Water Treatment ch 2 Flashcards
The energy crisis and water shortages are linked together
T or F
True
Both animal life and plant life depend of water for survival
T or F
True
Large cities may obtain their raw water supply from a stream or river into which the treated wastewater from an upstream city has been discharged
T or F
True
Laboratories can easily detect in water samples most of the new chemical that are developed each year
T or F
False
Acid rain is formed by the evaporation of acid waters from mine drainage
T or F
False
Precipitation is high in bacterial count
T or F
False
Color in water is objectionable mainly from the standpoint of health
T or F
False
The specific disease-producing organisms present in water are easily identified
T or F
False
Clear water is usually safe to drink
T or F
False
Running water usually purifies itself to drinking water quality within a reasonable distance
T or F
False
Sources of contamination of water supplies include
a) acid rain
b) industrial waste discharges
c) intrusion of seawater in groundwater basins
d) mineral residues from irrigation
e) salt from de-icing highways
a) acid rain
b) industrial waste discharges
c) intrusion of seawater in groundwater basins
d) mineral residues from irrigation
e) salt from de-icing highways
Sources of groundwater contamination include
a) agricultural drainage
b) seawater intrusion
c) seepage from septic tank leaching systems
d) seepage from improper disposal of hazardous wastes
e) surface runoff into wells
a) agricultural drainage
b) seawater intrusion
c) seepage from septic tank leaching systems
d) seepage from improper disposal of hazardous wastes
e) surface runoff into wells
The basic types of water rights are called
a) acquired
b) appropriative
c) beneficial
d) prescriptive
e) riparian
b) appropriative
d) prescriptive
e) riparian
For purposes of discussion, surface water supplies may be divided into which of the following classes?
a) artesian aquifers
b) lakes
c) reservoirs
d) rivers
e) wells
b) lakes
c) reservoirs
d) rivers
diseases that may be spread through a water supply include
a) chicken pox
b) dysentery
c) giardiasis
d) smallpox
e) typhoid fever
b) dysentery
c) giardiasis
e) typhoid fever
Typical uses of reclaimed water include
a) crop irrigation
b) drinking
c) industrial reuse
d) landscape impoundments
e) landscape irrigation
a) crop irrigation
c) industrial reuse
d) landscape impoundments
e) landscape irrigation
When conducting a sanitary survey, which of the following items would pertain to groundwater supply?
a) distance to sources of pollution
b) nature of soil
c) slope of ground surface
d) slope of water table
e) well construction
a) distance to sources of pollution
b) nature of soil
c) slope of ground surface
d) slope of water table
e) well construction
When conducting a sanitary survey, which of the following items would pertain to a water supply in a lake?
a) adequacy of supply as to quantity
b) algae growth potential
c) normal period of detention
d) protective measures in connection with watershed use
e) wind direction
a) adequacy of supply as to quantity
b) algae growth potential
c) normal period of detention
d) protective measures in connection with watershed use
e) wind direction
Items requiring protective measures in watersheds that serve as the source of a water supply include control of
a) disposal of drains
b) fishing
c) ice cutting
d) sanitary landfills
e) swimming
a) disposal of drains
b) fishing
c) ice cutting
d) sanitary landfills
e) swimming
Which types of substances may alter the quality of water as it moves over or below the surface of the earth?
a) biological
b) chemical
c) epidemiological
d) physical
e) radiological
a) biological
b) chemical
d) physical
e) radiological
Turbidity in water results from the presence of
a) finely divided organic material
b) hardness
c) pH
d) plankton
e) suspended material
a) finely divided organic material
d) plankton
e) suspended material
Most individuals find that water having a temperature between _____ is most palatable
a) 30 to 40 F
b) 40 to 50 F
c) 50 to 60 F
d) 60 to 70 F
e) 70 to 80 F
c) 50 to 60 F
The process by which water vapor is released to the atmosphere by living plants called
a) evaporation
b) hydrologic cycle
c) infiltration
d) precipitation
e) transportation
e) transportation
Water quality characteristics of surface water supplies include
a) absence of color
b) freedom from microbial contamination
c) high concentrations of dissolved gases
d) suspended solids
e) turbidity
d) suspended solids
e) turbidity
Lakes and reservoirs are susceptible to algal blooms when
a) maximum cloud cover occurs
b) optimum level of hardness is present
c) sufficient nutrients are available
d) temperature is right
e) water is completely stratified
c) sufficient nutrients are available
d) temperature is right
Sources of odors in drinking water include
a) dissolved oxygen
b) growths of algae
c) hydrogen sulfide
d) pH
e) temperature
b) growths of algae
c) hydrogen sulfide
A public water system according to Safe Drinking Water Act (SDWA) includes all public or privately owned systems that
a) are operated by a public agency
b) have at least 15 service connections
c) have at least 25 service connections which are used at least 60 days out of the year
d) serve an average of at least 15 people at least 60 days out of the year
e) serve an average of at least 25 people at least 60 days out of the year
b) have at least 15 service connections
e) serve an average of at least 25 people at least 60 days out of the year
The basic objectives in the operation of a water treatment plant include
a) keeping management happy
b) keeping regulatory agencies happy
c) production of safe drinking water
d) production of aesthetically pleasing drinking water
e) production of drinking water at a reasonable cost
c) production of safe drinking water
d) production of aesthetically pleasing drinking water
e) production of drinking water at a reasonable cost
Before the intake for a water supply is located in a river or stream, a careful study must be made of the:
a) degree of stream scour
b) hardness of the water
c) settling out of silt
d) stream bottom
e) water rights pertaining to site
a) degree of stream scour
c) settling out of silt
d) stream bottom
An amber color in water could indicate the presence of:
a) acid water from main drainage
b) algae in the water
c) boiler blow-off waters
d) humic substances
e) water from septic tanks
a) acid water from main drainage
d) humic substances
Determine the chlorinator setting in pounds per day of
Chlorinator feed rate, lbs/day:
(2 MGD)(3 mg/L)(8.43 lbs/gal)
a) 6 lbs/day
b) 16 lbs/day
c) 25 lbs/day
d) 36 lbs/day
e) 50 lbs/day
e) 50 lbs/day
Estimate the chlorine dose to a drinking water in mg/L if Chlorine Dose mg/L =
(14 lbs/day) / (.933 MGD)(8.34 lbs/gal)
a) 0.3 mg/L
b) 1.8 mg/L
c) 2.5 mg/L
d) 3.3 mg/L
e) 7.8 mg/L
b) 1.8 mg/L
