CN112707531A - Method for treating polyvinyl alcohol in wastewater - Google Patents
Method for treating polyvinyl alcohol in wastewater Download PDFInfo
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- CN112707531A CN112707531A CN201911019309.4A CN201911019309A CN112707531A CN 112707531 A CN112707531 A CN 112707531A CN 201911019309 A CN201911019309 A CN 201911019309A CN 112707531 A CN112707531 A CN 112707531A
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- wastewater
- polyvinyl alcohol
- persulfate
- oxidant
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- 239000004372 Polyvinyl alcohol Substances 0.000 title claims abstract description 81
- 229920002451 polyvinyl alcohol Polymers 0.000 title claims abstract description 81
- 239000002351 wastewater Substances 0.000 title claims abstract description 75
- 238000000034 method Methods 0.000 title claims abstract description 32
- 239000007800 oxidant agent Substances 0.000 claims abstract description 26
- 230000001590 oxidative effect Effects 0.000 claims abstract description 24
- JRKICGRDRMAZLK-UHFFFAOYSA-L persulfate group Chemical group S(=O)(=O)([O-])OOS(=O)(=O)[O-] JRKICGRDRMAZLK-UHFFFAOYSA-L 0.000 claims abstract description 18
- 238000003756 stirring Methods 0.000 claims abstract description 13
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 11
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims abstract description 10
- 238000006243 chemical reaction Methods 0.000 claims abstract description 9
- 239000000203 mixture Substances 0.000 claims abstract description 9
- 239000012286 potassium permanganate Substances 0.000 claims abstract description 7
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 claims description 16
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 claims description 11
- LCPVQAHEFVXVKT-UHFFFAOYSA-N 2-(2,4-difluorophenoxy)pyridin-3-amine Chemical group NC1=CC=CN=C1OC1=CC=C(F)C=C1F LCPVQAHEFVXVKT-UHFFFAOYSA-N 0.000 claims description 10
- CHQMHPLRPQMAMX-UHFFFAOYSA-L sodium persulfate Substances [Na+].[Na+].[O-]S(=O)(=O)OOS([O-])(=O)=O CHQMHPLRPQMAMX-UHFFFAOYSA-L 0.000 claims description 10
- 229910001870 ammonium persulfate Inorganic materials 0.000 claims description 8
- 230000035484 reaction time Effects 0.000 claims description 2
- 230000003647 oxidation Effects 0.000 abstract description 2
- 238000007254 oxidation reaction Methods 0.000 abstract description 2
- 239000000243 solution Substances 0.000 description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 19
- 239000007864 aqueous solution Substances 0.000 description 12
- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid group Chemical group S(O)(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 10
- 238000012360 testing method Methods 0.000 description 5
- 238000002835 absorbance Methods 0.000 description 4
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 4
- 239000004327 boric acid Substances 0.000 description 4
- 239000003153 chemical reaction reagent Substances 0.000 description 4
- 238000005070 sampling Methods 0.000 description 4
- DKNPRRRKHAEUMW-UHFFFAOYSA-N Iodine aqueous Chemical compound [K+].I[I-]I DKNPRRRKHAEUMW-UHFFFAOYSA-N 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- NLKNQRATVPKPDG-UHFFFAOYSA-M potassium iodide Chemical compound [K+].[I-] NLKNQRATVPKPDG-UHFFFAOYSA-M 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000004065 wastewater treatment Methods 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000007865 diluting Methods 0.000 description 2
- 238000010790 dilution Methods 0.000 description 2
- 239000012895 dilution Substances 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000006260 foam Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 239000004753 textile Substances 0.000 description 2
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 238000006136 alcoholysis reaction Methods 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000012482 calibration solution Substances 0.000 description 1
- 230000002860 competitive effect Effects 0.000 description 1
- -1 construction Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000001804 emulsifying effect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000012847 fine chemical Substances 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000000543 intermediate Substances 0.000 description 1
- 239000011630 iodine Substances 0.000 description 1
- 229910052740 iodine Inorganic materials 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000008239 natural water Substances 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000012086 standard solution Substances 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—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
-
- 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
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/34—Organic compounds containing oxygen
Abstract
The invention belongs to the technical field of oxidation treatment of wastewater, and particularly relates to a method for treating polyvinyl alcohol in wastewater. The method comprises the following steps: adjusting the pH value of the wastewater containing polyvinyl alcohol to 2-4, then adding iron powder and stirring; and then adding an oxidant solution into the wastewater for reaction, wherein the oxidant is persulfate or a composition of the persulfate and hydrogen peroxide and/or potassium permanganate. The method can obviously reduce the content of the polyvinyl alcohol in the wastewater, has high treatment efficiency on the polyvinyl alcohol, and has a removal rate of 90.6-93 percent.
Description
Technical Field
The invention belongs to the technical field of oxidation treatment of wastewater, and particularly relates to a method for treating polyvinyl alcohol in wastewater.
Background
Polyvinyl alcohol (PVA) is the only polymer which is found to be water-soluble and non-toxic, and has properties between those of plastics and rubber. Polyvinyl alcohol has unique characteristics of strong adhesion, gas barrier property, wear resistance, emulsifying property, film forming property, better oil and grease resistance, solvent resistance and the like, and is widely applied to the fields of textiles, foods, medicines, construction, wood processing, paper making, printing, agriculture, metallurgy, high polymer chemical industry, biological engineering and the like ("production profile and application of polyvinyl alcohol", soyame and the like, fine chemical raw materials and intermediates, 2009, 9 th, page 11, left column, 1 st section, lines 1, 6, published, 12, month 31; "research and production of high polymerization degree polyvinyl alcohol", zhang yu university, huadong chii university thesia, 2012, page 1, 4 th sections, lines 1, 3, 5, 6, lines 3, 6, published, 12, month 31, 2012).
However, polyvinyl alcohol has good water solubility, and a large amount of waste water containing polyvinyl alcohol is generated during use. The conditions of the textile and embroidery industry are the most prominent, and the generated polyvinyl alcohol wastewater is large in amount and high in concentration. However, polyvinyl alcohol is a typical refractory organic substance, and organic contaminants composed of polyvinyl alcohol are high in concentration and hardly biodegradable (B/C less than 0.1). After wastewater containing polyvinyl alcohol is discharged into a water body, polyvinyl alcohol is accumulated in the water environment in a large amount, so that foams on the surface of the water body are increased, the viscosity is increased, the activity of aerobic microorganisms is influenced, and the natural water body is not easily reoxygenated, thereby causing serious environmental problems (the adsorption and competitive adsorption performance of expanded graphite on environmental pollutants, Jujuan, the university of Hebei, Souchi academic thesis, 2011, 3 rd to 5 th lines of the abstract, and published 2011, 11 th and 29 th days).
Disclosure of Invention
In view of the above, the present invention is directed to a method for treating polyvinyl alcohol in wastewater, which has a good effect of treating polyvinyl alcohol.
In order to achieve the purpose, the technical scheme of the invention is as follows:
the method for treating polyvinyl alcohol in wastewater comprises the following steps:
adjusting the pH value of the wastewater containing polyvinyl alcohol to 2-4, then adding iron powder and stirring; and then adding an oxidant solution into the wastewater for reaction, wherein the oxidant is persulfate or a composition of the persulfate and hydrogen peroxide and/or potassium permanganate.
Further, the pH of the wastewater containing polyvinyl alcohol is adjusted to 3 to 4.
Further, the reagent used for adjusting the pH of the wastewater is a sulfuric acid solution, a nitric acid solution or hydrochloric acid.
Further, the dosage of the iron powder is 0.1-0.5% of the mass of the wastewater.
Further, the dosage of the oxidant solution is that the mass ratio of the oxidant contained in the solution to the polyvinyl alcohol contained in the wastewater is 1:1-8: 1.
Further, the mass fraction of the oxidant in the oxidant solution is 20% -40%.
Further, the persulfate is sodium persulfate, potassium persulfate or ammonium persulfate.
Further, the content of the persulfate in the composition is more than or equal to 90 wt%.
Further, the oxidant solution is added under stirring.
Further, the reaction temperature is 10-50 ℃, and the reaction time is 30-60 min.
Further, the stirring time is 15-30min, and the rotating speed is 200-600 r/min.
Further, the method comprises the following steps:
adjusting the pH value of the wastewater containing polyvinyl alcohol to 3-4, then adding iron powder with the mass of 0.1-0.5% of the wastewater, and stirring for 15-30min at the rotation speed of 200-600 r/min; then adding an oxidant solution with the mass fraction of 20-40% into the wastewater to react for 30-60min at the temperature of 10-50 ℃, wherein the oxidant is persulfate or a composition of persulfate and hydrogen peroxide and/or potassium permanganate; the dosage of the oxidant solution is that the mass ratio of the oxidant contained in the solution to the polyvinyl alcohol contained in the wastewater is 1:1-8: 1; the persulfate is sodium persulfate, potassium persulfate or ammonium persulfate; the content of the persulfate in the composition is more than or equal to 90 wt%.
The invention has the beneficial effects that:
the method can obviously reduce the content of the polyvinyl alcohol in the wastewater, has high treatment efficiency on the polyvinyl alcohol, and has a removal rate of 90.6-93 percent.
The method can effectively oxidize and degrade PVA in the wastewater into micromolecular substances which are easy to be degraded biologically, and avoids the impact on a sewage treatment system caused by the sludge wrapped by the PVA-containing wastewater discharged into the sewage treatment system and the generation of a large amount of foam.
The method can be carried out at normal temperature and low temperature, and reduces the energy consumption of wastewater treatment.
The method of the invention has short wastewater treatment time and greatly reduces the specification of wastewater treatment equipment.
The method of the invention does not adopt toxic and harmful medicaments and is environment-friendly.
The method of the invention is used for treating the wastewater at normal temperature and normal pressure, has no special requirements on equipment and operators, and is easy for industrialization.
Detailed Description
The examples are provided for better illustration of the present invention, but the present invention is not limited to the examples. Therefore, those skilled in the art should make insubstantial modifications and adaptations to the embodiments of the present invention in light of the above teachings and remain within the scope of the invention.
The following methods for detecting the content of polyvinyl alcohol (when the sample volume is 5ml, the colorimetric light path is 16mm, the detection limit is 0.20mg/L, and the measurement range is 2.0-36.0mg/L) are as follows:
the instrument comprises the following steps: 10ml graduated test tube, 5ml pipette, 2ml pipette, 1ml pipette, spectrophotometer.
Reagent: 100mg/L PVA calibration solution (0.1000 g PVA (3.1.1) is accurately weighed, a proper amount of pure water is added, heating and dissolving are carried out, after cooling, water is added for dilution to 1L, and mixing is carried out), PVA calibration material (about 20g dry PVA with higher alcoholysis degree in our factory is taken, after being repeatedly cleaned by pure water and filtered to remove impurities, the PVA calibration material is put into a weighing bottle and dried in a drying oven with the temperature of 105 and 110 ℃ for 4h, after being taken out, the PVA calibration material is put into a drier for cooling to the room temperature for standby), 40g/L boric acid solution (40 g boric acid is weighed and dissolved in 1000ml pure water for mixing) is carried out, and iodine-potassium iodide solution (12.7 g sublimed iodine and 25g potassium iodide are weighed and dissolved.
The operation steps (the water sample meeting particulate matters is heated to be dissolved and is cooled to room temperature for testing, and the water sample meeting dirt or dark color is filtered for testing):
drawing a standard curve: respectively sucking 0.00 mL, 0.10 mL, 0.20 mL, 0.40 mL, 0.60 mL, 0.80 mL, 1.00 mL, 1.20 mL, 1.40 mL and 1.60mL of PVA standard solution into 10mL graduated test tubes, adding 2.00mL of boric acid solution and 0.5mL of iodine-potassium iodide solution, diluting with water to the graduation, shaking uniformly, measuring the absorbance at 640nm by using a 1cm cuvette and taking a reagent blank as a reference, and drawing a standard curve by taking the absorbance as a vertical coordinate and the PVA concentration as a horizontal coordinate;
and (3) sample determination: adding 2.00mL of boric acid solution and 0.5mL of iodine-potassium iodide solution into a 10mL graduated test tube of 5.00mL of water sample, diluting to the graduation with water, shaking uniformly, measuring the absorbance at 640nm by using a 1cm cuvette and taking a reagent blank as a reference.
Calculation of results
The PVA mass concentration in the water sample PVA (mg/L) was calculated as follows: PVA content, mg/L-reading x dilution times; where the reading is the concentration of absorbance of the sample corresponding to the standard curve.
Example 1
The method for treating the polyvinyl alcohol in the wastewater comprises the following specific steps:
A. putting 200g of wastewater (the content of polyvinyl alcohol is 5000mg/L) into a three-neck flask, placing the three-neck flask in a 30 ℃ constant-temperature water bath, keeping the temperature constant for 30min, adding a sulfuric acid solution into the wastewater to adjust the pH to 3, adding 0.1g of iron powder into the wastewater, starting a stirrer, and stirring for 15min at the rotating speed of 300 r/min;
B. preparing 1g of potassium persulfate into a potassium persulfate aqueous solution with the concentration of 20 percent by weight;
C. adding the potassium persulfate aqueous solution into the wastewater obtained in the step A at the rotating speed of 300r/min, and reacting at the constant temperature of 30 ℃ at the rotating speed of 300r/min for 1 h; wherein the dosage of the potassium persulfate aqueous solution is that the mass ratio of potassium persulfate contained in the solution to polyvinyl alcohol contained in the wastewater is 1: 1.
After the reaction is finished, sampling and detecting the content of the polyvinyl alcohol in the wastewater, wherein the content of the polyvinyl alcohol is 333mg/L through detection, namely the content of the polyvinyl alcohol in the wastewater is reduced from 5000mg/L to 333mg/L, and the PVA removal rate reaches 93%.
Example 2
The method for treating the polyvinyl alcohol in the wastewater comprises the following specific steps:
A. putting 200g of wastewater (the content of polyvinyl alcohol is 5000mg/L) into a three-neck flask, placing the three-neck flask in a constant-temperature water bath at 20 ℃ for constant temperature 30min, adding a sulfuric acid solution into the wastewater to adjust the pH to 4, adding 0.1g of iron powder into the wastewater, starting a stirrer, and stirring at the rotating speed of 300r/min for 15 min;
B. preparing 2g of sodium persulfate into a sodium persulfate aqueous solution with the concentration of 20 percent;
C. adding the sodium persulfate aqueous solution into the wastewater obtained in the step A at the rotating speed of 300r/min, and reacting at the constant temperature of 20 ℃ at the rotating speed of 300r/min for 1 h; wherein the amount of the sodium persulfate aqueous solution is 2:1 by mass of the sodium persulfate contained in the solution and the polyvinyl alcohol contained in the wastewater.
After the reaction is finished, sampling and detecting the content of the polyvinyl alcohol in the wastewater, wherein the content of the polyvinyl alcohol is 412mg/L through detection, namely the content of the polyvinyl alcohol in the wastewater is reduced from 5000mg/L to 412mg/L, and the PVA removal rate reaches 91.7%.
Example 3
The method for treating the polyvinyl alcohol in the wastewater comprises the following specific steps:
A. 200g of wastewater (the content of polyvinyl alcohol is 500mg/L) is taken and placed in a three-neck flask in a 30 ℃ constant temperature water bath for 30min, sulfuric acid solution is added into the wastewater to adjust the pH to 3, 0.2g of iron powder is added into the wastewater, a stirrer is started, and the wastewater is stirred for 15min at the rotating speed of 300 r/min;
B. 0.5g of ammonium persulfate is prepared into a sodium persulfate aqueous solution with the concentration of 20 percent;
C. adding ammonium persulfate aqueous solution into the wastewater at the rotating speed of 300r/min, and continuously stirring and reacting for 1h at the constant temperature of 30 ℃ at the rotating speed of 300 r/min; wherein the use amount of the ammonium persulfate aqueous solution is 5:1 of the mass ratio of the ammonium persulfate contained in the solution to the polyvinyl alcohol contained in the wastewater.
After the reaction is finished, sampling and detecting the content of the polyvinyl alcohol in the wastewater, wherein the content of the polyvinyl alcohol is detected to be 36mg/L, namely the content of the polyvinyl alcohol in the wastewater is reduced from 500mg/L to 36mg/L, and the removal rate of the PVA reaches 92.8%.
Example 4
The method for treating the polyvinyl alcohol in the wastewater comprises the following specific steps:
A. taking 200g of wastewater (the content of polyvinyl alcohol is 300mg/L), placing the wastewater in a three-neck flask, keeping the temperature in a constant-temperature water bath at 30 ℃ for 30min, adding a sulfuric acid solution into the wastewater to adjust the pH to 3, adding 0.3g of iron powder into the wastewater, starting a stirrer, and stirring at the rotating speed of 300r/min for 15 min;
B. dissolving 0.2g of potassium persulfate and 0.1g of potassium permanganate in 0.18g of water to prepare an oxidant aqueous solution with the concentration of 20 percent;
C. adding the oxidant aqueous solution into the wastewater at the rotating speed of 300r/min, and continuously stirring and reacting for 1h at the constant temperature of 30 ℃ at the rotating speed of 300 r/min; wherein the mass ratio of the total amount of potassium persulfate and potassium permanganate contained in the oxidant aqueous solution to polyvinyl alcohol contained in the wastewater is 8: 1.
After the reaction is finished, sampling and detecting the content of the polyvinyl alcohol in the wastewater, wherein the content of the polyvinyl alcohol is detected to be 28mg/L, namely the content of the polyvinyl alcohol in the wastewater is reduced from 300mg/L to 28mg/L, and the removal rate of the PVA reaches 90.6%.
From examples 1 to 4, it can be seen that the removal rate of polyvinyl alcohol in wastewater can reach 90.6% to 93% when wastewater containing polyvinyl alcohol is treated by the method of examples 1 to 4. Therefore, the method provided by the invention can be used for remarkably reducing the content of polyvinyl alcohol in the wastewater, and has a high removal rate of polyvinyl alcohol.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (10)
1. The method for treating the polyvinyl alcohol in the wastewater is characterized by comprising the following steps of:
adjusting the pH value of the wastewater containing polyvinyl alcohol to 2-4, then adding iron powder and stirring; and then adding an oxidant solution into the wastewater for reaction, wherein the oxidant is persulfate or a composition of the persulfate and hydrogen peroxide and/or potassium permanganate.
2. The method of claim 1, wherein the pH of the wastewater containing polyvinyl alcohol is adjusted to 3-4.
3. The method of claim 1 or 2, wherein the amount of the iron powder is 0.1 to 0.5% by mass of the wastewater.
4. The method according to any one of claims 1 to 3, wherein the oxidant solution is used in an amount such that the mass ratio of the oxidant contained in the solution to the polyvinyl alcohol contained in the wastewater is from 1:1 to 8: 1.
5. The method according to any one of claims 1 to 4, wherein the mass fraction of the oxidizing agent in the oxidizing agent solution is 20% to 40%.
6. The method of any one of claims 1 to 5, wherein the persulfate salt is sodium persulfate, potassium persulfate, or ammonium persulfate.
7. The method according to any one of claims 1 to 6, wherein the persulfate is present in the composition in an amount of 90% wt or more.
8. The process according to any one of claims 1 to 7, wherein the reaction temperature is 10 to 50 ℃ and the reaction time is 30 to 60 min.
9. The method as claimed in any one of claims 1 to 8, wherein the stirring time is 15 to 30min and the rotation speed is 200-600 r/min.
10. The method according to any one of claims 1 to 9, comprising the steps of:
adjusting the pH value of the wastewater containing polyvinyl alcohol to 3-4, then adding iron powder with the mass of 0.1-0.5% of the wastewater, and stirring for 15-30min at the rotation speed of 200-600 r/min; then adding an oxidant solution with the mass fraction of 20-40% into the wastewater to react for 30-60min at the temperature of 10-50 ℃, wherein the oxidant is persulfate or a composition of persulfate and hydrogen peroxide and/or potassium permanganate; the dosage of the oxidant solution is that the mass ratio of the oxidant contained in the solution to the polyvinyl alcohol contained in the wastewater is 1:1-8: 1; the persulfate is sodium persulfate, potassium persulfate or ammonium persulfate; the content of the persulfate in the composition is more than or equal to 90 wt%.
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| 高福成, 中国轻工业出版社 * |
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