Summary: Agriculture having applied a strict standard on the composition of sewage sludges for fertilization, especially on noxious substances such as heavy metals, the sewage control in the sewerage systems is orientated towards the detection of the origin of heavy metals. For this purpose of investigation, the main polluters could be identified and located in two town8 from results of the sewer skin investigations in the sewerage systems. A detailed description is given of the arrangement of the measurement networks, the sewer skin sampling technique and the preparation of samples. With the aid of the atomic absorption spectroscopy there were investigated also sewage and digested-sludge samples for Cu, Cd, Cr, Ni, Pb, Zn. Two groups of sludges having similar composition could be found by means of cluster analysis.
Zielstellung
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