title: Leaching of chloride, sulphate, heavy metals, dissolved organic carbon and phenolic organic pesticides from contaminated concrete.
abstract: Concrete samples from demolition waste of a former pesticide plant in Sweden were analysed for total contents and leachate concentrations of potentially hazardous inorganic substances, TOC, phenols, as well as for pesticide compounds such as phenoxy acids, chlorophenols and chlorocresols. Leachates were produced by means of modified standard column leaching tests and pH-stat batch tests. Due to elevated contents of chromium and lead, as well as due to high chloride concentrations in the first leachate from column tests at L/S 0.1, recycling of the concrete as a construction material in groundworks is likely to be restricted according to Swedish guidelines. The studied pesticide compounds appear to be relatively mobile at the materials own pH>12, 12, 9 and 7. Potential leaching of pesticide residues from recycled concrete to ground water and surface water might exceed water quality guidelines for the remediation site and the EU Water Framework Directive. Results of this study stress the necessity to systematically study the mechanism behind mobility of organic contaminants from alkaline construction and demolition wastes rather than rely on total content limit values.
authors.affiliation: Sweco Environment, Drottningtorget 14, Box 286, 211 22 Malmö, Sweden; Centre for Environmental and Climate Research, Sölvegatan 3, 223 62 Lund, Lund University, Sweden. Electronic address: martijn.van_praagh@tvrl.lth.se.
authors.forename: M
authors.initials: M
authors.lastname: Van Praagh
authors.affiliation: Sweco Environment, Drottningtorget 14, Box 286, 211 22 Malmö, Sweden.
authors.forename: H
authors.initials: H
authors.lastname: Modin
mesh_terms: D003252:Construction Materials / Q000032:analysis*; D007220:Industrial Waste / Q000032:analysis*; D059027:Recycling / Q000592:standards; D013548:Sweden; D018505:Waste Management / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D007220:Industrial Waste; D014874:Water Pollutants, Chemical
keywords: C&D waste; Concrete; Leaching; Pesticides; Recycling; Solid waste