Thanks because of your comprehensive answer. In this investigation the purpose of industrial wastewater treatment is for consumption in industrial processes again. and the industries are diverse, so we need to produce a water for different industries. In this situation which parameter is more important? (In my opinion TDS is more important, because secondary treatment units can reduce the COD, not TDS. So TDS is more critical and the intention from establishment of an advanced treatment unit is to reduce the TDS.)

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Thanks because of your comprehensive answer. In this investigation the purpose of industrial wastewater treatment is for consumption in industrial processes again. and the industries are diverse, so we need to produce a water for different industries. In this situation which parameter is more important?

(In my opinion TDS is more important, because secondary treatment units can reduce the COD, not TDS. So TDS is more critical and the intention from establishment of an advanced treatment unit is to reduce the TDS.)