Texas Wastewater Class B Practice Exam

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Prepare for the Texas Wastewater Class B Exam. Study with flashcards and multiple choice questions, each question accompanied by hints and explanations. Ace your exam!

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How long ago does the BOD test reflect the operation of the plant?

A day ago
2 days ago
5 days ago
7 days ago

The correct answer is: 5 days ago

The BOD (Biochemical Oxygen Demand) test measures the amount of oxygen that microorganisms will consume while decomposing organic matter in a water sample over a specific period, typically five days at 20 degrees Celsius. This period is standardized, meaning that the BOD test is indicative of the organic loading and operational effectiveness of the wastewater treatment plant as it was five days prior to the actual test. Therefore, the correct answer reflects the fact that BOD values show the conditions of the plant based on data collected five days earlier.