1.  A community's used water and water carried solids that flow to a treatment plant are
         called _________________ .

a.  Effluent b.  Wastewater c.  Mixed liquor d.  Sludge e.  None of these

2.  _________________ are waters that flow into a treatment plant:

a.  Storm waters b.  Wastewater c.  Groundwater infiltration d.  Surface runoff e.  Used water and solids from a community f.  All of the Above

3.  If there is enough water in the receiving stream to dilute the wastewater quickly, wastewater may be diverted directly to receiving waters without treatment.

a.  True b.  False

4.  Which diseases are spread by wastewater discharges?

a.  Cholera b.  Typhoid c.  Hepatitis d.  Dysentery e.  All of the Above

5.  What is the main difference between inorganic and organic wastes?

a.  Organic wastes contain carbon b.  Inorganic wastes are toxic to living organisms c.  Organic wastes are natural, inorganic wastes are manmade d.  Inorganic wastes include dead organisms e.  None of the above

6.  Scum is also called Detritus.

a.  True b.  False

7.  __________ bacteria obtain their oxygen by breaking down chemical compounds which contain oxygen, such as sulfate.

a.  Aerobic b.  Anaerobic

8.  The bacteria that will live and reproduce only in environments containing atmospheric oxygen or oxygen dissolved in water is called:

a.  Aerobic b.  Anaerobic

9.  An Imhoff cone measures:

a.  Organic solids b.  Total solids c.  Settleable solids d.  Colloidal solids e.  Dissolved solids

10.  Sludge digesters that are used today:

a.  Produce a gas that can be ued elsewhere in the plant b.  Are sealed tanks c.  Depend on the action of anaerobic bacteria d.  Require approximately 30 days to produce a properly digested sludge e.  All of the Above

11.  Grit is composed of:

a.  Floating woods and paper b.  Grease and scum c.  Plastics and rubber goods d.  Sand and eggshells e.  Sludge and organic materials

12.  What is Transpiration?

a.  The breathing of organisms b.  The cycle of water through its various forms in nature c.  The transfer of nutrients from soil to organisms d.  The release of water vapor to the atmosphere by living plants e.  The life/death cycles of plants and animals

13.  For disinfection purposes, chlorine is added to the ______________ effluent.

a.  Secondary clarifier b.  Sludge digester c.  Trickling filter d.  Rotating biological contactor e.  Aeration tank

14.  When wastewater remains in the collection system too long, what can develop?

a.  Odors b.  Corrosion of pipes and concrete structures c.  Production of hydrogen sulfide gas d.  All of the Above

15.  _____________ water flowing from a basin, treatment process, reservoir, or treatment
plant is called effluent.

a.  Raw b.  Partially treated c.  Treated d.  Untreated e.  All of the Above

16.  The treatment process designed to inactivate or kill disease-causing bacteria is called:

a.  Stabilization b.  Sterilization c.  Neutralization d.  Clarification e.  Disinfection

17.  A wastewater treatment plant may dispose of effluent by: 

a.  Discharging onto land b.  Evaporating into the atmosphere c.  Discharging into receiving waters d.  Reclaiming and reusing e.  Recharging groundwater f.  All of the Above

18.  Pretreatment takes place in the collection system before wastewater reaches the treatment plant.

a.  True b.  False

19.  When a problem develops in a mechanically cleaned screen, what should be done FIRST?

a.  Attempt to fix the screen with the proper tools b.  Find someone to help in case you get into trouble c.  Reach in with your hand and fix the equipment d.  Read the plant O&M manual to determine how to correct the problem e.  Turn off the electrical power to the screen, tag and lock out

20.  An aerated grit chamber detention time usually ranges from three to five minutes.

a.  True b.  False

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