Efficient anaerobic digestion of whole microalgae and lipid-extracted microalgae residues for methane energy production

Zhao, Baisuo; Ma, Jingwei; Zhao, Qiang; Laurens, Lieve M.L.; Jarvis, Erin; Chen, Shulin; Frear, Craig

doi:10.1016/j.biortech.2014.03.079

Cited by 146 publications

(79 citation statements)

References 34 publications

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“…The value for N. occulata was similar to that reported in other studies [16]. Carbon content ranged from 43.7-54.2% on a VS basis.…”

supporting

confidence: 89%

“…Research on anaerobic digestion of micro-algal biomass goes back more than 50 years [6] and the subject has been revisited a number of times since then [7][8][9][10][11][12][13]. More recently digestion has been considered as a means of improving the overall energy balance of biodiesel production [14][15][16]; as a substrate for co-digestion to improve volumetric biogas yields in digestion of less favourable substrates [17,18], or with other carbon-rich wastes [19]; or as an adjunct to wastewater treatment [20,21].…”

Section: Introductionmentioning

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].…”

mentioning

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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“…The value for N. occulata was similar to that reported in other studies [16]. Carbon content ranged from 43.7-54.2% on a VS basis.…”

supporting

confidence: 89%

Section: Introductionmentioning

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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“…Most methane production trials have been carried out by batch digestion (Passos et al 2013;Zhao et al 2014), but semi-continuous feeding reactors have provided more information on sustainable operation and reliable methane yield (Bohutskyi and Bouwer 2013;Kolbl et al 2014).…”

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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“…Zhong et al [36] suggested an appropriate C/N ratio of 20 for co-digestion microalgae with corn silage. Similarly to our study, Zhao et al [37] reported an effective methane production from algae biomass having low C/N ratio ranged from 6.8 to 14.8.…”

Section: Composition Of Chlorella Sp Microalgae Cultivated On Adesmentioning

confidence: 55%

The Influence of Anaerobic Digestion Effluents (ADEs) Used as the Nutrient Sources for Chlorella sp. Cultivation on Fermentative Biogas Production

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et al. 2016

Waste Biomass Valor

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Purpose This study investigated the chemical characteristics and anaerobic digestion of Chlorella sp. microalgae cultivated on various anaerobic digestion effluents (ADEs) as a nutrient medium. Chlorella sp. was grown in anaerobically digested effluent of dairy wastewater (DW), municipal wastewater sludge (WS), maize silage and swine slurry, and cattle manure (CM). Methods To evaluate the anaerobic biodegradability of harvested biomass, 20-days batch anaerobic digestion experiments were used. Results It was found that a nutrient medium directly affected nitrogen concentration in the cultivated biomass, as well as the C/N ratio value which ranged 7.2-12.9. Higher C/N ratio of the Chlorella sp. cultivated on DW and WS significantly enhanced the methane production, which was 241 ± 5.5 mL CH 4 /g VS and 267 ± 10.9 mL CH 4 /g VS, respectively. The highest biogas production rate of 61.28 ± 2.7 mL/g VSÁd and methane concentration in biogas of 69.7 ± 4.1 % were obtained during the digestion of Chlorella sp. biomass cultivated on WS.Conclusions These results proved the applicability of ADEs as a nutrient medium for Chlorella sp. cultivation and the impact of a nutrient source on C/N ratio in harvested biomass, which subsequently affected the biogas/ methane yield.

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Efficient anaerobic digestion of whole microalgae and lipid-extracted microalgae residues for methane energy production

Cited by 146 publications

References 34 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

The Influence of Anaerobic Digestion Effluents (ADEs) Used as the Nutrient Sources for Chlorella sp. Cultivation on Fermentative Biogas Production

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