Acidogenic fermentation of Scenedesmus sp.-AMDD: Comparison of volatile fatty acids yields between mesophilic and thermophilic conditions

Gruhn, Marvin; Frigon, Jean‐Claude; Guiot, Serge R.

doi:10.1016/j.biortech.2015.10.087

Cited by 26 publications

(3 citation statements)

References 40 publications

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“…Like most microalgae species in the Scenedesmus genus, S-AMDD is non-motile and colonial; typically forming clumps of f our cells or sometimes eight or more under environmentally stressful conditions [27,28]. In recent years, S-AMDD has been the focus of several studies to assess its potential as a feedstock for biofuels and bioremediation [29][30][31][32][33][34][35][36] while the evaluation of its potential suitability as a novel animal feed ingredient has only just begun [37,38]. In an initial study; S-AMDD demonstrated rapid growth rate and biomass productivity during exponential growth phase and the resulting biomass appeared to have good potential for animal nutrition based on its attractive proximate composition, favorable essential amino acid, fatty acid and elemental profiles and lack of contaminating heavy metals.…”

Section: Introductionmentioning

confidence: 99%

Nutritional Evaluation of Whole and Lipid-Extracted Biomass of the Microalga Scenedesmus sp. AMDD for Animal Feeds: Simulated Ruminal Fermentation and In Vitro Monogastric Digestibility

Tibbetts

Fredeen

2017

CBIOT

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Background: Scenedesmus sp. AMDD (S-AMDD) has been the focus of several studies to assess its potential as a feedstock for biofuels and bioremediation, while the evaluation of its potential suitability as a novel animal feed ingredient has only ju st begun. In an initial study; S-AMDD demonstrated rapid growth rate and biomass productivity during exponential growth phase and the resulting biomass appeared to have good potential for animal nutrition based on its attractive proximate composition, favorable essential amino acid, fatty acid and elemental profiles and lack of contaminating heavy metals. However, the total carbohydrate and fibre fractions of whole-cell and lipid-extracted S-AMDD were relatively high which could limit their digestion, particularly when fed to monogastric animals. The difference in the capacity to digest and metabolically utilize diets rich in cellulosic material (e.g., fibre) is vast between various farmed animal species. As such, knowledge on the nutritional value of novel ingredients for ruminant animals can rarely be immediately extrapolated to monogastrics and vice versa. Simulated fermentation using rumen-derived digestive fluids or in vitro digestibility using purified monogastric-derived enzymes can provide valuable information. Although not fully conclusive, results from these types of rapid assays are generally in expensive, require smaller amounts of sample; utilize fewer (or zero) experimental an imals, avoid feed refusal issues associated with ingredient off-flavours or odours and can be effective tools for research and for routine industrial use. Objective: The present study is the second in a series of projects designed to evaluate the nutritional value of S-AMDD for animal feed applications. The main objective was to generate novel digestibility data of whole-cell and lipid-extracted S-AMDD for both ruminant an d monogastric animals including ruminal organic matter digestibility (OMD), apparent metabolizable energy (aME) content, methane (CH4) production, dilute pepsin digestibility (DPD) and two-phase gastric/pancreatic digestibility of protein (GPDProtein) and energy (GPDEnergy). Methods: Simulated ruminal OMD, aME contents and CH4 production of experimental test diets containing graded levels of whole-cell and lipid-extracted S-AMDD were estimated using a modified batch-culture in vitro fermentation system with total gas capture using lactating dairy cattle as rumen fluid donors. In vitro monogastric DPD and two-phase GPD were measured by i ncubation of whole-cell and lipid-extracted S-AMDD samples in porcine pepsin and porcine pancreatin, containing amylase, lipase and protease enzyme solutions. Results: Simulated ruminal fermentations using lactating dairy cattle as rumen fluid donors in dicate that both whole-cell and lipid-extracted S-AMDD have excellent potential for use in ruminant animal feeds. Dietary inclusion of whole-cell S-AMDD at 50% forage protein replacement (equivalent to 20% of the total diet) or lipid-extracted S-AMDD at 100% forage protein replacemen...

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Section: Introductionmentioning

confidence: 99%

Nutritional Evaluation of Whole and Lipid-Extracted Biomass of the Microalga Scenedesmus sp. AMDD for Animal Feeds: Simulated Ruminal Fermentation and In Vitro Monogastric Digestibility

Tibbetts

Fredeen

2017

CBIOT

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“…By the VFA, yields went down by approximately 45 % from the highest value. Compared with other works, the maximum was 208 mg VFA/g TVS production from microalgal biomass using CSTR under mesophilic conditions [19]. Several digestion scenarios obtained VFA yields of 175 -243 mg VFA/g TVS from sewage, adding different concentrations of wollastonite [20].…”

Section: Vfa Concentrations and Yieldsmentioning

confidence: 76%

Study on the Potential Use of Modified Tapioca Starch Sludge Waste for Volatile Fatty Acid Generation

et al. 2022

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Starch sludge (SS) is a bulky main waste from modified tapioca starch production, a high potential substrate for alternative volatile fatty acids (VFA) production. Because it has relatively high organic content in SS is easy and fast to convert into VFA. However, there are limitations when fed overloading rate to anaerobic digestion (AD) system affecting the VFA production yield and system performance. This research aims to study the effect of initial feeding concentrations of SS between 0.5 and 2.5 % total volatile solids (TVS) on the VFA production efficiency by applying a batch continuously stirred tank reactor (CSTR) for digestion. The maximum VFA yield was 115 mg VFA/g TVS at a feeding rate of 2.0 % TVS of SS after 4 days of digestion. The digestion system could run under proper system performance and stability by showing higher pH. Besides, acetic acid was the predominant VFA intermediate indicating great effective digestion. Finally, the main bacteria in the inoculum were Arenimonas up to 33 % because it preferred to grow on glucose. And inoculum obtained from the beverage plant’s wastewater treatment system. These were so useful to select the inoculum for organic starch digestion.

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“…An interesting aspect is the production of propionic and butyric acid that is expected from the fermentation of protein-rich substrates such as microalgae [24], which could obtain a wide range of PHA copolymers. However, the production of VFA through fermentation of microalgal biomass and the consequent conversion to PHAs has received little attention and needs further study [25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Production and Characterization of Polyhydroxyalkanoates from Wastewater via Mixed Microbial Cultures and Microalgae

et al. 2022

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In the context of circular economy and sustainable production of materials, this project investigated the feasibility of producing sustainable polyhydroxyalkanoates (PHA) from microalgae and sludge used in the treatment of municipal wastewater. The overall process was studied looking at the main steps: microalgae production, fermentation of the biomass, production and characterization of the PHAs. It was possible to obtain blends of hydroxybutyrate-hydroxyvalerate copolymers with high molecular weights and different compositions depending on the nature of the feedstock (mixed volatile fatty acids). In some cases, almost completely amorphous PHA materials were obtained, suggesting a potential diversification of uses and applications.

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Acidogenic fermentation of Scenedesmus sp.-AMDD: Comparison of volatile fatty acids yields between mesophilic and thermophilic conditions

Cited by 26 publications

References 40 publications

Nutritional Evaluation of Whole and Lipid-Extracted Biomass of the Microalga Scenedesmus sp. AMDD for Animal Feeds: Simulated Ruminal Fermentation and In Vitro Monogastric Digestibility

Nutritional Evaluation of Whole and Lipid-Extracted Biomass of the Microalga Scenedesmus sp. AMDD for Animal Feeds: Simulated Ruminal Fermentation and In Vitro Monogastric Digestibility

Study on the Potential Use of Modified Tapioca Starch Sludge Waste for Volatile Fatty Acid Generation

Production and Characterization of Polyhydroxyalkanoates from Wastewater via Mixed Microbial Cultures and Microalgae

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