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Article

Development of a Regeneration Technique for Aluminum-Rich and Iron-Rich Phosphorus Sorption Materials

1
Department of Agricultural & Biological Engineering, Purdue University, West Lafayette, IN 47907, USA
2
National Soil Erosion Research Laboratory, USDA-ARS, West Lafayette, IN 47907, USA
*
Author to whom correspondence should be addressed.
Water 2020, 12(6), 1784; https://doi.org/10.3390/w12061784
Received: 22 May 2020 / Revised: 16 June 2020 / Accepted: 16 June 2020 / Published: 23 June 2020
The reduction of dissolved phosphorus (P) transport to water systems is of critical importance for water quality. Phosphorus sorption materials (PSMs) are media with high affinity for dissolved P, and therefore serve as the core components of P removal structures. These structures can intercept dissolved P in surface and subsurface flows, before discharge into water bodies. While the P removal ability of PSMs has been extensively studied, lesser is known about the capacity to regenerate and recover P from P-saturated PSMs. This article evaluates a methodology to recover the P removal ability of aluminum- and iron-rich P-saturated PSMs. A series of flow-through experiments were conducted, alternating between P sorption (0.5 and 50 mg L 1 P) and desorption with potassium hydroxide (KOH; 5 or 20 pore volumes [PV]), varying residence times (0.5 min and 10 min), and number of recirculations (0, 6 and 24). Across two cycles of sorption-desorption, Alcan, Biomax and PhosRedeem showed an average P recovery of 81%, 79%, and 7%, with standard deviation of 10%, 21% and 6%, respectively. The most effective regeneration treatment was characterized by the largest KOH volume (20 PV) and no recirculation, with up to 100% reported P recovery. Although KOH at 5 PV was less effective, the use of recirculation did increase P recovery. The lifetime of Al/Fe-dominated PSMs in P removal structures can be extended through feasible regeneration techniques demonstrated in this study, for both high and low P concentration scenarios. View Full-Text
Keywords: phosphorus; phosphorus removal structures; phosphorus sorption materials; regeneration phosphorus; phosphorus removal structures; phosphorus sorption materials; regeneration
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MDPI and ACS Style

S. P. C. Scott, I.; J. Penn, C.; Huang, C.-h. Development of a Regeneration Technique for Aluminum-Rich and Iron-Rich Phosphorus Sorption Materials. Water 2020, 12, 1784. https://doi.org/10.3390/w12061784

AMA Style

S. P. C. Scott I, J. Penn C, Huang C-h. Development of a Regeneration Technique for Aluminum-Rich and Iron-Rich Phosphorus Sorption Materials. Water. 2020; 12(6):1784. https://doi.org/10.3390/w12061784

Chicago/Turabian Style

S. P. C. Scott, Isis, Chad J. Penn, and Chi-hua Huang. 2020. "Development of a Regeneration Technique for Aluminum-Rich and Iron-Rich Phosphorus Sorption Materials" Water 12, no. 6: 1784. https://doi.org/10.3390/w12061784

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