Question: How can an operator determine that a plant's BOD removal efficiency has decreased from receiving water tests? Recalibrate testing instruments any time a DO decrease

How can an operator determine that a plant's BOD removal efficiency has decreased from receiving water tests?
Recalibrate testing instruments any time a DO decrease is recorded
Review all industrial discharges to the collection system for temperature increases and begin compliance actions against industrial users
Compare DO test results below the discharge line and upstream from the line for similar drops in receiving stream DO
Analyze past receiving water tests for trends in DO decreases over time
How can an operator determine that a plant's BOD

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