Deep removal of arsenic from regenerated products of spent V2O5-WO3/TiO2 SCR catalysts and its concurrent activation by bioleaching through a novel mechanism

• Bioleaching is good at deep As removal from regenerated product of spent SCR catalyst. results in a maximum 53.1% high pulp density 10%. Corresponding residue 174 mg/kg below limiting value 200 attained. Strong activation occurs by bioleaching along with removal. Cells secrete an amount cysteine accounting for and activation. Selective catalytic reaction (SCR) widely used flue gas denitrification to convert NO x air pollutants into N 2 H O the presence catalyst, but arsenic poisoning causes serious deactivation catalyst produces huge worldwide. Therefore, regeneration recycling catalysts are great necessity sustainable due very cost replacing commercial catalysts. Nowadays, combination alkali treatment acid washing usually regenerate However, strongly inhibits activity products. In this study, active liquor produced Acidithiobacillus thiooxidans as indirect was attempted deeply remove first time. The showed that resulted maximal even 10% harvest minimum mg/kg; whereas SO 4 leaching attained 6.7% 345 residue. A stronger products simultaneously occurred bioleaching. secreted microbe accounts both enhancement strong product. novel mechanism proposed explain excellent based on nucleophilic attack sulfhydryl groups cysteine.