Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Phosphorus Fate and Transport in Soil Columns Loaded Intermittently with Influent of High Phosphorus Concentrations
In this study, several columns of different lengths were filled with composite soils sampled from the field at corresponding depths and then loaded intermittently with influent of a high phosphorus concentration to evaluate phosphorus fate and transport in soil. The results indicate that the height of the mass transfer zone, solvent pore velocity, and soil's life expectancy for phosphorus removal increased with depth, while the retained phosphorus per kilogram of soil and the linear adsorption equilibrium coefficient, R, decreased with depth. An equation was developed to link liquid‐phase phosphorus with solvent traveling time and soil depth. The results of X‐ray diffraction and washout tests indicate that calcium‐phosphorus precipitation and/or crystal growth occurred in the columns. The new protocol is useful for evaluation of phosphorus fate and transport in other subsurface systems, because it allows flexible adjustments in hydraulic loadings, feed solution, and sampling schemes.
Phosphorus Fate and Transport in Soil Columns Loaded Intermittently with Influent of High Phosphorus Concentrations
In this study, several columns of different lengths were filled with composite soils sampled from the field at corresponding depths and then loaded intermittently with influent of a high phosphorus concentration to evaluate phosphorus fate and transport in soil. The results indicate that the height of the mass transfer zone, solvent pore velocity, and soil's life expectancy for phosphorus removal increased with depth, while the retained phosphorus per kilogram of soil and the linear adsorption equilibrium coefficient, R, decreased with depth. An equation was developed to link liquid‐phase phosphorus with solvent traveling time and soil depth. The results of X‐ray diffraction and washout tests indicate that calcium‐phosphorus precipitation and/or crystal growth occurred in the columns. The new protocol is useful for evaluation of phosphorus fate and transport in other subsurface systems, because it allows flexible adjustments in hydraulic loadings, feed solution, and sampling schemes.
Phosphorus Fate and Transport in Soil Columns Loaded Intermittently with Influent of High Phosphorus Concentrations
Zhang, Tian C. (Autor:in) / Dahab, Mohamed F. (Autor:in) / Nunes, Germana S. (Autor:in) / Hu, Cong (Autor:in) / Surampalli, Rao (Autor:in)
Water Environment Research ; 79 ; 2343-2351
01.10.2007
9 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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