What are the treatment methods of arsenic-containing wastewater?

See what kind of wastewater you are dealing with.

If it is the treatment of arsenic-containing tailings wastewater in mining industry, it is generally treated with lime to precipitate it.

There are other methods, but they are more complicated.

Give a rough list

1 chemical treatment of arsenic-containing wastewater

Neutralization and precipitation method is a widely used method in engineering, and many people have conducted in-depth research in this field. The mechanism is that alkali (usually calcium hydroxide) is added to wastewater to improve its pH value, and then calcium arsenite, calcium arsenate and calcium fluoride can be precipitated. This method can remove most of arsenic and fluorine, and it is simple, but the sludge precipitation is slow, so it is difficult to purify the wastewater and discharge it up to the standard [4].

Flocculation precipitation method is the most widely used method to treat arsenic-containing wastewater at present. It is removed by adding Fe3+, Fe2+, Al3+ and Mg2+ plasmas (or original plasmas in wastewater) and adjusting the pH with alkali (usually calcium hydroxide) to form hydroxide colloid adsorption and react with arsenic in wastewater to generate insoluble salt precipitation. The concrete methods include lime aluminum salt method, lime high iron method and lime ferrous method [4].

Physical and chemical treatment of arsenic-containing wastewater

Physical and chemical methods generally use ion exchange, adsorption, extraction, reverse osmosis and other methods to remove arsenic from waste liquid.

3 Microbial treatment of arsenic-containing wastewater

Compared with traditional physical and chemical methods, microbial treatment of arsenic-containing wastewater has the advantages of economy, high efficiency and harmlessness, and has become the most promising method. Including: 1 activated sludge; 2. Bacteria and algae * * * life; 3. Inoculate bacteria by activated sludge method.