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A method for enhancing the arsenic removal effect of nanometer zero-valent iron by regulating the oxygen content

A nano-zero valent iron, dissolved oxygen technology, applied in chemical instruments and methods, water treatment parameter control, polluted groundwater/leachate treatment, etc. , The method is simple, the effect of the removal effect is good

Active Publication Date: 2021-06-29
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods will introduce more chemical raw materials in the preparation process of nano-zero-valent iron, and the preparation process is relatively complicated and the cost increases

Method used

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  • A method for enhancing the arsenic removal effect of nanometer zero-valent iron by regulating the oxygen content
  • A method for enhancing the arsenic removal effect of nanometer zero-valent iron by regulating the oxygen content
  • A method for enhancing the arsenic removal effect of nanometer zero-valent iron by regulating the oxygen content

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Embodiment 1, the treatment of the waste water containing As (III)

[0045] 30mL of As(III)-containing wastewater (As(III) concentration 50mg·L -1 , pH value 7.2) were added to seven groups of vials respectively, and the dissolved oxygen in one group was adjusted to 2.05mg·L by aeration -1 , at the same time adjust the dissolved oxygen in other groups of reaction flasks by aeration to 0, 0.21, 0.51, 1.03, 4.10, 8.20mg·L -1 as a control group. Then add 0.2g·L respectively -1 Nano zero valent iron into the reaction bottle. After 6 hours of airtight reaction, the dissolved oxygen is 2.05mg·L -1 The concentration of As(III) in the vial dropped to 1.79mg·L -1, the removal rate was 96.41%; the concentration of As(III) in the control group decreased to 19.27, 12.78, 7.11, 2.51, 6.77, 9.88mg L -1 , and the removal rates were 61.23%, 74.28%, 85.70%, 94.96%, 86.39%, and 80.13%, respectively. When dissolved oxygen is 2.05mg·L -1 The removal rate of As(III) in the experimen...

Embodiment 2

[0046] Embodiment 2, the treatment of the waste water containing As (V)

[0047] 30mL of As(V)-containing wastewater (As(V) concentration 50mg·L -1 , pH value 7.2) were added to seven groups of vials respectively, and the dissolved oxygen in one group was adjusted to 2.05mg·L by aeration -1 , at the same time adjust the dissolved oxygen in other groups of reaction flasks by aeration to 0, 0.21, 0.51, 1.03, 4.10, 8.20mg·L -1 as a control group. Then add 0.2g·L respectively -1 Nano zero valent iron into the reaction bottle. After 6 hours of airtight reaction, the dissolved oxygen is 2.05mg·L -1 The concentration of As(V) in the vial dropped to 24.32mg·L -1 , the removal rate was 51.75%; the concentration of As(V) in the control group decreased to 38.01, 34.51, 30.62, 27.06, 33.76, 31.07mg L -1 , and the removal rates were 24.61%, 31.54%, 39.25%, 46.32%, 33.03%, and 38.36%, respectively. When dissolved oxygen is 2.05mg·L -1 The removal rate of As(V) in the experimental gr...

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Abstract

The invention discloses a method for enhancing the arsenic removal effect of nanometer zero-valent iron by adjusting and controlling the oxygen content. The invention adjusts the oxygen content of arsenic-containing wastewater and / or groundwater to a suitable range by aeration of air / oxygen or inert gas, changes the surface morphology of the nano-zero-valent iron by reacting an appropriate amount of oxygen with the nano-zero-valent iron, and strengthens its arsenic removal effect. The invention has obvious strengthening effect on the removal of arsenic (As(III) or As(V)) in different valence states by the nanometer zero-valent iron. The invention can enhance the arsenic removal effect of in-situ or ex-situ nanometer zero-valent iron, and has the advantages of simple control mode, obvious strengthening effect, fast processing speed, environmental protection and no secondary pollution.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a method for enhancing the arsenic removal effect of nano zero-valent iron by regulating and controlling the oxygen content. Background technique [0002] With the weathering, corrosion, and dissolution of arsenic-containing minerals under natural conditions, as well as artificial mining, mineral smelting, fossil fuel combustion, and agricultural activities, more than 70 countries on six continents around the world have the problem of excessive arsenic concentrations in drinking water. In some areas, the concentration of arsenic is as high as hundreds or even thousands of μg·L -1 , much higher than the drinking water standard of the World Health Organization (10μg·L -1 ). Because arsenic has certain biological toxicity and endangers the ecosystem, long-term drinking of arsenic-containing water may cause skin diseases, cardiovascular diseases, and various oth...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/70C02F1/28C02F101/10C02F103/06
CPCC02F1/281C02F1/705C02F2101/103C02F2103/06C02F2209/22
Inventor 栾富波孙路静孟颖
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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