Hi Imam, as other ...

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Hi Imam, as other contributors have stated, it depends on the requirements of the specific industries in the industrial park.  However you should also consider what industries are contributing the effluent to the advanced treatment unit.  E.g. if you have food related industries or an abattoir, the COD contribution to the treatment unit will be very high while the TDS contribution may be standard, while if you have metal industries contributing effluent the TDS in these effluents may be high.  So the effluent from the treatment unit may have either above standard COD or above standard TDS (also dependent on what processes you include in your advanced treatment unit.  But I imagine this is why you are asking the question  - you need to decide what unit processes to design for in the advanced treatment unit?

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thanks because of complete answer. let me add two. point. the aim of wastewater reuse is to give the water back for industries again and the industries are so various and are not limited to just a limit special group.

My personal opinion is that the TDS is more important. because we can reduce the COD in secondary treatment, but not TDS. and it is the main reason for designing advanced treatment unit (to reduce TDS).

So what is your answer now? TDS or COD

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As you have surmised the COD reduction is the basic step that will allow for either discharge or recycling, The TDS will matter depending on the application so that general washdown and toilet flushing will be fine but cooling and other duties may not be depending on the application and TDS level.

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