CN113371901A - Method for controlling bromate and brominated disinfection byproducts in drinking water - Google Patents
Method for controlling bromate and brominated disinfection byproducts in drinking water Download PDFInfo
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- 238000004659 sterilization and disinfection Methods 0.000 title claims abstract description 56
- 239000006227 byproduct Substances 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims abstract description 39
- SXDBWCPKPHAZSM-UHFFFAOYSA-M bromate Inorganic materials [O-]Br(=O)=O SXDBWCPKPHAZSM-UHFFFAOYSA-M 0.000 title claims abstract description 32
- SXDBWCPKPHAZSM-UHFFFAOYSA-N bromic acid Chemical compound OBr(=O)=O SXDBWCPKPHAZSM-UHFFFAOYSA-N 0.000 title claims abstract description 32
- 239000003651 drinking water Substances 0.000 title claims abstract description 26
- 235000020188 drinking water Nutrition 0.000 title claims abstract description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 63
- QDHHCQZDFGDHMP-UHFFFAOYSA-N Chloramine Chemical compound ClN QDHHCQZDFGDHMP-UHFFFAOYSA-N 0.000 claims abstract description 41
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims abstract description 25
- CPELXLSAUQHCOX-UHFFFAOYSA-M Bromide Chemical compound [Br-] CPELXLSAUQHCOX-UHFFFAOYSA-M 0.000 claims abstract description 17
- 238000005273 aeration Methods 0.000 claims abstract description 15
- JRKICGRDRMAZLK-UHFFFAOYSA-L peroxydisulfate Chemical compound [O-]S(=O)(=O)OOS([O-])(=O)=O JRKICGRDRMAZLK-UHFFFAOYSA-L 0.000 claims abstract description 15
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000001257 hydrogen Substances 0.000 claims abstract description 13
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 13
- 230000003647 oxidation Effects 0.000 claims abstract description 4
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 4
- 229940006460 bromide ion Drugs 0.000 claims abstract description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 10
- 238000006243 chemical reaction Methods 0.000 claims description 7
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 6
- 239000002253 acid Substances 0.000 claims description 5
- 230000035484 reaction time Effects 0.000 claims description 4
- 239000005446 dissolved organic matter Substances 0.000 claims 1
- 238000002242 deionisation method Methods 0.000 abstract description 6
- 238000005516 engineering process Methods 0.000 abstract description 6
- 238000010276 construction Methods 0.000 abstract description 3
- 238000005374 membrane filtration Methods 0.000 abstract description 3
- 239000008213 purified water Substances 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 244000005700 microbiome Species 0.000 abstract 1
- 231100000331 toxic Toxicity 0.000 abstract 1
- 230000002588 toxic effect Effects 0.000 abstract 1
- 239000000243 solution Substances 0.000 description 9
- 230000015572 biosynthetic process Effects 0.000 description 6
- 238000001514 detection method Methods 0.000 description 5
- -1 halogen ions Chemical class 0.000 description 5
- CIWBSHSKHKDKBQ-JLAZNSOCSA-N Ascorbic acid Chemical compound OC[C@H](O)[C@H]1OC(=O)C(O)=C1O CIWBSHSKHKDKBQ-JLAZNSOCSA-N 0.000 description 4
- WKBOTKDWSSQWDR-UHFFFAOYSA-N Bromine atom Chemical compound [Br] WKBOTKDWSSQWDR-UHFFFAOYSA-N 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- GDTBXPJZTBHREO-UHFFFAOYSA-N bromine Substances BrBr GDTBXPJZTBHREO-UHFFFAOYSA-N 0.000 description 4
- 229910052794 bromium Inorganic materials 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 150000002500 ions Chemical class 0.000 description 4
- 238000002156 mixing Methods 0.000 description 4
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 4
- 239000004810 polytetrafluoroethylene Substances 0.000 description 4
- HDMGAZBPFLDBCX-UHFFFAOYSA-M potassium;sulfooxy sulfate Chemical compound [K+].OS(=O)(=O)OOS([O-])(=O)=O HDMGAZBPFLDBCX-UHFFFAOYSA-M 0.000 description 4
- 238000007789 sealing Methods 0.000 description 4
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 3
- 239000012159 carrier gas Substances 0.000 description 3
- 239000003153 chemical reaction reagent Substances 0.000 description 3
- 229910052801 chlorine Inorganic materials 0.000 description 3
- 239000000460 chlorine Substances 0.000 description 3
- 239000002243 precursor Substances 0.000 description 3
- WDNIHYDTZZOFLR-UHFFFAOYSA-N 2,2,2-tribromoacetonitrile Chemical compound BrC(Br)(Br)C#N WDNIHYDTZZOFLR-UHFFFAOYSA-N 0.000 description 2
- YUIKPESWSMJSMP-UHFFFAOYSA-N 2,2-dibromoacetamide Chemical compound NC(=O)C(Br)Br YUIKPESWSMJSMP-UHFFFAOYSA-N 0.000 description 2
- NDSBDLSWTGLNQA-UHFFFAOYSA-N Dibromoacetonitrile Chemical compound BrC(Br)C#N NDSBDLSWTGLNQA-UHFFFAOYSA-N 0.000 description 2
- BZLVMXJERCGZMT-UHFFFAOYSA-N Methyl tert-butyl ether Chemical compound COC(C)(C)C BZLVMXJERCGZMT-UHFFFAOYSA-N 0.000 description 2
- 229960005070 ascorbic acid Drugs 0.000 description 2
- 235000010323 ascorbic acid Nutrition 0.000 description 2
- 239000011668 ascorbic acid Substances 0.000 description 2
- 231100000086 high toxicity Toxicity 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 230000000813 microbial effect Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 206010005003 Bladder cancer Diseases 0.000 description 1
- 208000015634 Rectal Neoplasms Diseases 0.000 description 1
- 208000007097 Urinary Bladder Neoplasms Diseases 0.000 description 1
- 150000001450 anions Chemical class 0.000 description 1
- 239000000645 desinfectant Substances 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 238000000622 liquid--liquid extraction Methods 0.000 description 1
- 238000001819 mass spectrum Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 125000005385 peroxodisulfate group Chemical group 0.000 description 1
- 230000035935 pregnancy Effects 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 239000000376 reactant Substances 0.000 description 1
- 206010038038 rectal cancer Diseases 0.000 description 1
- 201000001275 rectum cancer Diseases 0.000 description 1
- 238000000638 solvent extraction Methods 0.000 description 1
- 230000001954 sterilising effect Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 201000005112 urinary bladder cancer Diseases 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/722—Oxidation by peroxides
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/78—Treatment of water, waste water, or sewage by oxidation with ozone
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/12—Halogens or halogen-containing compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F7/00—Aeration of stretches of water
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- 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)
- Treatment Of Water By Oxidation Or Reduction (AREA)
Abstract
本发明公开了一种控制饮用水中溴酸盐及溴代消毒副产物的方法，包括以下步骤：S110、使用酸液调节含有溴离子和溶解性有机物的原水体的pH值至4‑7，得到预处理原水；S120、向预处理原水内投入预氧化后的过硫酸氢盐，过硫酸氢盐与溴离子的摩尔浓度比为1:0.5‑2，同时施加曝气；S130、向曝气后的水体内投加浓度为0.5‑4mg/L的臭氧；S140、向经过步骤S130臭氧处理后的水体内部加入氯胺，并避光反应24‑48h。有益效果在于：减少后续消毒过程中产生的高毒性溴酸盐和溴代消毒副产物，提高净水水质，保证饮用水处理的安全性；该工艺操作便捷，工艺实施成本低，且相对于微生物电容去离子技术和膜滤去离子技术，不需要增加水处理设备和水厂构筑物，可节省水厂的建设成本。The invention discloses a method for controlling bromate and brominated disinfection by-products in drinking water. Obtain pretreated raw water; S120, drop into the pretreated raw water the hydrogen persulfate after pre-oxidation, the molar concentration ratio of hydrogen persulfate and bromide ion is 1:0.5-2, apply aeration simultaneously; S130, to aeration Add ozone with a concentration of 0.5-4 mg/L into the water after; S140, add chloramine to the water after the ozone treatment in step S130, and react in the dark for 24-48 hours. The beneficial effects are: reducing the highly toxic bromate and brominated disinfection by-products produced in the subsequent disinfection process, improving the quality of purified water, and ensuring the safety of drinking water treatment; the process is convenient to operate, low in process implementation cost, and compared to microorganisms. Capacitive deionization technology and membrane filtration deionization technology do not need to increase water treatment equipment and water plant structures, which can save the construction cost of water plants.
Description
Technical Field
The invention relates to the technical field of drinking water treatment, in particular to a method for controlling bromate and brominated disinfection byproducts in drinking water.
Background
In drinking water treatment, residues such as halogen ions and organic substances remain in treated water, and the residues react with a disinfectant to generate disinfection byproducts, which are widely noticed due to potential correlation with the increase of the incidence of diseases such as bladder cancer, rectal cancer and poor pregnancy. In particular, the toxicity of bromate and brominated disinfection byproducts is 2 to 3 orders of magnitude higher than that of the conventional disinfection byproducts brought into the water quality management standard, seriously threatens the health of drinking water and needs to be controlled. There are three main methods of conventional disinfection by-product control: 1. precursor substances in water are removed before source control disinfection, reactants are lacked, and disinfection byproducts cannot be generated; 2. process control is primarily directed to reducing the formation of disinfection byproducts during the disinfection process by changing the disinfection process parameters or the mode of disinfection. Changing disinfection process parameters on the basis of ensuring disinfection and sterilization effects, and reducing the disinfection dose of chlorine by combining disinfection instead of original chlorine disinfection, thereby controlling the amount of disinfection byproducts; 3. the terminal control removes the generated disinfection by-products, and the existence of the precursor and the residual chlorine can also continue to generate the disinfection by-products in the pipe network conveying process, so that the disinfection by-products cannot be eradicated. Therefore, before disinfection, the precursor is efficiently removed by adding pretreatment measures in combination with the conditions of reagents of a water plant, so that the source control of the nitrogenous disinfection byproducts is realized, and the water treatment process capable of effectively realizing the source control is not available at present.
Disclosure of Invention
The invention aims to solve the problems and provide a method for controlling bromate and brominated disinfection byproducts in drinking water, and a preferable technical scheme in the technical schemes provided by the invention comprises the following steps: the method can remove bromide ions of raw water from the source, reduce the generation of disinfection byproducts, improve the safety of drinking water, and has the technical effects of convenient operation, low process cost and the like, which are explained in detail below.
In order to achieve the purpose, the invention provides the following technical scheme:
the invention provides a method for controlling bromate and brominated disinfection byproducts in drinking water, which comprises the following steps:
s110, adjusting the pH value of a raw water body containing bromide ions and soluble organic matters to 4-7 by using acid liquor to obtain pretreated raw water;
s120, adding preoxidized hydrogen persulfate into the pretreated raw water, wherein the molar concentration ratio of the hydrogen persulfate to bromide ions is 1:0.5-2, and simultaneously applying aeration;
s130, adding ozone with the concentration of 0.5-4mg/L into the aerated water body;
and S140, adding chloramine into the water body treated by the ozone in the step S130, and reacting for 24-48h in a dark place.
Preferably, in step S110, the acid solution is one or a combination of two of hydrochloric acid and sulfuric acid.
Preferably, in step S110, the pH of the pretreated raw water is 5.
Preferably, in step S120, the peroxodisulfate has a pre-oxidation time of 1 to 12 hours.
Preferably, in the step S120, the intensity of the applied aeration is 1-5L/min, and the aeration time is 10-40 min.
Preferably, in the step S130, the adding concentration of the ozone is 1-3mg/L, and the contact reaction time of the ozone and the water body is 1-6 h.
Preferably, in the step S130, the adding concentration of the ozone is 2mg/L, and the contact reaction time of the ozone and the water body is 2 hours.
Preferably, in step S140, the chloramine is added in an amount such that the chloramine remains in an amount of 0.5 to 1.5mg/L after 24 hours of reaction.
Preferably, in step S140, the chloramine is added in an amount such that the remaining chloramine amount is 1mg/L after 24 hours of reaction.
Preferably, in step S140, the temperature of the light-shielding reaction between the ozone-treated water body and chloramine is 18 ℃ to 22 ℃.
In conclusion, the beneficial effects of the invention are as follows: 1. the hydrogen persulfate and the ozone adopted by the process are environment-friendly reagents, and the hydrogen persulfate oxidizes bromide ions to generate bromine, and then the bromine can be taken out from the water body through aeration, so that the bromide ions in the original water body can be removed from the source, high-toxicity bromate and brominated disinfection byproducts generated in the subsequent disinfection process are reduced, the water quality of purified water is improved, and the safety of drinking water treatment is ensured;
2. the process is convenient to operate and low in implementation cost, and compared with a microbial capacitance deionization technology and a membrane filtration deionization technology, water treatment equipment and water plant structures do not need to be added, so that the construction cost of a water plant can be saved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a graph showing the reduction in the formation of bromate and brominated disinfection byproducts in water bodies in examples 1 and 2 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
The invention provides a method for controlling bromate and brominated disinfection byproducts in drinking water, which comprises the following steps:
s110, adjusting the pH value of a raw water body containing bromide ions and soluble organic matters to 4-7 by using acid liquor to obtain pretreated raw water;
s120, adding preoxidized hydrogen persulfate into the pretreated raw water, wherein the molar concentration ratio of the hydrogen persulfate to bromide ions is 1:0.5-2, and simultaneously applying aeration;
s130, adding ozone with the concentration of 0.5-4mg/L into the aerated water body;
and S140, adding chloramine into the water body treated by the ozone in the step S130, and reacting for 24-48h in a dark place.
In the method, the reaction equation of the peroxydisulfate and bromide ions is as follows:
the determination method of the brominated disinfection by-products comprises the following steps: firstly, carrying out liquid-liquid extraction on a water sample subjected to preoxidation, namely: a water sample passes through a 0.45-micrometer microporous filter membrane, and a certain amount of ascorbic acid is added into the water sample to eliminate residual chloramine in the water, wherein the adding amount (by molar concentration) of the ascorbic acid is 1-2 times of that of the residual chloramine in the water; then 2mL of methyl tert-butyl ether is added as an extractant and placed on a test tube oscillator to oscillate for 2min, the mixture is kept stand for 5min, 1mL of the extractant solution on the upper layer is absorbed by a pipette and placed in a sample introduction bottle, the sample introduction bottle is placed in an automatic sample injector, then a gas chromatography-mass spectrometer is used for measurement, and the test result is shown in figure 1.
Wherein, the parameter setting of above-mentioned instrument is as follows: an RTX-5MS capillary column (the column length is 30m, the inner diameter is 0.25mm, the membrane is 2.5 mu m later) is adopted, the detection carrier gas is high-purity helium, the flow control mode of the carrier gas is pressure control, the column head pressure is 100-140KPa, the flow rate of the carrier gas is 34mL/min, the sample injection amount is 1 mu l, the sample injection mode is non-split flow, the sample injection port temperature is 220 ℃, the temperature of a mass spectrum detector is 250 ℃, the ion source is an electron impact ion source (EI), the electron energy is 70ev, the scanning mass range is 50-300m/z, the detection mode is selected ion detection (SIM), the initial temperature of a temperature raising program is 40 ℃, the temperature is kept for 3min, the temperature is raised to 260 ℃ at the speed of 10 ℃/min, and the temperature is kept for 3 min.
The detection method of bromate is as follows: an ion chromatograph (model ICS-1100) was used, equipped with an autosampler, a conductivity detector, and AS23 column, anion suppressor. The temperature of the conductivity detection cell is 30 ℃, the flow rate of the mobile phase is NaHCO3-NaCO3, the flow rate of the mobile phase is 1mL/min, the sample injection volume is 100 mu L, and the current of the suppressor is 25 mA.
The specific embodiment is as follows:
example 1
Adjusting the pH value of a raw water body containing 5mg/L of soluble organic carbon and 1mg/L of bromide ions with 0.1mol/L of hydrochloric acid to 5, then adding 0.4mg/L of potassium hydrogen persulfate solution, aerating at the same time, wherein the aeration intensity is 3.5L/min, aerating for 15min, and then adding 2mg/L of ozone to react for 3 h; adding 10mg/L chloramine, measuring the concentration of the residual chloramine after reacting for 24 hours, and calculating the consumed chloramine amount; adding 1mg/L chloramine according to the concentration of the consumed chloramine, adding the chloramine, immediately sealing a container by using a screw cap with a polytetrafluoroethylene gasket, fully mixing, storing in a thermostat, and reacting for 24 hours in a dark place while keeping the temperature at 20 ℃, thereby controlling bromate and brominated disinfection byproducts.
Example 2:
adjusting the pH value of a raw water body containing 2mg/L soluble organic carbon and 0.2mg/L bromide ion to 6.2 by using 0.1mol/L hydrochloric acid, then adding 0.6mg/L potassium hydrogen persulfate solution, aerating at the same time, wherein the aeration intensity is 4L/min, aerating for 20 minutes, and adding 3mg/L ozone to react for 2 hours; adding 10mg/L chloramine, measuring the concentration of the residual chloramine after reacting for 24 hours, and calculating the consumed chloramine amount; adding 1mg/L chloramine according to the concentration of the consumed chloramine, adding the chloramine, immediately sealing by using a screw cap with a polytetrafluoroethylene gasket, fully mixing, storing in a thermostat, and reacting for 24 hours in a dark place while keeping the temperature at 20 ℃, thereby controlling bromate and brominated disinfection byproducts.
Example 3:
adjusting the pH value of a raw water body containing 2mg/L soluble organic carbon and 0.2mg/L bromide ions to 5.6 by using 0.1mol/L hydrochloric acid, then adding 0.5mg/L potassium hydrogen persulfate solution, aerating at the same time, wherein the aeration intensity is 4L/min, aerating for 20 minutes, and adding 2mg/L ozone to react for 2 hours; adding 10mg/L chloramine, measuring the concentration of the residual chloramine after reacting for 36h, and calculating the consumed chloramine amount; adding 1mg/L chloramine according to the concentration of the consumed chloramine, adding the chloramine, immediately sealing by using a screw cap with a polytetrafluoroethylene gasket, fully mixing, storing in a thermostat, and reacting for 24 hours in a dark place while keeping the temperature at 20 ℃, thereby controlling bromate and brominated disinfection byproducts.
Example 4:
adjusting the pH value of a raw water body containing 2mg/L soluble organic carbon and 0.2mg/L bromide ions to 6.6 by using 0.1mol/L sulfuric acid, then adding 0.6mg/L potassium hydrogen persulfate solution, aerating at the same time, wherein the aeration intensity is 4L/min, aerating for 20 minutes, and adding 2mg/L ozone to react for 5 hours; adding 10mg/L chloramine, measuring the concentration of the residual chloramine after reacting for 48 hours, and calculating the consumed chloramine amount; adding 1mg/L chloramine according to the concentration of the consumed chloramine, adding the chloramine, immediately sealing by using a screw cap with a polytetrafluoroethylene gasket, fully mixing, storing in a thermostat, and reacting for 24 hours in a dark place while keeping the temperature at 20 ℃, thereby controlling bromate and brominated disinfection byproducts.
The reduction rates of bromate and brominated disinfection byproducts in water bodies treated in examples 1 to 4 are shown in fig. 1, and as can be seen from fig. 1, the method for effectively controlling bromate and brominated disinfection byproducts in drinking water by using combination disinfection of hydrogen persulfate/ozone/chloramine has a good control effect on bromate, dibromoacetonitrile, tribromoacetonitrile and dibromoacetamide, wherein the reduction rate of bromate formation is 40.2-55.5%, the reduction rate of dibromoacetonitrile formation is 38.9-48.7%, the reduction rate of tribromoacetonitrile formation is 38.1-47.2, and the reduction rate of dibromoacetamide formation is 35.6-40.1%, and are both far below safe threshold values of drinking water, so that the method has a good inhibition effect on bromate and brominated disinfection byproducts in water bodies treated by the method disclosed by the invention.
The hydrogen persulfate and the ozone adopted by the process are environment-friendly reagents, and the hydrogen persulfate oxidizes bromide ions to generate bromine, and then the bromine can be taken out from the water body through aeration, so that the bromide ions in the original water body can be removed from the source, high-toxicity bromate and brominated disinfection byproducts generated in the subsequent disinfection process are reduced, the water quality of purified water is improved, and the safety of drinking water treatment is ensured; the process is convenient to operate and low in implementation cost, and compared with a microbial capacitance deionization technology and a membrane filtration deionization technology, water treatment equipment and water plant structures do not need to be added, so that the construction cost of a water plant can be saved.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090272698A1 (en) * | 2008-05-01 | 2009-11-05 | John Hill | Bromate suppression |
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