Plug Flow Technology

In 1994, RUDOLF MESSNER UMWELTTECHNIK realised in the context of updating an existing aeration system, where efficient aeration along with improved process stability were required, an intermittent denitrification without agitators or recirculation for the first time. The resulting achievements regarding the degradation efficiency and economy were so convincing that this procedure has established itself market-wide under the name RMU Plug Flow Technology in combination with a specially adapted control and regulation technology.

 

Characteristics of the Procedure

A characteristic feature of this method is the fact that the mixing equipment in the aeration tank to maintain adequate mixing and near bed velocity, as described in the ATV rules, are not required. 

 

The aeration elements are arranged in the entire aeration tank (tubular reactor) over a large area and as close to the ground as possible, and are used also for activated sludge homogenisation during the unaerated denitrification phase without disrupting the denitrification process by means of the so-called RMU Air Pulsing.

Klick = Large view

 


Prerequisites

The requirement for a secure nitrogen removal and improved cleaning performance is the procedural change to several cycles with an aerated phase (nitrification) and a non-aerated phase (denitrification) each, intermittently in the tubular reactor and without agitators or recirculation. The automation of the process is realised system-specific with the MESSNER control concepts using modern online sensors.


Summary

By switching to the RMU Plug Flow Technology in combination with the use of the MESSNER Aeration Panels, various projects have demonstrated that not only energy savings of more than 40% are possible, but also a stable and significantly improved cleaning performance and positive effects on the sludge properties (low foaming, improvement of the sludge index, better stabilisation, increasing dewaterability etc.)

 

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