University Of Tehran Press Pollution 2383-451X 5 1 2019 01 01 Efficiency of Washing Techniques for Removal of Heavy Metals from Industrial Sludge 189 198 68944 10.22059/poll.2018.264574.507 EN Sumalatha J. Department of Civil Engineering, Ramaiah Institute of Technology, Bangalore-560054, India Naveen B. P. Department of Civil Engineering, Amity School of Engineering and Technology Amity University Gurgaon, Haryana-122413, India. 0000-0002-7085-4912 Malik R. K. Department of Civil Engineering, Amity School of Engineering and Technology Amity University Gurgaon, Haryana-122413, India. Journal Article 2018 08 28 The effluent treatment plant sludge is one of the major sources of contamination with toxic metals. Since the sludge contains heavy metals, it must be pretreated to reduce the contamination. The heavy metals from the sludge can be reduced/ separated by washing it with a suitable leaching solution. In the present study, the efficiencies of three leaching solutions to remove the contaminants from an industrial sludge were studied and the leaching process was modeled. The leaching solutions used are 0.1 N HCl, 0.1 N EDTA and 0.1 N FeCl₃. The efficiencies of leaching solutions were assessed by conducting column leaching experiments on the sludge and the migration rates of heavy metal ions of Cu, Zn, Ni, Cd, Pb, Fe and Cr present in the sludge were estimated. These migration rates are useful to estimate the quantity of leaching solution required at the site to achieve the required levels of concentrations in the sludge. https://jpoll.ut.ac.ir/article_68944_479191c55d3a62ffc278ac81832f16a4.pdf