Related Experiment Video
Updated: Jul 19, 2026
07:31
Agarose-Based Model Ecosystem for Cultivating Methanotrophs in a Methane-Oxygen Counter Gradient
Published on: September 6, 2024
Archaeal population on supporting material in methanogenic packed-bed reactor
Kengo Sasaki1, Shin Haruta, Yoshiyuki Ueno
1Department of Biotechnology, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Tokyo, Japan.
Journal of Bioscience and Bioengineering
|October 19, 2006
Summary
Methanogenic archaea populations differed in packed-bed reactors under high organic loading. Methanosarcina sp. dominated the supporting material, unlike the effluent, especially with short hydraulic retention times.
Area of Science:
- Microbiology
- Environmental Engineering
- Biotechnology
Background:
- Methanogenic archaea are crucial for anaerobic digestion.
- Packed-bed reactors are widely used in wastewater treatment.
- Understanding microbial population dynamics is key to optimizing reactor performance.
Purpose of the Study:
- To determine the population of methanogenic archaea in a packed-bed reactor.
- To investigate the distribution of these archaea on supporting material versus in effluent.
- To identify specific archaeal groups dominating under specific operational conditions.
Main Methods:
- Analysis of methanogenic archaea populations.
- Packed-bed reactor operation under high organic loading rate (OLR) and short hydraulic retention time (HRT).
- Comparison of microbial communities on supporting material and in effluent.
Main Results:
- A distinct difference in methanogenic archaea populations was observed between the supporting material and the effluent.
- This difference was particularly evident under high OLR and short HRT.
- Methanosarcina sp. was found to be predominant on the supporting material.
Conclusions:
- Operational conditions like high OLR and short HRT significantly influence methanogenic archaea distribution in packed-bed reactors.
- Methanosarcina sp. shows a strong affinity for the supporting material under these conditions.
- This finding has implications for optimizing anaerobic digestion processes and reactor design.
Related Concept Videos
01:18Deep Sea Microbial Ecology
The deep ocean and its underlying sediments represent vast, largely unexplored microbial habitats that extend far beyond the sunlit photic zone. The photic (euphotic) zone typically spans the upper ~100–200 meters of pelagic waters in the open ocean, but its depth varies geographically and seasonally, where sufficient light supports photosynthetic life. Below this lies the deep sea, spanning roughly 1000–6000 meters (bathypelagic to abyssal zones), with deeper hadal trenches extending beyond...
01:25Microbial Mats
Microbial communities forming biofilms and mats represent complex, spatially structured ecosystems where metabolic processes are stratified according to light, oxygen, and nutrient gradients. Biofilms are initial colonization stages, only a few millimeters thick, while mature microbial mats can reach centimeter-scale thickness and display intricate vertical organization. Their structural and functional heterogeneity allows microorganisms to occupy distinct ecological niches within a few...
01:29Overview of Archaea
Archaea, named after the Archaean eon, represent a unique domain of life, distinct from bacteria and eukaryotes, with remarkable traits. Their cellular and molecular features, ecological adaptability, and industrial relevance highlight their importance in understanding life processes and leveraging biotechnology.Cellular and Molecular CharacteristicsA defining feature of archaea is their unique membrane composition. Archaeal membranes contain ether-linked isoprenoid lipids, which confer...
01:26Microbes and Methanogenesis
Methanogenesis is a critical microbial process in anaerobic ecosystems responsible for the biological production of methane, a potent greenhouse gas and valuable biofuel. This metabolic pathway is primarily facilitated by methanogenic archaea, which thrive in anoxic environments such as wetlands, sediments, and animal gastrointestinal tracts. The absence of oxygen in these habitats prevents aerobic respiration, thereby favoring alternative biochemical pathways for organic matter degradation.In...
01:30Diversity of Archaea I
Archaea, a domain of single-celled microorganisms, are classified into five major phyla based on genetic and biochemical characteristics: Euryarchaeota, Crenarchaeota, Thaumarchaeota, Korarchaeota, and Nanoarchaeota. Among these, the phylum Euryarchaeota is notable for its remarkable diversity in morphology, metabolism, and ecological adaptations.Morphological and Metabolic DiversityMembers of Euryarchaeota exhibit a variety of cellular shapes, including rods and cocci. Their metabolic pathways...
01:27Diversity of Archaea III
Crenarchaeota, a prominent phylum of Archaea, is remarkable for its ability to thrive in extreme environments characterized by high temperatures and acidity. These microorganisms inhabit sulfuric hot springs, volcanic systems, and submarine hydrothermal vents, where temperatures often exceed 100°C. The unique adaptations of Crenarchaeota not only allow survival under such extreme conditions but also provide insights into the mechanisms of life in primordial Earth-like environments.Morphological...