Enrichment of Autotrophic Denitrifiers From Anaerobic Sludge Using Sulfurous Electron Donors

Autor(es)

Carboni, M. F. ^{[1, 2]} ; Florentino, A. P. ^{[1, 2]} ; Costa, R. B. ^[3] ; Zhan, X. ^[4] ; Lens, P. N. L. ^{[1, 2]}

Afiliação do(s) autor(es)

^[1] Natl Univ Ireland Galway, Sch Nat Sci, Dept Microbiol, Galway - Ireland

^[2] Natl Univ Ireland Galway, Ryan Inst, Galway - Ireland

^[3] Sao Paulo State Univ, Dept Biochem & Organ Chem, Inst Chem, Araraquara, SP - Brazil

^[4] Natl Univ Ireland Galway, Sch Engn, Dept Civil Engn, Coll Sci & Engn, Galway - Ireland

• Tipo de documento: Artigo Científico
• Fonte: FRONTIERS IN MICROBIOLOGY; v. 12, JUN 7 2021.
• Citações Web of Science: 1

Resumo

This study compared the rates and microbial community development in batch bioassays on autotrophic denitrification using elemental sulfur (S-0), pyrite (FeS2), thiosulfate (S2O32-), and sulfide (S2-) as electron donor. The performance of two inocula was compared: digested sludge (DS) from a wastewater treatment plant of a dairy industry and anaerobic granular sludge (GS) from a UASB reactor treating dairy wastewater. All electron donors supported the development of a microbial community with predominance of autotrophic denitrifiers during the enrichments, except for sulfide. For the first time, pyrite revealed to be a suitable substrate for the growth of autotrophic denitrifiers developing a microbial community with predominance of the genera Thiobacillus, Thioprofundum, and Ignavibacterium. Thiosulfate gave the highest denitrification rates removing 10.94 mM NO3- day(-1) and 8.98 mM NO3- day(-1) by DS and GS, respectively. This was 1.5 and 6 times faster than elemental sulfur and pyrite, respectively. Despite the highest denitrification rates observed in thiosulfate-fed enrichments, an evaluation of the most relevant parameters for a technological application revealed elemental sulfur as the best electron donor for autotrophic denitrification with a total cost of 0.38 euro per m(3) of wastewater treated. (AU)

• Processo FAPESP: 18/01524-7 - Avaliação do bagaço de cana-de-açúcar como doador de elétron de lenta liberação para redução de sulfato acoplado à recuperação de metal de drenagem ácida de minas
• Beneficiário: Rachel Biancalana Costa
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Pós-Doutorado