CN114920348A - Drinking water treatment method - Google Patents
Drinking water treatment method Download PDFInfo
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- CN114920348A CN114920348A CN202210695900.7A CN202210695900A CN114920348A CN 114920348 A CN114920348 A CN 114920348A CN 202210695900 A CN202210695900 A CN 202210695900A CN 114920348 A CN114920348 A CN 114920348A
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- 238000000034 method Methods 0.000 title claims abstract description 38
- 239000003651 drinking water Substances 0.000 title claims abstract description 27
- 235000020188 drinking water Nutrition 0.000 title claims abstract description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 67
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 claims abstract description 29
- 238000006243 chemical reaction Methods 0.000 claims abstract description 20
- GBAOBIBJACZTNA-UHFFFAOYSA-L calcium sulfite Chemical compound [Ca+2].[O-]S([O-])=O GBAOBIBJACZTNA-UHFFFAOYSA-L 0.000 claims abstract description 18
- 235000010261 calcium sulphite Nutrition 0.000 claims abstract description 18
- 238000002156 mixing Methods 0.000 claims abstract description 18
- NUJOXMJBOLGQSY-UHFFFAOYSA-N manganese dioxide Chemical compound O=[Mn]=O NUJOXMJBOLGQSY-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000007787 solid Substances 0.000 claims abstract description 13
- 238000005345 coagulation Methods 0.000 claims abstract description 7
- 230000015271 coagulation Effects 0.000 claims abstract description 7
- 238000001914 filtration Methods 0.000 claims abstract description 3
- 239000007788 liquid Substances 0.000 claims abstract description 3
- 238000001556 precipitation Methods 0.000 claims abstract description 3
- 238000000926 separation method Methods 0.000 claims abstract description 3
- 239000012286 potassium permanganate Substances 0.000 claims description 23
- 239000007800 oxidant agent Substances 0.000 claims description 14
- 238000003756 stirring Methods 0.000 claims description 12
- 239000002245 particle Substances 0.000 claims description 8
- JYLNVJYYQQXNEK-UHFFFAOYSA-N 3-amino-2-(4-chlorophenyl)-1-propanesulfonic acid Chemical group OS(=O)(=O)CC(CN)C1=CC=C(Cl)C=C1 JYLNVJYYQQXNEK-UHFFFAOYSA-N 0.000 claims description 6
- JESHZQPNPCJVNG-UHFFFAOYSA-L magnesium;sulfite Chemical compound [Mg+2].[O-]S([O-])=O JESHZQPNPCJVNG-UHFFFAOYSA-L 0.000 claims description 6
- 239000000084 colloidal system Substances 0.000 claims description 5
- 239000000843 powder Substances 0.000 claims description 3
- LSNNMFCWUKXFEE-UHFFFAOYSA-L sulfite Chemical compound [O-]S([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-L 0.000 claims description 3
- 239000004295 calcium sulphite Substances 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 13
- 239000011572 manganese Substances 0.000 abstract description 10
- 229910001437 manganese ion Inorganic materials 0.000 abstract description 9
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 abstract description 2
- 229910052748 manganese Inorganic materials 0.000 abstract description 2
- 239000002253 acid Substances 0.000 abstract 1
- 238000006555 catalytic reaction Methods 0.000 abstract 1
- 239000002384 drinking water standard Substances 0.000 abstract 1
- 239000011734 sodium Substances 0.000 description 18
- MYSWGUAQZAJSOK-UHFFFAOYSA-N ciprofloxacin Chemical compound C12=CC(N3CCNCC3)=C(F)C=C2C(=O)C(C(=O)O)=CN1C1CC1 MYSWGUAQZAJSOK-UHFFFAOYSA-N 0.000 description 8
- 239000003344 environmental pollutant Substances 0.000 description 8
- HEFNNWSXXWATRW-UHFFFAOYSA-N Ibuprofen Chemical compound CC(C)CC1=CC=C(C(C)C(O)=O)C=C1 HEFNNWSXXWATRW-UHFFFAOYSA-N 0.000 description 7
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 7
- 150000001875 compounds Chemical class 0.000 description 7
- 229960001680 ibuprofen Drugs 0.000 description 7
- 230000003647 oxidation Effects 0.000 description 7
- 238000007254 oxidation reaction Methods 0.000 description 7
- 231100000719 pollutant Toxicity 0.000 description 7
- 239000000126 substance Substances 0.000 description 7
- 229960005404 sulfamethoxazole Drugs 0.000 description 7
- JLKIGFTWXXRPMT-UHFFFAOYSA-N sulphamethoxazole Chemical compound O1C(C)=CC(NS(=O)(=O)C=2C=CC(N)=CC=2)=N1 JLKIGFTWXXRPMT-UHFFFAOYSA-N 0.000 description 7
- 230000001590 oxidative effect Effects 0.000 description 6
- 239000002957 persistent organic pollutant Substances 0.000 description 5
- 238000004062 sedimentation Methods 0.000 description 5
- 229960003405 ciprofloxacin Drugs 0.000 description 4
- 230000001112 coagulating effect Effects 0.000 description 4
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 description 4
- MXWJVTOOROXGIU-UHFFFAOYSA-N atrazine Chemical compound CCNC1=NC(Cl)=NC(NC(C)C)=N1 MXWJVTOOROXGIU-UHFFFAOYSA-N 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 2
- OSVXSBDYLRYLIG-UHFFFAOYSA-N dioxidochlorine(.) Chemical compound O=Cl=O OSVXSBDYLRYLIG-UHFFFAOYSA-N 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 150000002894 organic compounds Chemical class 0.000 description 2
- 235000010265 sodium sulphite Nutrition 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- 239000004155 Chlorine dioxide Substances 0.000 description 1
- 241001086438 Euclichthys polynemus Species 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 229910001424 calcium ion Inorganic materials 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 235000019398 chlorine dioxide Nutrition 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- -1 manganic acid ions Chemical class 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- UMPKMCDVBZFQOK-UHFFFAOYSA-N potassium;iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[K+].[Fe+3] UMPKMCDVBZFQOK-UHFFFAOYSA-N 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 238000004659 sterilization and disinfection Methods 0.000 description 1
- 230000002110 toxicologic effect Effects 0.000 description 1
- 231100000027 toxicology Toxicity 0.000 description 1
- SWGJCIMEBVHMTA-UHFFFAOYSA-K trisodium;6-oxido-4-sulfo-5-[(4-sulfonatonaphthalen-1-yl)diazenyl]naphthalene-2-sulfonate Chemical compound [Na+].[Na+].[Na+].C1=CC=C2C(N=NC3=C4C(=CC(=CC4=CC=C3O)S([O-])(=O)=O)S([O-])(=O)=O)=CC=C(S([O-])(=O)=O)C2=C1 SWGJCIMEBVHMTA-UHFFFAOYSA-K 0.000 description 1
Images
Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/152—Water filtration
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Removal Of Specific Substances (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
Abstract
The invention discloses a drinking water treatment method which comprises the steps of adding 1-2 mg/L of permanganate into water to be treated, fully mixing the permanganate with the water, adding solid sulfite after the mixing is finished to enable the mass ratio of the solid sulfite to the permanganate to be 1.5-7.5: 1, fully mixing the solid sulfite and the permanganate again, reacting for 5-20 minutes, after calcium sulfite is dissolved and reacted, feeding a water sample into subsequent precipitation and filtration equipment, and carrying out solid-liquid separation under the coagulation assistance of manganese dioxide. The invention controls the reaction rate of permanganate under the catalysis of solid sulfite, so that higher utilization efficiency is achieved under the condition of reaction rate as high as possible, the treatment effect of organic matters in water is improved, manganese acid radicals and divalent manganese ions brought by using the permanganate are thoroughly removed, and secondary pollution to water is avoided, so that the treatment effect of drinking water standard is achieved.
Description
Technical Field
The invention relates to the technical field of water treatment, in particular to a drinking water treatment method.
Background
Along with the development of society and the improvement of living standard of people, the types and the quantity of environmental pollutants are greatly increased, and the detection rate and the detection types of trace organic pollutants in water source water closely related to production and life of people are increased day by virtue of the progress of an environmental detection technology, so that people pay attention to the trace organic pollution in water. Solving the problem of water quality safety has become a long-term project which all mankind needs to face together. The sanitary standard for drinking water of a new edition (GB5749-2006) is issued and implemented in 2007, 7 and 1. The quantity of water quality indexes in the new standard is increased from 35 items of the original standard to 106 items, wherein organic compounds in the toxicological indexes are increased from 5 items to 53 items and account for 67 percent of the newly added indexes. More and more attention is paid to the pollution and control of organic matters. However, the conventional drinking water treatment process (coagulation-precipitation-filtration-disinfection) has low removal rate of most trace organic pollutants, and often cannot meet the current water treatment requirement. Therefore, developing an economical and effective drinking water treatment technology to reduce the concentration of organic pollutants in drinking water and reduce the threat to human health is one of the important development directions of water treatment at present.
In recent years, various new water treatment processes have been developed and applied to water treatment based on biological, physical and chemical methods to improve the quality of municipal water supply. Wherein, the chemical oxidation technology means that pollutants in water are decomposed or converted through the oxidation capacity of a chemical oxidant or an active intermediate substance, thereby achieving the purpose of purifying the water quality. Chemical oxidants currently available for water treatment include chlorine, chlorine dioxide, ozone, hydrogen peroxide, potassium ferrate, potassium permanganate, and the like. The chemical pre-oxidation is added in the conventional water treatment process, so that the burden of subsequent conventional treatment can be reduced, and the removal efficiency of the conventional process on pollutants in the raw water is effectively improved.
CN104609597B discloses a method for ultra-fast removing organic pollutants in water, which comprises the following implementation steps: firstly, adding dissolved sulfite into water to be treated, adjusting the pH of the water to be treated to 3.0-7.0, and then adding permanganate into the water to be treated. The method utilizes high-activity trivalent manganese as an oxidant generated in the reaction process of sulfite and permanganate to realize the ultra-fast removal of organic pollutants in water. The method can oxidize pollutants which cannot be oxidized by permanganate alone, the reaction is completed within seconds, the speed is extremely high, and the application range of the permanganate oxidation method is remarkably expanded.
However, since the reaction of potassium permanganate and dissolved sulfite is completed within several hundred milliseconds, a high-efficiency mixer which can sufficiently mix the chemical with water to be treated in a very short time is required, otherwise the active oxidizing agent generated by the method cannot be mixed with the target pollutant in water in time, but is consumed by means of self-quenching or the like, and the water treatment effect is remarkably reduced.
Disclosure of Invention
The present invention is directed to solving the above-mentioned problems of the prior art and providing a method for treating drinking water, which can improve the efficiency of removing contaminants by using an active oxidant and completely remove residual manganese dioxide and a small amount of divalent manganese ions.
In order to achieve the purpose, the invention provides a drinking water treatment method which comprises the steps of adding a certain amount of permanganate into water to be treated, mixing, adding slow-release solid sulfite after mixing is finished, fully mixing, reacting for 5-20 minutes, wherein the slow-release solid sulfite is used for slowing down the generation of active oxidants in a system and reducing the amount of the active oxidants consumed by excessive sulfite in the water, the residual manganese dioxide colloid plays a coagulation assisting role in the subsequent coagulation process, after the sulfite is dissolved and reacts, a water sample enters subsequent precipitation and filtration equipment for solid-liquid separation, the mass ratio of the solid sulfite to the permanganate is 1.5-7.5: 1, when the mass ratio is 1.5, an excellent effect starts to appear, when the mass ratio is 7.5, the optimal effect is achieved, and no obvious gain exists when the mass ratio is improved.
Preferably, the permanganate is mixed with the water to be treated for a period of 1 minute.
Preferably, the permanganate is sodium permanganate or potassium permanganate.
Preferably, the mixing is carried out in a stirring and evenly mixing manner.
Preferably, the mixing is carried out at a speed of 80 rpm.
Preferably, the solid sulfite is particles or powder with the diameter of 1-5 mm.
Preferably, in order to achieve the effect of slowly releasing sulfite, the sulfite is calcium sulfite or magnesium sulfite.
Compared with the prior art, the invention has the following beneficial technical effects:
the invention provides a drinking water treatment method, wherein dissolved sulfite is replaced by slow-release sulfite, namely calcium sulfite (formula (1)) or magnesium sulfite, and the dissolved sulfite is added in a solid form. The replacement can slow down the generation of active oxidant in the system, so that the active oxidant can be mixed and reacted with target pollutants while being generated; on the other hand, the slow-release sulfite can reduce the amount of the active oxidant consumed by the excessive sulfite in the water, so that more active oxidants can react with the target pollutants, and the utilization rate of the active oxidants is improved; in addition, the manganese dioxide colloid remained in the implementation process of the technology can play a certain coagulation assisting role in the subsequent coagulation process. Because the manganese dioxide colloid is negatively charged, calcium ions introduced when calcium sulfite is added are positively charged, the manganese dioxide colloid can be assisted to aggregate and precipitate, so that residual manganese dioxide and a small amount of bivalent manganese ions are completely removed in a subsequent coagulating sedimentation process, and the secondary pollution of manganic acid ions and bivalent manganese ions caused by using permanganate is avoided, thereby achieving the standard of drinking water treatment.
Note: ksp is the solubility product constant.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described 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 without inventive exercise.
FIG. 1 shows the effect of example 1 on the removal of phenol from water when water from a practical source is treated;
FIG. 2 shows the effect of example 2 on ibuprofen removal from water when treated with a source of water;
FIG. 3 shows the effect of example 3 on the removal of sulfamethoxazole from water when water from an actual source is treated;
FIG. 4 shows the concentration of dissolved organic Compounds (COD) remaining after coagulating sedimentation in water in the case of treating water of an actual source in example 4 Mn )；
FIG. 5 shows the concentration of manganese ions remaining after coagulating sedimentation in water when treating water of an actual source in example 4;
FIG. 6 shows the effect of different forms of sulfite on the removal of atrazine from water in practical source water in example 5;
figure 7 is the kinetics of ciprofloxacin removal in water with calcium sulfite of different particle sizes for the treatment of a formulation of example 6.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
Example 1:
as shown in FIG. 1, this example provides a drinking water treatment method, which comprises adding 10. mu. mol L -1 Adding 1.0mg/L potassium permanganate into water of phenol source, stirring and mixing with water to be treated for 1 minute, and adding Na 2 SO 3 Or CaSO 3 So that Na 2 SO 3 Or CaSO 3 The concentration is 0, 1.5, 3.0, 4.5, 6 and 7.5mg/L respectively, the reaction lasts for 10 minutes, and the reaction process is carried outThe stirring speed of 80 rpm is always maintained. When 1.0mg/L potassium permanganate is added separately, the removal rate of phenol is about 50%, and effluent has chromaticity. When using potassium permanganate and Na 2 SO 3 In combination with Na 2 SO 3 The dosage of the phenol removal agent is gradually increased, the removal rate of phenol is slightly increased, and the removal rate under the optimal working condition is only about 55 percent. When potassium permanganate and CaSO 3 In combination, the removal rate of phenol increases with increasing concentration of calcium sulfite. When the dosage of the potassium permanganate is 1.0mg/L, CaSO 3 The dosage is 7.5mg/L, and the removal rate of phenol is about 99%.
Example 2:
as shown in FIG. 2, this example provides a drinking water treatment method, which comprises adding 10. mu. mol L -1 Adding 2.0mg/L sodium permanganate into water source of ibuprofen, stirring and mixing with water to be treated for 1 minute, and adding Na 2 SO 3 Or CaSO in the form of particles having a particle size of 1mm 3 So that Na is present 2 SO 3 Or CaSO 3 The concentrations of (A) and (B) are respectively 0, 1.5, 3.0, 5.0, 10.0 and 15.0mg/L, the reaction is carried out for 15 minutes, and the stirring speed of 80 revolutions per minute is always kept in the reaction process. When 2.0mg/L of sodium permanganate is used alone for oxidation removal, the removal rate is only about 5.0%, and the problem of color is existed. When sodium permanganate and Na are used 2 SO 3 In combination with Na 2 SO 3 The adding amount of the ibuprofen is gradually increased, the removal rate of the ibuprofen is slightly increased, and the removal rate under the best working condition is only about 45%. When sodium permanganate and CaSO are used 3 When combined with CaSO 3 The dosage of ibuprofen is gradually increased, and the removal rate of ibuprofen is gradually increased. When CaSO 3 When the dosage is 15.0mg/L, the removal rate of ibuprofen is more than 96%, and no chromaticity problem exists in the subsequent process.
Example 3:
as shown in FIG. 3, this example provides a drinking water treatment method, which comprises adding 10. mu. mol L -1 Adding 2.0mg/L potassium permanganate into water source of sulfamethoxazole, stirring and mixing with water to be treated for 1 minute, and adding Na 2 SO 3 Or CaSO 3 So that Na is present 2 SO 3 Or CaSO 3 The concentrations of (A) were 0, 1.5, 3.0, 5.0, 10.0, and 15.0mg/L, respectively, and the reaction was carried out for 10 minutes while keeping the stirring speed at 80 rpm. When the potassium permanganate with the concentration of 2.0mg/L is used for oxidation removal, the removal rate of sulfamethoxazole is only about 35%, and the effluent has chromaticity. When using potassium permanganate and Na 2 SO 3 In combination with Na 2 SO 3 The dosage of the sulfamethoxazole is gradually increased, the removal rate of the sulfamethoxazole is slightly increased, and the removal rate under the optimal working condition is only about 50 percent. Potassium permanganate and CaSO 3 When combined, the removal rate of sulfamethoxazole is changed along with CaSO 3 Increases with increasing concentration of (c). When the dosage of the potassium permanganate is 2.0mg/L, CaSO 3 The dosage is 15.0mg/L, and the removal rate of sulfamethoxazole is about 99%.
Example 4:
referring to fig. 4, the drinking water treatment method provided in this embodiment is to provide water (COD) as an actual water source Mn 2.5mg/L), and after stirring and mixing with water to be treated for 1 minute, Na was added 2 SO 3 Or CaSO 3 So that Na is present 2 SO 3 Or CaSO 3 The concentration of the water is 0, 1.5, 3.0, 5.0, 10.0 and 15.0mg/L respectively, the reaction is carried out for 10 minutes, the stirring speed of 80 revolutions per minute is kept in the reaction process, and then the residual COD is measured after coagulating sedimentation Mn . When 2.0mg/L potassium permanganate is used alone for oxidation removal, the potassium permanganate can treat COD Mn Almost not removed. When using potassium permanganate and Na 2 SO 3 In combination with Na 2 SO 3 Gradually increases the dosage of (A), COD Mn The residual amount decreases a little and increases, i.e. COD Mn The removal of (a) increases first and then decreases. As shown in FIG. 5, Na was used 2 SO 3 Then, the concentration of manganese ions in the effluent is 0.1-1.0 mg/L, which is higher than the sanitary standard of drinking water, and CaSO is used 3 When the amount of manganese ions added is 15.0mg/L, substantially no manganese ions remain. And with CaSO 3 Increase of input amount, COD Mn The residue gradually decreases when CaSO 3 The dosage is 15.0mg/L, COD Mn The residual concentration of (2) was reduced to 1.7 mg/L. After using calcium sulfiteThe color of the factory water and manganese ions are far lower than the sanitary standard of drinking water. Using Na 2 SO 3 Or CaSO 3 The purple red of permanganate is not seen in the flocculation tank and the sedimentation tank.
Example 5
As shown in FIG. 6, this example provides a drinking water treatment method, which comprises adding 10. mu. mol L -1 2.0mg/L of potassium permanganate is added into atrazine source water, after the potassium permanganate and the water to be treated are stirred and mixed for 1 minute, 15mg/L of sulfites with different forms are added for reaction for 20 minutes, and the forms of the sulfites comprise sodium sulfite solution, magnesium sulfite, powdery calcium sulfite, granular calcium sulfite with the grain diameter of 1mm, granular calcium sulfite with the grain diameter of 3mm and granular calcium sulfite with the grain diameter of 5mm which are prepared in advance. The stirring speed of 80 rpm was maintained during the reaction. When 2.0mg/L potassium permanganate is used alone, the removal rate is only about 3.0 percent, and the problem of chromaticity exists. When the potassium permanganate and the sulfite are combined, the effect of removing pollutants by using the magnesium sulfite or the calcium sulfite is better than that of sodium sulfite, the removal rate of atrazine is higher than 85% by adding the calcium sulfite or the magnesium sulfite with different grain diameters, and no chromaticity problem exists in the follow-up process.
Example 6
As shown in FIG. 7, this example provides a drinking water treatment method, which comprises adding 10. mu. mol L -1 2.0mg/L potassium permanganate is added into water source water of the ciprofloxacin, and after the potassium permanganate and the water to be treated are stirred and mixed for 1 minute, 10mg/L calcium sulfite with different grain diameters is added for reaction for 20 minutes. The stirring speed of 80 rpm was maintained during the reaction. When calcium sulfite in powder form is used, the reaction equilibrates around 5 minutes due to its faster rate of sulfite release. The reaction reached equilibrium for a longer time with larger particle size of calcium sulfite, and when calcium sulfite particles of 5mm size were used, the reaction reached equilibrium in 17.5 minutes with a ciprofloxacin removal of 92%. The removal rate of the ciprofloxacin can be basically the same by using calcium sulfite with different particle sizes.
The principle and the implementation mode of the invention are explained by applying a specific embodiment, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, this summary should not be construed as limiting the invention.
Claims (7)
1. A drinking water treatment method is characterized in that a certain amount of permanganate is added into water to be treated for mixing, after mixing is finished, slow-release solid sulfite is added and fully mixed, reaction is carried out for 5-20 minutes, the slow-release solid sulfite is used for slowing down generation of active oxidants in a system and reducing consumption of excessive sulfite in water to the active oxidants, residual manganese dioxide colloid plays a coagulation assisting role in a subsequent coagulation process, after the sulfite is dissolved and reacted, a water sample enters subsequent precipitation filtering equipment for solid-liquid separation, and the mass ratio of the solid sulfite to the permanganate is 1.5-7.5: 1.
2. A drinking water treatment process according to claim 1, characterized in that the permanganate is mixed with the water to be treated for a period of 1 minute.
3. The drinking water treatment method according to claim 1, wherein the permanganate is sodium permanganate or potassium permanganate.
4. The drinking water treatment method according to claim 1, wherein the mixing is performed by stirring and mixing.
5. A drinking water treatment method according to claim 4, characterized in that the mixing speed is 80 rpm.
6. A drinking water treatment method as claimed in claim 1, wherein the solid sulfite is in the form of particles or powder with a diameter of 1-5 mm.
7. A drinking water treatment method according to claim 6, characterized in that the sulphite is calcium sulphite or magnesium sulphite.
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| JP2005046763A (en) * | 2003-07-30 | 2005-02-24 | Nippon Chem Ind Co Ltd | Method of treating environmental contaminant |
| CN106830436A (en) * | 2017-03-13 | 2017-06-13 | 同济大学 | A kind of method for pre-oxidizing for drinking water treatment |
| CN108163957A (en) * | 2017-12-28 | 2018-06-15 | 深圳职业技术学院 | A kind of method for treating water using manganese sand catalyzed sulfite oxidative degradation organic pollution |
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