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

Karim, Ahasanul and M., Amirul Islam and Zaied, Khalid and Yousuf, Abu and Khan, Md. Maksudur Rahman and Che Ku Mohammad Faizal, Che Ku Yahya (2021) Microbial lipid accumulation through bioremediation of palm oil mill effluent using a yeast-bacteria co-culture. Renewable Energy, 176. pp. 106-114. ISSN 0960-1481. (Published)

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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

Item Type:	Article
Uncontrolled Keywords:	Palm oil mill effluent, Lipid accumulation, Bioremediation, Co-culture, Bacillus cereus, Lipomyces starkeyi
Subjects:	T Technology > TP Chemical technology
Faculty/Division:	Faculty of Chemical & Natural Resources Engineering Institute of Postgraduate Studies
Depositing User:	P.M. Dr. Che Ku Mohammad Faizal Che Ku Yahya
Date Deposited:	10 Jun 2022 08:06
Last Modified:	10 Jun 2022 08:06
URI:	http://umpir.ump.edu.my/id/eprint/34094
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