why sometimes natural bacterial consortia give a higher percentage of decolorization but have a lower COD removal rate
Awais Iqbal Bacterial decolorization is mostly dissimilatory, for instance azo dyes; is through breaking of the Azo N=N bond making the dye colorless. To lower the COD values you need assimilatory decolorization/mineralization where the dye is used as a carbon or nitrogen or both sources for growth. See
Article Biodecolourisation of Reactive Red 120 as a Sole Carbon Sour...
Where we use a consortium of bacteria to degrade the dye
Awais Iqbal Due to the complex dyes available in textile wastewater, the color of the effluent will be high and the degradation of COD level will be a bit lower, uptake of nutrients for the growth of the bacteria from the effluent will be a little slower than other effluents.
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