The performance of different activated carbons for the removal of nonionic surfactants from metallurgic wastewater was assessed through lab scale experiments. Two different matrices were used: a simple one, obtained by dissolving different amounts of a single nonionic surfactant (Triton X100) in distilled water, and a complex matrix, prepared as above but using surfactantsfree wastewater from an Italian metallurgic plant as solvent. In this way the main operative parameters that affect the adsorption process in the simple matrix have been studied avoiding the interference due to the complex matrix; then the results were utilized to define and optimize the tests carried out on the complex matrix. The adsorption equilibrium experimental data were best fitted with a Langmuir isotherm, allowing defining the contact time and the proper design parameters for the adsorption column. The different tests were performed on four different activated carbon types, and the removal efficiency and the treatment cycle duration for each of the tested carbons were discussed and compared. Theexperimental results showed that the saturation adsorption capacity is not notably correlated either with the pH value or with the water matrix, whereas the slope of the isotherm, defined by the Henry constant, is sensibly higher at strong acidic or alcaline conditions, with a minimum value at nearly neutral pH. Therefore, it was concluded that the removal efficiency is maximized when the operative pH was in the 2–4-unit value range. The best activated carbon, in terms of removal efficiency, resulted to be a mineral activated carbon, characterized by the highest iodine number, and thus with the largest porosity. Removal efficiencies were in the 60 to 80% range.

Baciocchi, R., Lombardi, F., Torella, R. (2004). Activated carbons application to remove non ionic surfactants drom wastewater produced by an italian metallurgic plant. JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH. PART A, TOXIC/HAZARDOUS SUBSTANCES & ENVIRONMENTAL ENGINEERING, A39, 1095-1106.

Activated carbons application to remove non ionic surfactants drom wastewater produced by an italian metallurgic plant

BACIOCCHI, RENATO;LOMBARDI, FRANCESCO;
2004-01-01

Abstract

The performance of different activated carbons for the removal of nonionic surfactants from metallurgic wastewater was assessed through lab scale experiments. Two different matrices were used: a simple one, obtained by dissolving different amounts of a single nonionic surfactant (Triton X100) in distilled water, and a complex matrix, prepared as above but using surfactantsfree wastewater from an Italian metallurgic plant as solvent. In this way the main operative parameters that affect the adsorption process in the simple matrix have been studied avoiding the interference due to the complex matrix; then the results were utilized to define and optimize the tests carried out on the complex matrix. The adsorption equilibrium experimental data were best fitted with a Langmuir isotherm, allowing defining the contact time and the proper design parameters for the adsorption column. The different tests were performed on four different activated carbon types, and the removal efficiency and the treatment cycle duration for each of the tested carbons were discussed and compared. Theexperimental results showed that the saturation adsorption capacity is not notably correlated either with the pH value or with the water matrix, whereas the slope of the isotherm, defined by the Henry constant, is sensibly higher at strong acidic or alcaline conditions, with a minimum value at nearly neutral pH. Therefore, it was concluded that the removal efficiency is maximized when the operative pH was in the 2–4-unit value range. The best activated carbon, in terms of removal efficiency, resulted to be a mineral activated carbon, characterized by the highest iodine number, and thus with the largest porosity. Removal efficiencies were in the 60 to 80% range.
Pubblicato
Rilevanza internazionale
Articolo
Sì, ma tipo non specificato
Settore ICAR/03 - Ingegneria Sanitaria-Ambientale
English
Con Impact Factor ISI
Nonionic surfactants; Industrial wastewater; Activated carbon; Adsorption; Metallurgic plant.
Baciocchi, R., Lombardi, F., Torella, R. (2004). Activated carbons application to remove non ionic surfactants drom wastewater produced by an italian metallurgic plant. JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH. PART A, TOXIC/HAZARDOUS SUBSTANCES & ENVIRONMENTAL ENGINEERING, A39, 1095-1106.
Baciocchi, R; Lombardi, F; Torella, R
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/31593
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