Total removal of heavy metal from mixed plating rinse wastewater

• Main Authors: Sapari, Nasiman, Idris, Azni, Ab Hamid, Noor Hisham
• Format: Article
• Published: Elsevier 1996
• Subjects: TD Environmental technology. Sanitary engineering
• Online Access: http://eprints.utp.edu.my/5300/1/Total_removal_of_heavy_metal_from_mixed_plating_rinse_wastewater.pdf; http://www.sciencedirect.com/science; http://eprints.utp.edu.my/5300/

A mixed plating rinse wastewater containing zinc, hexavalent chromium, trivalent chromium, and cyanide with total dissolved solids of 424 mgil was treated by a model consisting of a sand filter and ion exchange columns. A strongly acidic cation resin in hydrogen form and a strongly basic anion resin in hydroxide form were used in the columns as cationic and anionic exchangers, respectively. The cationic and anionic exchangers were regenerated by using 2% H,SO, and 5% NaOH, respectively. A 100% removal of zinc, total chromium, hexavalent chromium and trivalent chromium was achieved in the studies. Very high removal of total dissolved solids, cyanide and hardness level was achieved at 98.9%, 99.9% and 96.5%, respectively. The conductivity of wastewater was reduced from an average of 358 psicm to 5 psicm. The case study has shown that treatment systems using cationic and anionic resin were able to treat a mixed plating bath effluent to comply with the standard discharge under the Malaysian Environmental Quality (Sewage and Industrial Effluents} Regulation, 1979.