Removal of Nickel, Zinc and Copper from Plating Process Industrial Raw Effluent Via Hydroxide Precipitation Versus Sulphide Precipitation

Joint Conference on Green Engineering Technology & Applied Computing 2019

工业技术（总论）;计算机科学

Ain Zainuddin, Nur^1 ; Azwan Raja Mamat, Tengku^1 ; Imam Maarof, Hawaiah^1 ; Wahidah Puasa, Siti^1 ; Rohana Mohd Yatim, Siti^2

Faculty of Chemical Engineering, Universiti Teknologi MARA (UiTM), Selangor, Shah Alam

40450, Malaysia^1

Department of Environmental Health, Faculty of Health Science, Universiti Teknologi MARA (UiTM), Shah Alam, Selangor

40450, Malaysia^2

关键词: Coagulant dosage;    Hydroxide precipitation;    Industrial wastewaters;    Jar test;    Mixed-metals;    Optimum pH;    Plating process;    Sulphide precipitation;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/551/1/012122/pdf
DOI  :  10.1088/1757-899X/551/1/012122

来源: IOP

【 摘 要 】

Electroless plating wastewater contains mixed metals element. Although precipitation is the most common method applied to remove metals from the wastewater, it fails to completely precipitate all the metals at a single pH. The present work evaluates the effectiveness of the sulphide and the hydroxide precipitation for removal of nickel, zinc and copper from industrial wastewater, namely acid rinse and nickel rinse samples. The optimum pH and coagulant dosage were determined via Jar Test for both types of samples. Sulphide precipitation removed heavy metals more efficient than hydroxide precipitation. For the acid rinse sample, 95.32% of nickel was removed using sulphide precipitation while 76.66% removal using hydroxide precipitation. For nickel rinse sample, 93.75% of zinc was removed using sulphide while 68.8% removal using hydroxide. 65.75% of nickel was removed using both sulphide and hydroxide. Total removal of copper was achieved for both hydroxide and sulphide precipitation, either from acid rinse or nickel rinse samples.