Local solutions to local challenges


FILNOV : a greener filtration system

In France, about five million homes are equipped with an on-site wastewater treatment system (OWTS), which represents 20% of the population. Recent regulatory developments have opened up a range of possibilities for possible treatment systems for treating wastewater.

In this context, ITREN has been working for 10 years to develop a system for treating domestic wastewater from lignocellulosic biomass derived from by-products of local agriculture: FILNOV. Indeed, finding local solutions allows, on the one hand, the reduction of the carbon footprint due to the transport of the material, and on the other hand, an adaptation of FILNOV to any geographical context (national or international).

Sustainable development

Treatment of domestic wastewater exclusively with natural agro-industrial by-products.

Local entrepreneurial spirit

Involving local farmers, reducing the carbon footprint.

Environmental innovation

Innovative bench and lab-pilot tests are used to determine potentials materials for biofiltration.


Materials are used as is; no chemical changes are performed, physical transformations if necessary.

The filter developed is involved in the solving of the dual problem of on-site wastewater treatment system (OWTS) and the valorization of agro-industrial by-products. The idea is to propose alternative solutions to the classical materials used in such treatment processes (peat, coconut, among others) which are hardly available while maintaining equivalent or superior performances. The system includes an all-water pit that allows the collection and pretreatment of raw wastewater, then the filtration module in which the effluent is actively treated aerobically, independently, without any electromechanical equipment.

The system allows treating all wastewater on-site while ensuring respect for the environment and reject standards.

Our research partners

For more than 10 years of research with the Laboratory of Agro-Industrial Chemistry (UMR 1010), the Laboratory of Chemical Engineering (UMR 5503) and the support of Véolia Water and the ANRT, we have determined innovative bench tests to determine if the locally grown fiber is suitable for wastewater filtration. Our goal is to bring the rural world closer to the urban world by involving farmers in a sustainable approach. This filtration process makes it possible to recycle lignocellulosic by-products that could not be recovered beforehand. Two PhD theses have been completed for the development of technology (Breton, 2013, Villalobos García, 2018). Experts in the field, situate the degree of maturity of this technological innovation between 5 and 6 in the scale TRL (Technology Readiness Level).