Odorous Problem Associated with Nostoc sp. in water Supply System of Central Taiwan

• Main Authors: Jeang, Been Jy, 蔣本芝
• Other Authors: Hu, Tai Lee
• Format: Others
• Language: zh-TW
• Published: 1993
• Online Access: http://ndltd.ncl.edu.tw/handle/26809265357289742373

碩士 === 逢甲大學 === 土木及水利工程研究所 === 81 === Reproductive brown granules were found attached on the walls of the storage in the Fong-Yuan Water Purifi-cation Plant. A filamentous cyanobacterium was pre-dominated after culture. The filamentous cyanobacterium contributed a very distinct and offensive noisome odor. The objective of this study was to investigate the odor-causing cyanobacterium. The study included identifi-cation of cyanobacterium and analysis of odor-causing organic compounds by closed-loop stripping analysis (CLSA) using makeshift apparatus. Finally, this study investigated the influence of two environmental factors- -temperature and light intensity-on odorous compounds production by cyanobacterium cells. After a series of isolation, purification, got a single cyanobacterium, however, an actinomycetes stillexisted in the culture. Evidently, this actinomycetesfailed to produce the characteristic noisome odor.Therefore, it was the cyanobacterium that produced odorin culture. The cyanobactirium was Nostoc sp. onmorphological and physiological characteristics. With CLSA, trace organics could be detected at low nanogram-per-liter levels , detection limit of geosmin and MIBwere 2.6 ng/l and 95 ng/l, respectively. Nostoc sp. wasabundant at high temperature orunder light intensity ofover 2,000 lux. In batch culture, intracellular geosminand MIB were produced and released during decay phase. Nostoc sp. produced more odorous compound content(geosminand MIB) in terms of dry cell weight underunsuitable growthcondit ions. This phenomenon agreedwith results of previous studieson Anabaena sp. andOscillatoria sp., which produce geosmin.