Instituto Maua Of Tecnologia Eem Imt

São Caetano do Sul, Brazil

Instituto Maua Of Tecnologia Eem Imt

São Caetano do Sul, Brazil

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De Novaes L.F.,University of Sao Paulo | Borges L.O.,University of Sao Paulo | Rodrigues J.A.D.,Instituto Maua Of Tecnologia Eem Imt | Ratusznei S.M.,Instituto Maua Of Tecnologia Eem Imt | And 2 more authors.
Applied Biochemistry and Biotechnology | Year: 2010

Many lab-scale studies have been carried out regarding the effect of feed strategy on the performance of anaerobic sequencing batch reactors (ASBR); however, more detailed pilot-scale studies should be performed to assess the real applicability of this type of operation. Therefore, the objective of this work was to assess the effect of feed strategy or fill time in a 1-m3 mechanically stirred pilot-scale sequencing batch reactor, treating 0.65 m 3 sanitary wastewater in 8-h cycles at ambient temperature. Two reactor configurations were used: one containing granular biomass (denominated ASBR) and the other immobilized biomass on polyurethane foam as inert support (denominated anaerobic sequencing batch biofilm reactor (AnSBBR)). The reactors were operated under five distinct feed strategies, namely: typical batch and fed-batch for 25%, 50%, 75%, and 100% of the cycle length. Stirring frequency in the ASBR was 40 rpm with two flat-blade turbine impellers and 80 rpm in the AnSBBR with two helix impellers. The results showed that both the ASBR and AnSBBR when operated under typical batch, fed-batch for 50% and 75% of the cycle length, presented improved organic matter removal efficiencies, without significant differences in performance, thus showing important operational flexibility. In addition, the reactors presented operation stability under all conditions. © Humana Press 2009.


Carvalhinha P.P.,Instituto Maua Of Tecnologia Eem Imt | Carvalhinha P.P.,University of Sao Paulo | Flores A.,Instituto Maua Of Tecnologia Eem Imt | Rodrigues J.A.D.,Instituto Maua Of Tecnologia Eem Imt | And 3 more authors.
Applied Biochemistry and Biotechnology | Year: 2010

An investigation was performed regarding the application of a mechanically stirred anaerobic sequencing batch biofilm reactor containing immobilized biomass on inert polyurethane foam (AnSBBR) to the treatment of soluble metalworking fluids to remove organic matter and produce methane. The effect of increasing organic matter and reactor fill time, as well as shock load, on reactor stability and efficiency have been analyzed. The 5-L AnSBBR was operated at 30∈°C in 8-h cycles, agitation of 400 rpm, and treated 2.0 L effluent per cycle. Organic matter was increased by increasing the influent concentration (500, 1,000, 2,000, and 3,000 mg chemical oxygen demand (COD)/L). Fill times investigated were in the batch mode (fill time 10 min) and fed-batch followed by batch (fill time 4 h). In the batch mode, organic matter removal efficiencies were 87%, 86%, and 80% for influent concentrations of 500, 1,000, and 2,000 mgCOD/L (1.50, 3.12, and 6.08 gCOD/L.d), respectively. At 3,000 mgCOD/L (9.38 gCOD/L.d), operational stability could not be achieved. The reactor managed to maintain stability when a shock load twice as high the feed concentration was applied, evidencing the robustness of the reactor to potential concentration variations in the wastewater being treated. Increasing the fill time to 4 h did not improve removal efficiency, which was 72% for 2,000 mgCOD/L. Thus, gradual feeding did not improve organic matter removal. The concentration of methane formed at 6.08 gCOD/L was 5.20 mmolCH4, which corresponded to 78% of the biogas composition. The behavior of the reactor during batch and fed-batch feeding could be explained by a kinetic model that considers organic matter consumption, production, and consumption of total volatile acids and methane production. © 2010 Springer Science+Business Media, LLC.


Costabile A.L.O.,Instituto Maua Of Tecnologia Eem Imt | Canto C.S.A.,Instituto Maua Of Tecnologia Eem Imt | Ratusznei S.M.,Instituto Maua Of Tecnologia Eem Imt | Rodrigues J.A.D.,Instituto Maua Of Tecnologia Eem Imt | And 2 more authors.
Journal of Environmental Management | Year: 2011

The objective of this work was to analyze the interaction effects between temperature, feed strategy and COD/[SO 4 2-] levels, maintaining the same ratio, on sulfate and organic matter removal efficiency from a synthetic wastewater. This work is thus a continuation of Archilha et al. (2010) who studied the effect of feed strategy at 30 °C using different COD/[SO 4 2-] ratios and levels. A 3.7-L anaerobic sequencing batch reactor with recirculation of the liquid phase and which contained immobilized biomass on polyurethane foam (AnSBBR) was used to treat 2.0 L synthetic wastewater in 8 h cycles. The temperatures of 15, 22.5 and 30 °C with two feed strategies were assessed: (a) batch and (b) batch followed by fed-batch. In strategy (a) the reactor was fed in 10 min with 2 L wastewater containing sulfate and carbon sources. In strategy (b) 1.2 L wastewater (containing only the sulfate source) was fed during the first 10 min of the cycle and the remaining 0.8 L (containing only the carbon source) in 240 min. Based on COD/[SO 4 2-] = 1 and on the organic matter (0.5 and 1.5 gCOD/L) and sulfate (0.5 and 1.5 gSO 4 2-/L) concentrations, the sulfate and organic matter loading rates applied were 1.5 and 4.5 g/L.d, i.e., same COD/[SO 4 2-] ratio (=1) but different levels (1.5/1.5 and 4.5/4.5 gCOD/gSO 4 2-). When reactor feed was 1.5 gCOD/L.d and 1.5 gSO 4 2-/L.d, gradual feeding (strategy b) showed to favor sulfate and organic matter removal in the investigated temperature range, indicating improved utilization of the electron donor for sulfate reduction. Sulfate removal efficiencies were 87.9; 86.3 and 84.4%, and organic matter removal efficiencies 95.2; 86.5 and 80.8% at operation temperatures of 30; 22.5 and 15 °C, respectively. On the other hand, when feeding was 4.5 gCOD/L.d and 4.5 gSO 4 2-/L.d, gradual feeding did not favor sulfate removal, indicating that gradual feeding of the electron donor did not improve sulfate reduction. © 2011 Elsevier Ltd.


Farias de Novaes L.,University of Sao Paulo | Saratt B.L.,University of Sao Paulo | Rodrigues J.A.D.,Instituto Maua Of Tecnologia Eem Imt | Ratusznei S.M.,Instituto Maua Of Tecnologia Eem Imt | And 4 more authors.
Journal of Environmental Management | Year: 2010

The objective of this work was to assess the effect of agitation rate and impeller type in two mechanically stirred sequencing batch reactors: one containing granulated biomass (denominated ASBR) and the other immobilized biomass on polyurethane foam (denominated AnSBBR). Each configuration, with total volume of 1m3, treated 0.65m3 sanitary wastewater at ambient temperature in 8-h cycles. Three impeller types were assessed for each reactor configuration: flat-blade turbine impeller, 45°-inclined-blade turbine impeller and helix impeller, as well as two agitation rates: 40 and 80rpm, resulting in a combination of six experimental conditions. In addition, the ASBR was also operated at 20rpm with a flat-blade turbine impeller and the AnSBBR was operated with a draft tube and helix impeller at 80 and 120rpm. To quantify how impeller type and agitation rate relate to substrate consumption rate, results obtained during monitoring at the end of the cycle, as well as the time profiles during a cycle were analyzed. Increasing agitation rate from 40rpm to 80rpm in the AnSBBR improved substrate consumption rate whereas in the ASBR this increase destabilized the system, likely due to granule rupture caused by the higher agitation. The AnSBBR showed highest solids and substrate removal, highest kinetic constant and highest alkalinity production when using a helix impeller, 80rpm, and no draft tube. The best condition for the ASBR was achieved with a flat-blade turbine impeller at 20rpm. The presence of the draft tube in the AnSBBR did not show significant improvement in reactor efficiency. Furthermore, power consumption studies in these pilot scale reactors showed that power transfer required to improve mass transfer might be technically and economically feasible. © 2010 Elsevier Ltd.


Archilha N.C.,Instituto Maua Of Tecnologia Eem Imt | Canto C.S.A.,Instituto Maua Of Tecnologia Eem Imt | Ratusznei S.M.,Instituto Maua Of Tecnologia Eem Imt | Rodrigues J.A.D.,Instituto Maua Of Tecnologia Eem Imt | And 2 more authors.
Journal of Environmental Management | Year: 2010

The objective of this work was to analyze the effect of the interaction between feeding strategy and COD/sulfate ratio on the removal efficiency of sulfate and organic matter from a synthetic wastewater. An anaerobic sequencing batch reactor with recirculation of the liquid phase and containing immobilized biomass on polyurethane foam (AnSBBR) was used. The AnSBBR with a total volume of 3.7L, treated 2.0L synthetic wastewater in 8-h cycles at 30±1°C and was inoculated with anaerobic biomass from a UASB. Two feeding strategies were assessed: (a) batch and (b) batch followed by fed-batch. In strategy (a) the reactor was fed in 10min with 2L wastewater containing sulfate and carbon sources. In strategy (b) 1.2L wastewater (containing only the sulfate source) was fed during the first 10min of the cycle and the remaining 0.8L (containing only the carbon source) in 240min. The COD/sulfate ratios assessed were 1 and 3. Based on these values and on the concentrations of organic matter (0.5-11.25gCOD/L) and sulfate (0.5 and 2.5gSO42-/L), the sulfate and organic matter loading rates applied equaled 1.5 and 4.5gSO42-/Ld for sulfate and 1.5, 4.5 and 13.5gCOD/Ld for organic matter. After stabilization of the system time profiles were run of monitored parameters (COD, sulfate, sulfide and sulfite). In general, the reactor showed to be robust for use in the anaerobic treatment of wastewaters containing sulfate. Gradual feeding (strategy b) of the carbon source favored sulfate reduction, resulting in sulfate removal efficiencies of 84-98% and organic matter removal efficiencies of 48-95%. The best results were observed under COD/sulfate ratio equal to 1 (loading rates of 1.5 and 4.5gSO42-/Ld for sulfate, and 1.5 and 4.5gCOD/Ld for organic matter). When COD/sulfate ratio was 3 (loading rates of 1.5and 4.5gSO42-/Ld for sulfate, and 4.5 and 13.5gCOD/Ld for organic matter) the effect of feed mode became less significant. These results show that the strategy batch followed by fed-batch is more advantageous for COD/sulfate ratios near the stoichiometric value (0.67) and higher organic matter and sulfate concentrations. © 2010 Elsevier Ltd.


Contrera R.C.,University of Sao Paulo | da Cruz Silva K.C.,University of Sao Paulo | Morita D.M.,University of Sao Paulo | Domingues Rodrigues J.A.,Instituto Maua Of Tecnologia Eem Imt | And 2 more authors.
Journal of Environmental Management | Year: 2014

This paper reports the kinetics evaluation of landfill leachate anaerobic treatment in a pilot-scale Anaerobic Sequence Batch Biofilm Reactor (AnSBBR). The experiment was carried out at room temperature (23.8±2.1°C) in the landfill area in São Carlos-SP, Brazil. Biomass from the bottom of a local landfill leachate stabilization pond was used as inoculum. After acclimated and utilizing leachate directly from the landfill, the AnSBBR presented efficiency over 70%, in terms of COD removal, with influent COD ranging from 4825mgL-1 to 12,330mgL-1. To evaluate the kinetics of landfill leachate treatment, temporal profiles of CODFilt. concentration were performed and a first-order kinetics model was adjusted for substrate consumption, obtaining an average k1=4.40×10-5LmgTVS-1d-1, corrected to 25°C. Considering the temperature variations, a temperature-activity coefficient θ=1.07 was obtained. Statistical "Randomness" and "F" tests were used to successfully validate the model considered. Thus, the results demonstrate that the first-order kinetic model is adequate to model the anaerobic treatment of the landfill leachate in the AnSBBR. © 2014 Elsevier Ltd.


Silva R.C.,Instituto Maua Of Tecnologia Eem Imt | Rodrigues J.A.D.,Instituto Maua Of Tecnologia Eem Imt | Ratusznei S.M.,Instituto Maua Of Tecnologia Eem Imt | Zaiat M.,University of Sao Paulo
Applied Biochemistry and Biotechnology | Year: 2013

A mechanically stirred anaerobic sequencing batch reactor (5 L, 30 C) containing granular biomass was used to treat the effluent of an industrial biodiesel production process with the purpose to produce methane. Process stability and efficiency were analyzed as a function of applied volumetric organic load (AVOL of 1,000 to 3,000 mgCOD/L), reactor feed time, and cycle length (8-h cycles with 10-min or 4-h feeding and 4-h cycles with 10-min or 2-h feeding). Batch operations (B) with 1,000 to 3,000 mgCOD/L involved 10-min feeding/discharge: (1) 1.0-L influent with 4-h cycle and (2) 2.0-L influent with 8-h cycle. Fed-batch operations (FB) with 1,000 to 3,000 mgCOD/L involved 10-min discharge and the following feeding: (1) 1.0-L influent in 2 h with 4-h cycle and (2) 2.0-L influent in 4 h with 8-h cycle. At 1,000 mgCOD/L (AVOL of 18 to 1.29 gCOD/L day), kinetic parameter values were 1.03 and 0.92 h-1 at conditions B-1000-4 h and FB-1000-8/4 h, respectively. At both conditions, removal efficiency was 88 %, and cycle length could be reduced to 3 h (B-1000-4 h) and 5 h (FB-1000-8/4 h). At 2,000 mgCOD/L (AVOL of 2.38 to 2.52 gCOD/L day), kinetic parameter values were 1.08 and 0.99 h-1 at conditions B-2000-4/2 h and FB-2000-8/4 h, respectively, and removal efficiencies were 83 and 81 %. Cycle length could be reduced to 3 h (B-2000-4/2 h) and 6 h (FB-2000-8/4 h). At 3,000 mgCOD/L (AVOL of 3.71 to 3.89 gCOD/L day), conditions allowing stable operation were B-3000-4 h, FB-3000-8/4 h, and FB-3000-4/2 h. Stability could not be obtained at condition B-3000-8 h, and the best results were obtained at condition FB-3000-8/4 h. Specific methane production ranged from 41.1 to 93.7 NmLCH4/gCOD, demonstrating reactor application potential and operation flexibility. © 2013 Springer Science+Business Media New York.


PubMed | Instituto Maua Of Tecnologia Eem Imt and University of Sao Paulo
Type: | Journal: Journal of environmental management | Year: 2014

This paper reports the kinetics evaluation of landfill leachate anaerobic treatment in a pilot-scale Anaerobic Sequence Batch Biofilm Reactor (AnSBBR). The experiment was carried out at room temperature (23.82.1C) in the landfill area in So Carlos-SP, Brazil. Biomass from the bottom of a local landfill leachate stabilization pond was used as inoculum. After acclimated and utilizing leachate directly from the landfill, the AnSBBR presented efficiency over 70%, in terms of COD removal, with influent COD ranging from 4825mgL(-1) to 12,330mgL(-1). To evaluate the kinetics of landfill leachate treatment, temporal profiles of CODFilt. concentration were performed and a first-order kinetics model was adjusted for substrate consumption, obtaining an average k1=4.4010(-5)LmgTVS(-1)d(-1), corrected to 25C. Considering the temperature variations, a temperature-activity coefficient =1.07 was obtained. Statistical Randomness and F tests were used to successfully validate the model considered. Thus, the results demonstrate that the first-order kinetic model is adequate to model the anaerobic treatment of the landfill leachate in the AnSBBR.

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