Bioconversion of mature landfill leachate into biohydrogen and volatile fatty acids via microalgal photosynthesis together with dark fermentation

2021 ◽  
pp. 115035
Author(s):  
Haowen Feng ◽  
Chihe Sun ◽  
Chaofan Zhang ◽  
Haixing Chang ◽  
Nianbing Zhong ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Landfill Leachate ◽  
Volatile Fatty Acids ◽  
Dark Fermentation ◽  
Mature Landfill Leachate

Use of organic waste for biohydrogen production and volatile fatty acids via dark fermentation and further processing to methane

2019 ◽  
Vol 44 (44) ◽  
pp. 24110-24125 ◽  
Author(s):  
Tobias Weide ◽  
Elmar Brügging ◽  
Christof Wetter ◽  
Antonio Ierardi ◽  
Marc Wichern
Keyword(s):  
Fatty Acids ◽  
Organic Waste ◽  
Volatile Fatty Acids ◽  
Dark Fermentation ◽  
Biohydrogen Production

scholarly journals Effect of pH on the Economic Potential of Dark Fermentation Products from Used Disposable Nappies and Expired Food Products

2021 ◽  
Vol 11 (9) ◽  
pp. 4099
Author(s):  
Dimitris Zagklis ◽  
Marina Papadionysiou ◽  
Konstantina Tsigkou ◽  
Panagiota Tsafrakidou ◽  
Constantina Zafiri ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Hydrogen Production ◽  
Volatile Fatty Acids ◽  
Food Products ◽  
Treatment Method ◽  
Dark Fermentation ◽  
Biodiesel Production ◽  
Economic Potential ◽  
Fermentation Products ◽  
Ph Values

Used disposable nappies constitute a waste stream that has no established treatment method. The purpose of this study was the assessment of the dark fermentation of used disposable nappies and expired food products under different pH values. The biodegradable part of the used disposable nappies was recovered and co-fermented with expired food products originating from supermarkets. The recoverable economic potential of the process was examined for different volatile fatty acids exploitation schemes and process pH values. The process pH strongly affected the products, with optimum hydrogen production at pH 6 (4.05 NLH2/Lreactor), while the amount of produced volatile fatty acids was maximized at pH 7 (13.44 g/L). Hydrogen production was observed at pH as low as pH 4.5 (2.66 NLH2/Lreactor). The recoverable economic potential was maximized at two different pH values, with the first being pH 4.5 with minimum NaOH addition requirements (181, 138, and 296 EUR/ton VS of substrate for valorization of volatile fatty acids through microbial fuel cell, biodiesel production, and anaerobic digestion, respectively) and the second being pH 6, where the hydrogen production was maximized with the simultaneous production of high amounts of volatile fatty acids (191, 142, and 339 EUR/ton VS of substrate respectively).

scholarly journals Valorization of volatile fatty acids from the dark fermentation waste Streams-A promising pathway for a biorefinery concept

2021 ◽  
Vol 143 ◽  
pp. 110971
Author(s):  
Patrick T. Sekoai ◽  
Anish Ghimire ◽  
Obinna T. Ezeokoli ◽  
Subramanya Rao ◽  
Wing Y. Ngan ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Volatile Fatty Acids ◽  
Dark Fermentation ◽  
Waste Streams

Sequential generation of hydrogen and lipids from starch by combination of dark fermentation and microalgal cultivation

RSC Advances ◽  
2015 ◽  
Vol 5 (94) ◽  
pp. 76779-76782 ◽  
Author(s):  
Hong-Yu Ren ◽  
Bing-Feng Liu ◽  
Fanying Kong ◽  
Lei Zhao ◽  
Nan-Qi Ren
Keyword(s):  
Fatty Acids ◽  
Hydrogen Production ◽  
Volatile Fatty Acids ◽  
Lipid Production ◽  
Dark Fermentation ◽  
Simultaneous Treatment ◽  
Microalgal Cultivation ◽  
Fermentative Hydrogen Production ◽  
Fermentative Hydrogen ◽  
Sequential Generation

Dark fermentative hydrogen production and microalgal lipid production was successfully combined to enhance the energy conversion from starch with simultaneous treatment of volatile fatty acids in the effluent.

scholarly journals Dark Fermentation of Sweet Sorghum Stalks, Cheese Whey and Cow Manure Mixture: Effect of pH, Pretreatment and Organic Load

Processes ◽  
2021 ◽  
Vol 9 (6) ◽  
pp. 1017
Author(s):  
Margarita Andreas Dareioti ◽  
Aikaterini Ioannis Vavouraki ◽  
Konstantina Tsigkou ◽  
Constantina Zafiri ◽  
Michael Kornaros
Keyword(s):  
Fatty Acids ◽  
Hydrogen Production ◽  
Sweet Sorghum ◽  
Volatile Fatty Acids ◽  
Cheese Whey ◽  
Dark Fermentation ◽  
Organic Load ◽  
Anaerobic Sludge ◽  
Hydrogen Yield ◽  
Cow Manure

The aim of this study was to determine the optimal conditions for dark fermentation using agro-industrial liquid wastewaters mixed with sweet sorghum stalks (i.e., 55% sorghum, 40% cheese whey, and 5% liquid cow manure). Batch experiments were performed to investigate the effect of controlled pH (5.0, 5.5, 6.0, 6.5) on the production of bio-hydrogen and volatile fatty acids. According to the obtained results, the maximum hydrogen yield of 0.52 mol H2/mol eq. glucose was measured at pH 5.5 accompanied by the highest volatile fatty acids production, whereas similar hydrogen productivity was also observed at pH 6.0 and 6.5. The use of heat-treated anaerobic sludge as inoculum had a positive impact on bio-hydrogen production, exhibiting an increased yield of 1.09 mol H2/mol eq. glucose. On the other hand, the pretreated (ensiled) sorghum, instead of a fresh one, led to a lower hydrogen production, while the organic load decrease did not affect the process performance. In all experiments, the main fermentation end-products were volatile fatty acids (i.e., acetic, propionic, butyric), ethanol and lactic acid.

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