Browsing by Author "Iambarțev, Viorica"

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    ÎNLĂTURAREA AMESTECULUI DE COLORANŢI ŞI DISPERSANŢI DIN SOLUŢII PRIN APLICAREA METODELOR DE ELECTROFLOTOCOAGULARE ŞI ADSORBŢIE
    (CEP USM, 2016) Matveevici, Vera; Gonța, Maria; Mocanu, Larisa; Iambarțev, Viorica
    Cercetările de laborator au fost realizate pe sisteme model ce conţin coloranţi textili drept componenţi de bază, iar în calitate de compuşi auxiliari–agenţi de dispersie şi etilenglicol. În rezultatul cercetărilor ştiinţifice s-a constatat că efectul înlăturării amestecului de coloranţi şi dispersanţidin sistemele studiate depinde de dimensiunile şi sarcina particulelor de coloranţi, de natura şi concentraţia coloranţilor, dispersanţilor şi a polialcoolilor. De asemenea, epurarea apelor depinde de timpul de electroflotare şi de concentraţia ionilor de aluminiu.
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    NLĂTURA R EA COLORANTULUI PORTOCALIU ACTIV ȘI A ACIDUL UI 2, 2 - DIHIDROXIMETIL PROPIONIC PRIN METODE DE CONCENTRARE , LA PRIMA ETAPĂ , URMATE DE OXIDARE ŞI ADSORBŢIE
    (CEP USM, 2017) Gonța, Maria; Matveevici, Vera; Iambarțev, Viorica; Mocanu, Larisa; Duca, Gheorghe
    A fost studiat procesul de diminuare a concentrației emolientului , acidul 2,2-dihidroximetil propionic (DMPA),în prezența colorantului textil portocaliu activ (PA).S-a constatat că efectul înlăturării componenților din amestecul de colorant şi emolient se măreşte la aplicarea metodei de electroflotare sau electroflotocoagulare, iar la aplicarea metodei de coagulare efectul înlăturării se micșorează . La fel, s-a stabilitcă sistemele cu concentraţii mici de colorant PA (100,0 mg/l) şi molient 20,0-80,0 mg/L)se epurează prin combinarea metodei de electroflotocoagulare şi adsorbţie.Odată cu mărirea concentraţiei compuşilor organici, este necesară combinarea metodelor de electroflotocoagulare şi oxidare.
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    OXIDAREA CATALITICĂ CU APĂ OXIGENATĂ A COLORANTULUI PORTOCALIU ACTIV DIN SOLUŢIILE MODEL
    (CEP USM, 2008) Duca, Gheorghe; Matveevici, Vera; Gonța, Maria; Iambarțev, Viorica
    The processes of catalytic oxidation of textile colorant orange active (PA) wizh hydrogen peroxide were studied, indepemdence on the concentration of hydrogen peroxide, iron (II), initial concentration of colorant, with and withoutsubsequent boiling of model solutions. It was found that the effect of de-coloration and mineralization degree of colorant PA depends on concentration ofhydrogen peroxide and colorant. Maximal mineralization reached was 84-85%. In case of subsequent boiling of modelsolutions, following their catalitic oxidation, mineralization degree was increased reaching up to 97-98% in 5 minutes time
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    REMOVAL OF DIRECT DYES FROM TEXTILE WASTEWATER BY MEANS OF COMBINED METHODS
    (2009) Matveevici, Vera; Duca, Gheorghe; Gonța, Maria; Iambarțev, Viorica; Mocanu, Lilia
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    STUDIEREA PROCESULUI DE DIMINUARE A CONCENTRAŢIEI COLORANŢILOR DIRECŢI DIN SOLUŢIILE-MODEL PRIN APLICAREA METODELOR FIZICO-CHIMICE
    (CEP USM, 2011) Mateevici, Vera; Duca, Gheorghe; Gonța, Maria; Iambarțev, Viorica; Mocanu, Larisa
    The process of removal of textile coloring agents from model solutions by means of consecutive electrochemical andcatalytic oxidative treatment in the presence of hydrogen peroxide, and its dependence of the amount of electrochemical coagulant, initial concentration and properties of the coloring agent as well as the iron ions (II) content was discussed incurrent paper. The obtained results prove that the removal of reactive colorants through electrical generation of coagulants is more effective and economically sound when carried out from more concentrated model solutions of textile residual waters (the initial concentration should between 150-200 mg/l). The application of catalytic oxidation procedure can be applied in case of removal of reactive colorants of less concentrated solutions (the amount of colorants should not exceed 50 mg/l). From the acquired results it was identified that combined methods of electrochemical removal and catalytic oxidation by hydrogen peroxide of reactive colorants assure their effective removal from model solutions of residual waters containing up to 200 mg/l of mentioned colorants. The mineralization and residues content were reduced by 97-98%, while the consumption of coagulant was lower by a factor of 2-2.5 in comparison with conventional methods of treatment.