Treatment of olive mill waste water with activated carbons from agricultural by-products

• Published in: Waste Management
• Main Authors: Galiatsatou, P, Metaxas, M, Arapoglou, D, Kasselouri-Rigopoulou, V
• Format: Article in Journal/Newspaper
• Language: English
• Published: PERGAMON-ELSEVIER SCIENCE LTD 2002
• Subjects: Activated Carbon; Adsorption Isotherm; Chemical Oxygen Demand; Kinetics; Olive Mill Waste Water; Solvent Extraction; Surface Chemistry; Total Phenolics; Iodine Value; Engineering; Environmental; Environmental Sciences; Adsorption; Adsorption isotherms; Agricultural products; Carbonization; Microporosity; Phenols; Pulp; Solvent extracted olive pulp (SEOP); Wastewater treatment; adsorbent; carbonyl derivative; gallic acid; phenol; carbon; disinfectant agent; oxygen; food processing; wastewater; water treatment; agricultural waste; article; isotherm; model; olive; porosity; priority journal; surface property; waste water management; agriculture; chemistry; isolation and purification; methodology; olive tree; temperature; waste disposal; Disinfectants; Olea; Refuse Disposal; Support; Non-U.S. Gov't; Effluent Treatment; Extraction; Pulps; Solvents; Gadus morhua; Langmuir
• Online Access: http://dspace.lib.ntua.gr/handle/123456789/15019; https://doi.org/10.1016/S0956-053X(02)00055-7

A series of activated carbons prepared by a two-step steam activation of olive stone and solvent extracted olive pulp (SEOP) have been used in an attempt to investigate the total phenol removal and chemical oxygen demand (COD) decrease in olive mill waste water (OMWW). The temperature of carbonization and activation were kept constant at 850 and 800 degreesC, respectively. One of the carbons was prepared by a single-step process at 800 degreesC. Activated carbons have been characterized by adsorption of N-2 at 77 K and mercury porosimetry. Their iodine values were also determined. Surface oxides of activated carbons were determined using the Boehm's method. The porosity development and the surface chemistry of carbons were correlated to increasing removal ability of organic molecules. Kinetics of adsorption was evaluated by applying the Lagegren model while adsorption isotherm data were fitted to Langmuir model. Mesoporosity seems to be the key factor for total phenol removal while micoporosity controls the adsorption of total organics as expressed by the COD decrease in OMWW. For carbons with similar structure, the adsorption of phenols or total organics might be affected by the presence of carbonyls. (C) 2002 Elsevier Science Ltd. All rights reserved.