it depends on the composition ...
Published by Joseph Cotruvo, President at Joseph Cotruvo & Associates, Water , Environment and Public Health
it depends on the composition of the wastewater and what your discharge regulations require. In the US each plant has a discharge permit which determines what they must measure and what and how much they are allowed to discharge to a waterway. If it is an indirect discharge, to a municipal wastewater plant, then part of the permit is to protect the municipal wastewater plant from upsets due to excess TOC or nutrient or pH other things.