Phosphate Removal Using Waste Calcium Sulfate

by Thomas L. Theis,
Gail A. Fromm,

Serial Information: Journal of the Environmental Engineering Division, 1977, Vol. 103, Issue 5, Pg. 951-955

Document Type: Journal Paper


Calcium sulfate (gypsum) is a common and inexpensive mineral which is among the cheapest sources of soluble calcium ion available. Relatively pure calcium sulfate is produced as a byproduct in several industries including chemical pharmaceutical (2) and, in the near future, it will also be produced by high sulfur coal-fired utilities which must remove stack gas S02. Thus, on a local basis it may be obtained at a markedly reduced cost, transportation being a major cost factor. This study was undertaken to explore the possibility of employing gypsum as a supplemental chemical for the removal of phosphate from wastewaters, and to determine under what conditions it can be utilized in this manner.

Subject Headings: Phosphate | Recycling | Calcium | Sulfates | Gypsum | Solubility | Industries | Sulfur

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