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

Discussion: Viraraghavan Thiruvenkatachari (See full record)
Closure: (See full record)

Abstract: 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: Calcium | Sulfates | Gypsum | Phosphate | Solubility | Wastes | Industries

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