This paper describes a project regarding degradation and corrosion problems for concrete at biological treatment plants in Sweden. An initial study shows that concrete used in such plants cannot resist attack by leachate from food waste, and therefore needs surface protection. In a second project part, requirements specification was developed trying to ensure the function of such protection products and systems, together with concrete, in different parts of a plant. The third part of the project involves laboratory testing of different types of products possibly suitable for the protection of concrete in biological treatment plants. Performance parameters studied and tested in the laboratory are chemical resistance and resistance to wear. Chemical resistance concerns acidic leachate water at temperatures up to 70°C. The laboratory study involves epoxy, polyurea, polyurethane, methyl methacrylate, vinyl ester, bituminous products and silica. Results and experience are reported, showing significant differences between types of material.