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Lutgarde Raskin - One of the best experts on this subject based on the ideXlab platform.

  • Microbial Population Dynamics during start up and overload conditions of anaerobic digesters treating municipal solid waste and sewage sludge
    Biotechnology and Bioengineering, 2004
    Co-Authors: Katherine D Mcmahon, Roderick I Mackie, Alfons J M Stams, Dandan Zheng, Lutgarde Raskin
    Abstract:

    Microbial Population Dynamics were investigated during start-up and during periods of overload conditions in anaerobic co-digesters treating municipal solid waste and sewage sludge. Changes in community structure were monitored using ribosomal RNA-based oligonucleotide probe hybridization to measure the abundance of syntrophic propionate-oxidizing bacteria (SPOB), saturated fatty acid-beta-oxidizing syntrophs (SFAS), and methanogens. These changes were linked to traditional performance parameters such as biogas production and volatile fatty acid (VFA) concentrations. Digesters with high levels of Archaea started up successfully. Methanosaeta concilii was the dominant aceticlastic methanogen in these systems. In contrast, digesters that experienced a difficult start-up period had lower levels of Archaea with proportionally more abundant Methanosarcina spp. Syntrophic propionate-oxidizing bacteria and saturated fatty acid-beta-oxidizing syntrophs were present at low levels in all digesters, and SPOB appeared to play a role in stabilizing propionate levels during start-up of one digester. Digesters with a history of poor performance tolerated a severe organic overload event better than digesters that had previously performed well. It is hypothesized that higher levels of SPOB and SFAS and their methanogenic partners in previously unstable digesters are responsible for this behavior. (C) 2004 Wiley Periodicals, Inc.

  • Microbial Population Dynamics during start up and overload conditions of anaerobic digesters treating municipal solid waste and sewage sludge
    Biotechnology and Bioengineering, 2004
    Co-Authors: Katherine D Mcmahon, Roderick I Mackie, Alfons J M Stams, Dandan Zheng, Lutgarde Raskin
    Abstract:

    Microbial Population Dynamics were investigated during start-up and during periods of overload conditions in anaerobic co-digesters treating municipal solid waste and sewage sludge. Changes in community structure were monitored using ribosomal RNA-based oligonucleotide probe hybridization to measure the abundance of syntrophic propionate-oxidizing bacteria (SPOB), saturated fatty acid-beta-oxidizing syntrophs (SFAS), and methanogens. These changes were linked to traditional performance parameters such as biogas production and volatile fatty acid (VFA) concentrations. Digesters with high levels of Archaea started up successfully. Methanosaeta concilii was the dominant aceticlastic methanogen in these systems. In contrast, digesters that experienced a difficult start-up period had lower levels of Archaea with proportionally more abundant Methanosarcina spp. Syntrophic propionate-oxidizing bacteria and saturated fatty acid-beta-oxidizing syntrophs were present at low levels in all digesters, and SPOB appeared to play a role in stabilizing propionate levels during start-up of one digester. Digesters with a history of poor performance tolerated a severe organic overload event better than digesters that had previously performed well. It is hypothesized that higher levels of SPOB and SFAS and their methanogenic partners in previously unstable digesters are responsible for this behavior.

  • anaerobic codigestion of municipal solid waste and biosolids under various mixing conditions ii Microbial Population Dynamics
    Water Research, 2001
    Co-Authors: Katherine D Mcmahon, Roderick I Mackie, Peter G Stroot, Lutgarde Raskin
    Abstract:

    Microbial Population Dynamics were evaluated in anaerobic codigesters treating municipal solid waste and sewage sludge. Ribosomal RNA based oligonucleotide probes were used to characterize changes in Population abundance of syntrophic volatile fatty acid degrading bacteria and methanogens. Changes in community structure were linked to traditional performance parameters during the recovery of previously unstable codigesters induced by a reduction in mixing levels. Methanosarcina spp. were the most abundant aceticlastic methanogens in unstable codigesters with high acetate concentrations, while Methanosaeta concilii was dominant in stable systems with low levels of acetate. Growth of Syntrophobacter wolinii was enhanced during stabilization of a codigester with a well-developed Population of Methanobacteriaceae, possibly because the presence of adequate numbers of these hydrogenotrophic methanogens encouraged the syntrophic oxidation of propionate. Mesophilic saturated fatty acid beta-oxidizing syntrophs were most abundant in previously unstable codigesters. One minimally mixed reactor became unstable after switching to continuously mixed conditions. After the switch, total archaeal abundance decreased sharply, though Methanobacteriaceae and Methanosarcina spp. levels increased as the fermentation became unbalanced. Based on the results presented here, mixing appears to inhibit the syntrophic oxidation of volatile fatty acids, possibly by disrupting the spatial juxtaposition of syntrophic bacteria and their methanogenic partners.

Katherine D Mcmahon - One of the best experts on this subject based on the ideXlab platform.

  • Microbial Population Dynamics during start up and overload conditions of anaerobic digesters treating municipal solid waste and sewage sludge
    Biotechnology and Bioengineering, 2004
    Co-Authors: Katherine D Mcmahon, Roderick I Mackie, Alfons J M Stams, Dandan Zheng, Lutgarde Raskin
    Abstract:

    Microbial Population Dynamics were investigated during start-up and during periods of overload conditions in anaerobic co-digesters treating municipal solid waste and sewage sludge. Changes in community structure were monitored using ribosomal RNA-based oligonucleotide probe hybridization to measure the abundance of syntrophic propionate-oxidizing bacteria (SPOB), saturated fatty acid-beta-oxidizing syntrophs (SFAS), and methanogens. These changes were linked to traditional performance parameters such as biogas production and volatile fatty acid (VFA) concentrations. Digesters with high levels of Archaea started up successfully. Methanosaeta concilii was the dominant aceticlastic methanogen in these systems. In contrast, digesters that experienced a difficult start-up period had lower levels of Archaea with proportionally more abundant Methanosarcina spp. Syntrophic propionate-oxidizing bacteria and saturated fatty acid-beta-oxidizing syntrophs were present at low levels in all digesters, and SPOB appeared to play a role in stabilizing propionate levels during start-up of one digester. Digesters with a history of poor performance tolerated a severe organic overload event better than digesters that had previously performed well. It is hypothesized that higher levels of SPOB and SFAS and their methanogenic partners in previously unstable digesters are responsible for this behavior. (C) 2004 Wiley Periodicals, Inc.

  • Microbial Population Dynamics during start up and overload conditions of anaerobic digesters treating municipal solid waste and sewage sludge
    Biotechnology and Bioengineering, 2004
    Co-Authors: Katherine D Mcmahon, Roderick I Mackie, Alfons J M Stams, Dandan Zheng, Lutgarde Raskin
    Abstract:

    Microbial Population Dynamics were investigated during start-up and during periods of overload conditions in anaerobic co-digesters treating municipal solid waste and sewage sludge. Changes in community structure were monitored using ribosomal RNA-based oligonucleotide probe hybridization to measure the abundance of syntrophic propionate-oxidizing bacteria (SPOB), saturated fatty acid-beta-oxidizing syntrophs (SFAS), and methanogens. These changes were linked to traditional performance parameters such as biogas production and volatile fatty acid (VFA) concentrations. Digesters with high levels of Archaea started up successfully. Methanosaeta concilii was the dominant aceticlastic methanogen in these systems. In contrast, digesters that experienced a difficult start-up period had lower levels of Archaea with proportionally more abundant Methanosarcina spp. Syntrophic propionate-oxidizing bacteria and saturated fatty acid-beta-oxidizing syntrophs were present at low levels in all digesters, and SPOB appeared to play a role in stabilizing propionate levels during start-up of one digester. Digesters with a history of poor performance tolerated a severe organic overload event better than digesters that had previously performed well. It is hypothesized that higher levels of SPOB and SFAS and their methanogenic partners in previously unstable digesters are responsible for this behavior.

  • anaerobic codigestion of municipal solid waste and biosolids under various mixing conditions ii Microbial Population Dynamics
    Water Research, 2001
    Co-Authors: Katherine D Mcmahon, Roderick I Mackie, Peter G Stroot, Lutgarde Raskin
    Abstract:

    Microbial Population Dynamics were evaluated in anaerobic codigesters treating municipal solid waste and sewage sludge. Ribosomal RNA based oligonucleotide probes were used to characterize changes in Population abundance of syntrophic volatile fatty acid degrading bacteria and methanogens. Changes in community structure were linked to traditional performance parameters during the recovery of previously unstable codigesters induced by a reduction in mixing levels. Methanosarcina spp. were the most abundant aceticlastic methanogens in unstable codigesters with high acetate concentrations, while Methanosaeta concilii was dominant in stable systems with low levels of acetate. Growth of Syntrophobacter wolinii was enhanced during stabilization of a codigester with a well-developed Population of Methanobacteriaceae, possibly because the presence of adequate numbers of these hydrogenotrophic methanogens encouraged the syntrophic oxidation of propionate. Mesophilic saturated fatty acid beta-oxidizing syntrophs were most abundant in previously unstable codigesters. One minimally mixed reactor became unstable after switching to continuously mixed conditions. After the switch, total archaeal abundance decreased sharply, though Methanobacteriaceae and Methanosarcina spp. levels increased as the fermentation became unbalanced. Based on the results presented here, mixing appears to inhibit the syntrophic oxidation of volatile fatty acids, possibly by disrupting the spatial juxtaposition of syntrophic bacteria and their methanogenic partners.

Roderick I Mackie - One of the best experts on this subject based on the ideXlab platform.

  • Microbial Population Dynamics during start up and overload conditions of anaerobic digesters treating municipal solid waste and sewage sludge
    Biotechnology and Bioengineering, 2004
    Co-Authors: Katherine D Mcmahon, Roderick I Mackie, Alfons J M Stams, Dandan Zheng, Lutgarde Raskin
    Abstract:

    Microbial Population Dynamics were investigated during start-up and during periods of overload conditions in anaerobic co-digesters treating municipal solid waste and sewage sludge. Changes in community structure were monitored using ribosomal RNA-based oligonucleotide probe hybridization to measure the abundance of syntrophic propionate-oxidizing bacteria (SPOB), saturated fatty acid-beta-oxidizing syntrophs (SFAS), and methanogens. These changes were linked to traditional performance parameters such as biogas production and volatile fatty acid (VFA) concentrations. Digesters with high levels of Archaea started up successfully. Methanosaeta concilii was the dominant aceticlastic methanogen in these systems. In contrast, digesters that experienced a difficult start-up period had lower levels of Archaea with proportionally more abundant Methanosarcina spp. Syntrophic propionate-oxidizing bacteria and saturated fatty acid-beta-oxidizing syntrophs were present at low levels in all digesters, and SPOB appeared to play a role in stabilizing propionate levels during start-up of one digester. Digesters with a history of poor performance tolerated a severe organic overload event better than digesters that had previously performed well. It is hypothesized that higher levels of SPOB and SFAS and their methanogenic partners in previously unstable digesters are responsible for this behavior. (C) 2004 Wiley Periodicals, Inc.

  • Microbial Population Dynamics during start up and overload conditions of anaerobic digesters treating municipal solid waste and sewage sludge
    Biotechnology and Bioengineering, 2004
    Co-Authors: Katherine D Mcmahon, Roderick I Mackie, Alfons J M Stams, Dandan Zheng, Lutgarde Raskin
    Abstract:

    Microbial Population Dynamics were investigated during start-up and during periods of overload conditions in anaerobic co-digesters treating municipal solid waste and sewage sludge. Changes in community structure were monitored using ribosomal RNA-based oligonucleotide probe hybridization to measure the abundance of syntrophic propionate-oxidizing bacteria (SPOB), saturated fatty acid-beta-oxidizing syntrophs (SFAS), and methanogens. These changes were linked to traditional performance parameters such as biogas production and volatile fatty acid (VFA) concentrations. Digesters with high levels of Archaea started up successfully. Methanosaeta concilii was the dominant aceticlastic methanogen in these systems. In contrast, digesters that experienced a difficult start-up period had lower levels of Archaea with proportionally more abundant Methanosarcina spp. Syntrophic propionate-oxidizing bacteria and saturated fatty acid-beta-oxidizing syntrophs were present at low levels in all digesters, and SPOB appeared to play a role in stabilizing propionate levels during start-up of one digester. Digesters with a history of poor performance tolerated a severe organic overload event better than digesters that had previously performed well. It is hypothesized that higher levels of SPOB and SFAS and their methanogenic partners in previously unstable digesters are responsible for this behavior.

  • anaerobic codigestion of municipal solid waste and biosolids under various mixing conditions ii Microbial Population Dynamics
    Water Research, 2001
    Co-Authors: Katherine D Mcmahon, Roderick I Mackie, Peter G Stroot, Lutgarde Raskin
    Abstract:

    Microbial Population Dynamics were evaluated in anaerobic codigesters treating municipal solid waste and sewage sludge. Ribosomal RNA based oligonucleotide probes were used to characterize changes in Population abundance of syntrophic volatile fatty acid degrading bacteria and methanogens. Changes in community structure were linked to traditional performance parameters during the recovery of previously unstable codigesters induced by a reduction in mixing levels. Methanosarcina spp. were the most abundant aceticlastic methanogens in unstable codigesters with high acetate concentrations, while Methanosaeta concilii was dominant in stable systems with low levels of acetate. Growth of Syntrophobacter wolinii was enhanced during stabilization of a codigester with a well-developed Population of Methanobacteriaceae, possibly because the presence of adequate numbers of these hydrogenotrophic methanogens encouraged the syntrophic oxidation of propionate. Mesophilic saturated fatty acid beta-oxidizing syntrophs were most abundant in previously unstable codigesters. One minimally mixed reactor became unstable after switching to continuously mixed conditions. After the switch, total archaeal abundance decreased sharply, though Methanobacteriaceae and Methanosarcina spp. levels increased as the fermentation became unbalanced. Based on the results presented here, mixing appears to inhibit the syntrophic oxidation of volatile fatty acids, possibly by disrupting the spatial juxtaposition of syntrophic bacteria and their methanogenic partners.

Jianzheng Li - One of the best experts on this subject based on the ideXlab platform.

  • performance 5 aminolevulinic acid ala yield and Microbial Population Dynamics in a photobioreactor system treating soybean wastewater effect of hydraulic retention time hrt and organic loading rate olr
    Bioresource Technology, 2016
    Co-Authors: Guangming Zhang, Xiangkun Li, Jie Zhang, Jianzheng Li
    Abstract:

    Abstract Effects of hydraulic retention time (HRT) and influent organic loading rate (OLR) were investigated in a photobioreactor containing PNSB ( Rhodobacter sphaeroides )-chemoheterotrophic bacteria to treat soybean wastewater. Pollutants removal, biomass production and ALA yield in different phases were investigated in together with functional Microbial Population Dynamics. The results showed that proper HRT and OLR increased the photobioreactor performance including pollutants removal, biomass and ALA productions. 89.5% COD, 90.6% TN and 91.2% TP removals were achieved as well as the highest biomass production of 2655 mg/L and ALA yield of 7.40 mg/g-biomass under the optimal HRT of 60 h and OLR of 2.48 g/L/d. In addition, HRT and OLR have important impacts on PNSB and total bacteria Dynamics.

  • performance carotenoids yield and Microbial Population Dynamics in a photobioreactor system treating acidic wastewater effect of hydraulic retention time hrt and organic loading rate olr
    Bioresource Technology, 2016
    Co-Authors: Guangming Zhang, Xiangkun Li, Jie Zhang, Jianzheng Li
    Abstract:

    Abstract Effects of hydraulic retention time (HRT) and influent organic loading rate (OLR) were investigated in a photobioreactor containing PNSB ( Rhodopseudomonas palustris )-chemoheterotrophic bacteria to treat volatile fatty acid wastewater. Pollutants removal, biomass production and carotenoids yield in different phases were investigated in together with functional Microbial Population Dynamics. The results indicated that properly decreasing HRT and increasing OLR improved the nutrient removal performance as well as the biomass and carotenoids productions. 85.7% COD, 89.9% TN and 91.8% TP removals were achieved under the optimal HRT of 48 h and OLR of 2.51 g/L/d. Meanwhile, the highest biomass production and carotenoids yield were 2719.3 mg/L and 3.91 mg/g-biomass respectively. In addition, HRT and OLR have obvious impacts on PNSB and total bacteria Dynamics. Statistical analyses indicated that the COD removal exhibited a positive relationship with OLR, biomass and carotenoids production. PNSB/total bacteria ratio had a positive correlation with the carotenoids yield.

Guangming Zhang - One of the best experts on this subject based on the ideXlab platform.

  • performance 5 aminolevulinic acid ala yield and Microbial Population Dynamics in a photobioreactor system treating soybean wastewater effect of hydraulic retention time hrt and organic loading rate olr
    Bioresource Technology, 2016
    Co-Authors: Guangming Zhang, Xiangkun Li, Jie Zhang, Jianzheng Li
    Abstract:

    Abstract Effects of hydraulic retention time (HRT) and influent organic loading rate (OLR) were investigated in a photobioreactor containing PNSB ( Rhodobacter sphaeroides )-chemoheterotrophic bacteria to treat soybean wastewater. Pollutants removal, biomass production and ALA yield in different phases were investigated in together with functional Microbial Population Dynamics. The results showed that proper HRT and OLR increased the photobioreactor performance including pollutants removal, biomass and ALA productions. 89.5% COD, 90.6% TN and 91.2% TP removals were achieved as well as the highest biomass production of 2655 mg/L and ALA yield of 7.40 mg/g-biomass under the optimal HRT of 60 h and OLR of 2.48 g/L/d. In addition, HRT and OLR have important impacts on PNSB and total bacteria Dynamics.

  • performance carotenoids yield and Microbial Population Dynamics in a photobioreactor system treating acidic wastewater effect of hydraulic retention time hrt and organic loading rate olr
    Bioresource Technology, 2016
    Co-Authors: Guangming Zhang, Xiangkun Li, Jie Zhang, Jianzheng Li
    Abstract:

    Abstract Effects of hydraulic retention time (HRT) and influent organic loading rate (OLR) were investigated in a photobioreactor containing PNSB ( Rhodopseudomonas palustris )-chemoheterotrophic bacteria to treat volatile fatty acid wastewater. Pollutants removal, biomass production and carotenoids yield in different phases were investigated in together with functional Microbial Population Dynamics. The results indicated that properly decreasing HRT and increasing OLR improved the nutrient removal performance as well as the biomass and carotenoids productions. 85.7% COD, 89.9% TN and 91.8% TP removals were achieved under the optimal HRT of 48 h and OLR of 2.51 g/L/d. Meanwhile, the highest biomass production and carotenoids yield were 2719.3 mg/L and 3.91 mg/g-biomass respectively. In addition, HRT and OLR have obvious impacts on PNSB and total bacteria Dynamics. Statistical analyses indicated that the COD removal exhibited a positive relationship with OLR, biomass and carotenoids production. PNSB/total bacteria ratio had a positive correlation with the carotenoids yield.