Mathematical Modelling for the Concrete Corrosion of Sewer Systems
Concrete corrosion in sewer systems is a complicated and dynamic process that involves wastewater, head gas, and concrete surfaces. The key process is the biological sulfide oxidation by corrosion microbial communities in the corrosion layer. Mathematical models are practically useful in designing new concrete sewer systems meeting the service life, or in planning the sewer rehabilitation and chemical dosing by estimating the corrosion rates. Theoretically, various corrosion models can also be employed to optimize the design of corrosion-resistant concrete or sewer operation. This chapter provides a review of models for the sulfide oxidation kinetics and different types of models for the service life, including corrosion initiation time and corrosion rate. As corrosion rate is the determining factor for concrete sewer service life, various models were discussed for its estimation, including empirical models, data-driven models, and process dynamic models. These mathematical modelling tools would enable better design, construction, operation, and management of sewer systems.
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