07514 Monitoring Microbially Induced Concrete Corrosion in Pipelines

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Product Number: 51300-07514-SG

ISBN: 07514 2007 CP

Author: Ma Guadalupe Gutierrez-Padilla, Angela Bielefeldt, Mark Hernandez, and Joann Silverstein

Publication Date: 2007

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Rapid deterioration of concrete sewer pipes due to microbial activities has a major impact on environmental health and safety, particularly in countries with warm climates, such as the USA and Mexico. This is a process termed “Microbial Induced Concrete Corrosion” (MICC). An experimental system was set-up to demonstrate the mechanism of MICC by measuring pH, sulfate formation, and loss of material in an accelerated setting and to later investigate conditions that are similar to those commonly found in sewer collection systems. In a system with the continuous water circulation and sulfur oxidizing microorganisms (SOM) + Acidiphilium cryptum inoculation, significant pH drop (10 to 3), mass loss of 0.39%, sulfate formation, and calcium release were observed within 100 days. A continuous hydrogen sulfide concentration in the system keeps the MICC process going. It seems the corrosion is initiated by neutrophilic sulfur oxidizing microorganisms (NSOM). Based on these results, the mechanisms for the MICC can be explained by hypothesizing that the growth of NSOM provides favorable conditions for the subsequent acidophilic sulfur oxidizing microorganisms (ASOM) growth in a new concrete sewer pipe.