Water treatment procedure for reducing manganese content consists of passing over filter bed containing manganese dioxide granules

• Main Author: LEFORT FREDERIC
• Format: Patent
• Language: English; French
• Published: 10.05.2002
• Edition: 7
• Subjects: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY; CHEMISTRY; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; METALLURGY; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; SEPARATION; TECHNICAL SUBJECTS COVERED BY FORMER USPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ARTCOLLECTIONS [XRACs] AND DIGESTS; THEIR RELEVANT APPARATUS; TRANSPORTING; TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE

A water treatment process involves passing water over a bed of a filtering material made at least partly from manganese dioxide granules, where the granules make up at least 70% of the filter material by weight and are regenerated mechanically when necessary, periodically or when there is a predetermined loss of load. A water treatment process involves passing water over a bed of a filtering material (3) made at least partly from manganese dioxide granules having a size of 0.8-1 mm, an actual density of 3.5-4.5 and a hardness of at least 6 on the Mohs scale. The manganese dioxide granules make up at least 70% of the filter material by weight and are regenerated mechanically when necessary, periodically or when there is a predetermined loss of load. The regeneration can take the form of simple washing, using a flow of water and/or a gas such as air. Other materials in the filter bed can be sand, anthracite or active carbon granules, and the contact time with the water being treated is between 30 seconds and 10 minutes. La présente invention concerne un procédé de traitement des eaux destiné à la consommation humaine, en vue d'en éliminer le manganèse et éventuellement d'autres métaux comprenant les étapes consistant : - à faire transiter lesdites eaux sur au moins un lit de matériau filtrant (3) constitué au moins en partie de grains de bioxyde de manganèse, lesdits grains ayant une densité réelle comprise entre 3, 5 et 4, 5 et une dureté supérieure à 6 sur l'échelle de Mosh;- à régénérer, lorsque cela est nécessaire, ledit bioxyde de manganèse, ladite régénération étant effectuée mécaniquement.