Recent history of sediment metal contamination in Lake Macquarie, Australia, and an assessment of ash handling procedure effectiveness in mitigating metal contamination from coal-fired power stations

Larissa Schneider*, William Maher, Jaimie Potts, Bernd Gruber, Graeme Batley, Anne Taylor, Anthony Chariton, Frank Krikowa, Atun Zawadzki, Henk Heijnis

*Corresponding author for this work

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

This study assessed historical changes in metal concentrations in sediments of southern Lake Macquarie resulting from the activities of coal-fired power stations, using a multi-proxy approach which combines 210Pb, 137Cs and metal concentrations in sediment cores. Metal concentrations in the lake were on average, Zn: 67mg/kg, Cu: 15mg/kg, As: 8mg/kg, Se: 2mg/kg, Cd: 1.5mg/kg, Pb: 8mg/kg with a maximum of Zn: 280 mg/kg, Cu: 80 mg/kg, As: 21 mg/kg, Se: 5 mg/kg, Cd: 4 mg/kg, Pb: 48 mg/kg. The ratios of measured concentrations in sediment cores to their sediment guidelines were Cd 1.8, As 1.0, Cu 0.5, Pb 0.2 and Zn 0.2, with the highest concern being for cadmium. Of special interest was assessment of the effects of changes in ash handling procedures by the Vales Point power station on the metal concentrations in the sediments. Comparing sediment layers before and after ash handling procedures were implemented, zinc concentrations have decreased 10%, arsenic 37%, selenium 20%, cadmium 38% and lead 14%. An analysis of contaminant depth profiles showed that, after implementation of new ash handling procedures in 1995, selenium and cadmium, the main contaminants in Australian black coal had decreased significantly in this estuary.

Original languageEnglish
Pages (from-to)659-670
Number of pages12
JournalScience of the Total Environment
Volume490
DOIs
Publication statusPublished - 15 Aug 2014
Externally publishedYes

Keywords

  • Ash dam
  • Coal
  • Power station
  • Sediment

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