Kinetics of Phosphate Adsorption by Calcium Carbonate and Ca‐Kaolinite

Kuo, Shyh Ming; Lotse, E. G.

doi:10.2136/sssaj1972.03615995003600050015x

Cited by 112 publications

(57 citation statements)

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“…Fast sorption accounts for 86% of the total mass loss and is thus the predominant sorption process. Similar results, with 80% of adsorption occurring within seconds, were reported for laboratory experiments with calcite (Kuo and Lotse, 1972;House and Donaldson, 1986). The calculated (P s-fast + P s-slow ):CaCO 3 ratios at any point along the plume where P retention is taking place vary between 1 × 10 − 4 and 2 × 10 − 3 , and thus also fall within the range observed in experiments (House and Donaldson, 1986;Millero et al, 2001).…”

Section: Doc O 2 and P Dynamics In Oxic Sewage Plumessupporting

confidence: 87%

Modelling the geochemical fate and transport of wastewater-derived phosphorus in contrasting groundwater systems

Spiteri

Slomp

Regnier

et al. 2007

Journal of Contaminant Hydrology

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A 1D reactive transport model (RTM) is used to obtain a mechanistic understanding of the fate of phosphorus (P) in the saturated zone of two contrasting aquifer systems. We use the field data from two oxic, electron donor-poor, wastewater-impacted, sandy Canadian aquifers, (Cambridge and Muskoka sites) as an example of a calcareous and non-calcareous groundwater system, respectively, to validate our reaction network. After approximately 10 years of wastewater infiltration, P is effectively attenuated within the first 10 m downgradient of the source mainly through fast sorption onto calcite and Fe oxides. Slow, kinetic sorption contributes further to P removal, while precipitation of phosphate minerals (strengite, hydroxyapatite) is quantitatively unimportant in the saturated zone. Nitrogen (N) dynamics are also considered, but nitrate behaves essentially as a conservative tracer in both systems. The model-predicted advancement of the P plume upon continued wastewater discharge at the calcareous site is in line with field observations. Model results suggest that, upon removal of the wastewater source, the P plume at both sites will persist for at least 20 years, owing to desorption of P from aquifer solids and the slow rate of P mineral precipitation. Sensitivity analyses for the noncalcareous scenario (Muskoka) illustrate the importance of the sorption capacity of the aquifer solids for P in modulating groundwater N:P ratios in oxic groundwater. The model simulations predict the breakthrough of groundwater with high P concentrations and low N:P ratios after 17 years at 20 m from the source for an aquifer with low sorption capacity (b 0.02% w/w Fe(OH) 3 ). In this type of system, denitrification plays a minor role in lowering the N:P ratios because it is limited by the availability of labile dissolved organic matter.

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Section: Doc O 2 and P Dynamics In Oxic Sewage Plumessupporting

confidence: 87%

Modelling the geochemical fate and transport of wastewater-derived phosphorus in contrasting groundwater systems

Spiteri

Slomp

Regnier

et al. 2007

Journal of Contaminant Hydrology

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“…Low cost materials including blast furnace slag (Johansson and Gustafsson, 2000), red mud (Baker et al, 1998), alum sludge (Galarneau and Gehr, 1997), natural soil (Stuanes, 1984), fly ash (Ugurlu and Salman, 1998), and limestone (Higgins et al, 1976;Kuo and Lotse, 1972) were tested as P removal agents in the wastewater treatment process. These materials efficiently removed P from wastewater, and major components in the materials for P removal were identified to be Al hydroxide, Fe oxide, calcium oxide, and calcium carbonate.…”

Section: Introductionmentioning

confidence: 99%

Removal capacity of water plant alum sludge for phosphorus in aqueous solutions

Kim

Moon

et al. 2002

Chemical Speciation & Bioavailability

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“…2-6). This phenomenon could be due to the dissolution of microcrystalline apatite minerals or P-bearing carbonates (Kuo and Lotse 1972;House 1990). Our data indicate that PO 4 -P release by SPM of the Paraguay River occurs through apatite dissolution.…”

mentioning

confidence: 67%

Phosphorus availability in the Paraná floodplain lakes (Argentina): Influence of pH andphosphate buffering by fluvial sediments

Carignan

Vaithiyanathan

1999

Limnology & Oceanography

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The phosphate-buffering properties and P chemistry of suspended particulate matter (SPM) collected in three geologically contrasting rivers (Bermejo, Paraguay, and Upper Paraná) are compared in order to explain the abundance of dissolved PO 4 -P in the Paraná floodplain lakes. The rivers show distinctive P-buffering capacities related to the chemical composition of their SPM. At natural pH, the linear adsorption coefficient of PO 4 -P (K d ) ranges from 0.25 liter g Ϫ1 for the Paraguay River to 1.38 liter g Ϫ1 for the Upper Paraná River. Equilibrium PO 4 -P ranges from 0.17 mol liter Ϫ1 for the Upper Paraná River to 2.92 mol liter Ϫ1 for the Bermejo River. Short-term (60 h) desorbable PO 4 -P ranges from 0.23 mol g Ϫ1 for the Paraguay to 0.77 mol g Ϫ1 for the Upper Paraná. These values increase substantially with a small decrease in pH representative of conditions experienced by riverine SPM when it enters the floodplain environment. For the carbonate-bearing SPM of the Bermejo and Paraguay Rivers, a pH decrease of 1-1.5 units causes a 10-fold increase in equilibrium PO 4 -P and a 5-to 10-fold increase in desorbable PO 4 -P, and it is associated with the release of Ca. In the Upper Paraná, a similar decrease in pH has opposite effects that are consistent with a stronger complexation of PO 4 -P by hydrous iron oxides at low pH. Compared to the parent riverine SPM, floodplain lake sediments are depleted in Ca-bound P and enriched in Fe-bound P. Although Ca-bound P is often considered biologically unavailable, our observations suggest that in the Paraná floodplain lakes, most of the available P originates from the acid dissolution of Ca-bound P. Loading of fluvial sediments to the lakes and the acidic dissolution of Ca-bound P appear sufficient to explain the permanent excess of dissolved PO 4 -P in these waters.

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Kinetics of Phosphate Adsorption by Calcium Carbonate and Ca‐Kaolinite

Cited by 112 publications

References 0 publications

Modelling the geochemical fate and transport of wastewater-derived phosphorus in contrasting groundwater systems

Modelling the geochemical fate and transport of wastewater-derived phosphorus in contrasting groundwater systems

Removal capacity of water plant alum sludge for phosphorus in aqueous solutions

Phosphorus availability in the Paraná floodplain lakes (Argentina): Influence of pH andphosphate buffering by fluvial sediments

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