FLORENT CHAZARENC

FLORENT CHAZARENC
French National Institute for Agriculture, Food, and Environment (INRAE) | INRAE · Department of Ecotechnologies

Eng, Msc, PhD, Habilitation to direct research

About

65
Publications
25,328
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4,432
Citations
Citations since 2016
16 Research Items
2824 Citations
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20162017201820192020202120220100200300400
20162017201820192020202120220100200300400

Publications

Publications (65)
Presentation
Full-text available
COME JOIN US IN LYON! The IWA 17th International Conference on Wetland Systems for Water Pollution Control (ICWS2022) is being held in Lyon, France from 6 - 10 November 2022. Abstract submission is open now through August 15 (hard deadline, no extensions!)
Article
Full-text available
The scope of this study was to investigate if using zeolite as a reactive material in a vertical-flow wetland under field conditions improves ammonium removal from domestic wastewater in the long term. The experimental setup consisted of two pilot-scale first stage French vertical flow treatment wetlands (2.3 m2 surface area each), which were imple...
Article
Full-text available
Treatment wetlands for raw wastewater from small communities (< 2000 p.e.) represent 20% of the wastewater treatment plants in France today. The classical French Vertical Flow Treatment Wetland consists of two stages filter beds intermittently fed with raw wastewater (inflow concentrations TSS 387 ± 70 mg/L, COD 880 ± 188 mg/L, TKN 110 ± 16 mg/L)....
Article
Bioaugmentation in the form of artificial mycorrhization of plant roots and bacterial inoculation has been successfully implemented in several fields including soil remediation or activated sludge treatment. Likewise, bioaugmentation seems a promising approach to improve the functioning of treatment wetlands, considering that natural mycorrhization...
Article
Full-text available
The performance of 14 large pilot-scale horizontal flow wetlands (~ 60 m2 each) designed to treat polluted river water was tested in a 3-year study at the Chenshan Botanical Garden in Shanghai, China. Five local species, Arundo donax, Cyperus alternifolius, Phragmites australis, Thalia dealbata and Typha orientalis, were planted in monocultures and...
Article
Climate-related issues constitute an important obstacle for the development of treatment wetland (TW) applications in regions with freezing winter temperatures. The aim of the present study was to evaluate the efficiency of a new configuration of TWs based on the vertical flow (VF) configuration. The proposed TWs system is planted with a willow spe...
Article
Full-text available
Plant species selection is an important criterion for improving treatment wetland performance. The aim of this work was to evaluate removal efficiency and potential uses of woody species in treatment wetlands during the establishment year. Plant development, removal efficiency and evapotranspiration rate of five woody species (Salix interior, Salix...
Article
The main aim of our study was to construct a two-stage vertical flow constructed wetland (VFCW) system to treat single household raw sewage water in India under tropical climate. For selecting the plant species different sets of lab experiments were carried out. Two different plant species (Typha angustata and Canna indica) were considered for thei...
Article
Steel slag filters, if well designed and operated, may upgrade phosphorus removal in small wastewater treatment plants such as stabilization ponds and constructed wetlands. The main objective of this study was to develop a systemic modelling approach to describe changes in the hydraulic performances and internal hydrodynamics of steel slag filters...
Chapter
A wide range of ecotechnologies has been applied to treatment of variable stormwater and wastewater flows. Stormwater ponds and basins were already introduced as common ‘end-of-the-pipe’ treatment solutions in the 1960s, almost parallel to the first attempts to develop structured wastewater treatment with the help of plants, inspired by natural wet...
Book
This book provides an essential overview of ecotechnologies (also known as green infrastructure or nature-based solutions) which are considered to be relatively resilient to variations in stormwater and wastewater inflow. In particular, it focuses on various types of constructed wetlands, biofilters and ponds. Stormwater flows are inherently variab...
Chapter
Constructed wetlands (CWs) subjected to variable loads present a series of challenges for designers and researchers. Classical design approaches (e.g. rule of thumbs or first-order kinetic model) are not suited to properly estimate the removal efficiencies of CW under varying flows. The internal removal processes of CWs are expected to be influence...
Article
Full-text available
The objective of this study was to determine how macrophytes commonly used in treatment wetlands (TWs) respond to water with low pollutant concentration. We measured pollutant removal efficiency and compared growth and nutrient uptake of five macrophytes in demonstration scale units (volume >40 m3) irrigated by water with pollutant concentrations r...
Article
This simulation study investigates the treatment performance of a compact French Vertical Flow wetland using a zeolite layer in order to increase ammonium nitrogen removal. For the modelling exercise, the biokinetic model CW2D of the HYDRUS Wetland Module is used. The calibrated model is able to predict the effect of different depths of the zeolite...
Article
Full-text available
This study aimed at determining the treatment performances of a full scale VFCWs designed to treat wastewater from a food-processing industry (cookie factory), and to study the influence of the organic loading rate. The full scale treatment plant was designed with a first vertical stage of 630 m², a second vertical stage of 473 m² equipped with a r...
Article
The present research investigates the uptake of phosphate ions from aqueous solutions using acidified laterite (ALS), a by-product from the production of ferric aluminium sulfate using laterite. Phosphate adsorption experiments were performed in batch systems to determine the amount of phosphate adsorbed as a function of solution pH, adsorbent dosa...
Article
The aim of this study was to investigate the feasibility of using a floating treatment wetland for removal of dissolved metals from urban runoff under full-scale conditions. The study site is a retention pond located in northeast Nantes (France) that receives the storm water runoff from a section of highway (27,000 vehicles/day, basin surface 375 m...
Article
Electric arc furnace steel slag (EAF-slag) and basic oxygen furnace steel slag (BOF-slag) were used as filter substrate in horizontal subsurface flow laboratory-scale filters designed to remove phosphorus (P) from a synthetic solution (similar to 10 mg P/L). The main objective of this study was to evaluate the influence of various parameters, inclu...
Article
Raw biogas, produced by anaerobic digestion of organic matter, is a methane-rich combustible gas. The CH4 content can be upgraded to reach the natural gas composition for vehicle fuel use (bio-CNG) or injection into the gas grid. This upgrading is performed by CO2 removal and pollutants treatment (H2S, water, etc.). The accelerated carbonation on B...
Article
Full-text available
The influence of tubificid worms on nutrient translocation from water to fish farm sediments accumulating in settling ponds was addressed under laboratory conditions. Small microcosms of 0.5 L were filled up with 35 g of sludge from a fish farm settling pond and 0.15 L of filtered settling pond water. The experimental set up consisted of one contro...
Article
Bio-NGV (bio-Natural Gas for Vehicles) is a bio-fuel from biogas in which components such as CO2 and H2S had to be removed. The economical feasibility of available and commercial technologies to perform these removals is limited to 80 Nm3/h of treated biogas. However, the fuel needs of 1 fill-up per day would represent the treatment of only 1 Nm3/h...
Article
Full-text available
Plants are assumed to play a central role in sludge treatment wetlands (STWs) by preventing clogging, favouring dewatering and improving sludge mineralisation. However, few comparative studies have been made to assess the influence of plants presence or species on the treatment of sludge in STWs. Therefore, the aim of this study was to evaluate the...
Article
Full-text available
Upgrades to enhance nitrogen removal were tested in a 2 year old pilot vertical flow constructed wetland in spring and summer periods. The effects of a saturated layer and of recirculation were tested in particular. Two pilots (L = 2 m, W = 1.25 m, H = 1.2 m), filled with expanded schist (Mayennite(®)), were designed with hydraulic saturated layers...
Article
Conventional stormwater detention ponds frequently show limitations for dissolved heavy metal removal. Floating treatment wetlands (FTWs), a variant of constructed wetlands, are considered as a promising technology to improve the quality of urban stormwater runoff. Our study aimed at evaluating the treatment performances of FTWs for cadmium, nickel...
Article
Electric arc furnace steel slag (EAF-slag) and basic oxygen furnace steel slag (BOF-slag) were used as filter substrates in two horizontal sub-surface flow filters (6 m3 each) designed to remove phosphorus (P) from the effluent of a constructed wetland. The influences of slag composition, void hydraulic retention time (HRTv), temperature, and waste...
Article
Full-text available
Sludge treatment wetlands are mainly used to reduce the volume of activated sludge, and the pollutants at the outlet are generally returned to the wastewater treatment plant. However, in cases where sludges are produced far from treatment plants not only must the sludge be treated, but the discharge of pollutants into the surrounding environment mu...
Article
Full-text available
Rapid infiltration systems are effective at removing nutrients from wastewater, and their purification efficiency can be improved by using selected substrates. We evaluated the effects of different substrates (sand mixed with 1, 3, 5 or 7% of cinder, diatomite, active carbon or fly ash) on nutrient removal of poultry wastewater capacities. The set...
Article
Electric arc furnace steel slags (EAF-slags) and basic oxygen furnace steel slags (BOF-slags) were used to remove phosphate from synthetic solutions and real wastewater. The main objective of this study was to establish an overview of the phosphate removal capacities of steel slags produced in Europe. The influences of parameters, including pH, and...
Article
The concentrations of heavy metals in water, sediments, soil, roots, and shoots of five aquatic macrophytes species (Oenanthe sp., Juncus sp., Typha sp., Callitriche sp.1, and Callitriche sp.2) collected from a detention pond receiving stormwater runoff coming from a highway were measured to ascertain whether plants organs are characterized by diff...
Article
Two sets of experiments were carried out to assess the net advantage of treating the sludge generated during fish production with sludge drying beds (SDBs). The first experiment consisted of monitoring the concentration of o-PO4-P and total phosphorus (TP) at the effluent of four 1 m2 SDB. The SDBs were set up in a fish farm facility and were fed w...
Article
This paper aims to collect and analyse existing information on different filter media used for phosphorus (P) removal from wastewater in constructed wetlands. The most commonly used materials are categorized as natural materials (considered in 39 papers), industrial byproducts (25 papers) and man-made products (10 papers). A majority of studies on...
Article
Full-text available
Freshwater fish farms in Quebec are facing stringent phosphorus discharge limits of 4.2kg P per tonne of fish produced. Most phosphorus in fish farm effluents is found in particulate form (uneaten food, feces, etc.). Physical separation systems such as microscreens, filter beds, Cornell-type circular tanks and settling tanks have been proposed to r...
Article
Full-text available
Hydroponics culture generates large amounts of wastewater that are highly concentrated in nitrate and phosphorus but contains almost no organic carbon. Constructed wetlands (CWs) have been proposed to treat this type of effluent, but little is known about the performance of these systems in treating hydroponic wastewater. In addition, obtaining sat...
Article
Full-text available
Laboratory scale studies have repeatedly reported high P-retention in slag, a by-product of the steel manufacturing industry. Thus, it has emerged as a potential material to increase P-removal from constructed wetlands (CWs). However, several limitations were highlighted by field experiments, including the high pH of treated water and clogging. We...
Article
Full-text available
Evapotranspiration (ET) in constructed wetlands (CWs) represents a major factor affecting hydrodynamics and treatment performances. The presence of high ET was shown to improve global treatment performances, however ET is affected by a wide range of parameters including plant development and CWs age. Our study aimed at modelling the effect of plant...
Article
Full-text available
In constructed wetlands, microorganisms associated with plants are assumed to play a major role. A one-year survey was conducted in five vertical flow constructed wetland systems that had been operating from 2 months to 8 years in small French villages (100–500 People Equivalent) to provide a better understanding of microbiological activity. The ob...
Article
Full-text available
While the positive role of macrophytes on removal efficiency in constructed wetlands has been well established, possible differences in performance between plants species of comparable life forms and sizes are much harder to demonstrate. We reviewed 35 experimental studies published in peer-reviewed journals and proceedings on the effect of macroph...
Article
Full-text available
This review summarizes the microbial mechanisms responsible for removal of carbon, nitrogen, and sulfur compounds in treatment wetlands (TWs) and identifies, categorizes and compares various techniques, from plate count to more modern genomic methods used to elucidate these mechanisms. Removal of a particular pollutant is typically associated with...
Article
Full-text available
In constructed wetlands, solids accumulation may have two consequences with opposing effects on treatment efficiency: it decreases the longevity by reducing void space and it enhances biological activity by favoring biofilm development. The goal of our study was to estimate the effect of plants (presence and species) and artificial aeration on soli...
Article
Full-text available
This article deals with the use of ASPEN PLUS to model the thermo chemical processes occurring in wood biomass gasifiers. An original equilibrium gasification model using ASPEN PLUS was first built and validate based on existing data of a downdraft gasifier (DDG). The thermo chemical models assume that reactants reach chemical equilibrium. The simu...
Article
Greenhouse gas (GHG) emissions by constructed wetlands (CWs) could mitigate the environmental benefits of nutrient removal in these man-made ecosystems. We studied the effect of 3 different macrophyte species and artificial aeration on the rates of nitrous oxide (N(2)O), carbon dioxide (CO(2)) and methane (CH(4)) production in CW mesocosms over thr...
Article
Nitrogen (N) processing in constructed wetlands (CWs) is often variable, and the contribution to N loss and retention by various pathways (nitrification/denitrification, plant uptake and sediment storage) remains unclear. We studied the seasonal variation of the effects of artificial aeration and three different macrophyte species (Phragmites austr...
Conference Paper
Full-text available
In treatment wetlands for domestic wastewater disposal, a considerable decrease in phosphorus removal is generally observed after 3-4 years following the startup. Treatment wetlands performances have to be upgraded more and more often by directing durably discarded P according to requirements. The use of high P-capacity media was identified as a ma...
Article
Full-text available
We studied the contribution of artificial aeration, loading rate, and macrophyte species on pollutant removal in horizontal subsurface flow constructed wetlands (HSSFCWs) treating reconstituted trout farm wastewater. Twelve 1 m2 mesocosms located in a controlled greenhouse environment were used to test two species of macrophytes (Phragmites austral...
Article
Full-text available
The effect of organic loading, season and plant species on the treatment of fish farm effluent was tested using three-year old mesocosm wetland systems. During one year, nine 1 m2 mesocosms (horizontal subsurface flow), located in a controlled greenhouse environment, were fed with a reconstituted fish farm effluent containing a high fraction of sol...
Article
Full-text available
The current best option to upgrade constructed wetlands (CWs) for phosphorus (P) retention, in terms of efficiency, cost and simplicity, consists in using media having a strong P affinity. The media can be used either in the planted beds or in a filtration system downstream of the beds. The use of slag filters was shown to be efficient for removing...
Article
Full-text available
It is often assumed that planted wastewater treatment systems outperform unplanted ones, mainly because plants stimulate belowground microbial population. Yet, fundamental interactions between plants and associated microorganisms remain only partly understood. The aim of our project was to evaluate microbial density and activity associated to the r...
Article
Full-text available
Tracer studies performed in two aerated facultative lagoons indicate some bypass and an overall hydraulic regime close to completely-mixed. Results were used to calibrate a hydraulic model based on the tanks-in-series approach. The hydraulic model was combined with a simple "death-regeneration" biokinetic model to simulate seasonal nitrification as...
Article
Natural apatite has emerged as potentially effective for phosphorus (P) removal from wastewater. The retention capacity of apatite is attributed to a lower activation energy barrier required to form hydroxyapatite (HAP) by crystallization. The aim of our study was to test the P removal potential of four apatites found in North America. Minerals wer...
Article
In horizontal subsurface flow constructed wetlands, oxygen availability, which is frequently low in summer, may be even more limiting in winter when the plants are dormant. We tested the contribution of artificial aeration on pollutant removal in summer and winter, with a combination of planted, unplanted, aerated and non-aerated mesocosms treating...
Article
Full-text available
In France, gravel vertical flow constructed wetlands (gVFCWs) were adapted to treat raw wastewater, which led to important accumulations of matter in filters (organic and mineral). To prevent clogging, large gravel sizes were employed (O 2-6 mm). The aim of this paper was to present the influences of matter accumulation on the hydraulic and biologi...
Article
Full-text available
Constructed wetland hydrodynamics were modeled using mathematical tools generally employed in chemical engineering processes. The hydraulic residence time (HRT) distributions of the subsurface horizontal flow constructed wetland from Curienne (France) were estimated using the impulsion tracer method. A non-ideal flow wetland was first modeled by cl...