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Effects of different nickel species on autotrophic denitrification driven by thiosulfate in batch tests and a fluidized-bed reactor

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Details

Original languageEnglish
Pages (from-to)534-541
Number of pages8
JournalBioresource Technology
Volume238
DOIs
Publication statusPublished - 1 Aug 2017
Publication typeA1 Journal article-refereed

Abstract

Nickel is a common heavy metal and often occurs with nitrate (NO3 ) in effluents from mining and metal-finishing industry. The present study investigates the effects of increasing concentrations (5–200 mg Ni/L) of NiEDTA2− and NiCl2 on autotrophic denitrification with thiosulfate (S2O3 2−) in batch tests and a fluidized-bed reactor (FBR). In batch bioassays, 50 and 100 mg Ni/L of NiEDTA2− only increased the transient accumulation of NO2 , whereas 25–100 mg Ni/L of NiCl2 inhibited denitrification by 9–19%. NO3 and NO2 were completely removed in the FBR at feed NiEDTA2− and NiCl2 concentrations as high as 100 and 200 mg Ni/L, respectively. PCR-DGGE revealed the dominance of Thiobacillus denitrificans and the presence of the sulfate-reducing bacterium Desulfovibrio putealis in the FBR microbial community at all feed nickel concentrations investigated. Nickel mass balance, thermodynamic modeling and solid phase characterization indicated that nickel sulfide, phosphate and oxide precipitated in the FBR during NiCl2 injection.

Keywords

  • Autotrophic denitrification, EDTA, Fluidized-bed reactor, Nickel, Thiosulfate

Publication forum classification

Field of science, Statistics Finland