Anaerobic co-digestion of microalgae Chlorella sp. and waste activated sludge

Wang, Meng; Sahu, Ashish Kumar; Rusten, B.; Park, Chul

doi:10.1016/j.biortech.2013.05.096

Cited by 158 publications

(68 citation statements)

References 33 publications

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“…Synergy effect of the WAS and C. sorokiniana co-digestion was clearly shown with these results. In a similar way, Wang et al [16] also obtained calculated biogas yields for different mixtures of WAS and the microalga Chlorella sp. with the assumption that biogas generation by WAS alone and algae alone can be applied to co-digestion with their different mass compositions.…”

Section: Resultsmentioning

confidence: 91%

“…These authors obtained 23% higher biogas yield compared to the calculated value for the 41% algal addition (VS basis) set, demonstrating also this synergic 8 effect. [16] These results mean that more efficient bioenergy harvesting from microalgae could be achieved when microalgae is co-digested with WAS. However, this synergy trend was not observed when microalgae and undigested sewage sludge were co-digested at thermophilic conditions (55 ºC).…”

Section: Resultsmentioning

confidence: 97%

“…Codigestion mixtures with 4% and 11% of this alga have also significantly improved the dewatering rate than control digesters that processed only WAS or Chlorella. [16] The methane yields observed for each co-digestion mixture ( Figure 1) were compared to calculated or theoretical methane yields based on the WAS and C. sorokiniana methane yields separately according to the Equation (1):…”

Section: Resultsmentioning

confidence: 99%

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Batch anaerobic co-digestion of waste activated sludge and microalgae (Chlorella sorokiniana) at mesophilic temperature

Beltrán

Jeison

Fermoso

2016

Journal of Environmental Science and Health, Part A

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The microalgae Chlorella sorokiniana was used as co-substrate for waste activated sludge (WAS) anaerobic digestion in order to increase process stability, biodegradability and methane yield. Different co-digestion mixtures (0% WAS-100% microalgae; 25% WAS-75% microalgae; 50% WAS-50% microalgae; 75% WAS-25% microalgae; 100% WAS-0% microalgae) were studied. The highest methane yield (442 mL CH4/g VS) was obtained for the mixture 75% WAS-25% microalgae. This value was 22% and 39% higher than that obtained in the anaerobic digestion of the alone substrates WAS and microalgae, respectively, as well as 16% and 25% higher than those obtained for the co-digestion mixtures 25% WAS-75% microalgae and 50% WAS-50% microalgae, respectively. The kinetic constant of the process increased 42%, 42% and 12% for the mixtures with 25%, 50% and 75% of WAS compared to the substrate without WAS. Anaerobic digestion of WAS, together with Chlorella, has been clearly improved by ensuring its viability, suitability and efficiency.

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Section: Resultsmentioning

confidence: 91%

Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 99%

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Batch anaerobic co-digestion of waste activated sludge and microalgae (Chlorella sorokiniana) at mesophilic temperature

Beltrán

Jeison

Fermoso

2016

Journal of Environmental Science and Health, Part A

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“…and Scenedesmus sp. cultures (Costa et al 2012;Zhong et al 2012;Dębowski et al 2013;Wang et al 2013).…”

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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“…Microalgae cultivation have nowadays gained high attention in the field of renewable energy because of their potential to produce large quantities of biomass, resistance to pollution, less water uptake and land requirement and higher bioenergy yield compared to terrestrial biofuel crops [6,7]. Microalgae biomass can be converted into many biofuels such as biodiesel from cells lipids, hydrogen derived from photobiological processes, heat form direct combustion and biogas produced during anaerobic digestion [8,9].…”

Section: Introductionmentioning

confidence: 99%

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

Dębowski

Szwaja

Zieliński

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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Anaerobic co-digestion of microalgae Chlorella sp. and waste activated sludge

Cited by 158 publications

References 33 publications

Batch anaerobic co-digestion of waste activated sludge and microalgae (Chlorella sorokiniana) at mesophilic temperature

Batch anaerobic co-digestion of waste activated sludge and microalgae (Chlorella sorokiniana) at mesophilic temperature

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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