Removal of nickel through sulfide precipitation and characterization of electroplating wastewater sludge

Author:

Jerroumi Sarah12,Amarine Mohammed23,Nour Hassan1,Lekhlif Brahim2,Jamal Jamal Eddine1

Affiliation:

1. Department of Chemistry, Faculty of Sciences Ain Chock, Hassan II University, B.P 5366, Casablanca, Morocco

2. Department of Water Treatment and Climate Change, Hassania School of Public Works, Hassan II University, B.P 5366, Casablanca, Morocco

3. Laboratory of Water Chemistry, Pasteur Institute of Morocco, 1, Place Louis Pasteur, Casablanca, 20360, Morocco

Abstract

Abstract This work consists of the removal of nickel by sulfide precipitation from industrial electroplating wastewater and characterization of the produced sludge. Tests are carried out in a perfectly stirred batch reactor on electroplating industrial solution and synthetic solution prepared in the laboratory. The aim is to evaluate the impact of complexing agents formed during precipitation of metal ions in the industrial effluent. The concentration of nickel in both solutions is 100 mg/L. The operating conditions for the sulfide precipitation process are optimized: pH, molar ratio [S=]/[Ni2+] and dosage of S= ions. For an initial pH of 5 and an equimolar ratio of [S=]/[Ni2+]:1/1, the results show that the removal efficiency of Ni2+ ions is approaching 91 and 94% for industrial and synthetic solutions, respectively. Otherwise, for the same pH value in supersaturation conditions ([S=]/[Ni2+]:1.5/1), the removal efficiency is approaching 62 and 92% for industrial and synthetic solutions, respectively. For an effective metal removal, the optimal dosage of sulfide ions was evaluated. For 33 mg/L of S=, the removal efficiency of Ni2+ is approximately 90%. The resulting sludge has been characterized by X-ray diffractometry, scanning electron microscopy, infrared spectroscopy and thermal analysis. It consists essentially of millerite and nickel oxide.

Publisher

IWA Publishing

Subject

Water Science and Technology

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