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

Journal Article · · Journal of Water Process Engineering

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-, CO32- and SO42-. 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.

Research Organization:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC04-94AL85000; NA0003525
OSTI ID:
1411608
Alternate ID(s):
OSTI ID: 1549069
Report Number(s):
SAND-2017-7226J; PII: S2214714417305093
Journal Information:
Journal of Water Process Engineering, Vol. 20, Issue C; ISSN 2214-7144
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 11 works
Citation information provided by
Web of Science

References (24)

Silica removal with sparingly soluble magnesium compounds. Part II journal July 2015
Hybrid electrolysis–crystallization system for silica removal from aqueous solutions journal April 2017
Geothermal produced fluids: Characteristics, treatment technologies, and management options journal October 2015
Optimization of silica removal with magnesium chloride in papermaking effluents: mechanistic and kinetic studies journal October 2015
Removal of silica from heavy oil wastewater to be reused in a boiler by combining magnesium and zinc compounds with coagulation journal October 2007
Chemistry of silica scale mitigation for RO desalination with particular reference to remote operations journal November 2014
Silica scale mitigation for high recovery reverse osmosis of groundwater for a mining process journal May 2014
Silica removal from newsprint mill effluents with aluminum salts journal August 2013
Silica removal in industrial effluents with high silica content and low hardness journal April 2014
Silica removal with sparingly soluble magnesium compounds. Part I journal December 2014
Evaluating electrocoagulation and chemical coagulation for removing dissolved silica from high efficiency reverse osmosis (HERO) concentrate solutions journal April 2017
Electrocoagulation for removal of silica nano-particles from chemical–mechanical-planarization wastewater journal March 2005
Silica removal to prevent silica scaling in reverse osmosis membranes journal July 2014
Silica removal using ion-exchange resins journal August 2004
Removal of dissolved silica from industrial waters using inorganic ion exchangers journal June 2017
Desalination of Brackish Waters Using Ion-Exchange Media journal May 2006
Synthesis, Characterization, and Ion Exchange Properties of Hydrotalcite Mg6Al2(OH)16(A)x(A‘)2-x·4H2O (A, A‘ = Cl-, Br-, I-, and NO3-, 2 ≥x≥ 0) Derivatives journal September 2003
Removal of phosphate by aluminum oxide hydroxide journal January 2003
Equilibrium and kinetic studies of adsorption of silica onto activated alumina journal February 2007
Surface modification of alumina nanoparticles with silane coupling agents journal January 2010
Chromium(VI) Removal from Aqueous Solutions by Mg−Al−CO 3 Hydrotalcite:  Sorption−Desorption Kinetic and Equilibrium Studies journal April 2004
Heavy metals removal by adsorption onto peanut husks carbon: characterization, kinetic study and modeling journal September 2001
Freundlich adsorption isotherms of agricultural by-product-based powdered activated carbons in a geosmin–water system journal November 2002
Thermodynamics of chromium(III) adsorption onto a cation exchanger derived from saw dust of Jack wood journal November 2009

Cited By (2)

Fabrication of hydrotalcite containing N/P/S and its ternary synergistic efficiency on thermostability and fire resistance of ethylene vinyl acetate (EVA) journal November 2018
Interaction of Pristine Hydrocalumite-Like Layered Double Hydroxides with Carbon Dioxide journal February 2019