Drinking water ozone oxidation device and process with low NDMA generation

A technology for ozone oxidation and drinking water, which is applied in the direction of oxidized water/sewage treatment, water pollutants, water/sewage treatment, etc. It can solve the problems of large consumption and high price of hydrogen peroxide, and reduce the amount of production and the cost of raw materials Inexpensive, the effect of reducing the reaction rate

Active Publication Date: 2021-11-30
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the inventor believes that the hydrogen peroxide used in this process is expensive and consumes a large amount, which brings a huge production cost burden to drinking water companies.

Method used

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  • Drinking water ozone oxidation device and process with low NDMA generation
  • Drinking water ozone oxidation device and process with low NDMA generation
  • Drinking water ozone oxidation device and process with low NDMA generation

Examples

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Effect test

Embodiment 1

[0041] Embodiment 1 Drinking water ozone oxidation device

[0042] A kind of drinking water ozone oxidation device, with reference to figure 1 , including a glass reactor 8, a first oxygen generator 1, a second oxygen generator 18, an ozone generator 2, a gas concentration analyzer 3, an ozone tail gas decomposer 4, a backwash pump 11 and a water outlet bucket 12.

[0043] refer to figure 2 Specifically, the glass reactor 8 is set in a hollow cylindrical shape, and a thermometer 5 and a barometer 6 are arranged outside the glass reactor 8, so as to monitor the temperature and air pressure in the glass reactor 8. Both ends of the glass reactor 8 are respectively connected with a water inlet pipe 14 and an outlet pipe 17 , and the side wall of the glass reactor 8 is connected with an inlet pipe 15 and an air outlet pipe 16 . The glass reactor 8 is provided with an ozone distribution disc 7 , a polytetrafluoroethylene hollow fiber membrane 9 and a membrane module 13 . The ozo...

Embodiment 2

[0049] Embodiment 2 river water ozone oxidation test

[0050] Water from a river was taken, and the water sample was filtered with a 0.45 μm water membrane. The sampling and detection of natural water body adopts a combination of triple quadrupole gas chromatography-mass spectrometer, high performance liquid chromatography-triple quadrupole mass spectrometry, high performance liquid chromatography, pH meter, ultraviolet spectrophotometer, etc. The detection method shows that the water mainly contains nitrite nitrogen of 0.051-0.248mg / L, nitrate nitrogen of 2.02-2.83mg / L, pH of 7.00-7.26, and temperature of 25°C. In order to facilitate the detection of changes in NDMA content in water before and after ozone oxidation, DMZ (working concentration: 2 μmol / L) was added to the filtered water samples.

[0051] After the above water sample was subjected to ozonation, the NDMA in the sample was extracted by liquid-liquid extraction with methylene chloride, and the treated water was an...

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Abstract

The invention belongs to the technical field of drinking water disinfection, and particularly relates to a drinking water ozone oxidation device and process with low NDMA generation. The device comprises a first oxygen generator, an ozone generator, a gas concentration analyzer, an ozone distribution disc, a polytetrafluoroethylene hollow fiber membrane and a glass reactor. The process comprises the following two steps: premixing an ozone catalyst and a water body; introducing ozone into the organic glass reactor; and enabling the premixed water body to flow through the polytetrafluoroethylene hollow fiber. The drinking water is subjected to ozone pre-oxidation by adding the ozone catalyst to strengthen a .OH oxidation path and limit a direct oxidation path of ozone molecules at the same time, the generation amount of NDMA in the ozone oxidation process is effectively reduced, and meanwhile, the method has the advantages of being low in production cost, convenient to maintain, capable of being recycled for multiple times, easy and convenient to operate, free of secondary pollution and the like.

Description

technical field [0001] The invention belongs to the technical field of drinking water disinfection. More specifically, it relates to a drinking water ozonation device and process with low NDMA generation. Background technique [0002] Some water sources in my country are seriously polluted, and drinking water is facing serious health risks. In order to ensure the safety of drinking water, it is necessary to disinfect the source water. Disinfection by-products are the inevitable products of the disinfection process of drinking water. In addition to the traditional halogenated disinfection by-products, the formation of nitrogen-containing disinfection by-products (N-DBPs) in drinking water has attracted more and more attention. The product is more toxic, carcinogenic and mutagenic. Relevant studies have shown that NDMA, NDEA, NDPA, NDPhA, NPYR, N-nitrosomethylethylamine (NMEA), N-nitrosodibutylamine (NDBA), N-nitrosodibutylamine (NDBA), and Nine N-nitrosamine by-products, n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/78C02F1/44C02F101/38
CPCC02F1/78C02F1/44C02F2201/782C02F2305/023C02F2101/38
Inventor 宋阳冯莎吴子烨秦雯王冠茗叶子健江进
Owner GUANGDONG UNIV OF TECH
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