Influence of temperature on performance of an anaerobic sequencing biofilm batch reactor with circulation applied to treatment of low-strength wastewater.
The effect of temperature on the performance of an anaerobic sequencing biofilm batch reactor (ASBBR) with liquid-phase recirculation was assessed. Assays were performed using a recirculation velocity of 0.20 cm/s, 8-h cycles, and an average treated synthetic wastewater volume of 2 L/cycle with a concentration of 500 mg of Chemical Oxygen Demand (COD)/L. Operation temperatures were 15, 20, 25, 30, and 35 degrees C. At 25, 30, and 35 degrees C, organic matter removal efficiencies for filtered samples ranged from 81 to 83%. At lower temperatures, namely 15 and 20 degrees C, removal efficiency decreased significantly to 61 and 65%, respectively. A first-order model could be fitted to the experimental concentration profile values. The first-order kinetic parameter value of this model varied from 0.46 to 0.81 h-1 considering the lowest and highest temperature studied. Moreover, analysis of the removal profile values allowed fitting of an Arrhenius-type equation with an activation energy of 5715 cal/mol.
Agibert
Silvia Ainara Cardoso
SA
Escola de Engenharia Mauá, Instituto Mauá de Tecnologia, Praça Mauá 1, CEP 09.580-900, São Caetano do Sul, SP, Brazil.
Moreira
Mariana Bueno
MB
Ratusznei
Suzana Maria
SM
Rodrigues
José Alberto Domingues
JA
Zaiat
Marcelo
M
Foresti
Eugênio
E
D001421:Bacteria, Anaerobic / Q000378:metabolism*; D018441:Biofilms / Q000254:growth & development*; D019149:Bioreactors; D013696:Temperature; D014865:Waste Disposal, Fluid / Q000379:methods*; D014872:Water Movements; D018508:Water Purification