scope:

This European Standard specifies requirements, test methods, evaluation of conformity and marking for prefabricated secondary treatment units used for the treatment of effluent from septic tanks according to EN 12566-1 or EN 12566-4 in small wastewater treatment systems for up to 50 PT. It applies to the prefabricated secondary treatment unit, where all its components are factory or siteassembled and placed on the market as a kit by one manufacturer. These prefabricated secondary treatment units are watertight without any direct infiltration into the ground. The prefabricated secondary treatment unit consists of one or more tanks made of concrete, steel, unplasticized polyvinylchloride (PVC-U), polyethylene (PE), glass reinforced polyester (GRP-UP) or polypropylene (PP). Other components specified by the manufacturer, such as pipes, pumps and filter material may be used in the unit. This standard establishes the performance of the prefabricated secondary treatment units needed to verify their suitability for the end use conditions for which the test methods are specified. This standard applies for the secondary treatment units for use on the top of the ground (outside the building) or buried in the ground where no vehicle loads are applied to the unit. Retrofit kits (see definition in 3.7) are not covered by this standard.