Biosolids produced from wastewater treatment are rich in plant
nutrients and have gained acceptance as a valuable resource for use
as a soil amendment in agriculture, landscaping and mine site
rehabilitation (Brisolara and Qi, 2013; Kim and Owens, 2010;
McLaughlin et al., 2007). The concentrations of heavy metal contaminants
in biosolids can exceed regulatory thresholds precluding
re-use of the material for land application (EPA Victoria, 2004).