Mining and mineral processing of gold-bearing ores often release arsenic to the environment. Ammonium is released when N-based explosives or cyanide are used. Nitrification of simulated As-rich mining waters was investigated in batch bioassays using nitrifying cultures enriched in a fluidized-bed reactor (FBR). Nitrification was maintained at 100 mg AsTOT/L. In batch assays, ammonium was totally oxidized by the FBR enrichment in 48 h. As(III) oxidation to As(V) occurred during the first 3 h attenuating arsenic toxicity to nitrification. At 150 and 200 mg AsTOT/L, nitrification was inhibited by 25%. Candidatus Nitrospira defluvii and other nitrifying species mainly colonized the FBR. In conclusion, the FBR enriched cultures of municipal activated sludge origins tolerated high As concentrations making nitrification a potent process for mining water treatment.

Effect of As on nitrification of ammonium-rich mining waters / Papirio, Stefano; Zou, G.; Ylinen, A.; Di Capua, F.; Pirozzi, Francesco; Puhakka, J. A.. - In: BIORESOURCE TECHNOLOGY. - ISSN 0960-8524. - 164:(2014), pp. 149-154. [10.1016/j.biortech.2014.04.072]

Effect of As on nitrification of ammonium-rich mining waters

PAPIRIO, Stefano;PIROZZI, FRANCESCO;
2014

Abstract

Mining and mineral processing of gold-bearing ores often release arsenic to the environment. Ammonium is released when N-based explosives or cyanide are used. Nitrification of simulated As-rich mining waters was investigated in batch bioassays using nitrifying cultures enriched in a fluidized-bed reactor (FBR). Nitrification was maintained at 100 mg AsTOT/L. In batch assays, ammonium was totally oxidized by the FBR enrichment in 48 h. As(III) oxidation to As(V) occurred during the first 3 h attenuating arsenic toxicity to nitrification. At 150 and 200 mg AsTOT/L, nitrification was inhibited by 25%. Candidatus Nitrospira defluvii and other nitrifying species mainly colonized the FBR. In conclusion, the FBR enriched cultures of municipal activated sludge origins tolerated high As concentrations making nitrification a potent process for mining water treatment.
2014
Effect of As on nitrification of ammonium-rich mining waters / Papirio, Stefano; Zou, G.; Ylinen, A.; Di Capua, F.; Pirozzi, Francesco; Puhakka, J. A.. - In: BIORESOURCE TECHNOLOGY. - ISSN 0960-8524. - 164:(2014), pp. 149-154. [10.1016/j.biortech.2014.04.072]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/584683
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