Volatile fatty acids production during mixed culture fermentation – The impact of substrate complexity and pH

2017 ◽  
Vol 326 ◽  
pp. 901-910 ◽  
Author(s):  
Ewelina Jankowska ◽  
Joanna Chwialkowska ◽  
Mikolaj Stodolny ◽  
Piotr Oleskowicz-Popiel
Keyword(s):  
Fatty Acids ◽  
Mixed Culture ◽  
Volatile Fatty Acids ◽  
Mixed Culture Fermentation ◽  
The Impact

Effect of pH and retention time on volatile fatty acids production during mixed culture fermentation

2015 ◽  
Vol 190 ◽  
pp. 274-280 ◽  
Author(s):  
Ewelina Jankowska ◽  
Joanna Chwiałkowska ◽  
Mikołaj Stodolny ◽  
Piotr Oleskowicz-Popiel
Keyword(s):  
Fatty Acids ◽  
Mixed Culture ◽  
Retention Time ◽  
Volatile Fatty Acids ◽  
Mixed Culture Fermentation ◽  
Effect Of Ph

scholarly journals Volatile Fatty Acids Production from Microalgae Biomass: Anaerobic Digester Performance and Population Dynamics during Stable Conditions, Starvation, and Process Recovery

Molecules ◽  
2019 ◽  
Vol 24 (24) ◽  
pp. 4544 ◽  
Author(s):  
Jose Antonio Magdalena ◽  
Elia Tomás-Pejó ◽  
Cristina González-Fernández
Keyword(s):  
Fatty Acids ◽  
Volatile Fatty Acids ◽  
Starvation Period ◽  
Reactor Performance ◽  
Methane Generation ◽  
Microbial Response ◽  
Stable Conditions ◽  
Microbial Analysis ◽  
Process Disturbances ◽  
The Impact

Disturbances in anaerobic digestion (AD) negatively impact the overall reactor performance. These adverse effects have been widely investigated for methane generation. However, AD recently appeared as a potential technology to obtain volatile fatty acids (VFAs) and thus, the impact of process disturbances must be evaluated. In this sense, microbial response towards a starvation period of two weeks was investigated resulting in a conversion of organic matter into VFAs of 0.39 ± 0.03 COD-VFAs/CODin. However, the lack of feeding reduced the yield to 0.30 ± 0.02 COD-VFAs/CODin. Microbial analysis revealed that the starvation period favored the syntrophic acetate-oxidizing bacteria coupled with hydrogenotrophic methanogens. Finally, the system was fed at 9 g COD/Ld resulting in process recovery (0.39 ± 0.04 COD-VFAs/CODin). The different microbiome obtained at the end of the process was proved to be functionally redundant, highlighting the AD robustness for VFAs production.

scholarly journals Economic process to produce biohydrogen and volatile fatty acids by a mixed culture using vinasse from sugarcane ethanol industry as nutrient source

2014 ◽  
Vol 159 ◽  
pp. 380-386 ◽  
Author(s):  
Eduardo Bittencourt Sydney ◽  
Christian Larroche ◽  
Alessandra Cristine Novak ◽  
Regis Nouaille ◽  
Saurabh Jyoti Sarma ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Mixed Culture ◽  
Volatile Fatty Acids ◽  
Nutrient Source ◽  
Economic Process

Toxicity of pH, Ammonia and Volatile Fatty Acids on Hydrogenotrophic Methanogen-Enriched Sludge

2014 ◽  
Vol 955-959 ◽  
pp. 527-531
Author(s):  
Jian Zheng Li ◽  
Yu Peng Zhang ◽  
Chong Liu ◽  
Ze Yu Tang
Keyword(s):  
Fatty Acids ◽  
Acetic Acid ◽  
Anaerobic Digestion ◽  
Propionic Acid ◽  
Butyric Acid ◽  
Volatile Fatty Acids ◽  
Batch Experiments ◽  
Inhibitory Effects ◽  
Hydrogenotrophic Methanogen ◽  
The Impact

The activities of methanogen are easily affected by inhibitory substances and lead to anaerobic digestion failure. To investigate inhibitory effects on methanogenesis of a methanogen-enriched sludge, pH, volatile fatty acids (such as acetic acid, propionic acid and butyric acid), and ammonia were used as inhibitory factors and a L16(45) orthogonal table was employed to design batch experiments. The result of variance analyses shows that pH has the greatest impact on the methanogenesis of the enriched culture. The impact of butyrate, NH3, acetate and propionate was decreased in order. DGGE finger-print shows that there was only one methanogen in the inoculum sludge.

scholarly journals Optimizing the impact of temperature on bio-hydrogen production from food waste and its derivatives under no pH control using statistical modelling

2015 ◽  
Vol 12 (21) ◽  
pp. 6503-6514 ◽  
Author(s):  
C. Arslan ◽  
A. Sattar ◽  
C. Ji ◽  
S. Sattar ◽  
K. Yousaf ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Hydrogen Production ◽  
Food Waste ◽  
Volatile Fatty Acids ◽  
Negative Impact ◽  
Glucose Consumption ◽  
Statistical Modelling ◽  
Effect Of Temperature ◽  
Coefficient Of Determination ◽  
The Impact

Abstract. The effect of temperature on bio-hydrogen production by co-digestion of sewerage sludge with food waste and its two derivatives, i.e. noodle waste and rice waste, was investigated by statistical modelling. Experimental results showed that increasing temperature from mesophilic (37 °C) to thermophilic (55 °C) was an effective mean for increasing bio-hydrogen production from food waste and noodle waste, but it caused a negative impact on bio-hydrogen production from rice waste. The maximum cumulative bio-hydrogen production of 650 mL was obtained from noodle waste under thermophilic temperature condition. Most of the production was observed during the first 48 h of incubation, which continued until 72 h of incubation. The decline in pH during this interval was 4.3 and 4.4 from a starting value of 7 under mesophilic and thermophilic conditions, respectively. Most of the glucose consumption was also observed during 72 h of incubation and the maximum consumption was observed during the first 24 h, which was the same duration where the maximum pH drop occurred. The maximum hydrogen yields of 82.47 mL VS−1, 131.38 mL COD−1, and 44.90 mL glucose−1 were obtained from thermophilic food waste, thermophilic noodle waste and mesophilic rice waste, respectively. The production of volatile fatty acids increased with an increase in time and temperature in food waste and noodle waste reactors whereas they decreased with temperature in rice waste reactors. The statistical modelling returned good results with high values of coefficient of determination (R2) for each waste type and 3-D response surface plots developed by using models developed. These plots developed a better understanding regarding the impact of temperature and incubation time on bio-hydrogen production trend, glucose consumption during incubation and volatile fatty acids production.

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