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:
Sep. 21, 1999
Filed:
Jan. 11, 1995
Daniel M St Louis, MaComb, MI (US);
Haden Schweitzer Corporation, Madison Heights, MI (US);
Abstract
The present invention describes a process and an apparatus for treating sludge having both liquid and solid constituents. The sludge is first heated to a minimum optimum draining temperature. During heating, mechanical dewatering of the sludge occurs. In a preferred embodiment, a process is disclosed for treating waste paint sludge generated from a paint spraybooth, and heating is performed using microwave radiation. Liquid released from the paint sludge during dewatering can be recycled back to the spraybooth water, and vaporized exhaust generated during heating can either be condensed into liquid form and recycled, or incinerated and, preferably, sparged through untreated sludge to pre-heat it.