CN110980920B - Efficient aeration oxidation method and equipment for wastewater - Google Patents
Efficient aeration oxidation method and equipment for wastewater Download PDFInfo
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- CN110980920B CN110980920B CN201911339797.7A CN201911339797A CN110980920B CN 110980920 B CN110980920 B CN 110980920B CN 201911339797 A CN201911339797 A CN 201911339797A CN 110980920 B CN110980920 B CN 110980920B
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- 239000002351 wastewater Substances 0.000 title claims abstract description 155
- 238000005273 aeration Methods 0.000 title claims abstract description 105
- 238000007254 oxidation reaction Methods 0.000 title claims abstract description 73
- 230000003647 oxidation Effects 0.000 title claims abstract description 70
- 238000000034 method Methods 0.000 title claims abstract description 40
- 230000000694 effects Effects 0.000 claims abstract description 18
- 230000003197 catalytic effect Effects 0.000 claims abstract description 11
- 239000000945 filler Substances 0.000 claims abstract description 10
- 230000001699 photocatalysis Effects 0.000 claims description 12
- 239000003054 catalyst Substances 0.000 claims description 8
- RYTYSMSQNNBZDP-UHFFFAOYSA-N cobalt copper Chemical compound [Co].[Cu] RYTYSMSQNNBZDP-UHFFFAOYSA-N 0.000 claims description 8
- 238000006213 oxygenation reaction Methods 0.000 claims description 5
- 230000002708 enhancing effect Effects 0.000 claims 1
- 238000005276 aerator Methods 0.000 abstract description 13
- 238000005265 energy consumption Methods 0.000 abstract description 4
- 238000003912 environmental pollution Methods 0.000 abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 41
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 24
- 238000012856 packing Methods 0.000 description 23
- 239000003638 chemical reducing agent Substances 0.000 description 6
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 5
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 description 5
- 239000003546 flue gas Substances 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 238000005406 washing Methods 0.000 description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 4
- 230000001590 oxidative effect Effects 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 238000004065 wastewater treatment Methods 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 229910017052 cobalt Inorganic materials 0.000 description 3
- 239000010941 cobalt Substances 0.000 description 3
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 235000003891 ferrous sulphate Nutrition 0.000 description 3
- 239000011790 ferrous sulphate Substances 0.000 description 3
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 description 3
- 229910000359 iron(II) sulfate Inorganic materials 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-L sulfite Chemical compound [O-]S([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-L 0.000 description 1
- 229910021653 sulphate ion Inorganic materials 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
Classifications
-
- 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
- C02F1/008—Control or steering systems not provided for elsewhere in subclass C02F
-
- 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
-
- 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
- C02F1/74—Treatment of water, waste water, or sewage by oxidation with air
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/18—Nature of the water, waste water, sewage or sludge to be treated from the purification of gaseous effluents
-
- 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]
-
- 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
- C02F2305/02—Specific form of oxidant
- C02F2305/023—Reactive oxygen species, singlet oxygen, OH radical
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
- Catalysts (AREA)
Abstract
The invention discloses a high-efficiency aeration oxidation method and equipment for wastewater. The device comprises an aeration tank, at least one fan, at least one jet circulation pump, at least one jet aerator, a filler component and a nano photon catalytic oxidation device. The method of the invention has the advantages of good effect of wastewater aeration and oxidation, little secondary environmental pollution and low energy consumption. The invention has simple structure and low investment cost.
Description
Technical Field
The invention relates to the field of water treatment, in particular to a high-efficiency aeration oxidation method and equipment for wastewater.
Background
In the process of wastewater treatment, especially in the process of discharging flue gas washing wastewater, the situation that COD exceeds standard exists commonly, and the wastewater is unsuitable for biochemical treatment due to higher salt content, so that other simple and rapid methods for removing COD in the wastewater are needed.
The mature processes for treating the wastewater at present comprise Fenton oxidation, ozone oxidation, hydrogen peroxide oxidation and the like, but each method has obvious defects, so that the application cannot be realized rapidly. For example, fenton oxidization requires adding ferrous sulfate and hydrogen peroxide, and finally generates a large amount of sludge to cause secondary pollution; ozone oxidation requires a large amount of electric energy consumption, and causes secondary pollution problems; the hydrogen peroxide is required to be added for oxidization, but the COD of the wastewater to be treated is unstable, so that the adding amount of the hydrogen peroxide is not easy to control, too little hydrogen peroxide is added, the COD of the wastewater after treatment is too high, too much hydrogen peroxide is added, and excessive adding is easy to cause, so that the COD of the wastewater after treatment is increased.
Therefore, how to effectively, economically and safely degrade waste water, especially COD of flue gas washing waste water, in the water treatment process is a problem to be solved urgently.
Disclosure of Invention
Aiming at the defects existing in the existing wastewater treatment process, particularly the method for reducing the COD (chemical oxygen demand) of the wastewater, one aspect of the invention aims to provide a high-efficiency aeration oxidation method for wastewater. The method has the advantages of little secondary environmental pollution, low energy consumption and good wastewater treatment effect.
In order to achieve the purpose of the invention, the invention adopts the following technical scheme:
a method for efficient aeration oxidation of wastewater, the method comprising the steps of:
(1) Measuring COD of wastewater inflow to be treated, calculating a required air quantity, setting the inflow amount of wastewater inflow according to oxygenation efficiency, and adjusting the inflow amount according to COD of wastewater outflow after treatment so that the COD of wastewater outflow is reduced below a preset value;
(2) When the COD of the effluent of the wastewater exceeds the preset value, the aeration effect of the wastewater under aeration is further enhanced by jet aeration, so that the COD of the effluent of the wastewater is reduced below the preset value,
Wherein in the steps (1) and (2), the filler is used for catalytic oxidation in the wastewater aeration process.
In a preferred embodiment, in the high-efficiency aeration oxidation method of wastewater, the filler is a nano copper cobalt catalyst. In a preferred embodiment, the copper cobalt catalyst comprises 12% copper, 8% cobalt, and 80% alumina. In a preferred embodiment, the particle size of the copper cobalt catalyst is from 2.5 to 25nm. In a preferred embodiment, the catalytic oxidation packing is spherical.
In a preferred embodiment, the method for high-efficiency aeration oxidation of wastewater according to the present invention further comprises further increasing the oxidation effect by hydroxyl radicals such that the COD of the wastewater effluent meets the requirement when the COD of the wastewater influent is abnormally high or the COD standard requirement of the wastewater effluent is lower than the above-mentioned predetermined value (for example, the COD standard of the wastewater effluent is 200 mg/L).
In a preferred embodiment, the hydroxyl radicals are generated by a nanophotonic photocatalytic device in the high efficiency aeration oxidation process of wastewater of the present invention.
In a preferred embodiment, in the high efficiency aeration oxidation process of wastewater of the present invention, the inlet of the wastewater feed in step (1) is provided by a fan.
It is another object of the present invention to provide an apparatus for efficient aeration oxidation of wastewater, the apparatus comprising an aeration tank, at least one fan, at least one jet circulation pump, at least one jet aerator and a packing, wherein the fan is for providing an inlet air to the wastewater in the aeration tank, which is provided outside the aeration tank, connected to an upper portion of the jet aerator,
The jet circulation pump is used for providing jet aeration for the wastewater in the aeration tank, is arranged outside the aeration tank and is connected with the lower part of the jet aerator,
The filler component is used for catalyzing and oxidizing the wastewater in the aeration tank, is arranged in the aeration tank and is positioned at the middle upper part.
In a preferred embodiment, the packing element in the apparatus for the efficient aeration oxidation of wastewater according to the present invention is composed of a packing and a net-like housing.
In a preferred embodiment, in the apparatus for high efficiency aeration oxidation of wastewater of the present invention, the filler is a nano copper cobalt catalyst. In a preferred embodiment, the copper cobalt catalyst comprises 12% copper, 8% cobalt, and 80% alumina. In a preferred embodiment, the particle size of the copper cobalt catalyst is from 2.5 to 25nm. In a preferred embodiment, the catalytic oxidation packing is spherical.
In a preferred embodiment, the apparatus for high efficiency aeration oxidation of wastewater of the present invention further comprises a nanophotonic catalytic oxidation device for generating hydroxyl radicals to further oxidize wastewater in the aeration process.
In a preferred embodiment, in the apparatus for efficient aeration oxidation of wastewater of the present invention, the nanophotonic catalytic oxidation means is disposed inside the packing member at a middle lower portion.
In a preferred embodiment, the apparatus for the efficient aeration oxidation of wastewater of the present invention further comprises a water outlet basin, said basin being in communication with said aeration Chi Gejian.
In a preferred embodiment, in the apparatus for efficient aeration oxidation of wastewater of the present invention, the number of the jet aerators corresponds to the number of the fans. In a preferred embodiment, the number of aerators and the number of fans in the apparatus for efficient aeration oxidation of wastewater of the present invention are 2.
In a preferred embodiment, the number of jet circulation pumps in the apparatus for the efficient aeration oxidation of wastewater of the present invention is 3.
The high-efficiency aeration oxidation method of the wastewater ensures that the aeration oxidation effect of the wastewater is good, the secondary environmental pollution is small, the energy consumption of the method is low, and the COD of the wastewater can be stably controlled.
The equipment for high-efficiency aeration oxidation of wastewater has simple structure, is convenient to install, operate and maintain, solves the problems of large occupied area and low aeration efficiency of the existing wastewater treatment equipment, reduces the investment cost of adding auxiliary facilities for chemical components (such as ferrous sulfate and hydrogen peroxide used in a Fenton oxidation method and hydrogen peroxide used in a hydrogen peroxide oxidation method) for reducing COD and the running cost for continuously adding the chemical components in the production process, realizes stable aeration oxidation performance, and can realize the COD control of wastewater effluent within a preset range (such as 500 mg/L).
Drawings
In order to more clearly illustrate the technical solution of the embodiments of the present invention, the drawings that are required for the embodiments will be briefly described below.
FIG. 1 is a schematic view showing an example of the structure of an apparatus for high-efficiency aeration oxidation of wastewater according to the present invention.
Fig. 2 is a partial cross-sectional view of the apparatus of fig. 1.
Fig. 3 is an enlarged view of the structure of the packing member of fig. 1.
Detailed Description
In the description of the present invention, "abnormally high" means that the COD of wastewater influent is significantly higher than the usual COD of wastewater influent for a period of time. For example, wastewater influent typically has a COD of 800 to 1000mg/L, but the COD of the wastewater influent suddenly reaches 2000mg/L or more over a certain period of time.
In the description of the present invention, "connected" may refer to fluid communication.
The fans, jet circulation pumps and jet aerators of the apparatus for efficient aeration oxidation of wastewater of the present invention may be plural, for example, 2, 3, 4,5 or more, respectively. The number of fans corresponds to the number of jet aerators.
The jet circulation pump of the device for high-efficiency aeration oxidation of wastewater of the invention is not normally started, and is started only when the COD of the outlet water after aeration exceeds a preset value, for example 500 mg/L.
The nano photon catalytic oxidation device for the equipment for high-efficiency aeration oxidation of the wastewater is not started under normal conditions, and is started only when the COD of the wastewater inlet water entering the aeration tank is abnormally high or the standard of the COD of the wastewater outlet water is lower than a preset value of the COD.
The invention is further illustrated in the following, in conjunction with the accompanying drawings and detailed embodiments. It is to be understood that these examples are illustrative of the present invention and are not intended to limit the scope of the present invention.
Example 1
As shown in fig. 1 and 2, in this example, an apparatus 1 for efficient aeration oxidation of wastewater includes an aeration tank 11, fans 20 (2 are shown in fig. 1), jet circulation pumps 30 (3 are shown in fig. 1), jet aerators 40 (2 are shown in fig. 1), a packing member 50, and a nanophotonic photocatalytic device 70. The apparatus further comprises a water inlet lift pump 10, an aeration tank 11, a water outlet tank 12 and a water outlet lift pump 60.
The blower 20 is provided outside the aeration tank, for example, in a blower room, connected to the upper portion of the jet aerator 40 through a main aeration pipe, and serves to supply air to the jet aerator 40 as a main air source. The jet circulation pump 30 is provided outside the aeration tank 11 and connected to the lower portion of the jet aerator 40 through an aeration auxiliary pipe. The jet aerator 400 is installed at the bottom of the aeration tank 11 for efficiently aerating wastewater to be treated. The packing member 50 is provided in the aeration tank 11 at the middle upper portion thereof, and serves as a main carrier for oxidation reaction of wastewater during aeration, and catalyzes oxidation of wastewater to enhance oxidation effect. The nanophotonic photocatalytic device 70 is used for generating hydroxyl radicals to further oxidize the wastewater to improve the oxidation efficiency of the wastewater. The nano-photon photocatalytic device 70 is disposed in the filler member 50 at the middle and lower portions, so that on one hand, the device is prevented from falling off or being displaced by being directly impacted by the wastewater flow and the air flow, and on the other hand, the contact time of hydroxyl radicals and the wastewater is also facilitated to be increased, and the oxidation effect is enhanced.
As shown in fig. 3, the packing member 50 is composed of a packing 51 and a net housing 52. The net housing 52 has a net shape and has an overall shape that matches the shape of the location of the aeration tank 11. This configuration allows the wastewater to pass completely freely into and out of the packing member 50, allowing the packing to be in full contact with the wastewater for catalytic oxidation of the wastewater.
The packing 51 is a spherical catalytic oxidation packing, and the packing percentage (i.e., the percentage of the spherical catalytic oxidation packing 51 to the inner volume of the net housing 52) is 60%. The filler is a nano copper-cobalt catalyst, and specifically comprises 12% of copper, 8% of cobalt and 80% of aluminum oxide. The particle size of the filler is 2.5-25 nm.
The water intake lift pump 10 is provided outside the aeration tank 101 for sucking wastewater to be treated to the aeration tank 11. When the equipment 1 for high-efficiency aeration of wastewater is in normal operation, the water inlet lifting pump 10 is in a normally open state. The water outlet tank 12 can be combined with the aeration tank 11. The water outlet tank 12 is used as a water outlet tank and a temporary storage tank overflowed from the aeration tank 11. The water outlet lift pump 60 is disposed outside the water outlet tank 102 as a power source for the external water discharge to discharge the water in the water outlet tank 102.
In addition, valves and/or flow meters can be arranged on the main aeration pipeline and the auxiliary aeration pipeline, and the valves and/or the flow meters are respectively used for controlling and measuring air inlet or liquid inlet quantity. Valves and/or flow meters may also be provided on the pipes of the water intake lift pump 10 connected to the aeration tank 11 and on the pipes of the water outlet lift pump 60 connected to the water outlet tank 12 for controlling and measuring the water intake and water output, respectively.
Example 2
In this example, a method of efficiently performing aeration oxidation of waste water by using the above-described apparatus 1 is described in detail by taking flue gas washing waste water from a certain incineration plant as an example. Wherein the main reducing substance of the wastewater to be treated is inorganic sulfite, according to the following chemical reaction principle: SO 3 2-+O2→SO4 2 the COD of the wastewater was reduced by oxidizing the reducing substance sulphite in the wastewater to sulphate by high efficiency aeration oxidation using the apparatus 1 of example 1. Wherein the packing 51 of the packing member 50 is the same as in embodiment 1.
Specifically, the high-efficiency aeration method of the wastewater comprises the following steps:
(1) The COD of the wastewater inlet of the aeration tank 11 to be treated is measured to be 2000, the required oxygen amount is calculated to be 200m 3/h, the oxygenation efficiency of the fan 20 is calculated to be 20%, the air inflow of the fan 20 is set to be 1000m 3/h, and the air inflow of the fan 20 is adjusted according to the COD of the wastewater outlet of the aeration tank 11 after treatment until the COD is reduced to be below a preset value (400 mg/L).
(2) When the COD of the wastewater effluent of the aeration tank 11 is higher than 400mg/L, the jet circulation pump 30 is started to further enhance the aeration effect, so that the COD of the wastewater effluent is kept below 400 mg/L;
(3) When the COD of the wastewater inlet water of the aeration tank 11 to be treated becomes abnormally high, and the COD of the wastewater outlet water cannot be kept below 400mg/L by aeration through the fan 20 and the jet circulation pump 30, the nano photon photocatalytic device 70 is started, and the wastewater is oxidized through hydroxyl radicals generated by the nano photon photocatalytic device to further improve the oxidation effect of the wastewater, so that the COD of the wastewater outlet water is kept below 400 mg/L; or alternatively
The COD of the wastewater inlet water is not changed greatly, but the COD standard of the wastewater outlet water is modified to be not higher than 200mg/L, the COD of the wastewater outlet water cannot be kept below 200mg/L by aeration through the fan 20 and the jet circulation pump 30, the nano photon photocatalytic device 70 is started, and the wastewater is oxidized by the generated hydroxyl free radicals, so that the oxidation effect of the wastewater is further improved, and the COD of the wastewater outlet water is kept below 200 mg/L.
Example 3
In this example, the flue gas washing wastewater of acid waste gas is taken as an example, and the method for performing efficient aeration oxidation of wastewater by using the above-described apparatus 1 is described in detail. Wherein the main reducing substance of the wastewater to be treated is inorganic sulfite, according to the following chemical reaction principle: NO 2 -+O2→NO3 - oxidizes the reducing substance sulfite in the wastewater into sulfate radical through high-efficiency aeration oxidation, thereby reducing the COD of the wastewater. Wherein the packing 51 of the packing member 50 is the same as in embodiment 1.
Specifically, the high-efficiency aeration method of the wastewater comprises the following steps:
(1) The COD value of the wastewater inlet of the aeration tank 11 to be treated is measured to be 1500, the required oxygen amount is calculated to be 300m 3/h, the oxygenation efficiency of the fan 20 is calculated to be 20%, the air inflow of the fan 20 is set to be 1500m 3/h, and the air inflow of the fan 20 is adjusted according to the COD of the wastewater outlet of the aeration tank 11 after treatment until the COD is reduced to be below a preset value (500 mg/L).
(2) When the COD of the wastewater effluent of the aeration tank 11 is higher than 400mg/L, the jet circulation pump 30 is started to further enhance the aeration effect, so that the COD of the wastewater effluent is kept below 500 mg/L;
(3) When the COD of the wastewater inlet water of the aeration tank 11 to be treated becomes abnormally high (for example, the COD is 2500 mg/L), and the COD of the wastewater outlet water cannot be kept below 500mg/L by aeration through the fan 20 and the jet circulation pump 30, the nano photon photocatalytic device 70 is started, and the wastewater is oxidized by the generated hydroxyl free radicals, so that the oxidation effect of the wastewater is further improved, and the COD of the wastewater outlet water is kept below 500 mg/L; or alternatively
When the COD standard of the wastewater effluent is modified to be not higher than 300mg/L even though the COD of the wastewater influent is not changed much, the COD of the wastewater effluent cannot be kept below 200mg/L by aeration through the fan 20 and the jet circulation pump 30, the nano-photon photocatalytic device 70 is turned on, and the wastewater is oxidized by the generated hydroxyl radicals, so that the oxidation effect of the wastewater is further improved, and the COD of the wastewater effluent is kept below 200 mg/L.
Example 4
In this example, a method of efficiently performing aeration oxidation of waste water by using the above-described apparatus 1 is described in detail by taking flue gas washing waste water from a certain incineration plant as an example. Wherein the main reducing substance of the wastewater to be treated is inorganic sulfite, according to the following chemical reaction principle: SO 3 2-+O2→SO4 2- oxidizes the reducing substance sulfite in the wastewater into sulfate radical by high-efficiency aeration oxidation, thereby reducing the COD of the wastewater. Wherein the packing 51 of the packing member 50 is the same as in embodiment 1.
Specifically, the high-efficiency aeration method of the wastewater comprises the following steps:
(1) The COD value of the wastewater inlet of the aeration tank 11 to be treated is measured to be 1000mg/L, the required oxygen amount is calculated to be 100m 3/h, the air inflow of the fan 20 is set to be 500m 3/h according to the oxygenation efficiency of the fan 20, and the air inflow of the fan 20 is adjusted according to the COD of the wastewater outlet of the treated aeration tank 11 until the COD is reduced to be below a preset value (300 mg/L).
(2) When the COD of the wastewater effluent of the aeration tank 11 is higher than 400mg/L, the jet circulation pump 30 is started to further enhance the aeration effect, so that the COD of the wastewater effluent is kept below 300 mg/L;
(3) When the COD of the wastewater inlet water of the aeration tank 11 to be treated becomes abnormally high (for example, the COD is 2000 mg/L), the COD of the wastewater outlet water cannot be kept below 500mg/L by aeration through the fan 20 and the jet circulation pump 30, the nano photon photocatalytic device 70 is started, and the wastewater is oxidized by the generated hydroxyl free radicals, so that the oxidation effect of the wastewater is further improved, and the COD of the wastewater outlet water is kept below 300 mg/L;
or even when the COD of the wastewater inlet water is not changed greatly, but the COD standard of the wastewater outlet water is modified to be not higher than 200mg/L, when the COD of the wastewater outlet water cannot be kept below 200mg/L by aeration through the fan 20 and the jet circulation pump 30, the nano photon photocatalytic device 70 is started, and the wastewater is oxidized by the generated hydroxyl free radicals, so that the oxidation effect of the wastewater is further improved, and the COD of the wastewater outlet water is kept below 200 mg/L.
From the above description, the device for high-efficiency aeration oxidation of wastewater has simple structure, is convenient to install, operate and maintain, and solves the defects of large occupied area and low aeration efficiency of the device. Compared with other processes, the method for efficiently aerating and oxidizing the wastewater reduces the investment cost of adding auxiliary facilities into chemical components (such as ferrous sulfate and hydrogen peroxide used in Fenton oxidation and hydrogen peroxide used in hydrogen peroxide oxidation) for reducing COD and the operation cost of adding the chemical components in the production process, and simultaneously realizes stable aerating and oxidizing performance and stable control of COD of effluent of the wastewater within a preset range.
The foregoing has shown and described the basic principles and main features of the present invention and the advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (3)
1. A method for the efficient aeration and oxidation of wastewater, which is characterized by comprising the following steps:
(1) Measuring COD of wastewater inflow to be treated, calculating a required air quantity, setting the inflow amount of wastewater inflow according to oxygenation efficiency, and adjusting the inflow amount according to COD of wastewater outflow after treatment so that the COD of wastewater outflow is reduced below a preset value;
(2) When the COD of the effluent of the wastewater exceeds the preset value, the aeration effect of the wastewater under aeration is further enhanced by jet aeration, so that the COD of the effluent of the wastewater is reduced below the preset value,
Wherein, in the steps (1) and (2), the filler is used for catalytic oxidation in the wastewater aeration process;
the method further comprises further enhancing the oxidation effect by providing hydroxyl radicals to the wastewater, the hydroxyl radicals being generated by a nanophotonic photocatalytic device, when the COD standard requirement of the wastewater influent or the wastewater effluent is abnormally high and aeration does not maintain the COD of the wastewater effluent below the COD standard requirement.
2. A high efficiency aeration oxidation process according to claim 1, wherein the filler is a nano copper cobalt catalyst.
3. A high efficiency aeration oxidation process as claimed in claim 1 wherein the inlet of the wastewater feed in step (1) is provided by a fan.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911339797.7A CN110980920B (en) | 2019-12-23 | 2019-12-23 | Efficient aeration oxidation method and equipment for wastewater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911339797.7A CN110980920B (en) | 2019-12-23 | 2019-12-23 | Efficient aeration oxidation method and equipment for wastewater |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110980920A CN110980920A (en) | 2020-04-10 |
| CN110980920B true CN110980920B (en) | 2024-05-14 |
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Family Applications (1)
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