Since March 2021, PIA GmbH has been a designated testing body by Deutsches Institut für Bautechnik (DIBt) for the testing of systems in accordance with the approval principles for storm water treatment systems Part 1: Systems for the decentralized treatment of wastewater from motor vehicle traffic areas for subsequent infiltration into soil and groundwater.
The testing of the plants includes the retention of fine particles with Millisil W4, the retention of mineral oil hydrocarbons and the retention of the heavy metals zinc and copper. The latter test is carried out on a scaled-down filter element. In order to obtain building authority approval for the system, a particle retention of at least 92 % and a hydrocarbon retention of at least 80 % must be demonstrated. Within the scope of the heavy metal test, the effluent values of ≤ 1,875 µg/l for zinc and ≤ 144 µg/l for copper must be complied with. In addition, heavy metals may only be redissolved by de-icing salt within specified limits.
To date, ten storm water treatment plants of various designs have been tested in the test hall built by PIA GmbH for this purpose. The existing infrastructure allows the testing of plants with a connection size of up to 8,000 m². Underground storage tanks guarantee a receiving water volume of 80 m³. The discharge water is cleaned on site via buffer tanks and a light liquid separator before it is discharged into the sewer.
At the international level, test requirements vary with regard to the rainfall donors used, the pollutant load and the composition of the test media. The use of alternative test media helps to understand the effectiveness of the system under real-world conditions. For example, rubber dust can be used to represent tire abrasion and microplastics. In addition, different requirements for feeding the plant require individual solutions, which are implemented in a practical manner at the test institute.
Lecture on the current topic:
Decentralized storm water treatment in times of climate change and microplastics
Urban flash floods, the progressive sealing of soils and anthropogenic pollution such as microplastics urgently require alternative solutions in the field of precipitation water treatment. Local treatment and infiltration help to relieve hydraulically loaded combined sewer systems and to take targeted action at the point of pollution. Decentralised rainwater treatment plants can offer an alternative. In Germany, but also in other countries, requirements are therefore already being placed on these systems and tested under laboratory conditions. The lecture shows the current problems, gives an overview of the different treatment systems and their possible applications, and presents the test requirements and the tests.
Speaker: Daniel Verschitz, Time: 24.02.2021 at 10:00 a.m., Language: English
Duration: Max. approx. 30 minutes each + 10 minutes questions / discussion / feedback
If you are interested, you can register here:
Clenviro Ltd. + Harlequin Manufacturing Ltd. - MATRIX CLF + CAP
KLARO + PPR Carlow - KLARO one (distributed by Wastewater Solutions)
On November 19th, 2020 PIA's accreditation was successfully converted to “DIN EN ISO/IEC 17025:2018-03 General requirements for the competence of testing and calibration laboratories (ISO/IEC 17025:2017)”
The scope of the accreditation, as well as a list of testing methods can be found in the "Directory of accredited bodies" at DAkkS.de.
DAkkS is a full member of the International Laboratory Accreditation Cooperation (ILAC) to ensure mutual recognition under the ILAC MRA.