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  • Expert statements and studies
  • Consulting and technical support for planners, manufacturers and operators
  • laboratory tests and semi-technical trials
  • Scientific monitoring of large-scale facilities
  • Organisation of conferences and symposia
  • Economic efficiency assessments, financing issues and contribution and fee models

The FiW has not only been a project developer but also a reliable partner for many clients in the municipal and industrial water and waste management sector. It’s consulting services and knowledge transfer have proven a great success. As a competent consultant the FiW is a partner for public and private operators of wastewater treatment plants, sewer networks and waste disposal facilities. We offer expertise for the optimisation of plants as well as for the development of innovative concepts. Our consulting services include the realisation of coordination tasks, studies, expert statements, profitability analyses and simulations at the national and international level. The focus is on industrial wastewater consulting, especially for the paper and textile industries, and on anaerobic treatment issues, as well as on running energy analyses.

As a non-profit, independent institute associated with the RWTH Aachen University, the FiW is also attractive for small and medium-sized industry companies because it reaches the interface between basic research and practice. With its practical work experience and the economic focus, the FiW is perfectly positioned to bring these together for their clients.

In cooperation with our clients, we develop customized recommendations for action for all aspects of water, energy and waste management and support their implementation. With the expertise of our interdisciplinary team, we analyse both technical interdependencies and economic, legal and social conditions. We carry out system analyses and use prognosis models and multi-criteria decision-making processes to develop forward-looking action concepts and ensure that they achieve their objectives with practical guidelines and monitoring concepts. Even at the planning stage, risks must be systematically recorded in order to evaluate measures for risk minimisation. In this context, risks with a relatively low probability of occurrence but possibly a high extent of damage must also be considered.

For many years, the FiW has been dealing with the assessment of fees and contributions and the financing of actions in water and waste management. The focus of the work is the creation of a well-founded decision-making basis concearning the updating of regulations for the distribution of costs, relevant to fees and contributions. The scientific support of processes for the development and optimisation of assessment rules begins with an analysis of the current situation and the identification of the need for action. For this purpose, existing data are systematically processed and evaluated. In this context, it must be examined whether water management, technical or legal requirements and framework conditions, and thus the cost and utilisation structures, have changed. We deal with questions of contribution assessment, especially in the areas of wastewater disposal and watercourse management. This includes, for example, the changeover from the fresh water scale to separated wastewater and rainwater charges, the introduction of heavy polluter surcharges or a basic and service charge. As part of the development of fee and charge models, the FiW also supports municipalities and associations in the implementation of accompanying working groups and the information of citizens and members.


Fees & contributions

Fees & contributions

The allocation of costs, based on the polluter pays principle, ensures sustainable concepts


Transfer from research into routine application

Holistic evaluation of available findings of SARS-CoV-2 wastewater monitoring for the pandemic assessment in North Rhine-Westphalia

GreenFactory SARTEX | Tunisia

Sustainable denim finishing using water recycling and renewable energies

GreenFactory SARTEX in Tunisia

Sewage sludge management | Hannover

Sewage sludge management in Hannover

Market and potential study sewage sludge for the North-East Region and the Hannover Metropolitan Region

Sewage sludge management | Rhine-Hunsrück

Sewage sludge management in the Rhine-Hunsrück district (Germany)

Future treatment and utilization of sewage sludge from the sewage treatment plants of the municipalities of the Rhine-Hunsrück district in Germany

Sewage sludge management | Tunisia

Water management in Tunisia after the Arab Spring

Sewage sludge management in Tunisia

Cologne boundary canal

Hydrodynamic calculations of the Cologne boundary channel

Combined modeling in the area of Cologne

Model for IWRM | Rhine-Main

Model for an Integrated Water Resources Management (IWRM) Rhine-Main (Germany)

Strategy development for water resources management for almost 5 million inhabitants

Guideline Heavy Rain

Guideline Heavy Rain

Property protection and structural precautions


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

NitroSX – Microbiological Biogas Desulphurisation

Maturity Model Wastewater 4.0

Maturity Model Wastewater disposal 4.0

From the maturity model to the digitalisation roadmap


RiverView® – Water status-related monitoring and management

Going to the bottom of the water

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



Assessment of the IT security level of small and medium-sized wastewater treatment plants in North Rhine-Westphalia below the KritisV

Heat networks

Modelling and optimisation of heat networks

Efficient and demand-oriented heat supply