An attractive agro-industrial by-product in environmental cleanup: Dye biosorption potential of untreated olive pomace

• Published in: Journal of hazardous materials Vol. 166; no. 2; pp. 1217 - 1225
• Main Authors: Akar, Tamer, Tosun, Ilknur, Kaynak, Zerrin, Ozkara, Esra, Yeni, Onur, Sahin, Esin N., Akar, Sibel Tunali
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier B.V 30-07-2009; Elsevier
• Subjects: Adsorption; Applied sciences; Biological and medical sciences; Biomass; Biosorption; Biotechnology; Coloring Agents - isolation & purification; Exact sciences and technology; Fundamental and applied biological sciences. Psychology; General purification processes; Hydrogen-Ion Concentration; Industrial Waste - economics; Industrial Waste - prevention & control; Isotherms; Methods. Procedures. Technologies; Naphthalenesulfonates - isolation & purification; Olea; Olea - chemistry; Olive waste; Osmolar Concentration; Others; Pollution; Reactive dye; Real wastewater; Thermodynamics; Triazines - isolation & purification; Various methods and equipments; Wastewaters; Water Pollutants, Chemical - isolation & purification; Water Purification - methods; Water treatment and pollution; Real wastewater; Biosorption; Olive waste; Isotherms; Reactive dye; Scanning electron microscopy; Second order; Reaction product; Biomass; Modeling; Waste water; Sorption; Oil industry; Kinetic model; Ionic strength; Aqueous medium; Solid waste; pH; Kinetics; Pretreatment; Waste water purification; Textile industry
• ISSN: 0304-3894; 1873-3336
• DOI: 10.1016/j.jhazmat.2008.12.029

This research deals with the evaluation of highly available and cost effective waste biomass of olive pomace for the removal of reactive textile dye, RR198 from aqueous medium and a real effluent. The experiments were conducted to assess the effects of process variables such as initial pH, biosorbent dosage, contact time, temperature and ionic strength. The results showed that the highest dye biosorption capacity was found at pH 2 and the needed time to reach the biosorption equilibrium was 40
min with a biosorbent concentration of 3.0
g
L
−1. The sorption kinetics of dye was best described by the pseudo-second-order kinetic model. The equilibrium biosorption data were analyzed by Langmuir, Freundlich and Dubinin–Radushkevich isotherm models and the results from the isotherm studies showed that the RR198 biosorption process occurred on a homogenous surface of the biosorbent. The waste biomass of olive oil industry displayed biosorption capacities ranging from 6.05
×
10
−5 to 1.08
×
10
−4
mol
g
−1 at different temperatures. The negative values of Δ
G° and the positive value of Δ
H° suggest that the biosorption process for RR198 was spontaneous and endothermic. Dye–biosorbent interactions were examined by FTIR and SEM analysis. Finally, high biosorption yield of olive waste for the removal of RR198 dye from real wastewater makes it possible that the olive pomace could be applied widely in wastewater treatment as biosorbent taking into account that no pretreatment on the solid residue is carried out.