Jéssyca de Freitas Lima Brito
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Camylla Rachelle Aguiar Araújo
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Gabriel Alfredo Garcia Neto
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André Bezerra dos Santos
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Marcos Erick Rodrigues da Silva
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Abstract
This work assessed the effect of adding different concentrations of nitrate (50–300 mg ·L−1) on the removal of dissolved and gaseous sulfide in an anaerobic reactor treating synthetic effluent containing sulfate (100 mg ·L−1) and organic matter (1 g COD·L−1). Autotrophic denitrification, stimulated by the addition of nitrate, was demonstrated to be a very effective approach for removal of dissolved sulfide even in the presence of a high concentration of organic matter (complete removal with 50 mg mg·L−1). However, it had a minor effect on H2S(g). Sulfide remained partially oxidized to elemental sulfur even with excess nitrate (100–300 mg mg·L−1). Therefore, the competition for this electron acceptor between the autotrophic and heterotrophic denitrification pathways may have prevented the conversion of the generated sulfide into sulfate again. No evidence of inhibition of methanogenesis and sulfidogenesis was found during nitrate supplementation.
Corrigendum to “Elemental sulfur-based autotrophic denitrification in stoichiometric S0/N ratio: Calibration and validation of a kinetic model” [Bioresour. Technol. 307 (2020) 123229]
