Hydrogen gas production by electrohydrolysis of volatile fatty acid (VFA) containing dark fermentation effluent

2009 ◽  
Vol 34 (1) ◽  
pp. 262-269 ◽  
Author(s):  
E TUNA ◽  
F KARGI ◽  
H ARGUN
Keyword(s):  
Fatty Acid ◽  
Volatile Fatty Acid ◽  
Dark Fermentation ◽  
Gas Production ◽  
Hydrogen Gas

Efficient hydrogen gas production from cassava and food waste by a two-step process of dark fermentation and photo-fermentation

2009 ◽  
Vol 33 (10) ◽  
pp. 1458-1463 ◽  
Author(s):  
Wenming Zong ◽  
Ruisong Yu ◽  
Peng Zhang ◽  
Meizhen Fan ◽  
Zhihua Zhou
Keyword(s):  
Food Waste ◽  
Dark Fermentation ◽  
Gas Production ◽  
Hydrogen Gas ◽  
Step Process

Comparison of ryegrass and red clover on the fermentation pattern, microbial community and efficiency of diet utilisation in the rumen simulation technique (Rusitec)

2013 ◽  
Vol 53 (10) ◽  
pp. 1052 ◽  
Author(s):  
A. Belanche ◽  
M. R. F. Lee ◽  
J. M. Moorby ◽  
C. J. Newbold
Keyword(s):  
Fatty Acid ◽  
Bacterial Growth ◽  
Volatile Fatty Acid ◽  
Red Clover ◽  
Gas Production ◽  
Molecular Techniques ◽  
Microbial Protein ◽  
Cellulolytic Bacteria ◽  
Available N ◽  
Rumen Microbes

An in vitro experiment was designed to investigate the effects of incubating two forages with a different energy/nitrogen (N) ratio [perennial ryegrass (GR) vs red clover (RC)] on the efficiency of N utilisation by rumen microbes. Second-cut forages were incubated in artificial rumen fermenters (n = 8). Ryegrass represented a supply of quickly available N and energy for the rumen microorganism which led to a rapid fermentation and bacterial growth 2–4 h after feeding. Ryegrass also promoted greater numbers of anaerobic fungi, methanogens and cellulolytic bacteria, which tended to increase neutral detergent fibre disappearance, gas production, volatile fatty acid and methane production than observed using RC diets. On the contrary, RC provided slowly degradable N and energy, which led to a relatively slow bacterial growth (4–8 h after feeding). In terms of diet utilisation, RC diets promoted a higher N outflow (mainly as undegraded-N) and efficiency of microbial protein synthesis per organic matter disappeared. Even so, microbial protein yield was similar on both diets indicating a better N capture by microorganisms fed GR than in those fed RC diets. The use of 15N-labelled forages demonstrated that this high ammonia incorporation by bacteria-fed GR occurred mainly during the early fermentation coinciding with the highest bacterial growth. In conclusion, this experiment demonstrated that the use of isotopic labelling combined with molecular techniques provided an insight into forage utilisation by the rumen microbes; GR diets led to a better efficiency of N utilisation compared with RC; moreover the lower N outflow on GR diets may be partially compensated for a higher proportion of microbial protein leaving the system and the greater volatile fatty acid production. These findings seem to indicate that RC grazing may increase the N pollution compared with GR without substantial improvements on the rumen function, however this must be confirmed in vivo.

Essential oils from Lippia turbinata and Tagetes minuta persistently reduce in vitro ruminal methane production in a continuous-culture system

2019 ◽  
Vol 59 (4) ◽  
pp. 709 ◽  
Author(s):  
F. Garcia ◽  
P. E. Vercoe ◽  
M. J. Martínez ◽  
Z. Durmic ◽  
M. A. Brunetti ◽  
...  
Keyword(s):  
Fatty Acid ◽  
Essential Oils ◽  
Acid Concentration ◽  
Methane Production ◽  
Volatile Fatty Acid ◽  
Crude Protein ◽  
Gas Production ◽  
Volatile Fatty Acid Concentration ◽  
Tagetes Minuta

The aim of the present study was to evaluate the impact of essential oils (EO) from Lippia turbinata (LT) and Tagetes minuta (TM) as well as the rotation of both EO on fermentation parameters in vitro. Daily addition of LT, TM, or a 3-day rotation between them (TM/LT), as well as a control (without EO), was evaluated using the rumen simulation technique (Rusitec). The experiment lasted 19 days, with a 7-day adaptation period, followed by 12 days of treatment (Days 0–12). The EO were dissolved in ethanol (70% vol/vol) to be added daily to fermenters (300 μL/L) from Day 0. Daily measurements included methane concentration, total gas production, apparent DM disappearance and pH, which started 2 days before the addition of treatments. On Days 0, 4, 8 and 12 apparent crude protein disappearance and neutral detergent fibre disappearance, ammonia and volatile fatty acid concentration and composition were determined. Methane production was significantly inhibited shortly after addition of both EO added individually, and persisted over time with no apparent adaptation to EO addition. The TM/LT treatment showed a similar effect on methane production, suggesting that rotating the EO did not bring further improvements in reduction or persistency compared with the inclusion of the EO individually. Gas production, total volatile fatty acid concentration and composition and apparent crude protein disappearance were not affected by EO addition. Compared with the control, a 5% reduction of apparent DM disappearance and a 15% reduction of neutral detergent fibre disappearance were observed with the addition of EO. Only TM and TM/LT reduced ammonia concentration. Given the significant and persistent antimethanogenic activity of both EO, and the potential of T. minuta to modify nitrogen metabolism, EO from these plant species are of interest for developing new feed additives with potential application in ruminant nutrition that are also likely to be acceptable to consumers.

Dark fermentation: Production and utilization of volatile fatty acid from different wastes- A review

Chemosphere ◽  
2022 ◽  
Vol 288 ◽  
pp. 132444
Author(s):  
Ashutosh Kumar Pandey ◽  
S. Pilli ◽  
P. Bhunia ◽  
R.D. Tyagi ◽  
Rao Y. Surampalli ◽  
...  
Keyword(s):  
Fatty Acid ◽  
Volatile Fatty Acid ◽  
Dark Fermentation

Screening and bioprospecting of anaerobic consortia for biohydrogen and volatile fatty acid production in a vinasse based medium through dark fermentation

2018 ◽  
Vol 67 ◽  
pp. 1-7 ◽  
Author(s):  
Eduardo Bittencourt Sydney ◽  
Alessandra Cristine Novak ◽  
Drielly Rosa ◽  
Adriane Bianchi Pedroni Medeiros ◽  
Satinder Kaur Brar ◽  
...  
Keyword(s):  
Fatty Acid ◽  
Acid Production ◽  
Volatile Fatty Acid ◽  
Dark Fermentation ◽  
Fatty Acid Production

Overview of AD

2020 ◽  
Author(s):  
Jacob Joseph Lamb
Keyword(s):  
Fatty Acid ◽  
Anaerobic Digestion ◽  
Mathematical Models ◽  
Volatile Fatty Acid ◽  
Biological Process ◽  
Gas Production ◽  
Anaerobic Digester ◽  
Chemical Parameters ◽  
Reactor Configuration ◽  
Biogas Output

There are many methodologies for improving the biogas output from anaerobic digestion. These techniques include physical (e.g., gas production and feedstock parameters), reactor configuration and chemical parameters (e.g., pH and volatile fatty acid concentrations) within the digester can help to link particular functions and features of the process. Using this expanse of data, mathematical models can be used to understand and forecast the biological process within an anaerobic digester. Such models can then be further developed on a process and biological level to improve their ability to mimic the function of the reactor. This chapter will provide background into modelling and reactor configuration in order to obtain a digital twin of an anaerobic digester.

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