Présentations Colloques

Session 6.02: Treated WasteWater REUSE for groundwater recharge: addressing the challenge
Azaroual (orateur)
Soil Aquifer Treatment in coastal areas
Soil Aquifer Treatment (SAT) is one of the broad collection of practices for groundwater recharge and storage for its recovery. Climate change, population growth and economic development may be behind the acute tension over water resources, particularly in coastal areas where population increases. In these areas, recourse to new sources of water has to be considered in order to secure water supply for drinking, irrigation, tourism and domestic using. Artificial groundwater recharge using different water resources (desalted waters, river waters, treated wastewater, etc.) appears as one of major solution to the recurrent issue of water scarcity and supply security. It is also potentially a pragmatic way to store and restore water in the environment allowing to- i) maintain necessary water supply levels, ii) alleviate salt water intrusion into coastal aquifers, iii) store water avoiding evaporation as it happens for dams, and iv) make it available at any time for all needs.**Collaborative projects have been developed by BRGM and Veolia since 2006 aiming to develop concepts and transferable technology for SAT based on the control of the key physical, microbiological and chemical processes. As the successful establishment of a particular aquifer cannot be reproduced elsewhere due to different hydrogeological and geochemical settings, climate conditions and economic contexts, great care has to be made to ensure the success of any given SAT scheme. Every aquifer recharge design is highly specific, and must encompass a number of scientific disciplines (geology, hydrogeology, geophysics, geochemistry …). Indeed, the reactive transport modelling is often carried out in order to identify the relevant processes controlling the filtration capability (permeability) of the soil, the compatibility of injected water with soil mineral reactivity (i.e., favourable water - rock interactions) and the design of permeable reactive barriers.**