Integrated treatment of olive mill wastewater (OMW) by the combination of Fenton's reaction and anaerobic treatment

• Published in: Journal of hazardous materials Vol. 162; no. 2; pp. 1536 - 1541
• Main Authors: El-Gohary, F.A., Badawy, M.I., El-Khateeb, M.A., El-Kalliny, A.S.
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier B.V 15.03.2009; Elsevier
• Subjects: Anaerobic treatment; Anaerobiosis; Applied sciences; Biological and medical sciences; Biological treatment; Catalysis; Catalytic reactions; Characterization; Chemical engineering; Chemical treatment; Chemistry; Exact sciences and technology; Food engineering; Food industries; Food Industry; Fundamental and applied biological sciences. Psychology; General and physical chemistry; General aspects; General purification processes; Hydrogen-Ion Concentration; Industrial Waste; Olea; Olive mill waste; Olive Oil; Plant Oils; Pollution; Reactors; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry; Wastewaters; Water Pollutants; Water treatment and pollution; Wet hydrogen peroxide catalytic oxidation; Characterization; Olive mill waste; Biological treatment; Chemical treatment; Wet hydrogen peroxide catalytic oxidation; Anaerobic treatment; Hydrogen peroxide; Waste treatment; HPLC chromatography; Upflow anaerobic sludge blanket reactor; Retention time; Waste water; Biological purification; Anaerobe; Chemical oxygen demand; Food industry; pH; Fenton reaction; Oxidation; Catalytic reaction; Grease; Upward flow; Operating conditions; Bioreactor; Water quality; Phenols
• ISSN: 0304-3894; 1873-3336
• DOI: 10.1016/j.jhazmat.2008.06.098

The use of an integrated treatment scheme consisting of wet hydrogen peroxide catalytic oxidation (WHPCO) followed by two-stage upflow anaerobic sludge blanket (UASB) reactor (10 l each) for the treatment of olive mill wastewater was the subject of this study. The diluted wastewater (1:1) was pre-treated using Fenton's reaction. Optimum operating conditions namely, pH, H 2O 2 dose, Fe +2, COD:H 2O 2 ratio and Fe +2:H 2O 2 ratio were determined. The UASB reactor was fed continuously with the pre-treated wastewater. The hydraulic retention time was kept constant at 48 h (24 h for each stage). The conventional parameters such as COD, BOD, TOC, TKN, TP, TSS, oil and grease, and total phenols were determined. The concentrations of polyphenolic compounds in raw wastewater and effluents of each treatment step were measured using HPLC. The results indicated a good quality final effluent. Residual concentrations of individual organic compounds ranged from 0.432 mg l −1 for ρ-hydroxy-benzaldhyde to 3.273 mg l −1 for cinnamic acid.