Evaluation of novel thermo-resistant Micractinium and Scenedesmus sp. for efficient biomass and lipid production under different temperature and nutrient regimes

Sönmez, Çağla; Elçin, Evrim; Akın, Dilan; Öktem, Hüseyin Avni; Yucel, Meral

doi:10.1016/j.biortech.2016.03.125

Cited by 23 publications

(12 citation statements)

References 27 publications

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“…Temperature is one of the most important environmental factors determining microalgal growth, which strongly affects the biomass, lipid productivity, and lipid composition of microalgae, and the effects of temperature are species dependent [14, 15]. So far, raceway ponds and tubular photobioreactors have been widely used to culture microalgae in a large scale [16, 17].…”

Section: Introductionmentioning

confidence: 99%

Molasses wastewater treatment and lipid production at low temperature conditions by a microalgal mutant Scenedesmus sp. Z-4

Wen

Xing

et al. 2017

Biotechnol Biofuels

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BackgroundSimultaneous wastewater treatment and lipid production by oleaginous microalgae show great potential to alleviate energy shortage and environmental pollution, because they exhibit tremendous advantages over traditional activated sludge. Currently, most research on wastewater treatment by microalgal are carried out at optimized temperature conditions (25–35 °C), but no information about simultaneous wastewater treatment and lipid production by microalgae at low temperatures has been reported. Microalgal growth and metabolism will be inhibited at low temperature conditions, and satisfactory wastewater treatment performance will be not obtained. Therefore, it is critical to domesticate and screen superior microalgal strains with low temperature adaptability, which is of great importance for wastewater treatment and biodiesel production.ResultsIn this work, simultaneous wastewater treatment and lipid production were achieved by a microalgal mutant Scenedesmus sp. Z-4 at the low temperature conditions (4, 10, and 15 °C). The results showed that algal growth was inhibited at 4, 10, and 15 °C compared to that at the optimal temperature of 25 °C. However, decreased temperature had no significant effect on the total cellular lipid content of algae. Importantly, lipid productivity at 10 °C was compromised by more net energy output relevant to biodiesel production, which demonstrated that the low temperature of 10 °C was favorable to wastewater treatment and energy recovery by Scenedesmus sp. Z-4. When molasses wastewater with optimal COD concentration of 8000 mg L−1, initial inoculation ratio of 15%, and C/N ratio of 15 was used to cultivate microalgae, the maximum removal rate of COD, TN, and TP at 10 °C reached 87.2, 90.5, and 88.6%, respectively. In addition, lipid content of 28.9% and lipid productivity of 94.4 mg L−1 day−1 were obtained.Conclusions Scenedesmus sp. Z-4 had good adaptability to low temperature conditions, and showed great potential to realize simultaneous wastewater treatment and lipid production at low temperatures. The proposed approach in the study was simple compared to other wastewater treatment methods, and this potential novel process was still efficient to remove COD, N, and P at low temperatures. Thus, it had a vital significance for the wastewater treatment in low temperature regions.Electronic supplementary materialThe online version of this article (doi:10.1186/s13068-017-0797-x) contains supplementary material, which is available to authorized users.

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Section: Introductionmentioning

confidence: 99%

Molasses wastewater treatment and lipid production at low temperature conditions by a microalgal mutant Scenedesmus sp. Z-4

Wen

Xing

et al. 2017

Biotechnol Biofuels

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“…Qiao et al also observed that the relative contents of saturated fatty acids (SFAs) and monounsaturated fatty acids (MUFAs) significantly increases, and a decrease in polyunsaturated fatty acids (PUFAs) was detected in the Phaeodactylum tricornutum under N‐limitation condition. In work by Sonmez et al with Micractinium sp ., most GLA (18:3 ω‐6), and ALA (18:3 ω‐6) was converted into stearic acid (18:0) and oleic acid (18:1) at both 1.5 and 3.5 days post‐inoculation with the influence of N‐ and P‐limitation. Additionally, the large variability in the response of diatoms relates to silicate availability.…”

Section: Microalgal Lipid Composition and Selection Of Species For Edmentioning

confidence: 99%

Edible Oil Production From Microalgae: A Review

Zhao-hui

Wan

et al. 2018

Euro J Lipid Sci & Tech

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Microalgae are considered an interesting candidate for the sustainable production of edible oils. Because microalgae contain abundant polyunsaturated fatty acids (PUFA) and have high photosynthetic rates and high oil productivity, they are superior to terrestrial oleaginous crops for producing edible oils. Microalgae are cultivated in aquatic environments, and thus, oil extraction methods for microalgae must consider the influence of water. This paper provides an overview of the suitability of microalgal lipid compositions and proposes a selection of species for edible oil production. The numerous technologies currently available for pretreatment, wet extraction and the refining of edible oils from microalgae are collated and presented, with a primary focus on the key parameters influencing process performance. Furthermore, the paper presents a proposed solution for a microalgae integrated system for edible oil production, which is a possible future direction to develop an economical and environmentally friendly process for the resource utilization of microalgal biomass. Practical Application: Microalgae might be the most promising source of edible oils, with potential applications in food industrialization, due to its rich oil content and its characteristic fatty acid composition. The review provides a selection criterion of microalgal species to help researchers exploit microalgae to produce superior edible oils for human consumption. Various process parameters and wet extraction methods are discussed that may be conducive to improving process performance and achieving high oil recovery yields. By considering the maximum utilization of microalgal biomass, an integrated system in this review would assist in economical production during further studies. Microalgae are the most promising candidates for edible oil production. Cell disruption, extraction, and refining are important processes for microalgal oils and on this basis, wet extraction and resource utilization can further promote the economic feasibility of microalgal process.

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“…Microalgae have the potential to accumulate as much as 30%-70% of their cellular dry weight as lipid under various conditions [7]. One of the key factors that can potentially influence cellular lipid accumulation is temperature [16,17]. However, the adaptability of microalgae to different temperature regimes is species dependent and the prospective biotechnological applications of thermophilic (>50 • C) or even mesophilic (30-50 • C) microalgae are only poorly developed.…”

Section: Introductionmentioning

confidence: 99%

Isolation and Characterization of Microalgae from Diverse Pakistani Habitats: Exploring Third-Generation Biofuel Potential

et al. 2019

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Production of microalgae as feedstock for biofuels must deal with a number of challenges including constraints imposed by local conditions. One solution is to use indigenous strains adapted to local climatic conditions. The present report describes the isolation, identification, and characterization of 32 microalgal strains from different ecological habitats: desert freshwater channels, northern region, and saline regions of Pakistan. The effects of temperature on algal growth rates, biomass productivity, and lipid content were determined through growth at 12, 20, and 35 °C for 15 days under 2% CO2 Responses to temperature varied among species with 20 °C being the optimum temperature in general, although, exceptionally, the best overall growth rate was found for strain S29 (0.311 d−1) at 12 °C. In some cases high biomass productivity was observed at 35 °C, and, depending upon the strain, the maximum lipid content was obtained at different temperatures, including 12 °C. Fatty acid methyl ester (FAME) analysis showed that the major fatty acids present were palmitic, stearic, oleic, linoleic, and linolenic. Oleic acid (C18:1) was the predominant fatty acid, with the specific FAME profile varying with strain. Thus, there is a rich diversity of microalgal strains native to Pakistan, some of which, characterized here, could be suitable for biodiesel production or other biotechnological applications.

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Evaluation of novel thermo-resistant Micractinium and Scenedesmus sp. for efficient biomass and lipid production under different temperature and nutrient regimes

Cited by 23 publications

References 27 publications

Molasses wastewater treatment and lipid production at low temperature conditions by a microalgal mutant Scenedesmus sp. Z-4

Molasses wastewater treatment and lipid production at low temperature conditions by a microalgal mutant Scenedesmus sp. Z-4

Edible Oil Production From Microalgae: A Review

Isolation and Characterization of Microalgae from Diverse Pakistani Habitats: Exploring Third-Generation Biofuel Potential

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