator. The wastewater is pumped into the gas-liquid mixing pump 7 from the ultraviolet catalyst reaction tower 13, then is mixed with ozone to generate a gas-liquid mixed solution containing large-size ozone micro-nano bubbles, and then enters the secondary gas dissolving device 8, and the gas-liquid mixed solution containing small-size ozone micro-nano bubbles enters the micro-nano bubble reaction tower 11. After wastewater in the tower is fully pretreated by ozone, a wastewater water delivery pipe 12 containing ozone micro-nano bubbles enters an ultraviolet catalyst reaction tower 13 from bottom to top, the ozone carries out advanced treatment on the wastewater under the action of ultraviolet light and a catalyst, and the wastewater is circularly treated between a gas-liquid mixing pump 7, a secondary gas dissolving device 8, a micro-nano bubble reaction tower 11 and the ultraviolet catalyst reaction tower 13 until the discharge requirement is met. During the period, the control unit 28 controls the second adding unit 32 to continuously add the active agent into the micro-nano bubble reaction tower 11 and/or the ultraviolet catalyst reaction tower 13. Finally, the wastewater is discharged through a second water discharge valve 18, a third water discharge valve 19 and a fourth water discharge valve 20, so that continuous batch treatment is realized. It is understood that the ozone generator 5 adjusts the supply amount of ozone as needed.
In addition, the micro-nano bubble reaction tower 11 is connected with a second inlet of the gas-liquid mixing pump 7, and a third valve 21 is arranged on a connecting pipeline. Then, when the COD content in the wastewater to be treated is less, only the ozone micro-nano bubbles are needed to obtain a better treatment effect.
In the above embodiment, the reservoir 1 is only used to illustrate the source of the acidic wastewater, and the reservoir 1 is not necessarily required to be provided in the acidic wastewater treatment system of the present invention.
The acid wastewater treatment system has good wastewater treatment effect, can realize integrated and vehicle-mounted operation, and has the wastewater treatment capacity of 0.5m3-2.5m3/h。
The invention also provides an acidic wastewater treatment method, which comprises the following steps:
s1, introducing the acidic wastewater to be treated into an ozone micro-nano bubble generating device;
s2, generating a gas-liquid mixed solution containing ozone microbubbles in the ozone micro-nano bubble generating device;
s3, the gas-liquid mixture generated in step S2 is introduced into the micro-nano bubble reaction tower 11 to perform an oxidation reaction.
Step S1 comprises the steps of collecting the pH value and flow of the introduced acidic wastewater, adding a pH regulator in the process of introducing the ozone micro-nano bubble generating device according to the collected pH value, and regulating the pH value of the acidic wastewater to a set value;
step S3 includes adding an active agent into the micro-nano bubble reaction tower 11 according to the collected flow rate.
In detail, taking the above acidic wastewater treatment device as an example, the acidic wastewater in the reservoir 1 enters the gas-liquid mixing pump 7 through the water intake pipe via the water lift pump 2 at a certain flow rate, and the flow rate can be controlled by the flow meter 3 arranged on the pipeline.
In the water inlet pipeline, a collecting unit collects the pH value and the flow of the acidic wastewater. The control unit 28 of the dosing device 24 controls the first adding unit 29 to add the pH regulator into the water inlet pipeline according to the collected pH value, so that the acidic wastewater is converted into the medium-alkaline wastewater and then enters the gas-liquid mixing pump 7.
Ozone generated by the ozone generator 5 enters the gas-liquid mixing pump 7 through the second one-way valve 6. The medium-alkaline wastewater and the ozone are mixed in the gas-liquid mixing pump 7 to generate gas-liquid mixed liquid containing large-size uneven ozone micro-nano bubbles, then the gas-liquid mixed liquid enters the secondary gas dissolving device 8, the gas-liquid mixed liquid containing small-size even ozone micro-nano bubbles is generated under the shearing action of rotational flow, and then the gas-liquid mixed liquid enters the micro-nano bubble reaction tower 11.
The control unit 28 of the dosing device 24 controls the second dosing unit 32 to dose the active agent into the micro-nano bubble reaction tower 11 according to the flow rate of the collected acidic wastewater. After wastewater in the tower is fully pretreated under the action of ozone micro-nano bubbles and an active agent, the wastewater containing the ozone micro-nano bubbles enters an ultraviolet catalyst reaction tower 13 from bottom to top along a water delivery pipe 12, and the ozone carries out advanced treatment on the wastewater under the action of ultraviolet light and a catalyst. The treated wastewater is discharged through a first drain valve 17, and continuous treatment is realized.
If the wastewater treatment does not reach the standard, the water lifting pump 2 is closed, the second valve 10 is opened, the ultraviolet catalyst reaction tower 13 is communicated with the gas-liquid mixing pump 7, and the wastewater in the tower enters the ozone micro-nano bubble generating device and the secondary gas dissolving device 8 again in sequence for cyclic treatment until the discharge requirement is met.
Further, the method for treating the acidic wastewater also comprises the following steps
S4, the wastewater after the oxidation reaction in the step S3 is introduced into an ultraviolet catalyst reaction tower 13, and the wastewater is treated by the synergistic effect of ozone, ultraviolet rays and a catalyst.
Preferably, the wastewater in the micro-nano bubble reaction tower 11 in the step S3 enters the ultraviolet catalyst reaction tower 13 from bottom to top.
In detail, after wastewater is fully treated by ozone and active agents in a micro-nano bubble reaction tower 11, a wastewater water delivery pipe 12 containing ozone micro-nano bubbles enters an ultraviolet catalyst reaction tower 13 from bottom to top, the ozone carries out advanced treatment on the wastewater under the action of ultraviolet light and a catalyst, and the treated wastewater is discharged through a first drain valve 17, so that continuous treatment is realized.
If the wastewater treatment does not reach the standard, the water lifting pump 2 is closed, the second valve 10 is opened, the ultraviolet catalyst reaction tower 13 is communicated with the gas-liquid mixing pump 7, and the wastewater in the tower enters the secondary gas dissolving device 8 again for cyclic treatment until the discharge requirement is met.
The invention also provides an acid wastewater treatment method, which comprises the following steps
S1, respectively introducing the acidic wastewater to be treated into the micro-nano bubble reaction tower 11 and the ultraviolet catalyst reaction tower 13, and stopping introducing the acidic wastewater when the water amount in the micro-nano bubble reaction tower 11 and the ultraviolet catalyst reaction tower 13 exceeds the set water amount;
s2, when wastewater in the ultraviolet catalyst reaction tower 13 is led into the ozone micro-nano bubble generating device, the wastewater in the micro-nano bubble reaction tower 11 is supplemented into the ultraviolet catalyst reaction tower 13, so that the wastewater in the micro-nano bubble reaction tower 11 and the ultraviolet catalyst reaction tower 13 is circularly treated between the ozone micro-nano bubble generating device, the micro-nano bubble reaction tower 11 and the ultraviolet catalyst reaction tower 13;
step S1 includes collecting the pH and flow rate of the introduced acidic wastewater, adding a pH adjusting agent into the pipeline leading into the micro-nano bubble reaction tower 11 and the ultraviolet catalyst reaction tower 13 according to the collected pH and flow rate, and adding an active agent into the micro-nano bubble reaction tower 11 and/or the ultraviolet catalyst reaction tower 13.
In detail, in the introduction process of the acidic wastewater, the collection unit collects the pH value and the flow rate of the acidic wastewater. The control unit 28 of the dosing device 24 controls the first adding unit 29 to add the pH regulator into the water inlet pipeline according to the collected pH value, so that the acidic wastewater is converted into the medium-alkaline wastewater and then enters the micro-nano bubble reaction tower 11 and the ultraviolet catalyst reaction tower 13. In the process that the medium-alkali wastewater enters the micro-nano bubble reaction tower 11 and the ultraviolet catalyst reaction tower 13, the control unit 28 of the dosing device 24 controls the second dosing unit 32 to dose the active agent into the micro-nano bubble reaction tower 11 and/or the ultraviolet catalyst reaction tower 13 according to the flow of the collected acidic wastewater.
After a certain amount of water is reached, the amount of water can be controlled by the flowmeter 3, the third check valve 22 and the fourth check valve 23 are closed, the second valve 10 is opened, and meanwhile, the control unit 28 controls the first adding unit 29 to stop adding the pH regulator.
When wastewater in the ultraviolet catalyst reaction tower 13 is led into the ozone micro-nano bubble generating device and the secondary gas dissolving device 8, the wastewater in the micro-nano bubble reaction tower 11 is supplemented into the ultraviolet catalyst reaction tower 13, so that the wastewater in the micro-nano bubble reaction tower 11 and the ultraviolet catalyst reaction tower 13 is circularly treated among the gas-liquid mixing pump 7, the secondary gas dissolving device 8, the micro-nano bubble reaction tower 11 and the ultraviolet catalyst reaction tower 13.
During the period, the control unit 28 controls the second adding unit 32 to continuously add the active agent into the micro-nano bubble reaction tower 11 and/or the ultraviolet catalyst reaction tower 13.
Preferably, the wastewater in the micro-nano bubble reaction tower 11 in the step S2 enters the ultraviolet catalyst reaction tower 13 from bottom to top.
In detail, when the COD content in the acidic wastewater to be treated is higher or the discharge requirement is higher, the wastewater after continuous treatment may not meet the requirement, therefore, the invention also provides a continuous batch type treatment method, which adopts the continuous batch type treatment method to ensure that the COD content is obviously reduced after the acidic wastewater is repeatedly and circularly treated, and the higher discharge requirement can be met.
Specifically, taking the wastewater treatment apparatus as an example, the continuous batch type operation mode is that the first check valve 4 is closed, and wastewater enters the micro-nano bubble reaction tower 11 and the ultraviolet catalyst reaction tower 13 from the third check valve 22 and the fourth check valve 23 through the water lift pump 2.
In the introduction process of the acidic wastewater, the acquisition unit acquires the pH value and the flow of the acidic wastewater. The control unit 28 of the dosing device 24 controls the first adding unit 29 to add the pH regulator into the water inlet pipeline according to the collected pH value, so that the acidic wastewater is converted into the medium-alkaline wastewater and then enters the micro-nano bubble reaction tower 11 and the ultraviolet catalyst reaction tower 13. In the process that the medium-alkali wastewater enters the micro-nano bubble reaction tower 11 and the ultraviolet catalyst reaction tower 13, the control unit 28 of the dosing device 24 controls the second dosing unit 32 to dose the active agent into the micro-nano bubble reaction tower 11 and/or the ultraviolet catalyst reaction tower 13 according to the flow of the collected acidic wastewater.
When a certain amount of water is obtained in the micro-nano bubble reaction tower 11 and the ultraviolet catalyst reaction tower 13, closing the third one-way valve 22 and the fourth one-way valve 23, opening the second valve 10, pumping the wastewater into the gas-liquid mixing pump 7 from the ultraviolet catalyst reaction tower 13, mixing the wastewater with ozone to generate a gas-liquid mixed solution containing large-size uneven ozone micro-nano bubbles, then feeding the gas-liquid mixed solution into the secondary air dissolving device 8 to generate a gas-liquid mixed solution containing small-size even ozone micro-nano bubbles, feeding the gas-liquid mixed solution into the micro-nano bubble reaction tower 11, fully treating the wastewater in the tower with ozone and an active agent, feeding the wastewater water conveying pipe 12 containing the ozone micro-nano bubbles into the ultraviolet catalyst reaction tower 13 from bottom to top, deeply treating the wastewater with the ozone and the active agent under the action of ultraviolet light and a catalyst, and circularly treating the wastewater between the gas-liquid mixing pump 7, the secondary air dissolving device 8, the micro-nano bubble reaction tower 11 and the ultraviolet catalyst reaction tower 13, and finally, discharging the wastewater through a second water discharge valve 18, a third water discharge valve 19 and a fourth water discharge valve 20 until the discharge requirement is met, so as to realize continuous batch treatment.
It can be understood that the micro-nano bubble reaction tower 11 is connected with the second inlet of the gas-liquid mixing pump 7, and the connecting pipeline is provided with a third valve 21. Then, when the COD content in the wastewater to be treated is less, only the ozone micro-nano bubbles are needed to obtain a better treatment effect.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. An acidic wastewater treatment system, which is characterized in that: comprises an ozone micro-nano bubble generating device, a micro-nano bubble reaction tower and a dosing device;
the ozone micro-nano bubble generating device is connected with the micro-nano bubble reaction tower and is connected with a water inlet pipeline for supplying acid wastewater;
the first medicine outlet end of the medicine adding device is connected with the water inlet pipeline and used for adding a pH regulator into the water inlet pipeline, and the second medicine outlet end of the medicine adding device is connected with the micro-nano bubble reaction tower and used for adding an active medicament into the micro-nano bubble reaction tower.
2. An acidic wastewater treatment system according to claim 1, wherein:
the medicine adding device comprises
The acquisition unit is connected with the water inlet pipeline and is used for acquiring the pH value and the flow of the acidic wastewater in the water inlet pipeline;
the first adding unit and the second adding unit are respectively connected with the water inlet pipeline and the micro-nano bubble reaction tower;
and the control unit is connected with the acquisition unit, the first adding unit and the second adding unit and is used for controlling the adding amount of the pH regulator added by the first adding unit and the adding amount of the active medicament added by the second adding unit according to the pH value and the flow of the acidic wastewater.
3. An acidic wastewater treatment system according to claim 2, wherein:
the medicine adding device also comprises
The first storage unit is connected with the first adding unit and used for storing a pH regulator;
and the second storage unit is connected with the second adding unit and is used for storing active medicaments.
4. An acidic wastewater treatment system according to any of claims 1 to 3, wherein:
the ozone micro-nano bubble generating device comprises a primary air dissolving device and a secondary air dissolving device which are connected with each other and used for generating ozone micro-nano bubbles,
the primary air dissolving device is connected with the water inlet pipeline, and the secondary air dissolving device is connected with the micro-nano bubble reaction tower.
5. An acidic wastewater treatment system according to claim 4, wherein:
the primary gas dissolving device comprises an ozone generator and a gas-liquid mixing pump;
a first inlet of the gas-liquid mixing pump is connected with the ozone generator, a second inlet of the gas-liquid mixing pump is used for being connected with a water inlet pipeline, an outlet of the gas-liquid mixing pump is connected with an inlet of the secondary gas dissolving device, and an outlet of the secondary gas dissolving device is connected with a first inlet of the micro-nano bubble reaction tower;
preferably, the secondary air dissolving device comprises a cyclone type air bubble mixer.
6. An acidic wastewater treatment system according to any of claims 1 to 5, wherein:
the device also comprises an ultraviolet catalyst reaction tower, wherein a first outlet of the micro-nano bubble reaction tower is connected with a first inlet of the ultraviolet catalyst reaction tower;
a plurality of ultraviolet generators and catalyst packed beds are arranged in the ultraviolet catalyst reaction tower at intervals.
7. An acidic wastewater treatment system according to claim 6, wherein:
the second inlet of the micro-nano bubble reaction tower and the second inlet of the ultraviolet catalyst reaction tower are respectively connected with the water inlet pipeline;
and a first outlet of the ultraviolet catalyst reaction tower is connected with the ozone micro-nano bubble generating device.
8. A method for treating acidic wastewater is characterized by comprising the following steps: comprises the following steps
S1, introducing the acidic wastewater to be treated into an ozone micro-nano bubble generating device;
s2, generating a gas-liquid mixed solution containing ozone microbubbles in the ozone micro-nano bubble generating device;
s3, introducing the gas-liquid mixed liquid generated in the step S2 into a micro-nano bubble reaction tower for oxidation reaction;
step S1 comprises the steps of collecting the pH value and flow of the introduced acidic wastewater, adding a pH regulator in the process of introducing the ozone micro-nano bubble generating device according to the collected pH value, and regulating the pH value of the acidic wastewater to a set value;
and step S3, active agents are put into the micro-nano bubble reaction tower according to the collected flow.
9. The method for treating acidic wastewater according to claim 8, wherein: also comprises the following steps
And S4, introducing the wastewater after the oxidation reaction in the step S3 into an ultraviolet catalyst reaction tower, and treating the wastewater by utilizing the synergistic action of ozone, ultraviolet rays and a catalyst.
10. A method for treating acidic wastewater is characterized by comprising the following steps: comprises the following steps
S1, respectively introducing the acidic wastewater to be treated into a micro-nano bubble reaction tower and an ultraviolet catalyst reaction tower, and stopping introducing the acidic wastewater when the water amount in the micro-nano bubble reaction tower and the ultraviolet catalyst reaction tower exceeds a set water amount;
s2, when wastewater in the ultraviolet catalyst reaction tower is led into the ozone micro-nano bubble generating device, the wastewater in the micro-nano bubble reaction tower is supplemented into the ultraviolet catalyst reaction tower, so that the wastewater in the micro-nano bubble reaction tower and the ultraviolet catalyst reaction tower is circularly treated between the ozone micro-nano bubble generating device, the micro-nano bubble reaction tower and the ultraviolet catalyst reaction tower;
and step S1, collecting the pH value and flow rate of the introduced acidic wastewater, adding a pH regulator into the pipeline leading into the micro-nano bubble reaction tower and the ultraviolet catalyst reaction tower according to the collected pH value and flow rate, and adding an active medicament into the micro-nano bubble reaction tower and/or the ultraviolet catalyst reaction tower.
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