Coloured wastewater from a textile dyeing industry, located in
Punjab, India, was collected and characterized as per the Standard
Methods (APHA, 1995). Table 2 presents the composition of the
wastewater used in the study, which indicates that the wastewater
is highly alkaline with a high COD content. Based on an earlier study
using the RBC reactor system for treating synthetic wastewater
containing two model azo dyes (Pakshirajan et al., 2011), all
continuous experiments in the study to decolourize the industry
wastewater were performed at 6 rpm disc rotation speed, 48 h
hydraulic retention time (HRT). Initial pH of the wastewater was