Biogenic corrosion of cementitious composite in wastewater sewerage system-A review

Biogenic corrosion of concrete in wastewater systems is a severe and widespread global problem, costing billions of dollars in annual maintenance and rehabilitation. Corrosion of cementitious matrix due to the in-situ formation of sulfuric acid (H2SO4) by the colonization of sulfur-oxidizing bacterial species on concrete surfaces is considered the primary cause of structural degradation. In its advanced stage, corrosion may even lead to structural failure within 10-20 years and jeopardize its durability. Despite the significant efforts made by researchers worldwide toward different repair approaches, the problem of biogenic corrosion of cementitious composites remains unresolved and a challenge for industries and stakeholders. Currently, cement composites are not able to carry out prolonged acidic attacks in sewerage systems (pH < 3), which stimulates the urgent need for improved research. The purpose of this research article is to provide an in-depth analysis of how the biogenic sulfuric acid (BSA) attack initiated and propagated concrete deterioration at various levels of the processes involved. Additionally, the article presented some of the previous case studies and preservation measures adopted to reduce concrete corrosion in wastewater sewerage systems.

Automated summary

Biogenic corrosion of concrete in wastewater systems is a global problem that causes extensive damage and costly maintenance. It is primarily caused by the colonization of sulfur-oxidizing bacteria on concrete surfaces, leading to the formation of sulfuric acid. Despite research efforts, a solution to this problem remains elusive.