Degradation of acid orange 7 by a controlled anaerobic–aerobic sequencing batch reactor

Abstract

The degradation of a mono azo dye in an automated and controlled anaerobic-aerobic sequencing batch reactor (SBR) is described in this work. The experiments were conducted with a synthetic wastewater containing acid orange 7 as the model compound to degrade and glucose as the co-substrate in a molar relationship 1:40 (substrate/co-substrate). It was possible to control the anaerobic and aerobic stages, using the redox potential (ORP) as the only control variable. The strategy detects an inflection point in the ORP signal, indicating the end of the reaction. The efficiency of removal of total organic carbon was between 85% and 90%. Azo dye was removed with 85% efficiency during the anaerobic stage.

Decolorization of Reactive Red 195 by a mixed culture in an alternating anaerobic–aerobic Sequencing Batch Reactor

“…Color was mainly removed under anaerobic conditions and residence time significantly affected system's performance. Treatment of a synthetic wastewater containing AO 7 was performed in an anaerobic-aerobic SBR [21]. Total organic carbon and color removal efficiency achieved were 85-90% and 85%, respectively.…”

Treatment of Mixed Azo Dyes in an Aerobic Sequential Batch Reactor and Toxicity Assessment Using Vigna radiata

“…e results obtained at a concentration of 100 mg/L were comparable to those reported by Shaw et al (2002) [26], who discovered that COD removal occurred at a rate of 70-80%. Tantak and Chaudhari (2006) [27] recorded 81.95, 85.57, and 77.83% COD in aerobic SBR after Fentons' oxidation. El-Gohary and Tawfik (2009) [28,29] reported 78% COD removal and 68.9% BOD removal in aerobic SBR after coagulation-flocculation at 6.35 h HRT.…”

Effect of Environmental and Operational Parameters on Sequential Batch Reactor Systems in Dye Degradation

“…The typical biological wastewater treatment methods such as activated sludge process, pure culture of decolorizer, oxidation ponds, aerated lagoons and sequencing batch reactors produces less sludge (Buitron, Martinez, & Vargas, 2006;Yu et al, 2015). Recently, the usage of SBR in dye containing wastewater treatment, has continuously receive attention from scientists because it is an efficient process for wastewater treatment.…”