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
CN111362390AActive Publication Date: 2020-07-03RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
Publication Date
2020-07-03

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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.
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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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