California Wastewater Treatment Operator Practice Exam

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The organic loading to a trickle filter is expressed as?

  1. lbs BOD/hr/1,000ft³

  2. lbs TSS/day/1,000ft³

  3. lbs COD/day/1,000ft³

  4. lbs BOD/day/1,000ft³

The correct answer is: lbs BOD/day/1,000ft³

The organic loading for a trickle filter is typically measured in pounds of BOD (biochemical oxygen demand) per day per 1,000 cubic feet (ft³) of filter media. BOD is the amount of oxygen consumed by bacteria while decomposing organic matter and is a common measure of the strength of organic pollutants in wastewater. Therefore, options A, B, and C are incorrect because they all involve measures other than BOD and do not include a daily quantity. Option D, on the other hand, is the correct expression for the organic loading to a trickle filter.

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