This book gives a comprehensive discussion on the removal of heavy metal ions from electroplating wastewater sludge using acid dissolution. Hydrochloric acid, nitric acid and aqua regia solutions were used to dissolve the metals at various reaction conditions. Metals that were tested include Silver, Aluminium, Copper, Tin, Iron, Nickel and Zinc. The optimal recovery values obtained for the above metals were 99.5%, 72.6%, 99.6%, 55.4%, 19.4%, 4.97% and 6.4% respectively. The dissolution process was greatly influenced by the reagent type and reaction temperature. Results obtained were optimised...