Journal
JOURNAL OF ENVIRONMENTAL MANAGEMENT
Volume 249, Issue -, Pages -Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jenvman.2019.109373
Keywords
Microalgae; Filamentous fungus; Bio-harvesting; Bio-flocculant; Aquaculture wastewater
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Funding
- Ministry of Higher Education Malaysia, through the Fundamental Research Grant Scheme (FRGS) 2014
- Institute of Tropical Aquaculture, Universiti Malaysia Terengganu
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Microalgae have been increasingly used to generate biofuel, thus a sustainable technique should be implemented to harvest the biomass to ensure its existence in the environment. Aspergillus niger was used as bio-flocculant to harvest microalgae from aquaculture wastewater via flocculation technique over a range of pH and mixing rate. The bio-flocculant showed ability to adapt at a wide range of pH from 3.0 to 9.0 and at a mixing rate of 100-150 rpm, producing a harvesting efficiency of higher than 90%. The treated water possessed low concentration of chlorophyll-a (0.3-0.6 mg L-1) and cell density (2 x 10(6) -3 x 10(6) cell mL(-1)). These indicate that Aspergillus niger is a promising bio-flocculant to be used in harvesting microalgae, thus promoting the use of flocculation as a green technology in aquaculture wastewater treatment.
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