Enhancing bio-alcohol production from volatile fatty acids by suppressing methanogenic activity in single chamber microbial electrosynthesis cells (SCMECs)

2019 ◽  
Vol 7 ◽  
pp. 100292 ◽  
Author(s):  
José Gavilanes ◽  
Md Tabish Noori ◽  
Booki Min
Keyword(s):  
Fatty Acids ◽  
Volatile Fatty Acids ◽  
Single Chamber ◽  
Methanogenic Activity ◽  
Alcohol Production ◽  
Microbial Electrosynthesis

Mesoporous silica supported CeO2/Cellulose cathode catalyst for efficient bioelectrochemical reduction of inorganic carbon to biofuels

2021 ◽  
Author(s):  
Dayakar Thatikayala ◽  
Deepak Pant ◽  
Booki Min
Keyword(s):  
Fatty Acids ◽  
Mesoporous Silica ◽  
Volatile Fatty Acids ◽  
Inorganic Carbon ◽  
Cathode Catalyst ◽  
Single Chamber ◽  
Microbial Electrosynthesis ◽  
Cathode Electrode

In this study, a novel efficient cathode electrode was fabricated to convert inorganic carbon to volatile fatty acids (VFAs) through microbial electrosynthesis (MES) in a single chamber reactor. The cathode...

scholarly journals Effect of Inoculum Pretreatment on Alcohol Production from Volatile Fatty Acids through an Anaerobic Solventogenic Process

2021 ◽  
Author(s):  
Gustavo Mockaitis ◽  
Guillaume Bruant ◽  
Eugenio Foresti ◽  
Marcelo Zaiat ◽  
Serge R. Guiot
Keyword(s):  
Fatty Acids ◽  
Volatile Fatty Acids ◽  
Liquid Fuels ◽  
Biological Processes ◽  
Thermal Pretreatment ◽  
Sequencing Data ◽  
Balance Study ◽  
Alcohol Production ◽  
Acidic Pretreatment ◽  
Mass Balance Study

1AbstractBackgroundProduction of alcohols from wastes through biological processes is environmentally and economically interesting, since they can be valorized as drop-in liquid fuels, which have a high market value. Using microbial mixed cultures in such processes is of great interest since it confers more stability, a higher resistance to both toxicity and contamination, and an increased substrate flexibility. However, there is still a lack of fundamental knowledge on such microbial populations used as inoculum in solventogenic processes. This work evaluates the effect of four different physicochemical pretreatments (acidic, thermal, acidic-thermal and thermal-acidic) on an anaerobic inoculum used for alcohols production from volatile fatty acids.ResultsAll experiments were conducted in single batches using acetate and butyrate as substrates, at 30°C and with a pressurized headspace of pure H2 at 2182 mBar. Higher productions of both ethanol and butanol were achieved with both thermal and acidic-thermal pretreatments of the inoculum. The highest concentrations of ethanol and butanol produced were respectively of 122 mg.L−1 and 97 mg.L−1 for the thermal pretreatment (after 710 hours), and of 87 mg.L−1 and 143 mg.L−1 for the acidic-thermal pretreatment (after 210 hours). Butyrate was consumed and acetate was produced in all assays. A mass balance study indicated that the inoculum provided part of the substrate. Thermodynamic data indicated that a high H2 partial pressure favored solventogenic metabolic pathways. Finally, sequencing data showed that both thermal and acidic-thermal pretreatments selected mainly the bacterial genera Pseudomonas, Brevundimonas and Clostridium.ConclusionThe acidic-thermal pretreatment selected a bacterial community more adapted to the conversion of acetate and butyrate into ethanol and butanol, respectively. A higher production of ethanol was achieved with the thermal pretreatment, but at a slower rate. The thermal-acidic pretreatment was unstable, showing a huge variability between replicates. The acidic pretreatment showed the lowest alcohol production, almost negligible as compared to the control assay.

scholarly journals Acidogenesis of dairy wastewater at various pH levels

2002 ◽  
Vol 45 (10) ◽  
pp. 201-206 ◽  
Author(s):  
H.-Q. Yu ◽  
H.H.P. Fang
Keyword(s):  
Fatty Acids ◽  
Chemical Oxygen Demand ◽  
Volatile Fatty Acids ◽  
Biomass Yield ◽  
Oxygen Demand ◽  
Dairy Wastewater ◽  
Alcohol Production ◽  
Mixed Liquor ◽  
Influence Of Ph ◽  
Fatty Acids And Alcohols

Continuous experiments were conducted to study the influence of pH in the range 4.0–6.5 on the acidification of dairy wastewater at 37°C with 12 hours of hydraulic retention in an upflow reactor. Results showed that degradation of dairy pollutants increased with pH from pH 4.0 to 5.5. At pH 5.5, 95% of carbohydrate, 82% of protein and 41% of lipid were degraded. Based on chemical oxygen demand (COD), 48.4% of dairy pollutants were converted into volatile fatty acids and alcohols in the mixed liquor, 6.1% into hydrogen and methane in biogas, and the remaining 4.9% into biomass. The biomass yield at pH 5.5 was estimated as 0.32 mg-VSS/mg-COD. Further increase of pH, up to 6.5, increased degradation of carbohydrate, protein and lipid only slightly, but resulted in the lowering of overall acid and alcohol production due to their increased conversion into methane. Acetate, propionate, butyrate and ethanol are the main products of acidogenesis. Productions of propionate and ethanol were favored at pH 4.0−4.5, whereas productions of acetate and butyrate were favored at pH 6.0−6.5.

scholarly journals Microbial Communities Performing Hydrogen Solventogenic Metabolism of Volatile Fatty Acids

2021 ◽  
Author(s):  
Gustavo Mockaitis ◽  
Guillaume Bruant ◽  
Eugenio Foresti ◽  
Marcelo Zaiat ◽  
Serge Guiot
Keyword(s):  
Fatty Acids ◽  
Bacterial Community ◽  
Partial Pressure ◽  
Microbial Communities ◽  
Metabolic Pathways ◽  
Thermodynamic Data ◽  
Volatile Fatty Acids ◽  
Thermal Pretreatment ◽  
Alcohol Production ◽  
Acidic Pretreatment

Abstract Four different physicochemical pretreatments on an anaerobic inoculum used for alcohol production from acetate and butyrate are evaluated. Experiments were conducted in single batches using acetate and butyrate as substrates at 30°C and with a pressurized headspace of pure H2 at 2.15 atm (218.2 MPa). Thermal and acidic-thermal pretreatments lead to higher production of both ethanol and butanol. Modelling shows that the highest attainable concentrations of ethanol and butanol produced were 122 mg L−1 and 97 mg L−1 for the thermal pretreatment (after 17.5 days) and 87 mg L−1 and 143 mg L−1 for the acidic-thermal pretreatment (after 18.9 days). Thermodynamic data indicated that a high H2 partial pressure favoured solventogenic metabolic pathways. Acidic-thermal pretreatment selected a bacterial community more adapted to the conversion of acetate and butyrate into ethanol and butanol, respectively. Thermal-acidic pretreatment was unstable, showing significant variability between replicates. Acidic pretreatment showed the lowest alcohol production.

Single-chamber microbial fuel cells as on-line shock-sensors for volatile fatty acids in anaerobic digesters

2018 ◽  
Vol 71 ◽  
pp. 785-791 ◽  
Author(s):  
Andrea Schievano ◽  
Alessandra Colombo ◽  
Alessandra Cossettini ◽  
Andrea Goglio ◽  
Vincenzo D'Ardes ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Fuel Cells ◽  
Microbial Fuel Cells ◽  
Volatile Fatty Acids ◽  
Anaerobic Digesters ◽  
Single Chamber ◽  
On Line
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