Statistics Norway

Municipal waste water treatment. Discharges, treatment efficiencies and sludge disposal

5   Content of heavy metals in sewage sludge. The whole country. 2002. Milligrams per kilograms dry weight
  Average content Maximum registered content Limit value for agricultural areas Limit value for parks etc. Change in average content 2001-2002
  Milligrams per kilograms dry weight Per cent
Cadmium (Cd) 0.8  117 2 5 -19.4
Chromium (Cr) 26.9  358  100  150 9.6
Copper (Cu)  219.5 1 500  650 1 000 -3.3
Mercury (Hg) 0.9 27 3 5 12.5
Nickel (Ni) 14.5  509 50 80 14.1
Lead (Pb) 19.1 2 060 80  200 16.7
Zinc (Zn)  320.7 4 175  800 1 500 5.9

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