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Electrochemical removal of sulfide ions and recovery of sulfur from sulfide ions containing wastes
E.G. Saad,T.M. Zewail,A.A. Zatout,E-S.Z. El-Ashtoukhy,M.H. Abdel-Aziz 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.94 No.-
In this work a two-compartment galvanic cell with two graphite rod electrodes and two types of cationexchange membranes: namely the Nafion membrane and synthetic fabric membrane is tested in treatingsulfide containing wastes and recovery of elemental sulfur. The cell reactions are sulfide oxidation at theanode and chromium (VI) reduction at the cathode. The effect of different parameters such as externalresistance, initial concentration of K2Cr2O7 solution, H2SO4 concentration, and initial concentration ofNa2S, the pH of the solution, NaCl concentration, and temperature of the solution is investigated. The cellperformance as a reactor and as an energy converter is expressed in terms of % sulfide removal andcurrent-voltage plots, respectively. Depending on the effects of the aforementioned factors, the optimalconditions that give the highest performance were determined, and then the cell was tested on realwastes from refinery processing at those conditions. The cell showed high selectivity in sulfide removaland sulfur recovery with almost no interference with other contaminants.
M.S. Ahmed,T.M. Zewail,E-S.Z. El-Ashtoukhy,H.A. Farag,I.H. El Azab,F.A. Albatati,A.F. Al-Hossainy,M.Sh. Zoromba,M.H. Abdel-Aziz 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.97 No.-
The goal of the present research is to study the impact of a stationary wiper almost touching a revolvingzinc solid cylinder on the rate of Cu+2 cementation. Initial Cu+2 ions concentration, speed of rotation, andthe effect of the presence and absence of a wiper were investigated. The degree of Cu+2 cementation wasstated in relation to the mass transfer coefficient which was valued under diverse circumstances. Thepresent study showed that the mass transfer coefficient accelerates as rotation speed and quantity of Cu+2increase. The presence of a wiper enhances the degree of Cu+2 cementation by an extent that varies from1.59 to 64% subject to the operational circumstances. The present mass transfer data have beeninterrelated by dimensionless equations. The importance of such relationships in the sizing and runningof rotating cylinders used for performing diffusion- restricted reactions is underlined.
M.H. Abdel-Aziz,E-S.Z. El-Ashtoukhy,M.Sh. Zoromba,M. Bassyouni,G.H. Sedahmed 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.82 No.-
In this work, removal of nitrates by electrocoagulation in a batch electrochemical cell with horizontallyoriented electrodes was studied, the anode was a horizontal Al serpentine tube whose inner surface canpotentially act as a built-in cooler to control the cell temperature, a H2 evolving Al plate cathode wasplaced beneath the anode at the cell bottom where the stirring action of H2 bubbles improve the mixingconditions at the anode. The effect of operating parameters, such as initial NO3 concentration, initial pHof the solution, applied current density, and NaCl concentration on the removal efficiency wasinvestigated. The electrical energy consumption of the cell was calculated at different operatingparameters in order to optimize the operating conditions. The removal efficiency of the cell reached 100%after 100 min. A kinetic model for the process was proposed and verified by the experimental data. Themerits of the present new cell which is self-stirred and contains a built-in heat transfer facility fortemperature control were highlighted. Importance of the present work for agriculture drainage waterand underground water remediation was pointed out.