Organic and Inorganic Phosphorus Sorption to Acid Mine Drainage Treatment Residuals.

Confined poultry production results in large quantities of phosphorus (P) containing manure. The repeated application of manure to soils based on the nitrogen content of this material resulted in soil P buildup; a process that has been linked to eutrophication of surface waters. Active treatment of acid mine drainage produces an iron-based waste product, acid mine drainage treatment residuals (AMD-TR).  Iron oxides are known to bind P. The adsorption capacity of six AMD-TRs was determined using inorganic P and the water soluble P from two poultry litter samples. Inorganic P was determined by colorimetry, total P by ICP and organic P by the difference. The potential for AMD-TRs to adsorb P from animal manures could convert what is now a liability (AMD-TR disposal) into an opportunity (P-management technology).