CN116924621A - Degradation method for sealing wastewater pollutants in aluminum anode dyeing - Google Patents
Degradation method for sealing wastewater pollutants in aluminum anode dyeing Download PDFInfo
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- 239000002351 wastewater Substances 0.000 title claims abstract description 141
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 48
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims abstract description 42
- 238000004043 dyeing Methods 0.000 title claims abstract description 40
- 239000003344 environmental pollutant Substances 0.000 title claims abstract description 39
- 231100000719 pollutant Toxicity 0.000 title claims abstract description 39
- 238000006731 degradation reaction Methods 0.000 title claims abstract description 33
- 230000015556 catabolic process Effects 0.000 title claims abstract description 32
- 238000007789 sealing Methods 0.000 title abstract description 21
- 238000004062 sedimentation Methods 0.000 claims abstract description 37
- 239000010802 sludge Substances 0.000 claims abstract description 37
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims abstract description 34
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 34
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 claims abstract description 32
- 230000001105 regulatory effect Effects 0.000 claims abstract description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 26
- 238000006243 chemical reaction Methods 0.000 claims abstract description 22
- 238000011282 treatment Methods 0.000 claims abstract description 22
- 238000007599 discharging Methods 0.000 claims abstract description 20
- 239000011790 ferrous sulphate Substances 0.000 claims abstract description 20
- 235000003891 ferrous sulphate Nutrition 0.000 claims abstract description 20
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 claims abstract description 20
- 229910000359 iron(II) sulfate Inorganic materials 0.000 claims abstract description 20
- 229910052943 magnesium sulfate Inorganic materials 0.000 claims abstract description 16
- 235000019341 magnesium sulphate Nutrition 0.000 claims abstract description 16
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims abstract description 14
- 238000005189 flocculation Methods 0.000 claims abstract description 8
- 230000016615 flocculation Effects 0.000 claims abstract description 8
- 238000001556 precipitation Methods 0.000 claims abstract description 8
- 239000006228 supernatant Substances 0.000 claims abstract description 8
- 239000003054 catalyst Substances 0.000 claims description 19
- 238000005273 aeration Methods 0.000 claims description 10
- 239000010865 sewage Substances 0.000 claims description 9
- 238000010186 staining Methods 0.000 claims description 4
- 239000000356 contaminant Substances 0.000 claims description 3
- 230000000593 degrading effect Effects 0.000 claims 3
- 229910001385 heavy metal Inorganic materials 0.000 abstract description 15
- 150000002500 ions Chemical class 0.000 abstract description 13
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 12
- 239000002957 persistent organic pollutant Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 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
- 229910052759 nickel Inorganic materials 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000010790 dilution Methods 0.000 description 2
- 239000012895 dilution Substances 0.000 description 2
- 238000009713 electroplating Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 231100000331 toxic Toxicity 0.000 description 2
- 230000002588 toxic effect Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910000990 Ni alloy Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000003321 atomic absorption spectrophotometry Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000002798 spectrophotometry method Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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
-
- 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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5281—Installations for water purification using chemical agents
-
- 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
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/722—Oxidation by peroxides
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/06—Controlling or monitoring parameters in water treatment pH
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/44—Time
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/02—Specific form of oxidant
- C02F2305/026—Fenton's reagent
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- Environmental & Geological Engineering (AREA)
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- Water Treatment By Electricity Or Magnetism (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
Abstract
The invention discloses a degradation method for sealing wastewater pollutants by aluminum anode dyeing, which comprises the following steps: collecting waste water, discharging the waste water to a UV reaction container, starting a UV lamp, adding ferrous sulfate and magnesium sulfate, regulating the pH value by sulfuric acid, adding hydrogen peroxide, closing the UV lamp after the time, adding PAC, regulating the pH value by NaOH, and adding PAM; b. flocculation precipitation: the wastewater treated in the previous step is discharged to a first sedimentation tank, after the wastewater stays, the supernatant water is discharged to a pH adjusting tank, and the lower sludge is discharged to a sludge filter press; aerating the pH adjusting tank, adjusting the pH by NaOH, adding PAM, discharging the wastewater to a second sedimentation tank, discharging the supernatant to a clean water tank after the wastewater stays, and discharging the sludge to a sludge filter press. The invention has high efficiency and low cost; after the wastewater is pretreated by the method, the chromaticity, COD value and heavy metal ion content of the wastewater are greatly reduced, and the wastewater is convenient for centralized treatment with other wastewater.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a degradation method for sealing waste water pollutants by aluminum anode dyeing.
Background
The aluminum anodic oxidation can obviously improve the corrosion resistance, the surface hardness and the wear resistance of the alloy, and the dyed aluminum product has good decorative performance and is widely applied. At present, the low-end aluminum profile is basically colored by adopting a spraying process, and the high-end aluminum profile is most commonly colored by utilizing chemical dyeing, namely, the oxide film is colored by utilizing the porosity and the chemical adsorptivity of the oxide film to adsorb various pigments, and hole sealing/sealing treatment is needed after the aluminum anode is dyed. Various processes are available for dyeing and sealing holes on aluminum anodes, and Ni is most commonly used 2+ Or Co 3+ And (5) carrying out hole sealing by hydrolysis. The waste water of the aluminum anode dyeing hole sealing has high pollutant content, generally tens of thousands of chromaticity, COD value as high as several grams per liter and contains heavy metal ion Co 2+ Or Ni 2+ . It is difficult to treat such waste water by conventional treatment methods. Because the wastewater contains more heavy metal ions, the wastewater cannot be subjected to biochemical treatment. The common amount of the aluminum anode dyeing hole sealing wastewater is smaller, and the wastewater amount of a single enterprise is about 1 ton/day. The decolorizing treatment difficulty of the aluminum anode dyeing hole sealing wastewater is very high, common enterprises treat the wastewater according to dangerous waste,the cost of the treatment outside the commission exceeds 5000 yuan/ton, and the cost is high. For enterprises generating the wastewater, an efficient and low-cost treatment method is used for pretreating the aluminum anode dyeing hole sealing wastewater, and after the content of corresponding pollutants in the wastewater is reduced, the wastewater is convenient to be treated together with other wastewater.
Disclosure of Invention
The invention aims to provide a degradation method for aluminum anode dyeing closed wastewater pollutants. The invention has high efficiency and low cost; after the pretreatment of the aluminum anode dyeing closed wastewater, the chromaticity, COD value and heavy metal ion content of the wastewater are greatly reduced, and the wastewater is convenient for centralized treatment with other wastewater.
The technical scheme of the invention is as follows: a degradation method for sealing waste water pollutants in aluminum anode dyeing comprises the following steps,
a. UV/Fenton treatment: after the wastewater is collected, measuring the COD value, discharging the wastewater to a UV reaction container, starting a UV lamp, calculating the dosage of ferrous sulfate and hydrogen peroxide according to the COD value, adding ferrous sulfate and catalyst magnesium sulfate, regulating the pH of the wastewater to 1-6 by sulfuric acid, adding hydrogen peroxide until the UV lamp is started for 0.5-24 hours, closing the UV lamp, adding a catalyst PAC, regulating the pH of the wastewater to 3-10 by NaOH, and adding PAM;
b. flocculation precipitation: the wastewater treated by the UV reaction vessel is discharged to a first sedimentation tank, the wastewater stays for 0.5 to 15 hours, the supernatant of the first sedimentation tank is discharged to a pH adjusting tank, an aeration device is arranged in the pH adjusting tank, and sludge at the lower part of the first sedimentation tank is discharged to a sludge filter press; after the sewage is collected by the pH value regulating tank, an aeration device is started, the pH value of the sewage is regulated to 5-12 by NaOH, PAM is added, the sewage is discharged to a second sedimentation tank, the sewage stays for 0.5-15h, the supernatant of the second sedimentation tank is discharged to a clean water tank, and the sludge at the lower part of the second sedimentation tank is discharged to a sludge press filter.
In the degradation method for the aluminum anode dyeing closed wastewater pollutants, in the step a, after ferrous sulfate and a catalyst magnesium sulfate are added, the pH of the wastewater is adjusted to 2-5 by sulfuric acid.
In the degradation method for sealing the wastewater pollutants by the aluminum anode dyeing, in the step a, after the catalyst PAC is added, naOH is used for adjusting the pH value of the wastewater to 4-9.
In the degradation method for the sealing wastewater pollutants in the anodic aluminum staining, in the step a, the ferrous sulfate is FeSO 4 ·7H 2 O, the FeSO 4 ·7H 2 The calculation formula of the O consumption is as follows: n=m×COD, where n is Kg/t, m is 0.1-3, and COD is g/L; the hydrogen peroxide is 27% hydrogen peroxide by mass, and the calculation formula of the 27% hydrogen peroxide is as follows: x=y×COD, wherein x is L/t, y is 7-14, and COD is g/L.
In the degradation method for the sealing wastewater pollutants in the aluminum anode dyeing, in the step a, the value range of m is 0.2-0.3, and the value range of y is 8-11.
In the degradation method for the aluminum anode dyeing closed wastewater pollutants, in the step a, the mass ratio of the catalyst magnesium sulfate to the ferrous sulfate is 0.1-10:1; the amount of PAC catalyst is 50-2000g/t.
In the degradation method for the aluminum anode dyeing closed wastewater pollutants, in the step a, the mass ratio of the catalyst magnesium sulfate to the ferrous sulfate is 0.2-1:1; the amount of the catalyst PAC is 100-500g/t.
In the degradation method for the aluminum anode dyeing closed wastewater pollutants, in the step a, after hydrogen peroxide is added, the UV lamp is turned on for 1.5-5 hours, and then is turned off.
In the degradation method for the aluminum anode dyeing closed wastewater pollutants, in the step b, after the wastewater treated by the UV reaction vessel is discharged to a first sedimentation tank, the wastewater stays for 2-4 hours; and (5) after the wastewater is discharged to a second sedimentation tank, staying for 2-4h.
In the degradation method for the aluminum anode dyeing closed wastewater pollutants, in the step b, after an aeration device is started, naOH is used for adjusting the pH value of the wastewater to 7-11.
In the degradation method for the aluminum anode dyeing closed wastewater pollutants, after the sludge is collected by the sludge press filter, the press filtration is started, the dry sludge filtered by the sludge press filter is additionally treated, and the clean water filtered by the sludge press filter is discharged to the first sedimentation tank.
In the degradation method for the aluminum anode dyeing closed wastewater pollutants, the input amount of the PA M is the conventional amount.
In the degradation method for the aluminum anode dyeing closed wastewater pollutants, the equipment used for the UV/Fenton treatment comprises a collecting tank, a UV reaction container, a UV lamp and a medicine storage tank. The collecting tank is used for collecting wastewater.
In the degradation method for the aluminum anode dyeing closed wastewater pollutants, the flocculation precipitation equipment comprises a first sedimentation tank, a pH adjusting tank, a second sedimentation tank, a sludge filter press, a clean water tank and an aeration device, wherein the aeration device is arranged in the pH adjusting tank.
Compared with the prior art, the invention has the beneficial effects that:
the UV/Fenton method has high-efficiency and rapid degradation capability on organic pollutants in the aluminum anode dyeing closed wastewater, has remarkable catalytic effect on degradation of organic pollutants and heavy metal ions in the wastewater in the presence of magnesium sulfate, and has better effect on removing the color of the wastewater. After the UV/Fenton treatment and one-time flocculation precipitation, the chromaticity of the wastewater is reduced by more than 99 percent, and most of organic pollutants and heavy metal ions in the wastewater are removed. Under the action of the catalyst PAC, the reduction of the contents of heavy metal ions and organic pollutants in the wastewater after the secondary flocculation precipitation can be further promoted, and meanwhile, the chromaticity of the wastewater is completely removed. After degradation treatment by the invention: the content of heavy metal ions can meet Ni in the 'electroplating pollutant emission standard' (GB 21900-2008) 2+ The highest emission limit value is not more than 0.1mg/L, or Ni meeting the highest emission limit value requirement in the emission standard of copper, cobalt and nickel industrial pollution sources (GB 25467-2010) 2+ The content of the heavy metals in the wastewater is not more than 0.5mg/L, the total cobalt content is not more than 1.0mg/L, and the heavy metal content in the wastewater meets the standard of standard emission; COD value is lower than 300mg/L; the wastewater becomes colorless and transparent, and the color completely disappears. In addition, the invention can reduce the adding amount of ferrous sulfate, thereby reducing the final sludge amount; no toxic and harmful gas is released during the treatment process, and no toxic and harmful gas is releasedNew contaminants are introduced. The invention has high efficiency and low cost; after the pretreatment of the aluminum anode dyeing closed wastewater, the chromaticity, COD value and heavy metal ion content of the wastewater are greatly reduced, and the wastewater is convenient for centralized treatment with other wastewater.
Drawings
FIG. 1 is a degradation flow chart of an embodiment of the present invention.
Detailed Description
The invention is further illustrated by the following figures and examples, which are not intended to be limiting.
Example 1. Degradation method for sealing wastewater pollutants in aluminum anode dyeing
Certain company aluminum anode dyeing sealing wastewater with water quantity of 1m 3 And/d. The effective volume of the collecting tank is 1.5m 3 The method comprises the steps of carrying out a first treatment on the surface of the The effective volume of the UV reaction vessel was 1.5m 3 。
(1) UV/Fenton treatment
After collecting enough wastewater, the collecting tank discharges the wastewater to a UV reaction container;
after collecting enough wastewater, the collecting tank analyzes and determines pollutant indexes such as COD, chromaticity, heavy metal ion content and the like of the wastewater; calculating the required adding amount of ferrous sulfate, magnesium sulfate and hydrogen peroxide according to the measured COD value (COD is 4606 mg/L) of the wastewater;
the UV reaction vessel is started to turn on a UV lamp after collecting enough wastewater; after the UV lamp was turned on, 1.72kg of ferrous sulfate (FeSO) 4 ·7H 2 O) and 184g of magnesium sulfate; after the addition of ferrous sulfate and magnesium sulfate is completed, sulfuric acid is added into the UV reaction container to adjust the pH value of the wastewater to be between 2 and 5; after the pH value is regulated, 43.5L of 27 mass percent hydrogen peroxide is added into the UV reaction container; the UV lamp is continuously started for 3 hours; after the starting time of the UV lamp is over, 200g of catalyst PAC is added, and NaOH is added into the UV reaction container to adjust the pH value of the wastewater to between 5 and 7; after the pH value is regulated, adding a proper amount of PAM into a UV reaction container; after PAM is added, discharging the wastewater to a first sedimentation tank;
(2) Flocculation precipitation
The residence time of the wastewater in the first sedimentation tank is 4 hours; after the residence time of the wastewater in the first sedimentation tank is finished, discharging supernatant to a pH value regulating tank; after the residence time of the wastewater in the first sedimentation tank is finished, discharging the lower sludge to a sludge press filter;
after the pH value regulating tank collects enough wastewater, starting an aeration device; adding a proper amount of PAM into a pH value regulating tank; after PAM is added, naOH is added into a pH value regulating tank to regulate the pH value of the wastewater to 9-11; after the pH value in the pH value regulating tank is regulated, discharging the wastewater to a second sedimentation tank;
the residence time of the wastewater in the second sedimentation tank is 4 hours; after the residence time of the wastewater in the second sedimentation tank is finished, discharging upper clear water to a clear water tank, and discharging lower sludge to a sludge filter press;
after collecting enough sludge, the sludge filter press carries out filter pressing; the dry sludge filtered by the sludge filter press is treated separately; and discharging clear water filtered by the sludge filter press to a first sedimentation tank.
After collecting enough clean water in the clean water tank, analyzing the main pollutant content of the clean water in the clean water tank, as shown in table 1:
TABLE 1 wastewater pollutant variation
Note that:
the chromaticity of the invention is measured by adopting a dilution fold method (HJ 1182-2021);
the measurement of the chemical oxygen demand adopts HJ 828-2017;
cobalt was measured using 5-chloro-2- (pyridinazo) -1, 3-diaminobenzene spectrophotometry (HJ 550-2015).
Clear water in the clear water pond is analyzed to obtain COD Cr The color of the wastewater is changed into colorless and transparent. Heavy metal ion Co in wastewater 2+ 、Ni 2+ Also significantly reduced. Meets the requirement of carrying out subsequent biochemical treatment after pretreatment of the sealing wastewater of the aluminum anode dyeing. The degradation process of the present invention is shown in FIG. 1.
Example 2. Degradation method for sealing wastewater pollutants in aluminum anode dyeing
Certain company aluminum anode dyeing sealing wastewater with water quantity of 1.5m 3 And/d. The effective volume of the collecting tank is 2m 3 The method comprises the steps of carrying out a first treatment on the surface of the The effective volume of the UV reaction vessel was 2m 3 。
(1) UV/Fenton treatment
After collecting enough wastewater, the collecting tank discharges the wastewater to a UV reaction container;
after collecting enough wastewater, the collecting tank analyzes and determines pollutant indexes such as COD, chromaticity, heavy metal ion content and the like of the wastewater; calculating the required adding amount of ferrous sulfate, magnesium sulfate and hydrogen peroxide according to the measured COD value (COD=3705 mg/L) of the wastewater;
the UV reaction vessel is started to turn on a UV lamp after collecting enough wastewater; after the UV lamp was turned on, 2.0kg of ferrous sulfate (FeSO) 4 ·7H 2 O) and 200g of magnesium sulfate; after the addition of ferrous sulfate and magnesium sulfate is completed, sulfuric acid is added into the UV reaction container to adjust the pH value of the wastewater to be between 2 and 5; after the pH value is regulated, 48.9L of 27 mass percent hydrogen peroxide is added into a UV reaction container; after the pH value is adjusted, the UV lamp is continuously started for 4 hours;
after the starting time of the UV lamp is over, 100g of catalyst PAC is added, and NaOH is added into the UV reaction container to adjust the pH value of the wastewater to between 6 and 9; after the pH value is regulated, adding a proper amount of PAM into a UV reaction container; after PAM is added, discharging the wastewater to a first sedimentation tank;
(2) Flocculation precipitation
The residence time of the wastewater in the first sedimentation tank is 4 hours; after the residence time of the wastewater in the first sedimentation tank is finished, discharging supernatant to a pH value regulating tank; after the residence time of the wastewater in the first sedimentation tank is finished, discharging the lower sludge to a sludge press filter;
after the pH value regulating tank collects enough wastewater, starting an aeration device; adding a proper amount of PAM into a pH value regulating tank; after PAM is added, naOH is added into a pH value regulating tank to regulate the pH value of the wastewater to between 10 and 12; after the pH value in the pH value regulating tank is regulated, discharging the wastewater to a second sedimentation tank;
the residence time of the wastewater in the second sedimentation tank is 4 hours; after the residence time of the wastewater in the second sedimentation tank is finished, discharging upper clear water to a clear water tank, and discharging lower sludge to a sludge filter press;
after collecting enough sludge, the sludge filter press carries out filter pressing; the dry sludge filtered by the sludge filter press is treated separately; and discharging clear water filtered by the sludge filter press to a first sedimentation tank.
After collecting enough clean water in the clean water tank, the main pollutant content of the clean water in the clean water tank is analyzed, as shown in table 2:
TABLE 2 wastewater pollutant variation
Note that:
in the invention, the chromaticity is measured by adopting a dilution fold method (HJ 1182-2021);
the measurement of the chemical oxygen demand adopts HJ 828-2017;
nickel was measured by flame atomic absorption spectrophotometry (GB/T11912-1989).
Clear water in the clear water pond is analyzed to obtain COD Cr The value is greatly reduced, the chromaticity is reduced, and the color of the wastewater is changed into colorless and transparent. Heavy metal ion Ni in waste water 2+ The content of the nickel alloy powder meets the requirement that the maximum discharge limit of the total nickel specified in the 'electroplating pollutant discharge standard (GB 21900-2008)' Table 3 is not higher than 0.1 mg/L. Meets the requirement of carrying out other subsequent treatments after the pretreatment of the aluminum anode dyeing closed wastewater.
Of course, the present invention is capable of other various embodiments and its several details are capable of modification and variation in light of the present invention, as will be apparent to those skilled in the art, without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A method for degrading a closed wastewater pollutant for aluminum anode dyeing, which is characterized by comprising the following steps: comprises the steps of,
a. UV/Fenton treatment: after the wastewater is collected, measuring the COD value, discharging the wastewater to a UV reaction container, starting a UV lamp, calculating the dosage of ferrous sulfate and hydrogen peroxide according to the COD value, adding ferrous sulfate and catalyst magnesium sulfate, regulating the pH of the wastewater to 1-6 by sulfuric acid, adding hydrogen peroxide until the UV lamp is started for 0.5-24 hours, closing the UV lamp, adding a catalyst PAC, regulating the pH of the wastewater to 3-10 by NaOH, and adding PAM;
b. flocculation precipitation: the wastewater treated by the UV reaction vessel is discharged to a first sedimentation tank, the wastewater stays for 0.5 to 15 hours, the supernatant of the first sedimentation tank is discharged to a pH adjusting tank, an aeration device is arranged in the pH adjusting tank, and sludge at the lower part of the first sedimentation tank is discharged to a sludge filter press; after the sewage is collected by the pH value regulating tank, an aeration device is started, the pH value of the sewage is regulated to 5-12 by NaOH, PAM is added, the sewage is discharged to a second sedimentation tank, the sewage stays for 0.5-15h, the supernatant of the second sedimentation tank is discharged to a clean water tank, and the sludge at the lower part of the second sedimentation tank is discharged to a sludge press filter.
2. The degradation method for aluminum anode dyeing closed wastewater pollutants according to claim 1, wherein: in the step a, after ferrous sulfate and magnesium sulfate serving as catalysts are added, the pH value of the wastewater is adjusted to 2-5 by sulfuric acid.
3. The degradation method for aluminum anode dyeing closed wastewater pollutants according to claim 1, wherein: in step a, after the catalyst PAC is added, the pH of the wastewater is adjusted to 4-9 by NaOH.
4. The degradation method for aluminum anode dyeing closed wastewater pollutants according to claim 1, wherein: in the step a, the ferrous sulfate is FeSO 4 ·7H 2 O, the FeSO 4 ·7H 2 The calculation formula of the O consumption is as follows: n=m×COD, where n is Kg/t, m is 0.1-3, and COD is g/L; the hydrogen peroxide is 27% hydrogen peroxide by mass, and the calculation formula of the 27% hydrogen peroxide is as follows: x=y×COD, wherein x is L/t, y is 7-14, and COD is g/L.
5. The method for degrading an aluminum anode staining seal wastewater contaminant according to claim 4, wherein: in the step a, the value range of m is 0.2-0.3, and the value range of y is 8-11.
6. The degradation method for aluminum anode staining closed wastewater pollutants according to claim 4 or 5, wherein: in step a, the catalyst magnesium sulfate: the mass ratio of the ferrous sulfate is 0.1-10:1, a step of; the amount of PAC catalyst is 50-2000g/t.
7. The method for degrading an aluminum anode staining seal wastewater contaminant according to claim 6, wherein: in the step a, the mass ratio of the catalyst magnesium sulfate to the ferrous sulfate is 0.2-1:1; the amount of the catalyst PAC is 100-500g/t.
8. The degradation method for aluminum anode dyeing closed wastewater pollutants according to claim 1, wherein: in the step a, after hydrogen peroxide is added, the UV lamp is turned on for 1.5-5 hours, and then turned off.
9. The degradation method for aluminum anode dyeing closed wastewater pollutants according to claim 1, wherein: in the step b, after the wastewater treated by the UV reaction vessel is discharged to a first sedimentation tank, the wastewater stays for 2 to 4 hours; and (5) after the wastewater is discharged to a second sedimentation tank, staying for 2-4h.
10. The degradation method for aluminum anode dyeing closed wastewater pollutants according to claim 1, wherein: in step b, after the aeration device is started, the pH of the wastewater is adjusted to 7-11 by NaOH.
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