title: The removal of Direct Orange 39 by pulsed corona discharge from model wastewater.
abstract: Untreated wastewater from the dye industry and dyehouses cannot be directly discharged into the environment due to the high content of organic matter and intensive colouration, even with low concentrations of dye. In this paper, the application of a high voltage pulsed electrical discharge in the aqueous phase has been assessed for the dye degradation. Experiments were conducted in a batch reactor using model wastewater of the commercial water-soluble monoazo dye C.I. Direct Orange 39 (DO39). The effects of zeolite and ferrous sulphate in combination with the corona discharge were examined. Experiments were conducted for a range of process parameters including pH, conductivity, type and amount of zeolite, and ferrous sulphate concentration. A mathematical model to describe the kinetics of DO39 degradation in the corona reactor was developed. Aqueous phase pulsed streamer corona discharge as a method for coloured wastewater treatment showed very high effectiveness in the case of iron salt addition (Fenton's reaction). Low pH enhanced dye removal by corona in the absence of zeolite, thus implying that the acid properties of zeolites are important in dye degradation. Ecological parameters such as COD, TC, IC, TOC and IC50 measured before and after corona treatment showed that the treated wastewater can be discharged into the environment or reused as process water.
authors.affiliation: University of Zagreb, Faculty of Chemical Engineering and Technology, Marulicev trg 19, HR-10000 Zagreb, Croatia.
authors.forename: D
authors.initials: D
authors.lastname: Vujevic
authors.forename: N
authors.initials: N
authors.lastname: Koprivanac
authors.forename: A Loncaric
authors.initials: AL
authors.lastname: Bozic
authors.forename: B R
authors.initials: BR
authors.lastname: Locke
mesh_terms: D001391:Azo Compounds / Q000302:isolation & purification*; D004396:Coloring Agents / Q000302:isolation & purification*; D004563:Electrochemistry; D005296:Ferrous Compounds / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D007220:Industrial Waste; D013783:Textile Industry; D014865:Waste Disposal, Fluid / Q000379:methods*; D018508:Water Purification / Q000379:methods*; D017641:Zeolites / Q000737:chemistry
chemical_list: D001391:Azo Compounds; D004396:Coloring Agents; C493851:Direct Orange 39; D005296:Ferrous Compounds; D007220:Industrial Waste; D017641:Zeolites; C020748:ferrous sulfate