Biological Wastewater Treatment with TFR Technology

TFR industrial for for industrial wastewater treatment
TFR industrial for for industrial wastewater treatment

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.

Biological Wastewater Treatment with the TFR Bioreactor
Biological Wastewater Treatment with the TFR Bioreactor
Carrier Material with Microorganisms
Carrier Material with Microorganisms

Wastewater Technology with Lightweight Carrier Material

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.

Biological Wastewater Treatment with DAS Environmental Expert
Biological Wastewater Treatment – Great Performance with Low Energy Consumption

Biological Wastewater Treatment – Great Performance with Low Energy Consumption

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

Fields of Application

  • 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

Selected Application Examples for using TFR Technology

TaskWastewater CharacteristicsGoal
Indirect Discharge
Pre-treatment before discharge into sewage system

Industrial wastewater, easily to not easily biodegradable

< 600 mg/l COD
< 400 mg/l BOD5

Direct Discharge
Treatment before direct discharge into surface waters

Industrial and municipal wastewater, easily to not easily biodegradable

< 100 mg/l COD
< 25 mg/l BOD5

Water re-use
Irrigation (in arid areas, for instance)

Usage Water

Low concentration and municipal wastewater

Industrial wastewater

< 20 mg/l COD
< 10 mg/l BOD5

Nitrogen removal
Industrial wastewater heavily loaded with ammonium

< 2 mg/l NH4-N

Product Line for Biological Wastewater Treatment

TFR industrialTFR municipalTFR mobileTFR pilot
Characteristics/ Application
  • Our bestseller of the TFR family
  • Modular configuration in different sizes
  • Multi- configurable and flexibly expandable
  • Specifically designed for smaller municipal wastewater loads
  • Application in communities, hotels, clinics, high-rise buildings
  • Optimally tailored to small sedimentation and storage tanks
  • Flexible solutions for temporary applications
  • Completely pre-mounted and tested ex works
  • Mounted in standard container 20 or 40 inches (ISO 668)
  • On-site pilot-plant at customer location
  • For data assessment, demonstration or performance proof
  • Ready-to-use, pre-mounted on two euro-pallets
Reactor measurements (Ø x H)
  • Standard size: 3 x 8 m;
    2.5 x 6 m;
    2 x 6 m
  • Special sizes per request
  • As a single reactor from 1.4 x 3.5 m up to 3.0 x 8 m
  • In modular configuration 1.2 x 2.25m
  • 2.25 x 6 m (20”) up to 2.25 x 12 m (40”)
  • 0.6 x 2.8 m (Height for transport = 2.0 m)
Influent per reactor
  • 10 – 1,300 m³/d (depending on wastewater parameters)
  • 10 – 400 m³/d
  • 5 – 800 m³/d
  • 5 – 300 l/h
Organic load per reactor
  • 1.2 – 8 kg COD/m³/d
  • 50 – 2,000 PE
  • 1.2 – 8 kg/m³/d
  • Customer specific
Space requirements per reactor
  • ca. 4 x 4 m
  • ca. 4 x 4 m
  • 2.44 x 2.90 m
  • 2 x (0.8 x 1.2) m
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