title: Fed-batch and batch operating mode analysis of a stirred anaerobic sequencing reactor with self-immobilized biomass treating low-strength wastewater.
abstract: This work presents an analysis of a stirred anaerobic sequencing discontinuous reactor with different substrate feeding strategies resulting in batch, fed-batch/batch and fed-batch operating modes. The reactor, containing granulated biomass, was fed with approximately 2.0L of synthetic domestic wastewater with Chemical Oxygen Demand of nearly 500 mg/L per cycle and operated at 30 degrees C and 50 rpm. Three feeding strategies with a total cycle time of 6 h, including 30-min settling, were adopted: batch mode with a fill cycle of 6 min, a fed-batch/batch mode with fill cycles of 60, 120 and 240 min and fed-batch mode with a fill cycle of 320 min. The system attained average non-filtered and filtered substrate removal efficiency of 78 and 84%, respectively, for all operating conditions, presenting good stability, solid retention and no granule break-up. A first order kinetic model with a residual organic matter concentration was proposed to analyze the influence of the feeding strategy on the performance during a cycle and bicarbonate alkalinity and total volatile acids concentration profiles were also quantified in order to verify the transient stability behavior.
authors.affiliation: Departamento de Engenharia Qui;mica e de Alimentos-Escola de Engenharia Mauá-Instituto Mauá de Tecnologia (IMT); Praça Mauá 1; CEP 09.580-900; São, SP, Caetano do Sul, Brazil. rodrigues@maua.br
authors.forename: José Alberto Domingues
authors.initials: JA
authors.lastname: Rodrigues
authors.forename: Suzana Maria
authors.initials: SM
authors.lastname: Ratusznei
authors.forename: Marcelo
authors.initials: M
authors.lastname: Zaiat
mesh_terms: D001421:Bacteria, Anaerobic / Q000502:physiology*; D018533:Biomass; D019149:Bioreactors; D007700:Kinetics; D008962:Models, Theoretical; D010100:Oxygen / Q000737:chemistry; D014865:Waste Disposal, Fluid / Q000379:methods*; D018508:Water Purification / Q000379:methods*
chemical_list: D010100:Oxygen