- Thesis topic: Recovery Nickel from Wastewater combining Membrane Technologies and Electroplating

- Doi: https://doi.org/10.6840/cycu202000552

- Abstract: 

     Nickel can be released into the environment from broad alloy furnaces or from power plants and wastewater. The most severe harmful health effects of nickel exposure such as chronic bronchitis decreased lung function and cancer of the lung and nasal sinus cancer. On the other hand, nickels are an essential trace element for some animals and one of the important metal from industries because nickel increases an alloy's resistance to corrosion and its ability to withstand extreme conditions.
This study focuses on recovering Ni(II) from industrial wastewater effluents with Membrane Distillation, Supported Liquid Membrane, and Electroplating. Nickel recovery and wastewater reuse are thus highly expected from the point of view of environmental protection and resource conservation, and an effluent-free technology should be developed.
Membrane distillation used as pre-treatment to concentrate the wastewater contains nickel. In this study using Air Gap Membrane Distillation with operating conditions as follow temperature on feed 55˚ C, cooling temperature 20˚ C, air gap distance 0.9 mm, feed flow rate 2 L/min and cooling flow rate 4,2 L/min.
      In the second stage, the concentrated wastewater was tested with the supported liquid membrane (SLM) technology in a lab-scale environment. Solvent extraction is the main technique for separating and extracting individual metals or for obtaining their mixed solutions and compounds this method is providing the best parameter for the SLM process. Solvent extraction parameters such as extractant (D2EHPA, TBP, CYANEX272) diluent (Isopar-g and kerosene), pH 3-7, Organic/Aqueous Ratio (O/A Ratio) 1/1 – 1/20, Concentration of extractant 0,1 M-1 M, and all experiment run for 20 minutes at room temperature. The last stage is Electroplating to get the nickel deposits an even layer of nickel alloy on the surface of a solid substrate.

Keywords: nickel, air gap between the 2000s, the supported liquid, the electroplating