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Hana Gannoun - One of the best experts on this subject based on the ideXlab platform.

  • microbial monitoring by molecular tools of an upflow Anaerobic Filter treating abattoir wastewaters
    Bioresource Technology, 2013
    Co-Authors: Hana Gannoun, Eltaief Khelifi, Ilhem Omri, Linda Jabari, Marie-laure Fardeau, Hassib Bouallagui, Jean-jacques Godon, Moktar Hamdi
    Abstract:

    Abstract The performance of Anaerobic digestion of abattoir wastewaters (AW) in an upflow Anaerobic Filter (UAF) was investigated under mesophilic (37 °C) and thermophilic (55 °C) conditions. The effects of increasing temperature on the performance of the UAF and on the dynamics of the microbial community of the Anaerobic sludge were studied. The results showed that chemical oxygen demand (COD) removal efficiency of 90% was achieved for organic loading rates (OLRs) up to 4.5 g COD L −1  d −1 in mesophilic conditions, while in thermophilic conditions, the highest OLRs of 9 g COD L −1  d −1 led to the efficiency of 72%. The use of molecular and microbiological methods to recover microbial populations involved in this process showed that fermentative bacteria were the prominent members of the sludge microbial community. Three novel strains were identified as Macellibacteroides fermentans , Desulfotomaculum peckii and Defluviitalea saccharophila .

  • Microbial monitoring by molecular tools of an upflow Anaerobic Filter treating abattoir wastewaters
    Bioresource Technology, 2013
    Co-Authors: Hana Gannoun, Eltaief Khelifi, Ilhem Omri, Linda Jabari, Marie-laure Fardeau, Hassib Bouallagui, Jean-jacques Godon, Moktar Hamdi
    Abstract:

    The performance of Anaerobic digestion of abattoir wastewaters (AW) in an upflow Anaerobic Filter (UAF) was investigated under mesophilic (37 degrees C) and thermophilic (55 degrees C) conditions. The effects of increasing temperature on the performance of the UAF and on the dynamics of the microbial community of the Anaerobic sludge were studied. The results showed that chemical oxygen demand (COD) removal efficiency of 90% was achieved for organic loading rates (OLRs) up to 4.5 g COD L-1 d(-1) in mesophilic conditions, while in thermophilic conditions, the highest OLRs of 9 g COD L-1 d(-1) led to the efficiency of 72%. The use of molecular and microbiological methods to recover microbial populations involved in this process showed that fermentative bacteria were the prominent members of the sludge microbial community. Three novel strains were identified as Macellibacteroides fermentans, Desulfotomaculum peckii and Defluviitalea saccharophila.

  • ecological clarification of cheese whey prior to Anaerobic digestion in upflow Anaerobic Filter
    Bioresource Technology, 2008
    Co-Authors: Hana Gannoun, Eltaief Khelifi, Hassib Bouallagui, Youssef Touhami, Moktar Hamdi
    Abstract:

    Abstract Anaerobic digestion of cheese whey wastewaters (CW) was investigated in a system consisting of an ecological pretreatment followed by upflow Anaerobic Filter (UAF). The pretreatment was conducted to solve the inhibition problems during Anaerobic treatment of CW caused by the amounts of fats, proteins and carbohydrates and to avoid the major problems of clogging in the reactor. The optimized ecological pretreatment of diluted CW induce removal yields of 50% of chemical oxygen demand (COD) and 60% of total suspended solids (TSS) after acidification by Lactobacillus paracasei at 32 °C during 20 h and neutralization with lime. The pretreated CW was used to feed UAF (35 °C). The effects of organic loading rate (OLR) and hydraulic retention time (HRT) on the pretreated CW Anaerobic degradation were examined. The average total COD removals achieved was 80–90%. The performance of the reactor was depressed by increasing the COD concentration to 20 g/l (OLR = 4 g COD/l d) and the COD removal efficiency was reduced to 72%. Significant methane yield (280 l/kg COD removal) was obtained at an HRT of 2 days.

  • mesophilic and thermophilic Anaerobic co digestion of olive mill wastewaters and abattoir wastewaters in an upflow Anaerobic Filter
    Industrial & Engineering Chemistry Research, 2007
    Co-Authors: Hana Gannoun, Hassib Bouallagui, Nada Ben Othman, Hamdi Moktar
    Abstract:

    The mixture of olive mill wastewater (OMW) with abattoir wastewater (AW) induced the precipitation of OMW phenolic compounds with AW proteins and the removal of chemical oxygen demand (COD). Anaerobic batch experiments with different proportions of OMW:AW (v:v) (10:90; 20:80; 40:60; 60:40) showed that the 40:60 mixture can be co-digested in a continuous system because it improves the C/N ratio and reduces the inhibition of methanogenic bacteria by phenolic compounds. The continuous co-digestion of this mixture was tested under mesophilic (37 °C) and thermophilic (55 °C) conditions using an upflow Anaerobic Filter (UAF). The organic loading rates (OLRs) which could be achieved during the co-digestion were higher than those obtained during the Anaerobic treatment of OMW alone. The change from a mesophilic to a thermophilic environment in the UAF was carried out with a short start-up of thermophilic condition. A higher discoloration, higher COD removal (80%), and biogas yield (0.52 L/g of COD removal) were o...

Moktar Hamdi - One of the best experts on this subject based on the ideXlab platform.

  • microbial monitoring by molecular tools of an upflow Anaerobic Filter treating abattoir wastewaters
    Bioresource Technology, 2013
    Co-Authors: Hana Gannoun, Eltaief Khelifi, Ilhem Omri, Linda Jabari, Marie-laure Fardeau, Hassib Bouallagui, Jean-jacques Godon, Moktar Hamdi
    Abstract:

    Abstract The performance of Anaerobic digestion of abattoir wastewaters (AW) in an upflow Anaerobic Filter (UAF) was investigated under mesophilic (37 °C) and thermophilic (55 °C) conditions. The effects of increasing temperature on the performance of the UAF and on the dynamics of the microbial community of the Anaerobic sludge were studied. The results showed that chemical oxygen demand (COD) removal efficiency of 90% was achieved for organic loading rates (OLRs) up to 4.5 g COD L −1  d −1 in mesophilic conditions, while in thermophilic conditions, the highest OLRs of 9 g COD L −1  d −1 led to the efficiency of 72%. The use of molecular and microbiological methods to recover microbial populations involved in this process showed that fermentative bacteria were the prominent members of the sludge microbial community. Three novel strains were identified as Macellibacteroides fermentans , Desulfotomaculum peckii and Defluviitalea saccharophila .

  • Microbial monitoring by molecular tools of an upflow Anaerobic Filter treating abattoir wastewaters
    Bioresource Technology, 2013
    Co-Authors: Hana Gannoun, Eltaief Khelifi, Ilhem Omri, Linda Jabari, Marie-laure Fardeau, Hassib Bouallagui, Jean-jacques Godon, Moktar Hamdi
    Abstract:

    The performance of Anaerobic digestion of abattoir wastewaters (AW) in an upflow Anaerobic Filter (UAF) was investigated under mesophilic (37 degrees C) and thermophilic (55 degrees C) conditions. The effects of increasing temperature on the performance of the UAF and on the dynamics of the microbial community of the Anaerobic sludge were studied. The results showed that chemical oxygen demand (COD) removal efficiency of 90% was achieved for organic loading rates (OLRs) up to 4.5 g COD L-1 d(-1) in mesophilic conditions, while in thermophilic conditions, the highest OLRs of 9 g COD L-1 d(-1) led to the efficiency of 72%. The use of molecular and microbiological methods to recover microbial populations involved in this process showed that fermentative bacteria were the prominent members of the sludge microbial community. Three novel strains were identified as Macellibacteroides fermentans, Desulfotomaculum peckii and Defluviitalea saccharophila.

  • ecological clarification of cheese whey prior to Anaerobic digestion in upflow Anaerobic Filter
    Bioresource Technology, 2008
    Co-Authors: Hana Gannoun, Eltaief Khelifi, Hassib Bouallagui, Youssef Touhami, Moktar Hamdi
    Abstract:

    Abstract Anaerobic digestion of cheese whey wastewaters (CW) was investigated in a system consisting of an ecological pretreatment followed by upflow Anaerobic Filter (UAF). The pretreatment was conducted to solve the inhibition problems during Anaerobic treatment of CW caused by the amounts of fats, proteins and carbohydrates and to avoid the major problems of clogging in the reactor. The optimized ecological pretreatment of diluted CW induce removal yields of 50% of chemical oxygen demand (COD) and 60% of total suspended solids (TSS) after acidification by Lactobacillus paracasei at 32 °C during 20 h and neutralization with lime. The pretreated CW was used to feed UAF (35 °C). The effects of organic loading rate (OLR) and hydraulic retention time (HRT) on the pretreated CW Anaerobic degradation were examined. The average total COD removals achieved was 80–90%. The performance of the reactor was depressed by increasing the COD concentration to 20 g/l (OLR = 4 g COD/l d) and the COD removal efficiency was reduced to 72%. Significant methane yield (280 l/kg COD removal) was obtained at an HRT of 2 days.

Hassib Bouallagui - One of the best experts on this subject based on the ideXlab platform.

  • microbial monitoring by molecular tools of an upflow Anaerobic Filter treating abattoir wastewaters
    Bioresource Technology, 2013
    Co-Authors: Hana Gannoun, Eltaief Khelifi, Ilhem Omri, Linda Jabari, Marie-laure Fardeau, Hassib Bouallagui, Jean-jacques Godon, Moktar Hamdi
    Abstract:

    Abstract The performance of Anaerobic digestion of abattoir wastewaters (AW) in an upflow Anaerobic Filter (UAF) was investigated under mesophilic (37 °C) and thermophilic (55 °C) conditions. The effects of increasing temperature on the performance of the UAF and on the dynamics of the microbial community of the Anaerobic sludge were studied. The results showed that chemical oxygen demand (COD) removal efficiency of 90% was achieved for organic loading rates (OLRs) up to 4.5 g COD L −1  d −1 in mesophilic conditions, while in thermophilic conditions, the highest OLRs of 9 g COD L −1  d −1 led to the efficiency of 72%. The use of molecular and microbiological methods to recover microbial populations involved in this process showed that fermentative bacteria were the prominent members of the sludge microbial community. Three novel strains were identified as Macellibacteroides fermentans , Desulfotomaculum peckii and Defluviitalea saccharophila .

  • Microbial monitoring by molecular tools of an upflow Anaerobic Filter treating abattoir wastewaters
    Bioresource Technology, 2013
    Co-Authors: Hana Gannoun, Eltaief Khelifi, Ilhem Omri, Linda Jabari, Marie-laure Fardeau, Hassib Bouallagui, Jean-jacques Godon, Moktar Hamdi
    Abstract:

    The performance of Anaerobic digestion of abattoir wastewaters (AW) in an upflow Anaerobic Filter (UAF) was investigated under mesophilic (37 degrees C) and thermophilic (55 degrees C) conditions. The effects of increasing temperature on the performance of the UAF and on the dynamics of the microbial community of the Anaerobic sludge were studied. The results showed that chemical oxygen demand (COD) removal efficiency of 90% was achieved for organic loading rates (OLRs) up to 4.5 g COD L-1 d(-1) in mesophilic conditions, while in thermophilic conditions, the highest OLRs of 9 g COD L-1 d(-1) led to the efficiency of 72%. The use of molecular and microbiological methods to recover microbial populations involved in this process showed that fermentative bacteria were the prominent members of the sludge microbial community. Three novel strains were identified as Macellibacteroides fermentans, Desulfotomaculum peckii and Defluviitalea saccharophila.

  • ecological clarification of cheese whey prior to Anaerobic digestion in upflow Anaerobic Filter
    Bioresource Technology, 2008
    Co-Authors: Hana Gannoun, Eltaief Khelifi, Hassib Bouallagui, Youssef Touhami, Moktar Hamdi
    Abstract:

    Abstract Anaerobic digestion of cheese whey wastewaters (CW) was investigated in a system consisting of an ecological pretreatment followed by upflow Anaerobic Filter (UAF). The pretreatment was conducted to solve the inhibition problems during Anaerobic treatment of CW caused by the amounts of fats, proteins and carbohydrates and to avoid the major problems of clogging in the reactor. The optimized ecological pretreatment of diluted CW induce removal yields of 50% of chemical oxygen demand (COD) and 60% of total suspended solids (TSS) after acidification by Lactobacillus paracasei at 32 °C during 20 h and neutralization with lime. The pretreated CW was used to feed UAF (35 °C). The effects of organic loading rate (OLR) and hydraulic retention time (HRT) on the pretreated CW Anaerobic degradation were examined. The average total COD removals achieved was 80–90%. The performance of the reactor was depressed by increasing the COD concentration to 20 g/l (OLR = 4 g COD/l d) and the COD removal efficiency was reduced to 72%. Significant methane yield (280 l/kg COD removal) was obtained at an HRT of 2 days.

  • mesophilic and thermophilic Anaerobic co digestion of olive mill wastewaters and abattoir wastewaters in an upflow Anaerobic Filter
    Industrial & Engineering Chemistry Research, 2007
    Co-Authors: Hana Gannoun, Hassib Bouallagui, Nada Ben Othman, Hamdi Moktar
    Abstract:

    The mixture of olive mill wastewater (OMW) with abattoir wastewater (AW) induced the precipitation of OMW phenolic compounds with AW proteins and the removal of chemical oxygen demand (COD). Anaerobic batch experiments with different proportions of OMW:AW (v:v) (10:90; 20:80; 40:60; 60:40) showed that the 40:60 mixture can be co-digested in a continuous system because it improves the C/N ratio and reduces the inhibition of methanogenic bacteria by phenolic compounds. The continuous co-digestion of this mixture was tested under mesophilic (37 °C) and thermophilic (55 °C) conditions using an upflow Anaerobic Filter (UAF). The organic loading rates (OLRs) which could be achieved during the co-digestion were higher than those obtained during the Anaerobic treatment of OMW alone. The change from a mesophilic to a thermophilic environment in the UAF was carried out with a short start-up of thermophilic condition. A higher discoloration, higher COD removal (80%), and biogas yield (0.52 L/g of COD removal) were o...

Eltaief Khelifi - One of the best experts on this subject based on the ideXlab platform.

  • microbial monitoring by molecular tools of an upflow Anaerobic Filter treating abattoir wastewaters
    Bioresource Technology, 2013
    Co-Authors: Hana Gannoun, Eltaief Khelifi, Ilhem Omri, Linda Jabari, Marie-laure Fardeau, Hassib Bouallagui, Jean-jacques Godon, Moktar Hamdi
    Abstract:

    Abstract The performance of Anaerobic digestion of abattoir wastewaters (AW) in an upflow Anaerobic Filter (UAF) was investigated under mesophilic (37 °C) and thermophilic (55 °C) conditions. The effects of increasing temperature on the performance of the UAF and on the dynamics of the microbial community of the Anaerobic sludge were studied. The results showed that chemical oxygen demand (COD) removal efficiency of 90% was achieved for organic loading rates (OLRs) up to 4.5 g COD L −1  d −1 in mesophilic conditions, while in thermophilic conditions, the highest OLRs of 9 g COD L −1  d −1 led to the efficiency of 72%. The use of molecular and microbiological methods to recover microbial populations involved in this process showed that fermentative bacteria were the prominent members of the sludge microbial community. Three novel strains were identified as Macellibacteroides fermentans , Desulfotomaculum peckii and Defluviitalea saccharophila .

  • Microbial monitoring by molecular tools of an upflow Anaerobic Filter treating abattoir wastewaters
    Bioresource Technology, 2013
    Co-Authors: Hana Gannoun, Eltaief Khelifi, Ilhem Omri, Linda Jabari, Marie-laure Fardeau, Hassib Bouallagui, Jean-jacques Godon, Moktar Hamdi
    Abstract:

    The performance of Anaerobic digestion of abattoir wastewaters (AW) in an upflow Anaerobic Filter (UAF) was investigated under mesophilic (37 degrees C) and thermophilic (55 degrees C) conditions. The effects of increasing temperature on the performance of the UAF and on the dynamics of the microbial community of the Anaerobic sludge were studied. The results showed that chemical oxygen demand (COD) removal efficiency of 90% was achieved for organic loading rates (OLRs) up to 4.5 g COD L-1 d(-1) in mesophilic conditions, while in thermophilic conditions, the highest OLRs of 9 g COD L-1 d(-1) led to the efficiency of 72%. The use of molecular and microbiological methods to recover microbial populations involved in this process showed that fermentative bacteria were the prominent members of the sludge microbial community. Three novel strains were identified as Macellibacteroides fermentans, Desulfotomaculum peckii and Defluviitalea saccharophila.

  • ecological clarification of cheese whey prior to Anaerobic digestion in upflow Anaerobic Filter
    Bioresource Technology, 2008
    Co-Authors: Hana Gannoun, Eltaief Khelifi, Hassib Bouallagui, Youssef Touhami, Moktar Hamdi
    Abstract:

    Abstract Anaerobic digestion of cheese whey wastewaters (CW) was investigated in a system consisting of an ecological pretreatment followed by upflow Anaerobic Filter (UAF). The pretreatment was conducted to solve the inhibition problems during Anaerobic treatment of CW caused by the amounts of fats, proteins and carbohydrates and to avoid the major problems of clogging in the reactor. The optimized ecological pretreatment of diluted CW induce removal yields of 50% of chemical oxygen demand (COD) and 60% of total suspended solids (TSS) after acidification by Lactobacillus paracasei at 32 °C during 20 h and neutralization with lime. The pretreated CW was used to feed UAF (35 °C). The effects of organic loading rate (OLR) and hydraulic retention time (HRT) on the pretreated CW Anaerobic degradation were examined. The average total COD removals achieved was 80–90%. The performance of the reactor was depressed by increasing the COD concentration to 20 g/l (OLR = 4 g COD/l d) and the COD removal efficiency was reduced to 72%. Significant methane yield (280 l/kg COD removal) was obtained at an HRT of 2 days.

Aline Carvalho Da Costa - One of the best experts on this subject based on the ideXlab platform.

  • Denitrification on upflow-Anaerobic Filter filled with coconut shells (Cocos nucifera)
    Ecological Engineering, 2015
    Co-Authors: Jenifer Clarisse Pereira Da Silva, Adriano Luiz Tonetti, Lays Paulino Leonel, Aline Carvalho Da Costa
    Abstract:

    Abstract This paper studied the denitrification in an upflow-Anaerobic Filter filled with coconut shells (Cocos nucifera). We sought to remove nitrogen in decentralized systems, reducing the diffuse contamination of groundwater and water bodies by nitrate. The upflow-Anaerobic Filter was operated under hydraulic retention time (HRT) of 16 h and on the bottom, there was an inflow of a combination of raw sewage and nitrified effluents from an intermittent sand Filter. The research was divided into 5 stages in which there was an inflow of the following combination of raw sewage and nitrified effluent: Stage 1: 100.0%/0.0%; Stage 2: 87.5%/12.5%; Stage 3: 75.0%/25.0%; Stage 4: 62.5%/37.5%, and Stage 5: 50.0%/50.0%. The upflow-Anaerobic Filter promoted denitrification in all stages with a quick acclimatization of the denitrifying biomass. In the most critical situation (Stage 5), in which there was an inflow of 46.9 mg L−1 of nitrate, a transformation of 98% of such compounds was found. On the effluent, the nitrate concentration obtained did not exceed 1.0 mg L−1. So we found that a simple recirculation of nitrified effluent to Anaerobic Filters can contribute to the reduction of diffuse pollution of nitrate in remote areas of large cities or in rural areas.