Means of preventing deterioration of structures handling sewage or exposed to the fumes from sewage are discussed. Relative merits and application techniques of chemical additives are considered. Recommendations concerning control through design to increase velocity or eliminate vapor space are weighed. Application of and results achieved through ventilation of sewers are reported in some detail, including service results on installations over periods up to 16 years.
Control through use of materials resistant to the corrosives in sewage is outlined. Special cements, clay and plastic liners, special jointing materials and protective coatings for metallic and non-metallic materials at treatment plants are mentioned. Cathodic protection as an effective control measure is considered and recommended where feasible.
