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:
Jun. 23, 2015
Filed:
Apr. 30, 2010
Rüdiger Wissemborski, Gau-Algesheim, DE;
Rainer Schnee, Mainz, DE;
Rainer Wallwitz, Niedernhausen, DE;
David Kümmet, Budenheim, DE;
Rüdiger Wissemborski, Gau-Algesheim, DE;
Rainer Schnee, Mainz, DE;
Rainer Wallwitz, Niedernhausen, DE;
David Kümmet, Budenheim, DE;
CHEMISCHE FABRIK BUDENHEIM KG, Budenheim, DE;
Abstract
A process for recovering reusable materials, in particular phosphate, from sewage sludge products, namely sewage sludge, sewage sludge ash or sewage sludge slag, by extraction, in which a suspension of the sewage sludge product is produced in water, alcohol, water-alcohol mixture or an aqueous solution, gaseous carbon dioxide (CO) or supercritical carbon dioxide (scCO) is introduced as an extraction agent into the suspension of the sewage sludge product, undissolved solids are separated from the liquid suspension agent, carbon dioxide is removed from the suspension agent, and reusable materials dissolved in the suspension agent are precipitated and separated from the suspension agent.