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Method for removing arsenic in water through sulfite and ferric salt catalytic oxidation system

A sulfite, catalytic oxidation technology, applied in chemical instruments and methods, oxidized water/sewage treatment, water pollutants, etc., can solve the problems of complex operation process, low arsenic removal efficiency, high consumption of drugs, and achieve simple operation. , Significant economy, high arsenic removal efficiency

Pending Publication Date: 2019-06-28
HARBIN INST OF TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of high cost, low arsenic removal efficiency, complicated operation process, high consumption of medicines and excessive sludge production in the existing arsenic removal process, and to provide a catalytic oxidation method using sulfite and iron salts. Systematic method for removing arsenic from water

Method used

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  • Method for removing arsenic in water through sulfite and ferric salt catalytic oxidation system

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specific Embodiment approach 1

[0022] Specific Embodiment 1: In this embodiment, a method for removing arsenic in water by using a sulfite and iron salt catalytic oxidation system is completed according to the following steps:

[0023] 1. Add sulfite and iron salt to the arsenic-containing water to be treated to obtain water to be treated containing sulfite and iron salt;

[0024] The concentration of sulfite in the untreated water containing sulfite and iron salt described in step 1 is 0.1mmol / L~2mmol / L;

[0025] The concentration of iron salt in the untreated water containing sulfite and iron salt described in step 1 is 0.01mmol / L~0.1mmol / L;

[0026] 2. Adjust the pH value of the water to be treated containing sulfite and iron salt to 4-6, then stir the reaction, and then let it stand at room temperature to obtain effluent, that is, complete a catalytic oxidation process using sulfite and iron salt Systematic method for removing arsenic from water.

[0027] The advantage of this implementation mode:

...

specific Embodiment approach 2

[0034] Specific embodiment two: the difference between this embodiment and specific embodiment one is that the sulfite described in step one is one of sodium sulfite, potassium sulfite, calcium sulfite, sodium bisulfite and potassium bisulfite or a mixture of several of them. Other steps are the same as in the first embodiment.

specific Embodiment approach 3

[0035] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the iron salt described in step 1 is a mixture of one or both of ferric chloride and ferric sulfate. Other steps are the same as those in Embodiment 1 or 2.

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Abstract

The invention discloses a method for removing arsenic in water through a sulfite and ferric salt catalytic oxidation system, and relates to a method for removing arsenic in water. The method is aimedat solving the problems that an existing arsenic removal method is high in process cost, low in arsenic removal efficiency, complicated in operation process and too high in agent consumption and mud yield. The method includes the steps of adding sulfite and ferric salt to to-be-processed arsenic-containing water, adjusting the pH value to be 4-6, conducting stirring reaction, and conducting standing at a room temperature to obtain output water. Compared with a pure adsorption method, the method is low in agent consumption, high in processing efficiency and stable in effect, can remove 95% or above of organic arsenic and 98% or above of inorganic arsenic with 60 minutes and is suitable for removing the arsenic in water.

Description

technical field [0001] The invention relates to a method for removing arsenic in water. Background technique [0002] Arsenic (As) is a kind of metal element widely distributed in the earth's crust. It is recognized as a highly toxic and carcinogenic substance. However, frequent use leads to the increasing concentration and distribution range of arsenic in the water environment, which has a huge impact on aquatic animals and plants. At the same time, it may enter the human body indirectly through the enrichment of the food chain and pose a threat to human health. Long-term drinking of water with excessive arsenic may lead to a series of problems such as skin pigmentation, skin cancer, skin keratinization, cardiovascular disease, and liver cancer. Based on the toxicity and environmental safety of arsenic, my country has imposed certain restrictions on the concentration of arsenic in drinking water. The limit of arsenic concentration in the "Drinking Water Hygienic Standard" ...

Claims

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Application Information

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IPC IPC(8): C02F1/72C02F1/28C02F101/10
Inventor 马军丁健王盼新程海军王宪实曹影王桢张忠祥
Owner HARBIN INST OF TECH
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