Volatile fatty acids production from protease pretreated <i>Chlorella</i> biomass via anaerobic digestion

Magdalena, José Antonio; Tomás‐Pejó, Elia; Ballesteros, Mercedes; González‐Fernández, Cristina

doi:10.1002/btpr.2696

Cited by 23 publications

(9 citation statements)

References 28 publications

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“…For instance, digestion of Chlorella sp. at acidic pH values (5.5) and 25 °C showed up to 47% VFAs-COD/CODin, similar to what was attained in the same experiment at neutral pH values and the same temperature (7.5, 45.1% VFAs-COD/CODin) [30]. However, the use of pH values in the basic range has also resulted in good organic matter conversions into VFAs.…”

Section: Volatile Fatty Acid Production By Means Of Anaerobic Fermsupporting

confidence: 78%

“…On the contrary, other investigations obtained similar conversion yields (45–48% VFAs-COD/CODin) at temperatures of 25 °C and 35 °C when compared to 50 °C (37% VFAs-COD/CODin) when using protease pretreated Chlorella sp. as a substrate [30]. These differences might rely on the state of the biomass (raw or pretreated).…”

Section: Volatile Fatty Acid Production By Means Of Anaerobic Fermmentioning

confidence: 99%

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Microalgae Biomass as a Potential Feedstock for the Carboxylate Platform

Magdalena

González‐Fernández

2019

Molecules

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Volatile fatty acids (VFAs) are chemical building blocks for industries, and are mainly produced via the petrochemical pathway. However, the anaerobic fermentation (AF) process gives a potential alternative to produce these organic acids using renewable resources. For this purpose, waste streams, such as microalgae biomass, might constitute a cost-effective feedstock to obtain VFAs. The present review is intended to summarize the inherent potential of microalgae biomass for VFA production. Different strategies, such as the use of pretreatments to the inoculum and the manipulation of operational conditions (pH, temperature, organic loading rate or hydraulic retention time) to promote VFA production from different microalgae strains, are discussed. Microbial structure analysis using microalgae biomass as a substrate is pointed out in order to further comprehend the roles of bacteria and archaea in the AF process. Finally, VFA applications in different industry fields are reviewed.

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Section: Volatile Fatty Acid Production By Means Of Anaerobic Fermsupporting

confidence: 78%

Section: Volatile Fatty Acid Production By Means Of Anaerobic Fermmentioning

confidence: 99%

Microalgae Biomass as a Potential Feedstock for the Carboxylate Platform

Magdalena

González‐Fernández

2019

Molecules

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“…Propionic acid accumulation has already been reported in the literature for its inhibitory effects, that its higher oxidation is unfavorable for the smooth operation of the AD process. Furthermore, various factors such as pH, temperature, hydrogen partial pressure, and other VFAs accelerates propionic acid oxidation [51,16,52]. As a result, it inhibits methanogenic bacteria that utilize acetate for methane production [53].…”

Section: Detection Of Vfas Concentrationmentioning

confidence: 99%

Assessment of multiple anaerobic co-digestions and related microbial community of molasses with rice alcohol wastewater

Khan

Jiang

et al. 2020

Preprint

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Background Molasses is a highly dense and refined byproduct produced in the sugarcane industry, and it contains high amounts of degradable compounds. These compounds can potentially be converted into renewable products biologically. However, the involved biological process is negatively influenced by the high chemical oxygen demand (COD) of molasses and its high ion concentration, although this problem is commonly addressed by dilutions. Results The co-digestion of molasses with rice alcohol waste water (RAW) was compared with its mono-digestion at an increasing organic loading rate (OLR). Both processes were assessed by detecting the COD removal rate, the methane contents of biogas, and the structure and composition of microbial communities at different stages. Results showed that the co-digestion is stable up to a maximum OLR of 16 g COD L− 1d− 1. By contrast, after the acclimatization phase, the mono-digestion process was upset twice, which occurred at a maximum OLR of 9 and 10 g COD L− 1d− 1. The co-digestion procgess demonstrated consistency in terms of COD removal rates (86.36% ± 0.99–90.72% ± 0.63%) and methane contents (58.10% ± 1.12–64.47% ± 0.59%) compared with the mono-digestion process. Microbial community analysis showed that the relative abundance of bacterial and archaeal communities differs between the processes at different stages. However, in both processes, Propionibacteriaceae was the most abundant family in the bacterial communities, whereas Methanosaetaceae was abundant in the archaeal communities. Conclusion Rice alcohol wastewater could be a good co-substrate for anaerobic digestion of molasses. Integrate molasses into progressive biogas production at high OLR.

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“…More specifically, VFAs are intermediate compounds produced after the hydrolytic and the acidogenic stage of AD. Acetic, propionic, iso‐butyric, butyric, iso‐valeric, valeric and caproic acids are the most commonly found VFAs (Magdalena, Tomás‐pejó, Ballesteros, & González‐fernandez, ). These chemicals can be further used as carbon sources for oleaginous yeasts, which accumulate lipids in lipid bodies (LBs; Figure ).…”

Section: Vfas As a Novel Substrate For Oil Productionmentioning

confidence: 99%

Volatile fatty acids as novel building blocks for oil‐based chemistry via oleaginous yeast fermentation

Llamas

Magdalena

González‐Fernández

et al. 2019

Biotech & Bioengineering

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Microbial oils are proposed as a suitable alternative to petroleum‐based chemistry in terms of environmental preservation. These oils have traditionally been studied using sugar‐based feedstock, which implies high costs, substrate limitation, and high contamination risks. In this sense, low‐cost carbon sources such as volatile fatty acids (VFAs) are envisaged as promising building blocks for lipid biosynthesis to produce oil‐based bioproducts. VFAs can be generated from a wide variety of organic wastes through anaerobic digestion and further converted into lipids by oleaginous yeasts (OYs) in a fermentation process. These microorganisms can accumulate in the form of lipid bodies, lipids of up to 60% wt/wt of their biomass. In this context, OY is a promising biotechnological tool for biofuel and bioproduct generation using low‐cost VFA media as substrates. This review covers recent advances in microbial oil production from VFAs. Production of VFAs via anaerobic digestion processes and the involved metabolic pathways are reviewed. The main challenges as well as recent approaches for lipid overproduction are also discussed.

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Volatile fatty acids production from protease pretreated Chlorella biomass via anaerobic digestion

Cited by 23 publications

References 28 publications

Microalgae Biomass as a Potential Feedstock for the Carboxylate Platform

Microalgae Biomass as a Potential Feedstock for the Carboxylate Platform

Assessment of multiple anaerobic co-digestions and related microbial community of molasses with rice alcohol wastewater

Volatile fatty acids as novel building blocks for oil‐based chemistry via oleaginous yeast fermentation

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