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Method for removing halogenated nitrogen-containing sterilization side products from drinking water

A technology for disinfection by-products and drinking water, applied in water pollutants, chemical instruments and methods, water/sewage multi-stage treatment, etc., can solve problems such as harsh technical conditions, and achieve the effect of low price, mild conditions and low cost

Inactive Publication Date: 2013-10-23
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

e aq - has a very active reduction characteristic (-2.77V), which can quickly undergo reduction reactions with pollutants, unfortunately, e aq -The production technical conditions are harsh (such as high-energy radiation), and there are many technical obstacles to be overcome in practice

Method used

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  • Method for removing halogenated nitrogen-containing sterilization side products from drinking water
  • Method for removing halogenated nitrogen-containing sterilization side products from drinking water
  • Method for removing halogenated nitrogen-containing sterilization side products from drinking water

Examples

Experimental program
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Effect test

Embodiment 1

[0039] Observe whether the drinking water that needs to remove halogenated nitrogen-containing disinfection by-products is clean drinking water, and confirm whether the water body is clear after standing. If it is found that the water body after standing still has sediment and is not clean, then simple pretreatment of the water body is required, such as sand filtration, activated carbon adsorption, etc.

[0040] After confirming that the water body is clean, add hydrogen peroxide, potassium persulfate and sodium bicarbonate to the water body, wherein the content of hydrogen peroxide in the water body is 20 μM, the content of potassium persulfate in the water body is 25 μM, and the content of sodium bicarbonate in the water body is 10 mM. After fully mixing, the pH is adjusted to be 7, and then the mixed solution is transported to the catalyst bed (column, internal diameter 5cm) with a pump at 20mL / min for contact reaction. The catalyst is zeolite (the surface hydroxyl density i...

Embodiment 2

[0043] After confirming that the water to be treated is clean, use a total organic carbon detector to detect the content of background organic matter (such as humic acid, fulvic acid, etc.) in the water. If the content is greater than 4mg / L, hydrogen peroxide and sodium persulfate must be injected Add it to the water body so that the concentration of hydrogen peroxide in the water body is 40 μM, and the concentration of sodium persulfate in the water body is 50 μM, mix for 10 minutes, then add sodium bicarbonate and mix well, so that the concentration of sodium bicarbonate in the water body is 10 mM, and adjust the pH to 7 , and then pump the mixed solution to the catalyst bed (column, inner diameter 5cm) with a pump at 20mL / min for contact reaction, the catalyst is γ-Al 2 o 3 (the surface hydroxyl density is 8.0×10 -5 M·m 2 , water contact angle of 48 degrees, purchased from Pingxiang City Huihua Packing Co., Ltd.), particle size of 40 mesh, filling height of 20cm, empty be...

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Abstract

The invention discloses a method for removing halogenated nitrogen-containing sterilization side products from drinking water. The method comprises the following steps of: (a) adding hydrogen peroxide, peroxysulphate and carbonate into the drinking water and uniform mixing to obtain a mixed solution, wherein the initial concentration of the hydrogen peroxide in the drinking water is controlled at 20-60mu M, the initial concentration of the carbonate is controlled at 1-10mM, and the molar concentration ratio of the hydrogen peroxide to the peroxysulphate is controlled at 1: (1-5); (b) transferring the mixed solution to a catalyst bed to carry out a contact reaction, wherein the empty bed contact time of the mixed solution inside the catalyst bed is 20 minutes-35minutes, and the catalyst bed is filled with a catalyst with a hydroxylated surface The method disclosed by the invention is mild in use condition, economical, free from secondary pollution, and high in efficiency of removing the halogenated nitrogen-containing sterilization side product from the drinking water.

Description

technical field [0001] The invention relates to the removal of pollutants in drinking water, in particular to a method for removing halogenated nitrogen-containing disinfection by-products in drinking water. Background technique [0002] Nitrogen-containing organics in drinking water can react with chlorine disinfectants to form halogenated nitrogen-containing disinfection by-products (H-N-DBPs), such as haloacetamides, cyanogen halides, haloacetonitrile, and halonitromethane, etc., generally expressed in μg / L concentration level exists in drinking water and has strong teratogenicity and mutagenicity. Therefore, the existence of H-N-DBPs poses a serious threat to human health and the water environment, and appropriate treatment must be taken to completely remove it from the water environment or reduce its concentration to a safe level. [0003] The technologies reported in the current literature to treat H-N-DBPs in water mainly include biodegradation, advanced oxidation, ...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F101/38
Inventor 刘小为张土乔张仪萍叶苗苗
Owner ZHEJIANG UNIV
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