Investigation of Heavy Metals Leaching from Industrial Wastewater Sludge

Abstract

galvanic sewage sludge from electroplating plant was examined for leaching of heavy metals using various extracting solutions. The investigated parameters that influence heavy metals leaching were: con - tact time, type and concentration of leaching agents and form of sludge. The results of investigations show that the amounts of heavy metals (copper, nickel, chromium) released from industrial sludge using various leaching agents were from 0.07% to ~99% of their total contents. The form of sludge (air - dry or mineral residue) has a significant influence on quantities of metals leached.