Managing nutrients and system operations for biofuel production from freshwater macroalgae

Yun, Jin‐Ho; Smith, Val H.; Pate, Ronald C.

doi:10.1016/j.algal.2015.05.016

Cited by 25 publications

(13 citation statements)

References 79 publications

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“…Reduction of the ash content of biomass also has a great impact on the transportation cost as well and will decrease the final product price. Yun et al studies proved that reducing the ash content of algal turf from 52 to 13% dry weight basis will highly affect the capital and operational cost of the facility lead to reduction in the final fuel price by approximately 23.5% …”

Section: Resultsmentioning

confidence: 99%

“…), downstream processing, nutrients cost and availability . Among these, nutrients cost and requirements, in particular concerning phosphorous and nitrogen, were found to be highly critical for large‐scale algal oil production . A typical algal biomass contains around 7 wt % nitrogen and 1 wt % phosphorous (dry‐basis) suggesting that application of fertilizers for large scale algal cultivation is likely inevitable .…”

Section: Introductionmentioning

confidence: 99%

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Integration of biofuels intermediates production and nutrients recycling in the processing of a marine algae

et al. 2016

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The cost‐effective production of liquid biofuels from microalgae is limited by several factors such as recovery of the lipid fractions as well as nutrients management. Flash hydrolysis, a rapid hydrothermal process, has been successfully applied to fractionate the microalgal biomass into solid biofuels intermediates while recovering a large amount of the nutrients in the aqueous phase (hydrolyzate) in a continuous flow reactor. The aim of the work is to enhance the quality of a high‐ash containing marine algae Nannochloropsis gaditana as biofuel feedstock while recycling nutrients directly for algae cultivation. Characterization of products demonstrated an increase in extractable lipids from 33.5 to 65.5 wt % (dry basis) while retaining the same fatty acid methyl ester profile, in addition to diminution of more than 70 wt % of ash compared to raw microalgae. Moreover, the hydrolyzate was directly used to grow a microalga of the same genus. © 2016 American Institute of Chemical Engineers AIChE J, 63: 1494–1502, 2017

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Integration of biofuels intermediates production and nutrients recycling in the processing of a marine algae

et al. 2016

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“…Because ORR is a bottleneck having slow reaction kinetics, and thus, efficiency of ORR depends heavily on the catalyst used [6][7][8]. It is also one of the obstacles in microbial fuel cells (MFCs) whose electron acceptor is oxygen, and the research of cathode catalysts has also become a hot spot [9]. In an MFC, electrochemically active bacteria attached to the anode electrode provide electrons while oxidizing organic matter, and the resulting electrons flow from the anode through a wire to the cathode producing an electric current.…”

Section: Introductionmentioning

confidence: 99%

Metallic Organic Framework-Derived Fe, N, S co-doped Carbon as a Robust Catalyst for the Oxygen Reduction Reaction in Microbial Fuel Cells

et al. 2019

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Oxygen reduction reaction (ORR) provides a vital role for microbial fuel cells (MFCs) due to its slow reaction kinetics compared with the anodic oxidation reaction. How to develop new materials with low cost, high efficacy, and eco-friendliness which could replace platinum-based electrocatalysis is a challenge that we have to resolve. In this work, we accomplished this successfully by means of a facile strategy to synthesize a metallic organic framework-derived Fe, N, S co-doped carbon with FeS as the main phase. The Fe/S@N/C-0.5 catalyst demonstrated outstandingly enhanced ORR activity in neutral PBS and alkaline media, compared to that of commercial 20% Pt-C catalyst. Here, we started-up and operated two parallel single-chamber microbial fuel cells of an air cathode, and those cathode catalysts were Fe/S@N/C-0.5 and commercial Pt-C (20% Pt), respectively. Scanning electron microscopy (SEM) elaborated that the Fe/S@N/C-0.5 composite did not change the polyhedron morphology of ZIF-8. According to X-ray diffractometry(XRD) curves, the main crystal phase of the resulted Fe/S@N/C-0.5 was FeS. The chemical environment of N, S, and Fe which are anticipated to be the high-efficiency active sites of ORR for MFCs were investigated by X-ray photoelectron spectroscopic(XPS). Nitrogen adsorption/desorption techniques were used to calculate the pore diameter distribution. In brief, the obtained Fe/S@N/C-0.5 material exhibited a pronounced reduction potential at 0.861 V (versus Reversible Hydrogen Electrode(RHE)) in 0.1M KOH solution and –0.03 V (vs. SCE) in the PBS solution, which both outperform the benchmark platinum-based catalysts. Fe/S@N/C-0.5-MFC had a higher Open Circuit Voltage(OCV) (0.71 V), stronger maximum power density (1196 mW/m2), and larger output voltage (0.47 V) than the Pt/C-MFC under the same conditions.

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“…In particular, the extensive application of chemical fertilizer facilitates accumulation of salts in agricultural fields, which in turn could lead to a positive feedback loop by necessitating an increased application of synthetic fertilizer (Yuge Zhang & Liang, 2006). Notably, industrial algal cultivation platforms require continuous provision of nutrient salts with some studies demonstrating the utilization of saline wastewater sources enriched with nitrogenous and phosphorus nutrients as growth media to drive down the costs of commercial operation of algal cultivation systems (Yun, Cho, Lee, Heo, et al, 2018; Yun, Smith, & Pate, 2015; Zhu et al, 2013). In addition, the direct application of salinity stress for algal cultivation systems has been demonstrated as an effective abiotic inducer of high lipid accumulation and an environmental barrier inhibiting the proliferation of undesirable alien invaders in cultivation systems (Church et al, 2017; Kakarla et al, 2018; Lee, Nam, Yang, Han, & Chang, 2016).…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, while high salinity stress could act as an effective method of crop protection in reducing freshwater cyanobacterial or ciliate contaminants, it was successfully demonstrated to facilitate algal harvesting by enlarging cellular diameter and increasing algal settling rates (Church et al, 2017; Lee et al, 2016; von Alvensleben, Stookey, Magnusson, & Heimann, 2013). Even though osmosensitivity of algal crops has been acknowledged (Flowers et al, 1977), there is thus a great industrial incentive to exploit algal diversity and especially high tolerance of some algal species to highly saline environment (Yun et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Transcriptomic responses associated with carbon and energy flows under high salinity stress suggest the overflow of acetyl-CoA from glycolysis and NADPH co-factor induces high lipid accumulation and halotolerance inChlorellasp. HS2

Yun

Pierrelée

Cho

et al. 2019

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1 stress suggest the overflow of acetyl-CoA from glycolysis and NADPH co-factor induces 2 high lipid accumulation and halotolerance in Chlorella sp. HS2 3 4 Abstract 32 Previously, we isolated Chlorella sp. HS2 (referred hereupon HS2) from a local tidal rock pool 33 and demonstrated its halotolerance and relatively high biomass productivity under different 34 salinity conditions. To further understand acclimation responses of this alga against high 35 salinity stress, we performed transcriptome analysis of triplicated culture samples grown in 36 freshwater and marine conditions at both exponential and stationary growth phases. De novo 37 assembly followed by differential expression analysis identified 5907 and 6783 differentially 38 expressed genes (DEGs) respectively at exponential and stationary phases from a total of 52770 39 transcripts, and the functional enrichment of DEGs with KEGG database resulted in 1445 40 KEGG Orthology (KO) groups with a defined differential expression. Specifically, the 41 transcripts involved in photosynthesis, TCA and Calvin cycles were downregulated, whereas 42 the upregulation of DNA repair mechanisms and an ABCB subfamily of eukaryotic type ABC 43 transporter was observed at high salinity condition. In addition, while key enzymes associated 44 with glycolysis pathway and triacylglycerol (TAG) synthesis were determined to be 45 upregulated from early growth phase, salinity stress seemed to reduce the carbohydrate content 46 of harvested biomass from 45.6 dw% to 14.7 dw% and nearly triple the total lipid content from 47 26.0 dw% to 62.0 dw%. These results suggest that the reallocation of storage carbon toward 48 lipids played a significant role in conferring the viability of this alga under high salinity stress, 49 most notably by remediating high level of cellular stress partially caused by ROS generated in 50 oxygen-evolving thylakoids. 51 52 Summary Statement 53 Redirection of storage carbon towards the synthesis of lipids played a critical role in conferring 54 the halotolerance of a Chlorella isolate by remediating excess oxidative stress experienced in 55 photosystems. 56 57

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Managing nutrients and system operations for biofuel production from freshwater macroalgae

Cited by 25 publications

References 79 publications

Integration of biofuels intermediates production and nutrients recycling in the processing of a marine algae

Integration of biofuels intermediates production and nutrients recycling in the processing of a marine algae

Metallic Organic Framework-Derived Fe, N, S co-doped Carbon as a Robust Catalyst for the Oxygen Reduction Reaction in Microbial Fuel Cells

Transcriptomic responses associated with carbon and energy flows under high salinity stress suggest the overflow of acetyl-CoA from glycolysis and NADPH co-factor induces high lipid accumulation and halotolerance inChlorellasp. HS2

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