Water Treatment

Silicates are used in water treatment for various functions. Many water wells contain high levels of iron and manganese. Through aeration and chlorination, the waters are clarified, and precipitates form in the pipes through hydrolysis. The problem can be overcome by adding a few parts per million of sodium silicate. Such an addition is also made to reduce corrosion in drinking water or industrial water pipes. The silicate forms a molecular film on both ferrous and non-ferrous metals that prevents corrosion. Silicate is also used for wastewater treatment. The partial neutralization of the silicate with acid salts produces an anionic sol that is highly efficient as a coagulant aid and is used in conjunction with aluminum sulfate.