CN110980920A - Efficient aeration oxidation method and equipment for wastewater - Google Patents
Efficient aeration oxidation method and equipment for wastewater Download PDFInfo
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- CN110980920A CN110980920A CN201911339797.7A CN201911339797A CN110980920A CN 110980920 A CN110980920 A CN 110980920A CN 201911339797 A CN201911339797 A CN 201911339797A CN 110980920 A CN110980920 A CN 110980920A
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- 239000002351 wastewater Substances 0.000 title claims abstract description 159
- 238000005273 aeration Methods 0.000 title claims abstract description 97
- 238000007254 oxidation reaction Methods 0.000 title claims abstract description 67
- 230000003647 oxidation Effects 0.000 title claims abstract description 66
- 238000000034 method Methods 0.000 title claims abstract description 43
- 239000000945 filler Substances 0.000 claims abstract description 21
- 230000000694 effects Effects 0.000 claims abstract description 18
- 238000005276 aerator Methods 0.000 claims abstract description 16
- 230000003197 catalytic effect Effects 0.000 claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 55
- 238000012856 packing Methods 0.000 claims description 17
- 230000001590 oxidative effect Effects 0.000 claims description 12
- 230000001699 photocatalysis Effects 0.000 claims description 10
- 239000003054 catalyst Substances 0.000 claims description 9
- 229910017052 cobalt Inorganic materials 0.000 claims description 5
- 239000010941 cobalt Substances 0.000 claims description 5
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims description 5
- 229910052802 copper Inorganic materials 0.000 claims description 5
- 239000010949 copper Substances 0.000 claims description 5
- 238000006213 oxygenation reaction Methods 0.000 claims description 2
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 238000003912 environmental pollution Methods 0.000 abstract description 3
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 26
- 239000000126 substance Substances 0.000 description 9
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 7
- RYTYSMSQNNBZDP-UHFFFAOYSA-N cobalt copper Chemical compound [Co].[Cu] RYTYSMSQNNBZDP-UHFFFAOYSA-N 0.000 description 7
- 239000001301 oxygen Substances 0.000 description 7
- 229910052760 oxygen Inorganic materials 0.000 description 7
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 5
- 239000003638 chemical reducing agent Substances 0.000 description 5
- 239000003546 flue gas Substances 0.000 description 5
- 238000005406 washing Methods 0.000 description 5
- 238000004065 wastewater treatment Methods 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 3
- 238000006243 chemical reaction Methods 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
- 238000007146 photocatalysis Methods 0.000 description 3
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000011941 photocatalyst Substances 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- TUJKJAMUKRIRHC-UHFFFAOYSA-N hydroxyl Chemical compound [OH] TUJKJAMUKRIRHC-UHFFFAOYSA-N 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
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Classifications
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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
- C02F1/008—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
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- 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 equipment 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-photonic catalytic oxidation device. The method of the invention has the advantages of good effect of waste water aeration oxidation, small secondary environmental pollution and low energy consumption. The equipment of 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, particularly when flue gas washing wastewater is discharged, the situation that COD exceeds the standard generally exists, and the wastewater is not suitable for biochemical treatment because of high salinity, so that other simple and quick methods for removing the 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 quickly realized. For example, ferrous sulfate and hydrogen peroxide are required to be added in Fenton oxidation, and a large amount of sludge is finally generated, so that secondary pollution is caused; ozone oxidation requires a large amount of electric energy to be consumed, and secondary pollution problems can be caused; the oxidation of the hydrogen peroxide needs to add the hydrogen peroxide, but the COD of the inlet water of the wastewater to be treated is unstable, so that the adding amount of the hydrogen peroxide is not easy to control, the adding amount of the hydrogen peroxide is too small, the COD of the outlet water of the treated wastewater is too high, the adding amount of the hydrogen peroxide is too much, and the excessive adding amount is easy to increase the COD of the outlet water of the treated wastewater.
Therefore, how to effectively, economically and safely degrade the wastewater, especially the COD of the flue gas washing wastewater, in the water treatment process is a problem to be solved urgently.
Disclosure of Invention
In view of the disadvantages of the prior art wastewater treatment processes, particularly the methods used in the wastewater COD reduction treatment process, it is an object of one aspect of the present invention to provide a method for efficient aeration oxidation of wastewater. The method has the advantages of small secondary environmental pollution, low energy consumption and good wastewater treatment effect.
In order to realize the purpose of the invention, the invention adopts the following technical scheme:
a high-efficiency aeration oxidation method of waste water comprises the following steps:
(1) measuring COD of wastewater inlet water to be treated, calculating the required air amount, setting the amount of inlet air introduced into the wastewater inlet water according to oxygenation efficiency, and adjusting the amount of the inlet air according to the COD of the treated wastewater outlet water so that the COD of the wastewater outlet water is reduced to be below a preset value;
(2) when the COD of the wastewater effluent exceeds the preset value, the aeration effect of the aerated wastewater is further enhanced through jet aeration, so that the COD of the wastewater effluent is reduced to be below the preset value,
wherein, in the steps (1) and (2), the wastewater is catalyzed and oxidized by using the filler in the aeration process.
In a preferred embodiment, in the method for efficiently aerating and oxidizing wastewater of the invention, the filler is a nano copper-cobalt catalyst. In a preferred embodiment, the copper cobalt catalyst comprises 12% copper, 8% cobalt, 80% alumina. In a preferred embodiment, the particle size of the copper cobalt catalyst is 2.5 to 25 nm. In a preferred embodiment, the catalytic oxidation filler is spherical.
In a preferred embodiment, the method for efficiently aerating and oxidizing wastewater of the present invention further comprises when the COD of the wastewater influent is abnormally high or the COD standard requirement of the wastewater effluent is lower than the above predetermined value (for example, the COD standard of the wastewater effluent is 200mg/L), further increasing the oxidation effect by hydroxyl radicals so that the COD of the wastewater effluent meets the requirement.
In a preferred embodiment, in the method for high-efficiency aeration oxidation of wastewater according to the present invention, the hydroxyl radical is generated by a nanophotonic photocatalyst.
In a preferred embodiment, in the method for efficiently aerating and oxidizing wastewater of the present invention, the air supply for introducing wastewater influent in step (1) is provided by a blower.
It is another object of the present invention to provide an apparatus for high-efficiency aerated oxidation of wastewater, which comprises an aeration tank, at least one fan for supplying intake air to wastewater in the aeration tank, at least one jet circulation pump, at least one jet aerator, and packing, wherein the fan is disposed 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 catalytically oxidizing the wastewater in the aeration tank, and is arranged inside the aeration tank and positioned at the middle upper part.
In a preferred embodiment, the apparatus for efficient aerated oxidation of wastewater of the present invention, the packing member is composed of a packing and a mesh-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, 80% alumina. In a preferred embodiment, the particle size of the copper cobalt catalyst is 2.5 to 25 nm. In a preferred embodiment, the catalytic oxidation filler is spherical.
In a preferred embodiment, the apparatus for efficient 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 high-efficiency aeration oxidation of wastewater of the present invention, the nanophotonic catalytic oxidation device is disposed inside the packing member at a middle lower portion.
In a preferred embodiment, the device for high-efficiency aeration oxidation of wastewater of the invention further comprises a water outlet tank, and the water tank is combined with the aeration tank.
In a preferred embodiment, in the apparatus for high efficiency aerated 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 aerated oxidation of wastewater according to the present invention is 2.
In a preferred embodiment, the number of jet circulation pumps in the apparatus for high efficiency aerated oxidation of wastewater according to the present invention is 3.
The efficient aeration oxidation method of the wastewater has the advantages of good aeration oxidation effect of the wastewater, small secondary environmental pollution, low energy consumption and capability of stably controlling the COD of the wastewater.
The equipment for efficiently aerating and oxidizing the wastewater has a simple structure, is convenient to install, operate and maintain, solves the problems of large occupied area and low aerating efficiency of the conventional 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 (chemical oxygen demand) and the operation cost of continuously adding the chemical components in the production process, realizes stable aerating and oxidizing performances, and can control the COD of the effluent of the wastewater within a preset range (such as 500 mg/L).
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below.
FIG. 1 is a schematic view showing the structure of an apparatus for efficient 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 packing member of fig. 1.
Detailed Description
In the description of the present invention, "abnormally high" means that the COD of the wastewater influent over a period of time is significantly higher than the typical COD of the wastewater influent. For example, the COD of the wastewater influent is typically 800-1000 mg/L, but suddenly reaches 2000mg/L or higher within a certain period of time.
In the description of the present invention, "connected" may refer to fluid communication.
The number of the fans, the jet circulation pumps and the jet aerators of the apparatus for high-efficiency aeration oxidation of wastewater of the present invention may be plural, for example, 2, 3, 4, 5 or more, respectively. The number of the fans corresponds to that of the jet flow aerators.
The jet circulation pump of the device for the high-efficiency aeration oxidation of the wastewater is not started under normal conditions, and is started only when the COD of the output water after aeration exceeds a preset value, such as 500 mg/L.
The nano-photon catalytic oxidation device of the equipment for efficiently aerating and oxidizing the wastewater is not opened under the normal condition, and is opened only when the COD of wastewater inlet water entering the aeration tank is abnormally high or the standard of the COD of wastewater outlet water is lower than the preset value of the COD.
The invention is further illustrated with reference to the following figures and specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention.
Example 1
As shown in fig. 1 and 2, in this example, the apparatus 1 for high-efficiency aeration oxidation of wastewater includes an aeration tank 11, fans 20 (2 shown in fig. 1), jet circulation pumps 30 (3 shown in fig. 1), jet aerators 40 (2 shown in fig. 1), a packing member 50, and a nanophotonic photocatalyst apparatus 70. The equipment also comprises a water inlet lifting pump 10, an aeration tank 11, a water outlet tank 12 and a water outlet lifting pump 60.
The fan 20 is arranged outside the aeration tank, for example, in a fan room, and is connected with the upper part of the jet aerator 40 through an aeration main pipe, and is used for providing air to the jet aerator 40 as a main air source. The jet circulation pump 30 is arranged outside the aeration tank 11 and is connected with the lower part of the jet aerator 40 through an aeration auxiliary pipeline. The jet aerator 400 is installed at the bottom of the aeration tank 11 for efficiently aerating the wastewater to be treated. The packing member 50 is disposed inside the aeration tank 11 at the middle upper portion, and serves as a main carrier for an oxidation reaction of wastewater during aeration to catalytically oxidize the wastewater, thereby improving an oxidation effect. The nanophotonic catalytic device 70 is used to generate hydroxyl radicals to further oxidize the wastewater, so as to improve the oxidation efficiency of the wastewater. The nano-photon photocatalysis device 70 is arranged in the packing component 50 and is positioned at the middle lower part, so that the device is prevented from falling off or shifting due to direct impact of wastewater water flow and air flow on the one hand, and the contact time of hydroxyl radicals and wastewater is prolonged, and the oxidation effect is enhanced on the other hand.
As shown in fig. 3, the packing member 50 is composed of a packing 51 and a net-like casing 52. The mesh-shaped housing 52 has a mesh shape and has an overall shape that matches the shape of the position of the aeration tank 11. This configuration allows for the wastewater to pass completely freely into and out of the filler element 50, allowing the filler to contact the wastewater sufficiently to catalytically oxidize the wastewater.
The filler 51 is a spherical catalytic oxidation filler, and the filling ratio (i.e., the percentage of the spherical catalytic oxidation filler 51 to the internal volume of the mesh-shaped housing 52) is 60%. The filler is a nano copper-cobalt catalyst, and specifically comprises 12% of copper, 8% of cobalt and 80% of alumina. The particle size of the filler is 2.5-25 nm.
The intake lift pump 10 is provided outside the aeration tank 101 for pumping the wastewater to be treated to the aeration tank 11. When the device 1 for efficiently aerating wastewater is in normal operation, the water inlet lift 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 an overflow water outlet tank and a temporary storage tank of the aeration tank 11. The effluent lift pump 60 is disposed outside the effluent tank 102 and serves as a power source for external drainage to drain water from the effluent tank 102.
In addition, valves and/or flow meters can be arranged on the main aeration pipeline and the auxiliary aeration pipeline and are respectively provided with a device for controlling and measuring air intake or liquid intake. Valves and/or flow meters can also be arranged on the pipeline of the inlet water lift pump 10 connected with the aeration tank 11 and the pipeline of the outlet water lift pump 60 connected with the outlet water tank 12, and are respectively used for controlling and measuring the water inlet amount and the water outlet amount of the wastewater.
Example 2
In this example, the flue gas washing wastewater of a certain incineration plant is taken as an example, and a method for efficiently aerating and oxidizing the wastewater by using the above-mentioned apparatus 1 will be described in detail. Wherein the main reducing substance of the wastewater to be treated is an inorganic substance sulfite radical according to the following chemical reaction principle: SO (SO)3 2-+O2→SO4 2The reducing substance sulfite in the wastewater is oxidized into sulfate by the efficient aeration oxidation using the apparatus 1 of example 1, 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) measuring and measuring the COD of the wastewater inlet water of the aeration tank 11 to be treated to be 2000, calculating the required oxygen amount to be 200m3/h, setting the air inlet amount of the fan 20 to be 1000m3/h according to the oxygen charging efficiency of the fan 20 to be 20 percent, and adjusting the air inlet amount of the fan 20 according to the COD of the wastewater outlet water of the treated aeration tank 11 until the COD is reduced to be below a preset value (400 mg/L).
(2) When the COD of the effluent of the wastewater in 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 effluent of the wastewater 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 the aeration of the fan 20 and the jet flow circulating pump 30, the nano photon photocatalytic device 70 is started to oxidize the wastewater by the hydroxyl radicals generated by the nano photon photocatalytic device so as to further improve the oxidation effect of the wastewater and keep the COD of the wastewater outlet water below 400 mg/L; or
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 flow circulating pump 30, the nano photon photocatalysis device 70 is started, and the wastewater is oxidized through the generated hydroxyl 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 acidic exhaust gas is taken as an example, and a method for performing efficient aeration oxidation of wastewater by using the above-mentioned apparatus 1 is described in detail. Wherein the main reducing substance of the wastewater to be treated is an inorganic substance sulfite radical according to the following chemical reaction principle: NO2 -+O2→NO3 -And reducing substances sulfite in the wastewater are oxidized into sulfate radicals through efficient aeration oxidation, so that the COD of the wastewater is reduced. 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) measuring the COD value of wastewater inlet water of an aeration tank 11 to be treated to be 1500, calculating the required oxygen amount to be 300m3/h, setting the air inlet amount of a fan 20 to be 1500m3/h according to the oxygen charging efficiency of the fan 20 to be 20%, and adjusting the air inlet amount of the fan 20 according to the COD value of the wastewater outlet water of the treated aeration tank 11 until the COD value 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 2500mg/L) and the COD of the wastewater outlet water cannot be kept below 500mg/L by the aeration of the fan 20 and the jet flow circulating pump 30, the nano-photon photocatalytic device 70 is started to oxidize the wastewater by the generated hydroxyl radicals so as to further improve the oxidation effect of the wastewater and keep the COD of the wastewater outlet water below 500 mg/L; or
When the COD standard of the effluent of the wastewater is modified to be not higher than 300mg/L even when the COD of the influent wastewater is not changed greatly, the COD of the effluent of the wastewater cannot be kept below 200mg/L by the aeration of the fan 20 and the jet flow circulating pump 30, the nano-photon photocatalytic device 70 is started to oxidize the wastewater by the hydroxyl radicals generated by the nano-photon photocatalytic device, so as to further improve the oxidation effect of the wastewater, and keep the COD of the effluent of the wastewater below 200 mg/L.
Example 4
In this example, the flue gas washing wastewater of a certain incineration plant is taken as an example, and a method for efficiently aerating and oxidizing the wastewater by using the above-mentioned apparatus 1 will be described in detail. Wherein the main reducing substance of the wastewater to be treated is an inorganic substance sulfite radical according to the following chemical reaction principle: SO (SO)3 2-+O2→SO4 2-And the reducing substance sulfite in the wastewater is oxidized into sulfate radical through efficient aeration oxidation, so that the COD of the wastewater is reduced. 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 water of the aeration tank 11 to be treated is measured to be 1000mg/L, the oxygen amount required by calculation is 100m3/h, the air inlet amount of the fan 20 is set to be 500m3/h according to the oxygen charging efficiency of the fan 20 being 20 percent, and the air inlet amount of the fan 20 is adjusted according to the COD value of the wastewater outlet water of the treated aeration tank 11 until the COD value 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 2000mg/L), the COD of the wastewater outlet water cannot be kept below 500mg/L by the aeration of the fan 20 and the jet flow circulating pump 30, the nano-photon photocatalytic device 70 is started, 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 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 the aeration of the fan 20 and the jet flow circulating pump 30, the nano photon photocatalysis device 70 is started to oxidize the wastewater by the generated hydroxyl radicals, so as to further improve the oxidation effect of the wastewater, and keep the COD of the wastewater outlet water below 200 mg/L.
As can be seen from the above description, the device for efficiently aerating and oxidizing wastewater of the invention has simple structure and convenient installation, operation and maintenance, 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 for reducing 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) of COD and the operation cost of adding the chemical components in the production process, realizes stable aeration oxidation performance and realizes stable control of COD in effluent of the wastewater in a preset range.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are given by way of illustration of the principles of the present invention, and that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. A high-efficiency aeration oxidation method of wastewater is characterized by comprising the following steps:
(1) measuring COD of wastewater inlet water to be treated, calculating the required air amount, setting the amount of inlet air introduced into the wastewater inlet water according to oxygenation efficiency, and adjusting the amount of the inlet air according to the COD of the treated wastewater outlet water so that the COD of the wastewater outlet water is reduced to be below a preset value;
(2) when the COD of the wastewater effluent exceeds the preset value, the aeration effect of the aerated wastewater is further enhanced through jet aeration, so that the COD of the wastewater effluent is reduced to be below the preset value,
wherein, in the steps (1) and (2), the wastewater is catalyzed and oxidized by using the filler in the aeration process.
2. The efficient aerated oxidation process of claim 1, wherein the filler is a nano-copper cobalt catalyst.
3. The efficient aeration oxidation method according to any one of claims 1 to 2, wherein the method further comprises providing hydroxyl radicals to the wastewater to further enhance the oxidation effect when the COD of the wastewater influent is abnormally high or the COD standard requirement of the wastewater effluent is lower than the predetermined value.
4. The efficient aerated oxidation process of claim 3, wherein the hydroxyl radicals are generated by a nanophotonic photocatalytic device.
5. The efficient aeration oxidation method according to claim 1, wherein the air intake for introducing wastewater influent in step (1) is provided by a fan.
6. An apparatus for efficient aeration oxidation of wastewater, characterized in that the apparatus (1) comprises an aeration tank (11), at least one fan (20), at least one jet circulation pump (30), at least one jet aerator (40) and a filler unit (50),
wherein the blower (20) for supplying intake air to the wastewater in the aeration tank (11) is provided outside the aeration tank (11) in connection with an upper portion of the jet aerator (40),
the jet circulation pump (30) for providing jet aeration to the wastewater in the aeration tank (11) is disposed outside the aeration tank (11) and connected to a lower portion of the jet aerator (40),
the filler member (50) is used for catalytically oxidizing wastewater in the aeration tank (11), and is disposed inside the aeration tank (11) at the middle-upper portion.
7. The apparatus according to claim 6, characterized in that the filler member (50) consists of a filler (51) net-like casing (52).
8. The apparatus according to claim 7, characterized in that the filler (51) is a nano-copper cobalt catalyst.
9. An apparatus according to any one of claims 6-7, characterized in that the apparatus (1) further comprises nanophotonic catalytic oxidation means (70) for generating hydroxyl radicals for further oxidation of the wastewater in the aeration process.
10. The apparatus according to claim 9, characterized in that said nanophotonic catalytic oxidation device (70) is arranged inside said packing member (50) at a middle lower portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911339797.7A CN110980920B (en) | 2019-12-23 | Efficient aeration oxidation method and equipment for wastewater |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911339797.7A CN110980920B (en) | 2019-12-23 | Efficient aeration oxidation method and equipment for wastewater |
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| Publication Number | Publication Date |
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| CN110980920A true CN110980920A (en) | 2020-04-10 |
| CN110980920B CN110980920B (en) | 2024-05-14 |
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