Direct interspecies electron transfer via conductive materials: A perspective for anaerobic digestion applications.

Algae is a very promising source for renewable energy production since it can fix the greenhouse gas (CO2) by photosynthesis and does not compete with the production of food Compared to microalgae, researches on biofuel production from macroalgae in both academia and industry are at infancy for economically efficient and technological solutions This review provides up to-date knowledge and information on macroalgae-based biofuels, such as biogas, bioethanol, biodiesel and bio-oils respectively obtained from anaerobic digestion, fermentation, transesterification, liquefaction and pyrolysis technique methods It is concluded that bioethanol and bio-oils from wet macroalgae are more competitive while biodiesel production seems less attractive compared to high lipid content microalgae biomass Finally, a biorefinery concept based on macroalgae is given

Macroalgae for biofuels production: progress and perspectives.

Conductive materials (CM) have been extensively reported to enhance methane production in anaerobic digestion processes. The occurrence of direct interspecies electron transfer (DIET) in microbial communities, as an alternative or complementary to indirect electron transfer (via hydrogen or formate), is the main explanation given to justify the improvement of methane production. Not disregarding that DIET can be promoted in the presence of certain CM, it surely does not explain all the reported observations. In fact, in methanogenic environments DIET was only unequivocally demonstrated in cocultures of Geobacter metallireducens with Methanosaeta harundinacea or Methanosarcina barkeri and frequently Geobacter sp. are not detected in improved methane production driven systems. Furthermore, conductive carbon nanotubes were shown to accelerate the activity of methanogens growing in pure cultures, where DIET is not expected to occur, and hydrogenotrophic activity is ubiquitous in full-scale anaerobic digesters...

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Methane Production and Conductive Materials: A Critical Review

Advances towards understanding and engineering direct interspecies electron transfer in anaerobic digestion

Producing biogas from straw is an effective way to manage straw from crops. However, there are difficult technical problems in the biogas fermentation process because it is difficult for anaerobic bacteria to degrade crop straw to produce biogas. Currently, pretreatment of straw is considered as a good way to enhance anaerobic digestion rate and improve biogas production. This paper summarizes the effects of different pretreatment methods of crop straw to enhance biogas production including physical, chemical, biological and combined methods in China. Each single pretreatment method has its limitations, while combined pretreatment method has synergistic pretreatment effect which has better performance than single method. Also, current and future developments are evaluated to promote straw pretreatment technology for biogas production. The development of crop straw biogas project with an economically feasible comprehensive straw pretreatment scheme is promising.

A review of crop straw pretreatment methods for biogas production by anaerobic digestion in China

A long-term study on the effect of magnetite supplementation in continuous anaerobic digestion of dairy effluent - Magnetic separation and recycling of magnetite.

Mild-temperature thermochemical pretreatment of green macroalgal biomass: Effects on solubilization, methanation, and microbial community structure.

Magnetite-assisted in situ microbial oxidation of H2S to S0 during anaerobic digestion: A new potential for sulfide control

Continuous anaerobic co-digestion of Ulva biomass and cheese whey at varying substrate mixing ratios: Different responses in two reactors with different operating regimes.

Heejung Jung

Papers

A long-term study on the effect of magnetite supplementation in continuous anaerobic digestion of dairy effluent - Magnetic separation and recycling of magnetite.

Mild-temperature thermochemical pretreatment of green macroalgal biomass: Effects on solubilization, methanation, and microbial community structure.

Magnetite-assisted in situ microbial oxidation of H2S to S0 during anaerobic digestion: A new potential for sulfide control

Continuous anaerobic co-digestion of Ulva biomass and cheese whey at varying substrate mixing ratios: Different responses in two reactors with different operating regimes.

Shifts in bacterial and archaeal community structures during the batch biomethanation of Ulva biomass under mesophilic conditions