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. 19, 2017
Filed:
Jul. 25, 2013
Degremont, Paris la Defense, FR;
Pierre-Emmanuel Pardo, Orsay, FR;
DEGREMONT, , FR;
Abstract
A process for reducing the production of sludge by municipal or industrial wastewater purification plants, comprising a step of mesophilic or thermophilic anaerobic digestion (), or anaerobic digestion combining these two operating modes, of a stream of sludge to be treated (), and at least one biological solubilization anaerobic treatment step (); the process comprises, upstream of the anaerobic digestion step, a step of dehydration () of the sludge to be treated, followed by a step of mixing () the dehydrated sludge with a recirculated fraction of sludge that is more liquid, originating from recycling of the digestion (), and/or from the anaerobic treatment step (), and/or centrates originating from a final dehydration () of the treated sludge, wherein the recirculation rate is chosen such that the mixture has a dryness suitable for digestion, this mixture then being directed towards the digestion.