Effects of solid-phase mass transfer on the performance of a stirred anaerobic sequencing batch reactor containing immobilized biomass

2007 ◽  
Vol 98 (7) ◽  
pp. 1411-1417 ◽  
Author(s):  
S.A. Cubas ◽  
E. Foresti ◽  
J.A.D. Rodrigues ◽  
S.M. Ratusznei ◽  
M. Zaiat
Keyword(s):  
Mass Transfer ◽  
Sequencing Batch Reactor ◽  
Solid Phase ◽  
Batch Reactor ◽  
Anaerobic Sequencing Batch Reactor ◽  
Immobilized Biomass

Influence of agitation rate on the performance of a stirred anaerobic sequencing batch reactor containing immobilized biomass

2001 ◽  
Vol 44 (4) ◽  
pp. 305-312 ◽  
Author(s):  
S. M. Ratusznei ◽  
J. A.D. Rodrigues ◽  
E. F.M. Camargo ◽  
M. Zaiat ◽  
W. Borzani
Keyword(s):  
Sequencing Batch Reactor ◽  
Batch Reactor ◽  
Domestic Wastewater ◽  
Agitation Rate ◽  
Order Kinetic ◽  
Mechanical Agitation ◽  
Anaerobic Sequencing Batch Reactor ◽  
Substrate Removal ◽  
Order Kinetic Model ◽  
Immobilized Biomass

The present work reports on the influence of the mechanical agitation rates on the performance of a stirred anaerobic sequencing batch reactor containing immobilized biomass on polyurethane foam, as inert support, treating synthetic domestic wastewater. The reactor was operated at 30°C and an 8-hour cycle was used to treat approximately 0.5 L of the synthetic substrate with a COD concentration of nearly 500 mg/L. The studied agitation rates ranged from no agitation to 750 rpm. The system attained non-filtered substrate removal efficiency greater than 83% when agitation was employed. A very short start-up period and good solid retention could be observed. The use of agitation increased the efficiency of the reactor and enabled reduction of the total cycle time. An empirical equation and a first-order kinetic model are proposed to analyze the influence of agitation rates on the reactor's performance.

Stirred anaerobic sequencing batch reactor containing immobilized biomass: a behavior study when submitted to different fill times

2004 ◽  
Vol 49 (11-12) ◽  
pp. 311-318 ◽  
Author(s):  
A.C. Borges ◽  
R.R. Siman ◽  
J.A.D. Rodrigues ◽  
S.M. Ratusznei ◽  
M. Zaiat ◽  
...  
Keyword(s):  
Organic Matter ◽  
Polyurethane Foam ◽  
Sequencing Batch Reactor ◽  
Batch Reactor ◽  
Viscous Material ◽  
Filling Stage ◽  
Anaerobic Sequencing Batch Reactor ◽  
Behavior Study ◽  
Operation Stability ◽  
Immobilized Biomass

The effect of the filling stage on the behavior of a mechanically stirred anaerobic sequencing batch reactor containing biomass immobilized on 1 cm polyurethane foam cubes was investigated. The reactor was made of acrylic with a capacity of 6.3 L, treating per cycle 2.5 L synthetic low-strength wastewater with a concentration of 500 mgCOD/L, at 30 ± 1°C. Eight-hour cycles (tC) and agitation of 500 rpm were utilized. At the beginning of each cycle 60% of the wastewater volume was treated, sufficient to completely cover the bed. The remaining volume was added at different fill times (tF) of 10, 120, 240, 260 and 480 min. The results obtained showed that ratios of tF/tC ≤ 0.5 enabled organic matter removal higher than 75% and 70% for filtered and non-filtered samples, respectively. Ratios of tF/tC > 0.5, despite operation stability, resulted in loss of efficiency and formation of viscous material, similar to extra-cellular polymeric substances.

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