Electrocatalytic Oxidation of Aluminum Alloy Chemical Milling Wastewater Using Ti4O7/Ti Electrode
The cleaning water generated during the chemical milling of aluminum alloys exhibits high alkalinity and organic-rich compounds,posing challenges for conventional biochemical methods.Direct discharge may cause severe environmental harm.This study employs electrocatalytic oxidation to treat wastewater from chemical milling of aluminum alloy.Using a titanium suboxide coated electrode and stainless steel as the cathode,this study investigates the oxidation and degradation mechanisms of typical organic compounds in the chemical milling wastewater on the Ti4O7/Ti electrode surface.In addition,this study explores the effects of electrolysis process parameters such as initial pH,current density,stirring method,initial pollutant concentration,and treatment time on the CODCr removal rate of the wastewater.The results indicate that triethanolamine in the cleaning wastewater of the chemical milling of aluminum alloy cannot be directly oxidized on the Ti4O7/Ti electrode surface.Under optimized conditions,the CODCr of the treated aluminum alloy chemical milling wastewater decreases from the initial 5 210 mg·L-1 to 42 mg·L-1,meeting the environmental discharge standard of 300 mg·L-1.The optimal treatment conditions are:pH=7,5 mA·cm-2,and aeration stirring.Therefore,electrocatalytic oxidation with Ti4O7/Ti as the anode proves effective in treating wastewater from aluminum alloy chemical milling,bringing it into compliance with environmental discharge standards.
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