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Published online 11 May 2005
Published in J Environ Qual 34:1112-1118 (2005)
DOI: 10.2134/jeq2004.0230
© 2005 American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America
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A Method for Determining the Phosphorus Sorption Capacity and Amorphous Aluminum of Aluminum-Based Drinking Water Treatment Residuals

E. A. Dayton* and N. T. Basta

School of Natural Resources, The Ohio State University, Columbus, OH 43210



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  		Fig. 1. Soluble P in two water treatment residuals (WTRs) spiked with KH2PO4 solutions and incubated up to 42 d. Initial Langmuir phosphorus adsorption maximum (Pmax) values were obtained using batch equilibration of WTR (<2 mm) with standard P solutions ranging from 0 to 100 mg P L–1 for 17 h.

 


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  		Fig. 2. Relationship between initial Langmuir phosphorus adsorption maximum (initial Pmax, <2 mm, and 17-h equilibration) and acid ammonium oxalate–extractable aluminum (Alox, 40:1 solution to water treatment residual [WTR] ratio) for 18 Al-based WTRs.

 


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  		Fig. 3. Relationship between oxalate-extractable Al (100:1 or 200:1 solution to water treatment residual [WTR] ratio) and oxalate-extractable Al (40:1 solution to WTR ratio) for 18 Al-based WTRs.

 


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  		Fig. 4. Solution phosphorus versus time for five Al-based water treatment residuals (WTRs) equilibrated for 19 d.

 


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  		Fig. 5. Phosphorus sorbed versus time for five Al-based water treatment residuals (WTRs) extracted periodically with 0.1 M KCl over 6 d.

 


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  		Fig. 6. Relationship between final Langmuir phosphorus adsorption maximum (final Pmax, <150 µm and 6 d equilibration) and (A) acid ammonium oxalate–extractable aluminum (Alox, 100:1 to solution to water treatment residual [WTR] ratio) and (B) acid ammonium oxalate–extractable aluminum + iron (Alox + Feox), 100:1 to solution to WTR ratio for 18 Al-based WTRs.

 




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