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Bioreactor Design and Operational System01:29

Bioreactor Design and Operational System

Bioreactors are engineered vessels designed to cultivate microorganisms under controlled conditions for industrial bioprocessing. They maintain sterility and allow precise regulation of pH, temperature, oxygen, and nutrient levels to optimize microbial growth and metabolite production. Bioreactors range from small laboratory units of 1 liter to industrial systems holding up to 500,000 liters, though only about 75% of their volume is actively used for fermentation. The remaining headspace...
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In aerobic fermentations, oxygen is vital for microbial growth and metabolite production. Since air comprises only about 20% oxygen and the gas is poorly soluble in water—just 9 ppm at 20°C—supplying sufficient oxygen becomes a critical challenge, especially in high-demand processes like yeast growth or citric acid production. Even a fully saturated broth may offer only a few seconds of oxygen availability.To address this, sterile or scrubbed air is introduced into the fermentor via a sparger...
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Inoculum composition determines microbial community and function in an anaerobic sequential batch reactor.

Allison R Perrotta1, Rajkumari Kumaraswamy2, Juan R Bastidas-Oyanedel2

  • 1Department of Civil and Environmental Engineering, Massachusetts Institute of Technology (MIT), Cambridge, MA, United States of America.

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|February 15, 2017
PubMed
Summary
This summary is machine-generated.

Wastewater resource recovery via microbial fermentation is variable. This study shows that the original microbial inoculum composition, not just its diversity, predictably shapes the bioreactor

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Area of Science:

  • Environmental microbiology
  • Biotechnology
  • Sustainable resource recovery

Background:

  • Wastewater fermentation is key for resource recovery.
  • High microbial diversity in inocula is often assumed to ensure functional bioreactors.
  • Variability in fermentation product profiles remains a challenge.

Purpose of the Study:

  • To investigate the impact of inoculum on microbial community structure and function in fermentation bioreactors.
  • To understand and mitigate product variability in wastewater resource recovery.
  • To establish the link between inoculum source and bioreactor performance.

Main Methods:

  • Controlled laboratory experiments using sequential batch reactors.
  • Inoculation with three distinct complex microbial communities.
  • Monitoring of chemical composition via High-Performance Liquid Chromatography (HPLC).
  • Analysis of microbial community structure using 16S rRNA amplicon sequencing.

Main Results:

  • Distinct and highly reproducible microbial community dynamics and chemical profiles were observed, correlating with the initial inocula.
  • The generation of a complex volatile fatty acid profile was not dependent on the diversity of the initial microbial inoculum.
  • Inoculum composition significantly and predictably influenced bioreactor outcomes.

Conclusions:

  • The composition of the original microbial inoculum is a critical factor in determining bioreactor community structure and function.
  • Predictable outcomes in wastewater fermentation can be achieved by controlling inoculum characteristics.
  • This research provides insights for optimizing resource recovery processes from wastewater.