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Silvio Silvério Da Silva – One of the best experts on this subject based on the ideXlab platform.

  • hemicellulosic ethanol production in fluidized bed reactor from sugar cane bagasse hydrolysate interplay among carrier concentration and Aeration Rate
    ACS Sustainable Chemistry & Engineering, 2017
    Co-Authors: Felipe A F Antunes, Anuj K Chandel, Julio Cesar Dos Santos, Thais S S Milessi, G F D Peres, Silvio Silvério Da Silva

    Abstract:

    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, 2007
    Co-Authors: Ricardo De Freitas Branco, Júlio C. Santos, Lucilene Y. Murakami, Solange I. Mussatto, Giuliano Dragone, Silvio Silvério Da Silva

    Abstract:

    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, 2005
    Co-Authors: Julio Dos C Santos, Solange I. Mussatto, Attilio Converti, Walter Carvalho, Silvio Silvério Da Silva

    Abstract:

    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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Murat Topal – One of the best experts on this subject based on the ideXlab platform.

  • determination of the effect of Aeration Rate on composting of vegetable fruit wastes
    Clean-soil Air Water, 2011
    Co-Authors: Isil E Arslan, Ayhan Ünlü, Murat Topal

    Abstract:

    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, 2011
    Co-Authors: E. Işıl Arslan, Ayhan Ünlü, Murat Topal

    Abstract:

    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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Ayhan Ünlü – One of the best experts on this subject based on the ideXlab platform.

  • determination of the effect of Aeration Rate on composting of vegetable fruit wastes
    Clean-soil Air Water, 2011
    Co-Authors: Isil E Arslan, Ayhan Ünlü, Murat Topal

    Abstract:

    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, 2011
    Co-Authors: E. Işıl Arslan, Ayhan Ünlü, Murat Topal

    Abstract:

    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.

    Free Register to Access Article