I would suggest that when ...

I would suggest that when this wastewater arises from ion exchange equipment regeneration involving acid and caustic soda, then the various pH sources can partially neutralize against each other, depending on how the various steps are controlled.  

If the sources come from say, wafer fabrication, it might not entirely make sense to combine these various streams from different aspects of the process, as some of them may require only minimal treatment prior to re-use, while others will need special treatment to remove toxic metals or fluoride.