Παρακαλώ χρησιμοποιήστε αυτό το αναγνωριστικό για να παραπέμψετε ή να δημιουργήσετε σύνδεσμο προς αυτό το τεκμήριο:
https://hdl.handle.net/20.500.14279/1200
Τίτλος: | Physicochemical properties related to long-term phosphorus retention by drinking-water treatment residuals | Συγγραφείς: | Harris, Willie G. O'Connor, George A. Obreza, Thomas A. Elliott, Herschel A. Makris, Konstantinos C. |
Major Field of Science: | Natural Sciences | Field Category: | Earth and Related Environmental Sciences | Λέξεις-κλειδιά: | Drinking-water treatment residuals (WTR);Nonhazardous materials;Phosphorus sorption;Specific surface area (SSA) | Ημερομηνία Έκδοσης: | 1-Ιου-2005 | Πηγή: | Environmental Science & Technology, 2005, Volume 39, Issue 11, Pages 4280-4289 | Volume: | 39 | Issue: | 11 | Start page: | 4280 | End page: | 4289 | Περιοδικό: | Environmental Science & Technology | Περίληψη: | Drinking-water treatment residuals (WTRs) are nonhazardous materials that can be obtained free-of-charge from drinking-water treatment plants to reduce soluble phosphorus (P) concentrations in poorly P sorbing soils. Phosphorus sorption capacities of WTRs can vary 1-2 orders of magnitude, on the basis of short-term equilibration times (up to 7 d), but studies dealing with long-term (weeks to months) P retention by WTRs are lacking. Properties that most affect long-term P sorption capacities are pertinent to the efficacy of WTRs as amendments to stabilize P in soils. This research addressed the long-term (up to 80 d) P sorption/desorption characteristics and kinetics for seven WTRs, including the influence of specific surface area (SSA), porosity, and total C content on the overall magnitude of P sorption by seven WTRs. The data confirm a strong but variable affinity for P by WTRs. Aluminum-based WTRs tended to have higher P sorption capacity than Fe-based WTRs. Phosphorus sorption with time was biphasic in nature for most samples and best fit to a second-order rate model. The P sorption rate dependency was strongly correlated with a hysteretic P desorption, consistent with kinetic limitations on P desorption from micropores. Oxalate-extractable Al + Fe concentrations of the WTRs did not effectively explain long-term (80 d) P sorption capacities of the WTRs. Micropore (CO 2-based) SSAs were greater than BET-N2 SSAs for most WTRs, except those with the lowest (<80 g kg-1) total C content. There was a significant negative linear correlation between the total C content and the CO2/N2 SSA ratio. The data suggest that C in WTRs increases microporosity, but reduces P sorption per unit pore volume or surface area. Hence, variability in C content confounds direct relations among SSA, porosity, and P sorption. Total C, N2-based SSA, and CO 2-based SSAs explained 82% of the variability in the long-term P sorption capacities of the WTRs. Prediction of long-term P sorption capacities for different WTRs may be achieved by taking into account the three proposed variables. | URI: | https://hdl.handle.net/20.500.14279/1200 | ISSN: | 15205851 | DOI: | 10.1021/es0480769 | Rights: | © American Chemical Society | Type: | Article | Affiliation: | University of Texas University of Florida Pennsylvania State University |
Publication Type: | Peer Reviewed |
Εμφανίζεται στις συλλογές: | Άρθρα/Articles |
CORE Recommender
SCOPUSTM
Citations
129
checked on 9 Νοε 2023
WEB OF SCIENCETM
Citations
118
Last Week
0
0
Last month
0
0
checked on 29 Οκτ 2023
Page view(s)
545
Last Week
2
2
Last month
30
30
checked on 13 Μαρ 2025
Google ScholarTM
Check
Altmetric
Όλα τα τεκμήρια του δικτυακού τόπου προστατεύονται από πνευματικά δικαιώματα