title: Combined photo-assisted and biological treatment of industrial oily wastewater.
abstract: In the present study an oily wastewater from the lubricant unit of a petroleum company was evaluated by combining the sequence photo-assisted oxidation-Pseudomonas putida DSM 437. The wastewater contained various alcohols, acids and phenolic compounds. From the above mentioned compounds the biodegradation of ethylene glycol, phenol, o-cresol and p-cresol was examined. The direct biodegradation of the wastewater using P. putida DSM 437 resulted in 85% ethylene glycol assimilation while phenol, o-cresol and p-cresol assimilation was in the range of 27% to 40%. In order to increase the degradation of the phenolic compounds photo-assisted oxidation was applied to the wastewater using UV/ H2O2 its a pretreatment step to biological degradation. Fc(III) were used in order to accelerate the formation of the hydroxyl radicals and consequently the overall photo-oxidation process. The addition of Fe(III) ions resulted in 30% decrease of COD within the first 10 min while the respected value without iron ions was 5%. The combined photo-assisted oxidation and biodegradation of the wastewater resulted in 100% removal of ethylene glycol. The overall degradation of phenol was 78% while the 59% and 84% of the initial o-cresol and p-cresol respectively, were removed from the wastewater. The combined process resulted in 72% of COD removal.
authors.affiliation: Biotechnology Laboratory, School of Chemical Engineering, National Technical University of Athens, Zografou, Greece.
authors.forename: Diomi
authors.initials: D
authors.lastname: Mamma
authors.forename: Spiridon
authors.initials: S
authors.lastname: Gerontas
authors.forename: Constantine J
authors.initials: CJ
authors.lastname: Philippopoulos
authors.forename: Paul
authors.initials: P
authors.lastname: Christakopoulos
authors.forename: Basil J
authors.initials: BJ
authors.lastname: Macris
authors.forename: Dimitris
authors.initials: D
authors.lastname: Kekos
mesh_terms: D001673:Biodegradation, Environmental; D019149:Bioreactors; D003408:Cresols / Q000737:chemistry; D019855:Ethylene Glycol / Q000737:chemistry; D006801:Humans; D006861:Hydrogen Peroxide / Q000737:chemistry; D009821:Oils / Q000737:chemistry*; D010084:Oxidation-Reduction; D019800:Phenol / Q000737:chemistry; D016958:Pseudomonas putida / Q000378:metabolism*; D014466:Ultraviolet Rays; D014874:Water Pollutants, Chemical; D018508:Water Purification / Q000379:methods*
chemical_list: D003408:Cresols; D009821:Oils; D014874:Water Pollutants, Chemical; C032538:4-cresol; D019800:Phenol; D006861:Hydrogen Peroxide; D019855:Ethylene Glycol; C034047:2-cresol