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. 23, 2019
Filed:
Dec. 14, 2017
American Air Liquide, Inc., Fremont, CA (US);
Rovshan Mahmudov, Newark, DE (US);
Sylvester Zuttah, Bear, DE (US);
American Air Liquide, Inc., Fremont, CA (US);
Abstract
A method for recovery of aluminum hydroxide Al(OH)from an aluminum enriched water/wastewater treatment sludge is disclosed. The method includes the steps of: adding a hydrated lime slurry to the aluminum enriched water/wastewater treatment sludge to form an alkaline sludge; adding sodium carbonate NaCOto the alkaline sludge to form a NaCOtreated sludge; forming a first supernatant from the NaCOtreated sludge of step b) containing NaAl(OH); introducing COto the first supernatant to form a precipitate of Al(OH)and a second supernatant containing NaHCO; and recycling at least a portion of the NaHCOfrom the second supernatant back to the alkaline sludge of step a).