Towards Biorefinery Production of Microalgal Biofuels and Bioproducts: Production of Acetic Acid from the Fermentation of &amp;lt;i&amp;gt;Chlorella&amp;lt;/i&amp;gt; sp. and &amp;lt;i&amp;gt;Tetraselmis suecica&amp;lt;/i&amp;gt; Hydrolysates

Kassim, Mohd Asyraf; Rashid, Mohd Aziz; Halim, Ronald

doi:10.4236/gsc.2017.72012

Cited by 9 publications

(6 citation statements)

References 28 publications

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“…The carbohydrate productivity could be influenced by extrinsic and intrinsic factors during the cultivation period [ 46 ]. Previous reports have clearly indicated that CO 2 concentrations, temperature, pH, light intensity, salinity, and nitrogen source significantly affect the productivity capacity of microalgae [ 47 , 48 ]. It has been highlighted that both pH and CO 2 levels could be the most crucial factors [ 39 , 40 ] due to the higher formation ratio of carbonic acid in the medium when the CO 2 level increases [ 49 ].…”

Section: Resultsmentioning

confidence: 99%

Pollutant Gases to Algal Animal Feed: Impacts of Poultry House Exhaust Air on Amino Acid Profile of Algae

Uguz,

Sozcu

2024

Animals

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Algae provide a rich source of proteins, lipids, vitamins, and minerals, making them valuable feed ingredients in animal nutrition. Beyond their nutritional benefits, algae have been recognized for their potential to mitigate the negative environmental impacts of poultry production. Poultry production is crucial for the global food supply but contributes to environmental concerns, particularly in terms of ammonia and carbon dioxide gas emissions. This study emphasizes the importance of reducing greenhouse gas and ammonia production in poultry operations by utilizing algae species suitable for animal consumption, highlighting the need for sustainable feed sources. This study investigated the effects of poultry exhaust air and culture conditions on the amino acid profiles of three microalgae species, namely, Scenedesmus sp. (AQUAMEB-60), Ankistrodesmus sp. (AQUAMEB-33), and Synechococcaceae (AQUAMEB 32). The experiments were conducted in a commercial broiler farm in Bursa, Turkey, focusing on reducing pollutant gas emissions and utilizing poultry exhaust air in algae cultivation. The highest protein content of 50.4% was observed in the biomass of Synechococcaceae with BBM and DI water. Scenedesmus sp. had the highest carbohydrate content of 33.4% cultivated with DI water. The algae biomass produced from Synechococcaceae growth with DI water was found to have the highest content of essential and nonessential amino acids, except for glutamic acid and glycine. The arsenic, cadmium, and mercury content showed variations within the following respective ranges: 1.076–3.500 mg/kg, 0.0127–0.1210 mg/kg, and 0.1330–0.0124 mg/kg. The overall operating costs for producing 1.0 g L−1 d−1 of dry algal biomass with the existing PBR system were $0.12–0.35 L−1 d−1, $0.10–0.26 L−1 d−1, and $0.11–0.24 L−1 d−1 for Scenedesmus sp., Ankistrodesmus sp., and Synechococcaceae, respectively. The operating cost of producing 1.0 g L−1 d−1 of protein was in the range of $0.25–0.88 L−1 d−1 for the three algae species. The results provide insights into the potential of algae as a sustainable feed ingredient in animal diets, emphasizing both environmental and economic considerations. The results demonstrated a considerable reduction in the production costs of dry biomass and protein when utilizing poultry house exhaust air, highlighting the economic viability and nutritional benefits of this cultivation method.

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Section: Resultsmentioning

confidence: 99%

Pollutant Gases to Algal Animal Feed: Impacts of Poultry House Exhaust Air on Amino Acid Profile of Algae

Uguz,

Sozcu

2024

Animals

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“…It is essential to determine the optimum cultivation conditions, favorable or merely tolerable for the growth of microalgal species. Cultivation under unfavorable conditions could either increase or decrease the microalgal growth and carbohydrate content [21,22]. The most common cultivation conditions such as the surrounding temperatures, light intensity, pH, and CO 2 concentration have reported that these cultivation parameters can significantly influence the microalgal growth and carbohydrate accumulation in microalgal biomass during cultivation [23].…”

Section: Strategy To Improve Microalgal Carbohydrate Accumulationmentioning

confidence: 99%

Microalgal biorefinery: Challenge and strategy in bioprocessing of microalgae carbohydrate for fine chemicals and biofuel

Meng¹,

Harun²,

Kamaludin³

2021

J App Biol Biotech

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Microalgal carbohydrate is one of the major macromolecule metabolites, which has recently gained great attention as an alternative feedstock for wide-range sustainable biobased products. These biopolymers can act as a chemical platform for the production of biofuels through a biochemical conversion process. However, low microalgal carbohydrate productivity at a large-scale production has become a major problem for economical biofuel production. Several strategies have been proposed and the approach only increased carbohydrate content but reduced the microalgal biomass production, resulting in low microalgal carbohydrate productivity. Besides, the inappropriate pretreatments and fermentation approaches specifically with high-energy techniques could cause an increase in the cost of biofuel production. This present review gives a comprehensive discussion on microalgal carbohydrate enhancement strategies via cultivation techniques including the influence of environmental stress on the microalgal biomass and carbohydrate productivity. This paper also reviews the state of art on downstream processing of microalgal biomass prior to the hydrolysis and fermentation process. The different fine chemicals such as bioethanol, biobutanol, and biohydrogen production from microalgal carbohydrate are also discussed. The information from this review provides a framework for bioconversion of microalgal carbohydrate for biofuel and fine chemicals. This production could be beneficial for potential industrial implementation.

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“…It is known that microalgal lipids from microalgae can be used to produce biodiesel via transesterification. Meanwhile, the carbohydrate of the microalgae can be used as reducing sugar feedstock to produce a wide range of fine chemicals through fermentation [16]. The high carbohydrate content in the T. suecica biomass exhibits potential to be used as a feedstock for biofuel or fine chemical feedstock through fermentation.…”

Section: Chemical Compositionmentioning

confidence: 99%

“…Hence, this study was designed to enhance the enzymatic hydrolysis of pretreated T. suecica biomass at high solid concentration. The marine water T. suecica was selected for this study because this microalgae species has a great potential to be used in dual application CO 2 capture and fine chemical production [16,17]. Initially, different pretreatment approaches, i.e.…”

Section: Introductionmentioning

confidence: 99%

Alkaline-assisted Microwave Pretreatment of Tetraselmis suecica Biomass for Fed-batch Enzymatic Hydrolysis

Kassim

Meng

Serri

2019

J. Eng. Technol. Sci.

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A two-part study on pretreatment and fed-batch enzymatic hydrolysis of pretreated Tetraselmis suecica using a high initial biomass concentration was conducted. First, the effect of different pretreatment processes, i.e. microwave (MC), dilute alkaline (AK), and microwave-alkaline assisted (MAK) pretreatment, on enzymatic hydrolysis of T. suecica biomass was evaluated. Furthermore, high initial biomass concentration enzymatic hydrolysis improvement via a fed-batch strategy was performed. Among the pretreatments tested, the MAK pretreatment produced the highest sugar concentration at 9.83 ± 0.24 mg/mL, corresponding to a conversion yield of up to 85.58% of carbohydrate content available in the pretreated biomass. The solid fraction generated after pretreatment was characterized using Fourier transform infrared (FTIR) spectroscopy. The FTIR analysis revealed a significant change in the functional hydroxyl and acetyl groups of the biomass, which is favorable for enzymatic hydrolysis. Introducing an initial microalgal biomass concentration beyond 15% (w/v) exhibited a low enzymatic hydrolysis yield. The fed-batch enzymatic hydrolysis strategy of the MAK pretreated T. suecica was further investigated by adding the substrate at different time intervals. The findings indicate that the fed-batch operation system could enhance sugar production and enzymatic hydrolysis yield one-fold.

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Towards Biorefinery Production of Microalgal Biofuels and Bioproducts: Production of Acetic Acid from the Fermentation of <i>Chlorella</i> sp. and <i>Tetraselmis suecica</i> Hydrolysates

Cited by 9 publications

References 28 publications

Pollutant Gases to Algal Animal Feed: Impacts of Poultry House Exhaust Air on Amino Acid Profile of Algae

Pollutant Gases to Algal Animal Feed: Impacts of Poultry House Exhaust Air on Amino Acid Profile of Algae

Microalgal biorefinery: Challenge and strategy in bioprocessing of microalgae carbohydrate for fine chemicals and biofuel

Alkaline-assisted Microwave Pretreatment of Tetraselmis suecica Biomass for Fed-batch Enzymatic Hydrolysis

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