Scientific Program

Day 2 :

Keynote Forum

Maria VISA

Professor, Transylvania University of Brasov, Romania

Keynote: Sustainable treatment of industrial wastewaters with complex composition by recycling fly ash

Time : 10:00 AM

Recycling 2017 International Conference Keynote Speaker Maria VISA photo

Prof. Maria graduated in chemistry and physics at University “Babes -Bolyai”, Romania. was manager at College of Natural Sciences “Emil Racovita”, Brasov. PhD. Diploma at Transilvania University on waste materials used for wastewater treatment. Vicepresident of Chemistry Society Romania, branch Brasov. Researcher on materials zeolites, fly ash used for removal dyes, heavy metals and surfactants from wastewater. Interculturale experience with Europen countries was developed on Erasmus and Comemius projects. 34 papers published in ISI journals with FI>2. (h index=11) in Adsorption, Catalysis Today, Applied Surface Science, Hazardous Materials Journals and 5 books and got more than 8 of awards given by National Authority for Scientific Research from Romania for the highly research in new materials obtained from fly ash. I participated in many International Conferences (WOCA, FOA10, the 10th International Conference on Fundamentals of Adsorption, 2010, 2011 Moscow, SPEA Palermo, Valentia 2012,2nd International Congress on Advanced Materials 2013,China,8th NANOSMAT, 2013,Granada 2013 Manchester UK, Urban Environmental Pollution Conference,2014,Toronto, Fall Meeting Warsaw and more. 


This work is focused on fly ash –material with adsorption properties used for advanced wastewater treatment, aiming at simultaneous removal of complex pollutant. There are gradually analysed substrates containing fly ash, modified fly ash by step–wise decreasing the alkali concentration down to 0.1N, alone or combined with natural adsorbents (bentonite, diatomite) and with photocatalysts (TiO2, WO3). Previous results were presented when using TiO2-photocatalyst and FA[1], and a comparative discussion is further developed in systems also containing WO3. Removal of pollutants like dyes with a complex structure (azo-, antrachinone, metal-complex dyes), heavy metals cations, surfactants from wastewater was investigated by adsorption and photodegradation onto a lot of substrates [2]. The materials obtained from FA and WO3, TiO2, used in removing pollutants from wastewater [2,3]. Materials zeolite obtained from FA are an excellent adsorbent for heavy metals [4]. New materials obtained from FA and surfactants as template were investigated for advance removal pollutants. The removal processes are investigated in dark (adsorption) and under UV illumination (adsorption + photocatalysis) in systems containing: (a) a single dye (Bemacid Blau; (b) one reactive dye or Bemacid Rot with Cu2+; (c) Mhetylen Bleu or Methyl Orange with Cu2+, Cd2+ and mixtures of two dyes (BB+BR) and Cu2+. Tests were done in batch experiments, under stirring.  The dye specific uptake by adsorption-photodegradation depends on the fly ash, the ratio FA-NaOH:TiO2, FA-NaOH:WO3, the dye type, the initial concentration of dye, the pH value in the system, the contact time, the mass of substrate. All these parameters are investigated and the optimised results are presented. The fly ash – wide band gap semiconductor systems develop two simultaneous processes: photodegradation and adsorption and the results are presented when treating wastewaters loaded with dyes, heavy metals, surfactants; the results show these combinations as a viable, low cost and up-scalable and sustainable technology.