Anaerobic conversion of microalgal biomass to sustainable energy carriers – A review

Lakaniemi, Aino–Maija; Tuovinen, Olli H.; Puhakka, Jaakko A.

doi:10.1016/j.biortech.2012.08.096

Cited by 115 publications

(43 citation statements)

References 75 publications

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“…The two freshwater species had similar growth rates but methane productivity was affected by both the biomass yield and the BMP value: Scenedesmus sp. was not only poorly degradable, as also reported by others [26,43,44], but also had a lower VS/TS ratio in the harvested biomass. The same was true for the marine species I. galbana and Dunaliella sp., where the growth rates were similar but the VS of the Dunaliella sp.…”

Section: 4supporting

confidence: 82%

“…It is also notable that the BMP value for N. occulata was much lower than for Dunaliella sp., while the value for I. galbana was only 80% that of T. pseudonana: the four species achieved respectively 44.7, 60.7, 61.52 and 88.2% of their TMP values ( Table 2). The development of effective pre-treatments to enhance degradability is thus likely to have a major influence on the choice of species, especially given the variability of reported BMP values even for a single species [26,43,44].…”

Section: Discussionmentioning

confidence: 99%

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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: 4supporting

confidence: 82%

Section: Discussionmentioning

confidence: 99%

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

2016

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“…In a non-defined mixed culture of freshwater algae, the methane concentration of biogas varies between 40 and 65 % (De Schamphelaire and Verstraete 2009). In the case of the microalgae Chlorella spp., the methane yield ranges from 174 to more than 400 mL g −1 (Lakaniemi et al 2013). Bohutskyi et al (2014a) found that thermochemical pretreatment improved methane yield by 30-40 % from certain species.…”

Section: Introductionmentioning

confidence: 99%

Effect of co-substrate feeding on methane yield of anaerobic digestion of Chlorella vulgaris

et al. 2016

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Microalgal production has many advantages over the use of terrestrial plants; therefore, increases in the use of microalgae for energy production can be expected. Algal biomass can be processed anaerobically to methane; however, the unfavorable C/N ratio of the substrate may have an inhibitory effect. The impact of the application of used cooking oil, maize silage, and mill residue on anaerobic co-digestion of the microalgal Chlorella vulgaris was studied in semi-continuous, laboratory-scale digestion. During the full period of the trial involving anaerobic digestion of algae in the case of mono-digestion and co-digestion with used cooking oil, maize silage, and mill residue, the volumetric methane yields were 0.38 ± 0.07, 1.56 ± 0.26, 1.19 ± 0.18, and 1.16 ± 0.13 L L −1 , respectively. Trials were carried out to determine the long-term effect of the total solid (TS) content of substrates (co-digestion of C. vulgaris and used cooking oil at 3.8 and 7.2 % of TS, respectively). Both designs could be increased to 5.5 g VS L, but a higher TS% resulted in increased methane production and a longer period of decline in the methane yield due to washout. The sharp decrease in methane content at the end of 90 days was accompanied by a reorganization of the methanogenic archaeal community.

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“…Microalgal biomass with a high carbohydrate content is a feedstock of choice, since it yields higher fermentative H 2 production than biomass with a low-carbohydrate content [149]. The efficiency of the algal biomass fermentation depends on the microalgal strain chosen as a feedstock, mostly because of the protein-carbohydrate-lipid ratio of the cells, the presence and composition of the cell wall, and the pretreatment that needs to be applied to the biomass prior to use [150,154,155].…”

Section: Integration Of Diverse H 2 -Production Bioprocessesmentioning

confidence: 99%

Microalgal hydrogen production research

Eroğlu

Melis

2016

International Journal of Hydrogen Energy

118

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Available online xxxKeywords: Photobiological hydrogen Microalgae Metabolic engineering Cellular immobilization Integrated bioprocess Photobioreactor a b s t r a c tMicroorganisms can produce hydrogen biologically, with species ranging from photosynthetic and fermentative bacteria to green microalgae and cyanobacteria. In comparison with the conventional chemical or physical hydrogen production methods, biological processes demonstrate several advantages by operating at ambient pressure and temperature conditions, without a requirement for the use of precious metals to catalyze the reactions. In addition to using cellular endogenous substrate from which to extract electrons for H 2 -production, a number of green microalgae are also endowed with the photosynthetic machinery needed to extract electrons from water, the potential energy of which is elevated by two photochemical reactions prior to reducing protons (H þ ) for the generation of molecular hydrogen (H 2 ). Sunlight provides the energy for the microalgal overall strongly endergonic reaction of H 2 O-oxidation, electron-transport, and H 2 -production.Thanks to a substantial amount of research, a number of diverse experimental approaches have been developed and applied to establish and improve sustainable production of hydrogen. This review summarizes and updates recent developments in microalgal hydrogen production research with emphasis on new trends and novel ideas practiced in this field.

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Anaerobic conversion of microalgal biomass to sustainable energy carriers – A review

Cited by 115 publications

References 75 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

Effect of co-substrate feeding on methane yield of anaerobic digestion of Chlorella vulgaris

Microalgal hydrogen production research

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