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AuthorMohammad A.F.
AuthorEl-Naas M.H.
AuthorAl-Marzouqi A.H.
AuthorSuleiman M.I.
AuthorAl Musharfy M.
Available date2020-04-15T12:01:41Z
Publication Date2019
Publication NameJournal of Water Process Engineering
AbstractIn this work, the recovery of magnesium from desalination reject brine through reaction with ammonia has been evaluated and statistically optimized using response surface methodology. The process is based on precipitation of magnesium hydroxide by the reaction of MgCO3 in the brine with ammonium hydroxide. A software, which is designed for studying chemical reaction and equilibrium, was employed to perform the thermodynamic analysis of the reaction of magnesium carbonate with ammonia, which was found to be exothermic and spontaneous in the temperature range of 0–22 °C. Central composite design (5-level, 3-factor) was used to optimize the process to obtain the maximum response of magnesium recovery as a function of reaction temperature, brine salinity, and ammonia to magnesium molar ratio. Maximum recovery of 99% was obtained at a temperature of 15 °C, brine salinity of 85 g/L, and a molar ratio of 4.4NH3: 1 Mg. The predicted response was in excellent agreement with the experimental results. The collected solid product at optimum conditions was characterized using X-ray Diffraction, Energy Dispersive Spectra analysis and thermogravimetric analysis. The analysis indicated the high purity of the recovered product in the form of Brucite (Mg(OH)2).
SponsorThe authors would like to acknowledge the financial support provided by Takreer Research Center . The authors would also like to thank Dr. Hussain Awad and Eng. Haliemeh Sweidan from The Chemical and Petroleum Engineering Department at the UAE University for their help.
PublisherElsevier Ltd
SubjectHigh salinity water
SubjectMagnesium hydroxide
SubjectReject brine management
TitleOptimization of magnesium recovery from reject brine for reuse in desalination post-treatment
Volume Number31

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