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Removal of boron and fluoride in wastewater using Mg-Al layered double hydroxide and Mg-Al oxide
Tomohito Kameda1, Jumpei Oba1, Toshiaki Yoshioka1
1Graduate School of Environmental Studies, Tohoku University, 6-6-07 Aoba, Aramaki, Aoba-ku, Sendai, 980-8579, Japan.
Abstract:
Mg-Al layered double hydroxide intercalated with NO3- and Mg-Al oxide were found to remove hazardous materials such as B and As, as well as Cl- and SO42-, from artificial and real hot spring wastewater. However, compared with the mixture of Al2(SO4)3 and Ca(OH)2, both adsorbents were inferior for the removal of B from real hot spring wastewater. Both adsorbents were also found to remove F- and PO43- from artificial semiconductor plant wastewater. Both adsorbents have the same ability to remove B from landfill wastewater as the mixture of Al2(SO4)3 and Ca(OH)2; furthermore, both remove Cl-, Br-, and SO42-. The benefit of Mg-Al layered double hydroxide intercalated with NO3- is that it does not require neutralization after the treatment. Overall, it can be stated that among the materials tested, Mg-Al layered double hydroxide intercalated with NO3- is the most suitable adsorbent for the treatment of hot spring and landfill wastewater.
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