CME CME Water & Wastewater Systems 2

Question 1

What is the purpose of a sanitary sewer system's lift (pump) station?

Accepted Answer

Pump wastewater to a higher elevation when gravity flow is not feasible

Answer

Remove grit and debris from sewage

Answer

Provide primary treatment of sewage

Answer

Control combined sewer overflow events

Question 2

Which treatment process removes the majority of suspended solids and biochemical oxygen demand (BOD) in secondary wastewater treatment?

Accepted Answer

Activated sludge or biological treatment

Answer

Screening and grit removal

Answer

Primary clarification

Answer

Chlorination and disinfection

Question 3

What document establishes the effluent limits a municipal wastewater treatment plant must meet when discharging to a water body?

Accepted Answer

NPDES Permit

Answer

MS4 Permit

Answer

TMDL Report

Answer

NOI for Construction

Question 4

In sewer system design, what does 'peaking factor' account for?

Accepted Answer

Ratio of peak instantaneous flow to average daily flow used for sizing sewers

Answer

Maximum pipe slope allowed

Answer

Infiltration/inflow from groundwater

Answer

Storm runoff contributing to combined sewers

Question 5

Which sewer rehabilitation method installs a resin-impregnated liner inside an existing pipe without excavation?

Accepted Answer

Cured-in-place pipe (CIPP)

Answer

Slip lining

Answer

Pipe bursting

Answer

Spray-on lining

Question 6

What is the primary concern with combined sewer overflows (CSOs) in older US cities?

Accepted Answer

Discharge of untreated sewage and stormwater to waterways during rain events

Answer

Excess potable water waste

Answer

Increased water pressure in distribution mains

Answer

Loss of chlorine residual in drinking water