Degradation of Organic Substances and Reactive Dye in an Immobilized-Cell Sequencing Batch Reactor Operation on Simulated Textile Wastewater

Abstract

Textile wastewater generally consists of high organic substances and is strongly colored. Reactive dye has been used extensively in the textile industries. It is water soluble and difficult to remove by chemical coagulation. Removal of organic substances simultaneously with dye can be achieved by a biological process. This study aims to investigate the treatability of the organic substances and reactive dye in immobilized-cell sequencing batch reactors (SBR). Three different supporting medias namely activated carbon, steel slag and plastic were used. The performance of each reactor was compared with a conventional sequencing batch reactor. The simulated textile wastewater containing the reactive azo dye Procion Red H-E7B of a concentration of 40 mg/L and COD 300 mg/L, was fed into the reactors. The supporting media in the SBR system, it will enhance the capability of COD and dye operating of the SBRs consisted of 5 periods; Fill 1.5 h, React (anoxic:oxic) 20 (14:6) h, Settle 1.5 h, Draw 0.5 h and Idle 0.5 h. The results revealed that by adding removal. During a steady state of operation, the COD and dye concentrations of each period were investigated. In addition, the prolonged anoxic period brought about better decolorization efficiency.

Methane production from anaerobic–aerobic sequential system treatment of azo dye Reactive Red 24

“…These results suggest that the 17 day was optimum SRT for the activity of microorganisms (see Figure 5). Similar studies [44,45] have obtained high COD removal efficiencies at the 12 and 15 day of SRT.…”

Effect of operating parameters on color and COD removal performance of SBR: Sludge age and initial dyestuff concentration

“…Similarly, better color and COD removal were observed at 15 days SRT compared to 10 days SRT in SBR [37]. Moreover, Pasukphan concluded that increasing sludge age from 12 to 22 days resulted in an increase of COD and color removal [41]. The results of this study indicated that at least 15 days sludge retention time is required for efficient decolorization of Remazol Rot RR and COD removal in SBR system.…”

“…Low initial COD concentration (500 mg l −1 ) and dyestuff concentrations (10 mg l −1 ) or longer anaerobic period (18 h) could be the main reasons for better COD removal compared to the results of this study. Over 80% COD removal in total of SBR was observed by Pasukphun and Vinitnantharat [41]. However, there are also reports about no efficient COD removal in anaerobic phase of SBR system.…”

“…The results are in good agreement with the other SBR studies. Increasing sludge age from 12 to 22 days did not provide better color removal [41]. Panswand reported around 70% color removal in anaerobic phase while it was maximum 12.8% aerobic phase of SBR system [39].…”

“…It is widely used in nutrient removal from wastewater by providing alternated anaerobic-aerobic-anoxic phases [33][34]. The application of SBR to color removal is rather a new approach compared to anaerobic-aerobic sequential treatment [35][36][37][38][39][40][41]. Therefore, effects of sludge age and initial dyestuff concentration on color and COD removal in facultative anaerobic bacterial culture containing SBR system were evaluated, in this study.…”