Water treatment method for removing trihalomethane in drinking water by utilizing UV (ultraviolet)/H2O2

A technology for trihalomethane and drinking water, applied in the field of water treatment, can solve problems such as high trihalomethane, and achieve the effects of simple reaction device, no secondary pollution and high efficiency

Inactive Publication Date: 2015-08-26
TIANJIN CHENGJIAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a kind of utilizing UV / H 2 o 2 A water treatment method for removing trihalomethanes in drinking water, in order to solve the problem that chlorine reacts with some organic substances in water treatment to produce higher concentrations of trihalomethanes

Method used

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  • Water treatment method for removing trihalomethane in drinking water by utilizing UV (ultraviolet)/H2O2
  • Water treatment method for removing trihalomethane in drinking water by utilizing UV (ultraviolet)/H2O2
  • Water treatment method for removing trihalomethane in drinking water by utilizing UV (ultraviolet)/H2O2

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Embodiment 1: Take 1 L of trihalomethane mixed solution prepared with drinking water in figure 1 In the reaction device shown, add hydrogen peroxide to the reaction device, the dosage of hydrogen peroxide is 10mmol / L, then put the 21W ultraviolet lamp with quartz sleeve that has been luminescent stably into the reaction solution, and turn on the magnetic stirring at the same time Take a certain volume of reaction solution from the sampling port at 0min, 1min, 3min, 5min, 10min, 20min, 35min and 60min, respectively, and analyze the concentration of trihalomethane components by headspace gas chromatography. Such as figure 2 Shown, time has bigger influence on trihalomethane removal rate, and tribromomethane removal rate reaches 99.71% in 10min, and removal rate changes little afterwards, and the removal rate of dibromochloromethane and monobromodichloromethane in 20min 94.28% and 92.06%, there is no obvious change in the removal rate after that, but the removal rate of ...

Embodiment 2

[0023] Example 2: Take 1L of the trihalomethane mixed solution prepared with drinking water in the reaction device, add hydrogen peroxide to the reaction device, the dosage of hydrogen peroxide is 5-30mmol / L, and then the luminescence has stabilized Put the 21W ultraviolet lamp with a quartz sleeve into the reaction solution, and turn on the magnetic stirrer at the same time. After reacting for 20 minutes, take a certain volume of the reaction solution from the sampling port, and use headspace gas chromatography to analyze the concentration of trihalomethane components. Such as image 3 As shown, the removal rate of each component of trihalomethane increases firstly and then decreases with the dosage of hydrogen peroxide. When the hydrogen dosage is 15mmol / L, the removal rate of dibromochloromethane reaches the maximum, which is 95.90%.

Embodiment 3

[0024] Embodiment 3: Take 1L of trihalomethane mixed solution prepared with domestic drinking water in the reaction device, add hydrogen peroxide to the reaction device, the dosage of hydrogen peroxide is 15mmol / L, and then put the luminescent stable band Put the ultraviolet lamp of the quartz sleeve into the reaction solution. The power of the ultraviolet lamp is 12-75W. At the same time, turn on the magnetic stirrer. After 20 minutes of reaction, take a certain volume of the reaction solution from the sampling port, and use headspace gas chromatography to analyze the trihalomethanes. component concentration. Such as Figure 4 As shown, the removal rate of each component of trihalomethane gradually increased. When the power of the ultraviolet lamp was 12W, 21W, 40W and 75W, the removal rate of trichloromethane was 13.58%, 25.06%, 32.36% and 41.41% respectively in 20 minutes. Three The removal rates of bromomethane were 84.60%, 98.42%, 99.58% and 99.61%, respectively, the rem...

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Abstract

The invention provides a water treatment method for removing trihalomethane in drinking water by utilizing UV (ultraviolet)/H2O2. The water treatment method comprises the following steps: introducing the drinking water into a reaction device, starting a magnetic stirrer in the reaction device, and adjusting the rotational speed of the magnetic stirrer to be 125-300 r/min; putting a UV lamp tube capable of stably emitting light into the reaction device, and arranging a quartz sleeve tube outside the UV lamp tube; adding H2O2 into the drinking water in the reaction device for treatment, wherein the additive amount of H2O2 is 5-30 mmol/L, the power of a UV lamp is 12-75 W, and the retention time is 20-60 minutes; removing trichloromethane, tribromethane, dibromochloromethane and bromodichloromethane contained in trihalomethane in the treated drinking water, wherein the removal rates of trichloromethane, tribromethane, dibromochloromethane and bromodichloromethane can reach 43.97%, 99.61%, 99.38% and 93.07% respectively. The water treatment method has the benefits that the method is capable of completely decomposing trihalomethane, free of secondary pollution, low in H2O2 consumption and low in energy consumption, has a certain removal effect on TOC (total organic carbon) and UV254 in the drinking water, and has a very good removal effect on trihalomethane.

Description

technical field [0001] The invention relates to a water treatment method, in particular to a method utilizing UV / H 2 o 2 Water treatment methods for the removal of trihalomethanes from drinking water. Background technique [0002] At present, my country's surface water bodies are generally polluted to varying degrees, and the main pollutants are organic substances, and some organic substances in surface water can react with chlorine to form disinfection by-products after chlorine disinfection. There are more than 700 kinds of chlorine disinfection by-products that have been found at present, and the output of trihalomethanes (THMs) is the highest proportion of known disinfection by-products, accounting for 20.1%. THMs include chloroform, bromodichloromethane, di Bromochloromethane and bromoform four. Population epidemiological surveys found that the occurrence of rectal cancer and bladder cancer is related to long-term exposure to THMs levels in drinking water. In recent ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/32C02F1/72C02F101/36
Inventor 员建罗小平张平苑宏英李威
Owner TIANJIN CHENGJIAN UNIV
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