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Silvio Silvério Da Silva - One of the best experts on this subject based on the ideXlab platform.
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hemicellulosic ethanol production in fluidized bed reactor from sugar cane bagasse hydrolysate interplay among carrier concentration and Aeration Rate
ACS Sustainable Chemistry & Engineering, 2017Co-Authors: Felipe A F Antunes, Anuj K Chandel, Julio Cesar Dos Santos, Thais S S Milessi, G F D Peres, Silvio Silvério Da SilvaAbstract:Development of an efficient consolidated process is pivotal in order to design industrially viable processes for conversion of lignocellulosic biomass into second generation (2G) ethanol. Aiming to develop process consolidation, here we explored fluidized bed reactor (FBR) for 2G ethanol production from sugar cane bagasse hemicellulosic hydrolysate (SBHH) employing calcium alginate immobilized cells of Scheffersomyces shehatae UFMG-HM 52.2. A 22-full factorial design of experiments was carried out in order to evaluate the effect of Aeration Rate (0.027, 0.069, and 0.111 min–1) and carrier concentration (55.55, 83.33, and 111.11 g. L–1) on the ethanol yield (YP/S) and productivity (QP). Both process variables, when used at the highest level (Aeration, 0.11 min–1; immobilized carrier concentration, 111.11 g. L–1), showed maximum ethanol production (YP/S, 0.26 g/g and QP 0.17 g·L–1·h–1). Results showed the potential to use this immobilized yeast in a fluidized bed reactor for ethanol production from C5 sugar...
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Xylitol production in a bubble column bioreactor: Influence of the Aeration Rate and immobilized system concentration
Process Biochemistry, 2007Co-Authors: Ricardo De Freitas Branco, Júlio C. Santos, Lucilene Y. Murakami, Solange I. Mussatto, Giuliano Dragone, Silvio Silvério Da SilvaAbstract:Abstract This work evaluated the xylitol production from sugarcane bagasse hemicellulosic hydrolysate in a bubble column bioreactor using cells of the yeast Candida guilliermondii immobilized in calcium-alginate. The fermentation runs were performed according to a 2 2 full factorial design with three replicates at the center point in order to determine the effect of the variables: Aeration Rate (0.66–1.33 vvm) and immobilized system concentration (20–40% v/v), on the efficiency of xylose-to-xylitol conversion and on the xylitol volumetric productivity. The results indicated a significant influence of both variables on xylitol production. The highest conversion efficiency (41%) was attained using 1.33 vvm Aeration Rate and 40% immobilized system. Under these conditions, the volumetric productivity was 0.21 g l −1 h −1 .
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influence of Aeration Rate and carrier concentration on xylitol production from sugarcane bagasse hydrolyzate in immobilized cell fluidized bed reactor
Process Biochemistry, 2005Co-Authors: Julio Dos C Santos, Solange I. Mussatto, Attilio Converti, Walter Carvalho, Silvio Silvério Da SilvaAbstract:Abstract A new approach to the biotechnological production of xylitol from sugarcane bagasse using Candida guilliermondii cells immobilized on porous glass in a fluidized bed reactor (FBR) is presented. The influence of Aeration Rate (AR) and carrier concentration ( C s ) on the production process was evaluated. Seven batch fermentation runs were conducted according to a 2 2 factorial design. The results obtained showed that C s had a negative influence on xylitol yield ( Y p/s ) and volumetric productivity ( Q p ), whereas AR had a positive influence on Q p and a negative influence on Y p/s . With an AR=0.093 min −1 and C s =62.5 g/l, the Y p/s value was low (0.25 g/g), but the Q p was highest (0.44 g/l h), probably because cell metabolism was faster when more oxygen was available to the yeast. When the highest levels of the AR and C s were used, the xylitol yield and concentration were the lowest and the cell concentration was the highest, suggesting that cell metabolism was directed preferentially towards biomass production instead of xylitol accumulation.
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maximizing the xylitol production from sugar cane bagasse hydrolysate by controlling the Aeration Rate
Applied Biochemistry and Biotechnology, 1997Co-Authors: Silvio Silvério Da Silva, Joao D Ribeiro, Maria Das Gracas De Almeida Felipe, Michelle VitoloAbstract:Batch fermentations of sugar cane bagasse hemicellulosic hydrolysate treated for removing the inhibitors of the fermentation were performed by Candida guilliermondii FTI 20037 for xylitol production. The fermentative parameters agitation and Aeration Rate were studied aiming the maximization of xylitol production from this agroindustrial residue. The maximal xylitol volumetric productivity (0.87 g/L·h) and yield (0.67 g/g) were attained at 400/min and 0.45 v.v.m. (KLa 27/h). According to the results, a suitable control of the oxygen input permitting the xylitol formation from sugar cane bagasse hydrolysate is required for the development of an efficient fermentation process for large-scale applications.
Murat Topal - One of the best experts on this subject based on the ideXlab platform.
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determination of the effect of Aeration Rate on composting of vegetable fruit wastes
Clean-soil Air Water, 2011Co-Authors: Isil E Arslan, Ayhan Ünlü, Murat TopalAbstract:In this study, it was aimed to determine the effect of various Aeration Rates on composting to supply the optimum Aeration Rate for a successful and economic composting. For this aim, vegetable–fruit wastes (VFW) were composted at various Aeration Rates (0.37, 0.49, 0.62, 0.74, 0.86, and 0.99 L/min kg VS) and moisture, temperature, pH, electrical conductivity, C/N, and cellulose were investigated. Moistures of the reactor that had the highest Aeration were generally lower than those of the others. Reactor that had the lowest Aeration reached thermophilic phase earlier than the others and stayed more days. This situation was opposite for the reactor that had the highest Aeration. pH variations with Aeration Rates were not significant. Although electrical conductivity did not differ significantly with Aeration Rates, at the beginning of the thermophilic phase it generally increased with the increase in Aeration. The highest C/N reduction was observed in the reactor that had an Aeration of 0.62 L/min kg VS. The final cellulose contents were close to each other. It could be said that Aeration Rates used were efficient on composting of VFW. Taking the C/N into account which is the parameter of the indicator of the stabilization in composting, it could be said that the optimum Aeration Rate for forced aerobic composting of VFW was 0.62 L/min kg VS.
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Determination of the Effect of Aeration Rate on Composting of Vegetable–Fruit Wastes
CLEAN - Soil Air Water, 2011Co-Authors: E. Işıl Arslan, Ayhan Ünlü, Murat TopalAbstract:In this study, it was aimed to determine the effect of various Aeration Rates on composting to supply the optimum Aeration Rate for a successful and economic composting. For this aim, vegetable–fruit wastes (VFW) were composted at various Aeration Rates (0.37, 0.49, 0.62, 0.74, 0.86, and 0.99 L/min kg VS) and moisture, temperature, pH, electrical conductivity, C/N, and cellulose were investigated. Moistures of the reactor that had the highest Aeration were generally lower than those of the others. Reactor that had the lowest Aeration reached thermophilic phase earlier than the others and stayed more days. This situation was opposite for the reactor that had the highest Aeration. pH variations with Aeration Rates were not significant. Although electrical conductivity did not differ significantly with Aeration Rates, at the beginning of the thermophilic phase it generally increased with the increase in Aeration. The highest C/N reduction was observed in the reactor that had an Aeration of 0.62 L/min kg VS. The final cellulose contents were close to each other. It could be said that Aeration Rates used were efficient on composting of VFW. Taking the C/N into account which is the parameter of the indicator of the stabilization in composting, it could be said that the optimum Aeration Rate for forced aerobic composting of VFW was 0.62 L/min kg VS.
Ayhan Ünlü - One of the best experts on this subject based on the ideXlab platform.
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determination of the effect of Aeration Rate on composting of vegetable fruit wastes
Clean-soil Air Water, 2011Co-Authors: Isil E Arslan, Ayhan Ünlü, Murat TopalAbstract:In this study, it was aimed to determine the effect of various Aeration Rates on composting to supply the optimum Aeration Rate for a successful and economic composting. For this aim, vegetable–fruit wastes (VFW) were composted at various Aeration Rates (0.37, 0.49, 0.62, 0.74, 0.86, and 0.99 L/min kg VS) and moisture, temperature, pH, electrical conductivity, C/N, and cellulose were investigated. Moistures of the reactor that had the highest Aeration were generally lower than those of the others. Reactor that had the lowest Aeration reached thermophilic phase earlier than the others and stayed more days. This situation was opposite for the reactor that had the highest Aeration. pH variations with Aeration Rates were not significant. Although electrical conductivity did not differ significantly with Aeration Rates, at the beginning of the thermophilic phase it generally increased with the increase in Aeration. The highest C/N reduction was observed in the reactor that had an Aeration of 0.62 L/min kg VS. The final cellulose contents were close to each other. It could be said that Aeration Rates used were efficient on composting of VFW. Taking the C/N into account which is the parameter of the indicator of the stabilization in composting, it could be said that the optimum Aeration Rate for forced aerobic composting of VFW was 0.62 L/min kg VS.
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Determination of the Effect of Aeration Rate on Composting of Vegetable–Fruit Wastes
CLEAN - Soil Air Water, 2011Co-Authors: E. Işıl Arslan, Ayhan Ünlü, Murat TopalAbstract:In this study, it was aimed to determine the effect of various Aeration Rates on composting to supply the optimum Aeration Rate for a successful and economic composting. For this aim, vegetable–fruit wastes (VFW) were composted at various Aeration Rates (0.37, 0.49, 0.62, 0.74, 0.86, and 0.99 L/min kg VS) and moisture, temperature, pH, electrical conductivity, C/N, and cellulose were investigated. Moistures of the reactor that had the highest Aeration were generally lower than those of the others. Reactor that had the lowest Aeration reached thermophilic phase earlier than the others and stayed more days. This situation was opposite for the reactor that had the highest Aeration. pH variations with Aeration Rates were not significant. Although electrical conductivity did not differ significantly with Aeration Rates, at the beginning of the thermophilic phase it generally increased with the increase in Aeration. The highest C/N reduction was observed in the reactor that had an Aeration of 0.62 L/min kg VS. The final cellulose contents were close to each other. It could be said that Aeration Rates used were efficient on composting of VFW. Taking the C/N into account which is the parameter of the indicator of the stabilization in composting, it could be said that the optimum Aeration Rate for forced aerobic composting of VFW was 0.62 L/min kg VS.
Reza Yegani - One of the best experts on this subject based on the ideXlab platform.
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investigation of antifouling properties of polypropylene tio2 nanocomposite membrane under different Aeration Rate in membrane bioreactor system
Biotechnology Reports, 2020Co-Authors: Habib Etemadi, Milad Fonouni, Reza YeganiAbstract:Abstract This paper presents the results of Aeration Rate effect on antifouling properties of polypropylene (PP)/TiO2 nanocomposite membrane in membrane bioreactor (MBR) system in order to oil refinery wastewater treatment. For this purpose, three levels of Aeration Rate with specific Aeration demand per membrane area (SADm) of 0.5, 1, and 1.5 m3/m2h was used. According to the obtained results, PP nanocomposite membrane showed high hydrophilicity, porosity, and high flux compared to neat PP membrane. Also, either low or high Aeration Rate had a negative influence on permeability and antifouling properties of neat PP and nanocomposite membranes. The analysis of fouling mechanism for both membranes based on Hermia’s model revealed that the cake formation is dominant mechanism for lower Aeration Rate while by increasing Aeration Rate, all models couldn’t predict experimental data. Meanwhile, by increasing Aeration Rate, chemical oxygen demand (COD) removal for activated sludge and both membranes decreased and increased, respectively.
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Investigation of antifouling properties of polypropylene/TiO2 nanocomposite membrane under different Aeration Rate in membrane bioreactor system.
Biotechnology reports (Amsterdam Netherlands), 2019Co-Authors: Habib Etemadi, Milad Fonouni, Reza YeganiAbstract:Abstract This paper presents the results of Aeration Rate effect on antifouling properties of polypropylene (PP)/TiO2 nanocomposite membrane in membrane bioreactor (MBR) system in order to oil refinery wastewater treatment. For this purpose, three levels of Aeration Rate with specific Aeration demand per membrane area (SADm) of 0.5, 1, and 1.5 m3/m2h was used. According to the obtained results, PP nanocomposite membrane showed high hydrophilicity, porosity, and high flux compared to neat PP membrane. Also, either low or high Aeration Rate had a negative influence on permeability and antifouling properties of neat PP and nanocomposite membranes. The analysis of fouling mechanism for both membranes based on Hermia’s model revealed that the cake formation is dominant mechanism for lower Aeration Rate while by increasing Aeration Rate, all models couldn’t predict experimental data. Meanwhile, by increasing Aeration Rate, chemical oxygen demand (COD) removal for activated sludge and both membranes decreased and increased, respectively.
Mathieu Sperandio - One of the best experts on this subject based on the ideXlab platform.
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alternating anoxic feast aerobic famine condition for improving granular sludge formation in sequencing batch airlift reactor at reduced Aeration Rate
Water Research, 2009Co-Authors: Junfeng Wan, Yolaine Bessiere, Mathieu SperandioAbstract:Abstract In this study the influence of a pre-anoxic feast period on granular sludge formation in a sequencing batch airlift reactor is evaluated. Whereas a purely aerobic SBR was opeRated as a reference (reactor R2), another reactor (R1) was run with a reduced Aeration Rate and an alternating anoxic-aerobic cycle reinforced by nitRate feeding. The presence of pre-anoxic phase clearly improved the densification of aggregates and allowed granular sludge formation at reduced air flow Rate (superficial air velocity (SAV) = 0.63 cm s −1 ). A low sludge volume index (SVI 30 = 45 mL g −1 ) and a high MLSS concentration (9–10 g L −1 ) were obtained in the anoxic/aerobic system compared to more conventional results for the aerobic reactor. A granular sludge was observed in the anoxic/aerobic system whilst only flocs were observed in the aerobic reference even when opeRated at a high Aeration Rate (SAV = 2.83 cm s −1 ). Nitrification was maintained efficiently in the anoxic/aerobic system even when organic loading Rate (OLR) was increased up to 2.8 kg COD m −3 d −1 . In the contrary nitrification was unstable in the aerobic system and dropped at high OLR due to competition between autotrophic and heterotrophic growth. The presence of a pre-anoxic period positively affected granulation process via different mechanisms: enhancing heterotrophic growth/storage deeper in the internal anoxic layer of granule, reducing the competition between autotrophic and heterotrophic growth. These processes help to develop dense granular sludge at a modeRate Aeration Rate. This tends to confirm that oxygen transfer is the most limiting factor for granulation at reduced Aeration. Hence the use of an alternative electron acceptor (nitRate or nitrite) should be encouraged during feast period for reducing energy demand of the granular sludge process.
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Alternating anoxic feast/aerobic famine condition for improving granular sludge formation in sequencing batch airlift reactor at reduced Aeration Rate
Water Research, 2009Co-Authors: Junfeng Wan, Yolaine Bessiere, Mathieu SperandioAbstract:In this study the influence of a pre-anoxic feast period on granular sludge formation in a sequencing batch airlift reactor is evaluated. Whereas a purely aerobic SBR was opeRated as a reference (reactor R2), another reactor (R1) was run with a reduced Aeration Rate and an alternating anoxic-aerobic cycle reinforced by nitRate feeding. The presence of pre-anoxic phase clearly improved the densification of aggregates and allowed granular sludge formation at reduced air flow Rate (superficial air velocity (SAV) = 0.63 cm s−1). A low sludge volume index (SVI30 = 45 mL g−1) and a high MLSS concentration (9–10 g L−1) were obtained in the anoxic/aerobic system compared to more conventional results for the aerobic reactor. A granular sludge was observed in the anoxic/aerobic system whilst only flocs were observed in the aerobic reference even when opeRated at a high Aeration Rate (SAV = 2.83 cm s−1). Nitrification was maintained efficiently in the anoxic/aerobic system even when organic loading Rate (OLR) was increased up to 2.8 kg COD m−3 d−1. In the contrary nitrification was unstable in the aerobic system and dropped at high OLR due to competition between autotrophic and heterotrophic growth. The presence of a pre-anoxic period positively affected granulation process via different mechanisms: enhancing heterotrophic growth/storage deeper in the internal anoxic layer of granule, reducing the competition between autotrophic and heterotrophic growth. These processes help to develop dense granular sludge at a modeRate Aeration Rate. This tends to confirm that oxygen transfer is the most limiting factor for granulation at reduced Aeration. Hence the use of an alternative electron acceptor (nitRate or nitrite) should be encouraged during feast period for reducing energy demand of the granular sludge process.
