Question: The following data have been obtained in a BOD test that is made to determine how well a wastewater treatment plant is operating: Initial DO

The following data have been obtained in a BOD test that is made to determine how well a wastewater treatment plant is operating:
Initial DO (mg/L) Final DO (mg/L) Vol of Wastewater (mL) Vol of Dilution Water (mL)
Untreated sewage 6 3 5 295
Treated sewage 9 5.5 15 285
What is the efficiency of the treatment plant in %?

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