公开(公告)号：US20170137309A1

公开(公告)日：2017-05-18

申请号：US15129917

申请日：2015-03-23

Applicant: MS DEVELOPPEMENT ET PARTICIPATIONS ,  UNIVERSITE BLAISE PASCAL-CLERMONT II ,  CNRS CENTRE NATIONAL RECHERCHE SCIENTIFIQUE ,  ECOLE NATIONALE SUPERIEURE CHIMIE CLERMONT-FERRAND-ENSCCF

Inventor： Marcello BRIGANTE ,  Benoit CHAMPEAU ,  Alexandre GUILLAUME ,  Gilles MAILHOT ,  Romain PRULHO

IPC: C02F9/00

CPC classification number: C02F9/00 ,  C02F1/004 ,  C02F1/283 ,  C02F1/66 ,  C02F1/70 ,  C02F2001/007 ,  C02F2101/22 ,  C02F2209/06

Abstract: The method for reducing the chromium content, in particular the hexavalent chromium content, present in a liquid effluent loaded with solid particles, called the initial effluent (1), comprises at least one reduction step (9) by the addition, to the initial effluent, of a weak organic acid (10) in an amount sufficient to reduce the hexavalent chromium present in the initial effluent into a lower valency, namely into trivalent chromium, said step being followed by a step of discharging the treated liquid effluent, called the final effluent. It comprises at least a step of collecting the solid particles present in the initial effluent, at least by settling and a reduction step (9) which is performed after adjustment (12) of the pH of the initial effluent to a pH value lower than the initial pH of the initial effluent while remaining compatible with a discharge of the final effluent at this pH value. The invention also comprises a plant for implementing the method.