碩士 / 國立臺灣科技大學 / 化學工程系 / 100 / This study aims to study the separation of algae by dispersed air flotation (DiAF) including effects of types of collectors, and pretreatment by using chitosan. Two types of algae were used in this study, they are Chlorella vulgaris and Scenedesmus obliquus. The characteristics of algae suspension were assessed using scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), zeta potential measurement, particle sizer, and wet chemical analysis, including dissolved organic carbon (DOC), protein, and polysaccharide.
It was observed that 22.5% of algae removal was achieved when 100 mg/l saponin was used, and 91.4% algae was removed when 60 mg/l CTAB was used. However, with the pretreatment (coagulation-flocculation) of the algae suspension, it can increase algae removal to 97.4%. When the dose of chitosan increased (0-20 mg/l of chitosan), the removal of algae cells and organic materials both increased. However, separation efficiency decreased when at chitosan dose high than 20 mg/l. There was no effect of characteristics of algae, including size and shape to the removal of algae by using DiAF. This chitosan-saponin system showed several benefits: enhanced cell recovery, utilization of natural biochemicals, and reduced amount of surfactant needed.
| Identifer | oai:union.ndltd.org:TW/100NTUS5342100 |
| Date | January 2012 |
| Creators | Agnes Kurniawati Harijanto, 譚夢琪 |
| Contributors | Jhy-Chern Liu, 劉志成 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | en_US |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 105 |
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