Simultaneous Removal of Arsenic and Silica from Geothermal Water Using Hydrotalcite

Effects of HNO 3 and H 3 PO 4 on ion exchange of natural zeolite in a new-simple process, which is a twostep process using calcined hydrotalcite and natural zeolite, for making agricultural cultivation solution were examined. The anion-reduced solution obtained by the treatment of seawater with calcined hydrotalcite (CHT-solution) was neutralized with phosphoric (CHT-solution-H 3 PO 4) or nitric acids (CHT-solution-HNO 3), and each four solutions (seawater, CHT-solution, CHT-solution-H 3 PO 4 and CHT-solution-HNO 3) was treated with natural zeolite to compare the ion exchange behaviors among these solutions. The pH of the all solutions can be neutralized to 5.5 by zeolite treatment, and the Na + content can be removed from the all solution. The tendencies of Na + removal in all solutions are almost same, and percentages of Na + removal from all solutions are above 95% over 8 times zeolite treatment. The amounts of supplies for K + , Mg 2+ and Ca 2+ to the CHT-solution-HNO 3 is higher than those of other solutions up to 6 times treatment. While almost PO 4 3was removed, NO 3 was remained in the solution, over 6 times treatment with natural zeolite. Therefore, NO 3is possible to be supplied to the solution as nutrient in the two-step process, but PO 4 3isn't possible.

show abstract

“…Vol.20, No.1, (Apr. 2014) [7]. Calcined hydrotalcite was produced by heating the prepared hydrotalcite at 500℃ for 3 h in an electric furnace.…”

Section: Methodsmentioning

confidence: 99%

Effect of HNO3 and H3PO4 on Ion Exchange of Natural Zeolite for Making Agricultural Cultivation Solution from Seawater

Wajima

Simizu

Yamato

et al. 2014

Int.J.Soc.Mater.Eng.Resour.

Self Cite

View full text Add to dashboard Cite

show abstract

Removal of phosphite and sulfate from electroless nickel–phosphorus plating bath with hydrotalcite for the management of watershed

Kamimoto

Ichino

Kiso

et al. 2013

Desalination and Water Treatment

View full text Add to dashboard Cite

Simultaneous Removal of Arsenic and Silica from Geothermal Water Using Hydrotalcite

Cited by 2 publications

References 10 publications

Effect of HNO<sub>3</sub> and H<sub>3</sub>PO<sub>4</sub> on Ion Exchange of Natural Zeolite for Making Agricultural Cultivation Solution from Seawater

Effect of HNO<sub>3</sub> and H<sub>3</sub>PO<sub>4</sub> on Ion Exchange of Natural Zeolite for Making Agricultural Cultivation Solution from Seawater

Removal of phosphite and sulfate from electroless nickel–phosphorus plating bath with hydrotalcite for the management of watershed

Contact Info

Product

Resources

About