title: Influence of feed time and sulfate load on the organic and sulfate removal in an ASBR.
abstract: The removal of sulfate and organic matter was assessed in an ASBR, which treated wastewater containing 500 mg CODL(-1) (3 g CODL(-1)d(-1)) in 8h-cycles at 30 degrees C. The wastewater was enriched with sulfate at [COD/SO(4)(2-)] ratios of 1.34, 0.67 and 0.34 (8.8,4.5 and 2.2 gSO(4)(2-)L(-1)d(-1)). For each COD/[SO(4)(2-)] ratio fill times used were: 10 min (batch), 3 and 6h (fed-batch), achieving sulfate reduction of 30%, 72% and 72% (COD/[SO(4)(2-)] of 1.34); 25%, 58% and 55% (COD/[SO(4)(2-)] of 0.67) and 23%, 37% and 27% (COD/[SO(4)(2-)] of 0.34), respectively, and organic matter removal of 87%, 68% and 80% (COD/[SO(4)(2-)] of 1.34); 78%, 75% and 69% (COD/[SO(4)(2-)] of 0.67) and 85%, 84% and 83% (COD/[SO(4)(2-)] of 0.34), respectively. The results showed that fed-batch operation improved sulfate reduction, whereas organic matter removals were similar for batch and fed-batch operation. In addition, increase in sulfate loading in the fed-batch operation improved organic matter removal.
authors.affiliation: Departamento de Hidráulica e Saneamento - Escola de Engenharia de São Carlos - Universidade de São Paulo (USP), Av. Trabalhador São-Carlense 400, CEP 13566-590, São Carlos - SP, Brazil.
authors.forename: Gustavo
authors.initials: G
authors.lastname: Mockaitis
authors.forename: Gregor F
authors.initials: GF
authors.lastname: Friedl
authors.forename: José A D
authors.initials: JA
authors.lastname: Rodrigues
authors.forename: Suzana M
authors.initials: SM
authors.lastname: Ratusznei
authors.forename: Marcelo
authors.initials: M
authors.lastname: Zaiat
authors.forename: Eugênio
authors.initials: E
authors.lastname: Foresti
mesh_terms: D000693:Anaerobiosis; D018533:Biomass; D019149:Bioreactors; D009930:Organic Chemicals / Q000302:isolation & purification*; D013431:Sulfates / Q000032:analysis* / Q000302:isolation & purification
chemical_list: D009930:Organic Chemicals; D013431:Sulfates