Abstract

The analysis of bottom sediments in terms of their fertilizing properties. In paper the characterize of sediments as product to nature usage was done. Analyzed material was taken from ecological treatment system located in wastewater treatment plant in Swarzewo (Pomerania Region) about flow Q= 6000 m3/d. Measurements of dry matter and organic matter content, as well as nitrogen concentrations and phosphorus fractions: loosely bound on surface of sediments particles (NH4Cl-P), bound with iron compounds (Fe-P), bound with aluminum and organic matter (NaOH-P), bound with magnesium and calcium (HCl-P) and in insoluble compounds with mineral and organic character (Res.-P). Also the concentration of six heavy metals (Zn, Cu, Pb, Ni, Cr, Cd) along the profile of sediments were determined. On the basis of obtained results in sediments it was found the high concentration of nitrogen (from 3,0 to 4,23 % d.m.). Moreover the sediments are the rich source of phosphorus directly assimilable by plants. The part of bioavailable form (sum of NH4Cl-P, Fe-P, NaOH-P fractions) was about 80.0% of total phosphorus. It was proved that average concentrations of analyzed metals in sediments were below permissible values described by Polish law for agricultural usage. Problem in agricultural usage poses high moisture and presence of pathogens - pathogenic bacteria, protozoa, fungus and parasites.Keywords: Ecological Treatment Systems (ETS), sediments, fractions of phosphorus, nutrients, heavy metals.

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