Biological assessment for degradation process of Direct Black 22 pre-oxidated by hydrogen peroxide and ozone

• Autorzy: Gutowska A. , Tosik R. , Jóźwiak W.K.
• Języki publikacji: EN

Abstrakty

EN

Application of hydrogen peroxide and ozone was investigated for degradation of azo dye Direct Black 22 in water solutions in concentration of 100 mg/dm3. Hydrogen peroxide was applied in the presence of ferrous ions in concentration of 5 mg/dm3 with 2.5 mg H2O2 per mg dye at pH = 3 and 40°C in a batch reactor. High degree of decolorization α > 98% was obtained under the optimal reaction conditions. Ozone was used in the barbotage reactor with a constant volume of solutions investigated at a continuous flow of 15 dm3/h ozone-oxygen mixture with 44 mg/dm3O3. Ozonation caused a nearly complete decolorization of dye α > 99.5% during 7 minutes of ozonation at ozone dose of 55 mg O3/dm3. The impact of dye solutions before and after oxidation by H2O2 and O3 on the activated sludge was investigated with the use of a special program EN ISO 8192. The program included inhibition I = (R(B)-R(T))/R(B) (R(B) and R(T) - the rates of oxygen consumption of blank and controlled samples). In the case of the investigated dye solutions, if the inhibition (I) had values significantly higher than 0.1 or lower than 0.1, the dye harmfully or advantageously influenced the activated sludge. Raw dye solution had inhibition I value < 0.1 and no negative effect on the activated sludge was recorded. Some positive impact appeared as a result of pre-oxidation by hydrogen peroxide because I values decreased, which had a positive stimulating effect. The ozonation had an increasing inhibition effect.

Słowa kluczowe

EN

hydrogen peroxide; ozone; azo dye; degradation; decolorization; activated sludge

PL

nadtlenek wodoru; ozon; barwnik azowy; degradacja; dekoloryzacja

• Wydawca: West Pomeranian University of Technology. Publishing House
• Czasopismo: Polish Journal of Chemical Technology
• Rocznik: 2006
• Tom: Vol. 8, nr 2
• Strony: 62--65
• Opis fizyczny: Bibliogr. 7 poz., rys., tab.

Twórcy

autor

Gutowska A.

autor

Tosik R.

autor

Jóźwiak W.K.

• Institute of General and Ecological Chemistry, Technical University of Łódź, ul. Żeromskiego 116, 90-924 Łódź,

Bibliografia

• (1) Tosik R., Wiktorowski S.: Color Removal and Improvement of Biodegradability of Wastewater from Dyes Production Using Ozone and Hydrogen Peroxide, Ozone Science and Engineering, 2001, 23, 295 - 302.
• (2) Tosik R.: Dyes Color Removal by Ozone and Hydrogen Peroxide: Some Aspects and Problems, Ozone Science and Engineering, 2005, 27, 265 - 271.
• (3) Tosik R., Gutowska A., Mitros M.: The Application of test inhibition of oxygen consumption by activated sludge for evaluation of selected azo-dyes degradated by hydrogen peroxide, Annals of the Polish Chemical Society, 2004, 3, 1128 - 1131.
• (4) Mitros M., Gutowska A., Tosik R., Jozwiak W. K.: Zastosowanie procesu Fentona do degradacji wybranych barwników organicznych, Monografie Komitetu Inżynierii Środowiska PAN, Lublin, 2005, 32, 845 - 853.
• (5) Barbusinski K.: Intensyfikacja procesu oczyszczania ściekow i stabilizacji osadów nadmiernych z wykorzystaniem odczynnika Fentona, Zeszyty Politechniki Śląskiej, 2004, 50, 12.
• (6) EN ISO 8192 Water quality - Test for the inhibition of oxygen consumption by activated sludge.
• (7) Li F., Fenglin Y., Weishen Y.: Performance of the decolorization of an azo dye with bipolar packed bed cell, Separation Purification Technology, 2004, 34, 89 - 96.