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Water treatment method for reducing N-nitrosodimethylamine in water by ferroferric oxide reinforced zero-valent iron

A technology of nitrosodimethylamine and iron ferric oxide, which is applied in the direction of reduced water/sewage treatment, water/sewage treatment, extracted water/sewage treatment, etc., can solve the problem of slow removal rate, increased treatment cost, and long reaction cycle and other problems, to achieve the effect of simple operation, low price and clean materials

Inactive Publication Date: 2020-07-28
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The biological method is economical and safe, but the reaction time is long, some up to several years; the adsorption material can absorb NDMA in water, but the adsorption material is easy to be saturated and needs to be replaced regularly, and it is unknown whether it can be safely recycled; the ultraviolet photolysis in the advanced oxidation method can Fast and efficient removal of NDMA, but additional energy consumption increases the treatment cost; metal reduction technology can reduce a variety of chlorinated organic compounds in water with zero-valent iron, and this technology has been widely used in soil and In-situ remediation of groundwater, but the removal rate of NDMA is slow and the reaction period is long

Method used

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  • Water treatment method for reducing N-nitrosodimethylamine in water by ferroferric oxide reinforced zero-valent iron
  • Water treatment method for reducing N-nitrosodimethylamine in water by ferroferric oxide reinforced zero-valent iron
  • Water treatment method for reducing N-nitrosodimethylamine in water by ferroferric oxide reinforced zero-valent iron

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Example 1: Reagents used in the experiment: iron powder (analytical pure), 4-hydroxyethylpiperazineethanesulfonic acid (analytical pure), ferric iron tetroxide (analytical pure), pure nitrosodimethylamine (>99 %), sodium hydroxide (analytical pure)

[0024] Instruments used in the experiment: rotary incubator (QB-328), PH meter (Lei Magnetic PHS-3C), high performance liquid chromatography (Shimadzu LC-20A), circulating water multi-purpose vacuum pump (SHB-ⅢA), extraction equipment ( brown extraction bottle)

[0025] Specific experimental steps: Prepare 4-hydroxyethylpiperazineethanesulfonic acid buffer solution (HEPES) with a mass concentration of 25 mmol L-1, add the prepared 1mol L-1 sodium hydroxide solution and adjust the pH of the solution with a pH meter value of 7, measure 40 mL of this solution into a brown extraction bottle, and add 10 g L-1 of iron powder, 10 g L-1 of ferric oxide and a certain amount of NDMA mother liquor to the reaction bottle in turn. The...

Embodiment 2

[0026] Example 2: Reagents used in the experiment: iron powder (analytical grade), 1,4-piperazine dipropanesulfonic acid (analytical grade), ferric iron tetroxide (analytical grade), pure nitrosodimethylamine (>99 %), sodium hydroxide (analytical pure)

[0027] Instruments used in the experiment: rotary incubator (QB-328), PH meter (Lei Magnetic PHS-3C), high performance liquid chromatography (Shimadzu LC-20A), circulating water multi-purpose vacuum pump (SHB-ⅢA), extraction equipment ( brown extraction bottle)

[0028] Specific experimental steps: Prepare 1,4-piperazine dipropanesulfonic acid buffer solution (PIPPS) with a mass concentration of 25 mmol L-1, add the prepared 1 mol L-1 sodium hydroxide solution and adjust the pH of the solution with a pH meter value of 4, measure 40 mL of this solution into a brown extraction bottle, and add 10 g L-1 iron powder, 10 g L-1 ferric oxide and a certain amount of NDMA mother liquor to the reaction bottle in order to make The initi...

Embodiment 3

[0029] Example 3: Reagents used in the experiment: iron powder (analytical pure), 4-hydroxyethylpiperazineethanesulfonic acid (analytical pure), ferric iron tetroxide (analytical pure), pure nitrosodimethylamine (>99 %), sodium hydroxide (analytical pure)

[0030] Instruments used in the experiment: rotary incubator (QB-328), PH meter (Lei Magnetic PHS-3C), high performance liquid chromatography (Shimadzu LC-20A), circulating water multi-purpose vacuum pump (SHB-ⅢA), extraction equipment ( brown extraction bottle)

[0031] Specific experimental steps: Prepare 4-hydroxyethylpiperazineethanesulfonic acid buffer solution (HEPES) with a mass concentration of 25 mmol L-1, add the prepared 1mol L-1 sodium hydroxide solution and adjust the pH of the solution with a pH meter value of 7, measure 40 mL of this solution into a brown extraction bottle, and add 10 g L-1 iron powder, 20 g L-1 ferric oxide and a certain amount of NDMA mother liquor to the reaction bottle in order to make it...

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Abstract

The invention discloses a water treatment method for reducing N-nitrosodimethylamine in water by ferroferric oxide reinforced zero-valent iron, comprising the following steps of: regulating the pH value of a buffer solution, which is any one of 1, 4-piperazine dipropanesulfonic acid and 4-hydroxyethyl piperazine ethanesulfonic acid; adding a buffer solution into extraction equipment, adding iron powder, ferroferric oxide and an NDMA mother solution into the extraction equipment, preparing a solution with the NDMA concentration of 100 [mu]g.L <-1> in the extraction equipment, and finally sealing; rotating the extraction equipment at a rotating speed for a certain period of time, and performing vacuum filtration through a filter membrane to obtain a water sample; and testing the NDMA concentration of the water sample through a liquid chromatograph. The method is based on the possible influence of ferroferric oxide on zero-valent iron; the two coexisting systems are applied to the NDMA removal reaction to find a technology which is low in cost, low in energy consumption and capable of effectively controlling a strong carcinogenic substance nitrosodimethylamine (NDMA) in water, so thatthe implementation path of a safety guarantee application technology of surface water and domestic drinking water is broadened.

Description

technical field [0001] The invention relates to the field of surface water treatment, in particular to a chemical method for strengthening zero-valent iron to reduce pollutants in water. Background technique [0002] N-Nitrosodimethylamine (NDMA) is a strong carcinogenic pollutant in water, which can enter living cells and mammals through various channels such as respiratory inhalation, digestive tract ingestion, and skin contact, causing gene mutations. In 1956, researchers first discovered that NDMA can cause poisoning and death in mice. The U.S. Environmental Protection Agency has determined that the mass concentration corresponding to its unit carcinogenic risk is 0.7 ng•L-1, and listed it as a B2 carcinogen. Numerous studies have found that NDMA, a by-product, is produced during chlorine and chloramine disinfection of drinking water. In domestic and foreign surveys, high concentrations of NDMA have been detected in urban drinking water treatment effluent, far exceeding ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F1/70C02F101/38
CPCC02F1/26C02F1/44C02F1/70C02F1/705C02F9/00C02F2101/38
Inventor 韩莹吴越黄俊恺刘宏远张克敏吴召陆青杰
Owner ZHEJIANG UNIV OF TECH