Study of textile dyes and auxiliary substances concentration diminution process on pattern solutions and wastewater at their treatment in the cell with insoluble anods and their further oxidation
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2022-02-03 16:05
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GONTA, Maria, MATVEEVICI, Vera, MOCANU, Larisa, IAMBERTEV, Viorica. Study of textile dyes and auxiliary substances concentration diminution process on pattern solutions and wastewater at their treatment in the cell with insoluble anods and their further oxidation. In: The International Conference dedicated to the 55th anniversary from the foundation of the Institute of Chemistry of the Academy of Sciences of Moldova, 28-30 mai 2014, Chișinău. Chișinău, Republica Moldova: Institutul de Chimie al AȘM, 2014, p. 35.
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The International Conference dedicated to the 55th anniversary from the foundation of the Institute of Chemistry of the Academy of Sciences of Moldova 2014
Conferința "The International Conference dedicated to the 55th anniversary from the foundation of the Institute of Chemistry of the Academy of Sciences of Moldova"
Chișinău, Moldova, 28-30 mai 2014

Study of textile dyes and auxiliary substances concentration diminution process on pattern solutions and wastewater at their treatment in the cell with insoluble anods and their further oxidation


Pag. 35-35

Gonta Maria, Matveevici Vera, Mocanu Larisa, Iambertev Viorica
 
Moldova State University
 
 
Disponibil în IBN: 21 ianuarie 2019


Rezumat

The diminution process of the textile dye and auxiliary substances concentration was studied in laboratory conditions. There were modified different systems with such basic components of the wastewater as Active Orange (AO) and Direct Brown (DB) dyes, and Sodium Dodecyl Sulfate (SDS), Cetrimonium Bromide (CTBA) and ethylene glycol as auxiliary components. As a result of the electoflotation with electrolytic gases, the concentration of organic compounds is reduced. This step is followed by their oxidation by Fenton’s reagent or titanium oxide being irradiated by UV radiation at the wavelength of λ =365 nm. Finally, the remaining toxic components are adsorbed on activate carbon. The research showed that the diminution of the concentration of organic compounds from the studied systems depends on the electroflotation time. For example, for the system which contains DB and an anionic surfactant, increasing the electroflotation time from 5 to 15 minutes, the diminution efect rises from 79.2 to 94.4%. In the case with the system which contains AO and cationic surfactant, the diminution effect does not essentially depend on the electroflotation period of time, being around 74-76%. It can be observed that once the surfactants concentration for SDS and CTBA is increased from 20 to 60 mg/L, the diminution of the components concentration according to the period of eletroflotation for the AO-CTBA system is between 71-76% and the system DB-SDS shows a 94.4% diminution in comparison with initially 84.5% in just 15 minutes of electroflotation. The conclusion of this two examples described above is that if in the system is present a hydrophobic surfactant [1-3], the electroflotation effect and the mixture of dyes and surfactants elimination rises, and if in the system the hydrophilic polyalcohols are present, the electoflotation effect decreases. The concentration of degraded components is higher than the allowable limits after the photocatalytic oxidation, so it needs to be diminished. The activate carbon adsorbs a part of this substances, but the adsorption effect of the degraded compounds is lower than the initial ones which remain in the system even after electrofloculation. In conclusion, it can be said that the solutions which contain a mixture of active dyes as OA and surfactants can be treated combining the electrofloculation method with the adsorbtion on the activate carbon of the remaining components till a maximal allowable concentration is reached.