CONTROLLED TREATMENT WITH NITRATE IN SEWERS TO PREVENT CONCRETE CORROSION

Background on corrosion and H2S in sewers (treatment, factors that influence on the corrosion rate, empirical formula for estimation of sulphide corrosion rates- Pomeroy's equation). Tests conducted in two pilot rigs, one treated with nitrate and the other with septic sewage during 49 months. Methods and results : concrete corrosion rates (it can be described by a Monod type function), cost benefit analyses. Presentation of the nutriox concept