CN211497075U - Three-section type UV/O for sewage treatment3/H2O2Advanced oxidation system - Google Patents
Three-section type UV/O for sewage treatment3/H2O2Advanced oxidation system Download PDFInfo
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- CN211497075U CN211497075U CN201922114611.XU CN201922114611U CN211497075U CN 211497075 U CN211497075 U CN 211497075U CN 201922114611 U CN201922114611 U CN 201922114611U CN 211497075 U CN211497075 U CN 211497075U
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Abstract
The utility model discloses a syllogic UV/O for sewage treatment3/H2O2The advanced oxidation system comprises an ozone pre-oxidation tank, an advanced oxidation reaction tank, a deep advanced oxidation reaction tank, a water inlet pipe communicated with the ozone pre-oxidation tank, a water outlet pipe communicated with the deep advanced oxidation reaction tank and O arranged in the ozone pre-oxidation tank3/H2O2An oxidation reactor arranged in the advanced oxidation reaction tank and the UV/O in the deep advanced oxidation reaction tank3/H2O2An oxidation reactor; wherein O is3And H2O2The adding ratio of (A) to (B) is 3-10; the utility model has the advantages that ozone and hydrogen peroxide adopt a multi-point feeding mode, thereby ensuring that the feeding of the hydrogen peroxide and ozone in water is more uniform, and adopting UV and H2O2Catalytic O3The system does not need to adjust acid and alkali, backwash and sludge discharge, and the operating environment is good.
Description
Technical Field
The utility model relates to a feedwater treatment field especially relates to a syllogic UV/O for sewage treatment3/H2O2Advanced oxidation systems.
Background
Along with the development of social economy, the living standard of people is gradually improved, and the requirement of people on water quality is higher and higher. The traditional water treatment process mainly removes suspended matters, colloids, bacteria and the like in water, and has poor effect of removing soluble organic matters in water; advanced oxidation technology, one of the emerging treatment technologies, can directly mineralize refractory pollutants or improve the biodegradability of pollutants through oxidation, has the advantages of high treatment efficiency, complete damage to toxic pollutants and the like, and is widely applied to pretreatment and advanced treatment of toxic and refractory biodegradable industrial wastewater and advanced treatment processes for recycling municipal sewage and reclaimed water.
Advanced Oxidation Processes (AOPs for short) are technologies for treating toxic pollutants formed in the beginning of the 80 th 20 th century, and are characterized in that hydroxyl radicals (OH) are generated through reaction, have extremely strong oxidizability, and can effectively decompose organic pollutants through radical reaction and even thoroughly convert the organic pollutants into harmless inorganic substances such as carbon dioxide, water and the like; compared with the common chemical oxidation method, the advanced oxidation method has high reaction speed, and the general reaction rate constant is 108-1010mol-1Ls-1The treatment requirement can be met in a short time; UV/H2O2、UV/O3And O3/H2O2The processes are advanced oxidation technologies for generating hydroxyl radicals, and are independently operated systems, but the generation of the hydroxyl radicals in wastewater with complex components can be inhibited; for this, UV/O3/H2O2The combined process offers advantages in that it can generate hydroxyl radicals through a variety of reaction mechanisms.
At present, UV/O3/H2O2The combined feeding mode of (A) is short of related technologies and researches becauseHydroxyl radicals are strong oxidizers with a half-life of about 10-9s, very short residence time in water, excess H2O2It will act as an OH minacticide and further directly affect the effect of advanced oxidation.
SUMMERY OF THE UTILITY MODEL
In order to solve the problems, the utility model discloses a syllogic UV/O for sewage treatment is disclosed3/H2O2An advanced oxidation system, wherein ozone and hydrogen peroxide are added to different positions of the reaction tank body through multiple points in each reaction tank to prevent excessive H from being generated2O2And the effect of advanced oxidation is improved.
The utility model discloses a realize through following technical scheme: three-section type UV/O for sewage treatment3/H2O2The advanced oxidation system comprises an ozone pre-oxidation tank, an advanced oxidation reaction tank, a deep advanced oxidation reaction tank, a water inlet pipe communicated with the ozone pre-oxidation tank, a water outlet pipe communicated with the deep advanced oxidation reaction tank and O arranged in the ozone pre-oxidation tank3/H2O2An oxidation reactor arranged in the advanced oxidation reaction tank and the UV/O in the deep advanced oxidation reaction tank3/H2O2An oxidation reactor; wherein O is3And H2O2The adding ratio of (A) to (B) is 3-10.
By adopting the technical scheme, in each reaction tank, ozone and hydrogen peroxide are added to different positions of the reaction tank body through multiple points so as to prevent excessive H from being generated2O2The effect of advanced oxidation is improved; and H2O2High solubility, O3High extinction coefficient, combined with a photocatalytic system, catalyzes O3Generating strong oxidizing OH; UV/H under the same power consumption condition2O2/O3Relatively UV/H2O2、UV/O3、H2O2/O3The treatment efficiency of the process for removing the pollutants is high, and the treatment cost for removing the pollutants per unit is low.
Further, said O is3/H2O2The oxidation reactor comprises O3Dosing facility and H2O2Addition facility, said O3The adding facility comprises a liquid oxygen storage tank for generating an oxygen source, a gasifier connected with the liquid oxygen storage tank, an ozone generator connected with the gasifier, an ozone flow distribution system connected with the ozone generator, and an ozone adding pipeline connected with the ozone flow distribution system; wherein the ozone adding pipeline adopts a point-by-point mode to arrange O in the ozone pre-oxidation tank, the advanced oxidation reaction tank and the deep advanced oxidation reaction tank3And a feeding outlet A.
Through the technical scheme, the ozone flow distribution system is a set of independent devices, comprises a flowmeter, a valve, a pressure gauge, a pipeline and the like, is used for carrying out flow distribution on ozone generated by the ozone generator through regulation, and the distributed ozone enters the reaction tank through the pipeline; the proportion of the ozone distribution is determined according to the ozone amount required by each section of the project, and the flow distribution system of each project is inconsistent and is determined according to the actual condition of the project.
Further, said H2O2The feeding facility comprises a storage of H2O2The hydrogen peroxide feeding system comprises a hydrogen peroxide storage tank, a hydrogen peroxide feeding pump connected with the hydrogen peroxide storage tank, a hydrogen peroxide flow distribution system connected with the hydrogen peroxide feeding pump, and a hydrogen peroxide feeding pipeline connected with the hydrogen peroxide flow distribution system; wherein H2O2The feeding pipeline adopts a point-by-point mode to arrange H in the ozone pre-oxidation tank, the advanced oxidation reaction tank and the deep advanced oxidation reaction tank2O2And a feeding outlet B.
By the technical scheme, the hydrogen peroxide in the hydrogen peroxide storage tank is distributed by the hydrogen peroxide flow distribution system, namely the flow distributed to each branch pipe is different according to the actual conditions of the project; the pre-buried sleeve is used for enabling the hydrogen peroxide pipe to penetrate through a hole reserved in the top of the reaction tank, so that a hydrogen peroxide adding pipeline is installed at the later stage; and the position of the hydrogen peroxide adding embedded sleeve 551 is at the position of a hydrogen peroxide adding point.
Further, the UV/O3/H2O2The oxidation reactor comprises a UV photocatalysis device which is vertically arranged in an advanced oxidation reaction tank and a deep advanced oxidation reaction tank, whereinThe ultraviolet dose of the UV photocatalysis device is 150mJ/cm2-650mJ/cm2And the ratio of the ultraviolet dose in the advanced oxidation reaction tank to the ultraviolet dose in the deep advanced oxidation reaction tank is 1-2.
Further, the UV photocatalysis device comprises ultraviolet equipment and a gas collecting hood arranged at the top of the reaction tank, wherein the ultraviolet equipment is used for promoting the reaction of ozone and hydrogen peroxide to generate hydroxyl radicals, and the gas collecting hood is used for sealing the ultraviolet equipment in the advanced oxidation reaction tank and the deep advanced oxidation reaction tank.
Preferably, O in the ozone pre-oxidation pond3The ratio of the adding concentration to the COD removal is 1-3; o in the advanced oxidation reaction tank3The ratio of the adding concentration to the COD removal is 2-6; o in the deep advanced oxidation reaction tank3The ratio of the adding concentration to the COD removal is 3-6.
Furthermore, the top of the advanced oxidation reaction tank is provided with an ozone tail gas decomposition and destruction device, and the ozone tail gas decomposition and destruction device is used for decomposing residual tail gas in the ozone pre-oxidation tank, the advanced oxidation reaction tank and the advanced oxidation reaction tank into oxygen.
Compared with the prior art, the utility model has the advantages of it is following:
1. in each reaction tank, ozone and hydrogen peroxide are added to different positions of the reaction tank body through multiple points so as to prevent excessive H from being generated2O2The effect of advanced oxidation is improved; and H2O2High solubility, O3High extinction coefficient, combined with a photocatalytic system, catalyzes O3Generating strong oxidizing OH; UV/H under the same power consumption condition2O2/O3Relatively UV/H2O2、UV/O3、H2O2/O3The treatment efficiency of the process for removing the pollutants is high, and the treatment cost for removing the pollutants per unit is low.
2. The system has small floor area and low investment cost;
3. the system has high operation efficiency and low operation cost;
4. the catalyst is stable and no sludge is generated; by usingUV、H2O2Catalytic O3In comparison with the transition metal catalyst, H2O2There is no fear of deactivation, and the UV system can be appropriately replaced according to the output intensity; the system does not generate sludge and does not need a backwashing and sludge discharging system.
5. The process is flexible to operate and the operating environment is good; the system can be used for advanced treatment and improvement of B/C ratio, and the operation condition of the system can be optimized by adjusting the medicament feeding point, the feeding concentration and other measures according to the characteristics of water quality in the engineering; the system does not need to adjust acid and alkali, backwash and sludge discharge, and the operating environment is good;
6. the hydrogen peroxide is fed in a tubular injection mode, so that the reliability is high, the performance is excellent, and the precise drilling is beneficial to conveying the hydrogen peroxide with high efficiency.
Drawings
Fig. 1 is a technical route diagram of the present invention;
FIG. 2 is a mechanism diagram of the present invention;
FIG. 3 is a system block diagram of the present invention;
fig. 4 is a system elevation of the present invention.
In the figure, 1, an ozone pre-oxidation pond; 101. a manhole; 2. an advanced oxidation reaction tank; 3. a deep advanced oxidation reaction tank; 31. a demister; 4. o is3A dosing facility; 41. a liquid oxygen storage tank; 42. a gasifier; 43. an ozone generator; 44. an ozone flow distribution system; 45. an ozone adding pipeline; 451. an ozone inlet branch pipe; 46. o is3A feeding outlet A; 5. h2O2A dosing facility; 51. a hydrogen peroxide storage tank; 52. a stop valve; 53. a hydrogen peroxide adding pump; 54. a hydrogen peroxide flow distribution system; 55. a hydrogen peroxide feeding pipeline; 551. adding hydrogen peroxide into the embedded sleeve; 56. h2O2A feeding outlet B; 6. an ultraviolet device; 7. A water inlet pipe; 8. a water outlet pipe; 9. ozone tail gas decomposition destroying device; 10. a bi-directional ventilation breather valve; 11. a gas-collecting hood; 12. an aeration disc.
Detailed Description
The present invention will be further described with reference to the accompanying drawings.
Be used for sewage treatmentThree-stage UV/O3/H2O2An advanced oxidation system, as shown in fig. 1 and fig. 3, comprises an ozone pre-oxidation tank 1, an advanced oxidation reaction tank 2, a deep advanced oxidation reaction tank 3, and O arranged in the ozone pre-oxidation tank 1 in sequence3/H2O2An oxidation reactor arranged in the advanced oxidation reaction tank 2 and the deep advanced oxidation reaction tank 33/H2O2An oxidation reactor.
On the basis of the scheme, as shown in fig. 1 and 3, a water inlet communicated with the ozone pre-oxidation tank 1 is formed in the side wall of the ozone pre-oxidation tank 1, the water inlet is connected with a biochemical treatment device through a water inlet pipe 7, so that the biochemically treated sewage flows into the ozone pre-oxidation tank 1 through the water inlet pipe 7, and the sewage in the ozone pre-oxidation tank 1 is in an O state3/H2O2Part of COD is removed under the action of the oxidation reactor, and part of the refractory macromolecular substances are decomposed into micromolecular substances; then the sewage treated by the ozone pre-oxidation tank 1 flows into an advanced oxidation reaction tank 2, and the advanced oxidation reaction tank 2 is subjected to UV/O3/H2O2Under the action of the oxidation reactor, the sewage is subjected to various reactions of ring opening and chain scission, and COD is further removed; the sewage treated by the advanced oxidation reaction tank 2 enters a deep advanced oxidation reaction tank 3 and is treated in a UV/O (ultraviolet/oxygen) mode3/H2O2The COD which is difficult to degrade is removed under the action of the oxidation reactor, thereby ensuring that the quality of the effluent of the advanced oxidation reaction tank 3 reaches the standard.
As shown in FIG. 3, O3/H2O2The oxidation reactor comprises O3Dosing facilities 4 and H2O2A dosing facility 5, wherein O3The adding facility 4 comprises a liquid oxygen storage tank 41 for generating an oxygen source, a gasifier 42 connected with the liquid oxygen storage tank 41, an ozone generator 43 connected with the gasifier 42, an ozone flow distribution system 44 connected with the ozone generator 43, and an ozone adding pipeline 45 connected with the ozone flow distribution system 44; wherein the ozone adding pipeline 45 adopts a point-by-point mode to arrange O in the ozone pre-oxidation tank 1, the advanced oxidation reaction tank 2 and the deep advanced oxidation reaction tank 33A feeding outlet A46; namely ozone flow distribution system44 three ozone feeding pipelines 45 are arranged at the top of the ozone pre-oxidation tank 1, the advanced oxidation reaction tank 2 and the deep advanced oxidation reaction tank 3 in a point-by-point mode, and the tail ends of the three ozone feeding pipelines 45 are provided with O corresponding to the ozone pre-oxidation tank 1, the advanced oxidation reaction tank 2 and the deep advanced oxidation reaction tank 33A feeding outlet A46; the liquid oxygen storage tank 41 generates an oxygen source, the oxygen source enters the ozone generator 43 after being decompressed and stabilized by the decompression device, ozone generated by the ozone generator 43 is distributed by the ozone flow distribution system 44 through flow, and the distributed ozone enters the ozone pre-oxidation tank 1, the advanced oxidation reaction tank 2 and the advanced oxidation reaction tank 3 through the ozone feeding pipeline 45.
The ozone flow distribution system 44 is a single conventional device, and includes a flow meter, a valve, a pressure gauge, a pipeline, etc. for distributing the flow of ozone generated by the ozone generator by adjusting, the distribution ratio is determined according to the ozone amount required by each section of the project, and the flow distribution system of each project is determined according to the actual situation of the project.
As shown in FIG. 1 and FIG. 2, the ozone pre-oxidation tank 1 is controlled to be O3、H2O2Under the conditions of the adding amount and the adding proportion, hydroxyl free radicals with extremely strong oxidizability are generated to decompose part of difficultly-degraded macromolecular substances in the sewage into micromolecular substances or directly mineralize the micromolecular substances, remove part of COD (chemical oxygen demand) and decolor the sewage, and simultaneously can improve the light transmittance (UVT) of a water body and provide good water quality conditions for a subsequent photocatalytic system; and O in the ozone pre-oxidation tank3/H2O2The OH generation mechanism in the oxidation reactor is as follows:
H2O2→H++HO2 －
HO2 －+O3→HO2·－+O3·－
HO2·－→O2·－+H+
O2·－+O3→O2+O3·－
O3·－+H+→HO3·
HO3·→·OH+O2
as shown in fig. 1 and 3, H2O2The feeding facility 5 comprises a storage device for storing H2O2The hydrogen peroxide solution storage tank 51, a hydrogen peroxide solution feeding pump 53 connected with the hydrogen peroxide solution storage tank 51, a hydrogen peroxide solution flow distribution system 54 connected with the hydrogen peroxide solution feeding pump 53, and a hydrogen peroxide solution feeding pipeline 55 connected with the hydrogen peroxide solution flow distribution system 54, wherein the hydrogen peroxide solution feeding pipeline is provided with H in a point division manner in the ozone pre-oxidation tank 1, the advanced oxidation reaction tank 2 and the deep advanced oxidation reaction tank 32O2A feeding outlet B56; i.e. H2O2From the storage tank and into H via the metering pump and the shut-off valve 522O2Flow distribution system, H coming out of flow distribution system2O2Warp H2O2And the feeding outlet B56 is respectively fed into the ozone pre-oxidation tank 1, the advanced oxidation reaction tank 2 and the deep advanced oxidation reaction tank 3.
On the basis of the scheme, as shown in fig. 1 and fig. 3, an ozone tail gas decomposition and destruction device 9 is arranged in the deep advanced oxidation reaction tank 3, the residual tail gas in the ozone pre-oxidation tank 1, the advanced oxidation reaction tank 2 and the deep advanced oxidation reaction tank 3 enters the ozone tail gas decomposition and destruction device 9 through an inlet valve under the action of an induced draft fan, the residual tail gas is decomposed into oxygen through heating and catalytic actions, and the decomposed oxygen is discharged to the atmosphere through an exhaust fan (not shown in the figure).
As shown in FIG. 3, UV/O3/H2O2The oxidation reactor comprises a UV photocatalysis device which is vertically arranged in an advanced oxidation reaction tank 2 and a deep advanced oxidation reaction tank 3, and the ultraviolet dose of the UV photocatalysis device is 150mJ/cm2-650 mJ/cm2The ratio of the ultraviolet dose in the advanced oxidation reaction tank 2 to the ultraviolet dose in the deep advanced oxidation reaction tank 3 is 1-2; namely, H in the advanced oxidation reaction tank 2 under the excitation of UV2O2And O3Can generate hydroxyl free radicals through various ways, and react with pollutants in the wastewater without selection to generate various reactions such as chain scission, ring opening and the likeThe material is degraded into carbon dioxide, water and harmless substances, and secondary pollution is not generated; wherein the UV/O in the advanced oxidation reaction tank 2 and the deep advanced oxidation reaction tank3/H2O2The OH generation mechanism in the oxidation reactor is as follows:
3O3+OH-+H+→2·OH+4O2
O3+hv→O2+O(1D)
O(1D)+H2O→2·OH
H2O2→H++HO2 －
HO2 －+O3→·OH+O2 －+O2
H2O2+hv→2·OH
as shown in fig. 3 and 4, the UV photocatalytic device includes an ultraviolet device 6 and a gas-collecting hood 11 installed on the top of the reaction tank, the ultraviolet device 6 is used for promoting the reaction of ozone and hydrogen peroxide to generate hydroxyl radicals so as to remove pollutants, and the gas-collecting hood 11 seals the ultraviolet device 6 in the advanced oxidation reaction tank 2 and the deep advanced oxidation reaction tank 3.
On the basis of the scheme, the ultraviolet equipment 6 belongs to conventional equipment well known in the field, and specifically comprises a supporting plate, supporting legs, a supporting column, a sleeve, an ultraviolet lamp tube, a quartz tube, a detection head, a refraction plate, a cylinder, a lifting plate, an electrical box, a ballast, a control plate and a cleaning ring; the ultraviolet lamp tubes are sleeved in sleeves, the sleeves are uniformly and alternately arranged in the overlooking direction, round holes which are arranged in a staggered mode are arranged on the supporting plate, and the sleeves are inserted into the round holes and are vertically and fixedly connected with the supporting plate through fasteners.
On the basis of the above scheme, in order to control O3、H2O2The addition amount and the addition proportion of O3And H2O2The adding ratio of (A) to (B) is 3-10; due to different water quality and water quantity requirements, O3The adding can adopt the adding modes of an aeration disc, a gas-liquid mixing pump, an ejector and the like so as to fully meet the requirement of adding gas-liquid mixing for ozone.
On the basis of the scheme, as shown in fig. 4, manholes are formed in the tops of the ozone pre-oxidation tank 1, the advanced oxidation reaction tank 2 and the deep advanced oxidation reaction tank 3, so that maintenance personnel can conveniently enter and exit the reaction tanks for installation, maintenance and safety inspection.
As shown in FIG. 4, the ozone pre-oxidation tank 1, the advanced oxidation reaction tank 2 and the advanced oxidation reaction tank 3 are provided with aeration trays 12 at the bottom and O3The feeding outlet A is connected to the bottom aeration tray 12 through an ozone inlet branch pipe 451 so that O is introduced into the bottom aeration tray3Is distributed to the aeration disc 12 through the ozone inlet branch pipe 451 and respectively enters the reaction tanks of the ozone pre-oxidation tank 1, the advanced oxidation reaction tank 2 and the deep advanced oxidation reaction tank 3 through micropores on the aeration disc 12.
As shown in fig. 3 and 4, due to different water quality and water quantity requirements, the hydrogen peroxide adopts a tubular injection adding mode, that is, the hydrogen peroxide flowing out from the hydrogen peroxide flow distribution system 54 flows through a hydrogen peroxide adding embedded sleeve 551 provided with a hydrogen peroxide adding pipeline 55, and the hydrogen peroxide adding pipeline 55 is transversely arranged on the upper part of the whole overflowing section, the pipeline of the hydrogen peroxide adding pipeline 55 is provided with micropores corresponding to the reaction tank, and the hydrogen peroxide is injected into the reaction tanks of the ozone pre-oxidation tank 1, the advanced oxidation reaction tank 2 and the deep advanced oxidation reaction tank 3 through the micropores on the hydrogen peroxide adding pipeline 55 and is mixed with the water in the reaction tanks.
On the basis of the scheme, preferably, the high-pressure feeding is carried out by adopting a high-precision metering pump, the feeding pressure is 50-100bar, and then the mixture is mixed with water through the micropore injection of a pipeline.
On the basis of the above scheme, in order to control O3The adding concentration of the oxygen in an ozone pre-oxidation tank and O in the ozone pre-oxidation tank3The ratio of the adding concentration to the removal of COD is 1-3, partial organic pollutants such as industrial solvents (vinyl chloride, trichloroethylene and the like), food additives, pesticides, NOM and the like have high reaction rate with OH, can be effectively removed in the ozone pre-oxidation tank 1, and meanwhile, partial organic pollutants which are difficult to degrade can be decomposed into small molecular substances which can be further mineralized in the advanced oxidation reaction tank 2;
in the advanced oxidation reaction tank 2, the advancedThe oxidation reaction tank 2 can generate OH and O through various ways3The ratio of the adding concentration to the removal of COD is 2-6, part of organic pollutants in the advanced oxidation reaction tank 2 can be completely mineralized to generate carbon dioxide and water, and no secondary pollution is caused;
in the deep advanced oxidation reaction tank 3, the reaction rate of hydroxyl radicals and pollutants is slow, and O is3The ratio of the adding concentration to the removal of COD is 3-6, so as to remove part of organic pollutants which are extremely difficult to degrade.
On the basis of the scheme, the sewage after biochemical treatment comprises certain components in the water body as follows: humic and fulvic acids, aromatic organics (such as phenols); metal ions (e.g., iron ions); negative ions (such as nitrate and sulfite) and the like have an absorption effect on ultraviolet rays, influence the light transmittance (UVT) of a water body and reduce the performance of the whole photocatalytic system, so that ultraviolet equipment is not suitable for being adopted in the ozone pre-oxidation tank 1.
Based on the scheme, the following specific examples are provided for the non-degradable industrial wastewater with COD of less than 200 mg/L:
example 1
The sewage enters an ozone pre-oxidation tank 1 through a water inlet pipe 7 and passes through O in the ozone pre-oxidation tank 13/H2O2The oxidation reactor removes part of COD and decomposes part of refractory macromolecular substances into micromolecular substances so as to facilitate further oxidation treatment.
The sewage after pre-oxidation treatment enters an advanced oxidation reaction tank 2 from the bottom, a UV photocatalysis device is vertically arranged in the advanced oxidation reaction tank 2, and UV/O passes through the UV photocatalysis device3/H2O2The oxidation reactor generates various reactions such as chain scission, ring opening and the like to further remove COD.
The effluent of the advanced oxidation reaction tank 2 enters a deep advanced oxidation reaction tank 3, and the UV/O passes through the section3/H2O2And the oxidation reactor is used for removing the COD which is difficult to degrade, and further ensuring the quality of the effluent to reach the standard.
The amount of treated water in this example was 120m3D, the retention time is 2 hours, wherein the adding concentration of ozone is 270mg/L, the adding concentration of hydrogen peroxide is 100mg/L, and the ultraviolet dose is 370mJ/cm2。
Example 2
The treated water quantity is 20000m3And d, the retention time is 2 hours, wherein the adding concentration of ozone is 120mg/L, the adding concentration of hydrogen peroxide is 30mg/L, the ultraviolet dose is 257mJ/cm2, and the rest is the same as that of the embodiment 1.
Example 3
The treated water amount is 40000m3D, the retention time is 2 hours, wherein the adding concentration of ozone is 72mg/L, the adding concentration of hydrogen peroxide is 25mg/L, and the ultraviolet dose is 220mJ/cm2Otherwise, the same procedure as in example 1 was repeated.
TABLE 1 Water quality index Table combining the above examples
In conclusion, aiming at the difficultly degraded industrial wastewater with the COD of less than 200mg/L, the COD can be reduced to below 50mg/L or even below 30mg/L by adopting the technical scheme, the hydraulic retention time is 1.0-3.0h, the effective water depth is 6m, and the occupied area of each ton of water only needs about 0.015-0.03m2/m3And d, the civil construction cost is low.
The above-described embodiments merely represent one or more embodiments of the present invention, which are described in greater detail and detail, but are not to be construed as limiting the scope of the invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention.
Claims (7)
1. Three-section type UV/O for sewage treatment3/H2O2The advanced oxidation system is characterized by comprising an ozone pre-oxidation tank (1), an advanced oxidation reaction tank (2) and a deep advanced oxidation reaction tank (3) which are sequentially connected, wherein the ozone pre-oxidation tank (1) is connected with the advanced oxidation reaction tank through a water inlet pipe(7) The water outlet pipe (8) positioned at the tail end of the advanced oxidation reaction tank (3) discharges the treated water body, and the ozone pre-oxidation tank (1) is internally provided with O3/H2O2The oxidation reactor, the advanced oxidation reaction tank (2) and the deep advanced oxidation reaction tank (3) are all internally provided with UV/O3/H2O2An oxidation reactor; wherein said O is3/H2O2Oxidation reactor and UV/O3/H2O2In oxidation reactor O3And H2O2The adding ratio of (A) to (B) is 3-10.
2. The three-stage UV/O for wastewater treatment of claim 13/H2O2Advanced oxidation system, characterized in that said O3/H2O2The oxidation reactor comprises O3A feeding facility (4) and H2O2A feeding facility (5), said O3The adding facility (4) comprises a liquid oxygen storage tank (41) for generating an oxygen source, a gasifier (42) connected with the liquid oxygen storage tank (41), an ozone generator (43) connected with the gasifier (42), an ozone flow distribution system (44) connected with the ozone generator (43), and an ozone adding pipeline (45) connected with the ozone flow distribution system (44); wherein the ozone adding pipeline (45) adopts a point-by-point mode to arrange O in the ozone pre-oxidation tank (1), the advanced oxidation reaction tank (2) and the deep advanced oxidation reaction tank (3)3And an addition outlet A (46).
3. The three-stage UV/O for wastewater treatment of claim 23/H2O2Advanced oxidation system, characterized in that said H2O2The feeding facility (5) comprises a storage of H2O2The hydrogen peroxide adding system comprises a hydrogen peroxide storage tank (51), a hydrogen peroxide adding pump (53) connected with the hydrogen peroxide storage tank (51), a hydrogen peroxide flow distribution system (54) connected with the hydrogen peroxide adding pump (53), and a hydrogen peroxide adding pipeline (55) connected with the hydrogen peroxide flow distribution system (54); wherein the hydrogen peroxide adding pipeline (55) adopts a point-by-point mode to be arranged in the ozone pre-oxidation tank (1), the advanced oxidation reaction tank (2) and the deep advanced oxidation reaction tank (3)Are all provided with H2O2And an addition outlet B (56).
4. The three-stage UV/O for wastewater treatment of claim 33/H2O2Advanced oxidation system, characterized in that said UV/O3/H2O2The oxidation reactor comprises a UV photocatalysis device which is vertically arranged in an advanced oxidation reaction tank (2) and a deep advanced oxidation reaction tank (3), wherein the ultraviolet dose of the UV photocatalysis device is 150mJ/cm2-650 mJ/cm2And the ratio of the ultraviolet doses in the advanced oxidation reaction tank (2) and the deep advanced oxidation reaction tank (3) is 1-2.
5. The three-stage UV/O for wastewater treatment of claim 43/H2O2The advanced oxidation system is characterized in that the UV photocatalysis device comprises ultraviolet equipment (6) and a gas collecting hood (11) arranged at the top of a reaction tank of the UV photocatalysis device, wherein the ultraviolet equipment (6) is used for promoting the reaction of ozone and hydrogen peroxide to generate hydroxyl radicals, and the gas collecting hood (11) is used for sealing the ultraviolet equipment (6) in the advanced oxidation reaction tank (2) and the deep advanced oxidation reaction tank (3).
6. The three-stage UV/O for wastewater treatment of claim 13/H2O2The advanced oxidation system is characterized in that O in the ozone pre-oxidation pond (1)3The ratio of the adding concentration to the COD removal is 1-3; o in the advanced oxidation reaction tank (2)3The ratio of the adding concentration to the COD removal is 2-6; o in the deep advanced oxidation reaction tank (3)3The ratio of the adding concentration to the COD removal is 3-6.
7. The three-stage UV/O for wastewater treatment of claim 13/H2O2The advanced oxidation system is characterized in that an ozone tail gas decomposition and destruction device (9) is arranged at the top of the deep advanced oxidation reaction tank (3), and the ozone tail gas decomposition and destruction device (9) is used for pre-oxidizing ozoneThe residual tail gas in the chemical pool (1), the advanced oxidation reaction pool (2) and the deep advanced oxidation reaction pool (3) is decomposed into oxygen.
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