|Coordinators : Rémi CLEMENT, Laura DELGADO-GONZALEZ|
|Activity period : 2021 – 2023
Funding : DEB
Partners : RAE, Pierre et Terre, LEHNA, University of Rennes
In partnership with the French Ministry of Ecological Transition, the REVERSAAL research unit is coordinating a study on maintaining the infiltration capacity of soils, applied to treated wastewater (TWW) infiltration surfaces. The main operational objective of this project is to evaluate the evolution of the infiltration capacity of TWW in the soil using an intermediate organic support or amendment, the wood-chips (WC). The use of WC would, among other things, lead to a localised enrichment of the ecosystem, which would have a positive impact on the infiltration capacity of TWW in the soil, by minimising the effects of clogging over time. The main scientific objective will therefore be to understand the interactions between the soil, the organic amendment (the WC) and the macrofaune, and their effect on the evolution of the infiltration capacity of the soil and on the purification capacity.
The work is carried out on two scales: in the field, measurement campaigns aimed at evaluating existing wood-chip filters in households and determining their viability in the infiltration of wastewater; in the laboratory, with the setting up of pilots under controlled conditions and subjected to treated wastewater in order to understand the evolution of the biogeochemical mechanisms for infiltration and the potential for additional treatment in wood-chip filters.