TY - JOUR
T1 - Simultaneous nutrient removal and lipid production with Chlorella vulgaris on sterilized and non-sterilized anaerobically pretreated piggery wastewater
AU - Marjakangas, Jatta M.
AU - Chen, Chun Yen
AU - Lakaniemi, Aino Maija
AU - Puhakka, Jaakko A.
AU - Whang, Liang Ming
AU - Chang, Jo Shu
N1 - Funding Information:
Thanks for TUT’s Graduate School for funding the research exchange. Thanks also for Maj and Tor Nessling foundation, TUT foundation and A.R.Winter’s memorial foundation for travel grants. The authors also acknowledge the financial support received for this work from Taiwan’s Ministry of Science and Technology ( 104-3113-E-006-003 , 103-3113-E-006-006 & 103-2221-E-006-190-MY3 ). This work is also supported in part by the Taiwan’s Ministry of Education under the ATU plan.
Publisher Copyright:
© 2015 Elsevier B.V.
PY - 2015/11/5
Y1 - 2015/11/5
N2 - Piggery wastewater is a potent nutrient source for microalgal lipid production. Wastewater has been usually sterilized when used for microalgal cultivation. This is uneconomical in large-scale applications. Therefore, lipid productivity of Chlorella vulgaris CY5 using sterilized and non-sterilized diluted anaerobically pretreated piggery wastewater was studied in batch reactors. The maximum average lipid productivity was obtained after 12 days of incubation and it was higher with the sterilized wastewater than with the non-sterilized one (117g/L/d vs. 91.3g/L/d), due to the higher biomass concentration. Because of the unexpected increase of dissolved organic carbon (DOC) in the cultures, second experiment was conducted to characterize the composition of produced DOC in non-sterilized wastewater. Carbohydrate content increased in the liquid phase but decreased in the biomass after nitrogen had been exhausted. After 12 days of incubation, soluble chemical oxygen demand (CODs) was 414±56mg/L, biomass production was 2.8±0.15g/L, and lipid content was 30.3±1.2wt%. Average lipid productivity from day zero to day 12 was 70.5±1.1g/L/d. C. vulgaris removed nutrients from the non-sterilized wastewater and produced oleaginous biomass, although the lipid productivity was higher with sterilized wastewater.
AB - Piggery wastewater is a potent nutrient source for microalgal lipid production. Wastewater has been usually sterilized when used for microalgal cultivation. This is uneconomical in large-scale applications. Therefore, lipid productivity of Chlorella vulgaris CY5 using sterilized and non-sterilized diluted anaerobically pretreated piggery wastewater was studied in batch reactors. The maximum average lipid productivity was obtained after 12 days of incubation and it was higher with the sterilized wastewater than with the non-sterilized one (117g/L/d vs. 91.3g/L/d), due to the higher biomass concentration. Because of the unexpected increase of dissolved organic carbon (DOC) in the cultures, second experiment was conducted to characterize the composition of produced DOC in non-sterilized wastewater. Carbohydrate content increased in the liquid phase but decreased in the biomass after nitrogen had been exhausted. After 12 days of incubation, soluble chemical oxygen demand (CODs) was 414±56mg/L, biomass production was 2.8±0.15g/L, and lipid content was 30.3±1.2wt%. Average lipid productivity from day zero to day 12 was 70.5±1.1g/L/d. C. vulgaris removed nutrients from the non-sterilized wastewater and produced oleaginous biomass, although the lipid productivity was higher with sterilized wastewater.
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U2 - 10.1016/j.bej.2015.07.011
DO - 10.1016/j.bej.2015.07.011
M3 - Article
AN - SCOPUS:84939202209
SN - 1369-703X
VL - 103
SP - 177
EP - 184
JO - Biochemical Engineering Journal
JF - Biochemical Engineering Journal
ER -