Leaching characteristics of CCA-treated wood waste: a UK study

The Science of the Total Environment
T G Mercer, Lynne E Frostick

Abstract

CCA-treated wood is expected to increase in the UK waste stream over the next 20-50 years. The potential pollution from this waste has been evaluated through two leaching studies, one based upon batch leaching tests and another based upon a series of lysimeter tests. The aim of the studies was to characterise the behaviour of arsenic (As), chromium (Cr) and copper (Cu) from this wood when applied to soil as a mulch. Results demonstrate that all three elements leach from CCA waste wood, occasionally in concentrations exceeding regulatory thresholds by two to three orders of magnitude. In the lysimeter study, wood mulch monofills and wood mulch in combination with soil were used to monitor the leaching of As, Cr and Cu. Peak concentrations for As, Cr and Cu were 1885 μg/l, 1243 μg/l and 1261 μg/l, respectively. Freshly treated wood leached 11, 23 and 33 times more Cu, Cr and As, respectively than weathered wood. The toxic and mobile species of arsenic (As III, As V) were detected. Leaching in the CCA wood monofill was influenced by rainfall, with higher concentrations of metal(loid)s produced in lower intensity events. As and Cu were mobilised preferentially, with all metals exhibiting similar temporal trends. Retention of leache...Continue Reading

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May 16, 2014·Waste Management·Ana López, Amaya Lobo
Feb 10, 2016·Waste Management·Suzana Frighetto FerrariniMarçal Pires
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Jan 8, 2021·Environmental Geochemistry and Health·Erdal ÖbekMurat Topal

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