Abstract
The work presents the results of physico-chemical studies on municipal sewage sludge from water treatment plants in the Warmian-Masurian province during the years 2005-2009. Dry mass and organic matter content and pH were determined in the samples. Heavy metals (cadmium, chromium, copper, nickel, lead, zinc, and mercury) were assessed by means of flame atomic absorption spectroscopy (FAAS) following mineralization in a microwave system. Dry matter content in the analyzed sewage sludge ranged from 18.1 % to 27.9 %, with the organic matter content in dry mass between 57.2 % and 69.9 %. Large differences in the average content of heavy metals were noted between the individual study years. Differences under 100 % were characteristic of Ni, Pb, Zn and Hg, and above 100 % of Cu, Cr and Cd. The differences between the minimal and maximal content ranged from 38 % to 205 % in relation to the average values in the study years. Among the analyzed microelements, Zn and Cu (included in the group of microelements applied in agriculture) were most prevalent The remaining heavy metals occurred in amounts lower than those specified by the acceptable norms for application in agriculture.
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