Colour removal of dyes from synthetic and real textile wastewaters in one- and two-stage anaerobic systems.

摘要: Abstract Decolourisation of the azo dye model compound, Congo Red (CR), and real textile wastewater, was assessed in one- two-stage anaerobic treatment systems (R 1 R 2 , respectively). High colour removals were achieved both even when a very high CR concentration (1.2 mM) applied. However, presented slightly better stability, which acidogenic reactor 2,A ) played major role on reduction, as compared to methanogenic M ), evidencing fermentative microorganisms. The minimum electron donor required sustain reduction much higher than stoichiometric amount. Additionally, decrease hydraulic retention time (from 24 12 h) did not significantly affect decolourisation, indicating that transfer concern. Finally, experiments with wastewater showed low decolourisation efficiencies systems, most likely due presence dyes susceptible reductive under these experimental conditions.