The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 21, 2015
Filed:
Jun. 23, 2011
Kashi Banerjee, Moon Township, PA (US);
Charles D. Blumenschein, Pittsburgh, PA (US);
Robert G. Cook, Montgomery, TX (US);
John C. Schrader, Pittsburgh, PA (US);
Kashi Banerjee, Moon Township, PA (US);
Charles D. Blumenschein, Pittsburgh, PA (US);
Robert G. Cook, Montgomery, TX (US);
John C. Schrader, Pittsburgh, PA (US);
Veolia Water Solutions & Technologies Support, Saint Maurice, FR;
Abstract
A method of reducing a sulfate concentration in wastewater comprises directing the wastewater stream to a precipitation reactor and mixing the wastewater stream with a calcium source and a calcium salt seed material to precipitate calcium sulfate. The precipitated calcium sulfate is then separated from a treated effluent and directed to a settling tank where the precipitated calcium sulfate is separated into heavier calcium sulfate precipitants and lighter calcium sulfate precipitants. The heavier calcium sulfate precipitants and the lighter calcium sulfate precipitants are separately recirculated to the precipitation reactor. A predetermined mass ratio of solids is maintained in the precipitation reactor.