碩士 / 國立中興大學 / 環境工程學系所 / 102 / Lake eutrophication is an imperative environmental problem around the world. In recent years, algal bloom has become a serious threat to drinking water safety. Especially cyanobacteria in eutrophic water bodies produce not only odorous compounds but also lethal toxins. Microcystis aeruginosa is a common species of cyanobacteria which releases toxins named microcystin. In Taiwan, there are 35 major water reservoirs on isolated islands, in which 91.2 % of them have been identified as eutrophic. Methods of water treatment plant to removing Microcystis aeruginosa and microcystins include chemical methods and prechlorination in Taiwan. However, these methods easily result in harmful by-products, such as trihalogenated carbons. This study is aimed to reduce the impact of ertrophication by using nanomaterials for growth inhibition of Microcystis aeruginosa, decomposition of microcystin, and removal of phosphate in water, light guiding device to improve the light climate in the eutrophic water body, and growing submerged plants for removing nutrients in water, especially phosphorus.
The material used in this study is calcium peroxide nanoparticle (CPNP), and the particle size is as small as 37.0 ± 4.5 nm. In Microcystis aeruginosa growth inhibition test, dosage more than 10 ppm yielded good effects. The results showed that at 100 ppm and 500 ppn doses, the removal is 87.7 % and 93.0 % respectively. However, the efficacy of turbidity removal of CPNP is not significant. A toxin decomposition test showed that CPNP can remove microcystin-RR and microcystin-LR at as low as a 10 ppm dosage, and the effect on removing microcystin-LR is better than that on microcystin-RR. In phosphorus removal test, the calcium ion from CPNP dissociation precipitated with phosphorus in aqueous solution. The results showed that dosages of 100 ppm and 500 ppm have excellent removal efficiency. In the other hand, in the light climate improvement experiments, Taiwanese isoetes was chosen as submerged plant to conduct experiments with optical fiber assembled equipment. The results showed that adding 100 ppm CPNP and directing light to bottom water is effective to stimulate the growth of Taiwanese isoetes.
| Identifer | oai:union.ndltd.org:TW/102NCHU5087033 |
| Date | January 2014 |
| Creators | Fang-Ko Hsiao, 蕭方歌 |
| Contributors | Shu-Chi Chang, 張書奇 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 160 |
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