Université de Bourgogne Franche-Comté, UFR Sciences & Techniques, UMR Chrono-environnement, 6249, Besançon, France; University Politehnica of Bucharest, Faculty of Applied Chemistry and Materials Science, Bucharest, Romania.
Université de Bourgogne Franche-Comté, UFR Sciences & Techniques, UMR Chrono-environnement, 6249, Besançon, France.
Chemosphere. 2017 Apr;172:111-119. doi: 10.1016/j.chemosphere.2016.12.132. Epub 2016 Dec 29.
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), SO (∼1.1 g L), Cl (∼9.5 g L), and Ca (∼5 g L), 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 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 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.
首次使用商业氧化铁浸渍强碱阴离子交换树脂 Purolite FerrIX A33E 研究了从合成溶液和燃煤电厂产生的实际烟气脱硫 (FGD) 废水中去除硒。在合成溶液中，树脂对硒酸盐和亚硒酸盐表现出高亲和力，而硫酸盐对两种含氧阴离子都表现出强烈的竞争。所研究的 FGD 废水是一种复杂的系统，其中含有 Se（约 1200μg/L）、SO（约 1.1g/L）、Cl（约 9.5g/L）和 Ca（约 5g/L），以及包括 Cd、Cr、Hg、Ni 和 Zn 在内的多种有毒痕量金属。树脂在原始 FGD 废水中对 Se 的去除效果不佳，但对 Cd、Cr、Hg 和 Zn 等几种痕量元素的去除具有中等至良好的效果。在 FGD 废水中，硫酸盐被确定为对 Se 具有高亲和力的强大竞争阴离子，对树脂的交换活性位点具有高亲和力。使用 BaCl2 脱硫可将 Se 的去除率从 3%（未脱硫废水）提高到 80%（脱硫废水），通过沉淀和离子交换联合处理。然而，由于存在碳酸氢盐，其作为硫酸盐与钡的竞争物，因此无法使用等摩尔 BaCl2 实现完全脱硫。除了去除硒和硫酸盐外，几种有毒金属（Cd：91%；Cr：100%；Zn：99%）也可通过联合（脱硫和离子交换）处理有效去除。
