In many small rest centers, bungalows, including those located at the seaside, there are various facilities which during the holiday season generate highly concentrated sewage. An example may be car washes at gas stations, small sandwich bars, and camping sites. One of the possibilities of solving the problem of treating sewage generated in such places are small treatment plants which can operate periodically and are characterized by low running costs. This possibility is offered by a photocatalytic oxidation in the presence of titanium dioxide as a preliminary treatment process and the next biological treatment in a so-called household sewage treatment plant. In particular, it is suitable for strongly insulated areas. The stage of chemical oxidation was a subject of our research and was performed using model solutions of surfactants and commercially available car shampoos. Promising results of their degradation were obtained.