Boron removal by aluminum modified pumice and aluminum hydroxide from boron mine wastewater-full factorial experimental design

Abstract

Boron removal by raw and aluminum modified pumice from Bigadiç colemanite mine wastewaters in Turkey were investigated. At Bigadiç mine, the colemanite ore is waited in water pools for swelling of attached clays (382 mg Boron/L) and then washed. The general wastewater of mine is stored in Çam Köy dam (608.1 mg Boron/L). The influence of pH (3-9), dilution ratio (1-10) and adsorbent dosage (1-05 g/50 mL) was studied for waiting pool wastewater. The maximum adsorption capacities of modified and raw pumice were calculated as 1.06 mg/g and 0.607 mg/g for waiting pool wastewater. In the experimental design for waiting pool wastewater, low and high parameter levels were pH (3 and 7), dilution fold (1 and 10) and adsorbent dosage (1 and 5 g/50 mL). According to confidence level (p<0.1) (23 factorial design), the statistically important sequence of factors for modified pumice were model constant, adsorbent amount, dilution, adsorbent amount-dilution ratio, pH-dilution ratio, pH, pH-adsorbent amount. The pseudo second order kinetic model described the boron adsorption. The isotherm data of study fitted to the Langmuir isotherm than Freundlich isotherm. As the adsorption capacity of aluminum modified pumice was not so high, the in-situ formed aluminum hydroxide was tested and provided about %75.35 boron removal from Çam Köy dam wastewater (608.1 mg Boron/L).Boron removal by raw and aluminum modified pumice from Bigadiç colemanite mine wastewaters in Turkey were investigated. At Bigadiç mine, the colemanite ore is waited in water pools for swelling of attached clays (382 mg Boron/L) and then washed. The general wastewater of mine is stored in Çam Köy dam (608.1 mg Boron/L). The influence of pH (3-9), dilution ratio (1-10) and adsorbent dosage (1-05 g/50 mL) was studied for waiting pool wastewater. The maximum adsorption capacities of modified and raw pumice were calculated as 1.06 mg/g and 0.607 mg/g for waiting pool wastewater. In the experimental design for waiting pool wastewater, low and high parameter levels were pH (3 and 7), dilution fold (1 and 10) and adsorbent dosage (1 and 5 g/50 mL). According to confidence level (p<0.1) (23 factorial design), the statistically important sequence of factors for modified pumice were model constant, adsorbent amount, dilution, adsorbent amount-dilution ratio, pH-dilution ratio, pH, pH-adsorbent amount. The pseudo second order kinetic model described the boron adsorption. The isotherm data of study fitted to the Langmuir isotherm than Freundlich isotherm. As the adsorption capacity of aluminum modified pumice was not so high, the in-situ formed aluminum hydroxide was tested and provided about %75.35 boron removal from Çam Köy dam wastewater (608.1 mg Boron/L).