Europe’s water strategy: what industrial water reuse needs in practice

A European initiative with a practical focus

On 21 September 2026, the European Commission, the European Economic and Social Committee and the European Committee of the Regions jointly launched the Water Resilience Stakeholder Platform. The platform aims to identify barriers to implementation and support practical solutions. Its topics include digitalisation, water efficiency and water reuse.

For industry, this is a signal to give water greater consideration in production planning, operating costs and site development. The launch of the platform does not, however, introduce a new blanket obligation to reuse industrial water.

Understand water demand first

A water balance comes before plant selection. How much freshwater is used? Which wastewater streams arise, what do they contain and how much do their volumes and composition vary? Potential users of treated water, their quality requirements and the timing of water availability and demand are equally important. Storage must be considered where supply and demand do not coincide.

Cooling-water make-up, cleaning and demanding production processes do not automatically require the same water quality. Fit-for-purpose treatment follows the actual application and avoids unnecessary technical and operational effort.

The treatment train follows the water quality

Depending on wastewater composition and the required target quality, biological treatment, membrane filtration, reverse osmosis and further polishing steps can be combined as appropriate. Not every water stream needs every stage.

A membrane bioreactor, or MBR, combines the biological degradation of suitable organic constituents with the separation of biomass and suspended solids. It does not reliably remove dissolved salts. If salinity or other dissolved substances need to be reduced, a downstream reverse osmosis stage may be required.

Stable operation requires pretreatment, fouling and scaling risks, cleaning and hygiene requirements to be considered together. The treatment train must match the actual water composition and the intended use.

Reuse does not end at the permeate outlet

Water reuse requires all material streams to be considered. Substances retained by membranes remain in the concentrate. A technically suitable and legally compliant route for further treatment or disposal is therefore essential.

Energy demand, chemical consumption, membrane service life, maintenance and plant availability also belong in the assessment. High water recovery alone does not demonstrate economic viability. What matters is the overall system under actual operating conditions.

Implement in stages and verify in operation

A modular design allows water reuse to be expanded step by step. A suitable sidestream or pilot trial can establish the water quality, recovery and costs achievable under real conditions before larger investments are made.

Operation requires appropriate monitoring. This includes flow rates, pressures, conductivity and the quality parameters relevant to the intended use. Monitoring helps verify that requirements are met even when feed quality fluctuates.

From European strategy to on-site implementation

The new platform can support the exchange of knowledge on water efficiency and reuse. Implementation nevertheless remains site-specific. It starts with the available water streams and target qualities and leads to a reliable treatment train.

ROTREAT supports industrial applications with modular wastewater treatment and membrane systems. The objective is not maximum treatment, but the right treatment for the water composition, intended use and operating conditions.

Would you like to assess which water streams at your site are suitable for reuse? Talk to us about your requirements.