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A wastewater plant observes unusually high BOD5 levels in final effluent despite...

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A wastewater plant observes unusually high BOD5 levels in final effluent despite proper secondary treatment. What is the MOST likely explanation?

Pathogen concentrations are too low to consume oxygen.

0%

Influent contains high amounts of biodegradable organics from industrial discharge.

100%

Trickling filter was used instead of activated sludge.

0%

Secondary sludge is recirculated too quickly.

0%

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