Exceptional selectivity for dissolved silicas in industrial waters using mixed oxides

Sasan, Koroush; Brady, Patrick V.; Krumhansl, James L.; Nenoff, Tina M.

doi:10.1016/j.jwpe.2017.11.003

Title: Exceptional selectivity for dissolved silicas in industrial waters using mixed oxides

Journal Article · Mon Nov 06 23:00:00 EST 2017 · Journal of Water Process Engineering

DOI: https://doi.org/10.1016/j.jwpe.2017.11.003 · OSTI ID:1411608

Sasan, Koroush ^[1]; Brady, Patrick V. ^[1]; Krumhansl, James L. ^[1]; Nenoff, Tina M. ^[1]

Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

The removal of silica, ubiquitous in produced and industrial waters, by novel mixed oxides is investigated in this present study. We have combined the advantage of high selectivity hydrotalcite (HTC, (Mg₆Al₂(OH)₁₆(CO₃)·4H₂O)), with large surface area of active alumina (AA, (Al₂O₃)) for effective removing of the dissolved silica from cooling tower water. The batch test results indicated the combined HTC/AA is a more effective method for removing silica from CTW than using each of HTC or AA separately. The silica uptake was confirmed by Fourier transform infrared (FTIR), and Energy dispersive spectroscopy (EDS). Our results indicate HTC/AA effectively removes silica from cooling tower water (CTW), even in the presence of large concentrations of competing anions, such as Cl^-, NO₃^- HCO₃^-, CO₃^2- and SO₄^2-. The Single Path Flow Through (SPFT) tests confirmed to rapid uptake of silica by combined HTC/AA during column filtration. The experimental data of silica adsorption fit best to Freundlich isotherm model.

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Research Organization:: Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC04-94AL85000; NA0003525

OSTI ID:: 1411608

Report Number(s):: SAND--2017-7226J; PII: S2214714417305093

Journal Information:: Journal of Water Process Engineering, Journal Name: Journal of Water Process Engineering Journal Issue: C Vol. 20; ISSN 2214-7144

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
active alumina
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