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Phosphorus removal with by-products in a flow-through setting.
Dustin Stoner1, Chad Penn, Joshua McGrath
1Oklahoma State Univ., Dep. of Plant and Soil Sci., Stillwater 47078-1020, USA.
Journal of Environmental Quality
|May 9, 2012
Summary
Industrial by-products can reduce phosphorus pollution in waterways. Key chemical properties like aluminum, iron, and calcium content significantly impact their effectiveness in flow-through filters, outperforming simple batch tests.
Area of Science:
- Environmental Science
- Water Quality Management
- Soil Science
Background:
- Phosphorus (P) runoff causes eutrophication in surface waters.
- Industrial by-products show potential for P removal in landscape filters.
- Limited data exists on P sorption by these materials in flow-through systems.
Purpose of the Study:
- Evaluate industrial by-products for P sorption in flow-through conditions.
- Identify material properties influencing P removal in flow-through settings.
- Assess the effects of retention time (RT) and P concentration on P removal.
Main Methods:
- Characterized twelve industrial by-products for P-influencing chemical properties.
- Conducted flow-through P sorption experiments with varying RTs and P concentrations.
- Analyzed the correlation between material properties, RT, P concentration, and P removal.
Main Results:
- P removal varied with material properties, primarily oxalate-extractable aluminum (Al), iron (Fe), and water-soluble (WS) calcium (Ca).
- Materials rich in Al, Fe, WS Ca, and buffered above pH 6 showed highest P removal.
- Batch isotherm Langmuir sorption maximum values poorly correlated with and overestimated flow-through P removal.
- Increased RT and P concentration enhanced removal for precipitation-driven sorption, but not for ligand exchange.
Conclusions:
- Material chemical composition is critical for effective flow-through P removal.
- Flow-through conditions and material properties dictate P removal efficiency.
- Batch isotherm data may not accurately predict performance in landscape P filters.
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