Study of nickel removal from an electroplating unit wastewater by soda and characterization of the precipitate
2018
jerroumi, sarah | Lakhouiri, Abdelkebir | Lekhlif, Brahim | Lakhdar, Mahjoub | Afrine, Lehsen | Azzi, Mohamed | Nsakou, Sténelvie Ngala
Heavy metals are present in liquid effluents due to different industrial activities. Their presence in high concentrations constitutes an embarrassment for receiving environments, and strongly impacts water resources which, in a context of scarcity and climate change that exacerbates it, must be protected and safeguarded. This has prompted the implementation of numerous remedial measures, such as reducing the quantities of raw materials used, and curatives measures in order to reduce the nuisance. The object of this work is the removal of nickel from the effluent of an electroplating unit by precipitation with sodium hydroxide. The expected aim is firstly to minimize metallic pollution in order to discharge treated waste to meet the standards for indirect discharges into the municipal sewerage network or to reuse them in the industrial unit for other needs such as washing the workshops, washing the aerosol-filled air in the varnishing workshop, etc., and on the other hand, adding value to the precipitate in other industrial sectors. The tests were carried out in a batch reactor on industrial effluent solutions. They gave a nickel removal efficiency about 100%. The sludge resulting from the precipitation has been characterized by X-ray diffractometry. It consist essentially of nickel hydroxide II, in the form of β-Ni(OH)2 structure.
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