Australian Cadmium Minimisation Strategy
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Workshop Resolutions

A workshop was held in Melbourne recently between state regulators, researchers and the water industry to examine the issue of cadmium additions to soils in organic fertilisers and recycled wastes e.g. biosolids.

Agreement was reached on the following actions:

  • Controls at source (i.e. trade waste policies) to be reviewed. Traceback of Cd in biosolids in treatment works with high Cd concentrations to determine where additional controls are needed on influent concentrations;
  • Maximum annual loading rate of 30g/ha/yr averaged over 5 years (150g/ha/5yr);
  • Maximum soil concentration 1.0 mg/kg, unless local data indicate lower limit;
  • Biosolid cadmium grading – national guideline to be adopted (when finalised);
  • Research to suggest soil/biosolid bioavailability index & what is a sustainability system;
  • An analytical quality assurance program be encouraged through the Australasian Soil and Plant Analysis Council; and
  • Controls on Cd in wastes other than biosolids to be considered e.g. other animal and urban wastes and composts.

US EPA issues final rule on maximum permissible contaminants in zinc fertilisers

"The US EPA has issued their final regulation on recycling of zinc wastes as fertilisers, and has set maximum cadmium, and other contaminant, concentrations in zinc fertilisers. The maximum permitted concentration for cadmium is 1.4 mg/kg per percentage zinc content. For further information see http://www.epa.gov/epaoswer/hazwaste/recycle/fertiliz/index.htm"

 

7 May, 2010
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