Browsing by Author "Nurfarahana Mohd Nasir"

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    Optimization of biomass harvesting of microalgae, Chlorella sp. utilizing auto-flocculating microalgae, Ankistrodesmus sp. as bio-flocculant
    (International Biodeterioration and Biodegradation, 2016) Fathurrahman Lananan; Fareza Hanis Mohd Yunos; Nurfarahana Mohd Nasir; Nur Syuhada Abu Bakar; Su Shiung Lam; Ahmad Jusoh
    Current microalgae harvesting technology depends on sophisticated and complex approaches such as hollow fiber filtration, chemical flocculants and centrifugation, which are deemed feasible if high value products were obtained. In this study the potential of auto-flocculating microalgae Ankistrodesmus sp. was examined for its potential as bio-flocculant to harvest Chlorella sp. Zeta Potential Analysis was performed on the microalgae in the pH range of 4.16e9.55 before subjecting the microalgae to the coagulation e flocculation assay. The isoelectric point of microalgae suspension was observed in the range of pH 5e8 and the magnitude of zeta potentials ranged between 10 mv to 35 mV. Ankistrodesmus sp. was inoculated at a dosage of 50% (v/v) into a batch of Chlorella sp. culture during the coagulation e flocculation assay. The removal efficiency shown by Ankistrodesmus sp. was 82% at pH 7.1 followed by 55% at pH 6.2. Utilizing Ankistrodesmus sp. for flocculation was efficient since it did not require any changes of pH because isoelectric point was observed within the normal pH of Chlorella sp. growth condition. Development of innovative microalgae treatment technology incorporating continuous bio-harvesting with microalgae-microalgae flocculation could provide a low-cost and sustainable wastewater treatment approach. In addition, the use of microalgae itself to harvest microalgae biomass harvesting could simplify downstream processing, saving resources and would reduce the production cost for future microalgae-based technology.
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    Phycoremediation of aquaculture wasterwater by chlorella sp. and biomass recovery using aspergillur niger
    (Universiti Malaysia Terengganu, 2017-09) Nurfarahana Mohd Nasir
    Aquaculture is deemed one of the most important industry around the world. However, the continued growth of global aquaculture development has presented the industry with large production of organic waste and toxic compound that affect water bodies. Therefore, proper treatment is required to control the contaminant as the aquaculture waste can negatively impact the aquatic ecosystems. Microalgae, Chlorella sp. was selected because it is known as a very effective bio-absorbents aquatic microorganism in treating inorganic nutrients present in the wastewater. Thus, this study was initiated with evaluation of Chlorella sp. for its nutrient removal performance in aquaculture wastewater with its correlation with the kinetic growth of Chlorella sp.. Phycoremediation was then performed with various Chlorella sp. inoculation dosage of 10 – 60 % (v/v) of wastewater for a treatment period of 14 days. The results revealed that Chlorella sp. is promising for use in aquaculture wastewater treatment.