US 12,434,983 B2
Method for treating water to reduce the dissolved silica content thereof
Bastien Riviere, Brueil en Vexin (FR); and Vincent Georgeaud, Jouy le Moutier (FR)
Assigned to Veolia Water Solutions & Technologies Support, Saint-Maurice (FR)
Appl. No. 17/620,897
Filed by Veolia Water Solutions & Technologies Support, Saint-Maurice (FR)
PCT Filed Jul. 13, 2020, PCT No. PCT/EP2020/069778
§ 371(c)(1), (2) Date Dec. 20, 2021,
PCT Pub. No. WO2021/009130, PCT Pub. Date Jan. 21, 2021.
Claims priority of application No. 1907868 (FR), filed on Jul. 12, 2019.
Prior Publication US 2022/0348480 A1, Nov. 3, 2022
Int. Cl. C02F 1/28 (2023.01); B01J 20/06 (2006.01); B01J 20/28 (2006.01); B01J 20/34 (2006.01); C02F 1/00 (2023.01); C02F 101/10 (2006.01)
CPC C02F 1/281 (2013.01) [B01J 20/06 (2013.01); B01J 20/28004 (2013.01); B01J 20/28016 (2013.01); B01J 20/3433 (2013.01); B01J 20/3475 (2013.01); C02F 1/008 (2013.01); C02F 2101/10 (2013.01); C02F 2209/40 (2013.01); C02F 2303/16 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A method of treating water containing dissolved silica and removing the dissolved silica from the water, comprising:
directing the water containing dissolved silica into a reactor containing an adsorbent granular material including iron hydroxide (III) or iron oxyhydroxide (III) and akaganeite;
passing the water containing the dissolved silica through the reactor and contacting the water with said adsorbent granular material;
reducing the concentration of dissolved silica in the water by adsorbing the silica in the water onto the adsorbent granular material, thereby forming treated water;
directing the treated water from the reactor;
at selected times, regenerating the adsorbent granular material by:
employing a regeneration solution containing a base and chloride ions;
ceasing to flow the water through the reactor;
directing the regeneration solution through the reactor and through the adsorbent granular material therein;
transferring silica adsorbed onto the adsorbent granular material to the regeneration solution; and
directing the regeneration solution containing the silica from the reactor.