Emerging and Innovative Technologies

Oral

384669 - Rapid Removal and Recovery of Phosphorus from Water using a NanoIron Sponge

Monday, June 4
10:30 AM - 12:00 PM
Location: Lakeshore C
Co-Authors: John Brockgreitens2004 Folwell Ave., St. Paul, MN 55108, St. Paul, MN – University of Minnesota; Abdennour Abbas, St. Paul, MN – University of Minnesota

Excess nutrients (phosphorus, nitrogen) in water leads to algal bloom, one of the most severe problems associated with surface water. Phosphorus is the limiting nutrient to control algal growth; therefore, removing phosphorus from surface water is a major strategy to prevent algal bloom in lakes and other water bodies. In this study, we present the development and evaluation of a NanoIron sponge as a phosphorus sorbent. Iron nanoparticles are grown directly on a polyurethane sponge using a proprietary technology involving thermal reduction. The results demonstrate that the NanoIron sponge can remove over 99% of phosphorus from water within 5 min. After passing the solution containing 10 mg L-1 phosphorus through the NanoIron sponge, phosphorus concentration dropped to the undetectable level (<2 µg L-1), below the US- Environmental Protection Agency (US-EPA) limit. The NanoIron sponge has an uptake capacity of over 116 mg g-1, up to 4 times the capacity of commercially available phosphorus sorbents. The used sponge can be regenerated and 100% of phosphorus recovered by simple immersion in the regeneration solution. Furthermore, the sponge exhibits antibacterial properties against cyanobacteria, which prevents biofouling and thus allows a long-term use of the sponge in real-world conditions.

Fatemeh Heidari

Student
University of Minnesota

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384669 - Rapid Removal and Recovery of Phosphorus from Water using a NanoIron Sponge



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