title: Reclamation of copper-contaminated soil using EDTA or citric acid coupled with dissolved organic matter solution extracted from distillery sludge.
abstract: Soil washing using a strong chelating agent is a common practice for restoring contaminated soils, but significant soil fertility degradation and high operation costs are the major disadvantages. Washing soil with a dissolved organic matter (DOM) solution has been identified as a method that can moderate the loss of nutrients in the soil and enhance metal removal. The DOM solutions were extracted from waste sludge obtained from a local whisky distillery. Single chelating washing and chelate-DOM washing were carried out using ethylenediaminetetraacetic acid (EDTA), citric acid, and DOM solutions to remediate highly Cu-contaminated soil. Two-phase washing using 0.34 M citric acid and then 1500 mg L(-1) DOM solution (pH 8.5) was found to be most favorable for the soil. With this treatment, 91% Cu was removed from the topsoil; the organic matter, cation exchange capacity, plant-available nitrogen, and available phosphate content increased by 28.1%, 103%, 17.7%, and 422%, respectively.
authors.affiliation: Department of Environmental Engineering, National Ilan University, Ilan 260, Taiwan, ROC. ccliu@niu.edu.tw
authors.forename: Cheng-Chung
authors.initials: CC
authors.lastname: Liu
authors.forename: Ying-Chen
authors.initials: YC
authors.lastname: Lin
mesh_terms: D000327:Adsorption; D019343:Citric Acid / Q000737:chemistry*; D003300:Copper / Q000032:analysis / Q000737:chemistry*; D004492:Edetic Acid / Q000737:chemistry*; D052918:Environmental Restoration and Remediation / Q000379:methods*; D012987:Soil / Q000737:chemistry; D012989:Soil Pollutants / Q000032:analysis / Q000737:chemistry*; D014865:Waste Disposal, Fluid / Q000379:methods
chemical_list: D012987:Soil; D012989:Soil Pollutants; D019343:Citric Acid; D003300:Copper; D004492:Edetic Acid