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Τίτλος: Intraparticle phosphorus diffusion in a drinking water treatment residual at room temperature
Συγγραφείς: El-Shall, Hassan E. 
Harris, Willie G. 
O'Connor, George A. 
Obreza, Thomas A. 
Makris, Konstantinos C. 
Major Field of Science: Natural Sciences
Field Category: Earth and Related Environmental Sciences
Λέξεις-κλειδιά: Phosphorus;Intraparticle diffusion;Sorption capacity;Long-term immobilization
Ημερομηνία Έκδοσης: 15-Σεπ-2004
Πηγή: Journal of Colloid and Interface Science, 2004, Volume 277, Issue 2, Pages 417–423
Volume: 277
Issue: 2
Start page: 417
End page: 423
Περιοδικό: Journal of Colloid and Interface Science 
Περίληψη: Phosphorus (P) has been recognized as one of the major limiting nutrients that are responsible for eutrophication of surface waters, worldwide. Efforts have been concentrated on reducing P loads reaching water bodies, via surface runoff and/or leaching through a soil profile. Use of drinking water treatment residuals (WTRs) is an emerging cost-effective practice to reduce soluble P in poorly P-sorbing soils or systems high in P. Literature suggests that WTRs have huge P sorption capacities. We hypothesized that P sorption would be limited by diffusional constraints imposed by the WTR particles. Selected chemical and physical (specific surface area, particle size distribution) characteristics of an iron-based WTR were measured. Sorption P isotherms at room temperature were constructed, and sorption kinetics were monitored. An intraparticle diffusion model was utilized to fit the kinetic data. Results showed that the WTR dramatically reduced soluble P, showing nonequilibrium characteristics, even after 80 d of reaction. Specific surface area (SSA) measured with CO2 gas was significantly greater than the traditional BET–N2 value (28 versus 3.5 m2 g−1), suggesting that a large amount of internal surfaces might be present in the WTR. The intraparticle P diffusion model was modified to include the wide particle size distribution of the WTR. The intraparticle diffusion model fitted the data well (r2=0.83). We calculated a maximum apparent P diffusion coefficient value of 4×10−15 cm2 s−1, which agrees with published values for intraparticle diffusion in microporous sorbents. This work may be useful for predicting long-term sorption characteristics of WTRs, since WTRs have been suggested as potential long-term immobilizers of sorbed P in P-sensitive ecosystems.
URI: https://hdl.handle.net/20.500.14279/1219
ISSN: 219797
DOI: http://dx.doi.org/10.1016/j.jcis.2004.05.001
Rights: © Elsevier Inc
Type: Article
Affiliation: University of Florida 
Publication Type: Peer Reviewed
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