A New Electroplating Wastewater Treatment Process Using Electric Lime and Vacuum Filtration

Document Type

Conference Proceeding

Publication Date



Department of Materials Science and Engineering


This study explores a new electroplating wastewater treatment process which could be cheaper and more efficient than the conventional approaches. The process consists of 3 steps: (1) electric lime is added to the electroplating wastewater to adjust the pH to around 9; (2) activated carbon is added to the turbid liquid; and (3) vacuum filter is used to replace traditional sedimentation tank for solid–liquid separation. Electric lime is used to replace liquid alkali for pH adjustment, which can greatly reduce production cost. Compared with the traditional sedimentation tank, the vacuum filter occupies less space, has lower operating cost and higher filtration speed, which greatly improves the production efficiency. The effluent of treated electroplating wastewater using the new process has the COD content reduced by about 60%, and the total oil content reduced by about 80%. This is obviously better than the traditional treatment process.

Publication Title

Minerals, Metals and Materials Series