Mechanism of Biological Corrosion of Sewer Pipe and Its Control

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Objectives of this research are, (l)to clarify the mechanism of microbial corrosion and(2)to develop the countermeasures in order to control the corrosion. Especially the focus was placed on the investigation from the aspect of microbiology.In 1990, it was clarified that there was the close relationship between H_2S production and some environmental factors such as organic matter(organic acids etc.), sulfate concentration, and the number of sulfate reducing bacteria. The H_2S was produced mostly from sediments in sewer pipes.In 1991, the effect of environmental factors on the corrosion rate were investigated. It was revealed that H_2S concentration, moisture contents and temperature are the important factors. The corrosion was serious at the portion around the water lebel. The corrosion rate of the portion ranged from 4 to 8 mm/year. The corroded materials produced depended on pH values.