With Valoriise, Saur turns wastewater treatment plants into engines of the ecological transition for local communities

As elected representatives are increasingly expected to maintain essential networks and modernise sanitation infrastructures, manage costs and deliver visible results for residents, Valoriise provides a pragmatic response:

• A plant that evolves by relying on existing installations whenever possible, and by integrating new processes where relevant to produce local energy, reusable water and resources for the territory;
• Local production of renewable energy from on-site biomass;
• Reuse of treated water (REUT) for irrigation, industrial cooling or firefighting when regulatory conditions allow;
• Recovery of nutrients to support local agricultural or landscaping sectors.

The approach prioritises the use of what already exists, in line with the growing demand for sober, useful solutions adapted to climate disruption.

Valoriise is built around three operational pillars, which can be activated independently or together:

• Energy:
  • Sludge methanisation: production of biogas from organic matter, then purification to obtain biomethane injected into the grid or used on-site;
  • Power-to-Gas (complementary): production of green hydrogen by electrolysis from renewable electricity, then potential conversion into synthetic methane via methanation. Integrating Power-to-Gas strengthens the site’s energy flexibility and the territory’s autonomy by valorising surplus renewable electricity.
• Water: increasing the proportion of treated water that can be reused for non-potable purposes.
• Resources: recovering nutrients, organic matter or residual heat to support local sectors.

Each municipality can select the level of ambition according to its needs and investment capacity. The objective is not to impose a single model but to enable what is useful, measurable and sustainable. This model applies equally to the design of new wastewater treatment plants and the deep transformation of existing infrastructures, depending on territorial needs.

By optimising the use of existing infrastructures, Valoriise allows:

• Lower operating costs, notably through on-site energy production;
• Reduced heavy capital expenditure by prioritising the transformation of existing equipment;
• Reinforced energy autonomy for territories and stabilised long-term spending;
• Tangible, visible local benefits for residents.

This approach addresses rising citizen expectations regarding transparency and anticipation.