Biogasification of Marine Algae Nannochloropsis Oculata

Buxy, Samriddhi; Diltz, Robert; Pullammanappallil, Pratap

doi:10.1002/9781118585160.ch6

Cited by 16 publications

(10 citation statements)

References 22 publications

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“…The marine species I. galbana and T. pseudonna had the greatest apparent conversion efficiency of measured CV into methane, at 59.5% and 79.2% respectively, whereas the conversion efficiencies for N. occulata and the freshwater species were lower at 26.4% to 49.0% (Table 2). [40,42], and 0.204 L CH 4 g -1 VS for N. occulata [37].…”

Section: Bmp and Theoretical Energy Valuesmentioning

confidence: 94%

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Comparative testing of energy yields from micro-algal biomass cultures processed via anaerobic digestion

2016

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. Comparative testing of energy yields from microalgal biomass cultures processed via anaerobic digestion. Renewable Energy, 87,[744][745][746][747][748][749][750][751][752][753] http://www.sciencedirect.com/science/article/pii/S0960148115304286 doi:10.1016/j.renene.2015.11.009 __________________________________________________________________________________ Comparative testing of energy yields from micro-algal biomass cultures processed via anaerobic digestion Keiron P. Roberts, Sonia Heaven, Charles J. Banks Faculty of Engineering and the Environment, University of Southampton, Southampton, SO17 1BJ, UK (Email K.P. Roberts@soton.ac.uk, S.Heaven@soton.ac.uk, C.J.Banks@soton.ac.uk) Abstract Although digestion of micro-algal biomass was first suggested in the 1950s, there is still only limited information available for assessment of its potential. The research examined six laboratory-grown marine and freshwater micro-algae and two samples from large-scale cultivation systems. Biomass composition was characterised to allow prediction of potentially available energy using the Buswell equation, with calorific values as a benchmark for energy recovery. Biochemical methane potential tests were analysed using a pseudo-parallel first order model to estimate kinetic coefficients and proportions of readily-biodegradable carbon. Chemical composition was used to assess potential interferences from nitrogen and sulphur components. Volatile solids (VS) conversion to methane showed a broad range, from 0.161-0.435 L CH 4 g -1 VS; while conversion of calorific value ranged from 26.4-79.2%. Methane productivity of laboratory-grown species was estimated from growth rate, measured by changes in optical density in batch culture, and biomass yield based on an assumed harvested solids content. Volumetric productivity was 0.04-0.08 L CH 4 L -1 culture day -1 , the highest from the marine species Thalassiosira pseudonana. Estimated methane productivity of the large-scale raceway was lower at 0.01 L CH 4 L -1 day -1 . The approach used offers a means of screening for methane productivity per unit of cultivation under standard conditions.

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Section: Bmp and Theoretical Energy Valuesmentioning

confidence: 94%

“…Results and discussion [16,[37][38][39][40], but Zhu and Lee [41] also showed that the TS content of unwashed samples may be as much as 20% higher than washed cells. The value for N. occulata was similar to that reported in other studies [16].…”

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confidence: 99%

Comparative testing of energy yields from micro-algal biomass cultures processed via anaerobic digestion

2016

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“…For example, Botryococcus braunii produces hydrocarbons with excellent oil yield outside the cell which is more convenient for extraction [59]. In the presence of air, oxygen, or water vapor, bio-syngas is produced by the biomass gasification to give methane, hydrogen, carbon monoxide, water and ashes [60]. The gasification process requires a high temperature of 800-1200 • C. It is desirable that the biomass water content is below 20% [61].…”

Section: Algal Fuelsmentioning

confidence: 99%

Algal Biofuels: Current Status and Key Challenges

et al. 2019

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The current fossil fuel reserves are not sufficient to meet the increasing demand and very soon will become exhausted. Pollution, global warming, and inflated oil prices have led the quest for renewable energy sources. Algal biofuels represent a potential source of renewable energy. Algae, as the third generation feedstock, are suitable for biodiesel and bioethanol production due to their quick growth, excellent biomass yield, and high lipid and carbohydrate contents. With their huge potential, algae are expected to surpass the first and second generation feedstocks. Only a few thousand algal species have been investigated as possible biofuel sources, and none of them was ideal. This review summarizes the current status of algal biofuels, important steps of algal biofuel production, and the major commercial production challenges.

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“…N. oculata culture was cultivated in open raceways at Tyndall Air Force Base (AFB), Florida, at a concentration of 0.8-1 g/L [8]. N. oculata was dewatered to a thick slurry of 8% solids.…”

Section: A Feedstockmentioning

confidence: 99%

Enzymatic Saccharification of Dilute Acid Pretreated Saline Microalgae, Nannochloropsis Oculata

Buxy¹,

Diltz²,

Pullammanappallil³

2017

Proceedings of the 15th LACCEI International Multi-Conference for Engineering, Education, and Technology: “Global Partnership F

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In this study the saccharification potential of a marine microalgae, N. oculata, was evaluated by employing conventional techniques of hydrolysis and saccharification often used for lignocellulosic biomass. N.oculata was first hydrolyzed using dilute acids viz 5% (v/v) sulfuric acid, and 5% (v/v) and 2% (v/v) phosphoric acid at 160 C followed by enzymatic saccharification using commercial cellulases, EI or EII. Neither dilute acid hydrolysis nor enzymatic saccharification alone released any sugars. However, hydrolysates after acid hydrolysis were readily saccharified on addition of enzymes EI or EII. The extent of saccharification ranged between 8 and 100% in all experiments. Sulfuric acid hydrolysis produced furfurals whereas no side products were detected after phosphoric acid hydrolysis. Maximum sugar yield using EI was 345 g sugars/kg ash free dry matter (afdm) within 4 hours whereas EII yielded 360 g sugars/kg afdm within 12 hours. Twice of the nominal enzyme loading facilitated 35% more sugar release and half the nominal enzyme loading yielded 64% less sugars. It was concluded that conventional dilute phosphoric acid hydrolysis followed by enzymatic saccharification using commercially available enzymes could be efficient for saccharification of marine microalgae.

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Biogasification of Marine Algae Nannochloropsis Oculata

Cited by 16 publications

References 22 publications

Comparative testing of energy yields from micro-algal biomass cultures processed via anaerobic digestion

Comparative testing of energy yields from micro-algal biomass cultures processed via anaerobic digestion

Algal Biofuels: Current Status and Key Challenges

Enzymatic Saccharification of Dilute Acid Pretreated Saline Microalgae, Nannochloropsis Oculata

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