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This paper deals with the problems of corrosion caused by sulfuric acid generated within sewer systems. The problems are identified and potential economical solutions are presented. There are four major ways to mitigate the corrosion of concrete pipe and manholes, due to sulfuric acid produced in a sewer system: • Utilize Az design to elevate the alkalinity of the concrete. • Coat or line the pipe and structure. • Reduce the microbial induced corrosion (MIC), using computer model designs. • Use acid-resistant cements and antibacterial additives.
The last two methods will be discussed at length because they are the most cost-effective means of extending the life of concrete in a sewer system. By reducing the generation of hydrogen sulfide and at the same time reducing the microbial activity in the system, MIC is effectively reduced. Also, by incorporating acid resistant cements and antibacterial additives, concrete in sewer systems will experience less or no corrosion; thus the life of the sewer system is extended.
Microbial induced corrosion, Thiobacillus bacteria, hydrogen sulfide, antimicrobial, concrete pipe
Director, Synthetic Industries, Inc., Chattanooga, TN
President, AP/M Permaform, Johnston, IA
Vice President, Technical Services, Environmental Consortium, Conyers, GA