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.

Enhancing fermentative hydrogen production with the removal of volatile fatty acids by electrodialysis

2018 ◽  
Vol 263 ◽  
pp. 437-443 ◽  
Author(s):  
Pengfei Wei ◽  
Ao Xia ◽  
Qiang Liao ◽  
Chihe Sun ◽  
Yun Huang ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Hydrogen Production ◽  
Volatile Fatty Acids ◽  
Fermentative Hydrogen Production ◽  
Fermentative Hydrogen

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 Photo-hydrogen and lipid production from lactate, acetate, butyrate, and sugar manufacturing wastewater with an alternative nitrogen source byRhodobactersp.KKU-PS1

PeerJ ◽  
2019 ◽  
Vol 7 ◽  
pp. e6653 ◽  
Author(s):  
Thitirut Assawamongkholsiri ◽  
Alissara Reungsang ◽  
Sureewan Sittijunda
Keyword(s):  
Fatty Acids ◽  
Fatty Acid ◽  
Methyl Ester ◽  
Hydrogen Production ◽  
Nitrogen Source ◽  
Volatile Fatty Acids ◽  
Lipid Production ◽  
Monosodium Glutamate ◽  
Sodium Glutamate ◽  
Acetate Butyrate

Photo-hydrogen and lipid production from individual synthetic volatile fatty acids (VFAs) and sugar manufacturing wastewater (SMW) byRhodobactersp. KKU-PS1 with sodium glutamate or Aji-L (i.e., waste from the process of crystallizing monosodium glutamate) as a nitrogen source was investigated. Using individual synthetic VFAs, the maximum hydrogen production was achieved with Aji-L as a nitrogen source rather than sodium glutamate. The maximum hydrogen production was 1,727, 754 and 1,353 mL H2/L, respectively, using 25 mM of lactate, 40 mM of acetate and 15mM of butyrate as substrates. Under these conditions, lipid was produced in the range of 10.6–16.9% (w/w). Subsequently, photo-hydrogen and lipid production from SMW using Aji-L as nitrogen source was conducted. Maximal hydrogen production and hydrogen yields of 1,672 mL H2/L and 1.92 mol H2/mol substrate, respectively, were obtained. Additionally, lipid content and lipid production of 21.3% (w/w) and 475 mg lipid/L were achieved. The analysis of the lipid and fatty acid components revealed that triacyglycerol (TAG) and C18:1 methyl ester were the main lipid and fatty acid components, respectively, found inRhodobactersp. KKU-PS1 cells.

scholarly journals Fermentative Conversion of Two-Step Pre-Treated Lignocellulosic Biomass to Hydrogen

Catalysts ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 858 ◽  
Author(s):  
Karolina Kucharska ◽  
Hubert Cieśliński ◽  
Piotr Rybarczyk ◽  
Edyta Słupek ◽  
Rafał Łukajtis ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Lignocellulosic Biomass ◽  
Lignin Content ◽  
Dark Fermentation ◽  
Biomass Composition ◽  
Total Phenolic ◽  
High Hydrogen ◽  
Fermentative Hydrogen Production ◽  
Pre Treatment ◽  
Fermentative Hydrogen

Fermentative hydrogen production via dark fermentation with the application of lignocellulosic biomass requires a multistep pre-treatment procedure, due to the complexed structure of the raw material. Hence, the comparison of the hydrogen productivity potential of different lignocellulosic materials (LCMs) in relation to the lignocellulosic biomass composition is often considered as an interesting field of research. In this study, several types of biomass, representing woods, cereals and grass were processed by means of mechanical pre-treatment and alkaline and enzymatic hydrolysis. Hydrolysates were used in fermentative hydrogen production via dark fermentation process with Enterobacter aerogenes (model organism). The differences in the hydrogen productivity regarding different materials hydrolysates were analyzed using chemometric methods with respect to a wide dataset collected throughout this study. Hydrogen formation, as expected, was positively correlated with glucose concentration and total reducing sugars amount (YTRS) in enzymatic hydrolysates of LCMs, and negatively correlated with concentrations of enzymatic inhibitors i.e., HMF, furfural and total phenolic compounds in alkaline-hydrolysates LCMs, respectively. Interestingly, high hydrogen productivity was positively correlated with lignin content in raw LCMs and smaller mass loss of LCM after pre-treatment step. Besides results of chemometric analysis, the presented data analysis seems to confirm that the structure and chemical composition of lignin and hemicellulose present in the lignocellulosic material is more important to design the process of its bioconversion than the proportion between the cellulose, hemicellulose and lignin content in this material. For analyzed LCMs we found remarkable higher potential of hydrogen production via bioconversion process of woods i.e., beech (24.01 mL H2/g biomass), energetic poplar (23.41 mL H2/g biomass) or energetic willow (25.44 mL H2/g biomass) than for cereals i.e., triticale (17.82 mL H2/g biomass) and corn (14.37 mL H2/g biomass) or for meadow grass (7.22 mL H2/g biomass).

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.

scholarly journals Application of Pretreatment, Bioaugmentation and Biostimulation for Fermentative Hydrogen Production from Maize Silage

2015 ◽  
Vol 9 (1) ◽  
pp. 39-48 ◽  
Author(s):  
Vizma Nikolajeva ◽  
Miks Neibergs ◽  
Sintija Valucka ◽  
Ilze Dimanta ◽  
Janis Kleperis
Keyword(s):  
Hydrogen Production ◽  
Humic Acids ◽  
Volatile Fatty Acids ◽  
Inorganic Nitrogen ◽  
Maize Silage ◽  
Inorganic Nitrogen Source ◽  
Fermentative Hydrogen Production ◽  
Production Of Hydrogen ◽  
Fermentative Hydrogen ◽  
The Impact

Bacteria produce hydrogen during anaerobic dark digestion of carbon rich natural resources including renewable cellulosic materials. The purpose of this work was to study the impact of maize silage pretreatment with Trichoderma fungi, bioaugmentation with defined bacterial inocula and/ or biostimulation with humic acids and an additional inorganic nitrogen source on the fermentative hydrogen production in laboratory batch assay. Experiments were carried out with and without Trichoderma asperellum pretreated silage. The selected bacterial inocula consisted of Clostridium, Enterobacter and Tissierella species, with or without Bacillus mycoides. Headspace gas composition, the amount of dry particulate matter, chemical oxygen demand and concentration of volatile fatty acids in liquid were determined. Bacterial communities were studied with fluorescence in situ hibridization. The predominant cultivable microbial species were isolated and identified. The study demonstrated a significant increase of hydrogen production from maize silage by indigenous bacteria after pretreatment with Trichoderma in comparison with silage untreated with Trichoderma. From tested factors, pretreatment, biostimulation with additional nutrients (ammonium nitrate and/ or humic acids) and bioaugmentation with defined bacterial inocula, pretreatment demonstrated significant improvement of hydrogen production from maize silage. Thereby, aerobic treatment with Trichoderma could be recommended for the pretreatment of silage for the purpose of fermentative production of hydrogen.

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