Abstract:
Wastewater from printing - press industry contains high concentrations of copper chromium and nickel since these metals are major component in required chemicals used in the industrial. Aim of this research is to study a possibility for simultaneously remove of copper, chromium and nickel ions from the printing press wastewater using continuous flow electrochemistry method. Two - compartment electrochemical cell equipped with graphite electrodes was employed. The studies were devided into two parts. First, study the best flow rate of wastewater to remove of copper, chromium and nickel. Results indicate that metal removal occurred better at lower flow rate. The concentrations of copper, chromium and nickel were reduced until passed the Thailands industrial water quality standard within 60, 90 and 90 min, respectively, at the first sampling point of the electrochemical cell when using a fixed flow rate of 2.8 ml/min. Second, study the best current density for removal of copper, chromium and nickel. Results indicate that metal removal occurred faster at higher current density. The 99.84% copper, 99.85% chromium and 97.72% nickel were eliminated within 25 min, at the second sampling point of the electrochemical cell when 15.43 A/m² was applied.