Application of sludge-based carbonaceous materials in a hybrid water treatment process based on adsorption and catalytic wet air oxidation |
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Authors: | Carine Julcour Lebigue Caroline Andriantsiferana Catherine Ayral Elham Mohamed Anne-Marie Wilhelm Henri Delmas Laurence Le Coq Claire Gerente Karl M Smith Suangusa Pullket Geoffrey D Fowler Nigel JD Graham |
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Institution: | 1. Université de Toulouse, Laboratoire de Génie Chimique, UMR CNRS 5503, 4, allée Emile Monso, BP 84234, 31432 Toulouse Cedex 4, France;2. GEPEA UMR 6144, Ecole des Mines de Nantes, 4 rue Alfred Kastler, 44307 Nantes Cedex 3, France;3. Department of Civil and Environmental Engineering, Imperial College London, South Kensington Campus, London SW7 2AZ, UK |
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Abstract: | This paper describes a preliminary evaluation of the performance of carbonaceous materials prepared from sewage sludges (SBCMs) in a hybrid water treatment process based on adsorption and catalytic wet air oxidation; phenol was used as the model pollutant. Three different sewage sludges were treated by either carbonisation or steam activation, and the physico-chemical properties of the resultant carbonaceous materials (e.g. hardness, BET surface area, ash and elemental content, surface chemistry) were evaluated and compared with a commercial reference activated carbon (PICA F22). The adsorption capacity for phenol of the SBCMs was greater than suggested by their BET surface area, but less than F22; a steam activated, dewatered raw sludge (SA_DRAW) had the greatest adsorption capacity of the SBCMs in the investigated range of concentrations (<0.05 mol L?1). In batch oxidation tests, the SBCMs demonstrated catalytic behaviour arising from their substrate adsorptivity and metal content. Recycling of SA_DRAW in successive oxidations led to significant structural attrition and a hardened SA_DRAW was evaluated, but found to be unsatisfactory during the oxidation step. In a combined adsorption–oxidation sequence, both the PICA carbon and a selected SBCM showed deterioration in phenol adsorption after oxidative regeneration, but a steady state performance was reached after 2 or 3 cycles. |
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