DAS Environmental Expert GmbH

Biological Wastewater Treatment System for Industry and Municipalities



Many different industries have various requirements for wastewater treatment, but all have one thing in common: The need for an optimised solution for wastewater treatment. Whether we install a single treatment step, a complete wastewater treatment plant or equip an entire factory with systems for wastewater treatment – DAS Environmental Expert solutions are always tailor-made.


Regardless of whether you need to limit discharge values to reduce sewage charges or you need to increase process efficiency by recycling usage water, our specifically developed process for biological wastewater treatment was designed to fulfill all individual needs.

Customers of DAS Environmental Expert have been successfully using our technology for wastewater treatment in the chemical and pharmaceutical industries; the semiconductor manufacturing sector and energy industry; the cleaning and textile industries; the brewery and beverage industries; the meat and fish processing industries, and also in agriculture and municipal wastewater treatment as well as in rendering services. In all of these areas, DAS technology cleans and recycles accrued wastewaters in a safe, environmentally friendly and efficient way.


TFR stands for Trickle-Flow-Reactor, also called the trickle-flow principle. The system uses a very light, small-grain carrier material that, within days, is covered by a highly active mixed population of bacteria that is adapted to their respective conditions. Unlike commonly implemented wastewater systems, the carrier material bed is not located within a closed body of water and thus can be easily supplied with sufficient amounts of oxygen. The constant inflow of wastewater that trickles down over the bed is aerated by ambient air that is supplied by a ventilator at a minimum pressure flowing in the opposite direction.


The carrier material is biologically, chemically and mechanically stable. An automatic     operating rinse technology regularly flushes re-growing biomass from the system. The high density of microorganisms as well as the optimum conditions for the transition between biomass, water contaminants and excess oxygen are the basis for the system’s high performance and stable bio-degradation values.
No Activated Sludge Process or Trickling Filter System

In the early 1990s Germany tightened its policies for the wastewater sector. Just degrading carbon was no longer sufficient. Eliminating nitrogen and partially phosphorous were the new challenges for the classic trickling filter systems that was commonly used at the time. The new requirements, however, overexerted the old systems, which is why the wastewater sector transitioned into using the complex activated sludge process. Sludge pumps, inlet and outlet sludge handling and SPS-regulated aeration phases to control nitrification and de-nitrification replaced the trickling filter system.

But the new complexity created new problems. Bulking sludge caused a decrease in biomass or floating sludge leading to undesired sludge overflow negatively effecting discharge values. This was a major challenge. The new process for wastewater treatment also increased the energy demands of wastewater treatment plants, due to the more elaborate oxygen supply and oversized process systems.


The more complicated the technology becomes the higher its susceptibility to faults which leads to increased maintenance and operating costs. We say: “Why not just forgo the extras, and focus on what is truly necessary to make operation reliable?” We call it ‘tailor-made wastewater treatment’ and our TFR Technology is based on this principle.

As we forgo the heavy water column, we eliminate the need for the immense wall thickness and inefficient, energy-intensive aeration of the classic systems. To achieve this we employ a light carrier material, which, due to its form and size, not only offers a large population surface for bacteria with high sludge age, but also provides an ideal balance between volume and surface.

  • High biological adaptation
  • Effective and energy-saving aeration
  • Small footprint
  • Easy construction and installation even on intermediate ceilings
  • High flexibility at fluctuating wastewater loads
  • Fast installation
  • Low maintenance
  • Fully automated process control
  • Compatible with all classic processes

  • Reduction of organic loads (COD/BOD value degradation)
  • Nitrification (ammonium degradation)
  • De-nitrification (nitrate degradation)
  • Decentralised treatment of wastewater streams
  • Complete treatment for direct and indirect discharge
  • Water recycling and multiple use
  • Plant engineering, system extensions and renovations

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