title: A comparative study of the treatment of ethylene plant spent caustic by neutralization and classical and advanced oxidation.
abstract: The treatment of spent caustic produced from an ethylene plant was investigated. In the case of neutralization alone it was found that the maximum removal of sulfide was at pH values below 5.5. The higher percentage removal of sulfides (99% at pH = 1.5) was accompanied with the highest COD removal (88%). For classical oxidation using H2O2 the maximum COD removal percentage reached 89% at pH = 2.5 and at a hydrogen peroxide concentration of 19 mM/L. For the advanced oxidation using Fenton's process it was found that the maximum COD removal of 96.5% was achieved at a hydrogen peroxide/ferrous sulfate ratio of (7:1).
authors.affiliation: Department of Civil and Architectural Engineering, College of Engineering, Qatar University, P.O. Box 2713, Qatar. Electronic address: a.hawari@qu.edu.qa.
authors.forename: Alaa
authors.initials: A
authors.lastname: Hawari
authors.affiliation: Environmental Engineering Master Program, College of Engineering, Qatar University, P.O. Box 2713, Qatar.
authors.forename: Hasanat
authors.initials: H
authors.lastname: Ramadan
authors.affiliation: Department of Chemical Engineering, College of Engineering, Qatar University, P.O. Box 2713, Qatar.
authors.forename: Ibrahim
authors.initials: I
authors.lastname: Abu-Reesh
authors.affiliation: Qatar Petrochemical Company (QAPCO), P.O. Box 756, Qatar.
authors.forename: Mabrouk
authors.initials: M
authors.lastname: Ouederni
mesh_terms: D002424:Caustics / Q000737:chemistry*; D005030:Ethylenes / Q000138:chemical synthesis*; D005296:Ferrous Compounds; D006861:Hydrogen Peroxide / Q000737:chemistry*; D007220:Industrial Waste / Q000032:analysis; D007501:Iron; D010084:Oxidation-Reduction; D012972:Sodium Hydroxide / Q000737:chemistry; D014865:Waste Disposal, Fluid / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000737:chemistry*
chemical_list: D002424:Caustics; D005030:Ethylenes; D005296:Ferrous Compounds; D007220:Industrial Waste; D014874:Water Pollutants, Chemical; C020748:ferrous sulfate; D012972:Sodium Hydroxide; C036216:ethylene; D006861:Hydrogen Peroxide; D007501:Iron
keywords: Advanced oxidation; Ethylene plant; Neutralization; Oxidation; Spent caustic