Nutrient Removal From Sungai Pinang Basin Water Samples By Free And Immobilised Cells Of Scenedesmus bijugatus Kützing

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dc.contributor.authorWong, Swe Cheng
dc.date.accessioned2017-01-09T01:54:02Z
dc.date.available2017-01-09T01:54:02Z
dc.date.issued2016-09
dc.description.abstractGreen microalga Scenedesmus bijugatus was used to remove inorganic nutrients (phosphate, ammonium, nitrite and nitrate), by inoculating the cells into water samples collected from selected sampling sites along Sungai Pinang Basin with varying levels of pollution. This research studied the effects of inorganic nutrients removal by free and immobilised S. bijugatus cells through algal growth (chlorophyll a concentration) and the efficiency of free and immobilised cells in the uptake of inorganic nutrients (uptake rate (b) and removal (%)). Polluted and moderately polluted river water samples recorded a higher growth of S. bijugatus than clean river water samples. Among the six stations studied, the highest growth rate was recorded in Sungai Pinang estuary low tide water samples, with free cells treatment being the highest (0.285μg/mL/d) compared to immobilised cells (0.062μg/mL/d). Among the six river stations, the highest phosphate removal (%) by S. bijugatus was achieved by polluted river water samples; such as Air Itam downstream which recorded 90% removal for immobilised cells treatment while free cells treatment was about 40%. All moderately polluted and polluted river water samples showed high nitrogen removal, in the range of 80-100%, 80-90% and at least 50% removal for ammonium, nitrite and nitrate, respectively. Both inorganic nutrients removal and microalgal cells growth between free or immobilised S. bijugatus cells treatments were not significantly different (p>0.05). However, there were significant differences in the removals of inorganic nutrients and algal growth among the clean, moderately polluted and polluted river water stations (p<0.05), showing that, polluted water supports S. bijugatus growth more efficiently than clean water samples and in removing nutrients. Immobilisation treatment has been found to greatly affect phosphate removal from the medium through the chemical precipitation of beads matrix and phosphate ions. On the other hand, immobilisation (beads matrix absorption) only affected nitrogen removal to a limited extend, and the rest depends on the algal assimilation pathway. With these findings, immobilisation can be used to aid microalgae in efficiently removing inorganic nutrients, especially phosphate from organically polluted waters and will be a good candidate for bioremediation if further enhancement in the immobilisation techniques can be achieveden_US
dc.identifier.urihttp://hdl.handle.net/123456789/3348
dc.subjectThe effects of inorganic nutrients removal byen_US
dc.subjectfree and immobilised S. bijugatus cellsen_US
dc.titleNutrient Removal From Sungai Pinang Basin Water Samples By Free And Immobilised Cells Of Scenedesmus bijugatus Kützingen_US
dc.typeThesisen_US
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