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How to deal more sustainably with depleting resources? How to avoid overexploitation? FiW is developing feasible solutions to these questions jointly with national and international partners. Energy efficiency at wastewater treatment plants, the recovery of irrigation water, energy and nutrients from wastewater and residual materials, and the reduction of water losses, especially in an international context, are focal points of our work.

Although wastewater treatment plants account for less than 1% of national energy consumption, they are among the main consumers of electrical energy in municipalities. The energy demand of wastewater treatment plants depends on many factors, such as wastewater volume and pollutant load, process technology, type of sludge treatment and specific site conditions. In relation to the average load of wastewater treatment plants, specific consumption values of electrical energy result between about 20 and 60 kWh/(PE·a) for an entire plant or between 12 and 30 kWh/(PE·a) for the biological treatment.

Based on numerous energy analyses, the participation in the guideline DWA A 216 and the NRW Energy Manual, FiW has the relevant expertise for the energy optimization of municipal and industrial wastewater treatment plants. For the successful energy optimization, a systematic analysis of the design and the current operating conditions as well as a comprehensive energy analysis are required. As a result, recommendations for energy savings with performance estimates as well as performance and cost comparison calculations are provided. On this basis, the implementation of measures can be prioritized.

Adapted solutions for the (partial) desalination of various waters and the further development of innovative treatment technologies in the wastewater sector are among our core competencies. With our projects, we contribute to the sustainable use of global resources and pursue the guiding principle of a circular economy. The overlapping of the globally increasing water demand of population, industry and agriculture as well as a partly significantly reduced water supply due to climatic influences represents a widespread field of tension, which also increasingly leads to political and social conflicts. At FiW, we develop solutions for the specialized topic of resource efficiency that are appropriate to the local technical and sociocultural context.


awaregio | Waterreuse

awaregio | Waterreuse

Modular wastewater treatment processes for the reuse in agriculture, aquaponics and the substitution of drinking water resources


Methanol synthesis from sewage gas

GREEN-BEE - Market- and product-oriented further development of the concept for synthesizing methanol from sewage gas

GreenFactory SARTEX | Tunisia

Sustainable denim finishing using water recycling and renewable energies

GreenFactory SARTEX in Tunisia

Sewage sludge management | Tunisia

Water management in Tunisia after the Arab Spring

Sewage sludge management in Tunisia


Anoxic Biowash for Biogas Desulfurization as a Contribution to the Climate Future

NitroSX – Microbiological Biogas Desulphurisation

Trace substance elimination

Trace substance elimination from CP plants

Best Available Techniques (BAT) for reducing the entry of micropollutants from wastewater of CP Treatment Plants for hazardous waste into water bodies

WaterReTunE | Tunisia


Water Reuse in Tunisia