Microalgae cultivation in palm oil mill effluent (POME) for lipid production and pollutants removal

•Chlorella sorokiniana CY-1 outcompeted Chlorella vulgaris ESP-31 to grow in POME.•POME pretreatment using acid and heat improved biomass and lipid yields of CY-1.•CY-1 produced biomass (2.12 g L−1) and lipid yields (11.21%) in pretreated POME.•Pollutants removal efficiencies were 62.07% (TN), 47.09...

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Bibliographic Details
Published in:Energy conversion and management 2018-10, Vol.174, p.430-438
Main Authors: Cheah, Wai Yan, Show, Pau Loke, Juan, Joon Ching, Chang, Jo-Shu, Ling, Tau Chuan
Format: Article
Language:English
Subjects:
Algae
Biofuel
Biofuels
Biomass
Chlorella
Cultivation
Effluents
Feasibility studies
Lignin
Lipids
Microalgae
Palm oil
Palm oil mill effluent
Pollutant removal
Pollutants
Pretreatment
Reproduction
Sugar
Sustainability
Wastewater
Wastewater pollution
Water treatment
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Summary:•Chlorella sorokiniana CY-1 outcompeted Chlorella vulgaris ESP-31 to grow in POME.•POME pretreatment using acid and heat improved biomass and lipid yields of CY-1.•CY-1 produced biomass (2.12 g L−1) and lipid yields (11.21%) in pretreated POME.•Pollutants removal efficiencies were 62.07% (TN), 47.09% (COD) and 30.77% (TP). Microalgae cultivation in wastewaters has been identified as the solution for economical microalgae cultivation. This study investigated the feasibility of using POME for Chlorella sp. cultivation to yield biomass and lipids, as it generates massively in Malaysia which ranked world palm oil exporter. The optimal POME concentration and pretreatment strategy were applied to promote biomass and lipid productivities. Chlorella sorokiniana CY-1 attained maximal of 11.21% of lipid content with 2.12 g L−1 of biomass concentration when cultivation in acid-heat pretreated 30% (v/v) POME. This provides relatively higher yield than those reported values on POME. Pretreatment was found effective to enhance biomass productions, as it converts lignin in POME into reducing sugars to serve as the supplement. The pollutants removal efficiencies were 62.07% for TN, 47.09% for COD, and 30.77% for TP. This contributes towards greater feasibility in microalgae cultivation for biofuel productions and as well towards environmental sustainability.
ISSN:0196-8904
1879-2227
DOI:10.1016/j.enconman.2018.08.057