scholarly journals Analysis of Microbial Community Dynamics during the Acclimatization Period of a Membrane Bioreactor Treating Table Olive Processing Wastewater

2019 ◽  
Vol 9 (18) ◽  
pp. 3647 ◽  
Author(s):  
Sotiris I. Patsios ◽  
Sofia Michailidou ◽  
Konstantinos Pasentsis ◽  
Antonios M. Makris ◽  
Anagnostis Argiriou ◽  
...  
Keyword(s):  
Microbial Community ◽  
Biological Treatment ◽  
Large Scale ◽  
Membrane Bioreactor ◽  
Community Dynamics ◽  
Metabolic Adaptation ◽  
Process Step ◽  
Microbial Community Dynamics ◽  
Table Olive ◽  
Acclimatization Period

Biological treatment of table olive processing wastewater (TOPW) may be problematic due to its high organic and polyphenolic compound content. Biomass acclimatization is a necessary, yet sensitive, stage for efficient TOPW biological treatment. Next-generation sequencing technologies can provide valuable insights into this critical process step. An aerobic membrane bioreactor (MBR) system, initially inoculated with municipal activated sludge, was acclimatized to treat TOPW. Operational stability and bioremediation efficiency were monitored for approx. three months, whereas microbial community dynamics and metabolic adaptation were assessed through metagenomic and metatranscriptomic analysis. A swift change was identified in both the prokaryotic and eukaryotic bio-community after introduction of TOPW in the MBR, and a new diverse bio-community was established. Thauera and Paracoccus spp. are dominant contributors to the metabolic activity of the stable bio-community, which resulted in over 90% and 85% removal efficiency of total organic carbon and total polyphenols, respectively. This is the first study assessing the microbial community dynamics in a well-defined MBR process treating TOPW, offering guidance in the start-up of large-scale applications.

Microbial community dynamics in a submerged fixed bed bioreactor during biological treatment of saline urban wastewater

2014 ◽  
Vol 71 ◽  
pp. 126-132 ◽  
Author(s):  
C. Cortés-Lorenzo ◽  
D. Sipkema ◽  
M. Rodríguez-Díaz ◽  
S. Fuentes ◽  
B. Juárez-Jiménez ◽  
...  
Keyword(s):  
Microbial Community ◽  
Biological Treatment ◽  
Community Dynamics ◽  
Fixed Bed ◽  
Urban Wastewater ◽  
Microbial Community Dynamics ◽  
Fixed Bed Bioreactor

scholarly journals Microbial community dynamics in the forefield of glaciers

2014 ◽  
Vol 281 (1795) ◽  
pp. 20140882 ◽  
Author(s):  
James A. Bradley ◽  
Joy S. Singarayer ◽  
Alexandre M. Anesio
Keyword(s):  
Microbial Community ◽  
Large Scale ◽  
Community Dynamics ◽  
Microbial Community Composition ◽  
Future Research ◽  
Nutrient Pools ◽  
Microbial Community Dynamics ◽  
Ice Retreat ◽  
External Sources ◽  
Bacteria And Fungi

Retreating ice fronts (as a result of a warming climate) expose large expanses of deglaciated forefield, which become colonized by microbes and plants. There has been increasing interest in characterizing the biogeochemical development of these ecosystems using a chronosequence approach. Prior to the establishment of plants, microbes use autochthonously produced and allochthonously delivered nutrients for growth. The microbial community composition is largely made up of heterotrophic microbes (both bacteria and fungi), autotrophic microbes and nitrogen-fixing diazotrophs. Microbial activity is thought to be responsible for the initial build-up of labile nutrient pools, facilitating the growth of higher order plant life in developed soils. However, it is unclear to what extent these ecosystems rely on external sources of nutrients such as ancient carbon pools and periodic nitrogen deposition. Furthermore, the seasonal variation of chronosequence dynamics and the effect of winter are largely unexplored. Modelling this ecosystem will provide a quantitative evaluation of the key processes and could guide the focus of future research. Year-round datasets combined with novel metagenomic techniques will help answer some of the pressing questions in this relatively new but rapidly expanding field, which is of growing interest in the context of future large-scale ice retreat.

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