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Related Concept Videos

Biofuels01:25

Biofuels

The microbial conversion of organic matter into biofuels holds potential as a renewable energy source. Among biofuel sources, microalgae are recognized as a highly efficient and adaptable feedstock for biodiesel production, owing to their rapid biomass accumulation, elevated lipid productivity, and capacity to proliferate in diverse aquatic systems, including freshwater, marine, and wastewater habitats. Unlike terrestrial crops, microalgae do not compete for land and can achieve significantly...
Microbial Fuel Cells01:23

Microbial Fuel Cells

Microbial fuel cells (MFCs) are bioelectrochemical devices that generate electricity by exploiting the metabolic processes of electrogenic bacteria. These systems provide a renewable energy source and serve as an innovative method for treating organic waste, such as wastewater.A typical MFC consists of two chambers: an anoxic (oxygen-free) compartment that houses the bacteria and an oxic (oxygen-rich) compartment that contains oxygen as the terminal electron acceptor. Many MFCs use proton...
Microbes and Methanogenesis01:26

Microbes 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...
Bioplastics01:27

Bioplastics

Bioplastics derived from microbial processes present a sustainable alternative to conventional petroleum-based plastics. Among these, polyhydroxyalkanoates (PHAs), particularly polyhydroxybutyrates (PHBs), have emerged as prominent candidates due to their biodegradability and biocompatibility. These polymers are synthesized by a variety of bacteria, such as Cupriavidus necator and Pseudomonas putida, which naturally accumulate PHAs as intracellular carbon and energy reserves, especially under...
Microbial Bioremediation of Hydrocarbons01:26

Microbial Bioremediation of Hydrocarbons

Bioremediation is an environmentally sustainable process that employs living organisms—primarily microorganisms—to degrade or neutralize pollutants from contaminated environments. In oil spills and hydrocarbon pollution, bioremediation involves the use of hydrocarbon-degrading bacteria to transform toxic compounds into less harmful substances. This approach leverages natural microbial metabolic processes and is considered both cost-effective and ecologically favorable compared to physical or...
Bioreactor Controls-III01:22

Bioreactor Controls-III

Strain improvement is a foundational strategy in industrial microbiology aimed at maximizing microbial productivity, particularly because natural isolates typically yield commercially valuable products in very low concentrations. Although optimizing the culture medium and environmental conditions can improve yields, these adjustments are inherently limited by the organism’s genetic potential. As a result, the focus shifts toward genetic modifications to enhance biosynthetic capacity. The...

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Hydrogen Production and Utilization in a Membrane Reactor
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Published on: March 10, 2023

Biological hydrogen production: prospects and challenges.

Hyung-Sool Lee1, Wim F J Vermaas, Bruce E Rittmann

  • 1Center for Environmental Biotechnology, Biodesign Institute at Arizona State University, P.O. Box 875701, Tempe, AZ 85287-5701, USA.

Trends in Biotechnology
|March 2, 2010
PubMed
Summary

Biological hydrogen production (BioH(2)) offers a renewable alternative to fossil fuels. This review explores photosynthetic, fermentative, and microbial electrolysis cell methods, detailing their unique benefits and challenges for sustainable H(2) generation.

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Area of Science:

  • Renewable Energy
  • Biotechnology
  • Chemical Engineering

Background:

  • Hydrogen gas is a vital energy carrier and industrial feedstock, predominantly produced from fossil fuels.
  • Current production methods are unsustainable and contribute to carbon emissions.
  • Biological hydrogen production (BioH(2)) presents a promising renewable and carbon-neutral alternative.

Purpose of the Study:

  • To review and compare different biological hydrogen production methods.
  • To outline the principles, advantages, and challenges of each BioH(2) approach.
  • To assess the potential of BioH(2) as a sustainable energy source.

Main Methods:

  • Review of scientific literature on photosynthetic, fermentative, and microbial electrolysis cell (MEC) based BioH(2).
  • Analysis of the underlying biological and chemical processes for each method.
  • Comparative assessment of efficiency, scalability, and technical hurdles.

Main Results:

  • Photosynthetic BioH(2) utilizes sunlight and water but faces oxygen sensitivity challenges.
  • Fermentative BioH(2) demonstrates high production rates but suffers from low substrate conversion efficiency.
  • Microbial electrolysis cells (MECs) offer high conversion efficiency but represent an emerging technology with development needs.

Conclusions:

  • Each BioH(2) method presents distinct advantages and challenges for renewable hydrogen generation.
  • Photosynthesis offers ultimate renewability, while MECs show high efficiency potential.
  • Further research and technological advancements are crucial for the widespread adoption of BioH(2).