Desulfurization: Critical step towards enhanced selenium removal from industrial effluents
Abstract Selenium (Se) removal from synthetic solutions and from real Flue Gas Desulfurization (FGD) wastewater generated by a coal-fired power plant was studied for the first time using a commercial iron oxide impregnated strong base anion exchange resin, Purolite ? FerrIX A33E. In synthetic solutions, the resin showed high affinity for selenate and selenite, while sulfate exhibited a strong competition for both oxyanions. The FGD wastewater investigated is a complex system that contains Se (∼1200?μg?L −1 ), SO 4 2− (∼1.1?g?L −1 ), Cl − (∼9.5?g?L −1 ), and Ca 2+ (∼5?g?L −1 ), alongside a broad spectrum of toxic trace metals including Cd, Cr, Hg, Ni, and Zn. The resin performed poorly against Se in the raw FGD wastewater and showed moderate to good removal of several trace elements such as Cd, Cr, Hg, and Zn. In FGD effluent, sulfate was identified as a powerful competing anion for Se, having high affinity for the exchange active sites of the resin. The desulfurization of the FGD effluent using BaCl 2 led to the increase in Se removal from 3% (non-desulfurized effluent) to 80% (desulfurized effluent) by combined precipitation and ion exchange treatment. However, complete desulfurization using equimolar BaCl 2 could not be achieved due to the presence of bicarbonate that acts as a sulfate competitor for barium. In addition to selenium and sulfate removal, several toxic metals were efficiently removed (Cd: 91%; Cr: 100%; Zn: 99%) by the combined (desulfurization and ion exchange) treatment. Highlights Flue Gas Desulfurization (FGD) effluent was treated using FerrIX A33E resin. FerrIX A33E showed limited Se removal ( Desulfurization of FGD using BaCl 2 led to 61% Se removal. 80% Se removal was achieved using desulfurized FGD effluent treated by FerrIX A33E. Several toxic metals were also efficiently removed (Cd: 91%; Cr: 100%; Zn: 99%).
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- DOI : http://dx.doi.org/10.1016/j.chemosphere.2016.12.132
- Elsevier : 저널> 권호 > 논문
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