Wastewater Treatment Operator Class I Practice Questions - ABC WPI Wastewater Treatment Operator Class I Certification Exam

What does BOD5 measure in a wastewater sample?

The total inorganic solids in the sample The amount of dissolved chlorine remaining after disinfection The pH stability of the sample after five days The oxygen demand exerted by microorganisms as they consume biodegradable organic matter over five days

Correct Answer:

The oxygen demand exerted by microorganisms as they consume biodegradable organic matter over five days

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