| Title |
Natural reusable calcium-rich adsorbent for the removal of phosphorus from water: proof of concept of a circular economy |
| ID_Doc |
21996 |
| Authors |
Lamont, K; Pensini, E; Daguppati, P; Rudra, R; van de Vegte, J; Levangie, J |
| Title |
Natural reusable calcium-rich adsorbent for the removal of phosphorus from water: proof of concept of a circular economy |
| Year |
2019 |
| Published |
Canadian Journal Of Civil Engineering, 46.0, 5 |
| DOI |
10.1139/cjce-2018-0512 |
| Abstract |
A calcium-rich rock (limestone) was used as adsorbent to remove phosphorus from water. Phosphorus could be subsequently desorbed from limestone at pH = 4, and potentially reused as fertilizer following pH neutralization. Sorption of phosphorus onto limestone was not affected by 100 mM KCl or by the nitrogen present in a commercial fertilizer, but it was hindered by 100 mM NaCl, urea and river water. The phosphorus removed was however never below similar to 9 mg P/kg rock, and it increased with increasing phosphorus concentrations in water. Phosphorus removal increased with 100 mM CaCl2 at neutral pH, likely due to its precipitation. Mixing for 30 s enhanced phosphorus sorption. Desorption of phosphorus from limestone following sorption in deionized water was similar to 50%, similar to 22%, and similar to 11% at pH = 4, pH = 7, and pH = 11, respectively. Phosphorus desorption was lower when sorption had occurred in river water than in deionized water or in 100 mM urea. |
| Author Keywords |
phosphorus; agricultural; sorbent; calcium; rock; limestone |
| Index Keywords |
Index Keywords |
| Document Type |
Other |
| Open Access |
Open Access |
| Source |
Science Citation Index Expanded (SCI-EXPANDED) |
| EID |
WOS:000466874200012 |
| WoS Category |
Engineering, Civil |
| Research Area |
Engineering |
| PDF |
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