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Microbial lipid accumulation through bioremediation of palm oil mill effluent using a yeast-bacteria co-culture

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  • Karim, Ahasanul
  • Islam, M. Amirul
  • Khalid, Zaied Bin
  • Yousuf, Abu
  • Khan, Md. Maksudur Rahman
  • Mohammad Faizal, Che Ku

Abstract

Co-cultures of different microorganisms are considered promising inocula for treating palm oil mill effluents (POME) and producing value-added bio-products (e.g., biofuels and fatty acid-derived materials). However, the efficiency of yeast-bacteria co-culture for microbial lipid production through bioremediation of wastewater remains a bottleneck. In this study, the performance of a co-culture for lipid accumulation through POME bioremediation was investigated using a yeast (Lipomyces starkeyi) and a bacterium (Bacillus cereus). A maximum biomass of 8.89 ± 0.33 g/L and lipid production of 2.27 ± 0.10 g/L were achieved by the co-culture inoculum, which were substantially higher than those of the monocultures. Besides, the co-culture inoculum attained a maximum chemical oxygen demand (COD) removal of 83.66 ± 1.9%, while the individual cultures of B. cereus and L. starkeyi obtained 74.35 ± 1.7% and 69.01 ± 2.3%, respectively. The bioremediation efficiency was confirmed by the seed germination index (GI) of Vigna radiata (Mung bean). It was observed that the co-culture inoculum had a higher GI compared to the untreated POME and even the monoculture-treated POME. We argue that the symbiotic association of a yeast-bacteria co-culture in POME could be an attractive approach for achieving maximum biomass as well as lipid production and simultaneous bioremediation of POME.

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  • Karim, Ahasanul & Islam, M. Amirul & Khalid, Zaied Bin & Yousuf, Abu & Khan, Md. Maksudur Rahman & Mohammad Faizal, Che Ku, 2021. "Microbial lipid accumulation through bioremediation of palm oil mill effluent using a yeast-bacteria co-culture," Renewable Energy, Elsevier, vol. 176(C), pages 106-114.
    • Handle: RePEc:eee:renene:v:176:y:2021:i:c:p:106-114
    DOI: 10.1016/j.renene.2021.05.055
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    1. Antonopoulou, Io & Spanopoulos, Athanasios & Matsakas, Leonidas, 2020. "Single cell oil and ethanol production by the oleaginous yeast Trichosporon fermentans utilizing dried sweet sorghum stalks," Renewable Energy, Elsevier, vol. 146(C), pages 1609-1617.
    2. Pirozzi, Domenico & Fiorentino, Nunzio & Impagliazzo, Adriana & Sannino, Filomena & Yousuf, Abu & Zuccaro, Gaetano & Fagnano, Massimo, 2015. "Lipid production from Arundo donax grown under different agronomical conditions," Renewable Energy, Elsevier, vol. 77(C), pages 456-462.
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    4. Dong, Tao & Knoshaug, Eric P. & Pienkos, Philip T. & Laurens, Lieve M.L., 2016. "Lipid recovery from wet oleaginous microbial biomass for biofuel production: A critical review," Applied Energy, Elsevier, vol. 177(C), pages 879-895.
    5. Miao, Zhengang & Tian, Xuemei & Liang, Wenxing & He, Yawen & Wang, Guangyuan, 2020. "Bioconversion of corncob hydrolysate into microbial lipid by an oleaginous yeast Rhodotorula taiwanensis AM2352 for biodiesel production," Renewable Energy, Elsevier, vol. 161(C), pages 91-97.
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    1. Zarifeh Raji & Ahasanul Karim & Antoine Karam & Seddik Khalloufi, 2023. "Adsorption of Heavy Metals: Mechanisms, Kinetics, and Applications of Various Adsorbents in Wastewater Remediation—A Review," Waste, MDPI, vol. 1(3), pages 1-31, September.
    2. Sundaramahalingam, M.A. & Sivashanmugam, P., 2023. "Concomitant strategy of wastewater treatment and biodiesel production using innate yeast cell (Rhodotorula mucilaginosa) from food industry sewerage and its energy system analysis," Renewable Energy, Elsevier, vol. 208(C), pages 52-62.

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