Fatty acids production from hydrogen and carbon dioxide by mixed culture in the membrane biofilm reactor

Zhang, Fang; Ding, Jing; Zhang, Yan; Chen, Man; Ding, Zhiying; Loosdrecht, M.C.M. van; Zeng, Raymond J.

doi:10.1016/j.watres.2013.07.033

Cited by 182 publications

(116 citation statements)

References 34 publications

Supporting

Mentioning

107

Contrasting

Unclassified

Order By: Relevance

“…Operating a direct MES reactor through H 2 under galvanostatic control may offer a competitive advantage for the acetogens versus methanogens in that high H 2 partial pressure favors acetogenesis. Furthermore, allowing the pH to drop below 6 may also favor the acetogens since lower pH can also inhibit methanogenesis (Ni et al, 2010; Zhang et al, 2013; Spirito et al, 2014). Methanogens initially present in the community enriched for this biocathode were eliminated by repeated exposure to high H 2 , low pH, and the addition of the inhibitor sodium bromoethanesulfonate (NaBES) (Marshall et al, 2012, 2013; LaBelle et al, 2014).…”

Section: Resultsmentioning

confidence: 99%

Energy Efficiency and Productivity Enhancement of Microbial Electrosynthesis of Acetate

2017

View full text Add to dashboard Cite

It was hypothesized that a lack of acetogenic biomass (biocatalyst) at the cathode of a microbial electrosynthesis system, due to electron and nutrient limitations, has prevented further improvement in acetate productivity and efficiency. In order to increase the biomass at the cathode and thereby performance, a bioelectrochemical system with this acetogenic community was operated under galvanostatic control and continuous media flow through a reticulated vitreous carbon (RVC) foam cathode. The combination of galvanostatic control and the high surface area cathode reduced the electron limitation and the continuous flow overcame the nutrient limitation while avoiding the accumulation of products and potential inhibitors. These conditions were set with the intention of operating the biocathode through the production of H2. Biofilm growth occurred on and within the unmodified RVC foam regardless of vigorous H2 generation on the cathode surface. A maximum volumetric rate or space time yield for acetate production of 0.78 g/Lcatholyte/h was achieved with 8 A/Lcatholyte (83.3 A/m2projected surface area of cathode) supplied to the continuous flow/culture bioelectrochemical reactors. The total Coulombic efficiency in H2 and acetate ranged from approximately 80–100%, with a maximum of 35% in acetate. The overall energy efficiency ranged from approximately 35–42% with a maximum to acetate of 12%.

show abstract

Section: Resultsmentioning

confidence: 99%

Energy Efficiency and Productivity Enhancement of Microbial Electrosynthesis of Acetate

2017

View full text Add to dashboard Cite

show abstract

“…The SLB4 and 11 showed !96.0% similarity to Clostridium cellulosi and a bacterium clone from a starch fermentation process that produces hydrogen (Akutsu et al, 2008). The SLB6 showed 100% sequence similarity to two uncultured clones from a mixed-culture syngas fermentation reactor (Zhang et al, 2013) and a microbial fuel cell (MFC) (Jung and Regan, 2007), respectively. The SLB7 exhibited a poor sequence homology of 88.5% with its nearest species and was unclassifiable at the class level (bootstrap value < 20%); however, this band showed 100% similarity to an uncultured clone from a waste silk fermenter (Zhang et al, 2011) and was also closely related to an uncultured rumen bacterium (GenBank accession no.…”

Section: Dgge and Phylogenetic Affiliationmentioning

confidence: 99%

Response of a continuous biomethanation process to transient organic shock loads under controlled and uncontrolled pH conditions

Kim

Lee

2015

Water Research

View full text Add to dashboard Cite

“…), production of volatile fatty acids (Zhang et al. ; Jung et al. ), anaerobic digestion (Zinder et al.…”

Section: Introductionmentioning

confidence: 99%

Anaerobic microbial community response to methanogenic inhibitors 2‐bromoethanesulfonate and propynoic acid

et al. 2016

View full text Add to dashboard Cite

Methanogenic inhibitors are often used to study methanogenesis in complex microbial communities or inhibit methanogens in the gastrointestinal tract of livestock. However, the resulting structural and functional changes in archaeal and bacterial communities are poorly understood. We characterized microbial community structure and activity in mesocosms seeded with cow dung and municipal wastewater treatment plant anaerobic digester sludge after exposure to two methanogenic inhibitors, 2‐bromoethanesulfonate (BES) and propynoic acid (PA). Methane production was reduced by 89% (0.5 mmol/L BES), 100% (10 mmol/LBES), 24% (0.1 mmol/LPA), and 95% (10 mmol/LPA). Using modified primers targeting the methyl‐coenzyme M reductase (mcrA) gene, changes in mcrA gene expression were found to correspond with changes in methane production and the relative activity of methanogens. Methanogenic activity was determined by the relative abundance of methanogen 16S rRNA cDNA as a percentage of the total community 16S rRNA cDNA. Overall, methanogenic activity was lower when mesocosms were exposed to higher concentrations of both inhibitors, and aceticlastic methanogens were inhibited to a greater extent than hydrogenotrophic methanogens. Syntrophic bacterial activity, measured by 16S rRNA cDNA, was also reduced following exposure to both inhibitors, but the overall structure of the active bacterial community was not significantly affected.

show abstract

Fatty acids production from hydrogen and carbon dioxide by mixed culture in the membrane biofilm reactor

Cited by 182 publications

References 34 publications

Energy Efficiency and Productivity Enhancement of Microbial Electrosynthesis of Acetate

Energy Efficiency and Productivity Enhancement of Microbial Electrosynthesis of Acetate

Response of a continuous biomethanation process to transient organic shock loads under controlled and uncontrolled pH conditions

Anaerobic microbial community response to methanogenic inhibitors 2‐bromoethanesulfonate and propynoic acid

Contact Info

Product

Resources

About