Session 11 - Advanced oxidation processes

[CEST2019_00518] Degradation of Cylindrospermopsin using Advanced Non-Thermal Plasma Technologies
by Schneider M., Rataj R., Kolb J.F., Bláha L.

The application of non-thermal plasmas in wastewater and air purification received a lot of attention, but their potential application in drinking water treatment has scarcely been investigated. Classified as Advanced Oxidation Processes, plasmas ignited in water or at the air-water interface generate a vast range of reactive species capable of removing water contaminants.

Session: 11, Room: E, at Thu, 09/05/2019 - 12:00 to 12:15
Oral presentation in Advanced oxidation processes
[CEST2019_00497] Cavitation Based Advanced Oxidation Processes for Wastewater Treatment – Comparison of Hydrodynamic and Sonocavitation Systems
by Boczkaj G., Gągol M., Fedorov K., Cako E.

Cavitation based advanced oxidation processes (Cav-AOPs), are a promising alternative to currently used wastewater treatment technologies. Amplified interest in this “hot” topic results in increased number of research on several aspects relating to formation of cavitation phenomena and its utilization for wastewater treatment as well as hybrid processes based of application of external oxidants effectively converted to radical species in cavitation conditions.

Session: 11, Room: E, at Thu, 09/05/2019 - 11:45 to 12:00
Oral presentation in Advanced oxidation processes
[CEST2019_00350] Ozonation, advanced oxidation and hydrodynamic cavitation for removal of persistant pollutants
by Čehovin M., Žgajnar Gotvajn A.

Ozone is commonly used in advanced oxidation processes (AOPs) in combinations with hydrogen peroxide (H2O2) and UV radiation (UV). Hydrodynamic cavitation (HC) has been experimentally proven to result in effects, typical of AOPs. Combinations of AOPs with O3, H2O2 and UV, and HC (with cavitation numbers less than 0.2, generated by various orifice plates and nozzles, with number of passes up to 12) were experimentally assessed on model water, containing organic matter.

Session: 11, Room: E, at Thu, 09/05/2019 - 11:30 to 11:45
Oral presentation in Advanced oxidation processes
[CEST2019_00228] Evaluation of phytotoxic effects and decolorization of simulated and real textile wastewaters by UV/H2O2
by Quiceno L.I., Hernández M., Cardona L., Arroyave C., Aristizábal A.

In the present study textile dyes (Methylene Blue, Eliamine Blue F, Indigo) were used as model pollutants in water (ranging from 5 – 5000 mg/L) and real wastewater containing the Indigo dye was studied. The dyes in solution and the wastewater were treated by UV/H2O2 to study the influence of the type of dye, the initial concentrations of dye, the initial concentration of H2O2, the initial pH of the solution and the irradiation time in the dye decolorization of the treated solutions.

Session: 11, Room: E, at Thu, 09/05/2019 - 12:33 to 12:36
Flash presentation in Advanced oxidation processes
[CEST2019_00064] Effect of iron catalyst on caffeine oxidation by sono-Fenton technology
by Villota N., Sardón L., Ferreiro C., Lomas J.M., Camarero L.M.

Oxidation of waters containing 100.0 mg L-1 of caffeine was conducted by a sono-Fenton treatment employing an ultrasound power of 720W at pH=3.0 and T=25°C. The catalytic action of ferrous ion was studied in a range of [Fe2+]0=0-100.0 mg L-1, using oxidant ratios of [H2O2]0=250.0 mM. The oxidation of caffeine was fitted to second order kinetic model, with the oxidation kinetic constant showing a linear dependence with iron dosage. During oxidation, the water acquired yellow-brown colour, along with an increase of turbidity and aromaticity degree.

Session: 11, Room: E, at Thu, 09/05/2019 - 12:36 to 12:39
Flash presentation in Advanced oxidation processes
[CEST2019_00070] Effect of hydrogen peroxide on caffeine oxidation by sono-Fenton technology
by Villota N., Sardón L., Ferreiro C., Lomas J.M., Camarero L.M.

Oxidation of waters containing 100.0 mg L-1 of caffeine was conducted by a sono-Fenton treatment employing an ultrasound power of 720W at pH=3.0 and T=25°C. The oxidizing action of hydrogen peroxide was studied in a range between [H2O2]0=0-250.0 mM, using iron ratios of 0.7 mol Fe2+/mol C8H10N4O2. The oxidation of caffeine was fitted to second order kinetics, obtaining removals of 98% when dosing 485 mol H2O2/mol C8H10N4O2. During the oxidation, the water acquired a strong brown colour at the same time as there was a strong increase in turbidity and degree of aromaticity.

Session: 11, Room: E, at Thu, 09/05/2019 - 12:39 to 12:42
Flash presentation in Advanced oxidation processes
[CEST2019_00071] Changes of dissolved oxygen during the caffeine oxidation by photo-Fenton
by Villota N., Coralli I.,Lomas J.M.

The aim of this work is to analyse the changes of dissolved oxygen ([DO], mg/L) during the oxidation of caffeine waters by photo-Fenton treatment. The concentration of dosed hydrogen peroxide would be the addition of the stoichiometric [H2O2], which reacts with organic matter ([H2O2]esteq=2.0 mM), plus the concentration in excess of [H2O2]exc that decomposes, generating O2 through radical processes, according to a ratio R=0.8164 mmol H2O2/mg O2). Operating at doses lower than the stoichiometric value [H2O2]0<2.0 mM, O2 is not emitted, as there is no excessive oxidant.

Session: 11, Room: E, at Thu, 09/05/2019 - 12:15 to 12:30
Oral presentation in Advanced oxidation processes
[CEST2019_00079] Colour changes during the carbamazepine oxidation by photo-Fenton
by Villota N., Qullatein H., Lomas J.M.

Oxidation of waters containing 50.0 mg L-1 of carbamazepine was conducted by a photo-Fenton reagent employing a UV lamp of 150W, at pH=3.0 and T=40°C. The oxidising action of hydrogen peroxide was studied in a range between [H2O2]0=0-15.0 mM. When applying stoichiometric ratios of 2 mol C15H12N2O:20 mol H2O2:1.8 mol Fe2+, the maximum formation of colour (0.381 AU) is promoted.

Session: 11, Room: E, at Thu, 09/05/2019 - 12:42 to 12:45
Flash presentation in Advanced oxidation processes
[CEST2019_00014] Fenton reagent in combination with UV light and ultrasound waves applied for caffeine oxidation
by Villota N., Lomas J.M.

The oxidation of aqueous caffeine solutions ([Ca]0=100.0 mg L-1) was analyzed, operating at pH=3.0 and 25ºC using different AOPs, which combine the Fenton reagent ([H2O2]0=15.0 mM and [Fe2+]0=20.0 mg L-1) with low power UV light (15W,), medium (150W), and high (720 W). The Fenton reagent, combined with 150W UV light, was the most energetic treatment, proving that at 20 min it completely degrades caffeine and 80% of the water aromaticity.

Session: 11, Room: E, at Thu, 09/05/2019 - 12:30 to 12:33
Flash presentation in Advanced oxidation processes