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題名 | 微生物對核廢料工程障壁退化之影響=Microbial Effects on the Degradation of Engineered Barrier for Radwaste |
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作 者 | 周鳳英; 鍾仁傑; 林善文; 李境和; 邱賜聰; | 書刊名 | 核子科學 |
卷期 | 36:1 1999.02[民88.02] |
頁次 | 頁51-57 |
分類號 | 449.8 |
關鍵詞 | 微生物; 工程障壁; 退化; Microbe; Engineered barrier; Degradation; |
語文 | 中文(Chinese) |
中文摘要 | 本研究探討本省特殊環境下,微生物對水泥固化體之影響。研究中進行水泥固化 體及鄰近環境之微生物採樣、分離、鑑定微生物之種類,及在低輻射劑量下,微生物於水泥 固化體上之生長能力,並觀察菌株生長對水泥固化體結構之影響。結果顯示分離菌株包括 Thiobacillus sp.、Siderocapsa sp.、Pseudomonas sp.及Fusarium sp.等,受測菌株皆 可於水泥固化體表面生長,Thiobacillus sp.菌體生長造成水泥固化體結構受到劇烈侵 蝕;Pseudomonas sp.於水泥固化體生成密集具綠色螢光菌落,處理16個月後,菌落形成處 水泥固化體表面有直徑約1.5mm的凹洞;Siderocapsa sp.存在下對水泥固化體之影響較小。 受不同菌體侵蝕後,水泥固化體呈現不同表面結構的變化,真菌菌株除於水泥固化體表面生 長菌絲、菌核外,亦與細菌菌株交互生長成生物膜。在劑量率為100 rad/hr之鈷六十照射 場中,微生物對水泥固化體之影響與未接受輻射劑量者具相同效果。於本省高溫多濕之環境 下,受測菌株皆可於水泥固化體表面生長,微生物對工程障壁之影響是核廢料處置上應注意 之因子。 |
英文摘要 | This study explores the microbial effects on the degradation of concrete-based engineered barriers for radwaste. Experimental procedures consisted of (a) sampling and isolating of the microbes from the concrete, (b) quantifying the growth potential of microbes on the concrete under a low dose-rate of irradiation, and (c) observing the superficial variation of concrete's structure. Isolated species, including Thiobacillus sp., Siderocapsa sp., Pseudomonas sp. and Fusarium sp., were used for testing. According to our results, all of the tested microbes could grow and form colonies on the concrete. The degradation effect on concrete depended on the microbe species. The T. thiooxidans created obvious degradation of concrete. The degradation of concrete created by T thiooxidans exceeded that of Pseudomonas sp. and Siderocapsa sp. Pits up to 1.5 mm diameter in size were produced in the superficial structure of Pseudomonas sp. treated concrete. Notably, large mycelium and sclerotium of fungi formed on the superficial of the concrete. Moreover, bioflim was developed herein. The same microbial effects were obtained under a dose-rate (100 rad/hr) of gamma irradiation. In sum, investigating the degradation of concrete by microbes reveals that the microbially mediated concrete degradation should be of priority concern in radioactive waste disposal. |
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