ABC Wastewater Treatment Grade 3 Exam | Practice Questions, Study Guide & Verified Answers

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ABC Wastewater Treatment Grade 3 Exam | Practice Questions, Study Guide & Verified Answers

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Institution Waste Water

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ABC Wastewater Treatment Grade 3 Exam | Practice Questions, Study Guide & Verified Answers

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ABC Wastewater Treatment
Grade 3 Exam | Practice
Questions, Study Guide &
Verified Answers
BOD incubation period and temperature - ANSWER-5 days at 20 C

Time to hold BOD sample in fridge - ANSWER-48 hours 4 C

What preservative do you add to store COD samples? - ANSWER-Sulfuric Acid
H2SO4

Ammonia incubation period and temperature - ANSWER-28 days at 4 C

What preservative do you add to store Ammonia - ANSWER-Sulfuric Acid H2SO4

Fecal Coliform holding time is - ANSWER-8 hours

A drip trap for an anaerobic digester does what - ANSWER-Removes condensate in
the gas piping system

, Chemical used to raise pH in a digester - ANSWER-Sodium bicarbonate or Lime

What causes the pH in an anaerobic digester to decrease - ANSWER-Increase in
volatile/alkalinity ratio

Heterotrophs feed on - ANSWER-Organic carbon

Autotrophs feed on - ANSWER-Inorganic carbon. They produce their own
nutrients.

Ensure accurate lab results through - ANSWER-duplicity

Which is larger, BOD or COD? - ANSWER-COD is larger

Phosphorous removal ratio of 300:5:1 - ANSWER-COD : Nitrogen : Phosphorous

Phosphorous removal ratio of 100:5:1 - ANSWER-BOD : Nitrogen : Phosphorous

Pump efficiency with 86% pump power and 86% motor functionality - ANSWER-
73.96%

First stage of an upset digester? - ANSWER-Volatile acids increase, alkalinity
decrease

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Uploaded on: April 11, 2026
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