title: Carbon and nitrogen removal from glucose-glycine melanoidins solution as a model of distillery wastewater by catalytic wet air oxidation.
abstract: Sugarcane molasses distillery wastewater contains melanoidins, which are dark brown recalcitrant nitrogenous polymer compounds. Studies were carried out in batch mode to evaluate Pt and Ru supported catalysts in the Catalytic Wet Air Oxidation (CWAO) process of a synthetic melanoidins solution, prepared by stoichiometric reaction of glucose with glycine. The addition of a catalyst slightly improved TOC removal compared with the non-catalytic reaction, and especially promoted the conversion of ammonium produced from organically-bound nitrogen in melanoidins to molecular nitrogen and nitrate. The selectivity to N2 attained 89% in the presence of the Pt catalysts in the reaction conditions used (TOC=2200mgL(-1), TN=280mgL(-1), 0.5g catalyst loaded with 3% metal, 210°C, 70bar total air pressure). To avoid leaching of the active metal by organically-bound nitrogen, the reaction was very efficiently performed in a two-step reaction consisting in WAO to convert nitrogen into ammonium, before the introduction of a catalyst.
authors.affiliation: IRCELYON, Institut de recherches sur la catalyse et l'environnement de Lyon, UMR5256 CNRS-Université Lyon 1, 2 Avenue Albert Einstein, F-69626 Villeurbanne Cedex, France.
authors.forename: Le
authors.initials: L
authors.lastname: Phuong Thu
authors.affiliation: IRCELYON, Institut de recherches sur la catalyse et l'environnement de Lyon, UMR5256 CNRS-Université Lyon 1, 2 Avenue Albert Einstein, F-69626 Villeurbanne Cedex, France. Electronic address: michele.besson@ircelyon.univ-lyon1.fr.
authors.forename: Besson
authors.initials: B
authors.lastname: Michèle
mesh_terms: D000388:Air; D000434:Alcoholic Beverages; D002244:Carbon / Q000737:chemistry*; D002384:Catalysis; D005947:Glucose / Q000737:chemistry*; D005998:Glycine / Q000737:chemistry*; D007220:Industrial Waste; D009584:Nitrogen / Q000737:chemistry*; D010084:Oxidation-Reduction; D010087:Oxides / Q000737:chemistry; D010984:Platinum / Q000737:chemistry; D011108:Polymers / Q000737:chemistry*; D012428:Ruthenium / Q000737:chemistry; D012996:Solutions; D014865:Waste Disposal, Fluid / Q000379:methods; D062065:Wastewater
chemical_list: D002244:Carbon; D005947:Glucose; D005998:Glycine; D007220:Industrial Waste; D009584:Nitrogen; D010087:Oxides; D010984:Platinum; D011108:Polymers; D012428:Ruthenium; D012996:Solutions; D062065:Wastewater; C011908:melanoidin polymers
keywords: Catalytic wet air oxidation; Distillery effluent; Melanoidins; Pt and Ru catalysts