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Method for strengthening arsenic removal effect of nano zero-valent iron by regulating and controlling oxygen content

A nano-zero-valent iron and oxygen content technology, which is applied in chemical instruments and methods, water treatment parameter control, contaminated groundwater/leachate treatment, etc., can solve the problems of increased cost and complicated preparation process, and improve the utilization rate , simple method and low cost effect

Active Publication Date: 2020-07-03
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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  • Method for strengthening arsenic removal effect of nano zero-valent iron by regulating and controlling oxygen content
  • Method for strengthening arsenic removal effect of nano zero-valent iron by regulating and controlling oxygen content
  • Method for strengthening arsenic removal effect of nano zero-valent iron by regulating and controlling 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 strengthening the arsenic removal effect of nano zero-valent iron by regulating and controlling the oxygen content. According to the method, the content of oxygenin the arsenic-containing wastewater and / or underground water is regulated and controlled to a proper range in an air / oxygen or inert gas aeration mode, the surface appearance of the nanoscale zero-valent iron is changed through a reaction of a proper amount of oxygen and the nanoscale zero-valent iron, and the arsenic removal effect of the nanoscale zero-valent iron is enhanced. The method disclosed by the invention has an obvious strengthening effect on removing arsenic (As (III) or As (V)) in different valence states from the nano zero-valent iron. The method can enhance the arsenic removaleffect of the in-situ or ex-situ nano zero-valent iron, and has the advantages of simple regulation and control mode, obvious enhancement effect, high treatment speed, environment friendliness, no secondary pollution and the like.

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 Applications(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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