Effective Biological DeNOx of Industrial Flue Gas by the Mixotrophic Cultivation of an Oil-Producing Green Alga <i>Chlorella</i> sp. C2

Chen, Weixian; Zhang, Shanshan; Rong, Junfeng; Li, Xiang; Chen, Hui; He, Chenliu; Wang, Qiang

doi:10.1021/acs.est.5b04696

Cited by 41 publications

(25 citation statements)

References 47 publications

(101 reference statements)

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“…Another recent study focused on Chlorella sorokiniana to produce algal slurry-diesel emulsions using surfactant pack made of butanol, CTAB and span80 to reduce diesel engine emissions especially NOx [16]. Likewise, the scrubbing of industrial flue gases also made use of different species of microalgae inoculated into a liquid medium through which the flue gases pass and get sequestered to some extent [17][18][19][20]. However, there has been no study in particular which discusses microalgae-based cleansing of automobile exhaust gases without overhead and energy demanding till now.…”

Section: Introductionmentioning

confidence: 99%

RETRACTED ARTICLE: Phycoremediation of automobile exhaust gases using green microalgae: a twofold advantage for pollutant removal and concurrent biomass/lipid yields

Kandimalla¹,

Vatte²,

Bandaru³

2020

Sustain Environ Res

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In the present study, an effort has been made to sequester automobile exhaust gases from a petroleum based engine using microalgae Scenedesmus quadricauda. The automobile selected for the present study was a two wheeler motorcycle. S. quadricauda was subjected to un-suspended/attached non-enclosure cultivation onto a silicone matrix coated stainless steel pipe, protracted to the motorcycle silencer outlet through which, the exhaust gases passed out. The automobile exhaust gases initially contained 13% of carbon dioxide, 2.4% of carbon monoxide, 0.2% of nitric oxide, 0.08% of nitrogen dioxide, 0.1% of sulfur dioxide and 0.05% of sulfur trioxide concentrations, which were removed up to 62, 57, 65, 66, 64 and 65% respectively by S. quadricauda from the attached growth experiment. The present study results showed that the exhaust gases played a crucial role in inducing biomass and lipid yields up to ≥2 and ≥ 0.6 g L − 1 respectively. The tolerance of S. quadricauda to the exhaust gas components' toxicity and its efficiency in treating them followed by the biomass and lipid productivities were better than anticipated in the present study.

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Section: Introductionmentioning

confidence: 99%

RETRACTED ARTICLE: Phycoremediation of automobile exhaust gases using green microalgae: a twofold advantage for pollutant removal and concurrent biomass/lipid yields

Kandimalla¹,

Vatte²,

Bandaru³

2020

Sustain Environ Res

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“…Using microalgae for environmental purposes (CO 2 fixation, NOx, and wastewater treatment) has also attracted much attention recently, and some environmental factors could induce lipid accumulation [4–6]. Microalgal metabolic pathways are heavily influenced by the environment [7].…”

Section: Introductionmentioning

confidence: 99%

Comparative metabolic profiling of the lipid-producing green microalga Chlorella reveals that nitrogen and carbon metabolic pathways contribute to lipid metabolism

Chen

Zheng

Zhan

et al. 2017

Biotechnol Biofuels

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106

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Microalgae are a promising feedstock for biofuel production. Microalgal metabolic pathways are heavily influenced by environmental factors. For instance, lipid metabolism can be induced by nitrogen-limiting conditions. However, the underlying mechanisms of lipid biosynthesis are unclear. In this study, we analyzed the global metabolic profiles of three genetically closely related Chlorella strains (C1, C2, and C3) with significant differences in lipid productivity to identify the contributions of key metabolic pathways to lipid metabolism. We found that nitrogen obtained from amino acid catabolism was assimilated via the glutamate–glutamine pathway and then stored as amino acids and intermediate molecules (particularly proline, alanine, arginine, succinate, and gamma-aminobutyrate) via the corresponding metabolic pathways, which led to carbon–nitrogen disequilibrium. Excess carbon obtained from photosynthesis or glycolysis was re-distributed into carbon-containing compounds, such as glucose-6-phosphate, fructose-6-phosphate, phosphoenolpyruvate, lactate, citrate, 3-hydroxybutyrate, and leucine, and then diverted into lipid metabolism for the production of storage lipids via the gamma-aminobutyrate pathway, glycolysis, and the tricarboxylic acid cycle. These results were substantiated in the model green alga Chlamydomonas reinhardtii by analyzing various mutants deficient in glutamate synthase/NADH-dependent, glutamate synthase/Fd-dependent, glutamine synthetase, aspartate aminotransferase, alanine aminotransferase, pyruvate kinase, and citrate synthase. Our study suggests that not only carbon but also nitrogen assimilation and distribution pathways contribute to lipid biosynthesis. Furthermore, these findings may facilitate genetic engineering efforts to enhance microalgal biofuel production.Electronic supplementary materialThe online version of this article (doi:10.1186/s13068-017-0839-4) contains supplementary material, which is available to authorized users.

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“…In the past few decades, the extensive utilization and irreversible depletion of fossil fuels has led to global climate change, environmental pollution, health problems, and an energy crisis (Amaro et al, 2011 ; Chen et al, 2016 ). Biofuel, as a new, alternative, clean, and sustainable energy source, has attracted great interest from researchers, local governments, and international traders (Lam and Lee, 2012 ).…”

Section: Introductionmentioning

confidence: 99%

Improved Productivity of Neutral Lipids in Chlorella sp. A2 by Minimal Nitrogen Supply

Zhu

Chen

et al. 2016

Front. Microbiol.

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Nitrogen starvation is an efficient environmental pressure for increasing lipid accumulation in microalgae, but it could also significantly lower the biomass productivity, resulting in lower lipid productivity. In this study, green alga Chlorella sp. A2 was cultivated by using a minimal nitrogen supply strategy under both laboratory and outdoor cultivation conditions to evaluate biomass accumulation and lipid production. Results showed that minimal nitrogen supply could promote neutral lipid accumulation of Chlorella sp. A2 without a significant negative effect on cell growth. In laboratory cultivation mode, alga cells cultured with 18 mg L−1 d−1 urea addition could generate 74 and 416% (w/w) more neutral lipid productivity than cells cultured with regular BG11 and nitrogen starvation media, respectively. In outdoor cultivation mode, lipid productivity of cells cultured with 18 mg L−1 d−1 urea addition is approximately 10 and 88% higher than the one with regular BG11 and nitrogen starvation media, respectively. Notably, the results of photosynthetic analysis clarified that minimal nitrogen supply reduced the loss of photosynthetic capacity to keep CO2 fixation during photosynthesis for biomass production. The minimal nitrogen supply strategy for microalgae cultivation could promote neutral lipid accumulation without a significant negative effect on cell growth, resulting in a significant improvement in the lipid productivity.

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Effective Biological DeNOx of Industrial Flue Gas by the Mixotrophic Cultivation of an Oil-Producing Green Alga Chlorella sp. C2

Cited by 41 publications

References 47 publications

RETRACTED ARTICLE: Phycoremediation of automobile exhaust gases using green microalgae: a twofold advantage for pollutant removal and concurrent biomass/lipid yields

RETRACTED ARTICLE: Phycoremediation of automobile exhaust gases using green microalgae: a twofold advantage for pollutant removal and concurrent biomass/lipid yields

Comparative metabolic profiling of the lipid-producing green microalga Chlorella reveals that nitrogen and carbon metabolic pathways contribute to lipid metabolism

Improved Productivity of Neutral Lipids in Chlorella sp. A2 by Minimal Nitrogen Supply

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