Ferric chloride - Import export

Treatment of raw sewage to prevent the production of hydrogen sulfide. Hydrogen Sulfide is a highly corrosive and poisonous gas that is produced after microbial breakdown on organic materials where oxygen is absent such as sewerage.

The chemical is highly reactive with other soluble metals and elements in the water; thus, it is used for coagulation. In the process the iron anions attach to the negative element ions in water to form a precipitate or suspended solid. These solids can then be removed from the water during filtration. This is a common method of purifying drinking water to as high as 85% purity.