Modification of the process of heavy metals immobilization in wastewater sludge

This paper presents the results of laboratory research on the process of heavy metals extraction from sludge, where heavy metals content exceeds permissible levels. The method of immobilization of heavy metals depends on using the developed technology hygienization process of wastewater sludge (which is pending by patent) to environment utilization. The base of this technology is treatment of municipal wastewater sludge by dust from electrofilters of cement mills with the addition of roasted raw detrital basalt. The modification of this technology involves using the additional unit operation that is followed by extraction of the excessive amount of heavy metals from sludge. The results of heavy metals extraction from wastewater sludge were presented.