Abstract
This paper deals with the investigation of corrosion of concrete in four wastewater treatment plants which are located at coastal and hot spring regions. Various chemical analyses and experiments, which consist of analysis of treated wastewater and sludge, and experients of the reduction progress employing raw sludge, hydrogen sulfuric acid production using sulfuroxidizing bacteria, are conducted in order to clarify the corrosion environment to concrete. Hydrated cement minerals of the concrete taken from the above mentioned plants were also examined by the chemical analysis apparatus of XRD, DTA-TG, IR and so forth. Results to be emphasized among them were that corosion environment in both the sludge storage tank and the thickner tank in four plants was too severe for concrete to resist high concentration of sulfuric acid.
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