Boron removal from colemanite mine wastewater by coagulation using zinc hydroxide―A factorial optimization study
Özet
In this study, boron removal from synthetic solutions and colemanite mine wastewater by coagulation
method using in-situ generated zinc hydroxide from zinc chloride salt was investigated. The parameters
for Jar test experiments were solution pH (8-12), concentration (50-750 mg/L), temperature (12-40oC),
and zinc chloride dosage (1.0204-10.204 g). The saturation pH of zinc hydroxide is 8.93. The boron
adsorption capacity reached to maximum value at pH value of 9 and this pH was selected as optimum
value. Boron adsorption capacity increased with increasing concentration due to increasing driving force
of concentration. High dosages increased the removal percentage. The adsorption of boron to zinc
hydroxide had exothermic nature. The optimum conditions obtained from synthetic solutions were applied
to the colemanite mine wastewater by 22
factorial designs. The maximum boron adsorption capacity of
zinc hydroxide from colemanite mine wastewater was calculated as 43.57 mg/g. The used material and
process was promising for boron mine wastewater. The end product of removal from mine wastewater
may be used in zinc borate production by solid-state reactions by calcinations.
