Decolorizing textile dye wastewater by anoxic/aerobic treatment

Abstract

A method of biologically decolorizing wastewater from fiber reactive dyeing of cotton by sequential anoxic/aerobic treatment steps using a single biomass has been developed and evaluated for chemical oxygen demand and color removal. A viable biomass that effectively removes both color and chemical oxygen demand in a sequential anoxic/aerobic treatment process has been developed. This method may be retrofitted to existing aerobic wastewater treatment systems that are typically used to treat dyeing wastewater.

Sequential Anaerobic-Aerobic Phase Strategy Using Microbial Granular Sludge for Textile Wastewater Treatment

“…The suitable contact time of anaerobic and aerobic reaction phases may provide high removal performance for the cleavage of the N=N bond (anaerobic condition) and mineralization of aromatic amines (aerobic phase). Furthermore, the reduction of COD is more effective during the aerobic stage as compared to the anaerobic reaction condition (Smith et al, 2007). It shows that having longer anaerobic (18 hours) and shorter aerobic (6 hours) react phase resulted in the highest removal for color and a slight improvement in the efficiency of COD removal.…”

Recycling and Reuse of Textile Effluent Sludge

“…The efficiency of this methodology relies on pH, temperature, waste loading, and the absence of oxygen and toxic materials. However, aerobic treatment of azo dye waste has been demonstrated to be inadequate by and large, yet it is regularly the commonplace technique for treatment utilised today (Smith et al 2007;Asia et al 2006). Aerated lagoons, activated sludge systems, and biological filters are among the aerobic systems used in secondary treatment.…”

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

“…However, because of the incomplete degradation 1369-703X/$ -see front matter © 2010 Elsevier B.V. All rights reserved. doi:10.1016/j.bej.2010.08.014 of the dyes molecules, some more dangerous compounds can be formed [12,13]. An aerobic phase can be effective in the complete degradation of the dye metabolites [14,15].…”