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Effect of the concentration of suspended solids on the enzymatic activities and biodiversity of a submerged membrane bioreactor for aerobic treatment of domestic wastewater

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Abstract
A pilot-scale submerged membrane bioreactor was used for the treatment of domestic wastewater in order to study the influence of the variations in the concentration of volatile suspended solids (VSS) on the enzymatic activities (acid and alkaline phosphatases, glucosidase, protease, esterase, and dehydrogenase) and biodiversity of the bacterial community in the sludge. The influence of VSS concentration was evaluated in two separated experiments, which were carried out in two different seasons of the year ( experiment 1 through spring-summer and experiment 2 through autumn-winter). Cluster analysis of the temperature gradient gel electrophoresis (TGGE) profiles demonstrated that the community composition was significantly different in both experiments. Within the same experiment, the bacterial community experienced sequential shifts as the biomass accumulated, as shown by the evolution of the population profiles through time as VSS concentration increased. All enzymatic activities studied were significantly lower during experiment 2, except for glucosidase. Concentrations of VSS over 8 g/l induced a strong descent of all enzymatic activities, which overlapped with a significant modification of the community composition. Sequences of the major TGGE bands were identified as representatives of the Alpha-proteobacteria, filamentous bacteria (Thiotrix), and nitrite oxidizers (Nitrospira). Some sequences which were poorly related to any validated bacterial taxon were obtained.
Keywords
domestic wastewater, submerged membrane bioreactor, wastewater treatment, biodiversity, enzymatic activities, TGGE, 16S RIBOSOMAL-RNA, GRADIENT GEL-ELECTROPHORESIS, ACTIVATED-SLUDGE, COMMUNITY COMPOSITION, AMMONIA, GENES, PCR, BIOMASS, BIODEGRADATION, POPULATIONS

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Chicago
Molina-Muñoz, M, JM Poyatos, Ramiro Vilchez Vargas, E Hontoria, B Rodelas, and J González-López. 2007. “Effect of the Concentration of Suspended Solids on the Enzymatic Activities and Biodiversity of a Submerged Membrane Bioreactor for Aerobic Treatment of Domestic Wastewater.” Applied Microbiology and Biotechnology 73 (6): 1441–1451.
APA
Molina-Muñoz, M., Poyatos, J., Vilchez Vargas, R., Hontoria, E., Rodelas, B., & González-López, J. (2007). Effect of the concentration of suspended solids on the enzymatic activities and biodiversity of a submerged membrane bioreactor for aerobic treatment of domestic wastewater. APPLIED MICROBIOLOGY AND BIOTECHNOLOGY, 73(6), 1441–1451.
Vancouver
1.
Molina-Muñoz M, Poyatos J, Vilchez Vargas R, Hontoria E, Rodelas B, González-López J. Effect of the concentration of suspended solids on the enzymatic activities and biodiversity of a submerged membrane bioreactor for aerobic treatment of domestic wastewater. APPLIED MICROBIOLOGY AND BIOTECHNOLOGY. 2007;73(6):1441–51.
MLA
Molina-Muñoz, M, JM Poyatos, Ramiro Vilchez Vargas, et al. “Effect of the Concentration of Suspended Solids on the Enzymatic Activities and Biodiversity of a Submerged Membrane Bioreactor for Aerobic Treatment of Domestic Wastewater.” APPLIED MICROBIOLOGY AND BIOTECHNOLOGY 73.6 (2007): 1441–1451. Print.
@article{4421206,
  abstract     = {A pilot-scale submerged membrane bioreactor was used for the treatment of domestic wastewater in order to study the influence of the variations in the concentration of volatile suspended solids (VSS) on the enzymatic activities (acid and alkaline phosphatases, glucosidase, protease, esterase, and dehydrogenase) and biodiversity of the bacterial community in the sludge. The influence of VSS concentration was evaluated in two separated experiments, which were carried out in two different seasons of the year ( experiment 1 through spring-summer and experiment 2 through autumn-winter). Cluster analysis of the temperature gradient gel electrophoresis (TGGE) profiles demonstrated that the community composition was significantly different in both experiments. Within the same experiment, the bacterial community experienced sequential shifts as the biomass accumulated, as shown by the evolution of the population profiles through time as VSS concentration increased. All enzymatic activities studied were significantly lower during experiment 2, except for glucosidase. Concentrations of VSS over 8 g/l induced a strong descent of all enzymatic activities, which overlapped with a significant modification of the community composition. Sequences of the major TGGE bands were identified as representatives of the Alpha-proteobacteria, filamentous bacteria (Thiotrix), and nitrite oxidizers (Nitrospira). Some sequences which were poorly related to any validated bacterial taxon were obtained.},
  author       = {Molina-Muñoz, M and Poyatos, JM and Vilchez Vargas, Ramiro and Hontoria, E and Rodelas, B and González-López, J},
  issn         = {0175-7598},
  journal      = {APPLIED MICROBIOLOGY AND BIOTECHNOLOGY},
  keywords     = {domestic wastewater,submerged membrane bioreactor,wastewater treatment,biodiversity,enzymatic activities,TGGE,16S RIBOSOMAL-RNA,GRADIENT GEL-ELECTROPHORESIS,ACTIVATED-SLUDGE,COMMUNITY COMPOSITION,AMMONIA,GENES,PCR,BIOMASS,BIODEGRADATION,POPULATIONS},
  language     = {eng},
  number       = {6},
  pages        = {1441--1451},
  title        = {Effect of the concentration of suspended solids on the enzymatic activities and biodiversity of a submerged membrane bioreactor for aerobic treatment of domestic wastewater},
  url          = {http://dx.doi.org/10.1007/s00253-006-0594-0},
  volume       = {73},
  year         = {2007},
}

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