Abstract

Filter treatment may be a viable means for removing the nitrate (NO₃⁻), phosphate (PO₄³⁻), and pesticides discharged with agricultural drainage waters that cause adverse environmental impacts within the U.S. on local, regional, and national scales. Laboratory batch test screening for agricultural drainage water treatment potential was conducted on 58 industrial product/byproduct filter materials grouped into six categories: (1) high carbon content media; (2) high iron content media; (3) high aluminum content media; (4) surfactant modified clay/zeolite; (5) coal combustion residuals; and (6) spent foundry sands. Based on a percent contaminant removal criteria of 75% or greater, seven industrial products/byproducts were found to meet this standard for NO₃⁻ alone, 44 met this standard for PO₄³⁻, and 25 met this standard for the chlorinated triazine herbicide, atrazine. Using a 50% or greater contaminant removal criteria, five of the industrial product/byproduct filter materials exhibited potential for removing NO₃⁻, PO₄³⁻, and atrazine together; eight showed capability for combined NO₃⁻ and PO₄³⁻ removal; 21 showed capability for combined PO₄³⁻ and atrazine removal; and nine showed capability for combined NO₃⁻ and atrazine removal. The results of this study delineated some potential industrial product/byproduct filter materials for drainage water treatment; however, a complete feasibility evaluation for drainage water treatment of any of these filter materials will require much more extensive testing. View Full-Text