Energy and Utilities Water and Wastewater Utilities 2

Question 1

What does 'BOD' stand for in wastewater treatment?

Accepted Answer

Biochemical Oxygen Demand

Answer

Biological Oxygen Demand

Answer

Basic Organic Discharge

Answer

Buffered Output Dosage

Question 2

What is 'primary treatment' in a conventional wastewater treatment plant?

Accepted Answer

Physical removal of settleable solids and floating material by screening and sedimentation

Answer

Biological degradation of organic matter

Answer

Chemical precipitation of phosphorus

Answer

Disinfection with UV or chlorine

Question 3

What does NPDES stand for in the context of US water regulation?

Accepted Answer

National Pollution Discharge Elimination System

Answer

Natural Processing of Dissolved Environmental Solids

Answer

National Primary Drinking water Enforcement Standard

Answer

Non-Point Discharge and Environmental Screening

Question 4

What is 'water loss' or 'non-revenue water' in distribution system management?

Accepted Answer

Water that enters the distribution system but is not billed to customers due to leaks, theft, or metering errors

Answer

Water used for fire suppression

Answer

Water reserved for drought emergencies

Answer

Water used in treatment plant operations

Question 5

What is the purpose of a 'water hammer' arrestor in plumbing systems?

Accepted Answer

Absorbing pressure surges from rapid valve closure to protect pipes

Answer

Preventing backflow contamination

Answer

Reducing water pressure at the meter

Answer

Filtering sediment from water

Question 6

What is 'digestion' in the biosolids treatment process at a wastewater plant?

Accepted Answer

Biological decomposition of organic matter in sludge to reduce volume and pathogens

Answer

Chemical treatment to neutralize pH

Answer

Mechanical dewatering of sludge

Answer

Blending sludge with disinfectants