Influence of mechanical and thermochemical pretreatments on anaerobic digestion ofSpirulina maxima algal biomass

Samson, Réjean; LeDuy, Anh

doi:10.1007/bf01386360

Cited by 69 publications

(36 citation statements)

References 6 publications

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“…Thermal pretreatment exhibited the best results as indicated by Chen and Oswald in previous studies, where methane formation efficiency was improved by up to 33% [11]. Ultrasonic treatment improved substrate solubility, whereas a negative effect on specific biogas production was observed as indicated by Samson and LeDuy for Spirulina maxima algal biomass [12]. The effect was explained by changes in the chemical composition of the culture media due to cell disruption.…”

Section: Discussionmentioning

confidence: 64%

“…Experimental conditions were optimized according to different sources (e.g. protein purification, lipid extraction), since less data for pretreatment of algae in biogas fermentation is available [11][12][13][14]. The influence of temperature was examined by freezing over night at -15°C, heating for 8 hours at 100°C in a compartment dryer (Function line, Heraeus) and by microwave heating (five times until boiling at 600 W and 2450 MHz; Inverter Grill, Panasonic).…”

Section: Cell Disruptionmentioning

confidence: 99%

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Influence of Different Cell Disruption Techniques on Mono Digestion of Algal Biomass

Schwede¹,

Kowalczyk²,

Gerber³

2011

Linköping Electronic Conference Proceedings

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Due to high growth rates microalgae provide an enormous potential as a source for biomass besides conventional energy crops. The algal biomass can be used for bioenergy production. Anaerobic digestion to biogas is one of the most energy-efficient and environmentally beneficial technologies for alternative energy carrier production. The resistance of the algal cell wall is generally a limiting factor for cell digestibility. In the present work different cell disruption techniques (microwave heating; heating for 8 hours at 100°C; freezing over night at -15°C; French press; ultrasonic) on algal biomass of Nannochloropis salina were carried out. The disrupted material was digested to biogas in batch experiments according to VDI 4630. The results indicate that hydrolysis of algal cells is the rate-limiting step in anaerobic digestion of algal biomass. Cell disruption by heating, microwave and French press show a considerable increase in specific biogas production and degradation rate. Compared to the untreated sample the specific biogas production was increased for the heating approach by 58 %, for the microwave by 40 % and for the French press by 33 %.

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Section: Discussionmentioning

confidence: 64%

Section: Cell Disruptionmentioning

confidence: 99%

Influence of Different Cell Disruption Techniques on Mono Digestion of Algal Biomass

Schwede¹,

Kowalczyk²,

Gerber³

2011

Linköping Electronic Conference Proceedings

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“…Harvesting and storage methods may themselves act as pre-treatments [48,51], with both freezing and centrifugation potentially capable of rupturing cells and thus leading to increased methane yields or improved production kinetics. T. pseudonana has a solid silica cell wall consisting of two frustules, which can open during centrifugation: this may have contributed to the high values for BMP and for TMP conversion on a VS basis compared to those for the micro-algae with organic cell walls in the current study.…”

Section: Discussionmentioning

confidence: 99%

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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“…The resulting higher solubility of the biomass entailed a positive effect for the acid forming bacteria. The methanogenic bacteria, however, appeared to be only influenced by the chemical composition of the culture medium (Samson and Leduy, 1983a). Good results were obtained with a thermochemical pretreatment at 1008C for 8 h without NaOH, which could increase the efficiency of methane fermentation with 33%, up to 0.32 m 3 kg À1 VS (Chen and Oswald, 1998).…”

Section: à3mentioning

confidence: 92%

“…A loading rate of 2.9 kg algal-VS m À3 day À1 could be reached. The anaerobic digestion of Spirulina maxima resulted in a biogas yield of 0.3-0.37 m 3 biogas kg À1 VS, with 70% methane and conversion efficiencies up to 48% (Samson and Leduy, 1982, 1983a,b, 1986. Maximum yields were obtained with a retention time of 30 days and an algal concentration of 20 kg VS m…”

mentioning

confidence: 99%

Revival of the biological sunlight‐to‐biogas energy conversion system

Schamphelaire

Verstraete

2009

Biotech & Bioengineering

195

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In the quest for renewable resources, algae are increasingly receiving attention. Their high growth rate, high CO(2) fixation and their lack of requirement for fertile soil surface represent several advantages as compared to conventional (energy) crops. Through their ability to store large amounts of oils, they qualify as a source for biodiesel. Algal biomass, however, can also be used as such, namely as a substrate for anaerobic digestion. In the present research, we investigated the use of algae for energy generation in a stand-alone, closed-loop system. The system encompasses an algal growth unit for biomass production, an anaerobic digestion unit to convert the biomass to biogas and a microbial fuel cell to polish the effluent of the digester. Nutrients set free during digestion can accordingly be returned to the algal growth unit for a sustained algal growth. Hence, a system is presented that continuously transforms solar energy into energy-rich biogas and electricity. Algal productivities of 24-30 ton VS ha(-1) year(-1) were reached, while 0.5 N m(3) biogas could be produced kg(-1) algal VS. The system described resulted in a power plant with a potential capacity of about 9 kW ha(-1) of solar algal panel, with prospects of 23 kW ha(-1).

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Influence of mechanical and thermochemical pretreatments on anaerobic digestion ofSpirulina maxima algal biomass

Cited by 69 publications

References 6 publications

Influence of Different Cell Disruption Techniques on Mono Digestion of Algal Biomass

Influence of Different Cell Disruption Techniques on Mono Digestion of Algal Biomass

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

Revival of the biological sunlight‐to‐biogas energy conversion system

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