Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Perchlorate removal via IRON‐PRELOADED GAC and BOROHYDRIDE REGENERATION
Tailored granular activated carbon (GAC) can reduce groundwater perchlorate levels from 60–80 μg/L to below detection. Specifically, rapid small‐scale column tests, also called RSSCTs, showed that by preloading GAC with iron–oxalic acid, the GAC adsorption capacity could be improved up to 42%. When the preloaded GAC became saturated with perchlorate, 65–74% of the GAC's original adsorption capacity could be restored by chemically regenerating the GAC with sodium borohydride. This chemical regeneration could be achieved with the use of a small fraction of the water that had been processed during the water treatment cycle. The waste stream from chemical regeneration contained concentrated perchlorate levels as high as 7,000–15,000 μg/L. With this approach, the simulations described in this article indicated that when two tailored GAC beds were operated in series with a 40‐min empty‐bed contact time, they could provide water treatment service for 60–75 days during the first operations cycle; following chemical regeneration, the GAC beds could provide about an additional 30–40 days of water service for several successive treatment and regeneration cycles.
Perchlorate removal via IRON‐PRELOADED GAC and BOROHYDRIDE REGENERATION
Tailored granular activated carbon (GAC) can reduce groundwater perchlorate levels from 60–80 μg/L to below detection. Specifically, rapid small‐scale column tests, also called RSSCTs, showed that by preloading GAC with iron–oxalic acid, the GAC adsorption capacity could be improved up to 42%. When the preloaded GAC became saturated with perchlorate, 65–74% of the GAC's original adsorption capacity could be restored by chemically regenerating the GAC with sodium borohydride. This chemical regeneration could be achieved with the use of a small fraction of the water that had been processed during the water treatment cycle. The waste stream from chemical regeneration contained concentrated perchlorate levels as high as 7,000–15,000 μg/L. With this approach, the simulations described in this article indicated that when two tailored GAC beds were operated in series with a 40‐min empty‐bed contact time, they could provide water treatment service for 60–75 days during the first operations cycle; following chemical regeneration, the GAC beds could provide about an additional 30–40 days of water service for several successive treatment and regeneration cycles.
Perchlorate removal via IRON‐PRELOADED GAC and BOROHYDRIDE REGENERATION
Na, Chongzheng (Autor:in) / Cannon, Fred S. (Autor:in) / Hagerup, Ben (Autor:in)
Journal ‐ American Water Works Association ; 94 ; 90-102
01.11.2002
13 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Atrazine removal by preloaded GAC
| Wiley | 1999
Pesticide removal by GAC preloaded with natural organic matter
| Online Contents | 2002
| TIBKAT | 2024