title: Application of sludge-based carbonaceous materials in a hybrid water treatment process based on adsorption and catalytic wet air oxidation.
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.
authors.affiliation: Université de Toulouse, Laboratoire de Génie Chimique, UMR CNRS 5503, 4, allée Emile Monso, BP 84234, 31432 Toulouse Cedex 4, France. carine.julcour@ensiacet.fr
authors.forename: Carine
authors.initials: C
authors.lastname: Julcour Lebigue
authors.forename: Caroline
authors.initials: C
authors.lastname: Andriantsiferana
authors.lastname: N'Guessan Krou
authors.forename: Catherine
authors.initials: C
authors.lastname: Ayral
authors.forename: Elham
authors.initials: E
authors.lastname: Mohamed
authors.forename: Anne-Marie
authors.initials: AM
authors.lastname: Wilhelm
authors.forename: Henri
authors.initials: H
authors.lastname: Delmas
authors.forename: Laurence
authors.initials: L
authors.lastname: Le Coq
authors.forename: Claire
authors.initials: C
authors.lastname: Gerente
authors.forename: Karl M
authors.initials: KM
authors.lastname: Smith
authors.forename: Suangusa
authors.initials: S
authors.lastname: Pullket
authors.forename: Geoffrey D
authors.initials: GD
authors.lastname: Fowler
authors.forename: Nigel J D
authors.initials: NJ
authors.lastname: Graham
mesh_terms: D000327:Adsorption; D002384:Catalysis; D010084:Oxidation-Reduction; D019800:Phenol / Q000302:isolation & purification*; D012722:Sewage / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods*
chemical_list: D012722:Sewage; D014874:Water Pollutants, Chemical; D019800:Phenol