Non-conventional technologies are commonly used in the Czech Republic for wastewater treatment, especially for small municipalities (up to 500 PE). Three main types of non-conventional technologies are applied: stabilization ponds, soil filters and constructed wetlands. Within the research project of Czech Ministry of the Environment, authors have observed 14 localities for two or more years. In this article all three types of non-conventional technologies will be described. At the same time detailed results of the monitoring will be presented with the accent to treatment efficiency comparison of these technologies in parameters COD, BOD5, SS, NTOT and PTOT. Operational experiences of non-conventional technologies will also be described, especially critical moments which can negatively influence the treatment efficiency.

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