Characteristics of Microflora on Corroded Concrete Sewer Pipe
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概要
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The microflora on the corroded concrete sewer pipe at the water level where the most severe corrosion had occurred, was investigated using a specific identification method for species of acidophilic thiobacilli. This method was very convenient for handling many isolates within a short time, though chemotaxonomical analysis must follow in order to identify them specifically. When the corroded sample was examined using several solid media, bacterial colonies were found only on acid solid media (pH 2.5) ; fungi were detected on neutral solid media (pH 6.5) as well as on acid media (pH 2.5) . The acidophilic bacterial colonies were identified as<I>Thiobacillus thiooxidans</I>according to the identification method. Fungi appearing on each medium had morphological similarity. These results indicate that the most severely corroded sewer pipe at the water level was inhabited by only two kinds of microorganisms, <I>T. thiooxidans</I> and an acid-resistant fungus. The simplification of the microflora may be caused by low pH and a single energy source of sulfide. Two strains, <I>T. thiooxidans</I> OMSO 24 and <I>T. thiooxidans</I> OMSO 44, isolated from the corroded sewer pipe, were found to oxidize sulfur compounds, such as H<SUB>2</SUB>S and elemental sulfur, to sulfate. This fact proved that they participated in the acceleration of corrosion of the concrete sewer pipe.
- 日本水処理生物学会の論文
日本水処理生物学会 | 論文
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