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Magnetophoretic separation of microalgae by magnetite maghemite colloid /Selah Anak Jalak

Magnetophoretic separation ofmicroalgae by magnetite maghemite colloid_Selah Anak Jalak_K4_2011_875003827_NI

Abstract Di dalam kajian ini, cas permukaan dan juga graf pertumbuhan alga C. vulgaris telah dikaji bagi menentukan hari yang terbaik untuk menuai mikroalga ini. Cas permukaan bagi alga C. vulgaris telah di ukur berdasarkan pergerakan elektroforesis bagi alga ini dengan menggunakan Zetasizer Nano Series manakala kepekatan nya di ukur menggunakan UV-VIS Spectrophotometer. Degan mengambil kira kedua-dua cas permukaan dan juga graf pertumbuhan alga ini, hari yang terbaik untuk menuai alga ini ialah pada hari ke-10. Alga C. vulgaris telah dituai menggunakan kaedah “grafting to” dan juga kaedah “grafting from” oleh zarah koloid, dengan bantuan polimer polydiallyldimethylammonium,PDDA. Polymer PDDA yang mempunyai berat molekul yang terendah memberikan pemendapan alga yang terbaik. Kaedah “grafting to” didapati telah memisahkan alga C. vulgaris lebih efektif berbanding kaedah “grafting from”. Selain itu, bentuk zarah koloid juga mempengaruhi keberkesanan koloid ini untuk memisahkan alga C. vulgaris daripada mediumnya. Zarah koloid berbentuk batang memisahkan alga C. vulgaris daripada mediumnya dengan lebih berkesan berbanding zarah koloid berbentuk bulat. ___________________________________________________________________________________ In this study, the surface charge and the growth curve of C. vulgaris was measured to determine the suitable day to harvest these microalgae. Surface charge of C. vulgaris was measured in term of its electrophoretic mobility using Zetasizer Nano Series while the concentration of C. vulgaris was measured using UV-VIS Spectrophotometer. By taking account both the surface charge properties and the growth curve properties of these microalgae, the best day to harvest it was determined to be at day 10. C. vulgaris was then harvested using ‘grafting to’ and ‘grafting from’ method of colloid particles with polydiallyldimethylammonium, PDDA as a polymer. PDDA polymers with the lowest molecular weight favor the separation process the most. ‘Grafting to’ technique was found to be separating C. vulgaris more effectively compared to ‘grafting from’ technique. The shape of the colloid particles also affects the efficiency of this colloid to separate the C. vulgaris. Colloid particles with rod shape type gives more efficient separation of C. vulgaris compared to sphere shape.

Contributor(s): Selah Anak Jalak - Author Primary Item Type: Final Year Project Identifiers: Accession Number : 875003827 Language: English Subject Keywords: C. vulgaris ; microalgae ; Maghemite Colloid First presented to the public: 4/1/2011 Original Publication Date: 8/27/2020 Previously Published By: Universiti Sains Malaysia Place Of Publication: School of Chemical Engineering Citation: Extents: Number of Pages - 65 License Grantor / Date Granted:   / ( View License ) Date Deposited 2020-08-27 11:31:33.772 Submitter: Nor Hayati Ismail

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