This report presents the state of the art in processes for concentrating aqueous industrial effluents. The processes studied are thermal evapoconcentration processes, membrane processes, mechanical processes and physico-chemical processes. For each of these processes, the work carried out provides information that is : - technical: physical phenomena involved, principle of the process, - practical: fields of application, advantages, performance, limits and disadvantages, - economic: data on energy consumption, economic data (costs of installations, consumables, maintenance operations). Specific case studies are detailed: leachates from storage centres, mechanical engineering and surface treatment effluents, and methanisation digestates. This document also provides a reminder of the regulations governing effluents and current effluent discharge standards, as well as the conditions for admitting liquid waste to treatment centres. This report helps to identify a dedicated strategy (resulting from a combination or otherwise of different processes), in order to provide an optimum technical and economic solution for a given facility.
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