The effects of alternative pretreatment strategies on anaerobic digestion and methane production from different algal strains

Bohutskyi, Pavlo; Betenbaugh, Michael J.; Bouwer, Edward J.

doi:10.1016/j.biortech.2013.12.095

Cited by 140 publications

(104 citation statements)

References 30 publications

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“…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. The differing BMP values of 0.265 and 0.38 L CH 4 g -1 VS reported for the diatom Thalassiosira weissflogii [38,43] could thus reflect whether the harvesting technique was able to cause frustule separation. Raceway material as used in the current trial was tested fresh and after freezing, however, and showed only a small increase in BMP value (unpublished data, University of Southampton).…”

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: Discussionmentioning

confidence: 99%

“…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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“…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. Thermal hydrolysis can also enhance methane productivity by 46-62 % (Alzate et al 2012).…”

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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“…The cell wall of microalgae can be composed of many different molecules. The structural components can (or may not) include crystalline or amorphous cellulose, hemicellulose, laminarin, sulphated polysaccharides (agar, carrageenan, alginate, fucoidan or ulvan), glycoproteins, CaCO 3 , (silica) [26]. In the literature, several experiments found a correlation of degree of disruption and cell wall composition.…”

Section: Discussionmentioning

confidence: 99%

“…Anaerobic digestion tests showed, that the methane yield doubled for 90 • C treated algae. In Reference [26], for Chlorella sp. and Nannochloropsis sp., the cell walls kept intact when hydrothermally treated at 120 • C for 30 min.…”

Section: Discussionmentioning

confidence: 99%

Hydrothermal Disintegration and Extraction of Different Microalgae Species

2018

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Abstract:For the disintegration and extraction of microalgae to produce lipids and biofuels, a novel processing technology was investigated. The utilization of a hydrothermal treatment was tested on four different microalgae species (Scenedesmus rubescens, Chlorella vulgaris, Nannochloropsis oculata and Arthorspira platensis (Spirulina)) to determine whether it has an advantage in comparison to other disintegration methods for lipid extraction. It was shown, that hydrothermal treatment is a reasonable opportunity to utilize microalgae without drying and increase the lipid yield of an algae extraction process. For three of the four microalgae species, the extraction yield with a prior hydrothermal treatment elevated the lipid yield up to six times in comparison to direct extraction. Only Scenedesmus rubescens showed a different behaviour. Reason can be found in the different cell wall of the species. The investigation of the differences in cell wall composition of the used species indicate that the existence of algaenan as a cell wall compound plays a major role in stability.

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The effects of alternative pretreatment strategies on anaerobic digestion and methane production from different algal strains

Cited by 140 publications

References 30 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

Hydrothermal Disintegration and Extraction of Different Microalgae Species

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