Comparison between two different fixed-bed reactor configurations for nitrogen removal coupled to biogas biodesulfurization

Autor(es)

Solcia Guerrero, Renata de Bello ^[1] ; Diniz dos Santos, Carla Eloisa ^[2] ; Soares, Lais Americo ^[1] ; Zaiat, Marcelo ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Ctr Res Dev & Innovat Environm Engn, Sao Carlos Sch Engn, Biol Proc Lab, EESC, Av Joao Dagnone 1100, BR-13563120 Sao Carlos, SP - Brazil

^[2] Fed Univ Triangulo Mineiro UFTM, Environm Engn Dept, Av Randolfo Borges Jr 1400, BR-38064200 Uberaba, MG - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Biochemical Engineering Journal; v. 162, OCT 15 2020.
• Citações Web of Science: 0

Resumo

A comparison between a mixed aerobic-anoxic horizontal fixed-bed reactor (MAAFBR) and an aerobic horizontal fixed-bed reactor coupled with an anoxic vertical fixed-bed reactor (AHFBR-AVFBR) was made in order to evaluate the nitrogen removal behavior when nitrification and sulfide-driven autotrophic denitrification occurred in a single unit or spatially separated. Both systems achieved Total-N removal efficiencies (RE) higher than 89 %. Moreover, for both reactors, the effluent pH was affected for bicarbonate alkalinities lower than 250 mg CaCO3 L-1 decreasing the biogas desulfurization from 98 to 50 % in the MAAFBR and from 100 to 61 % in the AVFBR. Hydraulic retention times (HRTs) of 6, 8, 10 and 12 h did not affect the nitrification RE on the AHFBR, maintaining values higher than 99 %. In both cases, biogas desulfurization was achieved. However, results suggested that elemental sulfur (S-0) was not predominantly formed due to the interference of oxygen. Such interference was more severe for the MAAFBR, in which the results implied diffusion of O-2 and H2S between the aerobic and anoxic chambers. (AU)

• Processo FAPESP: 15/18976-0 - Pós-tratamento de águas residuárias para remoção de compostos nitrogenados utilizando um reator misto horizontal anóxico-aeróbio alimentado com biogás e ar
• Beneficiário: Renata de Bello Solcia Guerrero
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 15/06246-7 - Aplicação do conceito de biorrefinaria a estações de tratamento biológico de águas residuárias: o controle da poluição ambiental aliado à recuperação de matéria e energia
• Beneficiário: Marcelo Zaiat
• Modalidade de apoio: Auxílio à Pesquisa - Temático