Treatment of Complex effluent ad emerging contaminants by a compact process coupling wet air oxidation with a biofilm reactor (thèse 2016 - 2019)
Activités
oxydation en voie humide,
réacteur à biofilm,
traitement des eaux usées.
Publications scientifiques au M2P2
2020
Dan Feng, Laure Malleret, Audrey Soric, Olivier Boutin. Kinetic study of glyphosate degradation in wet air oxidation conditions. Chemosphere, 2020, 247, pp.125930. ⟨10.1016/j.chemosphere.2020.125930⟩. ⟨hal-02892476⟩ Plus de détails...
Glyphosate is one of the most widely used herbicides in the world against perennial and annual weeds. It has been reported to be a micro pollutant, and its degradation in different wastewater treatment processes must be studied. For that purpose, the kinetics of wet air oxidation of glyphosate was studied in an autoclave reactor at a temperature range of 423-523 K and under a total pressure of 15 MPa. Oxidation reactions obeyed the first-order kinetics with respect to glyphosate concentration. The activation energy for glyphosate oxidation was found to be equal to 68.4 kJ mol(-1). Furthermore, the possible reaction intermediates and main end products of glyphosate degradation in the wet air oxidation process were identified and quantified using UV-spectrophotometry and liquid chromatography coupled to high resolution mass spectrometry. A degradation pathway for glyphosate oxidation was proposed.
Dan Feng, Laure Malleret, Audrey Soric, Olivier Boutin. Kinetic study of glyphosate degradation in wet air oxidation conditions. Chemosphere, 2020, 247, pp.125930. ⟨10.1016/j.chemosphere.2020.125930⟩. ⟨hal-02892476⟩
Dan Feng, Laure Malleret, Guillaume Chiavassa, Olivier Boutin, Audrey Soric. Biodegradation capabilities of acclimated activated sludge towards glyphosate: Experimental study and kinetic modeling. Biochemical Engineering Journal, 2020, 161, pp.107643. ⟨10.1016/j.bej.2020.107643⟩. ⟨hal-02960167⟩ Plus de détails...
The acclimation process of activated sludge from a wastewater treatment plant for degradation of glyphosate and its biodegradation kinetics were studied in a batch reactor. The parameters monitored included the concentrations of glyphosate, as well as aminomethylphosphonic acid (AMPA), its main metabolite, total organic carbon (TOC), pH, dissolved oxygen (DO) and biomass concentration. M the end of the acclimation process, glyphosate removal efficiency of the acclimated sludge was compared to the fresh sludge one. The results showed that the acclimation process highly increased degradation efficiency. Complete glyphosate removal has been achieved during kinetics experiments. Glyphosate removal kinetic of the acclimated sludge was modeled by Monod model that accurately fitted the experimental results with a maximum growth rate (mu(max)) of 0.34 h(-1) and half-saturation constant (K-s) of 1600 mg L-1. Finally, a biodegradation pathway of glyphosate used as carbon source was proposed.
Dan Feng, Laure Malleret, Guillaume Chiavassa, Olivier Boutin, Audrey Soric. Biodegradation capabilities of acclimated activated sludge towards glyphosate: Experimental study and kinetic modeling. Biochemical Engineering Journal, 2020, 161, pp.107643. ⟨10.1016/j.bej.2020.107643⟩. ⟨hal-02960167⟩
Dan Feng, Audrey Soric, Olivier Boutin. Treatment technologies and degradation pathways of glyphosate: A critical review. Science of the Total Environment, 2020, 742, pp.140559. ⟨10.1016/j.scitotenv.2020.140559⟩. ⟨hal-02960128⟩ Plus de détails...
Glyphosate is one of the most widely used post-emergence broad-spectrum herbicides in the world. This molecule has been frequently detected in aqueous environment and can cause adverse effects to plants, animals, microorganisms, and humans. This review offers a comparative assessment of current treatment methods (physical, biological, and advanced oxidation process) for glyphosate wastewaters, considering their advantages and drawbacks. As for other molecules, adsorption does not destroy glyphosate. It can be used before other processes, if glyphosate concentrations are very high, or after, to decrease the final concentration of glyphosate and its by-products. Most of biological and oxidation processes can destroy glyphosate molecules, leading to by-products (the main ones being AMAP and sarcosine) that can be or not affected by these processes. This point is of major importance to control process efficiency. That is the reason why a specific focus on glyphosate degradation pathways by biological treatment or different advanced oxidation processes is proposed. However, one process is usually not efficient enough to reach the required standards. Therefore, the combination of processes (for instance biological and oxidation ones) seems to be high-performance technologies for the treatment of glyphosate-containing wastewater, due to their potential to overcome some drawbacks of each individual process. Finally, this review provides indications for future work for different treatment processes to increase their performances and gives some insights into the treatment of glyphosate or other organic contaminants in wastewater.
Dan Feng, Audrey Soric, Olivier Boutin. Treatment technologies and degradation pathways of glyphosate: A critical review. Science of the Total Environment, 2020, 742, pp.140559. ⟨10.1016/j.scitotenv.2020.140559⟩. ⟨hal-02960128⟩
Dan Feng, Jean-Henry Ferrasse, Audrey Soric, Olivier Boutin. Bubble characterization and gas–liquid interfacial area in two phase gas–liquid system in bubble column at low Reynolds number and high temperature and pressure. Chemical Engineering Research and Design, 2019, 144, pp.95-106. ⟨10.1016/j.cherd.2019.02.001⟩. ⟨hal-02177001⟩ Plus de détails...
Bubbles hydrodynamic in gas-liquid contactor, including bubble size distribution, bubble size and gas-liquid interfacial area, was evaluated as a function of superficial gas velocity, superficial liquid velocity, temperature, pressure and different gases (N-2 and He) and liquids (water and ethanol/water mixture) phases. The results showed that with the increase of superficial gas velocity, the bubble size distribution shifted from smaller- to larger-size bubble and the Sauter mean diameter, the gas holdup and the interfacial area generally increased due to the increase of coalescence. The effect of superficial liquid velocity on bubble characteristics was not significant. Pressure and temperature showed slight influence on gas holdup and interfacial area. The bubble characteristics were not significantly influenced by the type of gas phase, but mainly affected by the liquid composition. Correlations to predict Sauter mean bubble diameter and the gas holdup are developed using Kanaris correlation and in good agreement with experimental results.
Dan Feng, Jean-Henry Ferrasse, Audrey Soric, Olivier Boutin. Bubble characterization and gas–liquid interfacial area in two phase gas–liquid system in bubble column at low Reynolds number and high temperature and pressure. Chemical Engineering Research and Design, 2019, 144, pp.95-106. ⟨10.1016/j.cherd.2019.02.001⟩. ⟨hal-02177001⟩
