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Harvesting Microalgae, Chorella sp. by Using Dissolved Air Flotation with
Moringa Oleifera
Anis Nadirah Binti Saiful Bahri
Supervisor: Prof. Ir. Dr. Ahmad bin Jusoh
Bachelor of Technology (Environment)
School of Ocean Engineering
Universiti Malaysia Terengganu
Aquaculture is an important industry in Malaysia which produce large quantities of
organic matter that demand wastewater treatment. In this study, the optimum dosage
of coagulant, Moringa oleifera was determined for effective flocculation of freshwater
microalgae, Chorella sp. which acts as a binder to coagulate particulate. In addition,
the air flow rate was determined for maximum biomass removal efficiency of Chorella
sp. by dissolved air flotation. The absorbance of the sample was measured by using
UV-vis spectrophotometer (Shimadzu UV-1800) whereas turbidity of the sample was
measured using turbidity meter. The biomass removal efficiency was calculated from
the absorbance ratio. The result showed that optimization of coagulation-flocculation
was achieved when dosage of Moringa oleifera at 50 mg/L and the biomass removal
efficiency was achieved 81% by dissolved air flotation at air flow rate 20.684 kPa. This
proves that Moringa oleifera and dissolved air flotation have a great potential for
microalgae harvesting.
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