CE Marking of small Wastewater Treatment Systems in Europe
Within the development of a harmonised single European market the previous national regulations were dismissed and replaced by a European Standard, the EN 12566 "Small wastewater treatment systems up to 50 PT. Part 3 of this standard: "Packaged and/or site assembled domestic wastewater treatment plants" is applicable for those systems, the prefabricated components of which are factory-or site-assembled by one manufacturer and which are tested as a whole.
The following initial type tests are mandatory and have to be executed by an accredited testing institute a so called "notified body":
- Treatment efficiency testing
The test is applied to the smallest model of a range. The test follows a strict test schedule that is specified in the standard. The testing schedule can be found in Annex A1.
- Watertightness test
The watertightness of every single tank of a range of treatment systems has to be tested. There are different ways to test the watertightness. One is the "water test", the second is the "vacuum test" and the third is the "pneumatic pressure test". Which test is applicable depends on the material of the tank. A detailed tabular list of materials and the corresponding tests can be found in Annex A2.
- Crushing resistance/maximum load deformation
There are also different ways to test the structural behaviour of a tank depending on the material of the tank. There are practical tests and calculations. In contrast to the watertightness test, not every tank of a range has to be tested, only the biggest one assuming that this one has the worst structural behaviour. Again a detailed tabular list of materials and the corresponding tests can be found in Annex A3.
The durability test is not necessary when the manufacturer uses materials of which the properties are already known (e.g. from the supplier), which is mostly the case.
Next to those initial type tests which have to be executed by an external institute, the manufacturer himself is obliged to guarantee the invariant quality of this products by implementing a factory production control in his production process.