How to fix manhole corrosion
Microbiologically Induced Corrosion (MIC) corrodes sewer and sanitary manholes. The corrosion on the concrete occurs when hydrogen sulfide gas (H2S) is converted into sulfuric acid (H2SO4) by Thiobacillus bacteria that grow on the concrete surfaces above wastewater flows.
This video shows the relining and restoration of a corroded manhole using AP/M Permaform’s centrifugally cast Permacast product.
AP/M Permaform relining demonstration in Langley, British Columbia in August 2011:
The end of the video shows a green/blue color in the new concrete manhole lining. This color indicates that the Permacast liner contains ConShield, the anti-bacterial protection agent proven to prevent the growth of the anaerobic Thiobacillus bacteria that creates sulfuric acid and causes MIC corrosion.