A device and method for removing arsenic in water by electrochemical synergistic oxidation-flocculation with low energy consumption

A synergistic oxidation and electrochemical technology, applied in the field of water pollution remediation, can solve the problems of high pre-oxidation cost, high energy consumption of electrode reaction, etc., and achieve the effect of saving system energy consumption and eliminating the aeration link
CN105948183BActive Publication Date: 2019-01-29TSINGHUA UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
TSINGHUA UNIV
Publication Date
2019-01-29

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Abstract

The invention provides a low energy consumption device and method for removal of arsenic from water by electrochemistry coordinated oxidation-flocculation. The method employs a gas diffusion type air cathode to replace an iron cathode in common electric flocculation, utilizes the passive diffusion of oxygen in air to achieve in-situ formation of H2O2 on the surface of a catalyst layer, promotes the generation of active species (.OH and Fe(IV)), and rapidly oxidizes As(III) into As(V), anode generated metal ions (iron ions, aluminum ions or zinc ions) are hydrolyzed to generate a large number of flocs, and adsorption is carried out to remove As(V). Compared with traditional electric flocculation, the method not only can achieve efficient oxidation of As(III) and up-to-stand removal of total arsenic, also saves aeration energy consumption by about 200Wh.m<-3>, and reduces the electrode reaction energy consumption by 30-40%.
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Description

technical field

[0001] The invention belongs to the technical field of water pollution remediation, and in particular relates to a device and method for removing arsenic in a water body through electrochemical synergistic oxidation and flocculation with low energy consumption. Background technique

[0002] There are more than 70 countries in the world that have high-arsenic groundwater distribution, and hundreds of millions of people are facing the threat of high-arsenic groundwater. Chronic arsenic poisoning is a major endemic disease caused by drinking high-arsenic groundwater, and China is one of the countries most seriously affected by arsenic endemic diseases. According to the safe standard of arsenic content in drinking water (10 μg / L) recommended by WHO, there are more than 15 million people exposed to arsenic pollution in China, which poses a great threat to the safety of drinking water for residents. To do a good job in the prevention and control of endemic arsenic...

Claims

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