碩士 / 國立成功大學 / 環境工程學系碩博士班 / 94 / Microcystins, their associated toxin producers, and a few algal metabolites in three typical drinking water systems were monitored and interpreted for their relationships in this study. Two conventional and one advanced water treatment plants (WTPs) were examined, in which Shi-Men WTP represents typical conventional processes, Tai-Lake WTP represents conventional processes with flotation and slow sand filtration, and Chen-Chin Lake (CCL) WTP represents advanced treatment processes. A liquid chromatography with both photo diode array (PDA) detector and mass spectrometer (MS) was employed for the analysis of five typical microcystins in both source water and process water in the three WTPs.
Long-term monitoring data for the source water of Shi-Men WTP, Mu-Dan reservoir, indicated that the concentrations of microcystins and another algal metabolites, 2-MIB, followed the trend that higher concentrations were present in warmer seasons. Strong correlations among 2-MIB concentration, microcystin concentration, and ambient temperature were found in the water samples collected from the reservoir.
Four intensive water sampling were conduced in Tai-Lake for detecting cyanobacteria, microcysis spp., chlorophyll-a, microcystins and 2-MIB concentrations. Most of the parameters measured varied significantly at different depths and different time, and only 2-MIB concentration remained almost constant. This may imply that 2-MIB was likely to uniformly distribute in the reservoir water. In addition, a good correlation between microcystis spp. and microcystins concentrations was found, indicating that the probable relationship between the toxins and their producers. In a few algal blooms observed in Tai-Lake, the microcystins concentration was as high as near 10 μg/L. The extracellular concentrations of total microcystins were between 11%-35%, suggesting that most of the toxins were cell-bound.
For the removal efficiency of microcystins in the three WTPs, about 66% in average were observed for Shi-Men WTP, 54-84 % were for Tai-Lake WTP, and around 85 to >90 % were for CCLWTP. The processes for particulate removal, including floatation and coagulation-sedimentation, can effectively remove cell-bound microcystins. The slow filtration unit and residual chlorine were the two important processes to remove dissolved microcystins.
| Identifer | oai:union.ndltd.org:TW/094NCKU5515013 |
| Date | January 2006 |
| Creators | Yu-Ting Su, 蘇郁婷 |
| Contributors | Tsair-Fuh Lin, 林財富 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 131 |
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