The aim of the presented study was to examine physical and chemical characteristics of sewage sludge from the central wastewater treatment plant (CWWTP) in Kranj and examine the final sewage sludge disposal. Heavy metals are one of the main pollutantsthat are present in the sewage sludge. Their concentration is very important for the final sewage sludge disposal.
In the first part,the study presents the Slovenian legislation of sewage sludge.It outlines the possibilities of the final sludge disposal and decribes the main main characteristic of heavy metals.
During experimental work have been monitoring metals in sewage sludge from 2007 to 2013 of the CWWTP Kranj, and we tested composting sewage sludge with wood material.Based on experimental results has been examined possibilities of final sewage sludge disposal fromCWWTP Kranj and optimal solution has been proposed.
The results showed that the sewage sludge from the CWWTP Kranj containedhigh concentrations of heavy metals,and was thus unusable on agricultural and non-agricultural area. We considered that the optimal solution of the final sewage sludge disposal from CWWTP Kranj would be composting the sludge with some other material. Such material could be used for remediation of landfills and other degraded area.