Electron transfer and mechanism of energy production among syntrophic bacteria during acidogenic fermentation : A review

• Volatile fatty acids (VFAs) production plays an important role in the process of anaerobic digestion (AD), which is often the critical factor determining the metabolic pathways and energy recovery efficiency. Fermenting bacteria and acetogenic bacteria are in syntrophic relations during AD. Thus, clear elucidation of the interspecies electron transfer and energetic mechanisms among syntrophic bacteria is essential for optimization of acidogenic. This review aims to discuss the electron transfer and energetic mechanism in syntrophic processes between fermenting bacteria and acetogenic bacteria during VFAs production. Homoacetogenesis also plays a role in the syntrophic system by converting H2 and CO2 to acetate. Potential applications of these syntrophic activities in bioelectrochemical system and value-added product recovery from AD of organic wastes are also discussed. The study of acidogenic syntrophic relations is in its early stages, and additional investigation is required to better understand the mechanism of syntrophic relations. 

Subject headings

TEKNIK OCH TEKNOLOGIER  -- Industriell bioteknik -- Bioprocessteknik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Industrial Biotechnology -- Bioprocess Technology (hsv//eng)

Keyword

Acidogenic fermentation

Electron transfer

Energetic mechanism

Syntrophic bacteria

Volatile fatty acids

Anaerobic digestion

Bacteria

Electron transitions

Electron transport properties

Acetogenic bacteria

Bio-electrochemical systems

Energy recovery efficiency

Fermenting bacteria

Value added products

Volatile fatty acids (VFAs)

acetic acid

alcohol

butyric acid

carbon dioxide

hydrogen

propionic acid

volatile fatty acid

methane

bacterium

degradation

electron transport

energy yield

nonhuman

organic waste

priority journal

product recovery

Review

anaerobic growth

bioreactor

electron

fermentation

Anaerobiosis

Bioreactors

Electrons

Fatty Acids

Volatile

Resource Recovery

Resursåtervinning

Publication and Content Type

ref (subject category)

for (subject category)