NA-06 - Cleaning: Flushing Methods

- Back to outline
- Back to Modules

Overview of the cleaning methods
Criteria for the selection of the cleaning process...
Flushing methods
Surge flushing
Back-up flushing
End of module

Flushing method recommendations

Operational concept – Step 2

In step 2, the appropriate surge flushing devices are determined considering their specific fields of application, and the requirements that are defined by the limiting conditions (step1).

The following table includes recommendations regarding the selection of surge flushing methods depending on the operating resources/function, fields of application and type of cleaning. They are categorized into man-accessible and non-accessible sewers (< DN 800).

/ 103

Recent studies [Dohma2002a] [Dettm2004a] [Dettm2005a] [Pinne2005] [Dettm2005a] show that surge flushing devices are not only appropriate for preventive cleaning measures of sewers, stormwater tanks and stormwater sewers at regular intervals, but also for their thorough cleaning.

According to [Dettm2005a], the deposits that have built up over a period of months or years can be removed in the process of thorough cleaning of sewers. In most cases, a considerable build-up of deposit amounts in-situ and solidifications to a certain degree are to be expected. Generally, thorough cleaning is an isolated process that is carried out just once, immediately before an ongoing preventive cleaning approach is instituted. The application of other cleaning methods might also be required.

Preventive cleaning (also called maintenance cleaning) of sewers using surge flushing is defined as the removal of deposits at regular intervals. It allows for a prompt removal of deposits, or rather the provision of permanently deposit-free sewers. Generally, the substances that have to be mobilised here are unconsolidated.

Dohma2002a

Dohmann, M., Dettmar, J.: Untersuchungen zur optimierten Kanalreinigung im Hinblick auf eine Minimierung biogener Schwefelsäurekorrosion und eine Verhinderung von Schmutzfrachtstößen bei der Abwasserbehandlung und Mischwasserentlastung, Abschlussbericht zum Forschungsvorhaben des MUNLV NRW, Institut für Siedlungswasserwirtschaft der RWTH Aachen (2002).

Dettm2004a

Dettmar, J.: Betriebliche und wirtschaftliche Aspekte beim Einsatz von Schwallspülungseinrichtungen in Abwasserkanälen. Tagung „Entwicklungen in der Kanalisationstechnik“, Köln (2004).

Dettm2005a

Dettmar, J.: „Beitrag zur Verbesserung der Reinigung von Abwasserkanälen“, Dissertation, Institut für Siedlungswasserwirtschaft der RWTH Aachen (2005).

Pinne2005

Pinnekamp, J., Dettmar, J.: Untersuchungen eines neu entwickelten Reinigungssystems für den Einsatz in Stauraumkanälen, Abschlussbericht zum Forschungsvor-haben des Institutes für Siedlungswasserwirtschaft der RWTH Aachen (2005).