Nicolas Forquet

Nicolas Forquet

AgreenSkills session, year: 2nd session, 2016

Receiving laboratory: Montana State University – Center for Biofilm Engineering

Country of origin : France




Mobility project

Innovative modeling practices for microbial activity in constructed wetlands

Constructed wetlands are the leading technology for small communities’ wastewater treatment in France. Because the regulation is becoming more stringent, the technology needs improvements. An essential step is to gain more understanding on the root/biofilm interaction and how it influences key reactions like denitrification. The center for Biofilm Engineering is developing an innovative microscale experiment to investigate it using hollow fiber membrane and microsensors. My work will consist in the development of an existing numerical model to assist experimental results interpretation. This mechanistic model aims at describing the bi-directional substrate fluxes across biofilm and microbial reactions within. Expected outcomes are the development of a biofilm-based model more adequate to describe constructed wetlands complex microbial mechanisms. On the long term, simplified models will be derived from them and employed by designers to accelerate innovation.

Biography & research interests

I graduated from the National School for Water and Environmental Engineering (Strasbourg, France) in 2005. I obtained my PhD degree in 2009 at the University of Strasbourg under the guidance of Robert Mosé. My PhD work focuses on the understanding of multiphase flow in vertical flow sand filters and how it influences oxygen transfer. Another innovative approach that I developed during my PhD was the usage of electrical resistivity tomography for the monitoring of constructed wetlands. This was done at the Norwegian University of Life Sciences under the guidance of Helen French. Since 2009, I’m serving as research engineer at Irstea. Thanks to a large number of field work and exchange with wastewater treatment practioners through the EPNAC network, I have gained expertise on constructed wetlands for wastewater treatment. I also developed innovative imaging and monitoring technologies and advances modelling tools describing multiphase flow and clogging in constructed wetlands.
My aim is to gain better understanding of engineered ecological systems to support their development and sustainability. Transfer of this knowledge is also at the core of my approach.

Selected publications

Bisone, S., Clément, R., Forquet, N. (2017) Une méthodologie couplant mesures physiques et ponctuelles afin d’estimer la perméabilité d’un site destiné à l’infiltration d’eau usée traitée. Déchets Sciences et Techniques (74), 11 p.
Morvannou, A., Troesch, S., Esser, D., Forquet, N., Petitjean, A., Molle, P. (2017) Using one filter stage of unsaturated/saturated vertical flow filters for nitrogen removal and footprint reduction of constructed wetlands. Water Science and Technology, 76 (1), pp. 124-133.
Bisone, S., Gautier, M., Masson, M., Forquet, N. (2017) Influence of loading rate and modes on infiltration of treated wastewater in soil-based constructed wetland. Environmental Technology (United Kingdom), 38 (1), pp. 53-64.
*Kim, B., Forquet, N. (2016) Pore-scale observation of deposit within the gravel matrix of a vertical flow constructed wetland. Environmental Technology (United Kingdom), 37 (24), pp. 3146-3150.
Audebert, M., Oxarango, L., Duquennoi, C., Touze-Foltz, N., Forquet, N., Clément, R. (2016) Understanding leachate flow in municipal solid waste landfills by combining time-lapse ERT and subsurface flow modelling – Part II: Constraint methodology of hydrodynamic models. Waste Management, 55, pp. 176-190.
Petitjean, A., Forquet, N., Boutin, C. (2016) Oxygen profile and clogging in vertical flow sand filters for on-site wastewater treatment. Journal of Environmental Management, 170, pp. 15-20.
*Samsó, R., García, J., Molle, P., Forquet, N. (2016) Modelling bioclogging in variably saturated porous media and the interactions between surface/subsurface flows: Application to Constructed Wetlands. Journal of Environmental Management, 165, pp. 271-279.
Petitjean, A., Forquet, N., Choubert, J.-M., Coquery, M., Bouyer, M., Boutin, C. (2015) Land characterisation for soil-based constructed wetlands: Adapting investigation methods to design objectives. Water Practice and Technology, 10 (4), pp. 660-668.
Meyer, D., Chazarenc, F., Claveau-Mallet, D., Dittmer, U., Forquet, N., Molle, P., Morvannou, A., Pálfy, T., Petitjean, A., Rizzo, A., Samsó Campà, R., Scholz, M., Soric, A., Langergraber, G. (2015) Modelling constructed wetlands: Scopes and aims – a comparative review. Ecological Engineering, 80, pp. 205-213.
Forquet, N., Dufresne, M. (2015) Simple deterministic model of the hydraulic buffer effect in septic tanks. Water and Environment Journal, 29 (3), pp. 360-364.
Morvannou, A., Forquet, N., Michel, S., Troesch, S., Molle, P. (2015) Treatment performances of French constructed wetlands: Results from a database collected over the last 30 years. Water Science and Technology, 71 (9), pp. 1333-1339.
*Morvannou, A., Forquet, N., Vanclooster, M., Molle, P. (2013) Characterizing hydraulic properties of filter material of a vertical flow constructed wetland. Ecological Engineering, 60, pp. 325-335.
Fournel, J., Forquet, N., Molle, P., Grasmick, A. (2013) Modeling constructed wetlands with variably saturated vertical subsurface-flow for urban stormwater treatment. Ecological Engineering, 55, pp. 1-8.
*Vincent, J., Forquet, N., Molle, P., Wisniewski, C. (2012) Mechanical and hydraulic properties of sludge deposit on sludge drying reed beds (SDRBs): Influence of sludge characteristics and loading rates. Bioresource Technology, 116, pp. 161-169.
Forquet, N., French, H.K. (2012). Application of 2D surface ERT to on-site wastewater treatment survey. Journal of Applied Geophysics, 80, pp. 144-150.
Forquet, N., Boutin, C., Breul, P. (2012) Contrôle des installations d’assainissement non collectif : l’apport déterminant des outils de diagnostic non destructifs. Sciences Eaux et Territoires 9 : 98-101.
*Petitjean, A., Forquet, N., Wanko, A., Laurent, J., Molle, P., Mosé, R., Sadowski, A. (2012) Modelling aerobic biodegradation in vertical flow sand filters: Impact of operational considerations on oxygen transfer and bacterial activity. Water Research, 46 (7), pp. 2270-2280.
Petitjean, A., Wanko, A., Forquet, N., Mosé, R., Lawniczak, F., Sadowski, A. (2011) Diphasic transfer of oxygen in vertical flow filters: A modelling approach. Water Science and Technology, 64 (1), pp. 109-116.
Lénard, A., Forquet, N., Cauchl, A., Rolland, L., Breul, P., Besson, Lafforgue, A. (2010) Autopsies of small sewage treatment installations Dismantling of 5 of the 8 lines tested on the CSTB platform as part of the Véolia Eau comparative water study (Part 1) [Autopsies de petites installations d’assainissement démantè lement de 5 des 8 filières testées sur la plateforme du CSTB dans le cadre de l’étude comparative Veolia Eau (1ère partie)]. Eau, l’INDUSTRIE, les Nuisances, (334), pp. 62-73.
Forquet, N., Wanko, A., Molle, P., Mosé, R., Sadowski, A.-G. (2009) Two-phase flow modelling for oxygen renewal estimation in vertical flow filter: Luxury or necessity? Water Science and Technology, 59 (12), pp. 2311-2319.
Forquet, N., Wanko, A., Mosé, R., Sadowski, A.-G. (2009) Diphasic modelling of vertical flow filter. Ecological Engineering, 35 (1), pp. 47-56.
Wanko, A., Forquet, N., Mose, R., Sadowski, A.-G. (2006) Using fluorescence for a full spectral analysis of dissolved and gaseous oxygen within a sand bed. WIT Transactions on Ecology and the Environment, 95, pp. 369-378.