As I mentioned last month, a long-running debate in the industry has centered on advanced corrosion in concrete sewage tanks. The culprit causing this corrosion has long been identified as hydrogen sulfide gas (H2S). The gas is generated by the decay of organic matter in anaerobic septic system sewage tanks. In addition, small quantities of the gas can be generated from organic material in piping to and from the tanks.
The National Precast Concrete Association has been looking at this issue for several years and continues to fund and conduct research to solve the problem. Corrosion in tanks occurs due to
