Julien CouvidatInstitut National des Sciences Appliquées de Lyon | INSA Lyon · Jean-Luc Bertrand-Krajewski's Lab
I'm looking for a new position of assistant/associate professor, or senior lecturer.
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
I'm currently working on the DESIR project, which aims to evaluate the sustainable management techniques for urban sediments coming from stormwater basins. My research interests are embracing sediments geochemistry, remediation techniques and valorization potential of sediments, biogeochemistry of urban contaminants (metals, PAH, PCB, pesticides, alkylphenol…). I'm also experienced in the environmental evaluation of solid materials, especially construction materials.
January 2020 - present
- PostDoc Position
- As a Post-doc researcher, I'm conducting a research on the DESIR project (initiated and supported by the RMC Water Agency). Our goal is to develop and assess sustainable strategies about sediments of stormwater retention and settling tank.
September 2018 - August 2019
Sediments contamination by organic and inorganic pollutants presents a serious risk to human health, fauna, and flora. Stabilization/solidification (S/S) is one of the most used techniques for the management of contaminated sediments. It aims to improve the mechanical and geochemical properties of contaminated sediments by adding cementitious mater...
Materials containing ground granulated blast furnace slag (GGBFS) display a transient green-blue color after demolding. This greening effect have been investigated for leaching behavior and ecotoxicological impact. Color of concretes and pure pastes containing GGBFS was assessed with a portable spectrophotometer, and samples were then submitted to...
The "greening effect" refers to hardened concrete containing Granulated Blast-Furnace Slag (GBFS) that displays a vivid blue-green color after removal of formwork. This temporary coloration effect, which fades within a few days to weeks, has raised concerns about its potential impact on the environment. Three types of leaching tests were conducted...
When dredged from water, marine sediments are highly reactive, thus their bio-geochemical behavior has to be appreciated so as to limit spreading of polluted leachates in the surrounding ecosystems. In this context, it is essential to assess the main the impact of bio-physicochemical factors [1, 2, 3]. In this research, two marine sediments were co...
Millions of tons of contaminated sediments are dredged each year from the main harbors in France. When removed from water, these sediments are very reactive, therefore their geochemical behavior must be understood in order to avoid dispersion of contaminated lixiviates in the surrounding soils. In this objective, it is necessary to evaluate the pri...
Purpose - Metal mobility in contaminated marine sediments is largely controlled by low-soluble sulfides. In dredged sediments exposed to air and water, geochemical and microbial-mediated processes may enhance the weathering and leaching of hazardous contaminants, especially trace metals. The objective of the present study was to thoroughly characte...
Abamectin has been widely used in agriculture and animal husbandry. It has been shown that abamectin exposure could induce multiple toxic effects on non-target organisms, but the underlying mechanism is still largely unknown. In the current study, the mechanism of abamectin-induced cytotoxicity was investigated in mouse embryonic fibroblast cells....
In a context promoting waste sustainable management, dredged sediments are assessed for valorization as substitute for sand in non-structural cemented mortars. Full substitution of sand by total sediment revealed low mechanical performances at UCS testing, linked to a high porosity. However, mechanical strength was improved, and porosity reduced, b...
The management of harbors requires regular dredging, which generates millions of tons of marine sediments, contaminated to varying degrees with trace metals. Despite increasingly regulations and determinations to encourage sustainable management of these wastes, dumping at sea and landfill disposal are still extensively practiced. Through an experi...
Millions of tons of sediments are dredged every year leading to a need for a sustainable management. Both studied sediments, stored in anoxic conditions under a layer of water (raw sediment), and in oxic conditions submitted to natural weathering (weathered sediment), showed high contamination of copper, lead and zinc, concentrated mainly in the fi...
Contaminated dredged sediments are often considered hazardous wastes, so they have to be adequately managed to avoid leaching of pollutants. The mobility of inorganic contaminants is a major concern. Metal sulfides (mainly framboïdal pyrite, copper, and zinc sulfides) have been investigated in this study as an important reactive metal-bearing phase...
Retention and infiltration ponds (RP/IP) are used as an alternative technique for stormwater management since the ‘90s. Suspension matters drained during rainy episode settle at the bottom of the ponds and accumulate as sediments. Managers in charge of these structures usually consider the regular dredging as a mandatory task to maintain the storage, filtration and infiltration functions of stormwater. However, the lack of data and regulations leads to a legal and operational void concerning management of sediments from stormwater ponds. With the exception of dredged sediments legally considered as wastes from the time they are excavated, limiting the options for treatment and valorization. Their management generates a relevant cost for entities in charge, while sediments may constitute a valuable organic and/or mineral potential resource when it comes to reduce the exploitation of limited natural resources (aggregates, river sand, organic amendment...). However, the accumulation of inorganic (Cu, Pb, Zn, Cr, Cd, As…) and organic (PAH, PCB, alkylphenols, pesticides…) micropollutants during the normal functioning of urban stormwater ponds represent a major limitation to valorization possibilities, which is needed to be better handled. Main objectives of DESIR project are : i) Improve the knowledge of geochemical composition and behavior of urban ponds sediments, and their spatio-temporal variabilities, ii) Make an inventory of operational practices for the present management of stormwater sediments, iii) Determine the functions that these sediments, considered as neosoils, are carrying out (biological function, ecological, aesthetic, societal…) iv) Identify the management and valorization pathways of urban ponds sediments, and determine the most appropriate valorization options To reach these goals, a first part of the project consists to realize an up-to-date state-of-the-art to make an inventory of all the published scientific or operational works related to RP/IP sediments. If possible, unpublished works (data not published, internal reports) will be included. A synthesis will be produced, with the objective to determine the needs in research to complete the previously synthesized data. Finally, identification of current and future management options and their comparison will authorize to produce operational recommendations for the purpose of main actors of RP/IP management. Partners :INSA Lyon DEEP , LEHNA ENTPE, Grand Lyon, BRGM, VetAgroSup, Provademse, AERMC, GRAIE/OTHU Project Leader : INSA LYON – DEEP , Vincent CHATAIN & Julien COUVIDAT Funding : FRAMEWORK AGREEMENT for cooperation between the RMC water agency and the OTHU
This project focuses on the potential impact of the temporary greening effect which occurs in concretes and mortars containing blast furnace slag. The potential environmental impact will be evaluated with leaching tests, whereas the sanitary aspect will require the use of ecotoxicological essays. Both environmental and sanitary aspects will be assessed,