Treatment of biorefractory liquid Effluent by coupling Membrane Processes and wet air Oxidation – TEMPO
The TEMPO project takes place in the frame of water resources polluted by effluents/wastewaters containing non-biodegradable organic compounds. Attention will be focused on the treatment of effluents from the pharmaceutical industry, hydrocarbon effluents from the petrochemical industry, landfill leachates and greywater. The objective is to propose an innovative, global, reliable, intensified and sustainable treatment system for these bio-refractory effluents. The treatment line consists of membrane processes (ultrafiltration or reverse osmosis) that guarantee excellent permeate quality while concentrating the pollution and then of wet air oxidation (non-catalytic WAO) aimed at mineralizing the membrane concentrates. While the two processes alone are well known, the coupling of the two is innovative, bringing new perspectives of technological, economic and environmental efficiency. The coupling makes it possible to greatly minimize the disadvantage of the management of the membrane concentrates when membrane processes are used alone and the disadvantage of the severe operating conditions of the WAO. In other words, the global treatment process line developed in this project opens the possibility of discharging everything into the environment by respecting the standards and norms. It makes it possible to respond to the energy problem of WAO by concentrating the effluents as much as possible by membrane processes in order to reduce the volumes to be treated and therefore the energy consumptions required by increasing the process's autothermicity. This global non-biodegradable effluent treatment process is truly innovative since very few publications mention laboratory-scale tests and no industrial company offers this treatment.
The feasibility has been demonstrated on synthetic effluents, thus minimizing the risks of such a project, the first scientific and technological lock is therefore to validate it in terms of technological, energy, economic and environmental efficiency on complex real effluents. The second scientific lock is to understand the interactions and interdependencies between the two processes. A design of experiments will study the influence of refractory compounds concentrations, transmembrane pressure, temperature / pressure / reaction time in WAO in order to optimize these operating conditions and predict the performances according to the type of effluent to be treated. From all the effluents considered, it is expected a macroscopic selection tool (decision tree) to highlight the most relevant operating conditions to meet the objectives. The objectives through this project are: maximal removal efficiency (membrane retention and mineralization) in targeted pollutant, minimal energy consumption and minimal consumption of chemicals (minimum operating costs), minimal toxicity of effluent to be discharged (toxicity linked to oxidation by-products). Analytical techniques to identify oxidation by-products will be developed to understand the performance of the developed process and the potential of discharge into the environment. Through this study, it is hoped a better understanding of the interdependence of the operating parameters on the performance of the coupling. The hybrid process thus developed, and the results obtained will be used in a process simulation work to predict the performance on an industrial scale depending on the type of effluent considered. This JCJC TEMPO project appears to be efficient with a relationship between the objectives to be achieved through the creation of a new research axis carried by a young researcher and the resources used to achieve them that are present separately in the environment of this researcher.
Monsieur Mathias MONNOT (Laboratoire de Mécanique, Modélisation et Procédés Propres)
The author of this summary is the project coordinator, who is responsible for the content of this summary. The ANR declines any responsibility as for its contents.
M2P2 Laboratoire de Mécanique, Modélisation et Procédés Propres
Help of the ANR 292,950 euros
Beginning and duration of the scientific project: December 2019 - 48 Months