碩士 / 國立成功大學 / 環境工程學系碩博士班 / 100 / N-nitrosamines have become an important issue in drinking water science since they were identified as disinfection by- products (DBPs) in chloraminated waters. N-nitrosodimethylamine (NDMA) is the most frequently detected member of nitrosamines in drinking water. The risk that the chemical poses to consumer health seems to be much higher than that from chlorinated DBPs. Although the first report that documented the presence of NDMA in water appeared in the 1970s. NDMA was widely discovered in many finishd waters at the beginning of the 21st centry. Although the monitoring and formation potential of NDMA has been extensively studied, the formation potential of cyanobacteria during chloramination has never been systematically investigated. In this study, formation potential of NDMA during chloramination of two algae, four cyanobacteria and two cyanobacteria-laden reservoir waters is investigated. In addition, chloramination of 17 amino acids were also studid for the formation potential of NDMA.
Experimental results indicated that NDMA formed from chloramination of cyanobacteria and algae cells is more than that from chloramination with extracellular organic matter associated with cyanobacteria and algae. In the system, higher oxidant dose, longer contact time, and more cell numbers would produce more NDMA. For chloramination of amino acid, NDMA was detected for almost all the cases, with highest concentration for aspartic acid (92.8 ng/L). The results of cyanobacteria and algae cells were linked to the formation protential for selected cyanobacteria-laden reservoir waters, through calculation of cell number in cyanobacteria-laden reservoir waters and formation protential of dominant species. The calculated results for NDMA formation are comparable with those from experiments, indicating that cyanobacteria and algae cells are important precursors of NDMA. The methodology developed may be used to estimate the risk associated with NDMA for the water with significant amounts of cyanobacteria and algae.
| Identifer | oai:union.ndltd.org:TW/100NCKU5515012 |
| Date | January 2012 |
| Creators | Jing-HuaTzeng, 曾靖樺 |
| 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 | 100 |
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