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Precipitation recovery of boron from wastewater by hydrothermal mineralization

Authors
Journal
Water Research
0043-1354
Publisher
Elsevier
Publication Date
Volume
39
Issue
12
Identifiers
DOI: 10.1016/j.watres.2005.04.035
Keywords
  • Boron
  • Resource Recovery
  • Hydrothermal Mineralization
  • Calcium Borate
Disciplines
  • Earth Science
  • Geography

Abstract

Abstract It is well known that boric acid exhibits various toxic effects on plant, animal and human beings even at very low concentrations. Thus, the development of boron-removal technique from wastewater has been intensively investigated. In this study, a new hydrothermal treatment technique was developed to recover boron as recyclable precipitate Ca 2B 2O 5·H 2O from aqueous solutions. As a result, it was found that the hydrothermal treatment using calcium hydroxide as a mineralizer converted boron in the aqueous media effectively into calcium borate, Ca 2B 2O 5·H 2O. In the optimal hydrothermal condition, more than 99% of boron was collected from the synthetic wastewater of 500 ppm. Thus, the present hydrothermal treatment in the presence of calcium hydroxide is recommended as one of the effective techniques to recover boron from aqueous media.

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