Harvesting of the microalga nannochloropsis sp. by bioflocculation with mung bean protein extract

Ganesan Kandasamy, and Sitti Raehanah Muhamad Shaleh, (2017) Harvesting of the microalga nannochloropsis sp. by bioflocculation with mung bean protein extract. Applied Biochemistry and Biotechnology, 182 (2). pp. 586-597. ISSN 0273-2289

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Abstract

Harvesting microalgae from medium is a major challenge due to their small size and low concentrations. In an attempt to find a cost-effective and eco-friendly harvesting technique, mung bean (Vigna radiata) protein extract (MBPE) was used for flocculation of Nannochloropsis sp. The effects of parameters such as pH, flocculant dose, algae concentration, and mixing time were used to study the flocculation efficiency (FE) of MBPE. Optimum parameters of MBPE dosage of 20 mL L−1 and a mixing rate of 300 rpm for 6 min achieved a FE of >92% after 2 h of settling time. MBPE-aggregated microlga flocs were characterized by microscopy. Zeta potential values decreased with increasing flocculant dose, and the values obtained were −6.93 ± 0.60, −5.36 ± 0.64, and −4.44 ± 0.22 for doses of 10, 20, and 30 mL L−1, respectively. In conclusion, MBPE flocculants used in this study are safe, nontoxic, and pollution free, so they could be used for an effective, convenient, and rapid harvesting of microalgae in an eco-friendly approach. These methods are sustainable and could be applied in industrial scale for aquaculture nutrition.

Item Type: Article
Uncontrolled Keywords: Nannochloropsis sp. bioflocculation, Mung bean protein extract, Flocculant, Microalgae
Subjects: T Technology > TP Chemical technology
Divisions: SCHOOL > Borneo Marine Research Institute
Depositing User: Munira
Date Deposited: 20 Jun 2018 00:21
Last Modified: 20 Jun 2018 00:21
URI: http://eprints.ums.edu.my/id/eprint/20305

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