Multi-stage Ozonation and Biological Treatment for Removal of Azo Dye Industrial Effluent

Abstract

In this study, decolourization and COD removal of Reactive Red 120, Remazol Brilliant Blue, Reactive Green 19 and Reactive Black 5 by ozonation and biological treatment were evaluated to apply for wastewater treatment containing azo dye. The performance of COD and colour removal in the single-stage ozonation-biological treatment was also compared with the multi-stage ozonation-biological treatment processes. Ozonation transforms the functional groups in azo dye to produce more biodegradable by products, which is easily removed by biological treatment. Ozonation is efficient for decolourization of Reactive Red 120, Remazol Brilliant Blue, Reactive Green 19 and Reactive Black 5 even with lower ozone dose (0.3 mg O 3 . mg dye -1 ). Contrarily, significant decreased in COD concentration was only observed within higher range of ozone doses (1.2 mg O 3 . mg dye -1 ). Higher COD removal at high ozone dose was due to complete oxidation of azo dye. The result indicated that biodegradable fraction of COD could be further oxidized and completely removed by ozonation. COD removal for Reactive Red 120 in the single stage ozonation-biological treatment and ozonation-biological treatment that repeated for 4 times were 58 % and 75 % respectively. The improvement of COD removal in the multi-stage ozonation-biological treatment was attributed to the production of biodegradable fraction of COD.

Sequential photo-Fenton and sono-photo-Fenton degradation studies of Reactive Black 5 (RB5)

“…sonophoto-Fenton and vice versa. Various literature studies depict the use of combined systems like physicochemical [22], ozone-biological [23], photochemicalbiological [24], photocatalysis [25], etc. for the treatment of dyes, but little attention has been paid on coupling ultrasound with other AOPs with sequential studies.…”

Determination of the Optimal Condition of Direct Blue Dye. Removal from Aqueous Solution Using Eggshell

“…R t % = 100 (C o -C t ) /C o (4) where: R t % percentage of dye removal at any time. According to experimental design of the four variables there was thirty one experiments .The model of design was the second-order polynomial response equation was used to make relation between the collected response and variables as in eq.…”

“…Wastewater pollution gives bad effects on public water supplies which can cause health problems such as diarrhea [3]. Major pollutants in textile wastewater are high acidity, heat and other soluble substances main pollution in textile wastewater came from dyeing and finishing processes [4,5]. Many treatment processes included physical, chemical, and biological have been employed to treat various municipal and industrial wastewaters for example chemical, biological, food, peanut hulls, maize bran, and others [6][7][8][9].…”

Adsorption and Thermodynamic Study of Direct Blue 71 Dye on to natural Flint Clay from Aqueous Solution

“…Wastewater pollution gives bad effects on public water supplies which can cause health problems such as diarrhea [3]. Major pollutants in textile wastewater are high acidity, heat and other soluble substances main pollution in textile wastewater came from dyeing and finishing processes [4][5].Many treatment processes included physical , chemical, and biological have been employed to treat various municipal and industrial wastewaters for example chemical [6].Biological, food [7]. Peanut hulls [8], maize bran [9].…”