CN113666579A - Sewage treatment device and control method thereof - Google Patents
Sewage treatment device and control method thereof Download PDFInfo
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- CN113666579A CN113666579A CN202111037039.7A CN202111037039A CN113666579A CN 113666579 A CN113666579 A CN 113666579A CN 202111037039 A CN202111037039 A CN 202111037039A CN 113666579 A CN113666579 A CN 113666579A
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- 238000000034 method Methods 0.000 title claims abstract description 33
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- 239000012528 membrane Substances 0.000 claims abstract description 119
- 230000001699 photocatalysis Effects 0.000 claims abstract description 118
- 238000001514 detection method Methods 0.000 claims abstract description 41
- 238000005189 flocculation Methods 0.000 claims abstract description 9
- 230000016615 flocculation Effects 0.000 claims abstract description 9
- 238000003756 stirring Methods 0.000 claims description 17
- 238000005273 aeration Methods 0.000 claims description 13
- 238000012806 monitoring device Methods 0.000 claims description 13
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 12
- 239000007788 liquid Substances 0.000 claims description 11
- 238000007146 photocatalysis Methods 0.000 claims description 10
- 239000011941 photocatalyst Substances 0.000 claims description 6
- 239000006228 supernatant Substances 0.000 claims description 6
- 239000004408 titanium dioxide Substances 0.000 claims description 6
- 239000002351 wastewater Substances 0.000 claims description 5
- 238000004065 wastewater treatment Methods 0.000 claims 1
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- 239000000463 material Substances 0.000 description 34
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- MFLKDEMTKSVIBK-UHFFFAOYSA-N zinc;2-methylimidazol-3-ide Chemical compound [Zn+2].CC1=NC=C[N-]1.CC1=NC=C[N-]1 MFLKDEMTKSVIBK-UHFFFAOYSA-N 0.000 description 16
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- XIOUDVJTOYVRTB-UHFFFAOYSA-N 1-(1-adamantyl)-3-aminothiourea Chemical compound C1C(C2)CC3CC2CC1(NC(=S)NN)C3 XIOUDVJTOYVRTB-UHFFFAOYSA-N 0.000 description 2
- LXBGSDVWAMZHDD-UHFFFAOYSA-N 2-methyl-1h-imidazole Chemical compound CC1=NC=CN1 LXBGSDVWAMZHDD-UHFFFAOYSA-N 0.000 description 2
- 229920012266 Poly(ether sulfone) PES Polymers 0.000 description 2
- 239000004695 Polyether sulfone Substances 0.000 description 2
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- 238000009792 diffusion process Methods 0.000 description 2
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
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- 150000002460 imidazoles Chemical class 0.000 description 2
- JBFYUZGYRGXSFL-UHFFFAOYSA-N imidazolide Chemical compound C1=C[N-]C=N1 JBFYUZGYRGXSFL-UHFFFAOYSA-N 0.000 description 2
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- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 2
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- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
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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
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/18—Water
-
- 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
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
- C02F1/32—Treatment of water, waste water, or sewage by irradiation with ultraviolet light
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
-
- 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
- C02F1/50—Treatment of water, waste water, or sewage by addition or application of a germicide or by oligodynamic treatment
-
- 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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
-
- 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
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
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- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Biochemistry (AREA)
- Immunology (AREA)
- Physics & Mathematics (AREA)
- Analytical Chemistry (AREA)
- Food Science & Technology (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Medicinal Chemistry (AREA)
- Pathology (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
- Physical Water Treatments (AREA)
Abstract
The invention discloses a sewage treatment device and a control method thereof, belonging to the technical field of sewage treatment. The apparatus of the present invention comprises: the device comprises a grid flocculation tank (1) and a biological treatment tank (2) which are sequentially connected, wherein an outlet of the biological treatment tank (2) is connected with the lower part of a photocatalytic tank (4) through a first pump (3), and the first pump (3) conveys sewage from the biological treatment tank (2) to the photocatalytic tank (4); the top of the photocatalytic tank (4) is communicated with a second pump (5), the inlet of the second pump (5) is positioned at the upper part of the photocatalytic tank (4), the outlet of the second pump (5) is connected with a first water quality detection device (11), and the outlet of the first water quality detection device (11) is connected with a first water outlet valve (16); the device also comprises a third pump (6) for conveying the sewage of the photocatalytic tank (4) to the membrane treatment tank (7).
Description
Technical Field
The invention relates to a sewage treatment device and a control method thereof, belonging to the technical field of sewage treatment.
Background
The sewage treatment is an important aspect of environmental protection, various sewage treatment methods exist in the prior art, such as a microbial treatment method and the like, but for the wastewater with higher pollution degree, such as printing and dyeing wastewater and the like, because more refractory organic matters exist, the common biological treatment is difficult to complete the purification, so that the drainage is difficult to reach the standard. The purification of the wastewater which is difficult to treat is a problem to be solved urgently in the field.
Disclosure of Invention
Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.
In order to solve the existing problems, the invention provides a sewage treatment device and a control method thereof, and the technical scheme is as follows:
in one aspect, the present invention provides a sewage treatment apparatus, comprising:
the device comprises a grid flocculation tank and a biological treatment tank which are sequentially connected, wherein an outlet of the biological treatment tank is connected with the lower part of a photocatalytic tank through a first pump, and the first pump conveys sewage from the biological treatment tank to the photocatalytic tank;
the top of the photocatalytic tank is communicated with a second pump, the inlet of the second pump is positioned at the upper part of the photocatalytic tank, the outlet of the second pump is connected with a first water quality detection device, and the outlet of the first water quality detection device is connected with a first water outlet valve;
the device also comprises a third pump, wherein an inlet of the third pump is connected to the lower part of the photocatalytic tank, an outlet of the third pump is connected to the membrane treatment tank, and the third pump is suitable for conveying sewage of the photocatalytic tank to the membrane treatment tank when the first water quality detection device displays that the water quality is unqualified.
According to the embodiment of the invention, the photocatalytic tank can be used for removing organic pollutants in water by oxidation, so that the deep purification of water quality is realized; however, part of pollutants which are difficult to remove by catalytic oxidation may exist in the effluent of the biological pond, so that the effluent of the second pump is unqualified. In addition, in order to improve the treatment efficiency, a physical filtering device such as a filter screen and the like can be arranged in front of the photocatalytic tank to carry out coarse filtration on water, so that the treatment load of the photocatalytic tank and the membrane treatment tank is reduced.
It should be emphasized that the membrane treatment tank needs to be arranged at the downstream of the photocatalytic tank, if the membrane treatment tank is arranged in front, the membrane is easy to block, the cost of the membrane component is high, the treatment difficulty and the cost are greatly increased, and the membrane treatment tank is arranged at the rear part of the photocatalytic tank and is only used under the condition that the photocatalytic tank cannot ensure the water quality, so the treatment cost can be greatly reduced.
Optionally, an outlet of the membrane treatment tank is connected with a second water quality detection device, and a first outlet of the second water quality detection device is connected with a second water outlet valve.
Optionally, a second outlet of the second water quality detection device is connected to the bottom of the photocatalytic tank through a fourth pump, and the fourth pump is adapted to deliver water to the photocatalytic tank when the second water quality detection device indicates that the water quality is not qualified.
According to the embodiment of the invention, the second water quality monitoring device is arranged at the outlet of the membrane treatment tank, so that the qualified effluent of the membrane treatment tank can be ensured. When quality of water is unqualified, water flows back to the photocatalytic tank, photocatalytic oxidation is circularly carried out, the treatment time is prolonged, so that partial pollutants can be further removed, the treated water is led into the membrane treatment tank again for treatment, and the sewage treatment effect can be greatly improved by repeating the process.
Optionally, a plurality of groups of ultraviolet lamp tubes are arranged in the photocatalytic pool, and titanium dioxide photocatalysts are laid on the outer surfaces of the ultraviolet lamp tubes.
Optionally, the lower part of photocatalysis pond is equipped with aeration equipment, aeration equipment is suitable for to be in first water quality testing device shows that the work under the unqualified condition of quality of water to with sewage stirring mixing in the photocatalysis pond.
According to the embodiment of the invention, because the ultraviolet lamp tube is arranged at the upper part of the photocatalytic tank, part of pollutants are possibly distributed at the lower part of the photocatalytic tank and cannot be treated, the water is stirred and uniformly mixed by the aeration device, so that the condition can be avoided, and the treatment effect is improved.
Optionally, a membrane module is arranged in the membrane treatment tank, and the membrane module comprises an anti-pollution filter membrane.
According to the embodiment of the invention, the anti-pollution membrane can be used for greatly avoiding the phenomena of blockage and the like caused by membrane pollution, reducing the replacement frequency of the membrane component and reducing the operation cost.
Optionally, the preparation method of the anti-pollution filter membrane comprises the following steps:
preparing and forming an NPC-Ag composite material;
blending an NPC-Ag composite into a membrane material to form the anti-contamination membrane.
NPC is called Nanoporous carbon, NPC is English abbreviation of nano porous carbon, Ag is silver, and NPC-Ag is defined as a composite of the nano porous carbon and the silver. The derivative porous carbon (MOF) is a novel adsorption material which is popularized at present and can combine the excellent structure of a metal organic framework material with the excellent adsorption performance of a carbon material. Among them, Zeolitic Imidazoles (ZIFs) framework materials are an important branch of metal organic framework materials. At present, nano silver is the most commonly used bactericide, but nano silver with small particle size is easy to agglomerate and is slowly released too fast, the antibacterial effect is greatly reduced, and meanwhile, the nano silver and a membrane material have weaker bonding effect and are easy to fall off. Therefore, the inventor finds that the surface of nitrogen-containing Nano Porous Carbon (NPC) obtained by carbonizing a representative substance ZIF-8 in the zeolite imidazole ester material at high temperature as a precursor has a plurality of organic bonds, so that the carrier acting on Ag is more tightly combined with the organic bonds on the surface of the membrane material, and the Ag ions can be prevented from falling off from the surface of the membrane material, so that the pollution resistance of the membrane material can be prevented from being reduced; meanwhile, the distribution of Ag is more uniform due to the super-large specific surface area of NPC, so that after NPC-Ag is blended with the membrane material, Ag can be uniformly distributed on the surface of the membrane material, the anti-pollution performance of the membrane material is balanced and stable, and the anti-pollution capacity of the membrane material is ensured.
In the above preparation process, the process of preparing and forming the NPC-Ag composite further includes:
preparing to form NPC powder;
mixing the NPC powder with the AgNO3 solution to form a mixed solution, carrying out light treatment on the mixed solution by using a high-pressure mercury lamp, centrifuging, drying and grinding the mixed solution after the treatment of the high-pressure mercury lamp to obtain the NPC-Ag composite material.
The high-pressure mercury lamp is a high-pressure mercury vapor discharge lamp with the inner surface of the glass shell coated with fluorescent powder, and through irradiation treatment of the mixed liquid, compared with an ultraviolet lamp, the high-pressure mercury lamp can emit ultraviolet rays with partial long wavelength, so that efficient and stable reduction of Ag + to Ag0 can be realized.
Further, mixing the NPC powder with the AgNO3 solution to form a mixed solution comprising: putting NPC powder into a container, adding pure water and performing ultrasonic treatment, then adding methanol (MeOH) to improve the dispersion degree of the NPC powder in a liquid phase, then adding AgNO3 solution, stirring the container away from light to enable Ag + to be fully and uniformly adsorbed on the surface and in a pore structure of a porous carbon carrier, and then realizing stable photoreduction under the irradiation of a high-pressure mercury lamp.
The aforementioned process for preparing NPC-forming powder specifically includes:
preparing and forming ZIF-8 precursor powder;
carbonizing the ZIF-8 precursor powder to form the NPC powder.
ZIF-8 referred to herein is (Zeolite Imidazolate Frameworks).
The process for preparing the ZIF-8 precursor powder specifically includes:
dissolving zinc nitrate hexahydrate in anhydrous methanol with stirring to form a first methanol solution;
adding 2-methylimidazole to anhydrous methanol to form a second methanol solution;
and dropwise adding the second methanol solution into the first methanol solution, stirring and mixing to form a mixed methanol solution, magnetically stirring at room temperature for 10 hours, dropwise adding the organic ligand while stirring, and fully extending the ligand chain segment between metal centers formed by zinc nitrate to form the porous framework material with a more stable spatial structure. And centrifuging and drying the mixed methanol solution to obtain the ZIF-8 precursor powder.
The carbonizing the ZIF-8 precursor powder to form the NPC powder specifically includes: and (3) placing the semi-cylindrical quartz boat filled with the ZIF-8 precursor powder in a tube furnace for calcining at 900 ℃, keeping the temperature for 8 hours at the heating rate of 5 ℃/min under the protection of nitrogen, and naturally cooling to obtain the NPC powder.
The blending of the NPC-Ag composite material into a membrane material to form the anti-pollution membrane specifically comprises:
adding the NPC-Ag composite material into an organic solvent N, N-Dimethylformamide (DMF), stirring to uniformly disperse the NPC-Ag composite material, adding a certain amount of polyether sulfone (PES), heating and dissolving in an oven at 60 ℃, and then stirring on a magnetic stirrer for overnight; taking out every other day, continuously placing the membrane into an oven, standing for 24h to remove micro bubbles in the membrane casting solution, so that the pore diameter structure of the membrane formed by solvent diffusion to water and PES curing is more perfect, and the generation of pores is reduced. After the preparation of the membrane casting solution is finished, naturally placing the membrane casting solution until the membrane casting solution is cooled to room temperature, pouring the membrane casting solution on non-woven fabrics in sequence, uniformly scraping the membrane casting solution by using a glass rod, standing the membrane casting solution at room temperature for a certain time, quickly immersing the glass plate paved with the non-woven fabrics into gel bath such as pure water and the like, and adjusting the standing time and the gel bath composition to effectively regulate and control the pore size and the structure of the membrane. And curing to form a film with uniform thickness, and continuously soaking for 24h to ensure that the phase inversion is complete.
The invention also provides a control method of the sewage treatment device, which comprises the following steps:
the method comprises the following steps: controlling sewage to sequentially enter a grid flocculation tank and a biological treatment tank;
step two: controlling a first pump to start, and conveying the sewage from the biological treatment tank to the lower part of the photocatalytic tank;
step three: controlling an ultraviolet light tube of the photocatalytic tank to work for a first preset time, wherein a titanium dioxide photocatalyst is laid on the ultraviolet light tube;
step four: controlling a second pump connected with the upper part of the photocatalytic tank to start and convey the supernatant of the photocatalytic tank to a first water quality detection device;
step five: and determining the water quality displayed by the first water quality detection device, and controlling the first water outlet valve to be opened when the first water quality detection device displays that the water quality is qualified.
Optionally, the control method further includes: when the first water quality monitoring device displays that the water quality is unqualified, the first water outlet valve and the second pump are controlled to be closed, the aeration device positioned at the bottom of the photocatalytic tank is controlled to work for a second preset time, then the third pump connected to the lower part of the photocatalytic tank is controlled to be started, and the liquid positioned at the lower part of the photocatalytic tank is conveyed to the membrane treatment tank.
Optionally, the control method further includes: and when the second water quality detection device connected with the outlet of the photocatalytic tank displays that the water quality is qualified, controlling a second water outlet valve connected with the first outlet of the second water quality detection device to open for water drainage.
Optionally, the control method further includes: and when the second water quality detection device displays that the water quality is unqualified, controlling the second water outlet valve and the third pump to be closed, and controlling a fourth pump connected with a second outlet of the second water quality detection device to be started so as to enable the water in the membrane treatment tank to flow back to the bottom of the photocatalytic tank.
Optionally, the control method further includes: and when the liquid level of the photocatalytic tank is reduced to a preset liquid level, controlling the second pump, the third pump and the fourth pump to stop working, and controlling the first pump to start.
The invention has the beneficial effects that:
according to the sewage treatment device, the photocatalytic tank can be used for removing organic pollutants in water through oxidation, so that the deep purification of water quality is realized; but part of pollutants which are difficult to remove by catalytic oxidation can also exist in the effluent of the biological pond, so that the effluent of the second pump is unqualified; therefore, the device is provided with the membrane treatment tank, when the water pumped out by the second pump is unqualified, the water in the photocatalytic tank is transferred into the membrane treatment tank, and pollutants in the water are removed by membrane filtration and the like, so that the qualified effluent is ensured. In addition, in order to improve the treatment efficiency, a physical filtering device such as a filter screen and the like can be arranged in front of the photocatalytic tank to carry out coarse filtration on water, so that the treatment load of the photocatalytic tank and the membrane treatment tank is reduced.
According to the sewage treatment device, the ultraviolet lamp tube is arranged at the upper part of the photocatalytic tank, so that part of pollutants are distributed at the lower part of the photocatalytic tank to cause the condition that the pollutants cannot be treated, the water is stirred and uniformly mixed by the aeration device, the condition can be avoided, and the treatment effect is improved.
According to the sewage treatment device, the membrane treatment tank is arranged at the downstream of the photocatalytic tank, if the membrane treatment tank is arranged in front, the membrane is easy to block, so that the device cannot work, and the cost of the membrane component is high, so that the treatment difficulty and the treatment cost are greatly increased; the membrane treatment tank is arranged at the rear part of the photocatalytic tank and is only used under the condition that the photocatalytic tank cannot ensure water quality, so that the treatment cost can be greatly reduced.
According to the sewage treatment device, the pollution-resistant membrane can be used for greatly avoiding the phenomena of blockage and the like caused by membrane pollution, the replacement frequency of the membrane component is reduced, and the operation cost is further reduced.
According to the control method of the sewage treatment device, when the first water quality detection device displays that the water quality is unqualified, the sewage with heavy pollution at the lower part of the photocatalytic tank is conveyed to the membrane treatment tank; and, when setting up in the second water quality monitoring device of the export of membrane treatment pond and detecting quality of water unqualified, with the water reflux to the photocatalysis pond, the circulation carries out the photocatalytic oxidation, extension treatment time, thereby further get rid of partial pollutant, and the water after will handling is directed into the membrane treatment pond again and is handled, repeat this flow, with sewage circulation treatment between membrane treatment pond and photocatalysis pond, discharge after the sewage of lower part is up to standard, can greatly improve sewage treatment effect, decompose the pollutant completely, reach water purification's purpose.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic view showing the construction of a sewage treatment apparatus according to the present invention;
FIG. 2 is a flowchart of a control method of the sewage treatment apparatus of the present invention.
Description of reference numerals: 1. a grid flocculation tank; 2. a biological treatment tank; 3. a first pump; 4. a photocatalytic cell; 41. an aeration device; 42. an ultraviolet lamp tube; 5. a second pump; 6. a third pump; 7. a membrane treatment tank; 71. an anti-contamination film; 8. a water outlet pipe of the membrane treatment tank; 9. a second water outlet pipe; 11. a first water quality monitoring device; 12. a second pump water inlet pipe; 13. a fourth pump; 14. a second water quality monitoring device; 16. a first outlet valve; 17. a second water outlet valve.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
The first embodiment is as follows:
reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present application and should not be construed as limiting the present application.
The present embodiment discloses a sewage treatment apparatus, which combines the schematic structural diagram of the apparatus shown in fig. 1, and the apparatus includes:
the device comprises a grid flocculation tank 1 and a biological treatment tank 2 which are sequentially connected, wherein the outlet of the biological treatment tank 2 is connected with the lower part of a photocatalytic tank 4 through a first pump 3, and the first pump 3 conveys sewage from the biological treatment tank 2 to the photocatalytic tank 4; the sewage is conveyed to the lower part of the photocatalytic tank 4 through the first pump 3, so that the liquid level can rise stably;
the top of the photocatalytic tank 4 is communicated with a second pump 5, the inlet of the second pump 5 is positioned at the upper part of the photocatalytic tank 4, the outlet of the second pump 5 is connected with a first water quality detection device 11, and the outlet of the first water quality detection device 11 is connected with a first water outlet valve 16; therefore, the supernatant in the photocatalytic tank 4 is conveyed out of the photocatalytic tank through the second pump 5, so that the quality of the effluent is ensured.
The device also comprises a third pump 6, wherein the inlet of the third pump 6 is connected to the lower part of the photocatalytic tank 4, the outlet of the third pump 6 is connected to the membrane treatment tank 7, and the third pump 6 is suitable for conveying the sewage of the photocatalytic tank 4 to the membrane treatment tank 7 when the first water quality detection device 11 shows that the water quality is unqualified.
So, when first water quality monitoring device 11 shows that quality of water is unqualified, the supernatant quality of photocatalytic tank 4 is not up to standard promptly, can confirm that the quality of water of photocatalytic tank 4 is all ineligible, and the quality of water of 4 lower parts of photocatalytic tank is more not up to standard, consequently, will be located the relatively poor water quality of 4 lower parts of photocatalytic tank and carry out advanced treatment to membrane treatment tank 7, can effectively solve the poor problem of 4 quality of water in photocatalytic tank to guarantee final water quality of water.
The photocatalytic tank can oxidize and remove organic pollutants in water, so that the deep purification of water quality is realized; however, part of pollutants which are difficult to remove by catalytic oxidation may exist in the effluent of the biological pond, so that the effluent of the second pump is unqualified. In some alternative embodiments, in order to improve the treatment efficiency, a physical filtering device, such as a filter screen, may also be arranged in front of the photocatalytic tank to perform coarse filtration on the water, so as to reduce the treatment load of the photocatalytic tank and the membrane treatment tank.
In some embodiments, the outlet of the membrane treatment tank 7 is connected to the second water quality detection device 14, and the first outlet of the second water quality detection device 14 is connected to the second water outlet valve 17; a second outlet of the second water quality detecting device 14 is connected with the bottom of the photocatalytic tank 4 through a fourth pump 13, and the fourth pump 13 is adapted to convey water to the photocatalytic tank 4 when the second water quality detecting device 14 indicates that the water quality is not qualified.
Thus, the second water quality monitoring device 14 is arranged at the outlet of the membrane treatment tank 7, and the qualified effluent of the membrane treatment tank can be ensured. When water quality is unqualified, water flows back to the photocatalytic tank 3, photocatalytic oxidation is circularly carried out, the treatment time is prolonged, so that partial pollutants can be further removed, the treated water is led into the membrane treatment tank 7 again for treatment, and the sewage treatment effect can be greatly improved by repeating the process.
In some embodiments, multiple sets of uv tubes 42 are disposed within the photocatalytic cell 4, and the outer surface of the uv tubes is coated with a titanium dioxide photocatalyst. Of course, in alternative embodiments, the photocatalytic device may take other forms so long as the photocatalytic oxidation effect is achieved.
In some embodiments, the lower portion of the photocatalytic tank 4 is provided with an aeration device 41, and the aeration device 41 is adapted to work under the condition that the first water quality detection device shows that the water quality is not qualified, so as to stir and mix the sewage in the photocatalytic tank. Therefore, when the water quality in the photocatalytic tank 4 is unqualified, the water in the photocatalytic tank 4 needs to be deeply treated, and is conveyed to the membrane treatment tank after being uniformly mixed, so that the possibility that the membrane component is blocked due to overhigh local pollutant concentration can be reduced.
In addition, because the ultraviolet lamp tube is arranged at the upper part of the photocatalytic tank 4, part of pollutants are possibly distributed at the lower part of the photocatalytic tank 4 to cause that the pollutants cannot be treated, the water is stirred and uniformly mixed by the aeration device, so that the condition can be avoided, and the treatment effect is improved.
In some alternative embodiments, a membrane module is provided in the membrane treatment tank 7, and the membrane module comprises an anti-contamination filter membrane 71.
In the embodiment, the anti-pollution membrane can be used for greatly avoiding the phenomena of blockage and the like caused by membrane pollution, reducing the replacement frequency of the membrane component and reducing the operation cost.
In this example, the preparation method of the anti-contamination filter membrane is as follows:
preparing and forming an NPC-Ag composite material;
blending an NPC-Ag composite into a membrane material to form the anti-contamination membrane.
NPC is called Nanoporous carbon, NPC is English abbreviation of nano porous carbon, Ag is silver, and NPC-Ag is defined as a composite of the nano porous carbon and the silver. The derivative porous carbon (MOF) is a novel adsorption material which is popularized at present and can combine the excellent structure of a metal organic framework material with the excellent adsorption performance of a carbon material. Among them, Zeolitic Imidazoles (ZIFs) framework materials are an important branch of metal organic framework materials. At present, nano silver is the most commonly used bactericide, but nano silver with small particle size is easy to agglomerate and is slowly released too fast, the antibacterial effect is greatly reduced, and meanwhile, the nano silver and a membrane material have weaker bonding effect and are easy to fall off. Therefore, the inventor finds that the surface of nitrogen-containing Nano Porous Carbon (NPC) obtained by carbonizing a representative substance ZIF-8 in the zeolite imidazole ester material at high temperature as a precursor has a plurality of organic bonds, so that the carrier acting on Ag is more tightly combined with the organic bonds on the surface of the membrane material, and the Ag ions can be prevented from falling off from the surface of the membrane material, so that the pollution resistance of the membrane material can be prevented from being reduced; meanwhile, the distribution of Ag is more uniform due to the super-large specific surface area of NPC, so that after NPC-Ag is blended with the membrane material, Ag can be uniformly distributed on the surface of the membrane material, the anti-pollution performance of the membrane material is balanced and stable, and the anti-pollution capacity of the membrane material is ensured.
Wherein, preparing and forming the NPC-Ag composite material comprises:
preparing to form NPC powder;
mixing the NPC powder with the AgNO3 solution to form a mixed solution, carrying out light treatment on the mixed solution by using a high-pressure mercury lamp, centrifuging, drying and grinding the mixed solution after the treatment of the high-pressure mercury lamp to obtain the NPC-Ag composite material.
The high-pressure mercury lamp is a high-pressure mercury vapor discharge lamp with the inner surface of the glass shell coated with fluorescent powder, and through irradiation treatment of the mixed liquid, compared with an ultraviolet lamp, the high-pressure mercury lamp can emit ultraviolet rays with partial long wavelength, so that efficient and stable reduction of Ag + to Ag0 can be realized.
Further, mixing the NPC powder with the AgNO3 solution to form a mixed solution comprising: putting NPC powder into a container, adding pure water and performing ultrasonic treatment, then adding methanol (MeOH) to improve the dispersion degree of the NPC powder in a liquid phase, then adding AgNO3 solution, stirring the container away from light to enable Ag + to be fully and uniformly adsorbed on the surface and in a pore structure of a porous carbon carrier, and then realizing stable photoreduction under the irradiation of a high-pressure mercury lamp.
The foregoing preparation forms an NPC powder comprising:
preparing and forming ZIF-8 precursor powder;
carbonizing the ZIF-8 precursor powder to form the NPC powder.
ZIF-8 referred to herein is (Zeolite Imidazolate Frameworks)
The preparing forms a ZIF-8 precursor powder, comprising:
dissolving zinc nitrate hexahydrate in anhydrous methanol with stirring to form a first methanol solution;
adding 2-methylimidazole to anhydrous methanol to form a second methanol solution;
and dropwise adding the second methanol solution into the first methanol solution, stirring and mixing to form a mixed methanol solution, magnetically stirring at room temperature for 10 hours, dropwise adding the organic ligand while stirring, and fully extending the ligand chain segment between metal centers formed by zinc nitrate to form the porous framework material with a more stable spatial structure. And centrifuging and drying the mixed methanol solution to obtain the ZIF-8 precursor powder.
The carbonizing the ZIF-8 precursor powder to form the NPC powder includes: and (3) placing the semi-cylindrical quartz boat filled with the ZIF-8 precursor powder in a tube furnace for calcining at 900 ℃, keeping the temperature for 8 hours at the heating rate of 5 ℃/min under the protection of nitrogen, and naturally cooling to obtain the NPC powder.
The blending of the NPC-Ag composite into a membrane material to form the anti-contamination membrane comprises:
adding the NPC-Ag composite material into an organic solvent N, N-Dimethylformamide (DMF), stirring to uniformly disperse the NPC-Ag composite material, adding a certain amount of polyether sulfone (PES), heating and dissolving in an oven at 60 ℃, and then stirring on a magnetic stirrer for overnight; taking out every other day, continuously placing the membrane into an oven, standing for 24h to remove micro bubbles in the membrane casting solution, so that the pore diameter structure of the membrane formed by solvent diffusion to water and PES curing is more perfect, and the generation of pores is reduced. After the preparation of the membrane casting solution is finished, naturally placing the membrane casting solution until the membrane casting solution is cooled to room temperature, pouring the membrane casting solution on non-woven fabrics in sequence, uniformly scraping the membrane casting solution by using a glass rod, standing the membrane casting solution at room temperature for a certain time, quickly immersing the glass plate paved with the non-woven fabrics into gel bath such as pure water and the like, and adjusting the standing time and the gel bath composition to effectively regulate and control the pore size and the structure of the membrane. And curing to form a film with uniform thickness, and continuously soaking for 24h to ensure that the phase inversion is complete.
In the present embodiment, the anti-contamination membrane manufactured by the above method has a greatly reduced possibility of clogging due to contamination of the membrane.
Example two
The embodiment discloses a specific control method of a sewage treatment device provided by the embodiment.
In this embodiment, with reference to the flowchart shown in fig. 2, the control method includes the following steps:
the method comprises the following steps: controlling sewage to sequentially enter a grid flocculation tank and a biological treatment tank; includes step S11: and (3) feeding water, wherein S12 water enters a grid flocculation tank, S13: water enters a biological treatment pool; the water enters the biological treatment tank for preliminary treatment, and most of organic matters and inorganic matters are removed.
Step two (S14): controlling a first pump to start, and conveying the sewage from the biological treatment tank to the lower part of the photocatalytic tank; the effluent of the biological treatment tank, such as a microbial reaction tank, can hardly reach the corresponding standard, for example, the printing and dyeing wastewater contains more organic matters, so the effluent can contain pollutants which are difficult to biodegrade, and after the part of water is led into the photocatalytic tank, the pollutants which are difficult to biodegrade can be removed by utilizing the photocatalytic action, so that the effluent can reach the standard.
Step three (S15): controlling an ultraviolet light tube of the photocatalytic tank to start, wherein a titanium dioxide photocatalyst is laid on the ultraviolet light tube; after the first preset time, the process proceeds to step four (S16): controlling a second pump 5 connected with the upper part of the photocatalytic tank 4 to start and convey the supernatant of the photocatalytic tank 4 to a first water quality detection device 11;
step five (S17): and (4) determining that the first water quality monitoring device shows that the water quality is qualified, then entering the step S18, and entering the step S21 when the first water quality monitoring device shows that the water quality is unqualified.
S18: and controlling the first water outlet valve to open.
S21: and controlling the first water outlet valve and the second pump to be closed, and entering S22.
S22: controlling an aeration device positioned at the bottom of the photocatalytic tank to start, and after a second preset time, entering step S23;
first water quality testing device connects the supernatant of photocatalysis pond 4, if this part of quality of water is not up to standard, then the quality of water in photocatalysis pond 4 is not up to standard, and at this moment, in order to guarantee the water quality, stop first pump and intake, carry out advanced treatment to the water in photocatalysis pond 4 to guarantee the water quality. Of course, in alternative embodiments, a separate reservoir may be provided, in which case the first pump may be left off, and instead the reservoir may be filled with water.
S23: controlling a third pump connected to the lower part of the photocatalytic tank to start, and conveying the liquid in the photocatalytic tank to a membrane treatment tank;
s24: determining that the water quality displayed by a second water quality monitoring device connected with the outlet of the membrane treatment tank is qualified, and entering step S25; if the second water quality monitoring device is determined to display that the water quality is unqualified, the step S31 is executed;
s25: controlling the second water outlet valve to open;
s26: after the liquid level of the photocatalytic tank is determined to reach the preset water level, the step S27 is executed;
s27: controlling the first pump to be started and controlling the third pump to be stopped;
s31: and controlling the second water outlet valve to close and controlling the fourth pump to open.
According to the control method of the sewage treatment device in the embodiment, when the first water quality detection device displays that the water quality is unqualified, the sewage with heavy pollution at the lower part of the photocatalytic tank is conveyed to the membrane treatment tank; and, when setting up in the second water quality monitoring device of the export of membrane treatment pond and detecting quality of water unqualified, with the water reflux to the photocatalysis pond, the circulation carries out the photocatalytic oxidation, extension treatment time, thereby further get rid of partial pollutant, and the water after will handling is directed into the membrane treatment pond again and is handled, repeat this flow, with sewage circulation treatment between membrane treatment pond and photocatalysis pond, discharge after the sewage of lower part is up to standard, can greatly improve sewage treatment effect, decompose the pollutant completely, reach water purification's purpose.
In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing steps of a custom logic function or process, and alternate implementations are included within the scope of the preferred embodiment of the present application in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present application.
The logic and/or steps represented in the flowcharts or otherwise described herein, e.g., an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (11)
1. An apparatus for treating wastewater, the apparatus comprising:
the device comprises a grid flocculation tank (1) and a biological treatment tank (2) which are sequentially connected, wherein an outlet of the biological treatment tank (2) is connected with the lower part of a photocatalytic tank (4) through a first pump (3), and the first pump (3) conveys sewage from the biological treatment tank (2) to the photocatalytic tank (4);
the top of the photocatalytic tank (4) is communicated with a second pump (5), the inlet of the second pump (5) is positioned at the upper part of the photocatalytic tank (4), the outlet of the second pump (5) is connected with a first water quality detection device (11), and the outlet of the first water quality detection device (11) is connected with a first water outlet valve (16);
the device also comprises a third pump (6), wherein an inlet of the third pump (6) is connected to the lower part of the photocatalytic tank (4), an outlet of the third pump (6) is connected to the membrane treatment tank (7), and the third pump (6) is suitable for conveying the sewage of the photocatalytic tank (4) to the membrane treatment tank (7) when the first water quality detection device (11) displays that the water quality is unqualified.
2. The sewage treatment device according to claim 1, wherein the outlet of the membrane treatment tank (7) is connected with a second water quality detection device (14), and the first outlet of the second water quality detection device (14) is connected with a second water outlet valve (17).
3. Sewage treatment plant according to claim 2, characterised in that the second outlet of said second water quality detection device (14) is connected to the bottom of said photocatalytic tank (4) by a fourth pump (13), said fourth pump (13) being adapted to deliver water to said photocatalytic tank (4) when said second water quality detection device (14) indicates a water quality failure.
4. The sewage treatment device according to any of the claims 1 to 3, wherein a plurality of groups of ultraviolet lamp tubes (42) are arranged in the photocatalysis pond (4), and the outer surfaces of the ultraviolet lamp tubes (42) are coated with titanium dioxide photocatalysts.
5. The sewage treatment device according to claim 4, wherein an aeration device (41) is arranged at the lower part of the photocatalytic tank (4), and the aeration device (41) is suitable for working under the condition that the first water quality detection device (11) shows that the water quality is not qualified so as to stir and mix the sewage in the photocatalytic tank (4).
6. The wastewater treatment plant according to claim 5, wherein a membrane module is arranged in the membrane treatment tank (7), and the membrane module comprises an anti-pollution filter membrane.
7. A control method of the sewage treatment apparatus according to claim 1, characterized by comprising the steps of:
the method comprises the following steps: controlling sewage to sequentially enter a grid flocculation tank (1) and a biological treatment tank (2);
step two: controlling a first pump (3) to start, and conveying the sewage from the biological treatment tank (1) to the lower part of the photocatalytic tank (2);
step three: controlling an ultraviolet light tube (42) of the photocatalytic pool (2) to work for a first preset time, wherein a titanium dioxide photocatalyst is laid on the ultraviolet light tube (42);
step four: controlling a second pump (5) connected with the upper part of the photocatalytic tank (4) to start to convey the supernatant of the photocatalytic tank (4) to a first water quality detection device (11);
step five: and determining the water quality displayed by the first water quality detection device (11), and controlling the first water outlet valve (16) to be opened when the first water quality detection device (11) displays that the water quality is qualified.
8. The control method according to claim 7, characterized by further comprising:
when the first water quality monitoring device (11) displays that the water quality is unqualified, the first water outlet valve (16) and the second pump (5) are controlled to be closed, the aeration device (41) positioned at the bottom of the photocatalytic tank (4) is controlled to work for a second preset time, then the third pump (6) connected to the lower part of the photocatalytic tank (4) is controlled to be started, and the liquid positioned at the lower part of the photocatalytic tank (4) is conveyed to the membrane treatment tank (7).
9. The control method according to claim 8, characterized by further comprising:
and determining the water quality displayed by a second water quality detection device (14) connected with the outlet of the photocatalytic tank (4), and controlling a second water outlet valve (17) connected with a first outlet of the second water quality detection device (14) to open for drainage when the second water quality detection device (14) displays that the water quality is qualified.
10. The control method according to claim 9, characterized by further comprising:
and when the second water quality detection device (14) shows that the water quality is unqualified, controlling the second water outlet valve (17) and the third pump (6) to be closed, and controlling a fourth pump (13) connected with a second outlet of the second water quality detection device (14) to be started so as to enable the water in the membrane treatment tank (7) to flow back to the bottom of the photocatalytic tank (4).
11. The control method according to any one of claims 7 to 10, characterized by further comprising:
and when the liquid level of the photocatalytic tank is reduced to a preset liquid level, the second pump (5), the third pump (6) and the fourth pump (13) are controlled to stop working, and the first pump (3) is controlled to start.
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Application publication date: 20211119 |