Volatile Fatty Acid Platform: Concept and Application

Kim, Nag‐Jong; Lim, Seung-Chan; Chang, Ho Nam

doi:10.1002/9783527803293.ch10

Cited by 24 publications

(14 citation statements)

References 32 publications

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“…However, a solution with a mixture of VFAs has a low market value, therefore, it needs to either be converted to other bioproducts or to be separated into pure components. Due to the formation of an azeotropic mixture with water, VFAs separation and recovery is laborious and energy intensive [10]. Thus, the direct application of VFAs mixture can eliminate extra energy intensive recovery processes and enhance economic feasibility.…”

Section: Introductionmentioning

confidence: 99%

“…Although there has been extensive work on the production of VFAs from waste streams [19], the process cannot easily be scaled up to industrial level due to challenges faced during the recovery of VFAs from the system [10]. The recovery of VFAs from the bioreactor is crucial to the downstream processing, and production stability and efficiency [20].…”

Section: Introductionmentioning

confidence: 99%

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MBR-Assisted VFAs Production from Excess Sewage Sludge and Food Waste Slurry for Sustainable Wastewater Treatment

et al. 2020

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The significant amount of excess sewage sludge (ESS) generated on a daily basis by wastewater treatment plants (WWTPs) is mainly subjected to biogas production, as for other organic waste streams such as food waste slurry (FWS). However, these organic wastes can be further valorized by production of volatile fatty acids (VFAs) that have various applications such as the application as an external carbon source for the denitrification stage at a WWTP. In this study, an immersed membrane bioreactor set-up was proposed for the stable production and in situ recovery of clarified VFAs from ESS and FWS. The VFAs yields from ESS and FWS reached 0.38 and 0.34 gVFA/gVSadded, respectively, during a three-month operation period without pH control. The average flux during the stable VFAs production phase with the ESS was 5.53 L/m2/h while 16.18 L/m2/h was attained with FWS. Moreover, minimal flux deterioration was observed even during operation at maximum suspended solids concentration of 32 g/L, implying that the membrane bioreactors could potentially guarantee the required volumetric productivities. In addition, the techno-economic assessment of retrofitting the membrane-assisted VFAs production process in an actual WWTP estimated savings of up to 140 €/h for replacing 300 kg/h of methanol with VFAs.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

MBR-Assisted VFAs Production from Excess Sewage Sludge and Food Waste Slurry for Sustainable Wastewater Treatment

et al. 2020

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“…The highest lipid content was achieved by P. kudriavzevii V194—64 % ( w / w ), lipid yield of 0.41 g g −1 C (grams per gram of carbon consumed), or 0.17 g g −1 of acetic acid consumed, corresponding to a lipid output of 2.5 g L −1 (all differences are statistically significant at p < 0.01 in comparison with other yeasts). Considering that the maximum theoretical yield of lipids produced per acetic acid consumed is estimated to be 0.27 g g −1 [ 47 ], P. kudriavzevii V194 produced 63% of the theoretical lipid value. A. brassicae V134 also produced more than 50% ( w / w ) of lipids, but for the remaining two species, this value was reduced to half.…”

Section: Resultsmentioning

confidence: 99%

“…Similar lipid yield values were obtained for Rhodosporidium toruloides (0.23 g g −1 ; [ 54 ]), Yarrowia lipolytica (0.27 g g −1 ; [ 55 ]), and Mortierella isabelline (0.25 g g −1 , [ 23 ]), using glucose as the carbon source. According to Kim et al [ 47 ], the maximum theoretical lipid yield for different VFA consumed are: 0.27 g g −1 for acetic acid, 0.38 g g −1 for propionic acid, 0.47 g g −1 for butyric acid, 0.52 g g −1 for valeric acid, and 0.57 g g −1 for caproic acid. Considering the composition and consumption of each VFA in our effluent filtrate, the maximum theoretical yield calculated in our conditions would be ~0.39 g g −1 of VFA consumed .…”

Section: Resultsmentioning

confidence: 99%

Single Cell Oil Production by Oleaginous Yeasts Grown in Synthetic and Waste-Derived Volatile Fatty Acids

et al. 2020

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Four yeast isolates from the species—Apiotrichum brassicae, Candida tropicalis, Metschnikowia pulcherrima, and Pichia kudriavzevii—previously selected by their oleaginous character and growth flexibility in different carbon sources, were tested for their capacity to convert volatile fatty acids into lipids, in the form of single cell oils. Growth, lipid yields, volatile fatty acids consumption, and long-chain fatty acid profiles were evaluated in media supplemented with seven different volatile fatty acids (acetic, butyric, propionic, isobutyric, valeric, isovaleric, and caproic), and also in a dark fermentation effluent filtrate. Yeasts A. brassicae and P. kudriavzevii attained lipid productivities of more than 40% (w/w), mainly composed of oleic (>40%), palmitic (20%), and stearic (20%) acids, both in synthetic media and in the waste-derived effluent filtrate. These isolates may be potential candidates for single cell oil production in larger scale applications by using alternative carbon sources, combining economic and environmental benefits.

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“…These chemicals are very versatile as building blocks and are commonly used in different industrial processes. The range of applications is quite broad [7,13]. For instance, acetic acid has an important role in the food industry [14], propionic acid is mainly used as an acidifier for animal feed and grain [15], and butyric acid can be utilized as a precursor for biofuel production [16].…”

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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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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Volatile Fatty Acid Platform: Concept and Application

Cited by 24 publications

References 32 publications

MBR-Assisted VFAs Production from Excess Sewage Sludge and Food Waste Slurry for Sustainable Wastewater Treatment

MBR-Assisted VFAs Production from Excess Sewage Sludge and Food Waste Slurry for Sustainable Wastewater Treatment

Single Cell Oil Production by Oleaginous Yeasts Grown in Synthetic and Waste-Derived Volatile Fatty Acids

Microalgae Biomass as a Potential Feedstock for the Carboxylate Platform

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