1. Comparability analysis

Daniela Schmitz, M.Sc.

Testing Engineer

  +49 241 75082-19

  +49 241 75082-29

 

If all relevant tests according to EN 12566-3 have been successfully performed, a comparability analysis can be conducted so as to extend the series by a new plant.

PIA offers comparability analysis based on range definitions according to EN 12566-3. We examine whether your new plant meets the requirements of comparability and, therefore, comparable treatment results can be achieved.

2. Holiday home tests / Underload tests

If you would like to sell small wastewater treatment plants in Germany and Scandinavia, an additional holiday home test or an underload test can be useful. Often small wastewater treatment plants are installed in such holiday homes, which can lead to long underload periods. Nevertheless, proper cleaning performance must still be guaranteed. In a test of ten to twelve weeks, different phases are tested with underloads, thereby determining the treatment performance.

An underload test can, for example, be set up as follows:

3. Testing of submersible pumps for small wastewater treatment plants

If all relevant tests according to EN 12566-3 have been successfully performed, a comparability analysis can be conducted so as to extend the series by a new plant.

PIA offers comparability analysis based on range definitions according to EN 12566-3. We examine whether your new plant meets the requirements of comparability and, therefore, comparable treatment results can be achieved.

4. Range tests in France

Daniela Schmitz, M.Sc.

Testing Engineer

  +49 241 75082-19

  +49 241 75082-29

 

In its minutes* of 31 May 2011, the French Environmental Ministry establishes requirements on how to determine the comparability of models in a range. These are applicable for plants up to 20 PE. The comparability is determined by practical tests on the different models in the range.

The test of comparability includes the following partial tests:

• 1. Test of the measurement of the oxygen transfer in clean water in aeration tanks according to EN 12255-15. For all new models the oxygen transfer rate must at least match the rate of the initial model.
  
  
  Measurement of oxygen transfer rate after adding sodium sulphite
  
  
• 2. Test of the residence time with a tracer test. Residence time of all new models must match the time of the initial model.
  
  
  Beispielhafter Verlauf der Konzentrationsabnahme in einem geprüften Modell
  
  
• 3. Measurement of recirculation
  
  
  Exemplary measurement of sludge recirculation
  
  

A minimum of two tests, respectively 2 models is necessary. The model initially tested according to EN 12566-3 Annex B delivers the reference level. Subsequently, all new models of the range have to be tested. Each model of the range has do undergo all three partial tests.

According to the requirements of the French Protocoles d’essais accompagnent, the models must deliver comparable results.

You can find further and all relevant information here:

http://www.assainissement-non-collectif.developpement-durable.gouv.fr/procedure-d-evaluation-des-dispositifs-de-a625.html

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* Protocole general pour la reconnaissance de gamme dans le cadre de la procedure d'agrement ministeriel des dispositifs d'epuration ayant une capacite inferieure ou egale a 20 EH

5. Testing of sludge development

For some countries or plants, it may be useful for the plant to undergo a test of sludge development. Here, the point of time when the system must be desludged is recorded as well as how much sludge was produced in this period.