Treatment of aqueous effluents by injection of carbon dioxide
AssigneeL'Air Liquide, Societe Anonyme pour l'Etude et l'Exploitation des Procedes Georges Claude
InventorJean-Mathieu de Rigaud
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Abstract
The present invention relates to a process for treating more or less concentrated aqueous effluents, such as processing waters, industrial or urban waste waters, and sludges, in particular sludges derived from these waste waters. The said process comprises at least one step of physical separation of a liquid phase and of a solid phase dispersed in the said liquid phase and at least one addition of chemical conditioning reagents and optionally of antifoaming agents. The process also comprises the injection of carbon dioxide (CO2) into the said treated aqueous effluents, in an amount which is sufficient to give them a pH of less than 7.8.
Claims23
A process for treating more or less concentrated aqueous effluents, said process comprising at least one step of physical separation of a liquid and of a solid phase dispersed in said liquid phase and at least one addition of chemical conditioning reagents and optionally of antifoaming agents, wherein it also comprises the injection of carbon dioxide (CO2) into said treated aqueous effluents, in an amount which is sufficient to give them a pH of less than 7.8., and wherein, before the injection of said CO2, the effluents are pre-neutralized at a pH between about 8 and 8.5.
Dependencies are inferred from the claim text.