Application of the multi-barrier approach for treated wastewater reuse :

Alice-Rose Thomas’s thesis work focused on the contribution of a collective construction of microbiological risks management for treated wastewater reuse (TWR). Using a participatory simulation tool co-constructed with the emblematic case of Clermont-Ferrand, the stakeholders in a TWR work together to construct microbiological risk management scenarios and discuss the associated health, economic and organisational impacts. This tool, called MUTLIWARE, includes a quantitative risk assessment model (QMRA) and a database of barrier measures that help to reduce risks throughout the water reuse system. Collective construction contributes to the sharing of scientific and operational knowledge, expectations and needs, as well as individual perceptions of risks and risk management. It thus produces a set of elements needed to build a risk management system that is proactive, integrated and adapted to local constraints, while meeting regulatory requirements.