Sibrell,P.L. and Tucker,T.W.(2012): Fixed bed sorption of phosphorus from wastewater using iron oxide-based media derived from acid mine drainage. Water Air Soil Pollut., 223, 5105-5117.

『酸性鉱山排水に由来した鉄酸化物を基にした媒体を用いての汚水からのリンの固定層収着』


Abstract
 Phosphorus (P) releases to the environment have been implicated in the eutrophication of important water bodies worldwide. Current technology for the removal of P from wastewaters consists of treatment with aluminium (Al) or iron (Fe) salts, but is expensive. The neutralization of acid mine drainage (AMD) generates sludge rich in Fe and Al oxides that has hitherto been considered a waste product, but these sludges could serve as an economical adsorption media for the removal of P from wastewaters. Therefore, we have evaluated an AMD-derived media as a sorbent for P in fixed bed sorption systems. The homogeneous surface diffusion model (HSDM) was used to analyze fixed bed test data and to determine the value of related sorption parameters. The surface diffusion modulus Ed was found to be a useful predictor of sorption kinetics. Values of Ed<0.2 were associated with early breakthrough of P, while more desirable S-shaped breakthrough curves resulted when 0.2<Ed<0.5. Computer simulations of the fixed bed process with the HSDM confirmed that if Ed was known, the shape of the breakthrough curve could be calculated. The surface diffusion coefficient Ds was a critical factor in the calculation of Ed and could be estimated based on the sorption test conditions such as media characteristics, and influent flow rate and concentration. Optimal test results were obtained with a relatively small media particle size (average particle radius 0.028 cm) and resulted in 96% removal of P from the influent over 46 days of continuous operation. These results indicate that fixed bed sorption of P would be a feasible option for the utilization of AMD residues, thus helping to decrease AMD treatment costs while at the same time ameliorating the impacts of P contamination.

Keywords: Acid mine drainage sludge; Eutrophication; Phosphorus removal; Fixed bed sorption; Homogeneous surface diffusion model; Wastewater; Iron oxide sorption media』

Nomenclature
1. Introduction
2. Methods and materials
 2.1. Sorption media
 2.2. Sorption capacity
 2.3. Fixed bed testing
 2.4. Modeling of fixed bed results
3. Results and discussion
 3.1. Sorption capacity
 3.2. Fixed bed testing - Effect of flow interruption
 3.3. Fixed bed testing - Effect of influent flow rate and concentration
 3.4. Fixed bed testing - Effect of media particle size
 3.5. Fixed bed simulations
4. Summary and conclusions
Acknowledgments
References


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