CN111115749A - Method for treating pesticide pollution of molinate in water - Google Patents
Method for treating pesticide pollution of molinate in water Download PDFInfo
- Publication number
- CN111115749A CN111115749A CN201911378912.1A CN201911378912A CN111115749A CN 111115749 A CN111115749 A CN 111115749A CN 201911378912 A CN201911378912 A CN 201911378912A CN 111115749 A CN111115749 A CN 111115749A
- Authority
- CN
- China
- Prior art keywords
- water
- molinate
- medium
- ultraviolet rays
- treating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- DEDOPGXGGQYYMW-UHFFFAOYSA-N molinate Chemical compound CCSC(=O)N1CCCCCC1 DEDOPGXGGQYYMW-UHFFFAOYSA-N 0.000 title claims abstract description 87
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 80
- 239000000575 pesticide Substances 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title claims abstract description 28
- 230000000694 effects Effects 0.000 claims abstract description 31
- 238000006243 chemical reaction Methods 0.000 claims abstract description 13
- AKHNMLFCWUSKQB-UHFFFAOYSA-L sodium thiosulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=S AKHNMLFCWUSKQB-UHFFFAOYSA-L 0.000 claims abstract description 13
- 235000019345 sodium thiosulphate Nutrition 0.000 claims abstract description 13
- 230000001678 irradiating effect Effects 0.000 claims abstract description 12
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims abstract description 11
- QJZYHAIUNVAGQP-UHFFFAOYSA-N 3-nitrobicyclo[2.2.1]hept-5-ene-2,3-dicarboxylic acid Chemical compound C1C2C=CC1C(C(=O)O)C2(C(O)=O)[N+]([O-])=O QJZYHAIUNVAGQP-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000004021 humic acid Substances 0.000 claims abstract description 9
- 238000001514 detection method Methods 0.000 claims abstract description 7
- 239000000126 substance Substances 0.000 claims abstract description 7
- 238000004364 calculation method Methods 0.000 claims abstract description 3
- 230000015556 catabolic process Effects 0.000 claims description 51
- 238000006731 degradation reaction Methods 0.000 claims description 51
- 239000000460 chlorine Substances 0.000 claims description 39
- 229910052801 chlorine Inorganic materials 0.000 claims description 38
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims description 37
- 238000005286 illumination Methods 0.000 claims description 12
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 claims description 4
- 229910052753 mercury Inorganic materials 0.000 claims description 4
- 150000001449 anionic compounds Chemical class 0.000 claims description 3
- 229910001412 inorganic anion Inorganic materials 0.000 claims description 3
- 230000005855 radiation Effects 0.000 claims description 3
- 238000004458 analytical method Methods 0.000 claims description 2
- 238000011109 contamination Methods 0.000 claims 7
- 230000008569 process Effects 0.000 abstract description 5
- 150000001450 anions Chemical class 0.000 abstract description 4
- 238000000354 decomposition reaction Methods 0.000 abstract 1
- 239000000243 solution Substances 0.000 description 32
- 239000011521 glass Substances 0.000 description 10
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 9
- 239000002352 surface water Substances 0.000 description 7
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 description 6
- 239000003651 drinking water Substances 0.000 description 4
- 235000020188 drinking water Nutrition 0.000 description 4
- 238000004659 sterilization and disinfection Methods 0.000 description 4
- 239000000356 contaminant Substances 0.000 description 3
- 239000003344 environmental pollutant Substances 0.000 description 3
- 239000008239 natural water Substances 0.000 description 3
- 231100000719 pollutant Toxicity 0.000 description 3
- 229910000030 sodium bicarbonate Inorganic materials 0.000 description 3
- 235000017557 sodium bicarbonate Nutrition 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 2
- 238000009303 advanced oxidation process reaction Methods 0.000 description 2
- 239000002384 drinking water standard Substances 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- -1 sulfate radical Chemical class 0.000 description 2
- 230000001988 toxicity Effects 0.000 description 2
- 231100000419 toxicity Toxicity 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- KZBUYRJDOAKODT-UHFFFAOYSA-N Chlorine Chemical compound ClCl KZBUYRJDOAKODT-UHFFFAOYSA-N 0.000 description 1
- 241000234653 Cyperus Species 0.000 description 1
- 241000192043 Echinochloa Species 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- 241000221079 Euphorbia <genus> Species 0.000 description 1
- 229910002651 NO3 Inorganic materials 0.000 description 1
- 206010028980 Neoplasm Diseases 0.000 description 1
- 208000012902 Nervous system disease Diseases 0.000 description 1
- 208000025966 Neurological disease Diseases 0.000 description 1
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 description 1
- 229910052921 ammonium sulfate Inorganic materials 0.000 description 1
- 235000011130 ammonium sulphate Nutrition 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 208000035475 disorder Diseases 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 235000012055 fruits and vegetables Nutrition 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- YPJKMVATUPSWOH-UHFFFAOYSA-N nitrooxidanyl Chemical compound [O][N+]([O-])=O YPJKMVATUPSWOH-UHFFFAOYSA-N 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000001850 reproductive effect Effects 0.000 description 1
- 208000023504 respiratory system disease Diseases 0.000 description 1
- 208000017520 skin disease Diseases 0.000 description 1
- 229910052938 sodium sulfate Inorganic materials 0.000 description 1
- 235000011152 sodium sulphate Nutrition 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Images
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
- C02F1/30—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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/76—Treatment of water, waste water, or sewage by oxidation with halogens or compounds of halogens
-
- 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
- C02F2101/306—Pesticides
Abstract
The invention discloses a method for treating pesticide pollution of molinate in water, which comprises the following treatment processes: irradiating water polluted by molinate pesticide with medium-pressure ultraviolet ray of polychromatic light with wavelength of 200-600 nm at dosage of 0.75-150 mJ/cm2Detecting and analyzing the water to be treated to determine the required irradiation dose of the medium-pressure ultraviolet rays, detecting the irradiation intensity of the medium-pressure ultraviolet rays through a detection device, calculating the irradiation time corresponding to the set irradiation dose of the medium-pressure ultraviolet rays according to a calculation table formulated by the International ultraviolet society, and adding a sodium thiosulfate solution to terminate the reaction after the irradiation time is finished. The invention can comprehensively consider the influence of anions, humic acid, pH value, ammonia nitrogen and other substances in water on the decomposition process of the molinate and flexibly adjustThe irradiation dose of medium-pressure ultraviolet rays can ensure that the water treatment effect is optimal.
Description
Technical Field
The invention relates to the field of treatment of pesticide pollutants in surface water and underground water, in particular to a method for treating pesticide pollution of molinate in water.
Background
In recent years, the pesticide pollution incidents occur successively in groundwater and surface water in a plurality of countries and regions, and most pesticides have certain toxicity and may cause respiratory diseases, neurological disorders, cancers, reproductive disorders, skin diseases and the like. Brings great harm to human health and ecological environment, so that the pesticide becomes one of the pollutants which are currently focused on by various water bodies. More than 20 pesticide indexes are added in the sanitary standard of domestic drinking water newly implemented in 7, 1 and 7 months in 2007 in China. The united states not only places certain pesticides in a limiting index in drinking water standards, but also establishes a candidate list of drinking water contaminants (CCL) that list contaminants that are not in drinking water standards but have been found or are likely to occur in water supplies, with the 28 pesticide contaminants included in the CCL4 list in 2015.
Molinate is widely applied to paddy fields for preventing and removing barnyard grass, hairy euphorbia, cyperus heterophylla and the like, and the water layer is usually kept for 7 days during and after application of the pesticide due to strong volatility, so that underground water and surrounding surface water are easily polluted, and the existence of the molinate in a plurality of surface water is detected in many documents at present. Molinate has certain toxicity, has low content in source water and stable chemical property, and is difficult to effectively remove by conventional water treatment processes, such as coagulation, precipitation, filtration, disinfection and the like. Therefore, it is important to find a method for effectively removing molinate pesticides from water to ensure the safety of drinking water.
Disclosure of Invention
The invention aims to provide a method for treating the pesticide pollution of molinate in water aiming at the problems that the molinate in underground water and surface water is difficult to treat and the like in the background technology.
In order to achieve the purpose, the invention is realized by the following technical scheme: a method for treating the pesticide pollution of molinate in water has the structural characteristics that: which comprises the following steps: the method comprises the following processing procedures: irradiating water polluted by molinate pesticide with medium-pressure ultraviolet ray of more than 200-600 nm wavelengthThe irradiation dose of the colored light and the medium-pressure ultraviolet light is 0.75 to 150mJ/cm2Detecting and analyzing the water to be treated to determine the required irradiation dose of the medium-pressure ultraviolet rays, detecting the irradiation intensity of the medium-pressure ultraviolet rays through a detection device, calculating the irradiation time corresponding to the set irradiation dose of the medium-pressure ultraviolet rays according to a calculation table formulated by the International ultraviolet society, and adding a sodium thiosulfate solution to terminate the reaction after the irradiation time is finished.
The further proposal is that chlorine is introduced into the water while the medium-ultraviolet radiation is adopted, the dosage of the chlorine is 2-10 mg added into each liter of water, and the required amount of the introduced chlorine is determined according to the detection and analysis result of the water.
The further proposal is that the medium-pressure ultraviolet rays are obtained by emitting medium-pressure mercury lamps, the rated power of the medium-pressure mercury lamps is 3.5 kW, and the power can be adjusted.
Further, the detection device for detecting the illumination intensity of the medium-pressure ultraviolet rays is an ILT1700 ultraviolet irradiator.
In a further scheme, when humic acid exists in water, the humic acid has an auxiliary degradation effect on the degradation of molinate in the water, and the required irradiation dose of the intermediate-sub ultraviolet rays is reduced.
In a further scheme, when different inorganic anions exist in water, the water has an auxiliary degradation effect on the degradation of molinate in the water, and the required irradiation dose of the intermediate-sub ultraviolet rays is reduced.
The further proposal is that when ammonia nitrogen substances exist in water, the higher the content of the ammonia nitrogen substances in the water is, the larger the required irradiation dose of the intermediate-sub ultraviolet rays is.
Further, the higher the pH of the water, the higher the dose of the mid-UV radiation required.
The invention has the positive effects that: the method for treating the pesticide pollution of the molinate in the water has the beneficial effects that: 1) the treatment efficiency of the invention is far higher than that of the molinate pesticide in the prior art; 2) the chlorine used in the treatment of the molinate is low in cost and convenient to use, and the treatment efficiency of the molinate pesticide can be greatly improved; 3) because the treated water contains humic acid, chloride ions, sulfate radicals and substances with promotion effect on degradation effect of nitrate radicals, the best treatment effect can be generated at the lowest cost by adopting the treatment method of the invention; 4) the treatment method can flexibly adjust the irradiation dose of medium-pressure ultraviolet rays and the introduction amount of chlorine according to the water quality of water to be treated so as to meet the water use requirements of different regions, has broad-spectrum adaptability, can ensure that the water treatment effect is the best, avoids secondary pollution caused by excessive dosage of treatment agents, needs subsequent continuous treatment, saves the cost and improves the efficiency.
Drawings
FIG. 1 is a graph comparing the effect of the protocols of examples 1-3 of the present invention in degrading molinate.
FIG. 2 is a graph showing the effect of molinate degradation in the presence of various inorganic anions in water in example 4 of the present invention.
FIG. 3 is a graph showing the degradation effects of molinate under different alkalinity conditions in example 5 of the present invention.
FIG. 4 is a graph showing the effect of molinate degradation in the presence of varying concentrations of humic acid in water in example 6 of the present invention.
FIG. 5 is a graph showing the degradation of molinate at various chlorine dosages as in example 7 of the present invention.
FIG. 6 is a graph of the effect of the treatment of example 8 of the present invention on the presence of various concentrations of molinate in water.
FIG. 7 is a graph showing the degradation effects of molinate under different alkalinity conditions in example 9 of the present invention.
FIG. 8 shows the degradation effect of molinate under different ammonia nitrogen conditions in example 10 of the present invention.
Detailed Description
The technical solutions of the present invention are described clearly and completely by the following embodiments, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
Adding 20ml of a molinate water solution with the concentration of 5 mu mol/L into a glass culture dish, wherein the pH value of the solution is 7, irradiating under medium-pressure ultraviolet rays, measuring the illumination intensity by using an ILT1700 ultraviolet irradiator, and calculating the corresponding irradiation time according to the set irradiation dose. Immediately after the expected irradiation time is reached, a sodium thiosulfate solution is added to terminate the reaction, and then a sample is taken to determine the molinate degradation rate. Degradation rate is plotted against irradiation dose, as shown by the curve in figure 1. MPUV in the figure represents the protocol for medium pressure UV light.
Example 2
Adding 20ml of a molinate water solution with the concentration of 5 mu mol/L into a glass culture dish, wherein the pH value of the solution is 7, irradiating under medium-pressure ultraviolet rays, measuring the illumination intensity by using an ILT1700 ultraviolet irradiator, and calculating the corresponding irradiation time according to the set irradiation dose. Simultaneously adding hydrogen peroxide, wherein the amount of the added hydrogen peroxide is 70 mu mol/L, immediately adding a sodium thiosulfate solution to terminate the reaction after the expected irradiation time is reached, and then sampling to determine the molinate degradation rate. Degradation rates are plotted against irradiation dose, as shown in the graph of FIG. 1, where MPUV + H2O2 represents the medium pressure UV plus hydrogen peroxide regime.
Example 3
Adding 20ml of a molinate water solution with the concentration of 5 mu mol/L into a glass culture dish, wherein the pH value of the solution is 7, irradiating under medium-pressure ultraviolet rays, measuring the illumination intensity by using an ILT1700 ultraviolet irradiator, and calculating the corresponding irradiation time according to the set irradiation dose. And simultaneously introducing chlorine into the solution, wherein the introduction amount is 70 mu mol/L, immediately adding a sodium thiosulfate solution to terminate the reaction after the expected irradiation time is reached, and then sampling to determine the molinate degradation rate. Degradation rates are plotted against irradiation dose as shown in the graph of fig. 1, where MPUV + CL2 represents the medium pressure uv plus chlorine regime.
As can be seen from figure 1, in the three schemes of examples 1-3, single medium-pressure ultraviolet has a certain degradation effect on molinate, the degradation effect is improved after hydrogen peroxide is added, but the improvement effect is not obvious, and medium-pressure ultraviolet and chlorine are used for treating the molinateThe degradation effect of the enemy is the best, and is 40 mJ/cm2Under the action of the ultraviolet dose of the chlorine and 70 mu mol/L, the molinate is almost completely degraded.
Example 4
Preparing a molinate water solution containing different anions, wherein the pH value of the solution is 7, the molinate concentration is 5 mu mol/L, adding 20ml of the corresponding solution into a glass culture dish, irradiating under medium-pressure ultraviolet rays, introducing 5mg/L chlorine into the solution, measuring the illumination intensity by using an ILT1700 ultraviolet irradiator, and calculating the corresponding irradiation time according to the set irradiation dose. Immediately after the expected irradiation time is reached, a sodium thiosulfate solution is added to terminate the reaction, and then a sample is taken to determine the molinate degradation rate. Degradation rate is plotted against irradiation dose, as shown by the curve in fig. 2.
As can be seen from figure 2, three anions, namely sulfate radical, nitrate radical and chloride ion, mainly exist in water, have certain promotion effect on the degradation of molinate, the presence of the anions is favorable for the degradation of molinate, the chlorine dosage is 5mg/L, and the ultraviolet dose is 30mJ/cm2Under the conditions of (1) can degrade the molinate almost completely.
Example 5
Carbonate generally exists in natural water, so that the water has certain buffering capacity and provides alkalinity, and sodium bicarbonate is used for providing alkalinity and adjusting the pH value to be 8 in the embodiment, so as to simulate the natural water. Preparation of NaHCO solutions containing different concentrations3The concentration of the molinate is 5 mu M, 20ml of the molinate solution is added into a glass culture dish, then the glass culture dish is irradiated under medium-pressure ultraviolet rays, 5mg/L of chlorine is added simultaneously, the illumination intensity is measured by an ILT1700 ultraviolet irradiator, and the corresponding irradiation time is calculated according to the set irradiation dose. Immediately after the expected irradiation time is reached, a sodium thiosulfate solution is added to terminate the reaction, and then a sample is taken to determine the molinate degradation rate. The degradation rate is plotted against treatment time, as shown by the curve in fig. 3.
As can be seen from FIG. 3, 1 mmol/L sodium bicarbonate has little effect on molinate degradation, 5 mmol/L and 10mmol/L sodium bicarbonate promote molinate degradation, and a general advanced oxidation process generates hydroxyl radicals due to the carbonic acidSalts are typical radical quenchers and affect the treatment when the alkalinity in water is high, which is not the case with the process of the present invention. 5mg/L of chlorine, 60mJ/cm under the condition of pH =8 water quality2The ultraviolet dose of (a) can degrade molinate almost completely.
Example 6
Preparing water solutions of molinate containing humic acid with different concentrations to enable the concentration of the molinate to be 5 mu mol/L, respectively adding 20ml of the solutions into a glass culture dish, then irradiating under medium-pressure ultraviolet rays, simultaneously adding 5mg/L of chlorine, measuring the illumination intensity by using an ILT1700 ultraviolet irradiator, and calculating corresponding irradiation time according to the set irradiation dose. Immediately after the expected irradiation time is reached, a sodium thiosulfate solution is added to terminate the reaction, and then a sample is taken to determine the molinate degradation rate. The degradation rate is plotted against treatment time, as shown by the curve in fig. 4.
As can be seen from FIG. 4, 5mg/L of humic acid did not significantly promote the degradation of molinate, but 10 and 20 mg/L of humic acid significantly promoted the degradation of molinate. The dosage of chlorine is 5mg/L, and the ultraviolet dose is 30mJ/cm2Can degrade the molinate almost completely.
Example 7
Adding 5 mu mol/L molinate solution into a glass culture dish, irradiating under medium-pressure ultraviolet rays, simultaneously adding chlorine with different concentrations, measuring the illumination intensity by using an ILT1700 ultraviolet irradiator, and calculating the corresponding irradiation time according to the set irradiation dose. Immediately after the expected irradiation time is reached, a sodium thiosulfate solution is added to terminate the reaction, and then a sample is taken to determine the molinate degradation rate. The degradation rate is plotted against treatment time, as shown by the curve in fig. 5.
As can be seen from FIG. 5, the chlorine dosage has a large influence on the degradation effect of molinate, the chlorine significantly promotes the degradation of molinate, and the higher the chlorine concentration is, the better the effect is, but considering that the chlorine dosage is too large, disinfection byproducts may be generated in the later period and the excessive chlorine needs to be removed by a reducing agent, the too large dosage is not suitable for practical use. Under the water quality condition, the dosage of chlorine is 5mg/L, and the ultraviolet dose is 30mJ/cm2The molinate can be completely degraded.
Example 8
Adding molinate solutions with different concentrations into a glass culture dish, irradiating under medium-pressure ultraviolet rays, adding 10 mg/L chlorine, measuring the illumination intensity by using an ILT1700 ultraviolet irradiator, and calculating the corresponding irradiation time according to the set irradiation dose. Immediately after the expected irradiation time is reached, a sodium thiosulfate solution is added to terminate the reaction, and then a sample is taken to determine the molinate degradation rate. Degradation rate was plotted against irradiation dose as shown by the curve in fig. 6.
As can be seen from FIG. 6, the lower the molinate concentration in water, the better the degradation effect, but the lower the degradation effect of the high-concentration molinate is not significant, the chlorine concentration is 10 mg/L, and the ultraviolet dose is 20mJ/cm2Under the condition, the molinate within the range of 2-20 mu mol/L has good degradation effect.
Example 9
Preparing molinate solutions with different pH values and 5 mu mol/L concentration, then respectively taking 20ml of the molinate solutions, adding the molinate solutions into a glass culture dish, irradiating under medium-pressure ultraviolet rays, simultaneously adding 5mg/L chlorine, measuring the illumination intensity by using an ILT1700 ultraviolet irradiator, and calculating the corresponding irradiation time according to the set irradiation dose. Immediately after the expected irradiation time is reached, a sodium thiosulfate solution is added to terminate the reaction, and then a sample is taken to determine the molinate degradation rate. Degradation rates were plotted against treatment time as shown by the curve in fig. 7.
As can be seen from FIG. 7, the lower the pH, the better the degradation effect. When the pH is 7 or below, the chlorine dosage is 5mg/L and the ultraviolet dose is 30mJ/cm2The molinate can be almost completely degraded, the ultraviolet dose needs to be increased under the condition of higher pH, and the pH of the common natural water body is between 6.5 and 8.5, so that 60mJ/cm2The ultraviolet dose can basically ensure that the molinate has better treatment effect.
Example 10
Ammonium sulfate is used for providing ammonia nitrogen, sodium sulfate with the same concentration is used as a contrast, the influence of sulfate radicals is eliminated, a molinate aqueous solution containing ammonia nitrogen with different concentrations is prepared (the molinate concentration is 5 mu mol/L), then irradiation is carried out under medium-pressure ultraviolet rays, 5mg/L of chlorine is added at the same time, the illumination intensity is measured by using an ILT1700 ultraviolet irradiator, and the corresponding irradiation time is calculated according to the set irradiation dose. Immediately after the expected irradiation time is reached, a sodium thiosulfate solution is added to terminate the reaction, and then a sample is taken to determine the molinate degradation rate. Degradation rate was plotted against irradiation dose, as shown by the curve in fig. 8.
From figure 8, it is found that the presence of ammonia nitrogen can inhibit the degradation of molinate, but the inhibition effect of 0.5mg/L ammonia nitrogen is limited, 5mg/L chlorine and 60mJ/cm2Under the ultraviolet dose, the molinate can be almost completely degraded. The treatment effect is hardly influenced when treating water of the type IV underground water and the type II surface water and above. If surface water V-type water is treated (wherein the ammonia nitrogen content is 2 mg/L), the chlorine dosage needs to be increased or the ultraviolet dosage needs to be increased to 150mJ/cm2。
Chlorine generates a large amount of hydroxyl radicals (. OH) and chlorine radicals (. Cl) under the irradiation of medium-pressure ultraviolet rays, has stronger oxidizability, and can effectively degrade molinate. At present, most of water plants use chlorine for disinfection, and can be upgraded to a medium-pressure ultraviolet/chlorine advanced oxidation process through simple transformation. The combined process can remove pesticide pollutants in water, has the functions of sterilization and disinfection, is simple to use, and can flexibly adjust the chlorine dosage and the irradiation dose of medium-pressure ultraviolet rays according to water quality conditions. The method can be used for drinking water treatment, household small-sized water treatment equipment, fruit and vegetable processing and cleaning water and the like, and has a good application prospect.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. A method for treating the pesticide pollution of molinate in water is characterized by comprising the following steps: the method comprises the following processing procedures: irradiating pesticide dirt containing molinate by medium-pressure ultraviolet raysDyed water, medium-pressure ultraviolet rays as polychromatic light having a wavelength ranging from 200 to 600 nm, and a dose of the medium-pressure ultraviolet rays being from 0.75 to 150mJ/cm2Detecting and analyzing the water to be treated to determine the required irradiation dose of the medium-pressure ultraviolet rays, detecting the irradiation intensity of the medium-pressure ultraviolet rays through a detection device, calculating the irradiation time corresponding to the set irradiation dose of the medium-pressure ultraviolet rays according to a calculation table formulated by the International ultraviolet society, and adding a sodium thiosulfate solution to terminate the reaction after the irradiation time is finished.
2. The method of treating molinate pesticide contamination in water of claim 1, wherein: introducing chlorine into the water while irradiating by using the medium-ultraviolet ray, wherein the addition amount of the chlorine is 2-10 mg per liter of the water, and determining the amount of the chlorine required to be introduced according to the detection and analysis result of the water.
3. The method of treating molinate pesticide contamination in water of claim 1, wherein: the medium-pressure ultraviolet rays are obtained by emitting medium-pressure mercury lamps, the rated power of the medium-pressure mercury lamps is 3.5 kW, and the power can be adjusted.
4. The method of treating molinate pesticide contamination in water of claim 1, wherein: the detection equipment for detecting the illumination intensity of the medium-pressure ultraviolet rays is an ILT1700 ultraviolet radiometer.
5. The method of treating molinate pesticide contamination in water of claim 1, wherein: when humic acid exists in water, the auxiliary degradation effect is realized on the degradation of molinate in the water, and the required irradiation dose of the intermediate-sub ultraviolet rays is reduced.
6. The method of treating molinate pesticide contamination in water of claim 1, wherein: when different inorganic anions exist in water, the auxiliary degradation effect is realized on the degradation of molinate in the water, and the required irradiation dose of the intermediate-sub ultraviolet rays is reduced.
7. The method of treating molinate pesticide contamination in water of claim 1, wherein: when ammonia nitrogen substances exist in water, the higher the content of the ammonia nitrogen substances in the water is, the larger the required irradiation dose of the intermediate-sub ultraviolet rays is.
8. The method of treating molinate pesticide contamination in water of claim 1, wherein: the higher the pH of the water, the greater the dosage of the mid-to-sub UV radiation required.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911378912.1A CN111115749A (en) | 2019-12-27 | 2019-12-27 | Method for treating pesticide pollution of molinate in water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911378912.1A CN111115749A (en) | 2019-12-27 | 2019-12-27 | Method for treating pesticide pollution of molinate in water |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111115749A true CN111115749A (en) | 2020-05-08 |
Family
ID=70504229
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911378912.1A Pending CN111115749A (en) | 2019-12-27 | 2019-12-27 | Method for treating pesticide pollution of molinate in water |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111115749A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101402484A (en) * | 2008-07-21 | 2009-04-08 | 北京桑德环保集团有限公司 | Free radical deep oxidization reactor |
| CN103523900A (en) * | 2013-10-24 | 2014-01-22 | 中山大学 | Method for removing micro-pollutants in water via combination of ultraviolet light and free chlorine |
| CN104150562A (en) * | 2014-08-23 | 2014-11-19 | 哈尔滨工业大学 | Method for disinfecting filtered water from water plant with cooperation between medium-pressure ultraviolet catalyzing peroxymonosulfate and chloramine |
| CN104860458A (en) * | 2015-06-02 | 2015-08-26 | 哈尔滨工业大学 | Method for removing ammonia and nitrogen in drinking water by adopting chlorination/ultraviolet coupling |
| CN106082390A (en) * | 2016-07-27 | 2016-11-09 | 中山大学 | A kind of method that ultraviolet light and the combination of free chlorine reduce water quality comprehensive toxicity |
-
2019
- 2019-12-27 CN CN201911378912.1A patent/CN111115749A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101402484A (en) * | 2008-07-21 | 2009-04-08 | 北京桑德环保集团有限公司 | Free radical deep oxidization reactor |
| CN103523900A (en) * | 2013-10-24 | 2014-01-22 | 中山大学 | Method for removing micro-pollutants in water via combination of ultraviolet light and free chlorine |
| CN104150562A (en) * | 2014-08-23 | 2014-11-19 | 哈尔滨工业大学 | Method for disinfecting filtered water from water plant with cooperation between medium-pressure ultraviolet catalyzing peroxymonosulfate and chloramine |
| CN104860458A (en) * | 2015-06-02 | 2015-08-26 | 哈尔滨工业大学 | Method for removing ammonia and nitrogen in drinking water by adopting chlorination/ultraviolet coupling |
| CN106082390A (en) * | 2016-07-27 | 2016-11-09 | 中山大学 | A kind of method that ultraviolet light and the combination of free chlorine reduce water quality comprehensive toxicity |
Non-Patent Citations (4)
| Title |
|---|
| PO YEE CHAN ETAL: "A solar-driven UV/Chlorine advanced oxidation process", 《WATER RESEARCH》 * |
| 傅先强等: "《养禽场禽病检验手册》", 30 November 1992, 中国农业大学出版社 * |
| 刘希涛等: "《活化过硫酸盐在环境污染控制中的应用》", 30 April 2018, 北京：中国环境出版集团 * |
| 贾瑞宝等: "《城市供水藻类污染控制研究》", 30 April 2006, 山东大学出版社 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10723644B2 (en) | Method for controlling chlorinated nitrogen-containing disinfection by-product in water | |
| López‐Peñalver et al. | Photodegradation of tetracyclines in aqueous solution by using UV and UV/H2O2 oxidation processes | |
| Polo-López et al. | Solar disinfection of fungal spores in water aided by low concentrations of hydrogen peroxide | |
| Wang et al. | Synergistic effect of the sequential use of UV irradiation and chlorine to disinfect reclaimed water | |
| CN109002688B (en) | Water treatment method based on ozone disinfection/ultraviolet disinfection/chlorine disinfection | |
| Watts et al. | Comparative OH radical oxidation using UV-Cl2 and UV-H2O2 processes | |
| Xiao et al. | Pilot study on bromate reduction from drinking water by UV/sulfite systems: economic cost comparisons, effects of environmental parameters and mechanisms | |
| Wang et al. | Rapid degradation of norfloxacin by VUV/Fe2+/H2O2 over a wide initial pH: Process parameters, synergistic mechanism, and influencing factors | |
| Rodríguez‐Chueca et al. | Conventional and advanced oxidation processes used in disinfection of treated urban wastewater | |
| Seid et al. | UV/sulfite chemistry to reduce N-nitrosodimethylamine formation in chlor (am) inated water | |
| Ye et al. | Role of ammonia on haloacetonitriles and halonitromethanes formation during ultraviolet irradiation followed by chlorination/chloramination | |
| CN101318728A (en) | Ultraviolet light catalysis disinfection method by chlorine dioxide for water | |
| CN103508511A (en) | Method for treating ofloxacin-containing waste water with electron beam irradiation technology | |
| Jun et al. | Radiolysis of pentachlorophenol (PCP) in aqueous solution by gamma radiation | |
| CN111056615B (en) | Method for treating algal bloom or red tide by intermittently combining ultraviolet rays and hydrogen peroxide | |
| Yan et al. | Degradation mechanisms of cyanobacteria neurotoxin β-N-methylamino-l-alanine (BMAA) during UV254/H2O2 process: Kinetics and pathways | |
| CN109293098A (en) | A method of it is generated using UV-LED light source control Disinfection Byproducts in Drinking Water | |
| US6982039B1 (en) | Method for improving ultraviolet radiation disinfection of water using aqueous silver | |
| Tak et al. | A review on disinfection and disinfection byproducts | |
| CN111115749A (en) | Method for treating pesticide pollution of molinate in water | |
| JP3110034B2 (en) | Method to remove organic matter and dissolved oxygen simultaneously | |
| Sorlini et al. | Arsenic oxidation by UV radiation combined with hydrogen peroxide | |
| CN112777677A (en) | Method for degrading smelly substances in water based on disinfection technology | |
| CN212356877U (en) | Photocatalysis decomposition device of bromate | |
| Ghaneian et al. | The effect of nitrate as a radical scavenger for the removal of humic acid from aqueous solutions by electron beam irradiation |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200508 |