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Method for effectively controlling ozone oxidation byproducts and pollutants in water treatment process

An ozone oxidation and treatment process technology, applied in water/sewage treatment, chemical instruments and methods, oxidized water/sewage treatment, etc., can solve the problems of low reaction rate, high pH adjustment cost, accelerated ozone decomposition, etc., and achieves the scope of application Extensive, highly maneuverable, and easy-to-control effects

Pending Publication Date: 2020-08-14
舟山市自来水有限公司
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, these control methods have some drawbacks. Hydrogen peroxide pre-oxidation will accelerate the decomposition of ozone and affect its control effect on pollutants. Adding ammonia will introduce nitrogen sources, which will generate highly toxic nitrogen-containing by-products in the subsequent disinfection process. In the case of high pH, ​​the cost of adjusting pH is high
Studies have pointed out that the pre-oxidation of potassium permanganate (PM) can control the generation of bromate, but the reaction rate of potassium permanganate and many pollutants is low and the activity is poor. Therefore, it is necessary to develop an effective control of pollutants and ozone in the water treatment process. Methods of oxidation by-products and their necessity

Method used

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  • Method for effectively controlling ozone oxidation byproducts and pollutants in water treatment process

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Embodiment 1

[0025] 1) Take 8L raw water sample, filter it with a filter membrane with a pore size of 0.45 μm, divide it into 8 equal parts (respectively named A, B, C, D, E, F, G, H), and add pollutants to them respectively Trazine, the weight-to-volume ratio (unit) that makes Atrazine (ATR) and raw water is 150.0 μ g / L;

[0026] 2) Perform the following treatments on the 8 samples (A, B, C, D, E, F, G, H) in step 1) respectively: Sample A: add 1 mg / L to sample A in step 1) Potassium permanganate + 5mg / L sodium bisulfite, and adjust the pH to 7 with NaOH solution or HCl solution; stir with a rotor, pre-oxidation treatment time 20min; sample B: add 2mg / L to sample B in step 1) Potassium permanganate + 5mg / L sodium bisulfite, and adjust the pH to 7 with NaOH solution or HCl solution; stir with a rotor, pre-oxidation treatment time 20min;

[0027] Sample C: sample C in step 1) is not subjected to pre-oxidation treatment;

[0028] Sample D: add 5 mg / L sodium bisulfite to the sample D in ste...

Embodiment 2

[0039] 1) Pre-oxidation pre-oxidation treatment: the amount of water entering the plant is 3000t / h, the dosage of potassium permanganate is 1mg / L, the dosage of sodium bisulfite is 5mg / L, and the pre-oxidation treatment time is 20min; After water sample;

[0040]2) Ozone pretreatment: add ozone to the water sample after preoxidation treatment in step 1), make the concentration control of ozone be 3mg / L, ozone contact time 3min, obtain the water sample after ozone pretreatment;

[0041] 3) Coagulation and precipitation: add 25mg / L polyaluminum chloride to the water sample after ozone pretreatment in step 2);

[0042] 4) Pre-sand filter: use a single layer of quartz sand filter material, particle size d10 = 0.9mm, unevenness coefficient k80 = 1.4, thickness 1.2m; the lower layer is provided with a coarse sand layer, thickness 50mm, particle size 2.0 ~ 4.0mm. The design scale of the pre-sand filter is 80,000 m 3 / d, the filter material adopts a V-type filter with air-water back...

Embodiment 3

[0048] 1) Pre-oxidant pre-oxidation treatment: the amount of water entering the plant is 3000t / h, the dosage of potassium permanganate is 2mg / L, the dosage of sodium bisulfite is 5mg / L, and the pre-oxidation treatment time is 20min; After water sample;

[0049] 2) Ozone pretreatment: add ozone to the water sample after preoxidation treatment in step 1), make the concentration control of ozone be 3mg / L, ozone contact time 3min, obtain the water sample after ozone pretreatment;

[0050] 3) Coagulation and precipitation: add 24mg / L polyaluminum chloride to the water sample after ozone pretreatment in step 2);

[0051] 4) Pre-sand filter: use a single layer of quartz sand filter material, particle size d10 = 0.9mm, unevenness coefficient k80 = 1.4, thickness 1.2m; the lower layer is provided with a coarse sand layer, thickness 50mm, particle size 2.0 ~ 4.0mm. The design scale of the pre-sand filter is 80,000 m 3 / d, the filter material adopts a V-type filter with air-water backw...

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Abstract

The invention relates to the technical field of water treatment, in particular to a method for effectively controlling ozone oxidation byproducts and pollutants in a water treatment process. A pre-oxidant potassium permanganate / sodium hydrogen sulfite is added for pre-oxidation treatment before an ozone reaction, atrazine ATR can be effectively removed, the generation of bromate and trichloroacetaldehyde can be effectively inhibited, the removal of organic matters is ensured while controlling byproducts, and the method is an effective method for controlling pollutants and ozonation byproducts.The method is low in cost, easy to implement, convenient to control, high in operability and wide in application range.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a method for effectively controlling ozone oxidation by-products and pollutants in a water treatment process. Background technique [0002] In recent years, water pollution has been serious. The combination of ozone and activated carbon has excellent performance in the treatment of organic pollutants and control of odor substances, and has been more and more widely used. However, a series of by-products will be produced in the process of ozone oxidation. In the presence of bromide ions, carcinogenic bromate is usually produced. The U.S. Environmental Protection Agency stipulates a limit of 10 μg / L for bromate in drinking water. At the same time, ozone will increase the content of aldehydes and ketones in water, and aldehydes and ketones are important precursors of chloral (CH), which may increase the formation of chloral (CH) in the subsequent disinfection process. Due ...

Claims

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Application Information

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IPC IPC(8): C02F9/04
CPCC02F9/00C02F1/5245C02F2001/007C02F1/001C02F1/78C02F1/72
Inventor 李贤舟柯琦张孝洪
Owner 舟山市自来水有限公司
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