Both are critical, however, depending on the actual values (how high, salt mix and what organics is the COD) and the reuse application (process water, ,cooling towers, ,etc.), there may be more tolerance for one over the other. High TDS may lead to corrosion and scaling issues in cooling systems, however, anticorrosion and antiscalents programs can minimize impacts. COD will likely lead to biogrowth issues in process and cooling systems. However, if the high COD water is reused for land application farming, for example, the high COD can be tolerated and high TDS often cannot be tolerated. So, it depends....
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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.)